Method for producing feed-grade calcium phosphate

Abstract

The invention discloses a forage level calcium phosphate production method, comprising that excess phosphoric acid and rock phosphate are added into a reactor to react mixedly; the calcium dihydrogenphosphate material containing fluorine and phosphoric acid; the material is added into a drier to be dried and defluorinated, and the forage level calcium phosphate is made. The forage level calcium phosphate production method has the advantages of fast defluorination, high efficiency, resource saving, low cost, friendly environment, energy saving and emission reducing, which brings the industrialrevolution of forge phosphate.

Description

Technical field:

[0001] The invention relates to a production method of feed-grade calcium phosphate, specifically using excess phosphoric acid to completely acidolyze phosphate rock to convert fluoride in the phosphate rock into HF and SiF 4 、H 2 SiF 6 The form, the material is dried by spray dryer at high temperature, HF, SiF 4 、H 2 SiF 6 Escape together with water vapor to obtain acidic defluorinated calcium phosphate dry powder, and then neutralize excess phosphoric acid in the dry powder to produce feed grade calcium phosphate. Background technique:

[0002] At present, most of the methods for producing feed-grade calcium phosphate in the world use wet-process phosphoric acid, and the harmful impurity fluorine contained in wet-process phosphoric acid must be removed. According to the different methods of phosphoric acid defluorination, there are three processes, one is chemical defluorination of wet-process phosphoric acid to produce calcium phosphate; the other is...

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