矿山酸性废水处理高密度泥浆法及辅助沉降协同试验研究

Synergistic study on high density sludge process and auxiliary settlement method in treatment of acid mine drainage

针对某矿山含铜含氰酸性废水,采用高密度泥浆法底泥回流及金选厂炭浸尾矿渣浆辅助沉降综合协同试验,进行了絮凝剂选型及用量、底泥回流、添加金选厂炭浸尾矿增加固含量来提高浓密沉降效果等一系列试验研究。试验结果表明:在应用高密度泥浆法同时,协同添加炭浸尾浆辅助沉降时体系固含保持在1%~2%较为适宜,当体系固含从1%增加到2%时(底流全部回流),絮凝沉降半小时后,上清液总铜浓度从0.227mg/L降低到0.162mg/L;当体系固含2%(底流按固含1.5%回流,剩余固含0.5%由新炭浸浆补充)时,絮凝沉降半小时后,上清液总铜浓度为0.150mg/L。当体系固含量2%,絮凝剂DRYFLOC23E用量为2mg/L时,底流部分回流在底流按固含1.5%回流加0.5%由新炭浸浆补充的时候,出水水质的总铜浓度、达标稳定性、沉降效果总体指标最佳。

Synergistic tests of high density sludge process and auxiliary settlement with gold mine carbon leaching process tailings method in treatment of acid mine drainage containing cyanide and copper in a mine were carried out.The selection and dosage of flocculant,the reflux of sediment,and the addition effects of increasing the solid content by addition of gold mine tailings were conducted.The results show that when the solid content of is 1%~2%and increases from 1%to 2%(all underflow is refluxed),the total copper concentration of the supernatant decreases from 0.227 mg/L to 0.162 mg/L after flocculation for half an hour,while the system contains 2%solid content(including 1.5%reflux and the remaining 0.5%replenished by adding carbon leaching process tailings),the total copper concentration of the supernatant is 0.150 mg/L after flocculation for half an hour.The overall effect is the best when solid content of the system is 2%(including 1.5%reflux and 0.5%replenished by carbon leaching process tailings),and flocculant DRYFLOC23 Eis chosen at 2 mg/L,resulting in total copper concentration stably meeting discharge standard requirements with best flocculation sedimentation.