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Technology for producing feed-grade potassium dihydrogen phosphate by using phosphoric acid process

A technology of potassium dihydrogen phosphate and production process, which is applied in the direction of phosphorus compounds, chemical instruments and methods, calcium/strontium/barium sulfate, etc., which can solve the problems of high production cost and achieve a safe effect

Inactive Publication Date: 2017-11-03
LUFENG TIANBAO PHOSPHORUS CHEM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Potassium dihydrogen phosphate is a kind of potassium-containing phosphate, which is widely used in industry, agriculture, health, food and other industries. Feed-grade potassium dihydrogen phosphate is used as a feed additive in animal breeding. In recent years, the price is good and the market demand is very high. Large, but the production cost of this product is high

Method used

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  • Technology for producing feed-grade potassium dihydrogen phosphate by using phosphoric acid process

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Experimental program
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Effect test

Embodiment 1

[0015] Step A pulp production: crush the phosphate rock in a crusher, and make pulp through a ball mill to obtain a phosphate rock pulp;

[0016] Step B sulfuric acid acid hydrolysis reaction: Add sulfuric acid to the phosphate rock slurry in the extraction tank, filter through a filter after sufficient reaction to obtain phosphogypsum and filtrate, discharge the filtrate into the phosphoric acid sedimentation tank, and add a certain amount of coagulation Precipitating agent, obtain phosphoric acid solution 1;

[0017] Step C, one-stage neutralization: put the phosphoric acid solution 1 into the reaction tank, and add calcium hydroxide solution, fully react until the pH value of the solution is 1.1, then add sodium sulfide to remove arsenic, after the reaction is completed, centrifuge the thick slurry to obtain white Fertilizer, the upper layer solution is discharged into a section of clarification tank, and solution 1 is obtained after precipitation;

[0018] Step D, second ...

Embodiment 2

[0024] Step A pulp production: crush the phosphate rock in a crusher, and make pulp through a ball mill to obtain a phosphate rock pulp;

[0025] Step B sulfuric acid acid hydrolysis reaction: Add sulfuric acid to the phosphate rock slurry in the extraction tank, filter through a filter after sufficient reaction to obtain phosphogypsum and filtrate, discharge the filtrate into the phosphoric acid sedimentation tank, and add a certain amount of coagulation Precipitating agent, obtain phosphoric acid solution 1;

[0026] Step C, one-stage neutralization: put the phosphoric acid solution 1 into the reaction tank, add calcium hydroxide solution, and react fully until the pH value of the solution is 1.2, then add sodium sulfide to remove arsenic, and centrifuge the thick slurry to obtain white Fertilizer, the upper layer solution is discharged into a section of clarification tank, and solution 1 is obtained after precipitation;

[0027] Step D, second stage neutralization: add cal...

Embodiment 3

[0033] Step A pulp production: crush the phosphate rock in a crusher, and make pulp through a ball mill to obtain a phosphate rock pulp;

[0034] Step B sulfuric acid acid hydrolysis reaction: Add sulfuric acid to the phosphate rock slurry in the extraction tank, filter through a filter after sufficient reaction to obtain phosphogypsum and filtrate, discharge the filtrate into the phosphoric acid sedimentation tank, and add a certain amount of coagulation Precipitating agent, obtain phosphoric acid solution 1;

[0035] Step C, one-stage neutralization: put the phosphoric acid solution 1 into the reaction tank, add calcium hydroxide solution, and react fully until the pH value of the solution is 1.4, then add sodium sulfide to remove arsenic, and centrifuge the thick slurry to obtain white Fertilizer, the upper layer solution is discharged into a section of clarification tank, and solution 1 is obtained after precipitation;

[0036] Step D, second stage neutralization: add cal...

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Abstract

The invention discloses a technology for producing feed-grade potassium dihydrogen phosphate by using a phosphoric acid process. The technology is characterized by comprising the following steps: making ore pulp, carrying out a sulfuric acid acidolysis reaction, carrying out first-stage neutralization, carrying out second-stage neutralization, carrying out third-stage neutralization, carrying out concentrated phosphoric acid regeneration, neutralizing to generate potassium dihydrogen phosphate, and crystallizing the obtained potassium dihydrogen phosphate. The technology provided by the invention only adds three steps on the basis of production of calcium hydrogen phosphate, thus achieving low technological cost, flexible production and simple technology; environmental pollutants such as wastewater are not discharged in the whole process, and by-products of the technology are high in utilization value.

Description

technical field [0001] The invention belongs to a process for producing feed-grade potassium dihydrogen phosphate, and in particular relates to a production process for producing feed-grade potassium dihydrogen phosphate by a phosphoric acid method. Background technique [0002] Potassium dihydrogen phosphate is a kind of potassium-containing phosphate, which is widely used in industry, agriculture, health, food and other industries. Feed-grade potassium dihydrogen phosphate is used as a feed additive in animal breeding. In recent years, the price is good and the market demand is very high. Large, but the production cost of this product is high. my country is rich in phosphate rock resources. If potassium dihydrogen phosphate can be produced from phosphate rock, the cost can be reduced. Now the production methods of potassium dihydrogen phosphate mainly include: neutralization method, extraction method, ion exchange method, double decomposition method, electrolysis method, d...

Claims

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Application Information

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IPC IPC(8): C01B25/30C01B25/32C01F11/46
CPCC01B25/301C01B25/322C01F11/46
Inventor 粟宇周荣超周荣敏彭启明
Owner LUFENG TIANBAO PHOSPHORUS CHEM CO LTD
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