Ammonium polyphosphate granular multi-component compound fertilizer with low polymerization degree and preparation method thereof

A technology of ammonium polyphosphate and low degree of polymerization, applied in ammonium orthophosphate fertilizer, urea compound fertilizer, alkaline orthophosphate fertilizer, etc., can solve the problems of high energy consumption, high production cost, increased production cost, etc. The effect of high difficulty in control, high production cost, and not easy to agglomerate

Inactive Publication Date: 2021-06-18
新乡市威远化工新技术有限公司
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Problems solved by technology

[0006] In view of the above-mentioned technical deficiencies, one of the purposes of the present invention is to provide a method for preparing low-polymerization ammonium polyphosphate and low-polymerization ammonium polyphosphate granular multivariate compound fertilizers, aiming to solve the raw material loss of ammonium polyphosphate prepared by existing methods High, serious tail gas pollution, high energy consumption, difficult process control, high production cost, easy moisture absorption and other problems
[0007] The second object of the present invention is to provide a viscous solution of acidic ammonium polyphosphate, which can be used as granulation adhesive, material conditioner and metal ion chelating agent for traditional dr

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  • Ammonium polyphosphate granular multi-component compound fertilizer with low polymerization degree and preparation method thereof
  • Ammonium polyphosphate granular multi-component compound fertilizer with low polymerization degree and preparation method thereof

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preparation example Construction

[0071] like figure 2 As shown, another preparation method comprises the following steps:

[0072] S1. Preparation of acidic ammonium polyphosphate viscous solution: Add the raw materials for preparing the acidic ammonium polyphosphate viscous solution in the formula amount into the reactor, stir and react in the reactor to form an acidic ammonium polyphosphate viscous solution, and transport it to the intermediate storage tank with stirring for waiting use;

[0073] S2. Preparation of low-polymerization-degree ammonium polyphosphate granule multivariate compound fertilizer: transport the acidic ammonium polyphosphate viscous solution into the drum granulator, and spray it on the inner material layer of the drum granulator through an atomizing nozzle. The mass ratio of acidic ammonium polyphosphate viscous solution to solid raw materials, system return material, ammonium bicarbonate polymerization granulation, and steam is added to the material layer of the granulator to adju...

Embodiment 1

[0076] A kind of low polymerization degree ammonium polyphosphate granular zinc-containing multiple compound fertilizer, comprising solid monoammonium phosphate (11-44-0) 80kg / t, solid urea (46.4-0-0) 265kg / t, solid ammonium chloride (25.4 -0-0) 400kg / t, solid potassium chloride (0-0-60) 100kg / t, acidic ammonium polyphosphate viscous solution 182kg / t, gas ammonia 17kg / t. The mass ratio of solid raw material, acidic solution, and gas ammonia is 4.64:1.0:0.09, and the mass ratio of acidic ammonium polyphosphate viscous solution to gas ammonia added to the tubular reactor is 1.0:0.05.

[0077] The preparation method of the low-polymerization-degree ammonium polyphosphate particle zinc-containing multivariate compound fertilizer comprises the following steps:

[0078] S1. Prepare an acidic ammonium polyphosphate viscous solution, stir and react according to the mass ratio of concentrated sulfuric acid, monoammonium phosphate, water, urea, and zinc sulfate as 1.0:2.0:1.0:2.0:0.07, ...

Embodiment 2

[0082] A low-polymerization degree ammonium polyphosphate granule multivariate compound fertilizer, comprising solid monoammonium phosphate (11-47-0) 235kg / t, solid ammonium chloride (25.4-0-0) 360kg / t, solid potassium chloride (0 -0-60) 250kg / t, acidic ammonium polyphosphate solution (concentrated sulfuric acid, monoammonium phosphate, water mass ratio 1.0:2.0:2.0) 225kg / t, ammonia gas 31kg / t. The mass ratio of solid raw material, acidic solution, and ammonia gas is 3.75:1.0:0.14, and the mass ratio of acidic ammonium polyphosphate viscous solution to ammonia gas added to the tubular reactor is 1.0:0.08.

[0083] The preparation method of the low-polymerization-degree ammonium polyphosphate granule multivariate compound fertilizer comprises the following steps:

[0084] S1. Prepare an acidic ammonium polyphosphate viscous solution, stir and react according to the mass ratio of concentrated sulfuric acid, monoammonium phosphate, and water at a ratio of 1.0; use.

[0085] S2....

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Abstract

The invention discloses an ammonium polyphosphate granular multi-component compound fertilizer with a low polymerization degree and a preparation method thereof. The compound fertilizer is prepared from the following raw materials: a solid raw material, an acidic ammonium polyphosphate viscous solution and an ammoniating agent in a mass ratio of (4.0-8.0): 1.0: (0.05-1.0). The preparation method of the ammonium polyphosphate granular multi-component compound fertilizer with the low polymerization degree comprises a rotary-drum ammonia ammoniation granulation method under the working condition of an ammonia station and a rotary drum ammonium bicarbonate ammoniation granulation method under the working condition of a non-ammonia station. The preparation method in the invention solves the problems of high raw material consumption, high energy consumption, high environmental pollution, high cost and easy moisture absorption of products in the existing method for synthesizing ammonium polyphosphate, and also solves the problems of low pelletizing rate, low product particle strength, poor product water solubility, easy caking of products, low phosphate fertilizer utilization rate of the products and the like in the existing method for preparing the compound fertilizer by rotary drum granulation.

Description

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Claims

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Application Information

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Owner 新乡市威远化工新技术有限公司
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