The leach residue of nepheline is treated with nitric acid to produce aluminium nitrate, the latter was added in ammonia liquor to produce aluminium hydroxide and ammonium nitrate.

• 介绍硝酸处理霞石浸出渣,硝酸铝加入饱和氨水生成氢氧化铝和硝酸铵,氢氧化铝在气体悬浮炉中煅烧,生产砂状氧化铝的工艺流程及设备。