甘肃某铅锌矿选厂废水净化与回用试验

Study on Purification and Recycling of Dressing Wastewater from a Lead-zinc Plant of Gansu

为了解决甘肃某铅锌矿选矿废水的循环利用问题,探索了自然净化处理的效果,比较了不同絮凝剂的沉淀效果,在研究确定了聚丙烯酰胺(PAM)最佳净化参数的基础上,进一步研究了活性炭再处理的工艺参数,最后比较了净化前后废水和自来水分别处理矿石时的产品指标。结果表明:1选矿废水经PAM絮凝+活性炭吸附工艺处理,水质明显改善。其中固体悬浮物减少81.43%;CODCr降幅高达74.56%;金属离子中Cu2+去除率达90.16%,Pb2+、Zn2+、Fe3+去除率高达93%以上。2采用净化后的废水处理矿石,其铅精矿、锌精矿指标明显优于用未经处理的废水生产的指标,与用自来水生产的指标差异很小。因此,用PAM絮凝+活性炭净化后的废水回用生产完全可行。

In order to solve the cyclic utilization problems on waste water in a lead zinc plant in Gansu,effect of natural purification treatment was explored,and the influences of different flocculants on the treatment efficiency of waste water are contrasted. Further study on the process parameters of activated carbon reprocessing was conducted based on the optimum process parameters using PAM,finally,the product index of treatment using wastewater both before and after purification and the tap water was compared. The results show that①water quality improvement significantly by using PAM flocculation＋acti-vated carbon adsorption to treat wastewater,the reduction of solid suspended solids was 81. 43%;the CODCr reducing rate is 74. 56%;the Cu2＋reducing rate is 90. 16% and Pb2＋,Zn2＋,Fe3＋removal rate was up to 93%;②treatment of ore by using pu-rified wastewater,the indexes of lead concentrate and zinc concentrate were better than those of untreated wastewater,with the use of tap water production indicators have small differences. So,the purified wastewater return to production is completely fea-sible.