Synthesis of phosphosulphate substance and properties of its structured mixture with quartz sand

Purpose. Creation of binder based on orthophosphoric acid and aluminum sulfate, study its structure physicochemical patterns formation, determination the properties structured mixtures for needs foundry. Methodology. In work, X-ray qualitative quantitative analysis was performed Rigaku Ultima IV unit, differential thermal STA 449 C Jupiter synchronous analyzer. Orthophosphoric acid, technical thermal, 85% concentration, 18-hydrous sulfate Al2(SO4)3 18H2O quartz sand brand 3K5O3025 were used. The strength core determined US-700 unit standard cylindrical samples with a diameter height 50mm. roughness cast surfaces profilometer model 107622 computer processing obtained data construction profilograms. To determine propensity to form caking, hexagon sample used according method by M.Fedorov. Breakability 50 mm original described in text article. Findings. For first time, mechanism formation phosphates binding during interaction hydrate crystal temperature range 100200 has been investigated. is proved an intermediate phase heating hydroxide Al(OH)3, which, contrast results thermodynamic able interact acid. Formation system ortho- metaphosphates, which features ensures high filler, established. transformations binder, consists combination residual are studied. Stages gradual disintegration hydrates, new decomposition recorded. tendency burn knockout developed determined. Originality. description 100200. Practical value. A inorganic from 18-aqueous foundry production. scheme preparation involves preliminary mixing specified reagents resulting dry powder material therefore it called phosphosulfate. long shelf life introduced into mixture ready-made while technology production less energy-intensive long-lasting compared traditional metal phosphate binding.