doi:10.16186/j.cnki.1673-9787.2023020070

Received:2023/02/24

Revised:2023/04/20

Published:2024/03/25

Effects of Type-Ⅱ anhydrite prepared by titanium gypsum with different methods on the properties of sulfate aluminium cement

GUAN Xuemao，ZHANG Zihan，DI Hongfeng，LIU Songhui

School of Materials Science and Engineering，Henan Polytechnic University，Jiaozuo 454000，Henan，China

Abstract: Objectives Titanium gypsum is actually a kind of industrial solid waste. In order to better study its reuse problem and figure out the effects of anhydrite on the properties of the sulfate aluminium cement clinker. Methods The titanium gypsum is taken as the raw material to prepare type Ⅱ anhydrite by pressurized hydrothermal method and acid leaching method，which is then used to figure out the effects of anhydrite synthesized by different methods on the properties of the sulfate aluminium cement. Results The anhydrite synthesized by pressurized hydrothermal method and acid leaching method has different effects on particle size，morphology，pore，surface area，and other microscopic properties.When mixing natural anhydrite and anhydrite synthesized by different methods into the sulfate aluminium cement clinker，the compressive strengths of all the sulfate aluminium cement clinkers reach the maximum at a mixing ratio of 15% for various types of anhydrite.Then with the extension of curing time，the compressive strengths of the sulfate aluminium cement clinkers increase obviously.Compared with situations of those mixed with natural anhydrite， the compressive strength of the sulfate aluminium cement clinker mixed with anhydrite synthesized by acid leaching method is lower.However，under the conditions of the same dosage of anhydrite and the same hydration time，its compressive strength is greater than those sulfate aluminium cement clinkers mixed with the other two types of anhydrites. Conclusions The application of anhydrite synthesized by pressurized hydrothermal method will be prosperous in the future.And it is also a major channel to achieve the reuse of titanium gypsum.

Key words:titanium gypsum；pressurized hydrothermal method；acid leaching method；typeⅡ anhydrite；sulphate aluminate cement clinker；compressive strength