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首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >A study of factors influencing the kinetics of copper cementation during atmospheric leaching of converter matte
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A study of factors influencing the kinetics of copper cementation during atmospheric leaching of converter matte

机译：转炉粗砂大气浸出过程中影响铜胶结动力学的因素研究

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摘要

The kinetics of copper cementation during atmosphere leaching of a Ni-Cn matte in CuSO_4-H_2SO_4 solution was studied as a function of initial copper ion concentration, initial acid concentration, temperature, stirring rate, particle size distribution and pulp density. It was found that all these process variables influenced the rate of cementation. A two-stage rate of reaction was observed in most of the experiments, with the rate of cementation in the initial stage being slower than that of the subsequent second stage. The increased rate of cementation in the second stage was attributed to the enhancing effect of the surface deposit. The cementation process was found to take place by two different rate-controlling mechanisms. At a temperature range of 50-70 deg C, an activation energy of 74.6 kJ/mol was obtained, indicating a surface reaction controlled process. At higher temper-attires {70-80 deg C) a lower value of activation energy was observed (18.2 kJ/mol), indicative of a process controlled by diffusion through surface layers. The structural characteristics of the cemented deposit could not be determined in the investigated system where the deposit was mixed with the leach solid residue.
机译：研究了CuSO_4-H_2SO_4溶液中Ni-Cn磨砂的大气浸出过程中铜胶结动力学与初始铜离子浓度，初始酸浓度，温度，搅拌速率，粒度分布和纸浆密度的关系。发现所有这些过程变量都影响胶结速率。在大多数实验中，观察到两阶段的反应速率，初始阶段的胶结速率比随后的第二阶段的速率慢。第二阶段胶结速率的增加归因于表面沉积物的增强作用。发现胶结过程是通过两种不同的速率控制机制进行的。在50-70℃的温度范围内，获得了74.6kJ / mol的活化能，表明表面反应受控的过程。在较高的温度（70-80摄氏度）下，观察到较低的活化能值（18.2 kJ / mol），表明该过程受扩散穿过表面层的控制。在将沉积物与浸出固体残渣混合的研究系统中，无法确定胶结沉积物的结构特征。

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