某黄金矿山尾矿库氰渣淋溶废水沉铜试验研究

Experimental study on copper precipitation in leaching liquor of cyanidation slag in one tailings reservoir of gold mine

采用长春黄金研究院自制的沉铜混凝剂CCG001与目前常用的混凝剂PAC、PFS、PFC、FAFC、Al2(SO4)3、FeSO4进行试验比较,得出CCG001在混凝沉铜上具有相对优势。以CCG001和APAM为混凝剂,对某黄金矿山尾矿库氰渣淋溶液进行了一系列混凝沉铜试验。在单因素试验基础上,以pH值和混凝剂投加量为影响因素,以铜离子和COD去除率为响应值,采用BBD试验设计和响应面法建立了铜离子和COD去除率的响应面方程。通过对数学模型进行求解得知,在pH值为9.99、CCG001用量为205.22 mg/L、APAM投加量为3.32 mg/L的条件下,铜离子和COD去除率可同时达到最大值,分别为96.95%和83.24%。验证试验结果表明:响应面法的预测值与试验值吻合较好,建立的模型具有较高的可信度;响应面法是一种有效地优化废水混凝条件的方法。

This paper adopts the self-made coagulant CCGO01 by Changchun Gold Research Institute to comparatively experiment with the coagulants of PAC, PFS, PFC, FAFC, A12 （ SO4 ） 3 and FeSO4, CCG001 has better perform- ance. A coagulation-flocculation process was used to treat the leaching liquor of cyanidation slag in tailings reservoir of a certain gold mine with CCG001 as coagulant and anionic polyacrylamide （APAM） as floeculant. Based on the result of single factor experiments, response surface formula of copper ion and COD removal rate is established using BBD design and response surface methodology with pH value and dosage of coagulants as influencing factor and COD removal rate as response value. The optimal conditions obtained from mathematical calculation were pH value of 9.99, CCGO01 dosage of 205.22 mg/L, and APAM dosage of 3.32 mg/L respectively. Under the optimal conditions, the maximal copper ion removal rate （96.96 % ） and the maximal COD removal rate （83.24 % ） could be achieved. The RSM was demonstrated as an appropriate approach for the optimization of the eoagulation-floceulation process with consistent predicted value and experimental value, and persvasive establishment of models.