METHOD OF POTASSIUM NITRATE REGENERATION Russian patent published in 2015 - IPC C06B21/00 C30B9/02 C06B31/04 B09B3/00 C01D9/00 

FIELD: chemistry.

SUBSTANCE: invention relates to the technology of smoke black powder and can be used for the regeneration of potassium nitrate from sweepings of the gunpowder production with an expired storage term. The method includes mixing the smoke black powder to be utilised with water in a tank, heating the mixture to 90-100°C, filtration of a solution of a sulphur-coal mixture and potassium nitrate, crystallisation of the latter with constant cooling of the crystalliser, collection of potassium nitrate crystals, its centrifuging to remove the solution and drying, with the filtration being realised with a working mixer in a heated filter; crystallisation is carried out with mixing the solution by the supply of compressed air; mother liquor, which is formed in the crystalliser is pumped into a tank, heated to a temperature of 90-100°C and used to wash the residue on the heated filter, the obtained solution is re-supplied into the crystalliser and subjected to crystallisation, the precipitated sediment of potassium nitrate is removed, the solution, remaining in the crystalliser, is re-supplied for mixing with the smoke black powder to be utilised. The technical result of the invention consists in an increased output of potassium nitrate, extracted from smoke black powder.

EFFECT: method is simple and makes it possible to use industrial equipment.

1 dwg, 2 ex