收稿日期: 2023-03-16
网络出版日期: 2023-11-16
基金资助
美丽中国生态文明建设科技工程专项(XDA23030301)
Preparation of α-hemihydrate gypsum from phosphogypsum by flotation and atmospheric trans-crystallization in solution
Received date: 2023-03-16
Online published: 2023-11-16
为了实现磷石膏的高值化利用，以湖北某地磷石膏为原料，采用泡沫浮选-常压Na2SO4溶液转晶法制备α-半水石膏。结合SEM-EDS、XRF、XRD、FT-IR、TG-DSC、白度测试与力学强度分析等手段表征产物形貌、组成与力学性能。结果表明：产物尺寸均匀、长径比为1.50±0.271；产物建材白度为84.6%，纯度高于95%；原料中大部分Si、F和P类杂质得以脱除，达到磷石膏用于石膏建材原料GB/T 23456—2018《磷石膏》中的I级磷石膏要求；转晶产物烘干抗压强度、2 h抗折强度分别高于36.3、7.7 MPa，满足相关国家标准与行业标准对高强石膏力学强度等级的要求。实验证明该工艺可以制备出高白度、高纯度和高强度的α-半水石膏，实现了磷石膏的无害化与资源化。
刘超 , 范垂钢 , 刘润国 , 于冬雪 , 李松庚 . 磷石膏浮选-常压盐溶液转晶制备α-半水石膏[J]. 无机盐工业, 2023 , 55(11) : 107 -114 . DOI: 10.19964/j.issn.1006-4990.2023-0063
In order to realize the high value utilization of phosphogypsum，froth flotation-atmospheric Na2SO4 solution crystallization method was used to convert phosphogypsum sampled from Hubei province into α-hemihydrate gypsum.The morphology，composition and mechanical strength of the product were characterized through various characterization methods（like SEM-EDS，XRF，XRD，FT-IR，TG-DSC，whiteness test and mechanical strength test）.Experimental data revealed that the final product had uniform particle size with aspect ratio of 1.50±0.271.Whiteness and purity（based on CaSO4） of the product was found to be around 84.6% and 95%，respectively.Most of the Si，F and P impurities was removed during the treatment，and final impurity level met the requirement of Grade I phosphogypsum in the National Standard GB/T 23456—2018 as the raw material of gypsum building materials.The compressive and 2 h flexural strength of hardened body of the crystallized product were higher than 36.3 MPa and 7.7 MPa，respectively，which met the requirements of the relevant national and industrial standards for the mechanical strength grade of high strength gypsum.The research was illustrated that α-hemihydrate gypsum with high whiteness，high purity，and high mechanical strength could synthesize by the process，and could be considered as a potential option for phosphogypsum.
Key words： phosphogypsum; α-hemihydrate gypsum; flotation; saline solution; crystal modifier
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