High temperature decomposition process for producing an alkali-c

Details High temperature decomposition process for producing an alkali-c High temperature decomposition process for producing an alkali-c

1978-02-28

1979-09-11

Schor, Kenneth M.

Chemistry: fertilizers

Processes and products

Inorganic material

71 41, 423167, 423313, C05B 1110, C05B 1302

Patent

active

041674065

ABSTRACT:
An alkaline high temperature process for the production of alkali containing highly citrate soluble calcined phosphate fertilizer is disclosed. The process comprises calcining a preheated mixture comprising a crude phosphate, an alkaline decomposing agent, silicic acid and phosphoric acid in a rotary kiln at a temperature of between about 900.degree. and 1300.degree. C. The preheated mixture is prepared by introducing phosphoric acid directly into the kiln and therein contacting it with the hot precursory mixture of the remaining starting material having a temperature of between about 150.degree. to 900.degree. C. The amounts of starting materials are preferably chosen such that in the mixture 1 mole of P.sub.2 O.sub.5 is present per about 1.1 to 1.8 moles of alkali oxide, and about 0.5 moles of SiO.sub.2 are present per mole of CaO which is in excess of the amount of CaO which can be bound in the form of calcium alkali phosphate.

REFERENCES:
patent: 1799882 (1931-04-01), Brenek
patent: 2337498 (1943-12-01), Ritter et al.
patent: 3713803 (1973-01-01), Holst et al.
patent: 3802861 (1974-04-01), Holst et al.
patent: 3985537 (1976-10-01), Hauschild et al.

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