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Jiangxi Nonferrous Metals Society
ISSN：1674-9669
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CODEN YJKYA9
Volume 8 Issue 2
Apr.  2017
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XIAO Chao, ZENG Li, XIAO Liansheng. Thermodynamic study on acid decomposition of calcium molybdate and its application[J]. Nonferrous Metals Science and Engineering, 2017, 8(2): 14-18. DOI: 10.13264/j.cnki.ysjskx.2017.02.003
Citation: XIAO Chao, ZENG Li, XIAO Liansheng. Thermodynamic study on acid decomposition of calcium molybdate and its application[J]. Nonferrous Metals Science and Engineering, 2017, 8(2): 14-18. DOI: 10.13264/j.cnki.ysjskx.2017.02.003
shu

Thermodynamic study on acid decomposition of calcium molybdate and its application

  • 1a.

    School of Materials Science and Engineering

  • 1b.

    Guangxi Key Laboratory in Universities of Clean Metallurgy and Comprehensive Utilization for Non-ferrous Metals Resources, Guilin University of Technology, Guilin 541004, China

  • 2.

    School of Metallurgy and Environment, Central South University, Changsha 410083, China

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  • Received Date: September 18, 2016
  • Published Date: April 29, 2017
    Graphical Abstract
    • Abstract
  • According to the laws of simultaneous equilibria and mass conservation, the lgC-pH diagram of a CaMoO4-H2SO4/HCl-H2O system was established on the basis of the modynamic date at 298 K. Thermodynamic analysis was carried out to show the effect of technical conditions on acid decomposition of CaMoO4. The results show that there are three stable areas of various solid phases of the CaMoO4-H2SO4-H2O system in the pH range of 0~7.0. The first one is H2MoO4(s) and CaSO4(s) (0 < pH < 3.5), the second one is H2MoO4(s) CaMoO4(s) and CaSO4(s) (3.5 < pH < 4.5), and the third one is CaMoO4(s) (4.5 < pH < 7.0). There are three stable areas of various solid phases of the CaMoO4-HCl-H2O system in the pH range of 0~7.0. The first one is H2MoO4(s) (0 < pH < 2.9), the second one is H2MoO4(s) and CaMoO4(s) (2.9 < pH < 4.5), and the last one is CaMoO4(s) (4.5 < pH < 7.0). Thermodynamics analysis results show that calcium molybdate is easily decomposed by acid; compared with the sulfuric acid leaching process, hydrochloric acid leaching calcium molybdate does not produce CaSO4, which reduces leaching product covered by calcium molybdate. The experiment proves that compared with hydrochloric acid, calcium molybdate is a kind of better leaching agent, and the leaching of molybdenum reaches 98.56 % at 25 ℃ for 45 min with HCl concentration of 2.4 mol/L at a VL/WS ratio of 10 mL/g.
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