含钙镁废渣综合利用的现状及展望

doi:10.19964/j.issn.1006-4990.2021-0227

Abstract

Abstract:

Calcium magnesium type waste residue can be divided into Ca（OH）₂ type and CaCO₃ type.According to the con-tent of magnesium,it can be divided into high magnesium type and low magnesium type.Only high magnesium type waste residue needs to separate and recover magnesium.The common calcium magnesium slags are calcium carbide slag,alkali slag,saponification slag,phosphorus tailings and so on.The present situation of comprehensive utilization of Ca（OH）₂ type waste residue was summarized as follows：Ca（OH）₂ type waste residue should be separated by leaching,filtration and carboni-zation.Calcium could be separated as PCC by calcination,digestion,leaching,filtration and carbonization.If it was a high mag-nesium type waste residue,it was necessary to increase the chemical and physical steps such as CO₂ carbonization,filtration separation,ammonia precipitation separation or pyrolysis of magnesium bicarbonate to realize the separation and recovery of magnesium.Looking forward to the future,the comprehensive utilization of calcium magnesium slag would be a kind of circular economy project with environmental,social and economic benefits,which is worthy of concern,attention and promotion.

Key words: calcium magnesium waste residue, Ca（OH）₂ type, CaCO₃ type, carbide slag, alkaline, saponified waste residue, phosphorus tailings

CLC Number:

TQ132.32

YAN Xin,WEI Yilan. Present situation and prospect of comprehensive utilization of waste residue containing calcium and magnesium[J]. Inorganic Chemicals Industry, 2022, 54(1): 7-11.

Figures/Tables 6

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References 20

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Inorganic Acid-Base-Salt Committee of CIESC

Present situation and prospect of comprehensive utilization of waste residue containing calcium and magnesium

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