钙法钒渣熟料流态化浸出工艺研究

Study on fluidized leaching of calcified vanadium slag clinker

利用散式直管流化床进行了钙法钒渣熟料流态化浸出工艺研究,测定了熟料颗粒的粒度分布并分成7个粒级开展试验,首先计算出不同粒级下的临界速率及带出速率,考察了钒渣粒度对表观流化速率、停留时间分布以及钒浸出率的影响。结果表明,不同粒级的临界流化速率和停留时间差异较大,且存在显著的短路或者沟流现象,需分级处理,其中-39μm颗粒的浸出效果最好,尾渣残钒为0.54%,钒浸出率可达94%。

The fluidized leaching process of calcified vanadium slag clinker was studied in a particulate fluidized bed reactor.The particle size distribution of the clinker was determined and seven size fractions were divided for the experiments.The critical velocity and entrainment velocity of different size fractions were firstly calculated.The effects of clinker particle size on the apparent fluidization velocity,residence time and vanadium leaching rate were investigated.The results show that the critical fluidization velocity and residence time distribution of different particle size fractions are quite different,and there exists significant short circuit or channeling which needs to be treated by stages.The best vanadium leaching efficiency of 94%can be obtained for particles lower than 39μm,with the residual vanadium content of the tailing at 0.54%.