Leaching of Copper and Other Metal Impurities from a Si-Sludge Using Waste Copper Nitrate Solution

실리콘 슬러지로부터 폐질산구리용액을 이용한 구리 및 금속불순물의 침출

Jun, Minji;Srivastava, Rajiv Ranjan;Lee, Jae-chun;Jeong, Jinki

  • Received : 2016.03.08
  • Accepted : 2016.04.22
  • Published : 2016.06.30


A fundamental study to recycle a Si-Sludge and waste copper nitrate solution acid solution generated by domestic electronic industries was carried out. The waste copper nitrate solution was used as the lixiviant to leach the metals like Cu, Ca, Fe, etc. from the sludge leaving Si in the residues. The effect of reaction temperature, time and pup density on the metals leaching from the sludge was investigated. To enhance the extractability of Fe, the effect of HCl, $HNO_3$ and $H_2O_2$ introduced additionally during the leaching was also examined. Considering the leaching efficiency of Fe along with Cu, the leaching conditions comprising of 200 ~ 225 g/L pulp density and $90^{\circ}C$ temperature for 30 min were optimized. Under this condition, 98.27 ~ 99.17% Cu could be dissolved in the leach liquor with the obtained purity of Si in the residues as 98.69 ~ 98.86 %. The study revealed that the leaching of Cu contained in the Si-Sludge with the waste copper nitrate solution is a plausible approach by which the obtained leach liquor can further be treated suitably to recover Cu as the high pure value-added products.


Si-Sludge;Waste copper nitrate solution;Copper;Leaching;Recycling


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