Experimental Study on Alkali Decomposition of Low Grade Tungsten Concentrates under Microwave Heating

Abstract:

Decomposition of the low-grade mixed Scheelite and Wolframite concentrate in sodium hydroxide was carried out under microwave and isothermal conditions. Experimental results showed that the leaching rate of tungsten was mainly affected by reaction temperature, reaction time, and tungsten grain size. The experiment was carried out at a temperature of 105 °C, 550 g•L^-1 sodium hydroxide concentration, liquid to solid ratio of 30:1, the holding time of 150min, stirring speed of 600rpm, particle size of 0.040-0.054mm, intensified by microwave. As a result, tungsten leaching rate can reach 99.53%. Compared with ordinary electric heating, microwave heating alkali decomposition of tungsten concentrate can save time.

• Periodical: Applied Mechanics and Materials (Volumes 291-294)
• Pages: 2625-2630
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.291-294.2625
• Online since: February 2013
• Authors: Qing Yun Zeng, Zi Yan Zhang, Xi Qing Zhang
• Keywords: Alkali Decomposition, Energy Saving, Microwave Heating, Tungsten Concentrates

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