安家岭选煤厂末排矸系统平衡及降低介耗的途径

介绍了安家岭选煤厂末排矸系统工艺流程和设计特点。针对末排矸系统存在的系统不平衡,介耗高,处理量低,混料桶位、密度波动大,分流量大,磁选机液位不稳等问题,从改造末煤弧形筛,改造4、5系统,改造磁选机来料分配箱,完善清扫水系统,更换粉原煤弧形筛筛板和板框压滤机6个方面对安家岭选煤厂进行了技术改造。最后对选煤厂技改效果进行了分析,结果表明:技改后选煤厂介耗由2.5 kg/t降至1.2 kg/t,水耗由0.12 m3/t降至0.08 m3/t;末煤排矸发热量达到21.77 MJ/kg,吨煤售价增加200元,系统得以连续生产,中煤质量稳定;选煤厂每年节约清水20.8万m3,节约磁铁粉6760 t,全年节省磁铁矿粉费用439.4万元,经济效益显著。安家岭选煤厂技改突破了设计常规,对选煤厂生产技术管理及选煤厂设计具有很好的借鉴作用。

Research on slack coal gangue disposal system equilibrium and ways of reducing medium consumption in Anjialing coal preparation plant

Introduce technological process and design features of slack coal gangue disposal system in Anjialing coal preparation plant.In order to resolve the following problems,unstability,high medium consumption,low handling capacity,wide range of mixing material volume and density in mixing bucket,large bypass flow,unconstant liquid level of magnetic separator,transform the coal preparation plant from six aspects which are reforming fine coal sieve bend and NO.4,NO.5 system,as well as feedstock distributing box of magnetic separator,enhancing water eliminating system,replacing sieve plate of sieve bend and plate-and-frame filter press.At last,analyze the transformation effects.The results show that,the medium consumption is reduced from 2.5 kg/t to 1.2 kg/t,water consumption is from 0.12 m3/t to 0.08 m3/t,calorific capacity reaches up to 21.77 MJ/kg,the price of per ton of coal increases by 200 yuan.The system could work continuously and middlings quality is stable.The coal preparation plant saves clean water 208 thousand cubic meter and magnetic iron powder 6760 tons every year,that means,saves 4.394 million yuan which originally should be paid for magnetic iron powder.The transform is quit different from the common design,and provides a basis for manufacturing and technical management as well as coal preparation plant design.