济三选煤厂粗煤泥截粗试验

通过分析济三选煤厂煤泥水系统工艺流程,说明煤泥水桶溢流量大,超粒度物料进入压滤循环系统,离心液中大量末精煤经筛网离心机处理后直接变成煤泥混入中煤,+0.1753 mm物料进入煤泥水系统后成为产品煤泥,损失了精煤等原因造成了选煤厂煤泥水系统跑粗,提出了解决系统跑粗问题的关键在于控制煤泥水桶溢流、斗子捞坑的入料粒度及旋流器溢流。通过在煤泥水桶四周建溢流堰,增加倾斜角度的筛板,建集料桶,安装煤泥振动筛和弧形筛,将进入捞坑的所有水全部打至煤泥水桶等措施对粗煤泥回收系统进行了工艺改造。最后对选煤厂改造效果进行了分析,结果表明:选煤厂改造完成后,减少了粗颗粒进入压滤系统,减轻了煤泥水系统压力,提高了精煤产率,降低了设备事故率,每年可回收末精煤3652.11 t,创造效益189.91万元。

Transformation of slime water processing system in Jisan coal preparation plant

The analysis of slime water processing treatment in Jisan coal preparation plant shows that there are a host of causes lead to the coarse slime leakage such as the mass overflow from slime water bucket, the over-sized material into pressure filtration and circulation system. Large amounts of slack coal and clean coal in eentrifugate, after centrifuging by screen centrifuge, directly mix into middlings as slime, the coal above 0. 1753 mm leaks into slime water, that means lots of clean coal is lost. So the key to solve these problems is to control the overflow of slime water bucket and cyclone as well as the size of matericals into smudge tank. Transform the slime water processing system from the following aspects ： Add overflow weir around slime water bucket, increase angle of inclination of sieve plate, build aggregate bucket, install vibrating screen and sieve bend, recover coarse slime by pumping all the water from smudge tank into slime water bucket. The results show that, after transformation, the coarse slime is prevented from leaking into pressure filtration system, the treatment efficiency of slime water processing system and clean coal yield have increased, the accident rate has decreased. Jisan coal preparation plant recovers slack clean coal 3652. 11 tons every year,which values 1. 8991 million yuan.