Study on the transformation mechanism of chromium in chromium sludge under reducing atmosphere

Wan Xinyu; Gao Jianjun; Cao Zhicheng; Wu Peipei; Xu Haichuan

doi:10.7513/j.issn.1004-7638.2022.05.015

Volume 43 Issue 5

Nov. 2022

Turn off MathJax

Article Contents

Article Navigation > IRON STEEL VANADIUM TITANIUM > 2022 > 43(5): 106-110, 122

Wan Xinyu, Gao Jianjun, Cao Zhicheng, Wu Peipei, Xu Haichuan. Study on the transformation mechanism of chromium in chromium sludge under reducing atmosphere[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(5): 106-110, 122. doi: 10.7513/j.issn.1004-7638.2022.05.015

Citation:

Wan Xinyu, Gao Jianjun, Cao Zhicheng, Wu Peipei, Xu Haichuan. Study on the transformation mechanism of chromium in chromium sludge under reducing atmosphere[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(5): 106-110, 122. doi: 10.7513/j.issn.1004-7638.2022.05.015

Citation:

PDF( 1217 KB)

Study on the transformation mechanism of chromium in chromium sludge under reducing atmosphere

doi: 10.7513/j.issn.1004-7638.2022.05.015

1.
State Key Laboratory of Advance Steel Processes and Products, Beijing 100081, China
2.
CISRI Sunward Technology Co., Ltd., Beijing 100081, China
3.
RHF Business Division, Baowu Group Environmental Resources Technology Co., Ltd., Shanghai 201900, China

Received Date: 2022-05-06
Publish Date: 2022-11-01

Abstract

Abstract

In this paper, the transformation mechanism of chromium in chromium sludge was studied under reducing atmosphere, and the feasibility of rotary hearth furnace (RHF) for treating chromium sludge was discussed. The results show that chromium mainly exists in the form of chromium hydroxide, calcium chromate and sodium chromate in the sludge. Under the CO-CO₂ atmosphere, the Cr(III) in the chromium sludge will not be oxidized to Cr(VI) and the original hexavalent chromium in the sludge will be reduced to trivalent chromium. Under the same CO concentration, the conversion rate of hexavalent chromium gradually decreases with the proportion of chromium mud increase. Under the CO-CO₂-O₂-N₂ atmosphere, after adding 3% and 6% oxygen, the conversion rate of hexavalent chromium and the change rate of hexavalent chromium are both negative, and Cr(III) will still not be oxidized to Cr(VI). Therefore, it is feasible to carry out harmless disposal of chromium sludge in the rotary hearth furnace process.
- chromium sludge,
- transformation mechanism,
- rotary hearth furnace,
- reducing atmosphere

FullText(HTML)

References(8)

References

[1]	Na Xianzhao, Qi Yuanhong. Resourceful disposal of chromium-containing residues in ferrous metallurgical process[J]. Journal of Iron and Steel Research, 2009,21(4):1−4. (那贤昭, 齐渊洪. 铬渣在钢铁冶金过程中的资源化利用[J]. 钢铁研究学报, 2009,21(4):1−4. doi: 10.13228/j.boyuan.issn1001-0963.2009.04.010
[2]	Shi Lei, Chen Ronghuan, Wang Ruyi. Application prospect of chromium sludge pellet in iron and steel industry[J]. Recyclable Resources and Circular Economy, 2007,(1):33−36. (石磊, 陈荣欢, 王如意. 含铬污泥球团在钢铁工业中的应用前景[J]. 再生资源研究, 2007,(1):33−36.
[3]	Zhang Lei, Liu Shangchao, Zhang Daoquan, et al. Application research on co-disposal of chromium sludge in the sintering and irongmaking[J]. Sintering and Pelletizing, 2018,43(5):61−64. (张垒, 刘尚超, 张道权, 等. 烧结炼铁协同处置含铬污泥的应用研究[J]. 烧结球团, 2018,43(5):61−64. doi: 10.13403/j.sjqt.2018.05.073
[4]	Shi Lei, Chen Ronghuan, Wang Ruyi. Study on metallurgical properties and pellet proportioning technology of stainless steel cold-rolling sludge[J]. Baosteel Technology, 2013,(2):23−27. (石磊, 陈荣欢, 王如意. 不锈钢冷轧污泥配矿压球工艺及冶金性能研究[J]. 宝钢技术, 2013,(2):23−27. doi: 10.3969/j.issn.1008-0716.2013.02.005
[5]	范志功. 冷轧含铬废水的处理及含铬污泥回收利用的研究[D]. 武汉: 武汉科技大学, 2009. Fan Zhigong. Study on treatment of cold rolling wastewater containing chromium and recovery in sludge[D]. Wuhan: Wuhan University of Science and Technology, 2009.
[6]	Fang Duokui, Li Xianwei, Su Junjie. Analysis on research progress of cold-rolled chromium-containing sludge[J]. Resources Economization & Environmental Protection, 2013,(6):54. (房多奎, 李咸伟, 苏俊杰. 冷轧含铬污泥资源化途径研究进展分析[J]. 资源节约与环保, 2013,(6):54. doi: 10.3969/j.issn.1673-2251.2013.06.037
[7]	Chen J, Jiao F, Zhang L, et al. Elucidating the mechanism of Cr (VI) formation upon the interaction with metal oxides during coal oxy-fuel combustion[J]. Journal of Hazardous Materials, 2013,261:260−268. doi: 10.1016/j.jhazmat.2013.07.023
[8]	Chen J C, Wey M Y, Chiang B C, et al. The simulation of hexavalent chromium formation under various incineration conditions[J]. Chemosphere, 1998,36(7):1553−1564. doi: 10.1016/S0045-6535(97)10053-4