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Method for producing agricultural potassium metaphosphate

A technology of potassium metaphosphate and its production method, which is applied in phosphate fertilizer, application, agriculture, etc., can solve the problems of no patent application, etc., and achieve the effects of no waste discharge, easy treatment, good economic benefits and environmental protection benefits

Inactive Publication Date: 2010-06-02
GUIZHOU RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] So far, there is no patent application related to the production of potassium metaphosphate by-product ammonium chloride using cheap agricultural monoammonium phosphate and agricultural potassium chloride as raw materials

Method used

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  • Method for producing agricultural potassium metaphosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] With N 11.3%, P 2 o 5 45.1% Monoammonium Phosphate and K 2 O 60.6% Potassium Chloride as raw material, mix 120kg powdered monoammonium phosphate and 57kg Potassium Chloride, place in a graphite crucible, heat to 650-750°C and keep it for 2 hours, pour out the melt and cool to room temperature, Crush to ≤1mm to get 113kg potassium metaphosphate product. Pump the gas escaping from the graphite crucible to the settling chamber and cool it to 110°C-180°C to obtain 48kg of ammonium chloride, and the rest of the waste gas is washed with water and then emptied. The product quality is as follows:

[0031] Potassium metaphosphate composition: P 2 o 5 46.8%;K 2 O 30.3%

[0032] Ammonium chloride composition: N 25.3%.

Embodiment 2

[0034] The raw materials used are the same as in Example 1. Mix 120kg of powdered monoammonium phosphate and 65kg of potassium chloride, place in a graphite crucible, heat to 750-800°C and keep it for 1 hour, then pour out the melt, cool it to room temperature, and crush it to 1mm to get 111kg of potassium metaphosphate products. Pump the gas escaping from the graphite crucible to the settling chamber and cool it to 110°C to 180°C to obtain 47.2kg of ammonium chloride, and the rest of the waste gas is washed with water and then emptied. The product quality is as follows:

[0035] Potassium metaphosphate composition: P 2 o 5 47.6%, K 2 O 33.2%;

[0036] Ammonium chloride composition: N 25.1%.

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Abstract

The invention relates to a method for producing agricultural potassium metaphosphate, comprising the following steps: mixing agricultural monoammonium phosphate with potassium chloride, adding the mixture of the agricultural monoammonium phosphate and the potassium chloride to a reactor and heating the reactor to make the agricultural monoammonium phosphate and the potassium chloride react to generate molten potassium metaphosphate, sublimed ammonium chloride and water vapor; discharging the molten potassium metaphosphate, cooling and grinding to obtain the potassium metaphosphate product after the reaction; and cooling and recovering the sublimed ammonium chloride to be used as the agricultural fertilizer. The agricultural monoammonium phosphate accounts for 60-75 percent by weight, and the potassium chloride accounts for 25-40 percent by weight; the mass ratio of the agricultural monoammonium phosphate to the potassium chloride is 100:47-55; the agricultural monoammonium phosphate and the potassium chloride react at 600-900 DEG C are stand for 1-4h; and the reactor is a graphite reactor. The method can be used for producing the agricultural potassium metaphosphate and the ammonium chloride product without discharging the waste material, is easy to control, provides a new way for producing the slow-release potassium-phosphate fertilizer and has better economic and environmental-friendly benefits.

Description

technical field [0001] The present invention relates to phosphorus oxo-salts, and further relates to potassium metaphosphate, specifically, it belongs to the method for producing potassium metaphosphate and ammonium chloride by metathesis of ammonium phosphate and potassium chloride. Background technique [0002] In the prior art, potassium metaphosphate has two kinds of manufacturing methods: [0003] (1) Use thermal process phosphoric acid and potassium chloride as raw materials to manufacture potassium metaphosphate. The method is to mix potassium chloride with thermal process phosphoric acid, heat and react to generate potassium dihydrogen phosphate, and then obtain potassium metaphosphate through high-temperature heating. [0004] The chemical reaction formula is as follows: [0005] 2KCl+2H 3 PO 4 =2KH 2 PO 4 +2HCl [0006] 2KH 2 PO 4 =K 2 h 2 P 2 o 7 +H 2 o [0007] K 2 h 2 P 2 o 7 = KPO 3 +H 2 o [0008] (2) Manufacture of potassium metaphosphate...

Claims

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Application Information

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IPC IPC(8): C05B13/06C01C1/16
Inventor 顾春光
Owner GUIZHOU RES INST OF CHEM IND
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