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for facilities to resist the corrosion of strong basic system in operation. Moreover, SiO2 will be dissolved in leaching liquor as silicates under so high concentration of OH- in the process. Recent... concentrated sulphuric acid. Impurities in leaching liquor were analyzed by atomic absorption spectroscopy (AAS). Impurities (concentration) in different volume of each sample were calculated in a uniform......
leaching was adopted to treat the residue from copper anode slime pretreated by alkaline pressure oxidation leaching. The effects of many factors such as sulfuric acid concentration, temperature, time... increase with the increase of the concentration of sulfuric acid, especially for the leaching ratio of silver. The phase of undissolved copper in the leaching residue exists mainly in the elemental......
for 4 h, with the sulfuric acid concentration of 4.2 mol/L, the sulfuric acid lepidolite liquid to solid mass ratio of 3:1, and the stirring speed of 30 r/min, respectively. The kinetics research results... kinetics[J]. The Chinese Journal of Nonferrous Metals, 2012, 22(2): 585-590. [23] ABDEL L E A, RASHAD M M. Kinetic study on the leaching of spent nickel oxide catalyst with sulfuric acid[J]. Hydrometallurgy......
as mixture dust. On the other hand, the highly toxic arsenic gas might be produced during the sulfuric acid leaching [14]. Therefore, a combination of hydrometallurgical and pyrometallurgical...Trans. Nonferrous Met. Soc. China 26(2016) 575-580 Leaching behavior of metals from high-arsenic dust by NaOH-Na2S alkaline leaching Xue-yi GUO1,2, Yu YI1,2, Jing SHI1, Qing-hua TIAN1,2 1. School......
Kinetics study of leaching arsenic from Ni-Mo ore roasting in dust mixture of hydrochloric and sulfuric acidsHOU Xiao-chuan(侯晓川)1, 2, YANG Yun-de(杨润德)1, LI He(李贺)1, ZENG-li(曾理)2, XIAO Lian-sheng(肖连生... chlorate to arsenic in the smelter dust) and the initial H+ concentration on leaching arsenic were studied. The results indicate that the leaching of arsenic increases sharply with the decrease......
is 2, and the concentration of sulfuric acid is 300 g/L. Then, the residue has been agitated for 3 h with leaching temperature of 80 °C. Finally, the selenium concentrations of the filtered solution... residue to sodium chlorate is 2, the concentration of sulfuric acid is 300 g/L, and the residue is agitated for 3 h at leaching temperature of 80 °C, the leaching rate of selenium could reach 97.76......
到充分搅拌,因而镍钴浸出率反而减小,所以,选择搅拌速度250 r/min为最优值. 图7 硫酸初始质量分数对镍和钴浸出率的影响 Fig. 7 Effect of sulfuric acid concentration on leaching rate of nickel and cobalt 图8 搅拌速度对镍和钴浸出率的影响 Fig. 8 ... Utilization of Platinum Metals, Kunming 650106, China) Abstract: By comparing with the processing technologies of superalloys between domestic and abroad, the atomized spray-sulfuric acid leaching......
in a thermostatic water bath. The initial leaching solution of 20 g/L Fe3+ concentration and 20 g/L sulfuric acid concentration was prepared by adding analytically pure ferric sulfate and 98% sulfuric acid... h for the acid leaching process. Fig. 1 Effect of liquid-to-solid ratio on carbonate decomposition ratio (Conditions: 20 g/L Fe3+ concentration,20 g/L sulfuric acid concentration, 80 °C and 3 h......
