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首页> 外文期刊>Separation and Purification Technology >Pretreatment of recycling wiresaw slurries-Iron removal using acid treatment and electrokinetic separation
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Pretreatment of recycling wiresaw slurries-Iron removal using acid treatment and electrokinetic separation

机译：回收线锯浆料的预处理-酸处理和电动分离除铁

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Iron removal is an important step when recycling silicon wiresaw slurries. The iron to be removed primarily comes from the saw wire generated when cutting silicon ingots. This study assessed the effectiveness of using acid treatment and electrokinetic separation to remove iron from silicon slurries. Experiments focused on the effects of the HNO3 volume and concentration in the acid treatment and the effects of applied electric field and duration during electrokinetic separation on iron removal efficiency. Experimental results reveal that the operational parameters for optimal removal efficiency were 150 ml of 1M HNO3 aqueous solution to remove iron in 40 min via acid treatment, and 1 V/cm and 90 h to achieve a 90.2% removal efficiency using the electrokinetic separation. Via dissolution, cleaning and drying processes in the acid treatment, residual iron ions formed iron precipitates which trapped between Si or SiC particles. However, the metal ions can migrate toward the cathode via the electrical field during electrokinetic separation. Therefore, electrokinetic separation is better at removing iron from wiresaw slurries than the acid treatment.
机译：除铁是回收硅线锯浆料的重要步骤。要去除的铁主要来自切割硅锭时产生的锯线。这项研究评估了使用酸处理和电动分离从硅浆料中去除铁的有效性。实验集中在酸处理中HNO3的体积和浓度的影响以及电动分离过程中施加的电场和持续时间对铁去除效率的影响。实验结果表明，最佳去除效率的操作参数为：150 ml 1M HNO3水溶液通过酸处理在40分钟内去除铁，以及1 V / cm和90 h使用电动分离实现90.2％去除效率。通过酸处理中的溶解，清洁和干燥过程，残留的铁离子形成铁沉淀物，这些沉淀物夹在Si或SiC颗粒之间。但是，在电动分离过程中，金属离子可以通过电场向阴极迁移。因此，相比于酸处理，电动分离在从线锯浆料中去除铁方面更好。

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