Influence of SrO on Properties of Clinker in Cement Production with Solely Waste Slags

Abstract

Abstract: The technology of dry cement production with solely waste slags developed by Xinjiang Tianye (Group) Co., Ltd uses 100% calcium carbide slag from PVC industry, lime residue, dedusting ash and more than ten types of other waste slags to manufacture cement, implementing the full resource utilization of industrial solid waste. It is found that the raw materials contain a small amount of SrO, which may affect the properties of clinker. By using chemical composition analysis, X-ray diffraction and Rietveld full spectrum fitting, the raw meal and clinker were analyzed, and the mechanical strength of clinker was tested. With varied content of SrO in raw meal, the changes of mineral phases and liquid phase were simulated with a thermodynamic simulation software. The results show that the additional of a small amount of SrO into raw meal can promote the formation of C₃S, C₄AF and other mineral phases, and greatly improve the early mechanical strength of clinker. However, the effect on the later strength is not so obvious.With the increase of SrO content, the content of C₃S in clinker increases, which is beneficial for the formation of iron minerals, but the content of free calcium oxide increases. Therefore, it is necessary to control the addition of SrO and the mass fraction of SrO between 0.2% and 1.0%, which is beneficial for the clinker quality.

Key words: waste slag, cement, SrO, clinker, strength, thermodynamic simulation

CLC Number:

TQ172

SONG Xiaoling, TANG Jianjian, XU Panpan, YANG Zhong, HUANG Dong, HU Jingping, ZHANG Kun, LUO Guangqian, HOU Huijie, LIU Bingchuan. Influence of SrO on Properties of Clinker in Cement Production with Solely Waste Slags[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(11): 3685-3692.

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