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中南大学学报(英文版)

Journal of Central South University

Vol. 10    No. 4    December 2003

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Decomposing scheelite and scheelite-wolframite
mixed concentrate by caustic soda digestion
SUN Pei-mei(孙培梅),LI Hong-gui(李洪桂),LI Yun-jiao(李运姣),
ZHAO Zhong-wei(赵中伟),
HUO Guang-sheng(霍广生),SUN Zhao-ming(孙召明),LIU Mao-sheng(刘茂盛)

School of Metallurgy Science and Engineering,
Central South University, Changsha 410083, China

Abstract:Scheelite and scheelite-wolframite mixed concentrates with different grades were decomposed by caustic soda digestion, and the effects of caustic soda(NaOH) dosage, the ratio of water to ore and the stirring rate on tungsten recovery were studied. The results show that under the conditions that the ratio of water to ore is 0.8, stirring rate is 500 r·min-1 and the heating time is 2.0 h at 160℃, the recovery of tungsten reaches 98% for scheelite (w(WO3) is 65.04%) and wolframite containing high proportion of calcium (w(WO3) is 65.58%,w(Ca) is 7.53%), when caustic soda dosage is 2.2 and 2.0 times of theoretical value, respectively; the recovery of tungsten can be more than 98%,98%and 96% respectively for low-grade scheelite-wolframite mixed concentrate with 55.78%, 45.32% and 25.21% WO3,when caustic soda dosage is 2.6,3.2 and 5.5 times of theoretical value, respectively.

 

Key words: scheelite concentrate; wolframite with high proportion of calcium; low-grade scheelite-wolframite mixed concentrate; caustic soda digestion

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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