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acid in 100 g cobalt ores, reaction time 2 h, reaction temperature 80 ℃, the ratio of liquid to solid 2?1 when high-arsenic cobalt ores was leached by sulfuric acid solution. The leaching rate of Co..., reaction temperature is 60 ℃, the ratio of liquid to solid is 3?1. Key words: high-arsenic cobalt ores; oxidation leaching; sulfuric acid; nitric acid ......
of oxygen to nitrogen. In an experimental procedure, 0.8 L solution with predetermined concentrations of copper sulfate and sulfuric acid was added to the leaching vessel and heated to the desired... excepted for a special mention for all tests were particle size of 74-150 μm, sulfuric acid concentration of 0.5 mol/L, copper ion concentration of 10 g/L, temperature of 80 ℃, stirring speed of 500 r/min......
,and the behavior of SiO2 in the process of clinker leaching is an important portion. To study the behavior of SiO2 in the process of high concentration clinker leaching,experiments were carried out in home... during the high concentration leaching. However,sodium carbonate and free caustic soda concentrations have no remarkable effect on it,thus they are the secondary factors compared with Al2O3......
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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......
) reduction. Their chemical compositions are shown in Table 1, which indicates high Fe and C content samples, except reduced iron powder. Potassium dichromate (K2Cr2O7), sulfuric acid (H2SO4) and other... J. Cent. South Univ. (2018) 25: 2119-2130 DOI: https://doi.org/10.1007/s11771-018-3901-x Reduction of Cr(VI) with a relative high concentration using different kinds of zero-valent iron powders......
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 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......
