白银冶炼厂工业废水治理及其利用

一、概述 白银有色金属公司第一冶炼厂,为我国早期建成的大型铜冶炼厂,同时生产硫酸等多种产品。厂内除冶炼外尚包括制酸、电解及综合利用车间。白银冶炼厂所排放的工业废水主要是含酸浓度较低的酸性废水及含酸浓度较高的污酸液。由工业废水中每年要排

Studies on Treatment of Baiyin Smelter Proeess Dffluent Its Utilization

Bciyin Smelter is a large-scale copper smelter built in early 1950s. The metallurgical gas from the Smelter is utilized to produce sulphuric acid and other products. the waste process effluents contain a lot of acid, arsenic, copper bismuth, lead, selenium and mercury etc, which are mainly concentrated in the effluents obtained from scrubbing of acid making gas. The acidic effluem with a high content of arsenic and copper is not only very harmful to the lower reaches of the river, bin also causer, big loss of valuable material.It is showed through studies that the sulphide agent (sodium sulfhydrate and sodium sulphide solution oi S²⁺-containing waste solution), in the presence of acid, can be directly added to precipitate mercury, copper md ar-senic in the form of sulfides for recovery, also the impurities, such as lead and dust etc in the acidic effluents are settled down efficiently, so that the acidic effluents after treated, can be utilized too, for instance, for making phosphate fertilizer.Jt is indicated that by use of the multi-stage sulfidi-zation process, copper and arsenic etc could be seperaccd from the precipitate for recovery or storage. By adoption of a new equipment for sulfidizing and mixing reaction and for direct recovery of hydrogen sulfide, the treatment results arc improved, the process is simplified and less equipment is required.