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Method for producing potassium dihydrogen phosphate through wet-process phosphoric acid

A technology of potassium dihydrogen phosphate and wet-process phosphoric acid, which is applied to chemical instruments and methods, phosphate fertilizers, and phosphorus compounds. It can solve the problems of high energy consumption and high corrosion of equipment, and achieve reduced corrosion, energy consumption, and raw material utilization. full effect

Active Publication Date: 2013-05-01
河南豫邮金大地科技服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The disadvantage of the above-mentioned technology is that although the reaction time is finally shortened to 3-8 seconds, the reaction temperature is 170-280°C, the energy consumption is large, and the equipment is very corrosive, and the absorption device for hydrochloric acid has a high absorption speed. There are higher requirements in terms of corrosion resistance

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  • Method for producing potassium dihydrogen phosphate through wet-process phosphoric acid
  • Method for producing potassium dihydrogen phosphate through wet-process phosphoric acid
  • Method for producing potassium dihydrogen phosphate through wet-process phosphoric acid

Examples

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Embodiment 1

[0044] A method for producing potassium dihydrogen phosphate by wet-process phosphoric acid, comprising the steps of:

[0045] (1) Add phosphate rock powder to wet-process phosphoric acid, according to the Ca element in phosphate rock powder and SO in concentrated wet-process phosphoric acid3 Add phosphate rock powder at a molar ratio of 1.4:1, react at a temperature of 60°C for 2 hours, separate solid and liquid, and take the filtrate to obtain desulfurized phosphoric acid;

[0046] After solid-liquid separation, the filter residue is phosphogypsum, which can be used as compound fertilizer filler;

[0047] After testing, the composition of dethiophosphoric acid is as follows, all in percent by weight: P 2 o 5 21.61%; F1.16%; SO 3 0.38%; CaO0.37%; MgO0.43%; Fe 2 o 3 0.029%;Al 2 o 3 0.002%; SiO 2 0.002%, the balance of water and other impurities;

[0048] (2) Concentrate desulfurized phosphoric acid to contain P 2 o 5 46wt%, add potassium chloride according to the mol...

Embodiment 2

[0055] A method for producing potassium dihydrogen phosphate by wet-process phosphoric acid, comprising the steps of:

[0056] (1) Add phosphate rock powder to wet-process phosphoric acid, according to the Ca element in phosphate rock powder and SO in concentrated wet-process phosphoric acid 3 Add phosphate rock powder at a molar ratio of 1.2:1, react at a temperature of 40°C for 3 hours, separate solid and liquid, and take the filtrate to obtain desulfurized phosphoric acid;

[0057] After solid-liquid separation, the filter residue is phosphogypsum, which can be used as compound fertilizer filler;

[0058] After testing, the composition of dethiophosphoric acid is as follows, all in percent by weight: P 2 o 5 19.10%; F1.04%; SO 3 1.18%; CaO0.22%; MgO0.38%; Fe 2 o 3 0.023%;Al 2 o 3 0.002%; SiO 2 0.002%, the balance of water and other impurities;

[0059] (2) Concentrate wet-process phosphoric acid to contain P 2 o 5 56wt%, according to the molar ratio of phosphorus...

Embodiment 3

[0066] A method for producing potassium dihydrogen phosphate by wet-process phosphoric acid, comprising the steps of:

[0067] (1) Add phosphate rock powder to wet-process phosphoric acid, according to the Ca element in phosphate rock powder and SO in concentrated wet-process phosphoric acid 3 Add phosphate rock powder at a molar ratio of 1.6:1, react at a temperature of 70°C for 1.5 hours, separate solid and liquid, and take the filtrate to obtain desulfurized phosphoric acid;

[0068] After solid-liquid separation, the filter residue is phosphogypsum, which can be used as compound fertilizer filler;

[0069] After testing, the composition of dethiophosphoric acid is as follows, all in percent by weight: P 2 o 5 23.11%; F1.41%; SO 3 0.12%; CaO0.45%; MgO0.53%; Fe 2 o 3 0.041%;Al 2 o 3 0.007%; SiO 2 0.004%, the balance of water and other impurities;

[0070] (2) Concentrate wet-process phosphoric acid to contain P 2 o 5 50wt%, add potassium chloride according to the ...

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Abstract

The invention relates to a method for producing potassium dihydrogen phosphate through wet-process phosphoric acid, which comprises the following steps: (1) putting phosphate rock powder into wet-process phosphoric acid, solid-liquid separating after reaction, gathering the filtrate, and obtaining desulfuration phosphate; (2) after concentrating the desulfuration phosphate, adding potassium chloride, preparing mixed solution and obtaining a mixture after reaction; (3) adding a pH regulator into the mixture to adjust the pH value, performing solid-liquid separation, and gathering the filtrate; (4) adding phosphate into the filtrate, and adjusting the pH value to obtain the mixture solution; and (5) after cooling and crystallizing the mixture solution, performing solid-liquid separation, gathering crystals, drying and obtaining potassium dihydrogen phosphate. According to the invention, the highest reaction temperature of the method is only 100 DEG C, the corrosivity and energy consumption towards the equipment are decreased; the cost is much lower than the production cost in the prior art which uses heat process phosphoric acid to produce potassium dihydrogen phosphate; and the product purity is high, the raw material is fully used, and the method is environmental-friendly and has better social benefits and economic benefits.

Description

technical field [0001] The invention relates to a method for producing potassium dihydrogen phosphate with wet-process phosphoric acid, belonging to the technical field of high-concentration fertilizer production. Background technique [0002] Potassium dihydrogen phosphate (KH 2 PO 4 ) as a high-efficiency phosphorus and potassium compound fertilizer is widely used in almost all crops such as grain, melons, fruits, and vegetables. It can increase production and income, improve the quality of agricultural products, resist lodging, and resist dry and hot winds. Its industrial-grade product is also a fully water-soluble fertilizer. Therefore, potassium dihydrogen phosphate has been developed rapidly and widely used in recent years. [0003] The current industrial production methods mainly include neutralization method, extraction method and ion exchange method. The neutralization method is prepared by the neutralization reaction of thermal phosphoric acid and potassium alk...

Claims

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Application Information

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IPC IPC(8): C01B25/30C01B7/03C05B5/00
Inventor 郑树林李新柱张敏胡兆平刘鹏王伯通邹士龙于南树
Owner 河南豫邮金大地科技服务有限公司
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