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2 243 196

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Application

2004100289/15, 2004-01-12

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Start date

2004-01-12

(22)

Actual filing date

2004-01-12

(45)

Published

2004-12-27

(72)

Inventor

Klassen P.V.Chernenko Ju.D.Zavertjaeva T.I.Golous V.I.Mil'Kov G.A.Razmakhnina G.S.

(73)

Holder

Otkrytoe Aktsionernoe Obshchestvo Institut Po Udobrenijam I Insektofungitsidam Im. Prof. Ja.V. Samojlova"

METHOD OF PROCESSING PHOSPHORUS-CONTAINING WASTE INTO MINERAL FERTILIZERS Russian patent published in 2004 - IPC

Abstract RU 2243196 C1

FIELD: mineral fertilizers.

SUBSTANCE: method comprises acid treatment of phosphorus-containing component, addition of phosphorus-containing waste (phosphogypsum) to resulting pulp at weight ratio of P₂O₅ in slime to phosphogypsum 1:(4-39), followed by granulation and drying of product at 100-115^оС. Phosphorus-containing component is slime originated from production of extraction phosphoric acid and phosphate fertilizers after decomposing it with acid at solids-to-liquid ratio 1:(0.7-3.8) into free acid-containing pulp. When sulfuric acid is used in acid treatment step, resulting pulp contains 2-4% of free acid, and in case of phosphoric acid content of free acid is 1-2%.

EFFECT: enabled use of only waste materials to manufacture wide assortment of fertilizers with good physicochemical characteristics.

3 cl, 5 ex

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RU 2 243 196 C1

Authors

Klassen P.V.

Chernenko Ju.D.

Zavertjaeva T.I.

Golous V.I.

Mil'Kov G.A.

Razmakhnina G.S.

Dates

2004-12-27—Published

2004-01-12—Filed