The leaching characteristics of common toxic elements in phosphogypsum

IF 1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Geochemistry-Exploration Environment Analysis Pub Date : 2020-09-07 DOI:10.1144/geochem2019-062

Xin Peng, Y. Deng, Xiangdan Zhang, Lu Liu, Jian Hu, Xianqian Duan, Zhicheng Wei, Qi Feng, Ke Shen

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引用次数: 4

Abstract

Phosphogypsum (PG) is an acid by-product 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 electrical conductivity 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. Supplementary material: Chemical compositions of the phosphogypsum and pairwise Wilcoxon test results are available at https://doi.org/10.6084/m9.figshare.c.5088187

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磷石膏中常见有毒元素的浸出特性

磷石膏是磷肥生产过程中产生的酸性副产物，在世界范围内大量生产。然而，由于PG中各种杂质的数量和技术限制，导致PG积累，对邻近环境构成威胁，因此对这些废物的再利用具有挑战性。为了减少PG的储存和安全利用PG，我们的研究目的是确定PG中杂质在不同条件下的浸出特性。我们发现(1)不同的浸出实验呈现出不同的渗滤液分布(包括pH和渗滤液的电导率值)，这表明液固比、温度、振荡强度、粒度和pH对浸出杂质浓度有显著影响;(2)所有渗滤液(即可溶性P、氟、Zn、Pb、As和Hg)提取浓度对L/S比和pH的影响显著高于其他条件的影响;(3)浸出浓度受pH的影响较大，相关分析表明浸出液中可溶性P、F、As和Hg浓度之间存在较强的相关性。本研究揭示了PG中潜在有毒元素的系统浸出机制，为PG资源综合利用和周边环境治理提供了指导和参考。补充材料:磷石膏的化学成分和成对Wilcoxon测试结果可在https://doi.org/10.6084/m9.figshare.c.5088187上获得

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来源期刊

Geochemistry-Exploration Environment Analysis 地学-地球化学与地球物理

CiteScore

3.60

自引率

16.70%

发文量

审稿时长

1 months

期刊介绍： Geochemistry: Exploration, Environment, Analysis (GEEA) is a co-owned journal of the Geological Society of London and the Association of Applied Geochemists (AAG). GEEA focuses on mineral exploration using geochemistry; related fields also covered include geoanalysis, the development of methods and techniques used to analyse geochemical materials such as rocks, soils, sediments, waters and vegetation, and environmental issues associated with mining and source apportionment. GEEA is well-known for its thematic sets on hot topics and regularly publishes papers from the biennial International Applied Geochemistry Symposium (IAGS). Papers that seek to integrate geological, geochemical and geophysical methods of exploration are particularly welcome, as are those that concern geochemical mapping and those that comprise case histories. Given the many links between exploration and environmental geochemistry, the journal encourages the exchange of concepts and data; in particular, to differentiate various sources of elements. GEEA publishes research articles; discussion papers; book reviews; editorial content and thematic sets.