碳酸氢钠浸出钙化熟料制备V_2O_5的试验研究

Experimental Research on Leaching Calcification Clinker of Vanadium Slag by Sodium Bicarbonate for Preparation of V_2O_5

以钒渣钙化焙烧熟料为原料,采用碳酸氢钠浸出—碳酸（氢）铵沉钒工艺进行了制备V2O5的试验。重点研究了浸出温度、浸出时间、浸出剂浓度、液固比对浸出效果的影响和浸出液净化、沉钒的工艺条件。研究结果表明,钙化熟料在浸出温度95℃、浸出时间120 min、碳酸氢钠浓度15.8%、液固比3∶1-4∶1的工艺条件下浸出,获得的钒转浸率≥92%;浸出液按wAl/wSi=0.6-0.8加入偏铝酸钠除硅和碳酸（氢）铵沉淀偏钒酸铵,煅烧获得的五氧化二钒纯度为99.87%,其它各项指标均满足YB/T 5304-2011标准要求。

The preparation of V2O5 by the processes of sodium bicarbonate（ Na HCO3） for leaching and ammonium carbonate（（ NH4）2CO3） or ammonium bicarbonate（ NH4HCO3） for vanadium precipitation was studied with vanadium slag clinker by calcified roasting as raw materials. The research mainly focused on the effects of leaching temperature,leaching time,leaching agent concentration and liquid-solid ratio on the vanadium leaching rate,and the conditions of leachate purification and vanadium precipitation were also investigated. The results show that more than 92% of leaching rate can be achieved under conditions as follows： leaching temperature 95 ℃,leaching time 120 min,concentration of Na HCO315. 8% and liquid-solid ratio 3∶ 1 - 4∶ 1,and V2O5 which has the purity of 99. 87% and satisfies the YB / T 5304- 2011 standard can be obtained by adding sodium aluminate in the leachate for silicon removal with wAl/ wSi= 0. 6 - 0. 8 and precipitating vanadium with（ NH4）2CO3or NH4HCO3.