跳汰中煤深度磨矿解离与组合药剂强化浮选试验研究

Experimental study on enhancement of flotation of jig middling through in-depth grinding liberation and use of compound reagent

炼焦中煤的解离再选对于回收稀缺炼焦煤资源的意义重大。以鹤壁煤电股份有限公司某炼焦煤选煤厂的跳汰中煤为试验对象,通过深度磨矿解离与组合药剂复合强化浮选开展中煤再选试验研究。结果表明:跳汰中煤破碎至<0.5mm后,煤样中连生体较多且合适粒级占比较低;最佳磨矿时间为3 min,对应的浮选精煤产率在各磨矿时间中最高,相应磨矿产品中<0.074 mm粒级的产率为66.22%;捕收剂1600三元及起泡剂Q7用量分别为500g/t和150g/t时浮选指标最佳,通过一粗一精的工艺流程可获得产率为53.83%、灰分为10.25%的精煤,实现了跳汰中煤的高效解离再选。

Recleaning of liberated coking coal middling is of great significance for the recovery of scarce coking coal resource.The jig middling produce by a coking coal preparation plant under Hebi Coal and Electricity Co.Ltd.is taken as the object to conduct the experimental study on enhancement of flotation of the middling through in-depth grinding liberation and use of compound reagents.As shown by study results,with the middling crushed down to a size of<0.5 mm,it contains a higher proportion of interlocked grains and lower proportion of suitable sizes of particles;at an optimum grinding time of 3 minutes,a maximum corresponding yield of flotation concentrate can be obtained while the yield of the<0.074 mm sizes in the ground product is as high as 66.22%;with the use of 1600 ternary collector and Q7 frother at a respective dosage of 500 g/t and 150 g/t,the optimal flotation indices can be expected;and through one roughing and one cleaning processes,the concentrate with a yield of 53.83% and an ash of 10.25% can be produced,well demonstrating the effectiveness of recleaning of jig middling after it is thoroughly liberated through deep grinding.