新疆滴水低品位氧化铜矿常温氧化氨浸工艺研究

以新疆滴水低品位氧化铜矿为研究对象, 在(NH₄)₂SO₄-NH₃浸出体系中分别考察了磨矿细度、浸出时间、总氨浓度、氧化剂用量、NH₄⁺∶NH₃比率等因素对铜浸出率的影响。最终确定最佳工艺条件为 磨矿细度-0.074 mm粒级占86%, 反应温度25 ℃, 搅拌转速200 r/min, 一段浸出液固比2∶1, 过硫酸铵0.15 mol/L, 氨水浓度3 mol/L, 硫酸铵浓度1.5 mol/L, 搅拌浸出1.5 h, 静置0.5 h；二段过硫酸铵、氨水和硫酸铵添加用量减半, 继续搅拌浸出1.5 h, 静置0.5 h；三段浸出药剂用量与二段浸出相同, 搅拌浸出2 h, 静置4 h完毕。该条件下, 可获得铜浸出率大于86%的优良指标。

Research on Oxidative Ammonia Leaching at Room Temperature for a Low-grade Copper Oxide Ore from Xinjiang

With low-grade copper oxide ore from Dishui county of Xinjiang Uygur Autonomous Region as raw material, factors affecting copper leaching in (NH₄)₂SO₄-NH₃ system including grinding fineness, leaching time, total ammonia concentration, oxidant dosage, and ratio of NH₄⁺∶NH3 were all investigated, resulting in the following optimal condition for leaching process, including a grinding size of -0.074 mm 86%, reaction temperature of 25 ℃, stirring at the speed of 200 r/min, solid/liquid ratio at 2∶1 for 1^st-stage leaching with concentrations of ammonia, ammonium sulfate and ammonium persulfate at 3 mol/L, 1.5 mol/L and 0.15 mol/L, respectively, agitation leaching for 1.5 h followed by 0.5 hour's standing, then with addition of ammonia, ammonium sulfate and ammonium persulfate for the 2^nd-stage of leaching at half of previous stage, repeating agitation leaching for 1.5 h followed by 0.5 hour's standing, and the dosage of reagent in the 3^rd-stage leaching the same as the 2nd-stage, agitation leaching for 2 h followed by 4 hour's standing. After the whole process, the leaching rate of copper can finally exceed 86%.