废旧线路板次氯酸盐法浸金的实验研究
Experimental research of leaching gold from waste printed circuit board by sodium hypochlorite method
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摘要: 研究了酸性条件NaClO-HCl和碱性条件NaClO-NaOH下浸出废旧线路板中的金。通过正交设计优化实验比较发现，NaClO-NaOH碱性体系浸金较有优势，其最佳的浸金条件为NaClO浓度6 mol/L，NaOH浓度8 mol/L，固液比1∶6，反应时间40 min，金的浸出率可达到94.5%。次氯酸盐浸金具有浸金效率高，无污染，材料价廉易得等优点，是一种具有环境友好型的浸金技术。Abstract: The leaching gold experiment under the acidic condition of sodium hypochlorite-hydrochloric acid and alkakine condition of hypochlorite-sodium hydroxide was designed to recover gold from waste printed circuit board. Through orthogonal experiment anslysis, the result showed that leaching gold of hypochlorite-sodium hydroxide method had more advantages. The best leaching alkaline conditions were the NaClO concentration of 6 mol/L, NaOH concentration of 8 mol/L, solid/liquid ratio of 1∶6, reaction time of 40 min. Under these conditions, the average rate of leaching gold reached 94.5%. In summary, the sodium hypochlorite method has the advantages of high-efficiency, non-pollution,and low-cost. Thus, the sodium hypochlorite method was an environmental friendly technology of leaching gold.
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