Method for continuously producing feed-grade dibasic calcium phosphate

A calcium hydrogen phosphate, feed-grade technology, applied in the field of phosphorus chemical industry, can solve problems such as low economic added value, increased investment, unstable product quality, etc., and achieve compact production process connection, improved production efficiency, and good appearance Effect

Active Publication Date: 2014-01-08
四川省化工设计院
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 decrea

Method used

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  • Method for continuously producing feed-grade dibasic calcium phosphate
  • Method for continuously producing feed-grade dibasic calcium phosphate
  • Method for continuously producing feed-grade dibasic calcium phosphate

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0082] Embodiment 1 adopts the inventive method to continuously produce feed grade calcium hydrogen phosphate

[0083] a. Acid hydrolysis reaction: Mix 13700kg of hydrochloric acid with a concentration of 25wt% and 5850kg of phosphate rock in a continuous and uniform unit time (the phosphate rock is first mixed with water at a weight ratio of 2:1 and ground), and then React at 50°C for 60 minutes, add polyacrylamide (molecular weight > 8,000,000) with a concentration of 3wt‰, filter, wash, and wash at a rate of 1.5m 3 / h, combined filtrate and washings to obtain solution 1;

[0084] b. One-stage neutralization: continuously and uniformly add 650kg calcium carbonate powder (calcium carbonate mixed with water at 3:16 by weight) to solution 1 continuously and uniformly within a unit time, react at 55°C for 1.5h, and the pH of the solution is 1.0, add polyacrylamide (molecular weight >8,000,000) with a concentration of 3wt‰, filter, wash, and wash at a rate of 2m 3 / h, merge fil...

Example Embodiment

[0095] Embodiment 2 adopts the inventive method to continuously produce feed grade calcium hydrogen phosphate

[0096] a. Acid hydrolysis reaction: Mix 12200kg of hydrochloric acid with a concentration of 28wt% and 5850kg of phosphate rock continuously and uniformly within a unit time (the phosphate rock is mixed with water at a weight ratio of 3:2 and ground), and then React at 55°C for 70 minutes, add polyacrylamide (molecular weight > 8,000,000) with a concentration of 4wt‰, filter, wash, and wash at a rate of 2m 3 / h, combined filtrate and washings to obtain solution 1;

[0097] b. One-stage neutralization: Add 700kg of calcium carbonate (prepared by mixing calcium carbonate with water in a weight ratio of 3:17) to solution 1 continuously and evenly per unit time, react at 55°C for 110min, and the pH of the solution is 1.3. Add polyacrylamide (molecular weight greater than >8,000,000) with a concentration of 4wt‰, filter, wash, and wash at a rate of 2.5m 3 / h, merge filt...

Example Embodiment

[0108] Embodiment 3 adopts the inventive method to continuously produce feed grade calcium hydrogen phosphate

[0109] a. Acid hydrolysis reaction: Mix 11,400kg of hydrochloric acid with a concentration of 30wt% and 5,850kg of phosphate rock in a continuous and uniform unit time (the phosphate rock is mixed with water at a weight ratio of 7:3 and ground), and then React at 55°C for 80 minutes, add polyacrylamide (molecular weight greater than >8,000,000) with a concentration of 4wt‰, filter, wash, and wash at a rate of 2m 3 / h, combined filtrate and washings to obtain solution 1;

[0110] b. One-stage neutralization: Add 750kg of calcium carbonate (calcium carbonate is mixed with water in a weight ratio of 1:4) to solution 1 continuously and uniformly within a unit time, react at 55°C for 2 hours, and the pH of the solution is 1.2. Add polyacrylamide (molecular weight greater than >8,000,000) with a concentration of 4wt‰, filter, wash, and wash at a rate of 3m 3 / h, the filt...

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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...

Claims

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Application Information

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IPC IPC(8): C01B25/32C01F11/28
Inventor 王后荣张运德朱建华杨俊康刘涛李劲伟
Owner 四川省化工设计院
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