自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

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中南大学学报(英文版)

Journal of Central South University

Vol. 3    No. 2    December 1996

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A NEW TECHNOLOGY FOR PRODUCTION OF HIGH PURITY PARATUNGSTATE AMMONIUM FROM LOW GRADE TUNGSTEN CONCENTRATE
Sun Peimei1; Chen Zhouxi1;Li Honggui1; Li Yunjiao1; Liu Maosheng1; Chen Shuqiao2;   Liang Yongtang2

1. Department of Nonferrous Metallurgy, Central South University of Technology, Changsha 410083, China;
2. Siquan Chemical Industrial Plant, Yunan 527100, China

Abstract:A new technological process for production of paratungstate ammonium from low grade tungsten concentrate with a high content of calcium and impurities has been studied. The experiments show that average tungsten leaching efficiency of more than 96.92% can be obtained with a low NaOH consumption by using the mechanical activating caustic decomposition, and the content of main impurities (P, As, Si) in Na2WO4 solution obtained is competitive with that from standard wolframite concentrate by traditional caustic decomposition. After recovering caustic soda by crystallization, impure Na2WO4 solution is changed to (NH4)2WO4 solution by ion exchange method. Molybdenum may be removed from (NH4)2WO4 solution by new ion exchange method. Finally,paratungstate ammonium of high purity is obtained. This technology has the advantages of short technological process, high recovery of tungsten, high economic and social benifits.

 

Key words: low grade tungsten concentrate; mechanical activating caustic decomposition; ion exchange; paratungstate ammonium

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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