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Method for producing industrial monoammonium phosphate through fluoride salt purification method

A technology of monoammonium phosphate and fluoride, which is applied in chemical instruments and methods, phosphate, phosphorus oxyacids, etc., can solve problems such as high cost of modifiers, affecting product quality, and ineffective use of waste residues, etc., to achieve product Low cost, improved purity and water solubility, less impurities

Active Publication Date: 2016-05-25
KINGENTA NORSTERRA CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention aims at the high impurity content of fluorine, calcium, iron, magnesium and aluminum in wet-process phosphoric acid in the existing technological process, which is difficult to remove completely in the production process of monoammonium phosphate, which affects the product quality; the waste residue in the production process cannot be effectively utilized, and external To solve the problem of high cost of modifiers, the fluoride salt obtained by further processing the raw materials after defluorination of phosphoric acid is used as an impurity remover to provide a new, efficient, low-cost, and relatively thorough impurity removal method to produce high-quality industrial monoammonium phosphate

Method used

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  • Method for producing industrial monoammonium phosphate through fluoride salt purification method

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Experimental program
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Effect test

Embodiment 1

[0038] A method for producing monoammonium phosphate by a fluoride salt purification process, comprising the steps of:

[0039] (1) Take 1000 kg of wet-process phosphoric acid, first add 40 kg of phosphate rock powder, stir at 60°C for 1 hour, and separate liquid and solid to obtain 34 kg of desulfurized phosphoric acid and phosphogypsum.

[0040](2) Add 14.84 kg of sodium carbonate to the desulfurized phosphoric acid and react for 2 hours to separate the liquid from the solid to obtain 968.5 kg of desulfurized defluorophosphoric acid and 15.84 kg of sodium fluorosilicate. The obtained phosphoric acid analysis results are as follows, all in mass percent.

[0041] P 2 o 5 %24.53; MgO%1.4811; Al 2 o 3 %0.5119; CaO%0.2295; Fe 2 o 3 %0.1268; SO 4 2－ %0.79, SiO 2 %0.0257;F - %0.52;

[0042] (3) Add 58 kg of 20% aqueous ammonia to the sodium fluorosilicate prepared in step (2), and react at 40° C. for 1 hour to obtain 40 kg of fluoride salt scavenger and 5 kg of silicon d...

Embodiment 2

[0046] As described in Example 1, the difference is:

[0047] In step (4): Into the desulfurized and defluorinated phosphoric acid prepared in step (2), pass through ammonia gas to neutralize until the pH is stabilized at 2.5-3.0, then add the fluoride salt prepared in step (3) to neutralize to pH = 3.8, 785 kg of liquid was obtained by liquid-solid separation, and the analyzed components are as follows, all in mass percent.

[0048] P 2 o 5 %22.72; MgO%0.4105; Al 2 o 3 %0.0052; CaO%0.0611; Fe 2 o 3 %0.028; SO 4 2－ %0.80; SiO 2 %0.1021;

[0049] In step (5): get 100 kilograms of monoammonium solution of step (4) and add 0.5% complexing agent to concentrate to a concentration of about 40%, crystallize at 30 DEG C after 4 hours of liquid-solid separation, and obtain 21.80 kilograms of industrial monoammonium phosphate The liquid is evaporated and dried to obtain 18.21 kilograms of water-soluble fertilizers. The nutrients of industrial monoammonium phosphate are: N% 11...

Embodiment 3

[0051] As described in Example 1, the difference is:

[0052] In step (4): Into the desulfurized and defluorinated phosphoric acid prepared in step (2), pass through ammonia gas to neutralize until the pH is stabilized at 2.5-3.0, then add the fluoride salt prepared in step (3) to neutralize to pH=3.4, 796 kg of liquid was obtained by liquid-solid separation, and the analyzed components are as follows, all in mass percentage.

[0053] P 2 o 5 %22.83; MgO%0.5061; Al 2 o 3 %0.0112; CaO%0.0865; Fe 2 o 3 %0.032; SO 4 2－ %0.82; SiO 2 %0.1002;

[0054] In step (5): get 100 kilograms of step (4) monoammonium solution and add 0.5% complexing agent to concentrate to a concentration of about 40%, crystallize at 40 DEG C for 3 hours after liquid-solid separation, and obtain 22.16 kilograms of industrial monoammonium phosphate ; The liquid is evaporated and dried to obtain 18.08 kilograms of water-soluble fertilizers. The nutrients of industrial monoammonium phosphate are: N% 1...

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Abstract

The invention relates to a method for producing industrial monoammonium phosphate through a fluoride salt purification method. Wet process phosphoric acid is used as a raw material, powdered rock phosphate is added for desulfuration, sodium carbonate is added for defluorination, sodium fluosilicate prepared in the defluorination process is added into ammonia water to react, a fluoride salt purifying agent is prepared, after desulfurized and defluorinated phosphoric acid is neutralized with ammonia gas, the prepared fluoride salt purifying agent is added to adjust the pH value, the reaction continues to be conducted after a period of time, filtering is carried out while the mixture is hot to obtain a monoammonium solution, a complexing agent is added to complex microelements, and after complete dissolution, water-soluble monoammonium phosphate is prepared through concentration, crystallization, separation and drying. The fluoride salt purifying agent produced from fluorine in wet process phosphoric acid is used for removing most impurities in monoammonium phosphate slurry, the impurity removal effect is remarkable, and industrial monoammonium phosphate has the advantages of being high in purity, simple in process, low in cost and suitable for industrial large-scale production and has few impurities.

Description

technical field [0001] The invention relates to a method for producing industrial monoammonium phosphate by a fluoride salt purification method, belonging to the technical field of chemical production. Background technique [0002] Industrial monoammonium phosphate has good thermal stability, and can be used as a phosphorus nutrient source for yeast culture, medicine, and one of the main raw materials for water-soluble fertilizers. The wide use of water-soluble fertilizers in agricultural planting and flower garden ornamental industries has greatly promoted The development of my country's water-soluble fertilizer. However, the domestic research on water-soluble fertilizers started late, the standards are not perfect, and the market concentration is low, resulting in uneven product quality in the market. For monoammonium phosphate water-soluble fertilizer, due to the vast territory of our country, the composition of phosphate rock impurities and the content of each component ...

Claims

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Application Information

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IPC IPC(8): C01B25/28C01B33/12C01F11/46
CPCC01B25/28C01B33/12C01F11/46C01F11/466C01P2006/80
Inventor 张敏温义培王娜刘鹏于南树
Owner KINGENTA NORSTERRA CHEM CO LTD
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