PHOSPHATE COMPOUNDS PRODUCTION FROM THE PHOSPHORUS AND AT LEAST A METAL CHOSEN FROM IRON AND ALUMINUM CONTAINING MATERIALS Russian patent published in 2018 - IPC C02F11/00 C01B25/22 C01B25/238 C01B25/46 C05B11/12 C05B11/16 C05F7/00 

FIELD: chemistry.

SUBSTANCE: invention relates to the phosphorus and at least one metal containing materials processing, as well as to the aimed at recycling processing. Described is the phosphate compounds concentration method, comprising the stages of: dissolving the feedstock containing the sewage sludge ashes containing phosphorus and at least one metal selected from iron and aluminum in the liquid containing at least hydrochloric acid; separation of the produced in the said dissolution stage insoluble residues, thereby forming the first leaching solution; wherein the said first leaching solution has phosphorus to the total iron (III) and aluminum content molar ratio; controlling the said molar ratio so, that it was greater than 1; adding a base to the said first leaching solution after the said insoluble residues separation stage, causing the containing at least one metal selected from iron and aluminum phosphate compounds precipitation from the said first leaching solution; removing the said precipitated phosphate compounds from the said first leaching solution; adding sulfuric acid to the said first leaching solution after the said precipitated phosphate compounds removal stage causing the sulfate compounds precipitation; said precipitated sulfate compounds separation from the said first leaching solution; and at least a portion of the said leaching solution recycling after the said separation stage of the said precipitated sulfate compounds as the said liquid, containing at least hydrochloric acid, in the said stage of the sewage sludge ash dissolving. Also described are the phosphate compounds preparation method, phosphate compounds concentration system and the phosphate compounds preparation system.

EFFECT: technical result: disclosed is the phosphorus isolation efficient method.

28 cl, 35 dwg, 19 tbl