Аннотация:The feasibility of producing high-quality zinc phosphate cement based ona frit-sintered mixture of ZnO, SiO2, MgO, and Bi2O3 oxides, with the addition ofphosphorous slag and an aqueous solution of orthophosphoric acid as the mixing liquid,was demonstrated. The raw materials used for zinc phosphate cement preparationwere investigated using various physicochemical analysis methods. It was found thatthe phosphorous slag contains silicon oxide (37.6%), aluminum oxide (4.49%), calciumoxide (42.4%), magnesium oxide (2.19%), as well as fluorine (1.94%) and calciumfluoride (4.91%). The slag predominantly consists of an amorphous glassy phase withminor inclusions of crystalline components. During the sintering process, the additionof 1.5–3.0 wt.% phosphorous slag to the frit promotes the formation of low-meltingeutectics due to the presence of fluorides, resulting in a 100 ◦ C reduction in the sinteringtemperature. An optimal zinc phosphate cement powder composition was developed,comprising: ZnO—83.0%, MgO—9.0%, SiO2—3.5%, Bi2O3—3.0%, and phosphorousslag—1.5%. The resulting sintered product exhibited a whiteness of 97.8%, whichexceeds that of the reference sample by 2.6%. Upon mixing the powder with themixing liquid, zinc ions are released first, initiating a chemical reaction that leads to theformation of zinc, magnesium, and aluminum phosphates. The compressive strengthof the resulting composite cements ranged from 101.8 to 111.9 MPa, fully complyingwith the requirements for cement grade as specified in GOST 31578-2012.
