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The Most Probable Mechanism Function and Kinetic Parameters of Gibbsite Dissolution in NaOH 被引量:10
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作者 鲍丽 张廷安 +5 位作者 刘燕 豆志河 吕国志 王晓民 马佳 蒋孝丽 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2010年第4期630-634,共5页
Determination of probable mechanism function and kinetic parameters is important to hydrometallurgical kinetics.In this work,the most probable mechanism function and kinetic parameters of gibbsite dissolution in NaOH ... Determination of probable mechanism function and kinetic parameters is important to hydrometallurgical kinetics.In this work,the most probable mechanism function and kinetic parameters of gibbsite dissolution in NaOH solution are studied.The sample,the mixture of synthetic gibbsite and sodium hydroxide solution,was scanned in high-pressure differential scanning calorimetry(DSC) equipment with the heating rate of 10 K·min-1. Integral equation and differential equation of non-isothermal kinetics were solved to fit the data related to DSC curve.According to the calculation results,the most probable mechanism function for pure synthetic gibbsite dissolution in sodium hydroxide solution is presented based on the optimum procedure in the database of the mechanism function.The apparent activation energy obtained is(75±1) kJ·mol-1,the frequency factor is 10 8±1mol·s-1,and the reaction is a second order reaction. 展开更多
关键词 NAOH溶液 动力学参数 三水铝石 机理函数 溶解 氢氧化钠溶液 DSC曲线 微分积分方程
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E-pH diagram of ZnS-H_2O system during high pressure leaching of zinc sulfide 被引量:3
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作者 牟望重 张廷安 +5 位作者 刘燕 古岩 豆志河 吕国志 鲍丽 张伟光 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第10期2012-2019,共8页
The values of GΘ,EΘ or pH from 110 to 160℃ were calculated and the relevant potential expressions were obtained.E-pH diagrams of ZnS-H2O system at oxygen partial pressure of 0.8 MPa,ionic activity of 1.0 and differ... The values of GΘ,EΘ or pH from 110 to 160℃ were calculated and the relevant potential expressions were obtained.E-pH diagrams of ZnS-H2O system at oxygen partial pressure of 0.8 MPa,ionic activity of 1.0 and different temperatures were drawn through thermodynamical calculation.With the temperature increasing,the stable regions of S and Zn(Ⅱ) in the E-pH diagrams become gradually larger,but the amplification decreases over 150℃.The impacts of leaching parameters,such as temperature,liquid to solid ratio,initial acidic concentration,leaching time,oxygen partial pressure and stirring speed on the leaching rate of Zn(Ⅱ) and conversion rate of S in the single factor of high pressure leaching experiment of ZnS in autoclave,were studied.The leaching residue was examined by X-ray fluorescence(XRF) chemical composition identification and X-ray diffraction(XRD) phase identification,and the content of the leaching solution was tested by inductively coupled plasma-atomic emission spectrometry(ICP).The experimental results indicate that the leaching rate of zinc increases from 60.05% to 97.85% and the conversion rate of sulfur increases from 38.90% to 80.92% with the temperature increasing from 110℃ to 150℃,5:1 of liquid-to-solid ratio,150 g/L of initial acidic concentration,120 min of leaching time,0.8 MPa of oxygen partial pressure,and 480 r/min of stirring speed,which tend to be stable over 150℃.The experimental results correspond with theoretical calculation. 展开更多
关键词 高压浸出 硫化锌 电感耦合等离子体原子发射光谱 pH图 H2O 热力学计算 电子 X射线衍射仪
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Pressure acid leaching of zinc sulfide concentrate 被引量:4
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作者 古岩 张廷安 +4 位作者 刘燕 牟望重 张伟光 豆志河 蒋孝丽 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第S1期136-140,共5页
Effects of particle size of the zinc sulfide concentrate,leaching temperature,solid-to-liquid ratio and additive amount on pressure acid leaching process of the zinc sulfide concentrate were studied.The results indica... Effects of particle size of the zinc sulfide concentrate,leaching temperature,solid-to-liquid ratio and additive amount on pressure acid leaching process of the zinc sulfide concentrate were studied.The results indicate that the additive can improve the reaction kinetics and the conversion rate.And sulfur can be successfully separated from the zinc sulfide concentrate as elemental sulfur.The reasonable experiment parameters are obtained as follows:the leaching temperature 150℃,oxygen partial pressure 1 MPa,additive amount 1%,solid-to-liquid ratio 1:4,leaching time 2 h,initial sulfuric acid concentration 15%,and particle size less than 44μm.Under the optimum conditions,the leaching rate of the zinc can reach 95%and the reduction rate of the sulfur can reach 90%. 展开更多
关键词 zinc sulfide concentrate pressure acid leaching ZINC SULFUR
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Numerical Simulation of Enhanced Oil-Water Separation in a Three-Stage Double-Stirring Extraction Tank 被引量:3
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作者 Lü Chao Zhang Zimu +3 位作者 Zhao Qiuyue Wang Shuchan Zhang Ting'an Liu Yan 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2015年第4期121-126,共6页
Numerical simulation of enhanced fluid flow characteristics in a three-stage double-stirring extraction tank was conducted with the coupling of an Eulerian multiphase flow model and a Morsi-Alexander interphase drag f... Numerical simulation of enhanced fluid flow characteristics in a three-stage double-stirring extraction tank was conducted with the coupling of an Eulerian multiphase flow model and a Morsi-Alexander interphase drag force model. Results show that the addition of a stirring device into the settler can efficiently reduce the volume fraction of out-of-phase impurity in the outlet, and accelerate the settling separation of oil-water mixture. Such addition can also effectively break down the oil-water-wrapped liquid droplets coming from the mixer, inhibit reflux from the outlet, and improve the oil-water separation. The addition of a stirring device induces ignorable power consumption compared with that by the mixer, and can thus facilitate the commercialized promotion of this novel equipment. 展开更多
关键词 油水分离 搅拌装置 数值模拟 萃取槽 强化 多相流模型 油水混合物 流动特性
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碳酸钠分解水化石榴石的非等温动力学研究(英文) 被引量:1
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作者 朱小峰 张廷安 +4 位作者 王艳秀 吕国志 张伟光 王聪 赵爱春 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第10期1634-1639,共6页
Carbonation decomposition of hydrogarnet is a significant reaction of the calcification-carbonation new method for alumina production by using low-grade bauxite.In this work,non-isothermal decomposition kinetics of hy... Carbonation decomposition of hydrogarnet is a significant reaction of the calcification-carbonation new method for alumina production by using low-grade bauxite.In this work,non-isothermal decomposition kinetics of hydrogarnet in sodium carbonate solution was studied by high-pressure differential scanning calorimetry(HPDSC) at different heating rates of 2,5,8,10,15 and 20 K·min^(-1),respectively.The activation energy(E_α) was calculated with the help of isoconversional method(model-free),and the reaction mechanism was determined by the differential equation method.The calculated activation energy of this reaction was 115.66 kJ·mol^(-1).Furthermore,the mechanism for decomposition reaction is Avrami-Erofeev(n=1.5),and the decomposition process is diffusion-controlled. 展开更多
关键词 水化石榴石 分解动力学 碳酸钠溶液 非等温 高压差示扫描量热法 反应机理 碳酸化分解 升温速率
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Effects of intense magnetic field on digestion and settling performances of bauxite 被引量:1
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作者 吕国志 张廷安 +4 位作者 王小晓 张旭华 刘燕 赵秋月 豆志河 《Journal of Central South University》 SCIE EI CAS 2014年第6期2168-2175,共8页
The effects of magnetic field intensity,roasting temperature and roasting time on digestion rate and settling performance of bauxite with different iron contents were investigated systematically.The results indicate t... The effects of magnetic field intensity,roasting temperature and roasting time on digestion rate and settling performance of bauxite with different iron contents were investigated systematically.The results indicate that such magnetic treatment can profoundly change the microstructure and digestion performance of bauxite.For the two samples carrying different iron contents,phase transformation of the aluminum oxide phase proceeds faster in the high iron bauxite than the low one.The optimal pretreatment conditions of low iron bauxite are roasting temperature 550 °C and magnetic field intensity 6 T,while for high iron bauxite are 500 °C and 9 T.The digestion rate of alumina can reach 95% and 92% at digestion temperature of 190 °C and 250 °C.The settling performances of roasted ore by intense magnetic field after digestion are enhanced through pretreatment. 展开更多
关键词 消化作用 铝土矿 强磁场 预处理条件 消化速度 磁场强度 焙烧温度 消化性能
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Direct spray pyrolysis of aluminum chloride solution for alumina preparation
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作者 吕国志 张廷安 +3 位作者 王龙 马思达 豆志河 刘燕 《Journal of Central South University》 SCIE EI CAS 2014年第12期4450-4455,共6页
The effects of pyrolysis mode and pyrolysis parameters on Cl content in alumina were investigated, and the alumina products were characterized by XRD, SEM and ASAP. The experimental results indicate that the spray pyr... The effects of pyrolysis mode and pyrolysis parameters on Cl content in alumina were investigated, and the alumina products were characterized by XRD, SEM and ASAP. The experimental results indicate that the spray pyrolysis efficiency is higher than that of static pyrolysis process, and the reaction and evaporation process lead to a multi-plot state of the alumina products by spray pyrolysis. Aluminum phase starts to transform into γ-Al2O3 at spray pyrolysis temperature of 600 °C, which is about 200 °C lower than that of static pyrolysis process. The primary particle size of γ-Al2O3 product is 27.62 nm, and Cl content in alumina products is 0.38% at 800 °C for 20 min. 展开更多
关键词 喷雾热分解 氧化铝 铝溶液 氯化 制备 热解参数 热解过程 蒸发过程
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Multistage desulfurization mechanism to reduce sulfur content of high ferrotitanium prepared using thermite method
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作者 Chu Cheng Zhi-He Dou +1 位作者 Ting-An Zhang Yu-Lai Song 《Rare Metals》 SCIE EI CAS CSCD 2021年第8期2313-2319,共7页
High ferrotitanium is used as a deoxidizer and alloying agent in steelmaking processes and is mainly produced using high-cost remelting processes.The thermite method is a simple and low-cost method for preparing low f... High ferrotitanium is used as a deoxidizer and alloying agent in steelmaking processes and is mainly produced using high-cost remelting processes.The thermite method is a simple and low-cost method for preparing low ferrotitanium.However,the high levels of S,Al,and O residues in the product severely restrict its applicability in the low-cost preparation of good-quality high ferrotitanium.In this study,a novel multistage deep reduction method for preparing high-quality high ferrotitanium is proposed,and the multistage desulfurization mechanism is systematically investigated.The results indicate that multistage desulfurization is an effective method for reducing the S content of high ferrotitanium prepared via the thermite method.During the strong desulfurization stage,Ti_(2)S reacts with CaO at the slag-metal interface and produces CaS.The S content decreases,while the O content increases,with the increase of CaO in the CaO-Al_(2)O_(3)-based slag.During the deep desulfurization,Ti_(2)S is deeply reduced by the Ca and produces CaS,thus further reducing the S content.The S content decreases with the incremental addition of Ca and can be reduced to 0.035 wt%after multistage desulfurization. 展开更多
关键词 Multistage desulfurization High ferrotitanium Thermite method Multistage reduction Deep reduction
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Cold Model Study on Mg Desulfurization of Hot Metal Under Mechanical Stirring 被引量:5
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作者 LIU Yan ZHANG Zi-mu +3 位作者 LIU Jian-nan ZHANG Jun-hua Masamichi Sano ZHANG Jun 《Journal of Iron and Steel Research(International)》 SCIE EI CAS CSCD 2013年第12期1-6,共6页
The new method of in-situ desulfurization with mechanical stirring of new type impellers was introduced, in which the bubble's dispersion and disintegration of magnesium vapor were the key to boosting the desulfuriza... The new method of in-situ desulfurization with mechanical stirring of new type impellers was introduced, in which the bubble's dispersion and disintegration of magnesium vapor were the key to boosting the desulfurization efficiency and increasing the utilization rate of magnesium. Effects of different new type of impellers on bubble dis persion and disintegration were studied through bubble image analysis, gas-liquid mass transfer, and power con- sumption levels of different impeller structures. The results showed that the sloped swept-back blade impeller-2 pro- duces optimal bubble's dispersion and disintegration, as well as higher volumetric mass transfer coefficient and CO2 gas utilization while consuming the least power. Numerical simulation result with Fluent software also showed that the sloped swept-back blade impeller-2 has higher turbulent kinetic energy and better velocity distribution than the other two impellers. 展开更多
关键词 gas injection refining eccentric mechanical stirring bubble disintegration bubble dispersion volumetric mass transfer coefficient Mg desulfurization hot metal
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Improvement of Impeller Blade Structure for Gas Injection Refining under Mechanical Sirring 被引量:4
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作者 Yan LIU Zi-mu ZHANG +3 位作者 Sano MASAMICHI Jun ZHANG Pin SHAO Ting-an ZHANG 《Journal of Iron and Steel Research(International)》 SCIE EI CAS CSCD 2014年第2期135-143,共9页
Abstract: The impeller blade structure for gas injection refining under mechanical stirring has been explored by water model experiments. A sloped swept-back blade impeller is'proposed for the purpose. The central p... Abstract: The impeller blade structure for gas injection refining under mechanical stirring has been explored by water model experiments. A sloped swept-back blade impeller is'proposed for the purpose. The central part of the impeller is disk- or plate-shaped, and the blades are fitted to the side of the disk or plate. In addition, a disk is put on the top side of the impeller blades. The impeller can strengthen the radial and downward flow between the blades and weaken the swirl flow in the zone above the impeller. These effects on flow phenomena are favorable for disintegration and wide dispersion of bubbles which are injected from a nozzle attached to the center of the underside of the impeller. In addition, the sloped swept-back impeller requires less power consumption. The impeller shaft should be placed away from the vessel center so as to disperse the injected bubbles widely in the bath under mechanical stirring even with unidi- rectional impeller rotation and without installing baffles. The number of gas holes in the nozzle and the direction of gas injection have a little effect on the bubble disintegration and dispersion in the bath. Highly efficient gas injection refining can be established under the conditions of proper impeller size, larger nozzle immersion depth, larger eccen- tricity and rotation speed of the impeller. The sloped swept back blade impeller can decrease the power consumption and vet improve the bubble disintegration and wide dist^ersion in the bath. 展开更多
关键词 gas injection refining cold model eccentric mechanical stirring impeller structure power consump-tion bubble disintegration bubble dispersion
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Sulfur distribution in preparation of high titanium ferroalloy by thermite method with different CaO additions 被引量:3
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作者 Chu Cheng Zhi-He Dou +4 位作者 Ting-An Zhang Jian-Ming Su Hui-Jie Zhang Yan Liu Li-Ping Niu 《Rare Metals》 SCIE EI CAS CSCD 2019年第8期793-799,共7页
Ferrotitanium is used as a deoxidizer and alloying agent during steelmaking process,which has a high demand for sulfur control.Sulfur was introduced from raw materials in the process of producing ferrotitanium by ther... Ferrotitanium is used as a deoxidizer and alloying agent during steelmaking process,which has a high demand for sulfur control.Sulfur was introduced from raw materials in the process of producing ferrotitanium by thermite method,where CaO was used as fluxing agent.At the same time,CaO has a great desulfurization capability.Effects of CaO addition on the distribution of sulfur in high titanium ferroalloy prepared by thermite method were studied in this work.The equilibrium diagram of Ti-AlFe-S system was calculated by FactSage 6.4 software package with FactPS and FTmisc database.The alloy and slag samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),inductively coupled plasma atomic emission spectrometer(ICP-AES),X-ray fluorescence(XRF)and high-frequency infrared ray carbon sulfur analyzer.The result indicates that the sulfur in the alloy firstly exists in the form of liquid FeS,thereafter TiS(s)and eventually Ti2 S(s)during cooling.The sulfur is mainly distributed in the alloy,and only a small amount of sulfur remains in the slag.Moreover,it is noted that the sulfur in the alloy does not distribute homogeneously,and it exists in the form of solid solution phase,(Ti,Al,Fe)S.S content in the slag,the sulfur capacity of the slag and the sulfur distribution ratio(LS)all increase with the increment of CaO addition,while S content in alloys decreases. 展开更多
关键词 DESULFURIZATION Sulfur partition ratio Optical BASICITY High titanium FERROALLOY THERMITE METHOD
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Pressure leaching of converter vanadium slag with waste titanium dioxide 被引量:3
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作者 Guo-Quan Zhang Ting-An Zhang +3 位作者 Ying Zhang Guo-Zhi Lv Yan Liu Zhuo-Lin Liu 《Rare Metals》 SCIE EI CAS CSCD 2016年第7期576-580,共5页
The process of pressure leaching the converter vanadium slag with waste titanium dioxide without roasting was studied. Mineralogy analysis indicates that the con- verter vanadium slag contains mainly three mineral pha... The process of pressure leaching the converter vanadium slag with waste titanium dioxide without roasting was studied. Mineralogy analysis indicates that the con- verter vanadium slag contains mainly three mineral phases: magnetite, titanium magnetite, and silicate phase. Vana- dium is in combination with iron, titanium, manganese, aluminum, and silicon. The impacts of leaching tempera- ture, leaching time, stirring speed, liquid-to-solid ratio, and initial leaching agent concentration were investigated on the waste titanium dioxide leaching process. The results indi- cate that under the optimal conditions, the vanadium and the iron leaching rates are 96.85 % and 93.50 %, respectively, and the content of titanium is 12.6 % in the residue. The main mineral phases for the residues under the optimal operation conditions are quartz, ilmenite, anatase, and sili- cate phase, and the residues can be reused as the extraction of titanium raw materials for titanium dioxide production technology by the sulfate method. 展开更多
关键词 VANADIUM Waste titanium dioxide Pressure leaching Resource utilization
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Oxygen content of high ferrotitanium prepared by thermite method with different melt separation temperatures 被引量:2
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作者 Chu Cheng Zhi-He Dou +4 位作者 Ting-An Zhang Jian-Ming Su Hui-Jie Zhang Yan Liu Li-Ping Niu 《Rare Metals》 SCIE EI CAS CSCD 2019年第9期892-898,共7页
High ferrotitanium prepared directly by the thermite method has a disadvantageously high O content(≥10 wt%)because of the short slag-metal separation time.In this study,CaO and CaF2 are added to the melt to improve t... High ferrotitanium prepared directly by the thermite method has a disadvantageously high O content(≥10 wt%)because of the short slag-metal separation time.In this study,CaO and CaF2 are added to the melt to improve the basicity of the slag and melt separation under heat preservation is performed to strengthen slag-metal separation.The thermodynamics of the step-by-step reduction process of TiO2 in the Ti-Al-Fe-Si-O system whose composition is close to the alloy after melt separation were calculated.Samples of alloys and slags before and after melt separation were systematically analyzed.The result indicates that the reaction that TiO is reduced by Al to Ti is the limited step in the reduction process of TiO2.The O content of the alloys slightly decreases with temperature from 1873 to 2023 K,which agrees with the changes in the law of deoxidation limit.It is mainly attributed to the movement of chemical reactions in the alloy melt at different temperatures and slag-metal interfacial reaction.The addition of Al2 O3-CaO-CaF2 slag and high temperature promote the removal of Al2 O3 and titanium suboxides.The minimum contents of O and Al in the alloy reach 1.84 wt% and 3.26 wt%,respectively. 展开更多
关键词 HIGH FERROTITANIUM OXYGEN content MELT SEPARATION Slag-metal SEPARATION THERMITE method
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Adsorption of Au(Ⅲ) ions on xanthated crosslinked chitosan resin in hydrochloric acid medium 被引量:3
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作者 Miao Zeng Ting-An Zhang +3 位作者 Guo-Zhi Lv Zhi-He Dou Yan Liu Ying Zhang 《Rare Metals》 SCIE EI CAS CSCD 2021年第3期743-748,共6页
Xanthated crosslinked chitosan(XCCS) resin prepared under microwave irradiation were used for adsorbing Au(Ⅲ) ions in hydrochloric acid medium.The influence of pH and temperature on the adsorption capacity of XCCS wa... Xanthated crosslinked chitosan(XCCS) resin prepared under microwave irradiation were used for adsorbing Au(Ⅲ) ions in hydrochloric acid medium.The influence of pH and temperature on the adsorption capacity of XCCS was investigated.The original XCCS and the loaded XCCS were characterized by scanning electron microscope(SEM) and X-ray diffraction(XRD),respectively.The results indicate that the XCCS has ability to adsorb Au(Ⅲ) ions and the maximum adsorption capacity of Au(Ⅲ) ions on XCCS is observed at pH 1 and 20℃.The data of batch adsorption tests are fitted to kinetic models and isotherm models,respectively.The kinetics of adsorption process is found to follow pseudo-second-order kinetic rate model,and equilibrium data agree very well with the Langmuir model.Thermodynamic calculation of the Au(Ⅲ) ions adsorption process indicates that the adsorption process is spontaneous and endothermic. 展开更多
关键词 Xanthated crosslinked chitosan ADSORPTION Au(Ⅲ)ions
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Numerical simulation:preparation of La_2O_3 in a jet pyrolysis reactor 被引量:1
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作者 Chao Lv Zi-Mu Zhang +3 位作者 Qiu-Yue Zhao Zhi-He Dou Ting-An Zhang Hong-Liang Zhao 《Rare Metals》 SCIE EI CAS CSCD 2015年第8期600-606,共7页
Based on the technique for preparing La Cl3 via direct pyrolysis of rare earth chloride solution, a jet pyrolysis reactor was designed and the intra-reactor temperature and chemical reactions were numerically simulate... Based on the technique for preparing La Cl3 via direct pyrolysis of rare earth chloride solution, a jet pyrolysis reactor was designed and the intra-reactor temperature and chemical reactions were numerically simulated using computational fluid dynamics(CFD) technique.The results show that the flow rate variation at the fuel inlet does not largely affect the temperature in the reactor, while the increase in external pressure at the material inlet rapidly decreases the average temperature, Venturi temperature, and outlet temperature. The CH4 and O2inside the reactor are combusted completely, and when the material inlet pressure is \90 Pa, the La Cl3 is fully pyrogenated. The contents of CO2, La2O3, and HCl fluctuate near the Venturi tube and finally stabilize. La2O3 content at the outlet is in a top-to-bottom gradient. 展开更多
关键词 Jet-flow PYROLYSIS Chemical reaction Numerical sim
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Effects of Roasting Pretreatment in Intense Magnetic Field on Phase Transition and Digestion Performance of Diasporic Bauxite
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作者 LV Guo-zhi ZHANG Ting-an +6 位作者 WANG Xiao-xiao ZHANG Xu-hua DU Juan LIU Yan DOU Zhi-he ZHAO Qiu-yue HE Ji-cheng 《Journal of Iron and Steel Research(International)》 SCIE EI CAS CSCD 2012年第S2期1034-1038,共5页
This paper investigates the changes of phase and apparent morphology under the combined effects of an intense magnetic field and temperature field.The effect of different roasting conditions on the digestion performan... This paper investigates the changes of phase and apparent morphology under the combined effects of an intense magnetic field and temperature field.The effect of different roasting conditions on the digestion performance of roasted ore is also studied.The results indicate that roasting pretreatment under high magnetic fields can change the microstructure and digestion performance of bauxite.The Al phase changed faster of high iron bauxite than that of low iron bauxite.The digestion performance of low iron bauxite improved significantly through roasting pretreatment in intense magnetic field. But the digestion performance of bauxite get worse with the iron content in bauxite increase,because the high iron content of bauxite lead the shielding effect of magnetic field and make the crystal structure of bauxite stably,the surface area or low iron bauxite increased obviously during pretreatment.The optimal pretreatment condition of low iron bauxite is roasting temperature of 550℃,roasting time of 60min and magnetic field intensity of 6T,while for the high iron is roasting temperature of 500℃,roasting time of 60min and magnetic field intensity of 9T. 展开更多
关键词 diasporic bauxite intense magnetic field phase transition digestion performance
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