真空铝热还原法生产金属锶--铝热还原工艺的研究

在研究了SrCO3热分解的基础上,进一步研究了在还原过程中各种工艺参数对还原率的影响·随着还原温度的升高,还原率直线升高,在1200℃时可达到82%;随着还原时间的延长,初期(1～3h)还原率增加较快,4～5h后,还原率增加趋于平缓;在研究的范围内,制团压力对还原率的影响不大;在活性相同时,还原剂的粒度越细则还原率越高;虽然随着还原剂数量的增加,还原率随之增加,但有一最高值,而后增加还原剂的数量,还原率反而下降·在一般条件下还原率可达75%,最高可达82%,完全满足生产要求·

Preparation of Strontium by Vacuum Aluminothermy Reduction

On the basis of thermal decomposition of SiCO3 influences of various technological parameters on reduction rate in the process of reduction were investigated. It was found that with the increase of reduction temperature, reduction rate increases up to 82% at 1200°C, and reduction rate increases fast at the beginning (the first 1-3 h) with prolonging reduction time then it increases gently in the successive 1-2 h. With the same activity, the finer the grain size of reducing agent, the higher the reduction rate. Although the reduction rate increases with amount of reducing agent, but there is a peak value of reduction rate and, exceeding it the rate will not increases, but decrease with the increase of the amount of reducing agent. In general reduction rate can be up to 75% even to 82% as maximum. Such a result can meet the requirement of actual production.