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Preparation method of ammonium phosphate anti-caking

An ammonium phosphate and anti-caking technology, which is applied in the field of phosphate fertilizers, can solve the problems of ammonium phosphate fertilizers caking and other problems, and achieve the effects of improving the viscosity of slurry, facilitating growth, and improving anti-caking effects

Active Publication Date: 2012-10-03
WENGFU (GRP) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for anti-caking of ammonium phosphate, to solve the problem of caking of ammonium phosphate fertilizers, while reducing the pollution of pyrite slag to the environment

Method used

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  • Preparation method of ammonium phosphate anti-caking
  • Preparation method of ammonium phosphate anti-caking

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Embodiment

[0013] The present invention has been applied in the Wengfu Phosphate Fertilizer Plant of Wengfu (Group) Co., Ltd., where the pyrite slag produced by the 800,000-ton / year pyrite acid plant is used in the 360,000-ton / year monoammonium phosphate plant , the effect is good.

[0014] Based on the analysis data of pyrite slag on October 20, 2009, it is as follows:

[0015]

[0016] First, the pyrite slag is ground into a fine powder with a particle size of 0.01 mm to 1.0 mm, and then in the ammonium phosphate production device, the slag fine powder is added to the raw material for ammonium phosphate production in a proportion of 10%—the mass fraction is 25 % in the dilute phosphoric acid storage tank, the addition amount is controlled at 5t / h, and the amount of phosphoric acid is 50m 3 / h to improve the viscosity of the slurry; stir continuously with a stirrer in the storage tank, mix evenly and transport it to the neutralization reactor with a pump, the reaction between phosph...

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Abstract

The invention relates to a preparation method of ammonium phosphate anti-caking, which adopts cinder generated in the process of producing sulfuric acid by pyrite ore as an anti-caking agent and comprises the following steps of: firstly, grinding pyrite ore cinder into fine powder; then adding the fine cinder powder to a storage tank of dilute phosphoric acid which is the raw material for producing ammonium phosphate to improve the viscosity of a slurry; evenly stirring by a stirrer in the storage tank; then conveying to a neutral reactor by a pump, and reacting phosphoric acid with ammonium in the reactor; and finally, concentrating and drying the neutral slurry by using a conventional technology to prepare a qualified ammonium phosphate product which is not caked basically. The content of Fe3O4 in the pyrite ore cinder is 45-52 percent, and the ratio of the pyrite ore cinder added to the dilute phosphoric acid is controlled at 3-10 percent. The method has the advantages of: (1) improving the viscosity of the slurry and preventing the ammonium phosphate product from being caked; (2) reducing the pollution of the pyrite ore cinder on the environment and the treating pressure; and (3) improving the structure of applied soil to be beneficial to the growth of crops. The invention is suitable for enterprises of producing the ammonium phosphate products by self-made sulfuric acid.

Description

【Technical field】 [0001] The invention relates to phosphate fertilizer, and also relates to sulfuric acid, in particular, relates to a method for preventing caking of ammonium phosphate fertilizer by using pyrite slag. 【Background technique】 [0002] Ammonium phosphate is one of the main fertilizers in modern agriculture and forestry. Ammonium phosphate usually refers to monoammonium phosphate and diammonium phosphate, referred to as ammonium phosphate. The physical properties of ammonium phosphate produced by different raw materials are quite different: some phosphate rocks can produce high-nutrient ammonium phosphate, and some can only produce low-nutrient ammonium phosphate; some phosphate rocks produce ammonium phosphate products with little caking, The degree of agglomeration of ammonium phosphate produced from some phosphate rocks is more serious. The ammonium phosphate agglomeration is extremely inconvenient to apply. At present, some manufacturers directly add anti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05B11/10C05B7/00
Inventor 黄进陈少平邱祖军张涛饶轶晟张瑞张晓迁陈清宪胡曾毅曾斌游光刚
Owner WENGFU (GRP) CO LTD
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