改性煤矸石去除凡口铅锌矿选矿废水中硫化物

以韶关市某废弃煤矿的煤矸石为主要原料制备了改性煤矸石A、改性煤矸石B、改性煤矸石C。用这3种改性煤矸石及未改性煤矸石进行去除凡口铅锌矿选矿厂外排废水中硫化物的实验室试验，结果表明：改性煤矸石A具有最强的硫离子去除能力；适宜的除硫工艺条件为常温、废水pH值保持原值、煤矸石投加量2.0 g/L、搅拌速度300 r/min、反应时间60 min。根据实验室试验结果，采用改性煤矸石A在凡口铅锌矿试验厂进行去除选矿外排废水中硫化物的半工业试验，硫离子的去除率达到87.5%以上，处理后废水的硫离子浓度降到0.42 mg/L以下，符合国家和广东省排放标准。

Removal of Sulfide from Mineral Processing Wastewater of Fankou Lead-zinc Mine by Modified Coal Gangue

With the waste coal gangues of an abandoned coalmine in Shaoguan as the main raw materials, the modified coal gangues A, B, C were prepared. These three modified gangues together with the unmodified gangues are used to make laboratory tests for removal of sulfide from the wastewater of Fankou Lead-zinc Concentrator. The results showed that the modified gangue A has a higher ability to remove the sulfide and the appropriate conditions for sulfide removal include the room temperature, the original pH value of wastewater, the gangue dosage of 2.0 g/L, stirring speed at 300 r/min and reaction time for 60 min. According to the results of laboratory tests, modified coal gangue A was adopted into the pilot plant tests to remove sulfide from the beneficiation wastewater in Fankou Lead-zinc Mine. By this method, the removal rate of sulfide reached above 87.5%, and the concentration of sulfide dropped to 0.42 mg/L below, which meet the national and Guangdong Provincial discharging standard.