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Uncertainty and disturbance estimator-based model predictive control for wet flue gas desulphurization system
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作者 Shan Liu Wenqi Zhong +2 位作者 Li Sun Xi Chen Rafal Madonski 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2024年第3期182-194,共13页
Wet flue gas desulphurization technology is widely used in the industrial process for its capability of efficient pollution removal.The desulphurization control system,however,is subjected to complex reaction mechanis... Wet flue gas desulphurization technology is widely used in the industrial process for its capability of efficient pollution removal.The desulphurization control system,however,is subjected to complex reaction mechanisms and severe disturbances,which make for it difficult to achieve certain practically relevant control goals including emission and economic performances as well as system robustness.To address these challenges,a new robust control scheme based on uncertainty and disturbance estimator(UDE)and model predictive control(MPC)is proposed in this paper.The UDE is used to estimate and dynamically compensate acting disturbances,whereas MPC is deployed for optimal feedback regulation of the resultant dynamics.By viewing the system nonlinearities and unknown dynamics as disturbances,the proposed control framework allows to locally treat the considered nonlinear plant as a linear one.The obtained simulation results confirm that the utilization of UDE makes the tracking error negligibly small,even in the presence of unmodeled dynamics.In the conducted comparison study,the introduced control scheme outperforms both the standard MPC and PID(proportional-integral-derivative)control strategies in terms of transient performance and robustness.Furthermore,the results reveal that a lowpass-filter time constant has a significant effect on the robustness and the convergence range of the tracking error. 展开更多
关键词 desulphurization system Disturbance rejection Model predictive control Uncertainty and disturbance estimator Nonlinear system
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Multiobjective economic model predictive control using utopia-tracking for the wet flue gas desulphurization system 被引量:1
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作者 Shan Liu Wenqi Zhong +2 位作者 Xi Chen Li Sun Lukuan Yang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2023年第2期343-352,共10页
Efficient control of the desulphurization system is challenging in maximizing the economic objective while reducing the SO_(2) emission concentration. The conventional optimization method is generally based on a hiera... Efficient control of the desulphurization system is challenging in maximizing the economic objective while reducing the SO_(2) emission concentration. The conventional optimization method is generally based on a hierarchical structure in which the upper optimization layer calculates the steady-state results and the lower control layer is responsible to drive the process to the target point. However, the conventional hierarchical structure does not take the economic performance of the dynamic tracking process into account. To this end, multi-objective economic model predictive control(MOEMPC) is introduced in this paper, which unifies the optimization and control layers in a single stage. The objective functions are formulated in terms of a dynamic horizon and to balance the stability and economic performance. In the MOEMPC scheme, economic performance and SO_(2) emission performance are guaranteed by tracking a set of utopia points during dynamic transitions. The terminal penalty function and stabilizing constraint conditions are designed to ensure the stability of the system. Finally, an optimized control method for the stable operation of the complex desulfurization system has been established. Simulation results demonstrate that MOEMPC is superior over another control strategy in terms of economic performance and emission reduction, especially when the desulphurization system suffers from frequent flue gas disturbances. 展开更多
关键词 desulphurization system Economics Economic model predictive control Flue gas Optimization Utopia point
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Research on flue gas desulphurization with two sorbents by water spray in activated reactor
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作者 赵长遂 吴树志 +3 位作者 刘现卓 吴新 陈晓平 段钰锋 《Journal of Southeast University(English Edition)》 EI CAS 2003年第4期355-358,共4页
The experimental results of flue gas desulphurization with caustic lime andhydrated lime activated by water spraying in a desulphurization reactor are presented. The effectsof Ca/S molar ratio, approach to saturation ... The experimental results of flue gas desulphurization with caustic lime andhydrated lime activated by water spraying in a desulphurization reactor are presented. The effectsof Ca/S molar ratio, approach to saturation of flue gas, SO_2 concentration and gas velocity onsulfur retention efficiency and calcium utilization rate are investigated. Desulphurizationcharacteristics of the two sorbents are compared. The mechanism of improving desulphurizationefficiency by water spraying is analyzed. The results show that the activities of two sorbents areimproved obviously by humidification with water spray and the caustic lime has better applicationprospect because of cheaper cost. 展开更多
关键词 desulphurization LIME water spray ACTIVATION
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Desulfurizer desulphurization kinetics by the injection method 被引量:1
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作者 Wei Wu Zhijun Han Yanbin Hu Wei Wu2 《Journal of University of Science and Technology Beijing》 CSCD 2008年第4期375-378,共4页
To obtain a better desulphurization effect in hot metal, suitable desulfurizers should be selected first according to thermodynamics. However, the effect of desulphurization is also strongly affected by kinetics. The ... To obtain a better desulphurization effect in hot metal, suitable desulfurizers should be selected first according to thermodynamics. However, the effect of desulphurization is also strongly affected by kinetics. The conditions of different desulfurizers (Mg, CaC2, and lime) penetrating into hot metal, the rising up velocity in iron melt, residence time, and dissolving time are theoretically calculated and analyzed. The results are helpful to select the desulphurization process and equipment and to improve the desulphurization effect. 展开更多
关键词 hot metal desulphurization desulphurization kinetics INJECTION
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Lignite oxidative desulphurization Notice 1.Process condition selection 被引量:8
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作者 Volodymyr Gunka Serhiy Pyshyev 《International Journal of Coal Science & Technology》 EI CAS 2014年第1期62-69,共8页
The process of lignite desulphurization via its treatment by an oxidant(air or air–steam mixture)has been studied.The research objective was useful determination of steam application in oxidative lignite desulphuriza... The process of lignite desulphurization via its treatment by an oxidant(air or air–steam mixture)has been studied.The research objective was useful determination of steam application in oxidative lignite desulphurization.It has been proved that the water steam should be included in the oxidant composition to increase the hydrogen sulphide and combustible constituent content in the gases obtained during the processes under research.The impact of factors which affect the reactions between solid(in our case–lignite)and gaseous reagent(oxidant,i.e.air and or air–steam mixture)upon the research process has been investigated,if these reactions occur in the kinetic area.Such factors are linear rate of oxidant movement and coal grain size.The values of oxidant movement linear rate and coal grain size,which the reaction transfer from pyrite sulphur and organic content of lignite from diffusion into kinetic area occurs by,have been determined.Under these‘‘transfer’’conditions,the values of coefficients of oxidant mass transfer(β,m/s)as well as Sherwood criteria and boiling layer differences have been calculated. 展开更多
关键词 LIGNITE Oxidative desulphurization PYRITE SULPHUR Hydrogen sulphide
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Effect of the surface properties of an activated coke on its desulphurization performance 被引量:10
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作者 ZHANG Xiang-lan ZHANG Yan DING Fang-sheng HUANG Qi-jiang LI Yuan 《Mining Science and Technology》 EI CAS 2009年第6期769-774,共6页
Commercial coke was modified by H2O2 and/or NH3.H2O to obtain an activated coke containing additional oxygen functional groups and/or nitrogen functional groups. The aim of the modification was to enhance the SO2 adso... Commercial coke was modified by H2O2 and/or NH3.H2O to obtain an activated coke containing additional oxygen functional groups and/or nitrogen functional groups. The aim of the modification was to enhance the SO2 adsorption capacity of the activated coke. Several techniques, including total nitrogen content measurements, SO2 adsorption, XPS and FTIR analysis, were used to characterize the coke samples. The XPS and FTIR spectra suggest the existence of -CONH2 groups in the H2O2 plus ammonia modified coke. The SO2 adsorption capacity of an activated coke increases slightly with an increase in H2O2 concentration during the modification process. The desulphurization performance of a modified coke is considerably enhanced by increasing the treatment temperature during ammonia modification. The amount of nitrogen in a coke modified by H2O2 plus NH3.H2O is the highest, and the SO2 adsorption capacity of the coke is also the highest (89.9 mg/gC). The NH3.H2O (only) modified sample has lower nitrogen content and lower desulphurization capacity (79.9 mg/gC). H2O modification gives the lowest SO2 adsorption capacity (28.9 mg/gC). The H2O2 pre-treatment is beneficial for the introduction of nitrogen onto the surface of a sample during the following ammonia treatment process. 展开更多
关键词 activated coke surface property desulphurization property
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Study of oxidative desulphurization process of coal with different metamorphism degrees 被引量:4
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作者 S PYSHYEV V GUNKA +2 位作者 Y PRYSIAZHNYI K SHEVCHUK A PATTEK-JANCZYK 《燃料化学学报》 EI CAS CSCD 北大核心 2012年第2期129-137,共9页
The oxidative desulphurization process of coal with different metamorphism degrees treated by an air-steam mixture has been studied.It has been shown that the pyrite present in black coal and anthracite is oxidized wi... The oxidative desulphurization process of coal with different metamorphism degrees treated by an air-steam mixture has been studied.It has been shown that the pyrite present in black coal and anthracite is oxidized with the sulphur dioxide formation,and the process chemical mechanism does not depend on the quality of organic matter.The medium-metamorphized coal,capable of turning into a plastic state and cake in the range of investigated temperatures(350~450 ℃),is desulphurized with the greatest difficulty.The chemical mechanism dealing with the transformations of pyritic sulphur present in brown coal differs from similar processes taking place in black coal and anthracite,because FeS2 is converted with hydrogen sulphide formation at desulphurization. 展开更多
关键词 oxidative desulphurization organic matrix PYRITE metamorphism degree SULPHUR
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Lignite oxidative desulphurization. Notice 2: effects of process parameters 被引量:4
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作者 Volodymyr Gunka Serhiy Pyshyevt 《International Journal of Coal Science & Technology》 EI 2015年第3期196-201,共6页
The influence of main characteristics upon conversion directions of the lignite organic part during its oxidation desulphurization was studied. The optimum temperature values, the ratio oxidant : raw material, and ti... The influence of main characteristics upon conversion directions of the lignite organic part during its oxidation desulphurization was studied. The optimum temperature values, the ratio oxidant : raw material, and time of coal stay in the reaction zone, which provide the maximum degree of sulphur conversion and hydrogen sulphide content in desulphur- ization gases, were calculated. The process implemented under these conditions will decrease environment pollution by sulphur dioxide during further lignite burning at least to 55 %-60 % and utilize sulphur in coal in the form of desul- phurization gases with hydrogen sulphide content of 7 %. Such obtaining sulphur. The effect of the above three factors on the depth was studied. gases can be reprocessed by the known methods of and character of the coal organic matter transformation 展开更多
关键词 LIGNITE Oxidative desulphurization PYRITE Sulphur in coal Hydrogen sulphide
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Desulphurization during VIM Refining Ni-base Superalloy using CaO Crucible 被引量:3
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作者 Jianping NIU, Kenu YANG, Tao JIN, Xiaofeng SUN, Hengrong GUAN and Zhuangqi HUInstitute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2003年第1期69-72,共4页
The variation of S content during VIM refining Ni-base superalloy using CaO crucible was studied. It was foundthat the desulphurization process could not be carried out by only using CaO crucible. The role of Al addit... The variation of S content during VIM refining Ni-base superalloy using CaO crucible was studied. It was foundthat the desulphurization process could not be carried out by only using CaO crucible. The role of Al additionto desulphurization was also studied. Combining with the results of XRD and composition analysis of the CaOcrucible, the mechanism of desulphurization was proposed. Thermodynamical calculation about the reaction betweenthe interface of CaO crucible and liquid metal has been discussed. This work indicated that under proper refiningtechnology the S content in the liquid Ni-base alloy could be reduced from 3×10-5 to 2×10-6~4×10-6. 展开更多
关键词 Ni-base superalloy CaO crucible VIM desulphurization
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Effects of Soluble Ions on Hydration of Calcined Flue Gas Desulphurization Gypsum 被引量:3
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作者 Fu-xing Lin Yan-chi Zhong +3 位作者 Shu-feng Yan Bi-fan Lin Jian-hua Wang Zhi-zhong Su 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2020年第6期764-768,I0003,共6页
The influence of various water soluble cations(K^+,Na^+,Ca^2+,Mg^2+)on the hydration of calcined flue gas desulphurization gypsum was investigated.The results show that all cations but Ca^2+can accelerate the hydratio... The influence of various water soluble cations(K^+,Na^+,Ca^2+,Mg^2+)on the hydration of calcined flue gas desulphurization gypsum was investigated.The results show that all cations but Ca^2+can accelerate the hydration of bassanite.The final crystal size is not largely influenced by different salts,except for Na^+,where the giant crystal with length of>130μm is observed.Current study clarifies the influence of different ions on the hydration of bassanite,which could provide sufficient guide for the pre-treatment of original flue gas desulphurization gypsum before actual application. 展开更多
关键词 BASSANITE Flue gas desulphurization HYDRATION Soluble ions
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Activation of Rejected Fly Ash Using Flue Gas Desulphurization (FGD) Sludge 被引量:2
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作者 乔秀臣 POONChisun LINZong-shou 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2003年第4期84-88,共5页
Low-grade fly ash (rejected fly ash,rFA),a significant portion of the pulverized fuel ash (PFA) produced from coal-fired power plants and rejected from the ash classifying process,remains unused due to its high carbon... Low-grade fly ash (rejected fly ash,rFA),a significant portion of the pulverized fuel ash (PFA) produced from coal-fired power plants and rejected from the ash classifying process,remains unused due to its high carbon content and large particle size (>45μm).But it is thought that the rejected ash may have potential uses in chemical stabilization/solidification (S/S) processes which need relatively lower strengths and a lower chemical reactivity.Flue Gas Desulphurisation (FGD) sludge is a by-product of air pollution control equipment in coal fired power plants whose chemical composition is mainly gypsum.As there is no effective usage of both of these two materials,it is of interest to research on the possible activation of rFA using FGD.This paper presents experimental results of a study on the properties of rFA activated by the FGD in rFA-cement pastes.Different percentages of FGD were added into the mix to study the effects of the FGD on the reaction of the rFA blended cement pastes.The results show that FGD takes effect as an activator only at late curing ages.Adding Ca(OH) 2 enhances the effect of FGD on activating the hydration of rFA.Also,10% FGD by weight of rFA is the optimal addition in the rFA-cement pastes.The results of the compressive strength measurements correlate well with the porosity results. 展开更多
关键词 rejected fly ash PFA strength development ACTIVATOR flue gas desulphurization sludge FGD
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Resource utilization of slag from desulphurization and slag skimming:A comprehensive recycling process of all components 被引量:2
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作者 Xiao Liu Peng Gao Yuexin Han 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2022年第3期585-593,共9页
In order to make the slag from desulphurization and slag skimming(SDSS)to be comprehensively recycled and utilized,a combined process of beneficiation and building materials preparation was proposed to recover iron fr... In order to make the slag from desulphurization and slag skimming(SDSS)to be comprehensively recycled and utilized,a combined process of beneficiation and building materials preparation was proposed to recover iron from SDSS,meanwhile to apply the remaining slag tailings as cement admixture.From this process,three iron-rich products were recovered in stages by clean gravity-magnetic separation,slag tailings were left.Slag powder was prepared by ultrafine grinding of slag tailings.The stability,setting time and cement mortar strength of the slag tailings cements(STC)which were mixed with Portland cement and slag powder were studied respectively.The results showed that a proper overall performance still could be obtained at the slag powder content of 30%.Chemical composition analysis,X-ray diffraction(XRD)analysis,metallographic microscope and scanning electron microscope(SEM)analysis were employed to assess the characteristics of the SDSS and the products obtained from the whole process.The results indicated that the three iron-rich products could be used as a raw material for steelmaking and ironmaking and the relatively large amount of calcium silicate(C_(2)S)and tricalcium silicate(C_(3)S)in the slag tailings make the addition of slag powder into the Portland cement feasible. 展开更多
关键词 desulphurization and slag skimming BENEFICIATION Iron-rich products Cement admixture Cementing property
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Research on the use of sintering flue gas desulphurization gypsum as a cement retarder 被引量:2
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作者 CHEN Ronghuan WANG Ruyi SHI Lei 《Baosteel Technical Research》 CAS 2010年第2期13-15,共3页
The characteristics of the desulphurized gypsum produced in the flue gas desulphurization (FGD) process of the Baosteel sintering plant are investigated in this study. According to the technical and quality requirem... The characteristics of the desulphurized gypsum produced in the flue gas desulphurization (FGD) process of the Baosteel sintering plant are investigated in this study. According to the technical and quality requirements of gypsum in the cement industry ,the feasibility of using desulphurized gypsum as a cement retarder is also studied. The results show that desulphurized gypsum can be used as a cement retarder instead of natural gypsum. 展开更多
关键词 SINTERING desulphurization gypsum cement retarder
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Vacuum Treatment for Simultaneous Desulphurization and Dephosphorization of Hot Metal and Molten Steel 被引量:1
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作者 WANG Hai-chuan WANG Shi-jun +2 位作者 ZHOU Yun WU Bao-guo DONG Yuan-chi 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2004年第2期14-17,共4页
The vacuum treatment for simultaneous desulphurization and dephosphorization of hot metal and molten steel with pre-melted CaO-based slag was carried out.For pre-treatment of hot metal,both desulphurization and dephos... The vacuum treatment for simultaneous desulphurization and dephosphorization of hot metal and molten steel with pre-melted CaO-based slag was carried out.For pre-treatment of hot metal,both desulphurization and dephosphorization are improved with the increase of CaO in slag,but deteriorated with the increase of CaF2 in slag.The average desulphurization and dephosphorization rate is 68.83 % and 78.46 %,respectively.For molten steel,the substitution of BaO for CaO in slag has minor effect on simultaneous desulphurization and dephosphorization.The desulphurization and dephosphorization rate is higher than 90% and 50% respectively with the lowest final sulfur and phosphorus mass percent being 0.001 2% and 0.010%,respectively.The overall effect of simultaneous desulphurization and dephosphorization of molten steel is better than that of hot metal. 展开更多
关键词 hot metal molten steel desulphurization DEPHOSPHORIZATION CaO-based slag vacuum treatment
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Lignite oxidative desulphurization: notice 3-process technological aspects and application of products 被引量:1
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作者 Volodymyr Gunka Mariia Shved +2 位作者 Yuriy Prysiazhnyi Serhiy Pyshyev Denis Miroshnichenko 《International Journal of Coal Science & Technology》 EI 2019年第1期63-73,共11页
The study reviews the process of oxidative desulphurization of high-sulphur Ukrainian lignite, which was performed by coal treatment using an air or air-steam mixture. In the process. sulphur-free fuel and tar from th... The study reviews the process of oxidative desulphurization of high-sulphur Ukrainian lignite, which was performed by coal treatment using an air or air-steam mixture. In the process. sulphur-free fuel and tar from the decomposition of coal organic matter was obtained. Hence, the sulphur in the coal was converted inlo hydrogen sulphide. The coal desulphurization process is critical to power generatio n. power generation and technology, and tech no logy field of application. The coal desulphurization process ensures the maximum recovery of the highest content of sulphur and hydrogen sulphide (H2S) in desulphurized gases at minimal energy costs. The process also enhances the maximum decomposition of tar and sulphur recovery (> 50%) during coal power generation. Based on smnniarized field studies, a block schematic diagram coupled with heat and material balances of the process was developed for the calculations. The application of the tech no logy at the first stage of coal combustion in thermal power plants will en able the utilizatio n of over 50% of recovered coal sulphur in the form of concentrated H2S or commercial elemental sulphur. This will, nevertheless, allow for a reduction of sulphur oxide pollution in the environment by at least 53%-56%. It has been suggested that the product of thermal decomposition of coal organic matter (tar) can be used as a componenl of fumace fuel oil or as a plasticizer of petroleum-based road bitumen. 展开更多
关键词 LIGNITE OXIDATIVE desulphurization SULPHUR Hydrogen SULPHIDE
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KINETICS OF DESULPHURIZATION IN PERMANENT CONTACT OF SLAG AND STEEL 被引量:1
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作者 JIANG Guochang XU Kuangdi DENG Jianxiong Shanghai University of Technology,Shanghai,ChinaGUO Zhancheng GUAN Yulong Beiiing University of Science and Technology,Beijing,China Jiang Guochang Associate Professor,The Institute of Metallurgy and Materials,Shanghai University of Technology,Shanghai 200072,China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1990年第10期252-257,共6页
The curve of % S vs reaction time is described quantitatively based on the electrochemical model directly deduced from the principle of electrochemistry as well as the given method for calculating the initial oxygen p... The curve of % S vs reaction time is described quantitatively based on the electrochemical model directly deduced from the principle of electrochemistry as well as the given method for calculating the initial oxygen potential along slag/steel interface.The calculated data is in good agreement with the experimental results. During desulphurization,both L_s~* and L_s,the sulphur partition along the interface and that in the bulk,go up in association with the descending of oxygen potential along interface. The plot of L_s~* against reaction time follows a parabolic curve,while that of L_s is of hyperbola type.Correspondingly,on curves of driving force parameter vs reaction tone,either calculated or experimental,a hump occurs. 展开更多
关键词 slag/steel interface desulphurization electrochemical model
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Deep Desulphurization and DeNO_X in Circulating Fluidized Bed Boiler 被引量:1
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作者 Zeng Tinghua, Zhan Zhigang Electric Power Research Institute of Guangdong Power Grid Corp. 《Electricity》 2011年第5期46-49,共4页
With the revision of emission standards, deep desulphurization and DeNO X is needed in circulating fluidized bed (CFB) boilers. The operation of the first set of 300-MW CFB boiler plus limestone/gypsum wet flue gas de... With the revision of emission standards, deep desulphurization and DeNO X is needed in circulating fluidized bed (CFB) boilers. The operation of the first set of 300-MW CFB boiler plus limestone/gypsum wet flue gas desulphurization (FGD) system in the world shows that deep desulphurization and DeNO X of CFB boilers has higher SO2 removal efficiency at a lower Ca/S ratio compared with traditional inner desulphurization mode. It can meet the increasingly rigid emission standards, and is suitable for more fuels. Deep desulphurization and DeNO X can also achieve a highly-efficient high-temperature CFB boiler that can not only achieve inner desulphurization and low NO X emission, but benefits low-grade, high sulfur content fuels as well. Research of deep desulphurization and DeNO X will be a developing direction for CFB boilers. 展开更多
关键词 CFB BOILER DEEP desulphurization DEEP DENOX FLUE gas desulphurization
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Adsorption of Pb^2+and Cu^2+with Unburned Desulphurization Slag Modified Nickel Slag 被引量:1
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作者 林亮 于岩 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2017年第3期491-502,共12页
Desulphurization slag modified nickel slag adsorbent was prepared by unburned forming technology. The structure of the sample was characterized by BET,XRD,IR,SEM and EDAX. The adsorption performance of Pb^2+ and Cu^2... Desulphurization slag modified nickel slag adsorbent was prepared by unburned forming technology. The structure of the sample was characterized by BET,XRD,IR,SEM and EDAX. The adsorption performance of Pb^2+ and Cu^2+ onto the resultant adsorbent from aqueous solution was studied. Results indicated that the adsorbent possesses a network pore structure formed by the AFt and C–S–H through cross lapping; the adsorbent contains a large number of Si–OH and Al–OH functional groups. The presence of functional groups not only provides abundant adsorption sites for Pb^2+ and Cu^2+,but also improves the adsorption performance of Pb^2+ and Cu^2+ from waste water through the complexation of heavy metal ions. The result of specific surface area analysis showed that the adsorbent sample possesses mesoporous structure and the BET specific surface area is 27.15 m^2/g. The solution p H values for the adsorption of Pb^2+ and Cu^2+ were optimized to be 6 and 5.5,respectively. The adsorption capacities of Pb^2+ and Cu^2+ gradually increase,whereas the removal rates of the two metal ions decrease with increasing the initial concentration of simulated solution. The resultant adsorbent gives a higher adsorption capacity for Cu^2+ than for Pb^2+ in the single ion solution. However,it shows preferential adsorption of Pb^2+ rather than that of Cu^2+. Meanwhile,results of recyclability indicate the remarkable regeneration capacity,re-adsorption ability and reusability performance of the adsorbent sample. 展开更多
关键词 desulphurization slag nickel slag adsorption lead ion copper ion
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Study on the Mechanism of Ultrasonically Enhanced Flotation Desulphurization
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作者 胡军 陈建启 雷灵琰 《International Journal of Mining Science and Technology》 SCIE EI 1999年第1期8-12,共5页
The mechanism of ultrasonic action and the influence of ultrasonic treatment on the changfs or particle size, dissolved oxygen, pH and the feasibility of flotation desul phurization with ultrasonic enhancement are stu... The mechanism of ultrasonic action and the influence of ultrasonic treatment on the changfs or particle size, dissolved oxygen, pH and the feasibility of flotation desul phurization with ultrasonic enhancement are studied. A new means of ultrasonic treatment for slurry is put forward. The test results indicate that by employing this means and an approprlate floatation technology and pyrite-depressed method, the optimum effect of rlotation desul phurization can be achieved. 展开更多
关键词 ULTRASONIC WAVE ULTRASONIC treatment floatation desulphurization PYRITE DEPRESSION
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The Ionization Theory of Desulphurization of the Panzhihua Blast Furnace Slag
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作者 魏寿昆 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1989年第5期313-318,共6页
With the proper choice of the ion species present in the Panzhihua blast furnace slag, the sulphur partition ratio was calculated based on the ionization theory of the slag. It can be concluded that TiO_2 reacts as an... With the proper choice of the ion species present in the Panzhihua blast furnace slag, the sulphur partition ratio was calculated based on the ionization theory of the slag. It can be concluded that TiO_2 reacts as an acidtc oxide and the Panzhihua ore or concentrate cannot be treated as a semi-self-fluxing ore. 展开更多
关键词 blast furnace slag desulphurization sulphur partition ratio
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