SU1375231A1 - Method of feed dicalciumphosphate from pure and fluorine-free wet-process phosphoric acid - Google Patents

Abstract

The invention relates to the technology for the production of feed dicalcium phosphate in the acid processing of natural phosphates. The purpose of the invention is to increase the filtration rate and nutritional value. The defluorinated extraction phosphoric acid is mixed with a solution containing calcium and ammonia. Dicalcium phosphate precipitated is additionally washed with evaporated seawater containing 3-5% sodium, 5-8% chlorine, 0.8-1.5% magnesium, and 3-4.5% sulfur. The method allows filtering rate to be tO- 15%. $ (L

Description

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11375231

The invention relates to a process for the production of feed dicalcium-ospate in the acidic processing of natural phosphates.

The purpose of the invention is to increase the filtration rate and increase the nutritional value of the finished product.

The method is carried out as follows.

Example 1. 3,972 tons of purified and defluorinated extraction phosphoric acid containing, g / l: PyOs 170; 4 16; CaO 1.4; F 0.4, mixed with 2.845 tons of calcium nitrate solution containing, g / l: CaO 140; F 0.07; 0.03, and 0.082 tons of ammonia is added to pH 4.5. The process is carried out for 1 h at 70 ° C. The mixture is filtered and 1.6 t of dicalcium phosphate precipitate is separated. On the filter, on the sediment of dicalcium phosphate, pre-stripped one seawater is fed. The evaporation of seawater is carried out in an evaporator at a boiling point to a salt content of 11.8% by weight.

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including Na-3; SG5; Mg 0.8; SO 3 wt.%. Wash water is filtered. Filtration capacity 1.5 t / m h dry sediment.

The result is 1.73 tons of strong sediment, after drying at 100 s, a dry product is obtained in a quantity of 1.091 tons with a bulk density of 1.3 g / cm 3, composition,%: PiOs 45; Ca 29.5; F 0.1; Na 2; APS; SO; 2; Mg- 0.5.

And p and m 2. p. The process is carried out analogously to example 1. After receiving

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1.6 tons of wet sediment of dicalcium phosphate on the filter, on the precipitate of dicalcium phosphate, serves pre-evaporated seawater. The evaporation of seawater is carried out in an evaporator at a boiling point to a salt content of 19% by weight, incl. Na 3; SG 8; -Mg 1.5; SO; 4.5 wt.%. Wash water is filtered. Filtration capacity of 1.7 t / m h of dry residue. ;

The result is 1.9 tons of wet sediment, after drying which at 100 ° C, a dry product is obtained in an amount of 1.25 tons with a bulk density of 1.5 g / cm 3, composition,%: 44; Ca 28.5; F 0.15; Na 2.5; SG 4; Mg 0 0.9; so; 2.5

Claims (1)

Invention Formula five The method of obtaining feed dicalcium phosphate from purified and defluorinated phosphoric acid by mixing it with a solution containing calcium and ammonia, separating the precipitate of dicalcium phosphate from the solution by filtration, followed by drying it, about tl and h ay y and, in order to increase the filtration rate and increase the nutritional value of the finished product, the precipitate of dicalcium phosphate is additionally washed with one stripped off seawater containing 3-5% sodium, 5-8% chlorine, 0.8-1.5% magnesium and 3 - 4.5% sulfur .