期刊
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
卷 9, 期 6, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2021.106711
关键词
Spent sulfuric acid; Lime mud; Water treatment; Waste recycling; Gypsum; Anhydrite
资金
- Ministry of Science and Higher Education of the Russian Federation [K2-2020-024]
A green approach for the synthesis of gypsum and anhydrite from industrial wastes was proposed in this study. High-quality products can be obtained at room temperature, and the approach was found to be advantageous from technological, environmental, and economic perspectives. The filtrate generated during synthesis can be used as complex fertilizer.
Millions of tons of hazardous spent sulfuric acid and lime mud from water treatment facilities are produced per year. A green approach for the synthetic gypsum and anhydrite derived from such industrial wastes was proposed. It was found that direct structural controlled synthesis of anhydrite can be performed at usual conditions for synthesis of gypsum: 55 degrees C and atmospheric pressure. High-quality gypsum can be obtained at room temperature. The results obtained were confirmed by XRD, SEM, TEM, DTA, thermochemical and thermodynamics calculations. It was shown by a number of indicators that such approach is advantageous from technological, environmental and economic point of view. The filtrate formed during the synthesis contains sulfur, calcium, magnesium, sodium and potassium and can be used as a complex fertilizer. The results of bioindication when growing oil radish showed a double increase in the length of the main root when using a neutralized filtrate.
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