Production method of controlled-release phosphorus potassium fertilizer

A production method and slow-release technology, which are applied in fertilizer mixtures, fertilization devices, applications, etc., can solve the problems of slow-release phosphorus-potassium fertilizers produced by calcium dihydrogen phosphate, etc., and achieve the effects of low synthesis temperature and energy saving.

Active Publication Date: 2013-09-18
GUIZHOU WUGUHUI ECOLOGICAL AGRI TECHCO
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At present, there are no relevant reports and patent applications for the production of slow-rel

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  • Production method of controlled-release phosphorus potassium fertilizer

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Embodiment Construction

[0014] In order to make it easy to understand the technical means, creative features, work flow, and use methods of the present invention to achieve the purpose and effect, the present invention will be further described below in conjunction with examples.

[0015] Adopt technology potassium sulfate of the present invention and calcium dihydrogen phosphate to produce potassium polymetaphosphate and calcium sulfate melt slow-release fertilizer:

[0016] The first step is potassium sulfate pretreatment. Potassium sulfate is agricultural grade potassium sulfate, which needs to be pretreated. The specific process is: take 100kg of potassium sulfate (K2O content ≥ 60%), grind and pulverize, the particle size reaches 70 mesh, mix and develop independently The auxiliary agent 1kg.

[0017] The second step is to take 75kg of calcium dihydrogen phosphate for pretreatment, which needs to be ground and crushed to 70mu;

[0018] The third step is to mix potassium sulfate and calcium dihy...

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Abstract

The invention discloses a production method of a controlled-release phosphorus potassium fertilizer. The method comprises the following steps: (1) pretreating 100 parts of potassium sulfate, wherein potassium sulfate is agricultural potassium sulfate and needs to be pretreated, grinding and crushing the potassium sulfate, and mixing the crushed potassium sulfate with 1 part of self prepared addition agent; (2) pretreating 75 parts of monocalcium phosphate, and grinding and crushing the monocalcium phosphate; (3) mixing the potassium sulfate with the monocalcium phosphate, and then, extruding a mixture to granulates; (4) preheating at 90-120 DEG C; and (5) transferring to a special reactor to react so as to obtain potassium metaphosphate. Compared with the prior art, the method is low in synthesizing temperature and energy-saving, and cannot corrode equipment in a reaction process.

Description

technical field [0001] The invention relates to the production of a fertilizer, in particular to a method for producing potassium metaphosphate and calcium sulfate melt slow-release fertilizer by using potassium sulfate and calcium dihydrogen phosphate. Background technique [0002] Potassium metaphosphate is a kind of good chemical fertilizer, and this is due to: the effective nutrient composition of plant (theoretical content K2O mass fraction is about 38%, P2O5 mass fraction is about 58%) with concentration up to 96%; No chlorine and phytotoxicity Low rate, safe and deep application, timely direct contact with seeds will not cause damage to germs; especially suitable for crops that avoid chlorine, such as tomato, potato, tobacco and other economic crops; high concentration, stable chemical properties, non-absorbent , It is convenient for storage and transportation, and the packaging material does not need special treatment, and it can be mixed with uric acid, ammonium nit...

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Application Information

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IPC IPC(8): C05G1/00
Inventor 虞江
Owner GUIZHOU WUGUHUI ECOLOGICAL AGRI TECHCO
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