METHOD OF EXTRACTING PHOSPHORUS FROM IRON-CONTAINING WASTE PRODUCTS OF VYATSKO-KAMSK PHOSPHORITES Russian patent published in 2009 - IPC C05B11/06 C01B25/30 

FIELD: construction industry.

SUBSTANCE: method of utilising phosphorus from iron-containing wastes formed during nitric-acid processing of Vyatsko-Kamsk phosphorites to fertilisers as per nitric-acid technology involves processing of wastes with mixture of nitric and sulphuric acids, separation of the obtained calcium sulphate by filtering, introduction of NaOH solution to the rest solution, bringing pH value to values not less than 12, sediment detachment of ironic hydroxide (III) by filtering and return of the rest solution containing sodium phosphate to the process of obtaining fertilisers. The obtained solution includes sodium phosphate without iron compounds, and sediment is iron hydroxide containing phosphorus compounds in quantity of 1-1.5% of the one taken for being processed.

EFFECT: method allows extracting phosphorus from wastes of nitric-acid processing of Vyatsko-Kamsk phosphorites thus obtaining useful product for being used in fertiliser producing methods.

1 tbl, 1 ex