化工环保2025，Vol.45Issue(2)：255-260,6.DOI:10.3969/j.issn.1006-1878.2025.02.013
矿渣-硅灰-磷石膏基骨料的制备及性能
Preparation and properties of slag-silica fume-phosphogypsum-based aggregate
摘要
Abstract
Artificial aggregates were synthesized using a mixture of slag,silica fume,and phosphogypsum,and the formulation of slag-silica fume-phosphogypsum-based artificial aggregates was optimized to investigated the influence of dry density on the fluorine and phosphorus content in the leachate,as well as the performance of the aggregates.The morphological and structural characteristics of the aggregates were examined.Experimental results showed that when the formulation consisted of 80%(w)phosphogypsum,5%(w)cement,6%(w)slag,and 9%(w)silica fume,the prepared slag-silica fume-phosphogypsum-based aggregates has a cylinder compressive strength of 5.34 MPa,water absorption rate of 8.4%within one hour,and the bulk density of 929 kg/m3 after cured for 28 days,meeting the medium density grade 1 000 requirements outlined in GB/T 17431.1-2010.As the dry density of the aggregates increases,the phosphorus and fluorine content in the leachate decreased significantly.When the dry density exceeds 1.85×103 kg/m3,phosphorus is no longer detectable in the leachate.For dry densities between 1.10×103 and 2.10×103 kg/m3,the fluorine content ranges from 3.57 to 4.48 mg/L.Characterization results indicate that the slag-silica fume-phosphogypsum-based aggregate contains significant amounts of calcium silicate hydrate gel,insoluble eutectic phosphorus,and small quantities of ettringite and crystalline calcium silicate hydrate.These compounds are dispersed,interwoven,and filled within the aggregate microstructure,contributing to improved aggregate strength and suppressing the release of phosphorus and fluorine.关键词
磷石膏/硅灰/骨料/可溶磷/可溶氟Key words
phosphogypsum/silica fume/aggregate/soluble phosphorus/soluble fluorine分类
环境科学引用本文复制引用
马彦涛,房小健,黄绪泉,张均龙,王再骞,孙正华..矿渣-硅灰-磷石膏基骨料的制备及性能[J].化工环保,2025,45(2):255-260,6.基金项目
中国电力工程顾问集团中南电力设计院有限公司科研项目(DG2-P01-2023). （DG2-P01-2023）
