工业石膏的资源化利用途径与展望

doi:10.19964/j.issn.1006-4990.2020-0558

Abstract

Abstract:

A large amount of by-product gypsum is produced in the process of industrial production,such as electric power,iron and steel,phosphate fertilizer,etc.If it cannot be properly treated and put it aside in large quantities,it will not only cause environmental pollution but also lead to waste resources.The harmless,comprehensive and high-quality utilization of by-pro-duct gypsum has become a topical focus in industrial development.The application and technical development status of desul-furization gypsum and phosphogypsum in cement,building materials,agriculture and chemical industry were summarized,and the suggestions for the resource utilization of industrial gypsum in the future were put forward.In this paper,it was pointed out that industrial routes such as preparing sulphuric acid co-production cement,calcium ferrite and conversion of ammonium to sulphuric acid by industrial gypsum were feasible,which would expect to realize the large-scale utilization of desulphuriza-tion gypsum and phosphogypsum.

Key words: desulfurization gypsum, phosphogypsum, natural gypsum, comprehensive utilization

CLC Number:

TQ132.32

Liu Lincheng,Zuo Haibin,Xu Zhiqiang. Resource utilization approach of industrial gypsum and its prospect[J]. Inorganic Chemicals Industry, 2021, 53(10): 1-9.

Figures/Tables 8

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References 60

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原料	w（CaO）	w（SiO₂）	w（Al₂O₃）	w（SO₃）	w（Fe₂O₃）
天然石膏	31.12	2.38	0.82	35.16	0.35
脱硫石膏	31.42	3.12	1.38	44.72	0.34
原料	w（MgO）	w（K₂O）	w（Na₂O）	烧失率
天然石膏	4.39	≤0.3	≤0.15	23.85
脱硫石膏	0.35	≤0.4	≤0.10	18.04

w（SO₃）	w（CaO）	w（SiO₂）	w（Al₂O₃）	w（MnO）	w（Fe₂O₃）	w（MgO）
32.20	28.63	17.06	0.236	≤0.1	0.212	≤0.03
w（K₂O）	w（Na₂O）	w（P₂O₅）	w（F）	w（水）	w（其他）	pH
≤0.1	≤0.1	0.70	≤0.5	18.84	1.441	3.11

类型	方法	反应物	反应温度/℃	产物	优点（O）和缺点（X）
相转变法	水热法	石膏	120 （高压）	半水合物（HH）	纯度高（O）条件苛刻（X）
	盐溶液法	石膏、 HCl、CaCl₂	98~101	HH	常压条件（O）污染环境（X）
	盐溶液法	石膏、 H₂SO₄、CaCl₂	102~120	HH	常压条件（O）污染环境（X）
	有机溶剂法	石膏、甘油	110	HH	常压条件（O）高成本（X）
结晶法	结晶法	石膏、无机酸	70~110	二水合物（DH）	杂质去除（O）低性能（X）

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Resource utilization approach of industrial gypsum and its prospect

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