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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......
as the reductant in a dilute sulfuric acid medium. The effects of banana peel amount, H2SO4 concentration, reaction temperature, and time on Mn leaching from the complex LGMO were studied. A leaching efficiency of ~98% was achieved at a leaching time of 2 h, banana peel amount of 4 g, leaching temperature of 120°C,manganese ore amount of 5 g, and sulfuric acid concentration of 15 vol%. The phase......
in reaction (3) returns to the leaching solution, thus maintaining the concentration of HNO3 constant, that is, HNO3 is used as a catalyst. The elemental sulfur formed in reaction (1) is extracted... because of its high solubility for sulfur and its stability in the leaching pulp thus facilitating recycling as shown in reaction (6). The operational schematics of the coupled process is shown in Fig.1.......
". 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......
for preparing pure manganese sulfate from low-grade ores with a granule mean size of 0.47 mm by direct acid leaching was developed. The effects of the types of leaching agents, sulfuric acid concentration, reaction temperature, and agitation rate on the leaching efficiency of manganese were investigated. We observed that sulfuric acid used as a leaching agent provides a similar leaching efficiency......
sulfuric acid concentrations(0.2–2.0 M) at two temperatures(323 and 353 K) was performed. The tests were conducted using both conventional and ultrasound-assisted leaching. After the leaching tests...Ultrasound effects on zinc recovery from EAF dust by sulfuric acid leachingK.Brunelli,M.DabalàDepartment of Industrial Engineering, University of Padua摘 要: sulfuric acid leached residue reaches as high as 66.5% by using 0.1 mol/L EDTA-Na2 solution. The results indicate that two-step sequential extraction procedure combining 1.25 mol/L sulfuric acid... a suitable acid system to leach Cd, Cu, Fe and Zn from original zinc smelting slag, and 2) to optimize the concentration of EDTA-Na2 for leaching acid leached residue at the following step. 2 Experimental 2.1......Extraction of metals from a zinc smelting slag using two-step procedure combining acid and ethylene diaminetetraacetic acid disodium
来源： 《中南大学学报(英文版)2012年第7期》——蒋凯琦 郭朝晖 肖细元 张珑
tellurium was prepared from neutralization sludge by the method of sulfuric acid leaching and sulfur dioxide reduction. The results shows that, in the process of sulfuric acid leaching of neutralization sludge, the leaching rate of tellurium is 100% when the reaction temperature is 30 ℃, reaction time is 0.5 h, sulfuric acid concentration is 53.9 g/L, the dosage of sulfuric acid is 1.5 times......
examined in the range of 0.4 to 1.0 MPa under constant conditions. The experimental data and the fitting results are shown in Figure 10. Figure 9 Effect of sulfuric acid concentration on leaching...-zhi, ZHOU Shuang, ZHANG Guo-quan. Kinetics of indium dissolution from marmatite with high indium content in pressure acid leaching [J]. Rare Metals, 2017, 36(1): 69-76. DOI: DOI......
