铬渣-稻壳压片热解解毒新工艺研究

doi:10.19964/j.issn.1006-4990.2024-0345

Abstract

Abstract:

Chromium slag is the waste residue produced in the process of chromite production，which contains water-soluble and insoluble hexavalent chromium and has potential harm to the ecological environment and human health.Therefore，it is of great significance to study the efficient and low-cost detoxification process of chromium slag for realizing its resource utilization and green development.In this paper，an efficient detoxification process was proposed for the pyrolysis of chromium slag and rice husk.Chromium slag and agricultural waste rice husk were mixed for pyrolysis，and Cr（Ⅵ） in chromium slag was reduced to non-toxic trivalent chromium［Cr（Ⅲ）］ by using reducing gas and biochar generated by the pyrolysis of rice husk.The effects of rice husk/chromium slag mass ratio，pyrolysis temperature，pyrolysis time and pyrolysis heating rate on the detoxification effect of chromium slag were investigated.The results showed that under the conditions of rice husk consumption of 1.00 g/g，pyrolysis temperature of 500 ℃，pyrolysis time of 20 min and heating rate of 10 ℃/min，Cr（Ⅵ） content in chromium slag was decreased from 1 058.85 mg/kg to 52.54 mg/kg.Compared with the pyrolysis process of powder mixture，the pyrolysis process of chromium slag-rice husk compendization reduced the Cr（Ⅵ） content in chromium slag to 52.54 mg/kg.The detoxification rate was increased to 96.74%，and the chromium slag after detoxification reached the Cr（Ⅵ） hazardous waste identification standard stipulated in the national standard GB 5085.3—2007“Identification standards for hazardous wastes—Identification for extraction toxicity”.X-ray diffraction（XRD） analysis was conducted on the chromium slag after detoxification，and the results showed that the material was the same before and after detoxification.The research results could provide a new technical idea for the harmless treatment of calcined chromium slag without calcium.

Key words: chromium slag, pyrolysis, rice hull, detoxify

CLC Number:

TQ136.1

JIANG Mengzhi, JIANG Zhanghao, QUAN Xuejun, LI Gang, WEI Ying, YAN Chunyu. Study on new pyrolysis detoxification technology of chromium slag-rice husk briquette[J]. Inorganic Chemicals Industry, 2025, 57(6): 93-99.

Figures/Tables 10

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样品名称	Cr（Ⅵ）浸出质量浓度/（mg·L^-1）	Cr（Ⅵ）平均值/（mg·L^-1）	总铬浸出质量浓度/（mg·L^-1）	总铬平均值/ （mg·L^-1）
原始铬渣	40.40	40.40	40.41	40.41
	40.41		40.41
	40.38		40.40
解毒后的铬渣	2.52	2.52	2.53	2.53
	2.52		2.53
	2.53		2.53

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Study on new pyrolysis detoxification technology of chromium slag-rice husk briquette

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