Yuanbo Zhang, Su Zijian, Liu Bingbing
May 1, 2014
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0
Influential Citations
22
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Journal
Hydrometallurgy
Abstract
Abstract Sodium stannate is widely used in the electroplating and tin alloy industries. The traditional sodium stannate production processes suffer a variety of disadvantages including long flowsheet, high production cost and strict requirements for the equipment. In this study, a novel process for preparing sodium stannate is developed by roasting tin dioxide and sodium carbonate in CO/CO 2 mixed gas followed by leaching the intermediate products in a diluted sodium hydroxide solution. The effects of roasting and leaching parameters on the leaching efficiency of Sn were investigated. The Sn leaching efficiency reaches 85.6% under the optimal experimental conditions: roasting temperature of 875 °C, CO content of 15%, roasting time of 15 min, Na 2 CO 3 /SnO 2 mole ratio of 1.5, liquid-to-solid ratio of 4 cm 3 /g, leaching temperature of 40 °C, leaching time of 60 min, and stirring speed of 300 rpm. Sodium stannate trihydrate (Na 2 SnO 3 · 3H 2 O) having a purity of 95.8% is successfully produced from cassiterite concentrates with a SnO 2 content of 76.4% through the new process, which is superior to the traditional approach for producing the industrial first-grade stannate.