臭氧氧化法处理含氰尾渣的试验研究

夏家店金矿采用炭浆法浸出回收金，其氰化尾渣中-0.037 mm粒度达60%，硫化铁矿物含量低于1%，残留氰化物以游离氰为主。为使破氰尾渣中的氰化物含量满足回填利用要求，开展了固液分离洗涤法、过氧化氢氧化法、臭氧氧化法破氰效果对比试验。结果表明，三种方法的破氰效果好坏依次为:臭氧氧化法>过氧化氢氧化法>固液分离洗涤法。将含氰尾矿浆pH值调至8，采用臭氧浓度35.1 mg/L，臭氧流量1 L/min，破氰时间45 min，尾渣总氰含量由10 mg/kg降低至0.88 mg/kg，尾渣浸出毒性指标满足规范回填利用要求。 

Experimental Study on the Treatment of Cyanide-containing Tailings by Ozonation

In Xiajadian gold mine, the particle size of -0.037 mm is 60%, the content of iron sulfide mineral is low 1%, and the cyanide residue is mainly free cyanide. In order to make the cyanide content in the cyanide-broken tailings meet the requirement of backfill utilization, a comparative test on the cyanide-broken effects of solid-liquid separation washing, hydrogen peroxide oxidation and ozone oxidation was carried out according to the characteristics of the cyanide-containing tailings of Xiajiadian gold mine. The results showed that the three methods of cyanide breaking effect is good or bad in order: ozone oxidation > hydrogen peroxide oxidation >lid-liquid separation washing method. When the pH value of cyanide-containing tailing pulp is adjusted to 8, the ozone concentration is 35.1 mg/L, ozone flow rate is 1 L/min, and cyanide-breaking time is 45 min, the total cyanide-containing content of tailings can be reduced from 10 mg/kg to 0.88 mg/kg, and the toxicity index of tailings can meet the requirements of standard backfill utilization.