Production method of feed-grade calcium hydrogen phosphate

Abstract

The invention provides a production method of feed-grade calcium hydrogen phosphate. The method is characterized by comprising the following steps: stirring and mixing phosphoric acid, water, diatomite and sodium sulfate, carrying out filter pressing to obtain a mixture; stirring and dissolving sodium sulfate and water, carrying out cyclic heavy component removal, mixing the solution with the mixture obtained by filter pressing to carry out reactions, then carrying out curing and pile turning, and finally, carrying out granulation and drying to obtain a product. A reasonable feed-grade calciumhydrogen phosphate production method suitable for large-scale production is developed by designing the whole process flow, and the product produced by the method meets the GB / T22549-2008 standard.

Description

technical field [0001] The invention relates to the technical fields of chemistry and metallurgy, in particular to a production method of feed-grade calcium hydrogen phosphate. Background technique [0002] Feed-grade calcium hydrogen phosphate refers to calcium hydrogen phosphate that can be used as a phosphorus and calcium supplement in feed processing, because the ratio of phosphorus to calcium in it is the closest to the ratio of phosphorus to calcium in animal bones, and it can be completely dissolved in animal stomach acid. Feed grade calcium hydrogen phosphate is one of the best feed mineral additives recognized at home and abroad at present. It can accelerate the growth and development of livestock and poultry, shorten the fattening period, and increase weight quickly; Poultry's ability to resist disease and cold can prevent and treat rickets and pullorum in livestock and poultry. [0003] At present, wet process and dry process are commonly used at home and abroad ...

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Problems solved by technology

[0003] At present, wet process and dry process are commonly used at home and abroad to produce feed grade calcium hydrogen phosphate. Among them, the wet process is to add solid raw materials to the phosphoric acid solution prepared by wet process to generate calcium hydrogen phosphate soluble in water, which is concentrated by vacuum , cooling crystallization, and precipitation of calcium hydrogen phosphate crystals, then drying, crushing, and sieving to obtain the product. This method has the disadvantages of long process flow, large loss of phosphorus, high energy consumption, large investment, small production capacity, and high cost. Dry process It is the reaction of phosphoric acid obtained by thermal method with solid materials such as calcium carbonate to obtain calcium hydrogen phosphate slurry, and then obtain products by drying, crushing, sieving, etc. The nutritional content of feed grade calcium hydrogen phosphate produced in the prior art is not high , low phosphorus content, low water-soluble content

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