Inorganic Chemicals Industry >
Study on mechanical properties and microscopic characterization of phosphogypsum composite cementitious materials
Received date: 2024-07-19
Online published: 2024-08-12
The large stockpiles of phosphogypsum，which contain a large amount of sulfate，phosphorus，fluorine，heavy metals and other harmful substances，pose environmental risks if improperly managed.To address this issue，the CaSO4·2H2O content in phosphogypsum was leveraged，combined with slag，Ca（OH）2，and Na2SO4，to prepare phosphogypsum composite cementitious materials. their mechanical properties，hydration mechanism，microstructure，and leaching toxicity were investigated.The results showed that the compressive strength of the phosphogypsum composite cementitious material was initially decreased then increased with the addition of Ca（OH）2 and initially increased then decreased with the addition of phosphogypsum.The optimal mix ratio was 67% slag，30% phosphogypsum，3% Ca（OH）2 and 3% Na2SO4，and the compressive strength of 3 d，7 d and 28 d could reach 4.12，25.21 and 37.45 MPa，respectively.Increasing the Ca（OH）2 content accelerated the decomposition of phosphogypsum into SO₄²⁻ and Ca²⁺，which in turn promoted the breakdown of silicon-oxygen and aluminum⁃oxygen tetrahedra in the slag.These components then hydrated to form large amounts of ettringite and C-（A）-S-H gel，which interweaved to form a dense network structure.The concentrations of F- and PO43- in phosphogypsum leachate were 148.23 and 298.24 mg/L，respectively，while in the cementitious material，they were decreased to 2.34~4.32 mg/L and 0.05~0.18 mg/L，respectively.Additionally，all pollutants in the cementitious material met the GB 8978—1996 Integrated Wastewater Discharge Standard.
WANG Feng , SONG Yu , HE Zhaoyi , XIA Yuhua , BI Yanli , FENG Hao , CAO Dongwei . Study on mechanical properties and microscopic characterization of phosphogypsum composite cementitious materials[J]. Inorganic Chemicals Industry, 2025 , 57(5) : 93 -99 . DOI: 10.19964/j.issn.1006-4990.2024-0413
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