利用二次铜渣机械化学法还原解毒无钙焙烧铬渣的研究

doi:10.19964/j.issn.1006-4990.2025-0079

Abstract

Abstract:

Calcium⁃free roasted chromite ore processing residue（COPR） is a typical hazardous industrial waste generated during chromium salt production and poses significant environmental risks.In this study，a mechanochemical approach was proposed based on the “waste⁃to⁃treat⁃waste” concept，using secondary copper slag（SCS） as a reducing agent to achieve the synergistic detoxification of COPR.The aim was to realize both the resource utilization of solid waste and environmentally friendly remediation.The optimal treatment parameters were determined as follows：ball milling speed of 550 r/min，ball⁃to⁃powder ratio of 12.5，milling time of 120 minutes，mass ratio of SCS to COPR of 1∶5，and the dosage of 98% sulfuric acid of 0.12 mL.Under these conditions，the total leaching concentration of Cr in COPR was decreased from 478.16 mg/L to 2.56 mg/L，and Cr（Ⅵ） was decreased from 455.35 mg/L to 0.25 mg/L，meeting the standards specified in the Technical Specification for Chromium Slag Pollution Control（HJ/T 301—2007）.The characterization results revealed that mechanical forces disrupted the crystalline structure and oolitic morphology of COPR，reduced particle size，and increased reactive surface sites，thereby facilitating the release of encapsulated Cr（Ⅵ）.Meanwhile，Fe（Ⅱ） in SCS was activated under acidic conditions and transferred electrons to Cr（Ⅵ），reducing it to Cr（Ⅲ），which subsequently precipitated as stable hydroxide compounds.This study innovatively demonstrated the feasibility of synergistic Cr（Ⅵ） reduction in COPR using SCS，providing technical support and new insights for the green detoxification and resource utilization of COPR.

Key words: chromite ore processing residue, mechanochemical method, reduction, detoxification

CLC Number:

X781

ZHAO Zhiying, ZHAO Xiaolong, CHEN Xiaohong, DU Ying, DU Dongyun. Study on reductive detoxification of calcium⁃free roasted chromite ore processing residue via mechanochemical activation with secondary copper slag[J]. Inorganic Chemicals Industry, 2026, 58(1): 74-83.

Figures/Tables 14

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原料	w（Fe）	w（Na）	w（Al）	w（Cr）	w（Ca）	w（Si）	w（S）
COPR	31.81	7.38	7.11	5.97	4.41	3.94	0.20
SCS	16.71	3.97	4.09	0.13	11.51	14.30	1.07

来源	方差平方和	D_f	均方差	F值	P值	显著性
模型	53 772.84	20	2 688.64	115.19	<0.000 1	显著
A	15 886.08	1	15 886.08	680.60	<0.000 1	显著
B	16 674.10	1	16 674.10	714.36	<0.000 1	显著
C	4 812.68	1	4 812.68	206.19	<0.000 1	显著
D	2 744.74	1	2 744.74	117.59	<0.000 1	显著
E	11.14	1	11.14	0.477 2	0.496 0	不显著
AB	909.54	1	909.54	38.97	<0.000 1	显著
AC	1 692.09	1	1 692.09	72.49	<0.000 1	显著
AD	539.91	1	539.91	23.13	<0.000 1	显著
AE	36.37	1	36.37	1.56	0.223 5	不显著
BC	1 389.09	1	1 389.09	59.51	<0.000 1	显著
BD	61.73	1	61.73	2.64	0.116 4	不显著
BE	57.52	1	57.52	2.46	0.129 0	不显著
CD	754.33	1	754.33	32.32	<0.000 1	显著
CE	31.77	1	31.77	1.36	0.254 4	不显著
DE	42.15	1	42.15	1.81	0.191 1	不显著
残差	583.53	25	23.34
失拟项	496.63	20	24.83	1.43	0.370 1	不显著
纯误差	86.91	5	17.38
总离差	54 356.37	45
						R²=0.961 2

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on reductive detoxification of calcium⁃free roasted chromite ore processing residue via mechanochemical activation with secondary copper slag

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