云南某胶磷矿碎磨系统增产降耗试验研究

云南某磷矿选矿厂生产规模为200万t/a,为了提高企业核心竞争力需要采取扩能降耗的措施。首先通过小型试验的手段进行研究,发现通过减小入磨粒度和采用钢球作为磨矿介质可以改善磨矿效果,提高磨矿效率;然后通过工业试验进行验证,也证实了减小筛孔尺寸后,改变了磨矿分级系统中各产品的粒度分布,在维持钢球作为磨矿介质的条件下,磨矿产能提高了28.80%。磨矿产品经过浮选后获得了P_2O_5品位为29.81%,P_2O_5回收率为85.53%,MgO含量为1.32%的磷精矿,浮选指标良好且能够满足生产要求。对现场碎磨流程进行技改后,磨矿单耗降低了17.64%,节能降耗效果显著。

Experimental study on increasing production and reducing energy consumption of crushing and grinding systems for a collophanite mine in Yunnan Province

A flotation plant for treating phosphate ore in Yunnan Province has a throughput of 2 million T/a. It is very motivated that the core competitiveness of enterprises was improved by increasing production and reducing energy consumption. The experiments were performed at a lab and the results proved that the grinding performances and efficiency were improved by using steel ball as grinding medium and by decreasing the particle size of feeding to the grinding. Based on the results obtained at a lab, tests were carried out in the plant. The results showed that the size distribution ratios were obviously changed and the grinding capacity increased by about 28.80% using the steel ball as grinding media. The grade of P2O5 and MgO in the concentrate reached 29.81% and 1.32% respectively, in the subsequent flotation operation, and the recovery of P2O5 was 85.53%. The obtained concentrate could meet the production requirements. After the technical reformation, the unit power consumption of grinding is reduced by about 17.64%, which indicated that the performance of reducing energy consumption was obvious.