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Method for producing ammonium sulphate grain products by using inorganic caking agent

An inorganic binder and ammonium sulfate technology, applied in the fields of application, ammonium salt fertilizer, nitrogen fertilizer, etc., can solve the problems of unable to produce granular ammonium sulfate, and achieve the effects of improving product market competitiveness, easy operation, and uniform particle size

Active Publication Date: 2009-11-11
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

No. 00104473.7 filed by Ningxia Zhang Mingan disclosed a method for a small nitrogen fertilizer factory to use gypsum as raw material to produce ammonium sulfate and carbonate gas fertilizer. It mentioned that calcium carbonate containing ammonium sulfate was directly dried and compounded with a binder to produce carbon dioxide gas. fertilizer, but this method cannot be used for granular ammonium sulfate production
There is no report on the use of organic binders in the production of granular ammonium sulfate

Method used

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  • Method for producing ammonium sulphate grain products by using inorganic caking agent
  • Method for producing ammonium sulphate grain products by using inorganic caking agent

Examples

Experimental program
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Effect test

example 1

[0019] Example 1 single inorganic binder produces granular ammonium sulfate

[0020] Use diammonium phosphate as the inorganic binder, crush it to 20-200 meshes for later use; use ≤2mm ammonium sulfate crystals (the active ingredients are N: 20.4%, S: 23.58%, H 2 O: 0.8%) is crushed to 20-200 mesh by a pulverizer; mixed according to the ratio of diammonium phosphate and ammonium sulfate is 5:95, enters the granulator, and granulates through medium-pressure steam spraying, and the granulation temperature is 120 ℃~160℃; drying by two-stage dryer, the first stage drying temperature is 220℃~280℃, the second stage drying temperature is 180℃~240℃; after cooling, sieve with a sieving machine, and the selected particle size is 1~5mm The granules are ammonium sulfate products, which pass the inspection and are packaged for delivery.

example 2

[0021] The mixed inorganic binder of example 2 produces granular ammonium sulfate

[0022] The steps are the same as in Example 1, select monoammonium phosphate and magnesium sulfate monohydrate to be mixed according to 1:1 as the inorganic binder and pulverize to 20-200 mesh for later use; mix according to the ratio of the inorganic binder and ammonium sulfate as 3:97, After mixing, put it into the granulator together, control the ratio and process operation parameters, and make qualified granular ammonium sulfate products.

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Abstract

The invention discloses a method for producing ammonium sulphate grain products by using an inorganic caking agent, which comprises the steps of: (1) selecting one of diammonium phosphate or monoammonium phosphate, or the mixture of diammonium phosphate or monoammonium phosphate and magnesium sulfate monohydrate or magnesium sulfate heptahydrate as the inorganic caking agent for producing ammonium sulphate grains, and crushing the inorganic caking agent for standby; (2) crashing the ammonium sulphate crystals; (3) uniformly mixing the crashed ammonium sulphate crystals and the crashed inorganic caking agent according to the proportion between the inorganic caking agent and the ammonium sulphate, adding the mixture into a pelletizer for pelleting with middle pressure and steam to obtain the semi-finished products; (4) drying the semi-finished products; and (5) screening the dried finished products, and packaging the products which are inspected to be qualified. The method for producing ammonium sulphate grain products by using the inorganic caking agent has the advantages that: (1) the technique is simple and the operation is convenient; (2) the caking agent is easy to be obtained and the weight percentage of the product nutrition is above 90 percent, the granularity is uniform and the strength is suitable for large mechanized operation; and (3) the organic caking agent is free to be mixed according to the granulating requirement, and can meet large mechanized production. The method of producing ammonium sulphate grain products by using the inorganic caking agent is suitable to be popularized and used in producing compound fertilizers.

Description

technical field [0001] The present invention relates to chemical fertilizer products, further to the production of ammonium sulfate, in particular to a method for producing granular ammonium sulfate with an inorganic binder. Background technique [0002] With the development of market economy, the development of large-scale agricultural mechanization is getting faster and faster. In recent years, granular fertilizers have been favored by customers, and their prices are much higher than traditional forms of fertilizers. As the earliest nitrogen fertilizer ammonium sulfate on the market, the current crystal form cannot meet the requirements of agricultural mechanized fertilization. [0003] Among existing Chinese patent applications, No. CN1051711 of Japanese application discloses a kind of preparation method of large granular ammonium sulfate, but fails to be popularized vigorously; No. CN88102293A of Dutch application discloses granulation in particle fluidized bed to produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05C3/00C05G1/06
Inventor 王邵东李红林王飞禹志宏杨喆
Owner WENGFU (GRP) CO LTD
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