1 Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lake, Chinese Academy of Sciences, Xining 810008, China 2 Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining 810008, China 3 Qinghai Agricultural Product Quality and Safety Inspection Center, Xining 810000, China
Abstract: Salt lake magnesium slag is the waste residue produced in the process of extracting lithium extraction from salt lake brine. Due to the continuous development of lithium extraction industry, a large number of magnesium residues were produced and accumulated. How to effectively utilize these magnesium slags will become the necessary condition for ecological protection and efficient production in salt lake area. Salt lake magnesium slag was used as raw material for heat treatment and physical property analysis in this study, the salt lake magnesium slag after heat treatment was reacted with KH2PO4 to prepare salt lake magnesium phosphate cement (SLMPC). The effects of heat treatment process of salt lake magnesium slag on the setting time, compressive strength, hydration products and micro morphology of SLMPC were studied. The results show that the heat treatment process has a significant impact on the physicochemical properties of salt lake magnesium slag raw materials and SLMPC. With the increase of heat treatment temperature and holding time, the main phase Mg(OH)2 of salt lake magnesium slag is gradually transformed into MgO, and its grain size and bulk density increase, specific surface area and hydration reaction activity decrease. The setting time of SLMPC slurry is extended from a few minutes to 33 minutes. The compressive strength of each age increased first and then decrease. The main hydration product was MgKPO4·6H2O. The optimum heat treatment temperature range from 1 000 to 1 100 ℃ and the holding time was 3 to 6 hours.
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2023, Vol. 37 
