SU1479412A1 - Method of producing feed dicalcium phosphat - Google Patents

Abstract

The invention relates to the field of production of feed dicalcium phosphate and makes it possible to increase the yield of the finished product while simultaneously increasing the P ₂ O ₅ in it in an assimilable form. The method is carried out by neutralizing extraction phosphoric acid with ammonia in the presence of calcium nitrate, separating impurities by filtration, treating 50-80% of the filtrate formed with a solution of calcium nitrate neutralized with ammonia to PH 10-11, keeping the suspension for 10-13 minutes. and introducing into it the rest of the filtrate, followed by separation of the dicalcium phosphate and its drying. The content of P ₂ O ₅ in digestible form in the product is 49.2-51.3%, the yield is 5.1-5.5 m ² / h. 1 tab.

Description

one

The invention relates to the preparation of dicalcium phosphate, suitable for use in agriculture for animal nutrition.

The purpose of the invention is to increase the yield of dicalcium phosphate while simultaneously increasing its content in a digestible form.

Example. 100 kg of phosphoric acid, pre-defluorinated soda and containing,%: Рг05 22, CaO 0.4, F 0.3 - process 5 kg of ammonia and 1.85 kg of calcium nitrate. The resulting mass in the amount of 106.85 kg is filtered and the precipitate of impurities is separated. 96 kg of purified filtrate containing, kg: Pg05 18.7, CaO 0.1, F 0.05 are divided into two streams. 48 kg (50% of the total) of the solution is mixed with 93.4 kg of the neutralized calcium-containing solution (88.6 kg of the 70% calcium nitrate solution, treated with 4.8 kg of ammonia to pH 1C). The obtained 141.4 kg of the mass is kept for 10 minutes and mixed with the remaining amount (48 kg) of the filtrate. The suspension in the amount of 189.4 kg is filtered with the separation of 139.4 kg of filtrate and 45.2 kg of sediment. After washing and drying the precipitate, 36.5 kg of feed dicalcium phosphate are obtained. The content in the product in an assimilable form is 49.2%, which is 6.3-2.1% higher than in the known method. The removal of the wet washed dicalcium phosphate precipitate is 5.2 tons / (m2 h), which is 1.1 -. 1.9 tons more than in the known method.

The table shows data on the dependence of the content of P: 0 in the assay e3 $

with

4 N3

my form in the product and the yield of pycium phosphate on the technological parameters of the process.

From the data presented in the table, it follows that, beyond the limits of the stated regime parameters (experiments 4–7), the process indicators deteriorate.

Claims (1)

The application of the proposed method allows to increase the content in digestible form in the finished product to 49.2-51.3% with the removal of 5.1-5.2 m2 / h of dicalcium phosphate precipitate, which exceeds the corresponding figures in the prototype method. Invention Formula The method of obtaining feed dicalcium phosphate, including neutral extraction of phosphoric acid with ammonia in the presence of calcium nitrate, separation of impurities by filtration, treatment of the filtrate with calcium nitrate solution neutralized with ammonia to pH 10-11, separation of dicalcium phosphate precipitate, washing and drying, characterized in that, in order to increase the yield of dicalcium phosphate while increasing its content is in an assimilable form; initially, 50–80% of the filtrate of its total amount is fed to the treatment, the resulting suspension is kept for 10–30 min and mixed with the remaining The number of the filtrate. eleven 1 Formation of small crystals due to high pH, crystallization of triammonium phosphate Formation of small crystals, low crystallization of monocalcium phosphate 3) The formation of small crystals due to lack of time for their growth four) Diverse crystals due to their fragmentation