使用高铁矿石尾矿用于4N8高纯度石英粉通过两阶段酸液生产

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Hailin Long¹, Xianqing Xu¹, Siwei Li¹

¹School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, Hunan, P. R. China.

Inorganic chemistry

|February 19, 2025

概括

这项研究详细介绍了一种两阶段的酸过程,以将铁矿石尾矿转化为4N8高纯度石英粉. 这种方法为生产用于半导体和光伏的高价值石英提供了可持续的途径.

科学领域:

材料科学材料科学材料科学
化学工程是化学工程的重要组成部分.
矿物加工矿物加工

背景情况:

铁矿石尾矿是有价值化潜力的重要废物流.
高纯度石英对于半导体和光伏等先进技术应用至关重要.
对于工业应用而言,有效的去除丰富材料中的杂质的方法至关重要.

研究的目的:

从高铁矿石尾矿中开发和优化生产4N8高纯度石英粉的工艺.
为了研究在酸洗过程中去除杂质的机制和动力学.
为铁矿石尾矿的高价值利用提供理论指导.

主要方法:

两个阶段的酸洗过程,使用来自铁矿石尾矿的缩物.
响应表面的方法来优化第一阶段的浸出参数 (酸度,温度,时间,液体-固体比率).
热力学和动力学分析以了解杂质溶解机制 (Fe和Al).
精细研磨和高温处理以精制最终产品.

主要成果:

优化的第一阶段液 (11.69mol/L酸,99.5°C,6.3小时) 实现了99.949%的SiO2纯度.
铁的浸动力学由化学反应控制 (Ea: 66.69 kJ/mol);Al的浸受到内部扩散 (Ea: 13.64 kJ/mol) 的限制.
第二阶段的浸出 (10mol/L酸,250°C,9小时) 进一步减少了杂质,产生了4N8高纯度石英粉末.

结论:

开发的两阶段酸流程有效地从铁矿石尾矿中产生4N8高纯度石英.
了解漏机制为流程优化和扩展提供了基础.
这项研究表明,采矿废物可持续,高价值利用的可行途径.

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