硼泥中氧化镁组分的盐酸浸出工艺研究

Study on magnesium oxide leaching technology with hydrochloric acid from boron mud

为解决硼泥带来的环境污染问题,充分利用其中的镁元素制备镁盐和其他镁化工产品,进行了硼泥的盐酸浸出实验研究。首先采取煅烧的方式对硼泥活化预处理,研究了煅烧温度、煅烧时间对工艺的影响,得到适宜的煅烧工艺条件:煅烧温度为600℃、煅烧时间为2 h;在盐酸浸出硼泥工艺过程中,研究了盐酸用量、酸浸温度、酸浸时间对硼泥中氧化镁浸出率的影响,得到适宜的酸浸工艺条件:盐酸用量为2.5 mL/g、酸浸温度为95℃、酸浸时间为1 h,在此条件下氧化镁的浸出率达到95.8%。硼泥浸出渣的XRD测试表明,硼泥主要含有的镁物相镁橄榄石和菱镁矿已被完全浸出。

The experiment of boron mud leaching technique with hydrochloric acid was studied. Its aim is to solve the problem of social and environmental problems caused by boron mud and to fully-use magnesium in the boron mud to prepare magne-sium products.In the process of test ,firstly, boron mud was pretreated with the method of calcination.The effects of calcination temperature and calcination time on the leaching process were investigated.The appropriate calcination technical conditions were obtained as follows ：the calcination temperature was 600 ℃ ,and the calcination time was 2 h.In the process of boron mud leaching with hydrochloric acid, the effects of dosage of hydrochloric acid, leaching temperature, and leaching time on the leaching rate of magnesium oxide in the boron mud were studied.It also got the appropriate leaching conditions as follows ： the dosage amount of HCI was 2.5 mL/g,the leaching temperature was 95 ℃ ,and the leaching time was 1 h.Under those con-ditions ,the leaching rate of magnesium oxide reached 95.8%.The XRD results of leaching residue showed that forsterite and magnesite in the boron mud were completely leached.