共搜索到32511条信息，每页显示10条信息，共3252页。用时：0小时0分0秒575毫秒
of fayalite,titanomagnetite,and spinel.During the high pressure oxidative acid leaching process,the fayalite and spinel phases are gradually decomposed by sulfuric acid,causing the release of vanadium and iron in the solution.Meanwhile,unreacted silicon and titanium are enriched in the leach residues.With the initial concentration of sulfuric acid at 250 g·L-1,a leaching temperature of 140℃,a leaching time......
......
of acid-soluble Cr(VI) from COPR, followed by leaching time, whereas the effects of HF concentration and leaching temperature are slight and the influence of stirring rate is negligible. The leaching... to HF concentration and particle size is 0.493 8 and -2.013 3, respectively. Key words: leaching; kinetics; hydrofluoric acid; hexavalent chromium; chromite ore processing residue 1 Introduction......
and sulfuric acid leaching. The influence of mineralogy, acid concentration, leaching temperature, leaching time, and liquid to solid ratio was experimentally studied. It is observed that after the ground ore...Sulfuric acid leaching of low-grade refractory tantalum–niobium and associated rare earths minerals in Panxi area of ChinaBiao Wu,He Shang,Jian-Kang WenNational Engineering Laboratory......
Concentration Boundary Layer Model of Mortar Corrosion by Sulfuric Acid宋志刚College of Architectural Engineering,Kunming University of Science and Technology摘 要:sulfuric acid is 3.5 and 4.0 respectively.The pH meter is used to monitor the soak solution and the titration sulfuric acid with given concentration is added to maintain original pH value......
Leaching kinetics of molybdenum from Ni-Mo ore in sulfuric acid solution with sodium peroxodisulfate as oxidantLIU Zhi-xiong(刘志雄)1, YIN Zhou-lan(尹周澜)2, CHEN Yi-guang(陈义光)3, XIONG Li-zhi(熊利芝)3(1.... College of Biology and Environmental Sciences, Jishou University, Jishou 416000, China)Abstract:The leaching kinetics of molybdenum from Ni-Mo ore in sulfuric acid solution with sodium......
". The activation energy for pressure leaching high iron sphalerite concentrate is 55.04 kJ/mol. 3) The apparent reaction order for the initial sulfuric acid concentration is -0.318 2. When the amount...; Abstract: The kinetics of pressure leaching high iron sphalerite concentrate was studied. The effects of agitation rate, temperature, oxygen partial pressure, initial acid concentration, particle size......
: the liquid to solid ratio (mL/g) of 5:1, the leaching temperature of 453 K, the retention time of 2 h, the initial sulfuric acid concentration of 0.74 mol/L, the oxygen partial pressure of 0.7 MPa... of copper dust as a contrast test is carried out under the following conditions: the liquid to solid ratio (mL/g) of 5:1, the initial sulfuric acid concentration of 0.74 mol/L, and the leaching temperature......
) Abstract: The high pressure acid leaching of zinc powder replacement residue containing gallium and germanium was carried out. The effects of sulfuric acid concentration, liquid to solid ratio, time... investigated. The results show that increasing sulfuric acid concentration till 156 g/L benefits the leaching of gallium and germanium. Above this point, the leaching rate of germanium will decrease......
Sulfuric acid leaching kinetics of South African chromiteQing Zhao1,2,Cheng-jun Liu1,Pei-yang Shi1,Bo Zhang1,Mao-fa Jiang1,Qing-song Zhang1,Ron Zevenhoven2,Henrik Saxén21. Key Laboratory...">The sulfuric acid leaching kinetics of South African chromite was investigated. The negative influence of a solid product layer constituted of a silicon-rich phase and chromium-rich sulfate......
