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Method for producing feed-grade calcium hydrophosphate from high-silica phosphorite

A technology of calcium hydrogen phosphate and high silicon phosphate rock, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of increasing product production costs, increasing raw material consumption, and high fluorine impurities, and achieving increased production costs, The method is simple and the effect of reducing the impact

Inactive Publication Date: 2017-06-13
SICHUAN LOMON PHOSPHORUS CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when low-grade phosphate rock is used, because there are too many impurities in the mother liquor, the filter cake drying material after neutralization of the mother liquor is low in phosphorus and calcium, while the impurities of silicon, aluminum and fluorine are high, so it is impossible to add too much feed-grade calcium hydrogen phosphate In the finished product, it cannot be recycled completely, resulting in product loss, thereby increasing the consumption of raw materials and increasing the production cost of the product

Method used

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  • Method for producing feed-grade calcium hydrophosphate from high-silica phosphorite
  • Method for producing feed-grade calcium hydrophosphate from high-silica phosphorite
  • Method for producing feed-grade calcium hydrophosphate from high-silica phosphorite

Examples

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Embodiment 1

[0037] Produce feed grade calcium hydrogen phosphate product A with low-grade phosphate rock according to the following method:

[0038] (1) Take phosphate rock (P 2 o 5 =24.23%, SiO 2 =13.21%, MgO=1.5%), after pre-crushing, add it to the ball mill to crush and grind until the passing rate of 100 mesh sieve is greater than 80%, the qualified pulp is added to the extraction tank, add 98 acid, control the rate of 98 acid addition to maintain the extraction tank slurry The temperature is 85°C. After fully reacting, filter to obtain wet-process phosphoric acid.

[0039] (2) Add wet-process phosphoric acid into a neutralization tank, start stirring, and slowly add calcium carbonate to the above-mentioned wet-process phosphoric acid to carry out acid-base neutralization reaction. Slurry.

[0040] (3) Press filter the slurry after the primary neutralization, the filter residue is used for the production of fertilizer grade calcium hydrogen phosphate, and the primary filtrate ente...

Embodiment 2

[0048] Produce feed grade calcium hydrogen phosphate product B with low-grade phosphate rock according to the following method:

[0049] (1) Take phosphate rock (P 2 o 5 =24.23%, SiO 2 =13.21%, MgO=1.5%), after pre-crushing, add it to the ball mill to crush and grind until the passing rate of 100 mesh sieve is greater than 80%, the qualified pulp is added to the extraction tank, add 98 acid, control the rate of 98 acid addition to maintain the extraction tank slurry The temperature is 85°C. After fully reacting, filter to obtain wet-process phosphoric acid.

[0050] (2) Add wet-process phosphoric acid into a first-stage neutralization tank, start stirring, and slowly add calcium carbonate to the above-mentioned wet-process phosphoric acid to carry out acid-base neutralization reaction, the pH of the reaction end point is 2.0, and a slurry after primary neutralization is obtained.

[0051] (3) Press filter the slurry after the primary neutralization, the filter residue is us...

Embodiment 3

[0059] Produce feed grade calcium hydrogen phosphate product C with low-grade phosphate rock according to the following methods:

[0060] (1) Take phosphate rock (P 2 o 5 =24.23%, SiO 2 =13.21%, MgO=1.5%), after pre-crushing, add it to the ball mill to crush and grind until the passing rate of 100 mesh sieve is greater than 80%, the qualified pulp is added to the extraction tank, add 98 acid, control the rate of 98 acid addition to maintain the extraction tank slurry The temperature is 85°C. After fully reacting, filter to obtain wet-process phosphoric acid.

[0061] (2) Add wet-process phosphoric acid into a neutralization tank, start stirring, slowly add calcium carbonate to the above-mentioned wet-process phosphoric acid to carry out acid-base neutralization reaction, and start heating at the same time to raise the temperature to 50°C, and the reaction end point pH=2.0. Insulate for 30 minutes, and keep stirring during the insulated period to obtain a neutralized slurry....

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Abstract

The invention relates to a production method of feed-grade calcium hydrogen phosphate, and specifically discloses a method for producing feed-grade calcium hydrogen phosphate from high-silicon phosphate rock. This method destroys the stability of the silicon colloidal impurities in the filtrate by heating in the second-stage neutralization reaction or the first-stage and second-stage neutralization reactions, and combines the coagulant to precipitate the silicon-based colloids, thereby preventing the colloidal impurities from entering the main neutralization reaction. , Improve product quality. Advantages of the present invention are: 1) provide a kind of method that feed grade calcium hydrogen phosphate is produced by high-silicon phosphate rock, this method has reduced the impact of silicon colloidal impurity on product quality, has solved feed grade calcium hydrogen phosphate to phosphate rock The dependence on grade has broadened the utilization range and value of low-grade phosphate rock resources. 2) The method is simple and convenient, does not increase the production cost, and is favorable for industrial promotion.

Description

technical field [0001] The invention relates to a production method of feed-grade calcium hydrogen phosphate, in particular to a method for producing feed-grade calcium hydrogen phosphate by using low-grade phosphate rock as raw material. Background technique [0002] Feed-grade calcium hydrogen phosphate refers to calcium hydrogen phosphate that meets relevant standards and can be used as a supplement for phosphorus and calcium in feed processing. Because the phosphorus-calcium ratio is the closest to that in animal bones, and 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. It can accelerate the growth and development of livestock and poultry, shorten the fattening period, and increase weight rapidly; it can increase the mating rate and survival rate of livestock and poultry, and at the same time, it can enhance the ability of livestock and poultry to resist co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32
CPCC01B25/324C01P2004/61
Inventor 唐文军周晓葵文军孙杰杨军胡正超陈翔
Owner SICHUAN LOMON PHOSPHORUS CHEM
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