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Leaching kinetics of calcium molybdate with hydrochloric acid in presence of phosphoric acid

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Transactions of Nonferrous Metals Society of China 2019年第4期29卷 859-867页

作者： Wen-juan ZHANG Cheng-yan WANG Bao-zhong MA School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

calcium molybdate(CaMoO4)is the main component of powellite and is a predominant intermediate in the pyrometallurgical and hydrometallurgical process of *** extraction of Mo from CaMoO4 by a combination of phosphoric acid and hydrochloric acid was *** further understanding of the leaching mechanism,the effects of five key factors were studied to describe the leaching *** results indicated that the dissolution rate of CaMoO4 was independent of the stirring *** extraction significantly increased with increasing HCl concentration and temperature,but decreased with increasing particle size.A shrinking core model with surface chemical reaction was found to withstand the dissolution of *** apparent activation energy was calculated to be 70.879 kJ/mol,and a semi-empirical equation was derived for the rate of reaction.

关键词： calcium molybdate leaching kinetics phosphoric acid hydrochloric acid

Molybdenum recovery from oxygen pressure water leaching residue of Ni-Mo ore

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Rare Metals 2013年第2期32卷 208-212页

作者： Ming-Shuang Wang Chang Wei Gang Fan Zhi-Gan Deng Si-Fu Wang Jun Wu Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology

This article investigated molybdenum recovery from oxygen pressure water leaching residue of Ni-Mo ore using alkaline leaching, followed by chemical treatment of leach liquor. Parameters affecting Mo leaching rate, such as sodium hydroxide concentration, reaction time, a liquid- to-solid ratio, and temperature for the preliminary alkaline leaching were experimentally determined. The results showed that more than 88 % of molybdenum was leached under the optimum conditions （2.5 ml.g-1 NaOH, 80 ℃, a liquid to solid ratio 3 ml.g-1, and reaction time 3 h）. After the purification of leach liquor, a CaMoO4 product of 99.2 % purity could be obtained by CaCla precipitation method. The whole Mo recovery reached about 82.7 %.

关键词： Mo recovery Residue Alkaline leaching calcium molybdate

Enhancement of CaMoO_(4) calcine decomposition and recovery of calcium resource by HCl cycle leaching

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Transactions of Nonferrous Metals Society of China 2022年第4期32卷 1314-1324页

作者： Li ZENG Man WANG Chao XIAO Sheng-xi WU Gui-qing ZHANG Wen-juan GUAN Qing-gang LI Zuo-ying CAO School of Metallurgy and Environment Central South UniversityChangsha 410083China Key Laboratory of Metallurgical Separation Science and Engineering of Non-ferrous Metals Industry Central South UniversityChangsha 410083China National Engineering Laboratory for Efficient Utilization of Refractory Non-ferrous Metals Resources Central South UniversityChangsha 410083China

The thermodynamic equilibrium diagrams of CaMoO_(4)-CaSO_(4)-H_(2)SO_(4)-H_(2)O,CaMoO_(4)-HCl-H_(2)O and CaSO_(4)-CaCl_(2)-HCl-H_(2)O systems at 298 K were *** calculation results demonstrated that HCl displays a much higher solubility of CaSO_(4)than H_(2)SO_(4).The leaching mechanism of Mo from CaMoO_(4)calcine was systematically investigated from the perspective of the micro particle properties *** exhibits an excellent leaching performance for Mo from CaMoO_(4)calcine due to the elimination of surface coating and the dissolution of a mass of Mo embedded in CaSO_(4)*** Mo leaching efficiency of 99.7%was achieved under the optimal conditions of decomposing CaMoO_(4)calcine by 2.4 mol/L HCl with a liquid/solid ratio of 10:1 at 50°C for 60 *** on the experimental results,a highly efficient and green cycle leaching process of molybdenum from molybdenite was proposed,which eliminated surface coating and physical entraining,and converted most of the calcium from CaMoO_(4)calcine into high purity gypsum by-product.

关键词： calcium molybdate molybdenum H2SO4 leaching HCl leaching thermodynamics