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Method and device for processing monocalcium phosphate

A technology of calcium dihydrogen phosphate and a processing method, which is applied in the field of phosphorus chemical industry, can solve the problems of poor operation stability of the product quality device of the dry powder direct granulation method, easy agglomeration of the product, and large amount of dust, etc., so as to extend the operation cycle and increase the strength , the effect of stable quality

Active Publication Date: 2018-07-06
SINOCHEM YUNLONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a processing method and device for calcium dihydrogen phosphate, which can not only solve the problems of large amount of dust and easy agglomeration of the product in the slurry spray drying method, but also solve the problem of product quality and device operation of the dry powder direct granulation method The problem of poor stability

Method used

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  • Method and device for processing monocalcium phosphate
  • Method and device for processing monocalcium phosphate
  • Method and device for processing monocalcium phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Use P 2 o 5 The calcium carbonate slurry with a concentration of 40% defluorinated phosphoric acid and a water content of 50% is prepared in the MCP reaction tank 1 to obtain the MCP slurry, which is atomized and dried in the spray drying tower 2 to obtain a powdery MCP product, and the dry tail gas is dedusted Dust material is obtained from dedusting in room 3, which is mixed with powdered MCP product at a dry basis mass ratio of 1:10 as return material B; calcium carbonate powder with a water content of 0.01% and P 2 o 5When the concentration is 40%, the dosage of defluorophosphoric acid is adjusted according to the Ca / P ratio of 0.60, and 0.1% of ferrous fumarate and ferrous glycinate, 0.1% of sodium metabisulfite are added, and the weight ratio of the returned material C is 1:3 on a dry basis Enter primary reactor 4, reactant temperature 60 ℃, residence time 10s, obtain material D moisture content 13%, material D and return material B enter secondary reactor 5 acc...

Embodiment 2

[0045] Use P 2 o 5 The concentration is 45% defluorinated phosphoric acid and calcium hydrogen phosphate slurry with a water content of 40%. The MCP slurry is prepared in the MCP reaction tank 1, and the powdery MCP product is obtained after atomization and drying in the spray drying tower 2. The dry tail gas is passed through Dust material obtained by dedusting in dust removal room 3 is mixed with powdered MCP product at a ratio of 1:5 as return material B; calcium hydrogen phosphate powder with a water content of 3.0% and P 2 o 5 The concentration is 45%. The dosage of defluorinated phosphoric acid is adjusted according to the Ca / P ratio of 0.61. Add 0.5% ferrous carbonate and 0.5% sodium metabisulfite, and return material C to enter primary reactor 4 at a dry basis mass ratio of 1:2. , the temperature of the reactant is 70°C, the residence time is 15s, and the moisture content of the material D is 20%. The material D and the returned material B enter the secondary reactor...

Embodiment 3

[0051] Use P 2 o 5 The calcium bicarbonate slurry whose concentration is 45% defluorinated phosphoric acid and 40% water content is prepared in the MCP reaction tank 1 to obtain the MCP slurry, which is atomized and dried in the spray drying tower 2 to obtain a powdery MCP product, and the dry tail gas is passed through Dust removal room 3 obtains dust material, which is mixed with powdered MCP product at 1:1 as return material B; calcium bicarbonate powder with a water content of 1% and P 2 o 5 The concentration is 45%, the dosage of defluorophosphoric acid is adjusted according to the Ca / P ratio of 0.63, and 1.5% ferrous chloride and 1.0% sodium thiosulfate are added, and the mass ratio of the returned material C is 1:2 on a dry basis to enter the first stage Reactor 4, the temperature of the reactant is 70°C, and the residence time is 25s. The moisture content of the material D is 20%. Time 15s, obtain material E moisture content 7%, enter granulator 6 granulation, granu...

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Abstract

The invention discloses a method for processing monocalcium phosphate. The method comprises the following steps: enabling defluorinated phosphoric acid to react with calcium carbonate or calcium hydrophosphate slurry, drying through a spray drying tower to obtain a powdery MCP product, and taking a part of the powdery product and collected powder as backward materials for producing a granular MCPproduct; using defluorinated phosphoric acid to directly react with calcium carbonate or calcium hydrophosphate powder, adding the backward materials and a small amount of a granulating modifier and aferrous stabilizer, and carrying out drying and sieving after pelleting of a pelletizer so as to obtain the granular MCP product. The cooperative production of powdery and granular feed grade MCP isrealized, dust material is efficiently recycled, the intensity and uniformity of particles are improved, the pulverization of particles is avoided, and material sieving and crushing equipment blockageare effectively reduced. Moreover, the granular MCP product with the effect of supplementing phosphorus, calcium and iron is also obtained.

Description

technical field [0001] The invention relates to the technical field of phosphorus chemical industry, in particular to a processing method and device for calcium dihydrogen phosphate. Background technique [0002] Phosphorus is an important life element, and calcium phosphate salt is used as an important feed additive to provide sufficient calcium and phosphorus elements for animal bone growth. Calcium dihydrogen phosphate, as the feed grade calcium phosphate additive with the best solubility and the highest animal absorption efficiency, has been widely promoted and applied in the feed industry. [0003] There are many production methods disclosed for feed grade calcium dihydrogen phosphate (MCP). At present, wet process phosphoric acid, calcium hydrogen phosphate and calcium carbonate are mostly used as raw materials. The production methods can be divided into slurry spray drying method and dry powder direct granulation method. [0004] Slurry spray drying method is current...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32A23K20/26A23K20/20
CPCA23K20/26A23K20/30C01B25/32C01B25/321
Inventor 付全军王力刚盛勇刘庭兵马先林曾斌周佩张继松
Owner SINOCHEM YUNLONG
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