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摘要:
磷石膏已成为制约磷化工行业可持续发展的重要因素。磷石膏除杂增白是实现其规模化应用于建材和填料的必经途径。本文采用漂白—煅烧法对某地浮选后的磷石膏进行处理,在漂白浸出温度90℃、液固比4:1、Ca(ClO)2用量为3.0%和浸出时间3.0 h条件下,漂白磷石膏的白度由51.5%增加到了74.5%,将漂白后的磷石膏在600℃下恒温煅烧120 min,得到煅烧磷石膏的白度为86.1%,增白效果显著,满足粉刷石膏和PVC/PE填料等要求。煅烧磷石膏主要成分是CaSO4,并呈表面光滑、大小不一的不规则片状结构。本研究对磷石膏规模化综合利用具有重要的指导意义。
Abstract:Phosphogypsum have has become the important factor that restricts the sustainable development of phosphorous chemical industry. Removal impurity and whitening of phosphogypsum is the only way to realize its large-scale utilization in building materials and fillers. In this paper, the phosphogypsum after flotation was treated by bleaching and calcination. Under the conditions of leaching temperature of 90 ℃, liquid-solid ratio of 4:1, Ca(ClO)2 dosage of 3.0% and leaching time of 3.0 h, the whiteness of bleached phosphogypsum increased from 51.5% to 74.5%. Furthermore, the whiteness of the whitened phosphogypsum significantly reached 86.1% after calcining at 600 ℃ for 120 min, which met the requirements of gypsum plaster and PVC filler. The main component of phosphogypsum after calcination was CaSO4, which was an irregular sheet structure with smooth surface and different sizes. This study has an important guiding significance for the large-scale comprehensive utilization of phosphogypsum.
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Key words:
- phosphogypsum /
- Ca(ClO)2 /
- bleaching /
- calcination /
- whitening
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表 1 磷石膏的X射线荧光分析结果
Table 1. XRF results of phosphogypsum
Composition CaO SO3 SiO2 Fe2O3 SrO Na2O MgO Al2O3 P2O5 其他 烧失量 Content/% 33.36 41.99 0.63 0.05 0.08 0.06 0.02 0.16 0.63 0.96 22.06 表 2 白度重复性验证试验结果
Table 2. Results of the repeatability verification experiments
/% Number 1 2 3 Average 漂白后磷石膏 74.3 74.6 74.5 74.5 漂白-煅烧后磷石膏 85.7 86.3 86.2 86.1 -
[1] 孔霞, 罗康碧, 李沪萍, 等. 硫酸酸浸法除磷石膏中杂质氟的研究[J]. 化学工程, 2012, 40(8): 65-68. https://www.cnki.com.cn/Article/CJFDTOTAL-IMIY201208016.htm
[2] 白海丹. 2019年我国磷石膏利用现状、问题及建议[J]. 硫酸工业, 2020(12): 7-10. https://www.cnki.com.cn/Article/CJFDTOTAL-LSGY202012002.htm
[3] 黄照昊, 罗康碧, 李沪萍. 磷石膏中杂质种类及除杂方法研究综述[J]. 硅酸盐通报, 2016, 35(5): 1504-1508. https://www.cnki.com.cn/Article/CJFDTOTAL-GSYT201605031.htm
[4] 杜明霞, 王进明, 董发勤, 等. 磷石膏资源化利用研究进展[J]. 矿产保护与利用, 2020, 40(3): 121-126. http://kcbh.cbpt.cnki.net/WKD/WebPublication/paperDigest.aspx?paperID=dc54bd11-04dc-4492-b3d5-7d47a866c399
[5] 钱中秋, 吴开胜, 徐建军. 磷石膏粉制备轻质抹灰石膏的可行性研究[J]. 砖瓦, 2020(11): 86-87. https://www.cnki.com.cn/Article/CJFDTOTAL-XUWA202011035.htm
[6] 王晓龙. 废渣磷石膏在建材生产中的应用解析[J]. 建材发展导向, 2020, 18(24): 92-93. https://www.cnki.com.cn/Article/CJFDTOTAL-YNJC202024051.htm
[7] 贺晓燕, 吕飞, 贺光照. 我国工业固体废弃物磷石膏预处理及综合利用[J]. 资源节约与环保, 2021(3): 114-115. https://www.cnki.com.cn/Article/CJFDTOTAL-ZYJH202103067.htm
[8] 李纯, 薛鹏丽, 张文静, 等. 我国磷石膏处置现状及绿色发展对策[J]. 化工环保, 2021, 41(1): 102-106. https://www.cnki.com.cn/Article/CJFDTOTAL-HGHB202101021.htm
[9] 石玉臣, 张恩普, 张骄, 等. 刚果(金)某难处理氧化铜钴矿硫酸浸出试验研究[J]. 有色金属工程, 2021, 11(5): 45-51. https://www.cnki.com.cn/Article/CJFDTOTAL-YOUS202105008.htm
[10] 梁芳敏. 慈竹化机浆过氧化氢漂白机理及提高漂白白度新型漂白体系[D]; 北京: 中国林业科学研究院, 2019.
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