Abstract

Ore-washing sludge is a typical solid waste from metallurgical industry and needs proper treatment. For the first time, this kind of sludge was used as a stabilizer for heavy metal-contaminated kaolin. As a result, after Cu (3655 mg/kg) and Cr (430 mg/kg)-polluted kaolins were mixed with the stabilizer, only 7.98 ml/L of Cr and 8 mg/L of Cu were leached by the toxicity characteristic leaching procedure. These values were both lower than the limits for the leaching of chromium and copper (GB5085.3-2007). In a column leaching test, only 2.52 mg/L of Cr and 18.51 mg/L of Cu were detected in the leachate when the pH of the leaching solution was lower than 5.6. After the stabilizer was used in Cu/Cr stabilization, it showed solid phases of oxides, hydroxides, and layered double hydroxides. After detailed calculations, oxides in the stabilizer accounted for 54.82% of Cu and Cr stabilizations. Specifically, O-top sites in oxides played a main role in stabilizing Cu and Cr. Therefore, this work will help in the development of high-value-added utilization of solid waste, as well as the remediation of acidic and heavy metal-contaminated soils.

中文翻译：

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洗矿污泥在铬（Ⅲ）和铜（Ⅱ）污染土壤修复中的应用及机理

摘要

洗矿污泥是冶金工业中的典型固体废物，需要适当处理。这种污泥首次被用作重金属污染的高岭土的稳定剂。结果，将铜（3655 mg / kg）和铬（430 mg / kg）污染的高岭土与稳定剂混合后，通过毒性浸出仅浸出7.98 ml / L Cr和8 mg / L Cu。程序。这些值均低于铬和铜的浸出极限（GB5085.3-2007）。在柱浸出试验中，当浸出溶液的pH值低于5.6时，渗滤液中仅检测到2.52 mg / L的Cr和18.51 mg / L的Cu。在将稳定剂用于Cu / Cr稳定化后，它显示出氧化物，氢氧化物和层状双氢氧化物的固相。经过详细的计算，稳定剂中的氧化物占Cu和Cr稳定度的54.82％。具体而言，氧化物中的O-top位置在稳定Cu和Cr中起主要作用。因此，这项工作将有助于发展固体废物的高附加值利用，以及对酸性和重金属污染土壤的修复。