Effect of Lime on Stability of Chromium in Stainless Steel Slag

被引：17
|
作者：
Zhao, Qing [1 ,2 ]
Liu, Chengjun [1 ,2 ]
Cao, Longhu [3 ]
Zheng, Xiang [1 ,2 ]
Jiang, Maofa [1 ,2 ]
机构：
[1] Northeastern Univ, Minist Educ, Key Lab Ecol Met Multimetall Minerals, Shenyang 110819, Liaoning, Peoples R China
[2] Northeastern Univ, Sch Met, Shenyang 110819, Liaoning, Peoples R China
[3] WISDRI Engn & Res Inc Ltd, Wuhan 430223, Hubei, Peoples R China
来源：
MINERALS | 2018年 / 8卷 / 10期
基金：
国家重点研发计划; 中国国家自然科学基金;
关键词：
stainless steel slag; lime; basicity; phase transformation; chromium pollution; CRYSTALLIZATION BEHAVIOR; PHASE-EQUILIBRIA; BASICITY; DISSOLUTION; PHOSPHORUS; OXIDATION; MECHANISM; OXIDE; CAO; MGO;
D O I：
10.3390/min8100424
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
The stabilization of chromium is of great importance to the use of stainless steel slag (SSS), and the influence of lime on the stability of chromium is currently unclear. In this work, the variation of phase transformation and chromium distribution with slag basicity (CaO/SiO2) were investigated experimentally, and the leaching ability of chromium was evaluated. Results showed that chromium-bearing phases were glass, dicalcium silicate (C2S), spinel, and periclase, while the degree of enrichment of chromium in these phases was found to be closely related to the basicity. The optimal basicity obtained in this research was 1.5, with the chromium mainly present in the stable spinel and exhibiting the lowest leaching ability. The product layer structure of unmelted lime was studied as well, showing a periclase layer and a Ca2SiO4 layer. Some CaCr2O4 had formed in the periclase layer, which is potentially hazardous for the environment and living organisms.
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页数：10
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