Abstract
Purification and thickening tests of metallurgical industrial wastewater from sintering dust dechlorination unit were carried out. Raw wastewater of pH 6.95 consisted primarily of Zn2+, Pb2+, Cd2+, Tl+, Cl-, SO4-2, at concentrations of approx. 3,200; 60; 11,500; 100; 40,100 and 5,300 mg/dm3 respectively. The heavy metals removal consisted in chemical precipitation and sedimentation, firstly by sodium hydroxide, and secondly by sodium sulphide solutions resulting in average removal to levels below 1mg/dm3. Moreover, the experimental studies of evaporation process confirmed the possibility of chloride ions reducing, the distillate yield was approx. 80% of the initial effluent stream. The solid product obtained by two-stage evaporation was characterized by satisfactory purity. The results indicate maturity of the applied processes for wastewater treatment, allowing conditions close to zero-liquid-discharge to be achieved.
Highlights
Wastewater containing high concentrations of heavy metals, chloride and sulphate ions comes mainly from mining, the smelting industry, plating processes or pigments, as well as manufacture of alloys and batteries
Smelting Process is performed in Huta Cynku “Miasteczko Śląskie” S.A
The investigated wastewater was a raw effluent produced in a dechlorination unit in the plant operation with oxides used as the raw material
Summary
Wastewater containing high concentrations of heavy metals, chloride and sulphate ions comes mainly from mining, the smelting industry, plating processes or pigments, as well as manufacture of alloys and batteries. The zinc and lead production using the Imperial. Smelting Process is performed in Huta Cynku “Miasteczko Śląskie” S.A. The primary raw materials used for the production of zinc and lead ores are concentrates, while the secondary raw material is scrap from zinc alloys. Depending on the raw material used, production is carried out as a sulphide or oxide campaign. The main sources of wastewater are the wet gas treatment process and the slag granulation processes. Additional streams are rain water, cooling water and other process waters containing toxic heavy metals
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