选煤厂难沉降煤泥水原因分析及对策

Analysis and measurement of slime water with difficult subsidence in coal preparation plant

为了处理难沉降煤泥水,以同煤集团选煤厂高灰细粒度煤泥水处理为研究对象,通过对选煤生产过程中高灰细粒度煤泥水难沉降的主要成因、关键影响因素、水质和矿物组成的变化规律等诸多方面的系统分析,研究了煤泥水的凝聚特性和各主要因素对煤泥水絮凝沉淀的影响,找到了处理同煤集团难沉降煤泥水的对策。结果表明:通过增设混合反应池、降低浓缩池去除负荷、延长浓缩池水力停留时间、对煤泥水进行调质、采用双性+阳性有机高分子絮凝剂联合加药等措施后能将难沉降煤泥水处理到闭路循环的水质要求。

In order to deal with the difficult sedimentation slime water, high ash fine-grained slime water treatment in coal preparation plant of Datong Coal Mine Group is adopted as the object of this study. The main factors, variation of water quality and mineral composition of high-ash fine-grained slime water during coal preparation were introduced. The influence of main factors on the flocculation and sedimen- tation of coal slime water was studied, and the measurements to solve the difficult settling coal slime water were proposed. The results show that the water quality requirements of the slime water with difficult subsidence is improved to be closed circuit circulation by adding a mixed reaction tank, reducing the concentration of the pool to remove the load, extending the length of the thickened pool hydraulic reten- tion time, the slime water conditioning, amphiphilic and positive organic polymer flocculant dosing and other measurements.