氧化铝工业产出赤泥脱钠新工艺

来源期刊：有色金属2010年第3期

论文作者：王云山 杨刚 张金平

文章页码：61 - 64

关键词：有色金属冶金； 赤泥； 脱钠； 湿法浸出； 资源化

Key words：nonferrous metals metallurgy； red mud； sodium elimination； leaching； resource utilization

摘    要：采用绿色化学新工艺脱除赤泥中的钠。试验条件下氯化铵浸出赤泥中钠的较适宜工艺参数为:反应温度160℃、反应时间4h、氯化铵用量为理论用量的1.5倍、赤泥粒度为94~150μm。赤泥不溶性残渣中的Na₂O含量可以降低到1%以下,满足作水泥材料要求。钙、镁、钠通过体系中NH₃和CO₂及烟道气中提取的CO₂与氯化铵分离,氯化铵循环利用。

Abstract: The process of sodium elimination from the red mud by the green chemical new technology is investigated.The feasible processing parameters under experimental conditions of leaching sodium from red mud by ammonium chloride are that the reaction temperature is 160℃,the reaction time is 4h,the dosage of ammonium chloride is 1.5 times of its theoretical amount,and the size of red mud is 94~150μm.The content of Na₂O in the insoluble residue can drop to less than 1%,and accord with the requirement for cement.The calcium,magnesium and sodium can be separated from ammonium chloride by the ammonia and carbon dioxide in the system and the carbon dioxide from stack gas,and then the ammonium chloride can be recycled.