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; accepted 19 January 2010 Abstract: Boric acid and kieserite were prepared from low-grade ascharite by sulfuric acid method. This method results in the recovery of 71.06% and 45.03% for boric acid... of amount of sulfuric acid, mass fraction of sulfuric acid, reaction temperature and reaction time on the leaching rate of boric acid were studied. The results show that the leaching rate of boric......
in aqueous solution depending on some factors such as time, sulfuric acid amount, bauxite dosage, initial Cr(VI) concentration, formic acid concentration, daylight and temperature were presented. The obtained results show that sulfuric acid amount, bauxite dosage and initial Cr(VI) concentration of solution are most effective parameters on the reduction process. Also, it has been found that the 60 g......
sulfate, concentrated sulfuric acid, copper electrolyte, copper anode (0.75 m×0.78 m) and starting sheet (0.77 m×0.81 m). The main equipment in the industrial experiments consisted of stainless-steel... Materials, 2000, 77(1): 241-252. [6] PANDA B, DAS S C. Electrowinning of copper from sulfate electrolyte in presence of sulfurous acid[J]. Hydrometallurgy, 2001, 59(1): 55-67. [7] QIU Yong-hai, TANG Ren......
Synergistic extraction of rare earths by mixture of HDEHP and HEH/EHP in sulfuric acid medium HUANG Xiaowei1,ZHU Zhaowu1,ZHANG Yongqi1,WANG Chunmei1,ZHANG Guocheng1,LI Jianning1 (1.National..., Sm, Gd) in sulfuric acid medium using the mixture of HDEHP(H2B2) and HEH/EHP(H2L2) was investigated. The synergistic enhancement coefficient(R) was calculated for La (1.96), Nd(3.52), Sm(5.96......
alloy from Africa were studied by the mixed acid solution of sulfuric acid and hydrochloric acid with oxidant. The experimental results show that more than 97% of Cu and Co can be reached under... r/min at the lower mole ratio of sulfuric acid to hydrochloric acid and at 80 ℃. The formation of silica gel can be prevented under modified experimental condition. Slurry can be easily filtrated......
Removal of copper from nickel anode electrolyte through ion exchange CHEN Ai-liang(陈爱良)1, 2, QIU Guan-zhou(邱冠周)1, ZHAO Zhong-wei(赵中伟)2, SUN Pei-mei(孙培梅)2, YU Run-lan(余润兰)1 1...; Abstract: An novel method for removal of copper from nickel anodic electrolyte through ion exchange was studied after cupric......
, Xihua University, Chengdu 610039, China Received 6 September 2011; accepted 6 April 2012 Abstract: The special experimental device and sulfuric acid electrolyte were adopted to study the influence...: aluminum alloy; 2024 aluminum alloy; oxidation heat; sulfuric acid electrolyte; hard anodic oxidation; anodic film 1 Introduction Conducting hard anodizing on the surface of aluminum parts......
University, Beijing 100083, China摘 要:The effect of the microstructure of an Al 7050-T7451 substrate on the anodic oxide formation in sulfuric acid was studied... of intermetallic phases and grain or subgrain boundaries on the oxide film formation were researched using the potentio-dynamic and potentiostatic polarization technique in sulfuric acid solution......
: The properties of anodic films formed in chromic, boric-sulfuric and adipic-sulfuric acid (CAA, BSAA and ASAA, respectively) on LY12 aluminum alloy were studied by morphology characterization, current... anodization; boric-sulfuric acid anodization; adipic- sulfuric acid anodization 铝及铝合金由于其优异的综合性能而受到广泛重视,尤其在航空领域,一直用作最重要的结构材料之一[1].阳极氧化是最常用于提高其耐蚀性的方法之一.铬酸阳极氧化作为传统的铝合金阳极氧化技术,其氧化膜具有良好的性能,但是铬酸阳极氧化中六价铬的大量使用会带来严重的环境污染......
of millscale from steel plant and the effects of the liquid-solid ratio, the reaction temperature, the leaching time and the sulfuric acid excessive times was investigated. The best technical conditions of the leaching process were ascertained, and the kinetics of leaching was studied. The results show that when liquid-solid ratio is 3?1, the sulfuric acid excess is 1.25 times, reaction temperature......