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Compound fertilizer and method for directly producing same from fertilizer grade dicalcium phosphate

A compound fertilizer and production method technology, which is applied in the direction of urea compound fertilizer, inorganic fertilizer, fertilizer mixture, etc., can solve the problems of low phosphorus yield, high production cost, no fertilizer effect, etc., achieve low equipment corrosion, shorten production cycle, The effect of short reaction times

Inactive Publication Date: 2017-12-22
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the problems in the feed phosphate industry are small production scale, high production cost, many by-products, low phosphorus yield, unadvanced technical and economic indicators, unstable product quality, and low pass rate, etc., which affect the production and sales of enterprises. and further development
White manure itself can be used as phosphate fertilizer, but most of the northern part of my country is saline-alkali land. The application of white manure not only has no fertilizer effect, but also makes the soil agglomerate. White manure can only be applied in a few acidic soils in the south, and its application is greatly restricted. As a result, a large amount of white manure is accumulated, resulting in a serious waste of phosphorus resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Embodiment 1: directly produce compound fertilizer by white manure

[0065] The implementation steps of this embodiment are as follows:

[0066] A. Pretreatment

[0067] Drying the white fertilizer at a temperature of 100° C. for 1.5 hours to obtain white fertilizer powder with a water content of 1.0% by weight, and sieving to obtain white fertilizer powder with a particle size of 0.13 mm;

[0068] B. Preparation of white fertilizer acid hydrolyzate

[0069] Take 50 parts by weight of the white fertilizer powder obtained in step A and 18 parts by weight of sulfuric acid with a concentration of 98% by weight in a grinding mixer, stir and grind for 25 minutes to obtain a white fertilizer acid hydrolyzate;

[0070] C. Preparation of compound fertilizer slurry

[0071] Add monoammonium phosphate, urea, potassium sulfate or potassium chloride to the white fertilizer acid hydrolyzate obtained in step B, and the weight ratio of the total amount of fertilizer added to the wh...

Embodiment 2

[0075] Embodiment 2: directly produce compound fertilizer by white manure

[0076] The implementation steps of this embodiment are as follows:

[0077] A. Pretreatment

[0078] Drying the white fertilizer at a temperature of 80° C. for 2.4 hours to obtain white fertilizer powder with a water content of 0.6% by weight, and sieving to obtain white fertilizer powder with a particle size of 0.20 mm;

[0079] B. Preparation of white fertilizer acid hydrolyzate

[0080] Take 50 parts by weight of the white fertilizer powder obtained in step A and 15 parts by weight of sulfuric acid with a concentration of 98% by weight in a grinding mixer, stir and grind for 5 minutes to obtain a white fertilizer acid hydrolyzate;

[0081] C. Preparation of compound fertilizer slurry

[0082] Add monoammonium phosphate, urea, potassium sulfate or potassium chloride to the white fertilizer acid hydrolyzate obtained in step B, and the weight ratio of the total amount of fertilizer added to the whit...

Embodiment 3

[0086] Embodiment 3: directly produce compound fertilizer by white manure

[0087] The implementation steps of this embodiment are as follows:

[0088] A. Pretreatment

[0089] Drying the white fertilizer at a temperature of 120° C. for 1.8 hours to obtain white fertilizer powder with a water content of 0.7% by weight, and sieving to obtain white fertilizer powder with a particle size of 0.58 mm;

[0090] B. Preparation of white fertilizer acid hydrolyzate

[0091] Take 50 parts by weight of the white fertilizer powder obtained in step A and 24 parts by weight of sulfuric acid with a concentration of 98% by weight in a grinding mixer, stir and grind for 10 minutes to obtain a white fertilizer acid hydrolyzate;

[0092] C. Preparation of compound fertilizer slurry

[0093] Add monoammonium phosphate, urea, potassium sulfate or potassium chloride to the white fertilizer acid hydrolyzate obtained in step B, and the weight ratio of the total amount of fertilizer added to the whit...

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Abstract

The invention relates to a compound fertilizer and a method for directly producing the same from fertilizer grade dicalcium phosphate. The method includes steps of carrying out pretreatment; preparing fertilizer grade dicalcium phosphate acid hydrolysis substances; preparing compound fertilizer slurry; treating the compound fertilizer slurry and the like. The compound fertilizer and the method have the advantages that the method is little in introduced moisture, short in reaction time, low in energy consumption and free of waste gas, wastewater and solid waste emission, the production cycle can be shortened, equipment is low in corrosion, reduction, harmless, reusing and recycling comprehensive utilization principles can be completely implemented, and the compound fertilizer with three nutrients including nitrogen, phosphorus and potassium can be produced by the aid of the method.

Description

【Technical field】 [0001] The invention belongs to the technical field of fertilizer production. More specifically, the present invention relates to a method for directly producing compound fertilizer from white manure, and also relates to said compound fertilizer. 【Background technique】 [0002] As a non-renewable resource, phosphorus resource is the basis for ensuring national food safety production. The world's phosphorus resources tend to be depleted after long-term mining, and high-grade phosphate rocks are gradually decreasing. Fertilizer-grade calcium hydrogen phosphate (commonly known as white fertilizer) is a by-product of wet-process phosphoric acid two-stage or three-stage neutralization method to produce feed-grade calcium hydrogen phosphate. The wet-process phosphoric acid is diluted with the second-stage neutralization mother liquor and then sent to the pre-neutralization tank for a one-stage neutralization reaction with the added lime milk or limestone slurry...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
CPCC05B7/00C05G3/00C05C9/00C05D1/02C05D9/00
Inventor 汤建伟化全县刘咏王保明姜高亮刘丽赵四方任孟伟
Owner ZHENGZHOU UNIV