独居石稀土精矿加焦煤的高温脱磷研究

On the High-Temperature Dephosphorization of Monazite Concentrate with Coking Coal

基于未来工业应用,对独居石稀土精矿加焦煤的高温脱磷进行了研究.结果表明,焦煤是独居石精矿的有效脱磷剂之一;独居石中的磷被焦煤脱除的主要温度范围为1 200～1 400℃;独居石加焦煤球团在1 400℃焙烧2 h,脱磷率达到了96.5%;焙烧温度是影响独居石脱磷的主要因素,焙烧时间超过1 h后对独居石脱磷率提高不是很明显;焦煤的粒度对独居石的脱磷率也有较大影响,焦煤粒度最好在150μm左右;当温度小于1 500℃时,Fe和Fe2O3对独居石焦煤球团的脱磷几乎没有影响.

Viewing the industrial applications in future,the high-temperature dephosphorization of monazite concentrate with coking coal was investigated experimentally.The results showed that coking coal is one of the efficient reducing agents for the dephosphorization of monazite concentrate,to which the dephosphorizing temperature is mainly in the range from 1 200 to 1 400 ℃.When the monazite pellets,made by pressing monazite,coking coal and water together in mould,are roasted for 2 h at 1 400 ℃,the dephosphorizing rate of monazite comes up to 96.5%.The roasting temperature is the main influencing factor on the dephosphorization of monazite,while the influence of roasting time on the dephosphorization is unobvious if it is over 1 h.The particle size of coking coal also has influence on the dephosphorization of monazite,and the size about 150 μm is better.Fe and Fe2O3 have scarcely any influence on the dephosphorization of monazite.