铬铁矿无钙焙烧铬渣的深度提铬与无害化处理

doi:10.11962/1006-4990.2020-0071

Abstract

Abstract:

The lime-free roasting process of chromite ore is the mainstream production process in global chromium chemical industry at present.However,the chromite ore processing residue（COPR） produced by the lime-free roasting process contains hexavalent chromium with high content.Direct storage or landfill of COPR leads to not only chromium resource waste but also environmental pollution.Based on the composition characteristics of the COPR,an technical route of acid leaching,oxidative roasting and hydrometallurgical detoxification was put forward.The proper technical parameters were determined and the technical feasibility was discussed.The results showed that,the chromium content of the COPR can be significant improved after impurity removal through two-steps acid leaching treatment.The efficient extraction of chromium from COPR was there-fore achieved by oxidative roasting the acid-leaching COPR.The chromium extraction rate achieved as high as 73%,and the mass fraction of Cr₂O₃ in the tailings reduced to 5.60%.After hydrometallurgical detoxification,the leaching toxicity can meet the requirements of pollution control index limit for landfill.The research results can provide a technical solution to the chromium extraction and detoxification of the COPR from the lime-free roasting process of chromite ore.

Key words: lime-free roasting, chromite ore processing residue（COPR）, acid leaching, oxidative roasting, chromium extrac-tion, hydrometallurgical detoxification

CLC Number:

TQ136.11

Qing Penghui,Dong Yuming,Wang Xingrun,Zhu Kaisheng,Niu Renjie,Meng Jingjuan,Chen Xiaohong,Chen Huixia,Zhang Hongling,Xu Hongbin. Chromium extraction and detoxification of processing residue from lime-free roasting process of chromite ore[J]. Inorganic Chemicals Industry, 2020, 52(6): 63-67.

Figures/Tables 9

References 16

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成分	质量分数/%	成分	质量分数/%
Cr₂O₃	12.95	MgO	14.82
Fe₂O₃	37.49	SiO₂	4.62
Al₂O₃	23.63	CaO	3.66

成分	质量分数/%	成分	质量分数/%
Cr₂O₃	18.08	MgO	20.08
Fe₂O₃	48.29	SiO₂	0.53
Al₂O₃	14.39	CaO	0.68

成分	质量分数/%	成分	质量分数/%
Cr₂O₃	5.60	SiO₂	0.60
Fe₂O₃	58.62	CaO	0.84
Al₂O₃	11.52	Cr⁶⁺	0.04
MgO	22.92

项目	浸出液中铬的质量浓度/（mg·L^-1）
项目	Cr⁶⁺	总Cr
检测值	0.04	0.1
国标限值	5	15
行标限值	3	9

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Chromium extraction and detoxification of processing residue from lime-free roasting process of chromite ore

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