Effect Of Boric Acid And Lithium Chloride On Magnesium Oxysulfate Cement

To reduce the production cost of magnesium oxysulfate cement(MOS) in western China and the Salt Lake region, the use of salt lake by-products such as magnesium slag, etc. to prepare raw materials for MOS has become an effective way. However, the raw material of MOS obtained through this route contains some impurities, mainly boron and lithium. Therefore, to study the effect of boron and lithium elements on the performance of MOS, boron acid and lithium chloride were used to study the effect of boron and lithium on the setting time and compressive strength of MOS. And the influence of boric acid and lithium chloride on the hydration products and microstructure of MOS was discussed. The results show: Additives (boric acid and lithium chloride) did not change the MOS hydration phase and the micro-morphology, but delayed the MOS hydration process and increased MOS initial setting and final setting time, resulting in a decrease of the MOS's early compressive strength, but had no effect on the MOS's later compressive strength.