Method for continuously producing feed-grade dibasic calcium phosphate

Abstract

The invention relates to a method for continuously producing feed-grade dibasic calcium phosphate, belongs to the field of phosphorus chemical industry, and aims to solve the technical problem for providing a method for continuously producing feed-grade dibasic calcium phosphate dicalcium phosphate. The method includes chemical units of a, performing reaction on hydrochloric acid and phosphate rock, and filtering, washing and obtaining a solution 1; b, adding calcium carbonate into the solution 1, filtering, washing and obtaining a solution 2, drying the filter cake, and obtaining fertilizer-grade dibasic calcium phosphate; c, adding the calcium carbonate and lime into the solution 2, filtering, washing and obtaining a solution 3, drying the filter cake, and obtaining the feed-grade dibasic calcium phosphate; and d, adding the lime into the solution 3, and filtering to obtain a calcium chloride solution. According to the method for continuously producing the feed-grade dibasic calcium phosphate, the whole process, from feeding the raw material to discharging products, are continuous production, and the method has the advantages that production continuity is provided, device efficiency is high, and product quality is stable.

Description

technical field [0001] The invention relates to a method for continuously producing feed grade calcium hydrogen phosphate, belonging to the field of phosphorus chemical industry. Background technique [0002] Feed grade calcium hydrogen phosphate is an excellent mineral additive for poultry and livestock feed containing phosphorus and calcium. The hormones, enzymes and vitamins needed to maintain the ratio of phosphorus to calcium in the bones, thereby preventing various diseases caused by calcium deficiency in animals, and at the same time promoting the rapid growth of animal bodies, increasing the weight of poultry to increase meat and milk production , egg production, and can also treat rickets, rickets, anemia, etc. of livestock. [0003] According to the types of raw materials used to extract phosphate rock, the traditional process of feed grade calcium hydrogen phosphate in my country can be divided into three categories: sulfuric acid method, hydrochloric acid method...

AI Technical Summary

Problems solved by technology

[0010] Disadvantages: The amount of tail gas is large when the hot gas flow is concentrated and defluorinated, the tail gas absorption system is much larger than that of vacuum concentration, and the utilization of the absorption liquid is also more complicated

[0014] Disadvantages: The phosphorus yield of the product is not high (related to the quality of phosphate rock), and a considerable part of phosphorus enters the fertilizer grade product

[0015] 3. Deep defluorination of wet-process phosphoric acid without filtration

[0018] Disadvantages: The concentration device of wet-process phosphoric acid is added, which increases the investment, and the technical difficulty increases; the evaporation system requires a large amount of evaporation, the production cost increases, and the market competitiveness decreases

[0022] Disadvantages: high grade requirements for phosphate rock; more impurities in the product, complicated impurity removal process in the later stage;

[0029] The disadvantages are: fertilizer-grade phosphate has low active ingredients, high impurity content, and low economic added value of the product; the operating environment is harsh during the production process

[0033] Disadvantages: higher requirements on the grade of phosphate rock; a large amount of by-product calcium chloride waste liquid is discharged during the production process; the product quality is unstable, and the content of some metal elements (such as arsenic and lead) exceeds the standard

[0037] Disadvantages: There is a large amount of solid waste discharge; there is a large amount of waste liquid discharge in the production process

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