预分解磷石膏制备贝利特-硫铝酸盐水泥

doi:10.11896/j.issn.1005-023X.2017.024.001

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Abstract The decomposition characteristics of phosphogypsum (PG) in reductive atmosphere at low temperature and oxidizing atmosphere at high temperature were investigated. The decomposed phosphogypsum as a calcium source in place of limestone was used to prepare belite-calcium sulphoaluminate cement. The results showed that the decomposition rate of PG with the ratio of C/S=2 could reach 87.69% with the calcining process of CO₂-950 ℃-1 h/air-1 200 ℃-1 h. SO₂ could be controlled to concentratedly release in the temperature range of 900－1 200 ℃.The decomposed PG with the decomposition rate of 87.69% was used to prepare BCSA cement. C₂AS was detected in the cement clinker except for C₄A₃, C₂S and C₄AF. The compressive strength of cement paste at 3 d could reach 41.4 MPa. About 0.98 t phosphogypsum is consumed for 1 t BCSA cement clinker, reducing the amount of limestone nearly 50%.

Key words： decomposed phosphogypsum decomposition characteristics piecewise calcination belite-calcium sulphoaluminate cement

Published: 25 December 2017 Online: 2018-05-08

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	Articles by authors
	LIANG Jiao
	CHU Wanyi
	HUANG Yongbo
	LI Fengling
	LIU Na
	QIAN Jueshi

Cite this article:

LIANG Jiao,CHU Wanyi,HUANG Yongbo, et al. Utilizing Decomposed Phosphogypsum for the Preparation of Belite-Calcium Sulphoaluminate Cement[J]. Materials Reports, 2017, 31(24): 1-5.

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https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.024.001 OR https://www.mater-rep.com/EN/Y2017/V31/I24/1

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