为什么非晶态 FeO-SiO 渣在高温下不能进行酸浸。

Why amorphous FeO-SiO slags do not acid-leach at high temperatures.

机构信息

Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, ON, M5S 3E5, Canada.

出版信息

J Hazard Mater. 2017 Jan 5;321:737-744. doi: 10.1016/j.jhazmat.2016.09.055. Epub 2016 Sep 24.

DOI:10.1016/j.jhazmat.2016.09.055

PMID:27744239

Abstract

It has been shown previously that amorphous FeO-SiO slags are not amenable to high pressure oxidative acid leaching - unlike their crystalline counterparts. Independent studies of glass and silicate mineral dissolution at ambient conditions suggest that acid attack can be hindered by the formation of a passive silica layer. The current work extends this finding to the case of high temperature dissolution of amorphous FeO-SiO slags by providing evidence for the formation of a passive silica layer within slag particles under high pressure oxidative acid leaching conditions (250°C, 70g/L initial HSO, 0.62MPa [90psi] O). Based on the percolation model of glass dissolution, a mechanism of amorphous slag leaching is proposed.

摘要

先前已经表明，非晶态 FeO-SiO 渣在高压氧化酸浸中不易处理 - 与它们的晶态对应物不同。在环境条件下对玻璃和硅酸盐矿物溶解的独立研究表明，酸的侵蚀可以通过形成钝化的硅层来阻碍。目前的工作通过提供在高压氧化酸浸条件下（250°C，70g/L 初始 HSO，0.62MPa [90psi] O）在渣颗粒内形成钝化硅层的证据，将这一发现扩展到非晶态 FeO-SiO 渣的高温溶解情况。基于玻璃溶解的渗流模型，提出了一种非晶态渣浸出的机理。