高泥化煤泥水絮凝沉降试验研究

Experiment Research on Flocculation Settlement of High Muddied Coal Slurry Water

为减少选煤厂处理煤泥水的药剂用量,以煤泥水初始沉降速度和上清液透光率为考察指标,采用单因素试验优选法初步确定煤泥水沉降所需絮凝剂(相对分子质量分别为8×106和1.2×107的聚丙烯酰胺PAM)和无机凝聚剂(CaCl2和MgCl2)的合理用量范围,在此基础上对絮凝剂和无机凝聚剂用量配比进行了优化试验。结果表明:对于质量浓度为75g/L的煤泥水,当相对分子质量为1.2×107的PAM用量为6.8g/m3,CaCl2用量为350g/m3时,上清液透光率可达97.70%,初始沉降速度达22.32cm/min。

In order to reduce the dosage for the coal slurry water treatment in the coal preparation plant,taking the initial settlement speed of the coal slurry water and the light transmittance of the top clean liquid as the investigation indexes,the single element experiment optimized method was applied to preliminarily determine the rational dosage limits of the flocculant（the polyacrylamide PAM with the relative molecule 8 millions and 12 millions individually） and the inorganic coagulant（CaCl2 and MgCl2） required for the coal slurry water settlement.Based on the circumstances,an optimized experiment was conducted on the dosage match rate of the flocculant and the inorganic coagulant.The results showed that as for the the coal slurry water with the quantity density of 75 g/L,the PAM dosage with the relative molecules of 12 millions was 6.8 g/m3,the CaCl2 dosage was 350 g/m3,the light transmittance of the top clean liquid would be 97.70% and the initial settlement speed would be 22.32 cm/min.