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首页> 外文期刊>Journal of industrial and engineering chemistry >Leaching kinetics of colemanite in potassium hydrogen sulphate solutions
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Leaching kinetics of colemanite in potassium hydrogen sulphate solutions

机译：硫酸氢钾溶液中硬锰矿的浸出动力学

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The aim of the study was to investigate the dissolution kinetics of colemanite in potassium hydrogen sulphate solutions in a mechanical agitation system and to declare an alternative reactant to produce boric acid. Reaction temperature, concentration of potassium hydrogen sulphate, stirring speed, solid/ liquid ratio and colemanite particle size were selected as parameters on the dissolution rate of colemanite. The experimental results were successfully correlated by linear regression using Statistica Package Program. Dissolution curves were evaluated in order to test shrinking core models for solid-fluid systems. It was observed that increase in the reaction temperature and decrease in the solid/liquid ratio causes an increase the dissolution rate of colemanite. The dissolution extent is highly increased with increase the stirring speed rate between 100 and 500 rpm and the dissolution extent is slowly increased with increase the stirring speed between 500 and 700 rpm in experimental conditions. The activation energy was found to be 26.34 kJ/mol. The leaching of colemanite was controlled by diffusion through the product (or ash) layer. The rate expression associated with the dissolution rate of colemanite depending on the parameters chosen may be summarized as follows: 1 -3(1 -X)~(2/3) +2(1 -X) = 10.41 × C~(1.01) × W~(1.55) × D~(-1.43) × (S/L)~(-0.06) × e~(-26.34/RT)) × t.
机译：该研究的目的是研究在机械搅拌系统中硬锰矿在硫酸氢钾溶液中的溶解动力学，并宣布产生硼酸的另一种反应物。选择反应温度，硫酸氢钾浓度，搅拌速度，固/液比和硬锰矿粒度作为关于硬锰矿溶解速率的参数。使用Statistica Package Program通过线性回归成功地关联了实验结果。评估了溶出曲线，以测试固体流体系统的收缩核模型。观察到反应温度的升高和固/液比的降低导致硬锰矿的溶解速率增加。在实验条件下，随着搅拌速度在100和500 rpm之间的增加，溶解程度会大大增加;随着搅拌速度在500和700 rpm之间的增加，溶解程度会慢慢增加。发现活化能为26.34kJ / mol。通过在产物（或灰分）层中的扩散来控制钙锰矿的浸出。取决于所选择的参数，与硬锰矿的溶解速率相关的速率表达式可总结如下：1 -3（1-X）〜（2/3）+2（1-X）= 10.41×C〜（1.01） ×W〜（1.55）×D〜（-1.43）×（S / L）〜（-0.06）×e〜（-26.34 / RT））×t

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