METHOD FOR PRODUCING CALCIUM PYROPHOSPHATE POWDER Russian patent published in 2017 - IPC C01B25/42 C01B25/32 C01F11/00 B82Y40/00 

FIELD: chemistry.

SUBSTANCE: method for producing a calcium pyrophosphate powder comprising the preparation and reaction of aqueous solutions containing calcium ions, pyrophosphate ions and ammonium ions, the precipitation of the precipitate in the mother liquor for 30-60 minutes, filtration, drying, disaggregation, heat treatment in the range of 300-600°C for 2-4 hours. After preparing a solution containing pyrophosphate ions, it is mixed with an ion exchange resin in H⁺-form at a ratio of "ion exchange resin/salt mass" in the range of 3-5 for 30-60 minutes, the concentration of the solution containing pyrophosphate ions being 0.1 M - 0.5 M. Then, the resin is separated by filtration, an equal volume of calcium salt solution is added to the resulting solution, taken in an amount providing a ratio of Ca/P=1, and the pH of the produced solution is changed to precipitation.

EFFECT: producing powder with particles with a shape close to equiaxed, 100-200 nm in size, providing powder activity in various processes.

4 cl, 7 dwg, 1 tbl, 5 ex