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淮钢大断面高碳钢圆坯保护渣的优化及应用 被引量:3
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作者 车从荣 陈伟 +2 位作者 金书淮 王建宇 戈强旺 《现代冶金》 CAS 2017年第6期37-40,共4页
分析了大断面高碳钢圆坯表面缺陷产生的原因,通过优化连铸保护渣,改善浇注性能,连铸坯表面缺陷得到有效控制。
关键词 高碳钢 保护 裂纹 高黏度
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宽板坯包晶钢保护渣操作优化 被引量:2
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作者 王向松 王飞日 《特钢技术》 CAS 2019年第4期43-46,共4页
宽板坯包晶钢生产过程,出现结晶器粘结漏钢、卷渣漏钢等事故,针对包晶钢保护渣使用过程出现的事故,结合该保护渣在结晶器表现性能,以及宽板坯结晶器流场分布特点,进行相应的操作技术优化。提高了包晶钢的生产稳定性,为钢种开发提供有效... 宽板坯包晶钢生产过程,出现结晶器粘结漏钢、卷渣漏钢等事故,针对包晶钢保护渣使用过程出现的事故,结合该保护渣在结晶器表现性能,以及宽板坯结晶器流场分布特点,进行相应的操作技术优化。提高了包晶钢的生产稳定性,为钢种开发提供有效支撑。 展开更多
关键词 包晶钢保护 粘结漏钢 漏钢
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压力管道的安全状况等级综合评定
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作者 方少鹏 《特种设备安全技术》 2013年第4期28-28,27,共2页
本文依据在用工业管道定期检验规则,对在使用中带局部减薄和条渣等缺陷的压力管道安全状况等级进行综合评定,用以确定压力管道下一检验周期。
关键词 局部减薄 条渣 综合评定
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Leaching of vanadium and chromium from converter vanadium slag intensified with surface wettability 被引量:8
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作者 YANG Qi-wen XIE Zhao-ming +2 位作者 PENG Hao LIU Zuo-hua TAO Chang-yuan 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第6期1317-1325,共9页
Technology intensified with surface wettability was introduced to leach vanadium and chromium from converter vanadium slag without roasting. Parameters affecting the leaching efficiency of vanadium and chromium were i... Technology intensified with surface wettability was introduced to leach vanadium and chromium from converter vanadium slag without roasting. Parameters affecting the leaching efficiency of vanadium and chromium were investigated: sulfuric acid concentration, MnOz-to-slag mass ratio, liquid-to-solid ratio, leaching time, leaching temperature, and sodium dodecyl sulfate (SDS)-to-slag mass ratio. The leaching efficiencies of vanadium and chromium were 33.46 % and 20.02 % higher in the presence of MnO2 and SDS, respectively, compared to the control. The leaching efficiencies of vanadium and chromium were 68.93 % and 30.74 %, respectively, under the optimum conditions: sulfuric acid concentration 40 wt%, MnOz-to-slag mass ratio 10.0 wt%, liquid-to-solid ratio 5:1 mL/g; 12 h; 90 ~C; and SDS-to-slag mass ratio 0.25 wt%. The analysis of the reaction mechanism in the leaching process indicates that MnO2 combined with protons (H+) could oxidize low-valent vanadium and chromium; SDS could change the chemical behavior and decrease the surface tension of the aqueous solution to favor MnO2 oxidization. 展开更多
关键词 VANADIUM CHROMIUM LEACHING SURFACTANT Mn02
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Optimization of processing parameters for microwave drying of selenium-rich slag using incremental improved back-propagation neural network and response surface methodology 被引量:4
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作者 李英伟 彭金辉 +2 位作者 梁贵安 李玮 张世敏 《Journal of Central South University》 SCIE EI CAS 2011年第5期1441-1447,共7页
In the non-linear microwave drying process, the incremental improved back-propagation (BP) neural network and response surface methodology (RSM) were used to build a predictive model of the combined effects of ind... In the non-linear microwave drying process, the incremental improved back-propagation (BP) neural network and response surface methodology (RSM) were used to build a predictive model of the combined effects of independent variables (the microwave power, the acting time and the rotational frequency) for microwave drying of selenium-rich slag. The optimum operating conditions obtained from the quadratic form of the RSM are: the microwave power of 14.97 kW, the acting time of 89.58 min, the rotational frequency of 10.94 Hz, and the temperature of 136.407 ℃. The relative dehydration rate of 97.1895% is obtained. Under the optimum operating conditions, the incremental improved BP neural network prediction model can predict the drying process results and different effects on the results of the independent variables. The verification experiments demonstrate the prediction accuracy of the network, and the mean squared error is 0.16. The optimized results indicate that RSM can optimize the experimental conditions within much more broad range by considering the combination of factors and the neural network model can predict the results effectively and provide the theoretical guidance for the follow-up production process. 展开更多
关键词 microwave drying response surface methodology optimization incremental improved back-propagation neural network PREDICTION
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Optimization of Solid State Fermentation Conditions Using a Mixture of Bean Curd Residue and Marc with Bacillus natto 被引量:2
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作者 ZHANG Hong LUO Yong-quan HUANG Zhi-bing XU Yang LIU Yu-fang 《Agricultural Science & Technology》 CAS 2011年第4期474-476,519,共4页
[Objective] The aim was to optimize the appropriate solid state fermentation(SSF)conditions.[Method] The optimization of solid state fermentation using a mixture substrate of bean curd residue and the marc with Bacill... [Objective] The aim was to optimize the appropriate solid state fermentation(SSF)conditions.[Method] The optimization of solid state fermentation using a mixture substrate of bean curd residue and the marc with Bacillus natto was developed.[Result] The best fermentation condition optimized by the test of single factor and the orthogonal design respectively was mixing ratio of bean curd residue to marc 2∶1,substrate pH value 6,fermentation temperature 39 ℃,inoculum volume 10% and fermentation time 48 h.Under this optimized fermentation condition,the content of crude fiber in the substrate decreased from 107.8 mg/g before SSF to 56.2 mg/g after SSF,and the degeneration rate of crude fiber was 47.87%.[Conclusion] The bean curd residue in its palatability was enormously improved by SSF with Bacillus natto strain,which could be expected to be widely used as raw material of health foodstuff. 展开更多
关键词 Bacillus natto Bean curd residue MARC Solid state fermentation
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Vanadium extraction and dephosphorization from V-bearing hot metal with fluxes containing CaO
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作者 王艳南 宋文臣 李宏 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第8期2887-2893,共7页
Extracting vanadium and removing phosphorus simultaneously by adding CaO containing materials to V-bearing hot metal were investigated under the condition of simulating the process of vanadium extraction with insuffic... Extracting vanadium and removing phosphorus simultaneously by adding CaO containing materials to V-bearing hot metal were investigated under the condition of simulating the process of vanadium extraction with insufficiently supplying oxygen in converter. Through preliminary experiments, 3 h and 1375 °C were chosen as the optimum holding time and reaction temperature for formal experiments, respectively. The results of the formal experiments suggest that making basic slag can extract vanadium and remove phosphorus simultaneously. The vanadium extraction rate(ηV) and phosphorus removal rate(ηP) both increase with an increase in the basicity of the original slag materials and the Fe2O3 contents. The vanadium distribution ratio)(V L′is about an order of magnitude greater than the phosphorus distribution ratio),(P L′but the latter is more sensitive to slag basicity than the former. The phosphorus distribution ratio is beyond 6 when the basicity of the original slag materials is beyond 1, which indicates a much better performance of phosphorus removal compared to the phosphorus removal in the current process. Therefore, it is very feasible to properly raise slag basicity to remove phosphorus with consideration of the grade of vanadium slag. The relations between ηV and ηP, and between L′V and L′P are linear under the experimental conditions. 展开更多
关键词 vanadium extraction phosphorus removal BASICITY vanadium distribution ratio phosphorus distribution ratio
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薄板坯连铸结晶器捞渣操作对漏钢的有效控制 被引量:4
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作者 杨学雨 郑立允 《连铸》 2021年第1期70-73,共4页
根据邯钢CSP薄板坯流程及结晶器的特点,分析了结晶器渣条的存在对黏结漏钢、夹渣漏钢、纵裂漏钢等形式漏钢的影响机理。结合结晶器液面、热流、保护渣种类、结晶器上口火焰翻腾情况、钢包烧眼、漏钢预报报警情况等众多工艺生产因素对渣... 根据邯钢CSP薄板坯流程及结晶器的特点,分析了结晶器渣条的存在对黏结漏钢、夹渣漏钢、纵裂漏钢等形式漏钢的影响机理。结合结晶器液面、热流、保护渣种类、结晶器上口火焰翻腾情况、钢包烧眼、漏钢预报报警情况等众多工艺生产因素对渣条形成情况进行判断分析,达到了对结晶器捞渣操作的精细控制,优化了结晶器内坯壳的润滑和传热条件,对降低漏钢率起到了显著的效果,使得CSP年漏钢率由0.07%降低到了0.03%。 展开更多
关键词 薄板坯连铸 结晶器 保护 操作 漏钢 控制
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管对接斜45°固定焊操作方法对比 被引量:1
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作者 刘增峰 刘永庆 +1 位作者 刘春 臧立欢 《石油技师》 2017年第1期90-92,共3页
管对接斜45°固定焊是焊工技能竞赛中难度较大的项目,通常采用单面焊双面成型技术。竞赛选手大多根据自身的特点及理解进行焊接工艺的编排,但是在日常培训中,焊件探伤评价时经常发现根部存在气孔及条渣。因此,根据项目特点设计了两... 管对接斜45°固定焊是焊工技能竞赛中难度较大的项目,通常采用单面焊双面成型技术。竞赛选手大多根据自身的特点及理解进行焊接工艺的编排,但是在日常培训中,焊件探伤评价时经常发现根部存在气孔及条渣。因此,根据项目特点设计了两组焊接工艺实验,以期优化管对接斜45°固定焊焊接工艺,进一步提升焊接质量。 展开更多
关键词 焊件 技术 根部 工艺 竞赛 单面 条渣 特点
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Influence of initial alkalinity on the hydration of steel slag 被引量:15
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作者 WANG Qiang YANG JianWei YAN PeiYu 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第12期3378-3387,共10页
The influences of different alkaline conditions on the kinds and morphologies of steel slag's hydration products, Ca(OH)2 con- tent of hydration products, pore stiucture of hardened paste, non-evaporable water cont... The influences of different alkaline conditions on the kinds and morphologies of steel slag's hydration products, Ca(OH)2 con- tent of hydration products, pore stiucture of hardened paste, non-evaporable water content of hydration products, and strength of steel slag mortar were investigated by changing the initial alkalinity of the hydration condition of steel slag. The results showed that increasing the initial alkalinity of hydration condition can promote the early hydration of steel slag's active com- ponents (e,g., C2S, C3S, and C12A7), but it has little influence on their late-age hydration degree. The hydration degree of non-active components (e.g., RO phase and Fe304) of steel slag is very low even under strong alkaline condition with pH value of 13.8. The excitation effect of alkaline condition on the early hydration of steel slag is more obvious with the increase of pH value, but the kinds of steel slag's hydration products are not influenced by changing the alkaline condition. The amount of steel slag's hydration products is limited, so the strength of alkali-activated steel slag mortar is very low though the strong al- kaline condition significantly promotes the early hydration of steel slag. Steel slag is not an ideal raw material for alka- li-activated cementitious material. 展开更多
关键词 steel slag ALKALINITY HYDRATION cementitious material
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