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首页> 外文期刊>International journal of water resources development >Recovery of Drinking Water and By-products from Gold Mine Effluents
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Recovery of Drinking Water and By-products from Gold Mine Effluents

机译：从金矿废水中回收饮用水和副产物

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South Africa is a water constrained country with a large mining industry. Effluents from the mining industry, which is rich in calcium sulphate, resulted in salination of the limited amount of surface water. South Africa is also a large importer of sulphur because it is required for the manufacture of sulphuric acid. It is argued that importation of sulphur can be replaced by recovering it as a by-product during treatment of sulphate-rich effluents. The removal of acid, metals and sulphate from mine water was assessed using the CSIR ABC (Alkali-Barium-Calcium) Desalination process. The CSIR ABC Desalination process was used for neutralization and removal of the total dissolved solids content from 7600 to 400 mg/l. Metals were removed effectively through precipitation with CaS or Ca(HS)_2. The latter compound had a high solubility with higher metal removal rates compared to CaS. Sulphate remained in solution during metals precipitation with sulphide. The rate of sulphate removal during gypsum crystallization was influenced by the gypsum seed crystal content. The rate of sulphate removal during BaCO_3 treatment was influenced by pH, CaCO_3 solids and BaCO_3 solid concentration. Ca(HS)_2 was produced from CaS by passing CO_2 through a CaS slurry. Further CO_2 additions resulted in H_2S-stripping. BaSO_4 and CaCO_3 were converted simultaneously to BaS and CaO, respectively. The optimum temperature was 1050℃. The cost of raw materials for the treatment of water with a TDS content of 7 600mg/l amounted to R2.21/cubic metre (m~3). The potential value of the water and by-products amounted to R11.10/m~3 (US$1.00 = ZAR7.60).
机译：南非是一个水资源有限的国家，拥有庞大的采矿业。来自采矿业的废水富含硫酸钙，导致盐分有限的地表水盐化。南非还是硫磺的主要进口国，因为它是制造硫酸所必需的。有人认为，可以通过在富硫酸盐废水处理过程中将其作为副产品回收来代替硫的进口。使用CSIR ABC（碱-钡-钙）脱盐工艺评估了矿井水中酸，金属和硫酸盐的去除情况。 CSIR ABC脱盐工艺用于中和并去除7600至400 mg / l的总溶解固体含量。通过用CaS或Ca（HS）_2沉淀有效去除了金属。与CaS相比，后一种化合物具有较高的溶解度和较高的金属去除率。在金属硫化物沉淀过程中，硫酸盐保留在溶液中。石膏结晶过程中硫酸盐的去除速率受石膏晶种含量的影响。 BaCO_3处理期间硫酸盐的去除速率受pH，CaCO_3固体和BaCO_3固体浓度的影响。通过使CO_2穿过CaS浆料，由CaS生成Ca（HS）_2。进一步的CO_2添加导致H_2S汽提。 BaSO_4和CaCO_3分别同时转化为BaS和CaO。最佳温度为1050℃。 TDS含量为7 600mg / l的水处理原料的成本为R2.21 /立方米（m〜3）。水和副产品的潜在价值总计为R11.10 / m〜3（1美元= 7.60 ZAR）。

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