某钨矿选矿废水处理及回用试验研究

Experimental study on treatment and reuse of tungsten ore-processed wastewater

某钨矿选矿过程中加入了大量硅酸钠和其他浮选药剂,造成了尾矿沉降缓慢,选矿废水黏度大,废水中TAs、CODCr等指标超标无法外排等问题,而且将此尾矿澄清水回用到选矿中,浮选指标严重恶化。针对此问题,本文对该钨矿选矿废水进行了脱稳除硅试验和除砷降CODCr试验,试验结果表明,“石灰沉淀-铁碳微电解-吸附材料吸附”工艺处理该钨矿选矿废水效果明显,处理后的废水后液中TAs与CODCr指标均可达到国家地表水Ⅱ类水质标准,将其返回选矿流程,选矿指标接近清水指标。

A large amount of sodium silicate and other flotation agents were added to a tungsten ore beneficiation process,which caused slow sedimentation of the tailings,large viscosity and high TAs and CODCr of the beneficiation wastewater,so the wastewater could not be discharged.If the wastwater was reused in the beneficiation process,the flotation index deteriorated severely.Aiming at this problem,this article has carried out destabilization and silicon removal tests and arsenic and CODCr removal tests on the tungsten ore-processed wastewater.The experimental results showed that the“lime precipitation-iron carbon micro electrolysis-adsorption”process can treat the tungsten ore-processed wastewater,and both the TAs and CODCr indicators in the wastewater after-treatment by this process can meet the national surface water ClassⅡwater quality standards,when the wastewater after-treatment are returned to the beneficiation process,the beneficiation indicators are close to the fresh water beneficiation indicators.