某微细粒级混磁精矿载体浮选试验研究

Experimental Study on Carrier Flotation of a Fine-Grained Magnetic Separation Mixed Iron Concentrate

微细粒矿石由于其比表面积大、表面能高、体积及质量小等特征导致浮选过程颗粒之间发生非选择性团聚现象,进而会恶化浮选环境,使常规泡沫浮选难以获得良好指标。针对东鞍山烧结厂重磁车间产品进行了载体浮选试验研究,其中重精筛下产品作为载体矿物,混磁精矿为黏附矿物。试验结果表明:在粗选NaOH调pH值11.50、浮选温度35.0℃、CaO用量700 g/t、淀粉用量1 200 g/t、TD-Ⅱ用量500 g/t,精选TD-Ⅱ用量250 g/t条件下,经过1粗1精3扫反浮选闭路流程后,与常规浮选相较,载体浮选指标得到了改善,精矿TFe品位提高了1.12个百分点。对其产品粒度分析表明:载体浮选精矿产品中-20μm粒级含量显著降低,累计体积曲线峰呈现出向粗粒级移动的趋势,并且强度下降,载体浮选矿物表观粒度增加,优化了浮选环境。

Due to its large specific surface area,high surface energy,small volume and small mass,the fine-grained ore causes non-selective agglomeration among particles,which deteriorates the flotation environment and makes it difficult to obtain favourable indicators for conventional froth flotation. For East Anshan Sintering Plant the carrier flotation test study on Magnetic Plant samples,including gravity concentrate fine undersize as carrier minerals,mixed magnetic concentrate as ad?hesion minerals,the experimental results show that the pH value of 11.50,the flotation temperature of 35.0 ℃,CaO dosage of 700 g/t,starch dosage of 1 200 g/t,TD-Ⅱdosage of 500 g/t,and TD-Ⅱdosage of 250 g/t for cleaning,after the reverse flo?tation closed process of one roughing,one cleaning,three scavenging,the carrier flotation index was improved compared with the conventional flotation significantly,and the concentrate grade increment was improved by 1.12 percentage points.The particle size analysis of the product showed that the content of-20 μm in the carrier flotation concentrate product was re?duced significantly,the cumulative volume curve peak showed a tendency to move to the coarse grain level,and the strength decreased,the apparent particle size of the mineral increased,and the flotation environment was optimized.