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of the oxalic acid is more than 95%, and its concentration in the extraction raffinate lower than 0.004 0 mol/L after six-stage counter-current extraction; while the phase ratio (VO/VA) of the stripping at 1.0, the recovery of oxalic acid attains more than 95% after ten-stage counter-current stripping. Key words: P350; counter-current extraction; oxalic acid; stripping  ......
0 mol/L after six-stage counter-current extraction. While the phase ratio (O/A) of the stripping was at 1.0, the recovery of oxalic acid attained more than 95% after ten-stage counter-current stripping. Key words: P350; counter-current; solvent extraction; oxalic acid; stripping ____________________________________________________________________________________________ 1 Introduction......
, temperature, particle size of ore, stirring speed on the leaching behavior of zinc and the main impurity elements were investigated. The low grade zinc oxide ore was leached by two-stage counter-current..., and the leaching time 4 h. More than 90% of zinc is extracted, and pH of lixivium is less than 9.0 in the two-stage counter-current process, which satisfies the requirement of the subsequent solvent......
of stone coal, and two-stage counter-current leaching on the vanadium leaching ratio were studied. The results show that the vanadium leaching ratio of roasted stone coal through two-stage counter-current leaching can reach 65.1% at the mass ratio of H2SO4 to stone coal of 20%, leaching temperature of 95°C, leaching time of 30 h, liquid-to-solid ratio of 1.1 mL-g-1, and grinding fineness of 0.1 mm......
(INET-3),was investigated in this study.The separation parameters,such as equilibrium pH,phase ratio,INET-3 concentration,and number of counter-current extraction stages,were optimised.The results... of Dy from the leachate requires four counter-current extraction stages at A/O (volume ratio of aqueous to organic)=1:2.This is demonstrated by a simulated four-stage counter-current extraction......
(INET-3),was investigated in this study.The separation parameters,such as equilibrium pH,phase ratio,INET-3 concentration,and number of counter-current extraction stages,were optimised.The results... of Dy from the leachate requires four counter-current extraction stages at A/O (volume ratio of aqueous to organic)=1:2.This is demonstrated by a simulated four-stage counter-current extraction......
Na2MoO4固固相变的DTA-TG测定武克忠,崔维真,刘晓地摘 要:利用DTA TG热分析技术研究了无机塑晶材料Na2 MoO4 的热性能.实验数据表明 ,Na2 MoO4 的固 固相变焓为 2 0 1.4J/g ,是一种有前途的固 固相变贮能材料.固 固相变的机理是随着温度的升高 ,Na2 MoO4 晶体的晶格发生畸变 ,晶型由低对称的晶系向高对称的晶系转变 ,同时引入振动和转动无序 ,从而吸收热量.关键词:钼酸钠;固固相变;DTA方法;贮能材料;......
plotted for the extraction isotherm was validated for the requirement of three counter-current stages in the extraction at an O/A volume ratio of 2.0/3.5. The back-extraction of phosphorus from the loaded organic phase was quantitatively achieved by contacting 4.0 mol·L-1 H2SO4 solution in three stages of counter-current contact at an O/A volume ratio of 3/2. This study can be applied to remove......
固溶体的价电子结构与固溶强化 孙振国1,顾琳2,瞿晓剑2 (1.南京理工大学,材料工程系,江苏,南京,210094;2.江苏科技大学,材料科学与工程学院,江苏,镇江,212003) 摘要:为在价电子结构层次研究代位固溶体与间隙固溶体强化差异的本质,建立了代位固溶体含溶质晶胞点阵常数的计算公式,以余(瑞璜)氏固体与分子经验电子理论为基础,按BLD(键距差分析方法)分析方法计算了代位固溶体含溶质晶胞的价电子结构.结果表明:代位固溶体中含溶质原子晶胞的nA值与不含溶质原子晶胞的nA值相差无几,而间隙固溶体中含溶质原子晶胞的nA值远高于不含溶质原子晶胞的nA值.这-信息从价电子结构的角度深刻揭示......
有机固-固相变材料的研究进展 樊耀峰1,张兴祥1 (1.天津工业大学功能纤维研究所,天津,300160) 摘要:综述了多元醇与层状钙钛矿的研究进展,介绍了多元醇二元体系和几种"层状钙钛矿"相变材料的性能,储能机理和优缺点,提出一些可供选择的固-固相变材料,并指出几点研究相变材料时需要解决的问题. 关键词:固-固相变材料; 多元醇; 层状钙钛矿; [全文内容正在添加中] ......