太阳能级多晶硅切割废料的酸洗除杂研究

摘要为获得一种制备高纯硅的高纯原料，在分析太阳能级多晶硅切割废料（CLW）物性的基础上，详细研究了CLW的酸浸除杂，超声酸浸除杂，考察了盐酸浓度、酸浸时间、酸浸温度、酸浸液固比和搅拌对除杂效果的影响，并分析了超声酸洗过程动力学，得到的最适宜工艺条件为：w（盐酸）为19%，反应时间3 h，水浴温度为60℃，浸出液固比4：1，搅拌速度150 r/min。在此最适宜工艺条件下，切割废料中金属元素杂质的去除率可高达96.50%、非金属元素杂质的去除率达46.44%。超声酸洗除杂效果要好于机械搅拌酸洗的除杂效果，但随着酸洗时间的延长，除杂效果变化不明显，最终金属元素杂质和非金属元素杂质的去除率分别达到了98.43%和52.40%，超声酸洗CLW的反应过程符合缩核模型，反应过程为产物层扩散控制。

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	李峰
	刘洋
	郭菁
	邢鹏飞

关键词：太阳能级多晶硅切割废料酸洗超声场动力学

Abstract： In order to obtain a kind of high-purity raw material for the preparation of high-purity silicon, the methods to purify the cutting loss waste(CLW), such as acid leaching, ultrasonic field purification were studied on the basis of analyzing the physical properties of CLW. The effect of mass fraction of hydrochloric, acid leaching time, temperature, ratio of leaching liquid to solid and stirring speed on impurity remove was investigated, and the kinetics of ultrasonic pickling process was analyzed. The optimal conditions of acid leaching were obtained as follows: hydrochloric acid 19%(mass fraction), reaction time 3 h, temperature 60 ℃, the ratio of leaching liquid to solid 4∶1 and stirring speed 150 r/min. With this optimum condition, up to 96.50% metallic in CLW can be removed, 46.44% non-metallic can be removed. The removal effect of ultrasonic leaching was better than that of mechanical stirring leaching. However, with the extension of leaching time, the removal effect did not change significantly. As a result, the elimination of metallic and non-metallic impurities reached 98.43% and 52.40% respectively. The reaction process of ultrasonic pickling CLW conforms to the nuclear shrinkage model, and the reaction process is product layer diffusion control.

Keywords： SOG-polycrystalline silicon； cutting loss waste(CLW)； acid pickling； ultrasonic field； kinetics

Received 2020-07-13;

Fund:陕西省教育厅重点实验室科研计划项目（18JS033）；商洛市科技计划项目（SK2016-35）；商洛学院科学与技术研究项目（16SKY032）；商洛学院根植地方行动计划项目（gz16005和gz17032）。

Corresponding Authors: 李峰,E-mail:lifeng7002@163.com。 Email: lifeng7002@163.com

About author: 李峰(1980-),男,博士,讲师,现从事固体废弃物资源化利用方面的研究。

引用本文:

李峰, 刘洋, 郭菁, 邢鹏飞.太阳能级多晶硅切割废料的酸洗除杂研究[J]. 化学工业与工程, 2021,38(1): 79-85

Li Feng, Liu Yang, Guo Jing, Xing Pengfei.Research on Remove of Impurity of SOG-polycrystalline Silicon Cutting Loss Waste by Acid Pickling[J]. Chemcial Industry and Engineering, 2021,38(1): 79-85

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