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Study on optimization of technological conditions for preparing α high-strength gypsum from phosphogypsum by crystal conversion
Received date: 2022-01-06
Online published: 2022-11-23
Based on industrial solid waste phosphogypsum as raw material，α high-strength gypsum was prepared by semi-liquid autoclave method.By taking autoclave temperature，autoclave time，1# crystal conversion agent，2# crystal conversion agent and slurry moisture content as factors，an orthogonal test of 5 factors and 4 levels was carried out.By taking the mechanical properties as an index，the process conditions for the preparation of α high-strength gypsum by crystal conversion were optimized. The results showed that when the reaction temperature was 137 ℃，the slurry moisture content was 20%（mass fraction），the dosage of 1# crystallizing agent was 0.3%（mass fraction），the dosage of 2# crystallizing agent was 1.27%（mass fraction），and the constant temperature of reaction was 20 min，α high-strength gypsum with 2 h flexural，2 h compressive and dry compressive strengths of 7.0，21.7 and 44.7 MPa could be prepared，respectively.
Key words： phosphogypsum; α high-strength gypsum; crystal conversion
Ying ZENG , Bo YAN , Yunchun RUAN , Tao ZHANG , Rendao TIAN , Hong HU , Dengpan NIE . Study on optimization of technological conditions for preparing α high-strength gypsum from phosphogypsum by crystal conversion[J]. Inorganic Chemicals Industry, 2022 , 54(11) : 112 -117 . DOI: 10.19964/j.issn.1006-4990.2022-0010
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