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The leaching characteristics of common toxic elements in phosphogypsum

Peng Xin, Deng Yinger, Zhang Xiangda, Liu Lu, Hu Jian, Duan Xianqian, Wei Zhicheng, Feng Qiuping and Shen Ke
The leaching characteristics of common toxic elements in phosphogypsum
Geochemistry - Exploration, Environment, Analysis (July 2020) 20 (4): 473-479

Abstract

Phosphogypsum (PG) is an acid byproduct from the production phosphate fertilizers that is produced in large amounts all over the world. However, it is challenging to reuse this waste due to the quantities of various impurities in PG and technical restrictions, resulting in PG accumulation, which threatens adjacent environments. To reduce PG storage and safely utilize PG, the aim of our study was to define the leaching characteristics of the impurities present in PG under different conditions. We found that (1) different leaching experiments showed different leachate profiles (including pH and Ec values of leachate), which indicated that the liquid/solid (L/S) ratio, temperature, oscillation strength, particle size, and pH have remarkable effects on the concentration of leached impurities; (2) all leachate (i.e., soluble P, fluoride, Zn, Pb, As, and Hg) extraction concentrations were significantly more sensitive to the effect of the L/S ratio and pH than the effect of the other conditions; and (3) the leaching concentration was strongly influenced by pH, and a strong correlation among soluble P, F, As, and Hg concentrations in the leachate was demonstrated by a correlation analysis. In the present study, we revealed a systematic leaching mechanism of potential toxic elements in PG and have provided guidance and a reference for PG resource comprehensive utilization and surrounding environment treatment.


ISSN: 1467-7873
EISSN: 2041-4943
Serial Title: Geochemistry - Exploration, Environment, Analysis
Serial Volume: 20
Serial Issue: 4
Title: The leaching characteristics of common toxic elements in phosphogypsum
Affiliation: Chengdu University of Technology, College of Environment and Civil Engineering, Chengdu, China
Pages: 473-479
Published: 20200730
Text Language: English
Publisher: Geological Society Publishing House, London, United Kingdom
References: 40
Accession Number: 2020-063326
Categories: Environmental geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Secondary Affiliation: Shifang Environmental Monitoring Station, CHN, China
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 202039
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