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2 156 754

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IPC

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Application

99113731/12, 1999-07-01

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Start date

1999-07-01

(22)

Actual filing date

1999-07-01

(45)

Published

2000-09-27

(72)

Inventor

Dmitrevskij B.A.Dremov A.V.Rjazanova V.V.Starodubtsev L.A.Treushchenko N.N.Jur'Eva V.I.

(73)

Holder

Obshchestvo S Ogranichennoj Otvetstvennost'Ju

METHOD OF PRODUCTION OF GRANULATED NEUTRALIZED SUPERPHOSPHATE Russian patent published in 2000 - IPC

Abstract RU 2156754 C1

FIELD: inorganic fertilizers. SUBSTANCE: invention relates to processing technology of pour phosphate raw, in part, dolomitized and iron-containing phosphate raw from layers of phosphate ores containing large amount of acid-soluble impurities to granulated neutralized superphosphate. Method of production of granulated neutralized superphosphate involves decomposition of phosphate raw with sulfuric acid, two-stage neutralization of pulp firstly with phosphate raw to pH 2-2.5 and the second neutralization stage is carried out with ammonia and/or salt solution with pH 4.6-10 to pH 3.6-6. Method provides increase of total sum of nutrient substances in fertilizer to 24.8-31%, yield of commercial fraction is 95-98%. EFFECT: improved method of production, increased content of nutrient substances and commercial fraction. 1 tbl, 5 ex

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RU 2 156 754 C1

Authors

Dmitrevskij B.A.

Dremov A.V.

Rjazanova V.V.

Starodubtsev L.A.

Treushchenko N.N.

Jur'Eva V.I.

Dates

2000-09-27—Published

1999-07-01—Filed