矿山含铜氰废水资源化利用工艺研究

Process Study on Resource Utilization of Mine Copper-cyanide-bearing Wastewater

采用"活性炭吸附—解吸联合工艺"处理某矿山的含铜氰废水。吸附阶段考察了吸附液pH和吸附方式对含铜氰废水中铜吸附率的影响,解吸阶段考察了解吸方式、时间、解吸液的硫酸和双氧水浓度对含铜炭中铜解吸率的影响。结果表明,先将含铜氰废水pH调至8左右,然后在5级串联吸附条件下吸附1.5h,铜的吸附率均稳定在90%以上,吨炭铜含量为31.4kg;所得含铜炭采用淋滤解吸,并在解吸液的双氧水和硫酸浓度分别为2g/L和3%条件下解吸7h,铜解吸率为87.60%,整个工艺铜的直收率达78%以上。

Copper-cyanide-bearing wastewater of one mine was treated by ＂ activated carbon adsorptiondesorption combined process＂.Effect of pH value of solution for adsorption and adsorption mode on copper adsorption rate in adsorption stage was investigated.Effects of desorption mode,desorption time,and concentration of sulfuric acid and hydrogen peroxide of desorption solution on copper desorption rate from activated carbon in desorption stage were investigated.The results show that copper adsorption rate stabilizes at 90%above with copper content in activated carbon of 31.4kg/t under the conditions including pH value of solution for adsorption of 8,and adsorption time of 1.5h with 5level series adsorption.Copper desorption rate from activated carbon is 87.6% under the conditions including concentration of sulfuric acid and hydrogen peroxide of 3% and 2g/L respectively,and adsorption time of 7h.Copper recovery of the whole process is 78% above.