流态化分离洗涤对熟料高质量浓度溶出浆液二次反应的影响

Effect of fluidized separating-washing of red mud on secondary reactions of leached slurry with high alumina concentration

采用流态化方式对烧结法熟料高质量浓度溶出浆液分离和赤泥洗涤进行研究。研究结果表明:对于Al2O3质量浓度为240～270 g/L的熟料溶出浆液,经流态化分离洗涤,可以同时实现浆液的固液分离和赤泥的洗涤,获得的溢流(粗液)Al2O3质量浓度为170～190 g/L,底流液固质量比为2.5～3.0,底流附液Na2O质量浓度为6～9 g/L,平均分离洗涤效率在99%以上,平均二次反应损失为0.16%;烧结法赤泥的流态化分离洗涤是抑制二次反应的有效途径。

The simultaneous separation and washing of red mud of the leached slurry with high alumina concentration in the sintering process was studied by employing the fluidization technique.The results show that the separation and washing of red mud can be achieved at the same time by fluidization method.When Al2O3 mass concentration of the leached slurry is 240-270 g/L,Na2O mass concentration of the underflow liquor and the liquid-solid mass ratio of the underflow can reach 6-9 g/L and 2.5-3.0,respectively,and Al2O3 mass concentration of the overflow is 170-190 g/L.The average efficiency of separating-washing is more than 99% with the average secondary reaction loss of 0.16%.It can be concluded that the fluidized separating-washing of red mud is an effective way to restrain secondary reactions.