悬浮物特征对砂加载混凝沉淀处理高悬浮矿井水实验的影响

Effect of Suspended Matter Characteristics on Coagulation Treatment of High Suspended Mine Drainage

高悬浮物矿井水高效快速处理是解决西部六省区煤炭资源化合理利用的关键。关于原水中悬浮物特征对石英砂加载混凝沉淀效果的影响则很少有系统的研究,影响机制也不清晰。为此,选用石英砂加载混凝处理陕西小保当煤矿典型高悬浮矿井水为研究对象,分析矿井水中悬浮物的粒径、煤岩比和初始负荷大小对石英砂加载混凝处理高悬浮物矿井水效率的影响。矿井水中悬浮物的粒径、煤岩比和初始负荷大小对石英砂加载混凝处理高悬浮物矿井水效率和沉降速度的影响明显。通常,混凝沉淀的去除效率和沉降速度随矿井水中悬浮物的粒径而显著升高,但当悬浮物的粒径过低(小于0.075 mm)后,沉降速率和去除效率明显降低。矿井水悬浮物的初始负荷过高(高于10 000 NTU)和过低(低于500 NTU)都会降低混凝去除效率和沉降速度。矿井水悬浮物中煤粉质量含量越高,砂加载混凝处理效率越低。该结果为有效提升砂加载混凝工艺的运行成效,缓解中国西部矿区水资源短缺的矛盾,同时对中国煤炭行业的绿色发展和矿区生态文明建设也具有重要的意义。

Efficient and rapid treatment of mine drainage with high suspended solids is the key to utilize and protect coal resources in western provinces,China.However,few systematic studies on the effect of suspended matter characteristics on coagulation treatment of high suspended mine drainage.Therefore,the typical high suspended mine water in Xiaobaodang Coal mine was selected to analyze the effect of particle size,coal-rock ratio,and suspended solids loadings on the efficiency of high suspended matter mine water treated by loading coagulation with sand.Generally,the removal efficiency and velocity of coagulation increase significantly with the particle size of suspended solids in mine water,but when the particle size of suspended solids was less than 0.075 mm,the removal efficiency and velocity decreased significantly.The suspended solids loadings were more than 10000 NTU and less than 500 NTU,which reduced the coagulation removal efficiency and velocity.The higher the mass content of coal in mine water,the lower the removal efficiency of coagulation.The results can effectively improve the operation technology of the sand loading coagulation,relieve the contradiction of water shortage,and develop coal industry and ecological civilization construction in western mining area.