METHOD OF PRODUCTION OF BIOCIDE, ZINC OXIDE AND MAGNESIUM AND CALCIUM CHLORIDE CRYSTAL HYDRATES FROM PRODUCTION WASTE Russian patent published in 2021 - IPC C22B7/00 C22B3/10 C22B19/34 C01G3/02 C01F5/30 C01F11/24 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of production of biocide and other products based on industrial waste, which can be used in various coatings protective against biological effects. Slurry from etching of brass with hydrochloric acid and dolomite carry-over dust are processed producing zinc oxide, magnesium and calcium chloride crystal hydrates and a biocide - copper oxide. The slurry is mixed with zinc oxide in a reactor with distilled water producing a suspension, which is then filtered producing residual copper oxide and a first filtrate. The residue is washed, then dried and ground in an environment of stack from burning natural gas with a lack of oxygen producing a biocide - monovalent copper oxide. The first filtrate is mixed with dolomite carry-over dust in the reactor producing a suspension, which is then filtered producing residual zinc oxide with an admixture of chlorides and a second filtrate. The residue is washed, then dried and ground producing zinc oxide. The second filtrate is cooled producing magnesium chloride crystal hydrate, which is separated by centrifuge. After separation of the magnesium chloride crystal hydrate from the filtrate it is dried and cooled producing calcium chloride crystal hydrate with a particle size of 200 to 250 mcm.

EFFECT: method allows producing high quality biocide, zinc oxide and magnesium and calcium chloride crystal hydrates.

1 cl, 1 dwg, 1 tbl