Detoxification of chromium ore processing residue from roasting chromite without calcium by SO<sub>2</sub> reduction

WU Jun; QUAN Xuejun; LI Gang; LU Cunfang; LUO Huazheng

doi:10.11949/j.issn.0438-1157.20170863

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Detoxification of chromium ore processing residue from roasting chromite without calcium by SO₂ reduction

更新时间：2025-12-10

- Detoxification of chromium ore processing residue from roasting chromite without calcium by SO₂ reduction
- CIESC Journal Issue 4, Pages: 1678-1686(2018)
- 作者机构：
  
  重庆理工大学化学化工学院,重庆,400054
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20170863
  CLC： Q136.1
- Online First：05 April 2018，
  
  Published：05 April 2018
- 稿件说明：
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WU Jun, QUAN Xuejun, LI Gang, et al. Detoxification of chromium ore processing residue from roasting chromite without calcium by SO₂ reduction[J]. CIESC Journal, 2018, (4): 1678-1686. DOI: 10.11949/j.issn.0438-1157.20170863.
DOI：

WU Jun, QUAN Xuejun, LI Gang, et al. Detoxification of chromium ore processing residue from roasting chromite without calcium by SO₂ reduction[J]. CIESC Journal, 2018, (4): 1678-1686. DOI: 10.11949/j.issn.0438-1157.20170863. DOI：

摘要

系统地对铬铁矿无钙焙烧渣进行了表征，并研究了SO2还原解毒铬渣，提出了机械活化与SO2还原相结合的解毒工艺。结果表明，该铬渣主要物相组成是（Fe，Mg）（Cr，Fe）2O4和MgAlFeO4，铬渣中Cr2O3含量为12.23%，铬渣粒径越小，含有的总Cr（Ⅵ）、水溶性Cr（Ⅵ）、难溶性Cr（Ⅵ）量越小。SO2还原解毒铬渣工艺过程中搅拌能有效强化外扩散过程，液固比增大有利于铬渣中Cr（Ⅵ）的浸出，铬渣中Cr（Ⅵ）的浸出随温度升高先增加后急剧降低，反应体系中压力变化对铬渣还原解毒效果影响不大。优化的SO2还原解毒铬渣条件为：压力0.1 MPa、温度60℃、搅拌速度500 r·min-1、反应时间60 min，此时铬渣中Cr（Ⅵ）的去除率达90%；机械活化90 min的铬渣进行SO2还原解毒60 min后，渣中的Cr（Ⅵ）去除率达到98.1%，含量降至25 mg·kg-1以下，达到国家排放标准。

Abstract

Chromium ore processing residue (COPR) from roasting chromite without calcium is characterized systematically.The detoxification of COPR by SO2 reduction is investigated. The detoxification process combining mechanical activation with SO2 reduction is proposed. The results show that the main phases of the COPR are (Fe

Mg) (Cr

Fe) 2O4 and MgAlFeO4. The content of Cr2O3 in the CPR is 12.23%. The smaller the particle size of COPR

the lower the content of the total Cr(Ⅵ)

water-soluble Cr(Ⅵ) and insoluble Cr(Ⅵ). In the detoxification process of COPR by SO2 reduction

stirring can promote the process of external diffusion effectively and increasing liquid solid ratio is beneficial to the leaching of Cr(Ⅵ) in the COPR. With the increase of temperature

the leaching of Cr(Ⅵ) in COPR increases first

then decreases sharply. The pressure of reaction system has little influence on the detoxification of the COPR. Under the optimized experimental conditions:the pressure 0.1 MPa

the temperature 60℃

the stirring speed 500 r·min-1

and the reaction time 60 min

the removal rate of Cr(Ⅵ) in COPR was 90%

while the removal rate of Cr(Ⅵ) in COPR was 98.1%

and Cr(Ⅵ) content falls below 25 mg·kg-1

meeting the national discharge standard after 90 min of mechanical activation to the COPR.

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Detoxification of chromium ore processing residue from roasting chromite without calcium by SO2 reduction

DOI：10.11949/j.issn.0438-1157.20170863

摘要

Abstract

关键词

Keywords

references

Detoxification of chromium ore processing residue from roasting chromite without calcium by SO₂ reduction