Leaching of silica from vanadium-bearing steel slag in sodium hydroxide solution

被引：74

作者：

Xiao, Qinggui ^{[1
]}

Chen, Yin ^{[2
]}

Gao, Yiying ^{[1
]}

Xu, Hongbin ^{[1
]}

Zhang, Yi ^{[1
]}

机构：

[1] Chinese Acad Sci, Natl Engn Lab Hydromet Cleaner Prod Technol, Inst Proc Engn, Beijing 100190, Peoples R China

[2] Beijing Univ Chem Technol, Res Ctr, Minist Educ High Grav Engn & Technol, Beijing 100029, Peoples R China

来源：

HYDROMETALLURGY | 2010年 / 104卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Reaction kinetics; Vanadium-bearing steel slag; Silica leach; Sodium hydroxide; CHROMITE;

D O I：

10.1016/j.hydromet.2010.06.007

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The work aims to selectively extract silica from vanadium-bearing steel slag by a leaching process. The effects of the particle size, the ratio of solid to liquid, the concentration of sodium hydroxide solution and the leaching temperature on the leaching behavior of silica from vanadium-bearing steel slag were investigated. The leaching kinetics of silica from vanadium-bearing steel slag in 30-50% w/w NaOH solutions was studied at 240 degrees C and the shrinking-core model was established to express the leaching kinetics of silica. The data showed that the leaching rate was controlled by the chemical reaction on the system interface and the activation energy for the process was found to be 36.4 kJ mol(-1). By the leaching process, the majority of silica could be removed effectively from the vanadium-bearing steel slag and a residue with a low SiO(2) content of 4.28% and a high V(2)O(5) content of 11.15% was obtained. Under these conditions there was partial dissolution of Al and slight dissolution of Cr, Mn and Ti. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：216 / 221

页数：6

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