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to clarify the influence of thermal history on the conversion of aluminate species in sodium aluminate solution in order to optimize Bayer alumina production. The interconversion of various solution... process. The Bayer process mainly consists of bauxite digestion, dilution and sedimentation of digested slurry, gibbsite precipitation from purified sodium aluminate solution, concentration of the spent......
is described for producing pure Sm2 O3 and Co3 O4. With either 10 vol% H2SO4 or 15 vol% HCI at 80 ℃ more than 95% Sm and Co are leached in 1 h.Extraction of Sm from sulphate leach liquor with TBP or Aliquat 336 was poor. Although extraction with TOPS-99 is quantitative but Sm from sulphate leach liquor precipitated as Sm2(SO4)3·8 H2 O. The chloride leach liquor at an initial pH of 2.5 and with 1.2 mol/L......
is described for producing pure Sm2 O3 and Co3 O4. With either 10 vol% H2SO4 or 15 vol% HCI at 80 ℃ more than 95% Sm and Co are leached in 1 h.Extraction of Sm from sulphate leach liquor with TBP or Aliquat 336 was poor. Although extraction with TOPS-99 is quantitative but Sm from sulphate leach liquor precipitated as Sm2(SO4)3·8 H2 O. The chloride leach liquor at an initial pH of 2.5 and with 1.2 mol/L......
Study on the Formation of Crystalline Rare Earth Carbonates from Rare Earth Ore Leaching Liquors喻庆华,李先柏摘 要:<正> The crystalline precipitate of rare earth carbonates has been produced by the ammonium bicar-bonate precipitation method in the recovery of RE from the ammonium sulfate leaching liquor of the weath-ered leach-deposited rare earth......
从提锂母液制取氟化钾的研究 周新泉1 (1.湘乡铝厂,湖南411400) 摘要:将提锂母液与氢氟酸反应,使母液中所有金属元素转化成氟化物.分离出溶解度小的氟化铝,氟化锂,氟化钠等.分离后的溶液进行浓缩,分步析出氟化钠,氟化钾和铷铯氟化物. 关键词:提锂母液; 氟化反应; 氟化钾; [全文内容正在添加中] ......
:Lignin as the main component of black liquor is generally employed to modify aliphatic superplasticizer(AFS). However, the modification effect is hard to evaluate correctly due to the uncertain molecular structure of lignin and the disturbance from the complexity of black liquor compositions. In this paper, the purified lignin via acid precipitation......
:The expanded industrial experiments were conducted with practical industrial liquor to separate free alkali from sodium tungstate solution by electrolysis with cation-exchange membrane. Experimental results... the anode feed liquor of sodium tungstate, with electric ef ficiency up to more than 88% and the unit energy consumption E lower than 1900 kWh/t; while three electrolysis cells in series are operated......
leaching, followed by chemical treatment of leach liquor. Parameters affecting Mo leaching rate, such as sodium hydroxide concentration, reaction time, a liquid-to-solid ratio, and temperature... ratio 3 ml·g-1 , and reaction time 3 h). After the purification of leach liquor, a CaMoO 4 product of 99.2% purity could be obtained by CaCl 2 precipitation method. The whole Mo recovery reached about......
-made reactors. The results indicate that factors,such as temperature,time,Al2O3 concentration,as well as SiO2 concentration,have profound impact on the SiO2 and Al2O3 concen-tration of pregnant liquor... concentration. The concentration of SiO2 in the pregnant liquor could be reduced to a lower level when the major effect parameters of this process are controlled properly.关键词:......
Utilization of Multimetallic Mineral, Ministry of Education, Northeastern University摘 要:Titanium has a great effect on the digestion of bauxite in the Bayer... in the Bayer process and clarify the mechanism of how additive lime improves the digestion of diaspore.关键词:......
