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首页> 外文期刊>Separation and Purification Technology >Influence of NH4HF2 activation on leaching of low-grade complex copper ore in NH3-NH4Cl solution
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Influence of NH4HF2 activation on leaching of low-grade complex copper ore in NH3-NH4Cl solution

机译：NH4HF2活化对NH3-NH4CL溶液中低级复合铜矿浸出的影响

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In this study, the influence of NH4HF2 activation on the leaching of low-grade complex copper ore in NH3-NH4Cl solution was studied. The related thermodynamic, optimization, and kinetic studies were investigated by an exponential computation method, orthogonal tests, and shrinking core model, respectively. The results indicate that NH4HF2 can react with Fe2O3, SiO2 and Al2O3, and the concentration of NH4HF2 is the crucial factor on the digestion of the gangues combined with copper oxides. The optimum leaching conditions were established as 3 mol/L NH4Cl, 2.5 mol/L. NH3 center dot H2O, 1 mol/L, NH4HF2, 10 mL/g liquid to solid ratio, 60 degrees C, and 3 h. Under the conditions, the leaching efficiency of copper was 89.39%. The leaching process is controlled by the diffusion of reactants across product layer, and the activation energies corresponding to 0, 0.1, 0.3, and 0.5 mol/L NH4HF2 were calculated as 27.9, 19.8, 30.7, and 32.6 kJ/mol, respectively. (C) 2017 Elsevier B.V. All rights reserved.
机译：在该研究中，研究了NH4HF2活化对NH 3-NH4Cl溶液中低级复合铜矿浸出的影响。通过指数计算方法，正交试验和缩小核心模型研究了相关的热力学，优化和动力学研究。结果表明，NH 4 HF 2可以与Fe 2 O 3，SiO 2和Al 2 O 3反应，NH 4 HF 2的浓度是与氧化铜结合的牙龈消化的关键因素。确定最佳的浸出条件为3 mol / l NH 4 Cl，2.5mol / L. NH3中心点H2O，1mol / L，NH 4 HF 2,10ml / g液体与固体比，60℃和3小时。在条件下，铜的浸出效率为89.39％。浸出过程由反应物在产物层上扩散来控制，并且对应于0，0.1,0.3和0.5mol / L NH 4 HF 2的活化能量分别计算为27.9,19.8,30.7和32.6kJ / mol。 （c）2017 Elsevier B.v.保留所有权利。

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