常村煤矿选煤厂技术改造可行性分析

Feasibility analysis of technical transformation in Changcun coal preparation plant

为提高选煤厂处理能力,增加精煤产率,分析了常村煤矿选煤厂原煤粒度组成及可选性,确定了选煤厂产品结构,以新老系统搭接合理、便捷为原则,制定了选煤方法及工艺流程。原煤属于中高灰、特低硫煤;原煤各粒级分布较为均匀,煤软、矸石硬,矸石不易碎。原煤具有低密度物含量高、灰分低,中间密度物含量低,高密度物含量高、灰分高的特点,有利于重力分选;原煤可分选出低灰精煤产品和纯度很高的矸石。结合选煤厂原煤性质及产品结构,确定选煤工艺为:<50 mm原煤选前脱泥(1 mm)跳汰+TBS分选+浮选工艺以及<50 mm原煤选前脱泥(1 mm)无压三产品重介质旋流器分选+TBS分选+浮选工艺。改造后选煤厂精煤产率得以提高,循环水水质明显改善,保证了跳汰选煤的正常运行。

In order to improve processing capacity and clean coal yield of Changcun coal preparation plant,the raw coal size composition and washability were analyzed. The products structure,separation method and process were determined following the principle of reasona-ble matching of original and new system. The raw coal was high-medium ash,ultra-low sulfur coal type,the size fraction was evenly dis-tributed and the gangue was hard. The low-density and high-density materials content in raw coal were high,the ash of above materials both were proportional to the density. The medium-density material was low. So the gravity separation was suitable for the raw coal. The products were high-ash clean coal and high-purity gangue. Based on the raw coal properties and products structure,two preparation processes were determined. One process was that -50 mm raw coal was deslimed using jigging method first,then separated with TBS,at last flotation. The other process was that -50 mm raw coal was deslimed using three-product dense medium cyclone,then separated with TBS, at last flotated. The transformation improved clean coal yield and circulating water quality,meanwhile make the jigging process run well.