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energy of 9.783 kJ/mol was analyzed by shrinking core model, and the whole transformation process is controlled by solid product layer diffusion. A semi-empirical kinetics equation was obtained to describe the conversion process. Key words: bismuth oxide; ball-milling transformation; bismuth subcarbonate; kinetics; shrinking core model 1 Introduction Bismuth is a green and non-toxic metal. Since......
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are smaller than 43 μm, 40 ℃, and 160 r/min, respectively. The dissolution of quartz fits the shrinking core model, 1-(2/3)α-(1-α)2/3=k1t, which shows that the decision step of controlling the overall... leaching; dissolution kinetics; shrinking core model 目前全世界已有约50个采用微生物冶金浸出铜矿石的工业应用实例.但这些实例主要处理原生硫化矿废石,次生硫化矿和氧化矿.黄铜矿作为一种原生硫化矿,由于其晶格能远高于其他硫化铜矿,并且在氧化条件下表面生成的产物很稳定,因此其微生物浸出速率和浸出率都不理想,导致工业应用缓慢[1-3].脉石矿物是铜矿中的含量最多......
confirmed by the experimental data fitting with shrinking core model of liquid-solid multiphase reaction. The results show that there are two stages in the leaching process. Earlier stage is limited...-controlling step changes with the reaction progress. Key words: high-aluminum fly ash; desilication; leaching; kinetics; shrinking core model 高铝粉煤灰是近年来出现在我国山西北部及内蒙古中西部地区的一种新型粉煤灰类型,氧化铝含量可达40%~50%,相当于我国中低......
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for the leaching process is established, and the apparent activation energy is 11.611 kJ/mol. The leaching process of clay mineral could be simulated with a shrinking core model, which indicates... and sulfuric acid concentration. Key words: clay vanadium mineral; leaching kinetics; shrinking core model; activation energy ......
transfer in the solution is the controlling mechanism. Key words: rare earth elements; apatite; leaching; response surface methodology; shrinking core model 1 Introduction The demand for rare earth... and the presence of additives on the column leaching of REEs from apatite by hydrochloric acid, nitric acid and sulfuric acid solutions. They studied the kinetics of leaching by shrinking core model and reported......
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with shrinking core model, which is expressed as a mathematical formula of kt=1-(1-X)1/3 and the apparent activation energy is 43.4 kJ/mol. The model indicates that the conversion process is controlled by the interface chemical reaction process. Key words: salt lake calcium sulfate; calcium carbonate; high-purity calcium oxide; conversion method; shrinking core model 氧化钙是一种重要的无机材料,用于制造电石,液碱,漂白粉,广......
