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Granulating method for monohydrate magnesium sulfate

A magnesium sulfate and granulation technology, applied in directions such as magnesium sulfate, can solve the problems of affecting the main content of granulated products, pollute the environment, waste resources, etc., and achieve the effects of low cost, smooth particles and convenient operation.

Inactive Publication Date: 2008-05-28
NAFINE CHEMICAL INDUSTRY GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the magnesium sulfate monohydrate used in the fertilizer industry is in powder form. When used or mixed with other fertilizers, the dust is large, which wastes resources and pollutes the environment.
At present, there is no report on the granulation of magnesium sulfate monohydrate, and some non-fertilizers such as attapulgite are used as binders in the granulation of the fertilizer industry, which affects the main content of the granulated products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Pour the magnesium sulfate monohydrate powder containing 26.5% MgO into the granulation area of ​​the disc granulator, and slowly add 10wt% MgSO 4 The solution (accounting for about 30% of the powder amount) is used as a binder for granulation, sieved with a 1mm and 6mm two-layer screen, and the 1mm~6mm particles are put into the vibrating fluidized drying bed, and the air inlet temperature is 300℃~ 400°C, the outlet air temperature is 110°C~120°C, and the products that come out are screened with 1mm and 5mm two-layer sieves, and the Ф1mm~Ф5mm particles are packaged to obtain granular magnesium sulfate monohydrate. The small pellets obtained by the two screenings are returned to the disc granulator for re-granulation, and the large pellets are crushed and then returned to the disc granulator for re-granulation. The product inspection results are:

[0014] MgO: 25.5%

[0015] Hardness: 16N / cm 2

[0016] Particle size: Ф1mm~Ф5mm.

Embodiment 2

[0018] Pour the magnesium sulfate monohydrate powder containing MgO 26.6% into the granulation area of ​​the disc granulator, and slowly add 15wt% MgSO 4 The solution (accounting for about 30% of the powder amount) is used as a binding agent to granulate, and all the other procedures are the same as in Example 1 to obtain granule magnesium sulfate monohydrate. The product inspection results are:

[0019] MgO: 25.7%

[0020] Hardness: 19N / cm 2

[0021] Particle size: Ф1mm~Ф5mm.

Embodiment 3

[0023] Pour the magnesium sulfate monohydrate powder containing 26.8% MgO into the granulation area of ​​the disc granulator, and slowly add 20wt% MgSO 4 Solution (accounting for about 30% of powder amount) is used as binding agent to granulate, and all the other procedures are with embodiment 1, and granular magnesium sulfate monohydrate is obtained according to example 1. The product inspection results are:

[0024] MgO: 26.2%

[0025] Hardness: 28N / cm 2

[0026] Particle size: Ф1mm~Ф5mm.

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Abstract

The invention relates to a granulation method of monohydrate magnesium sulfate. The granulation method is that solution with 10wt percent-25wt percent of MgSO4 is taken as an adhesive; the monohydrate magnesium sulfate is granulated in a pan granulator, dried, screened and packaged to form Phi1mm -Phi5mm spherical granular monohydrate magnesium sulfate, the content of MgO of the product is equal to or more than 25 percent, the hardness is equal to or more than 15N / cm<2>. The spherical granular monohydrate magnesium sulfate does not contain impurities brought by other adhesives, and the granule has the advantages of smoothness, uniformity, high hardness, high purity, etc.

Description

Technical field: [0001] The invention belongs to a kind of magnesium sulfate monohydrate (MgSO 4 .H 2 O) the granulation method of powder. Background technique: [0002] Magnesium sulfate monohydrate is a special additive required for the production of compound fertilizers. The water-soluble magnesium oxide is as high as 23%, which can effectively solve the soil magnesium deficiency. At present, the magnesium sulfate monohydrate used in the fertilizer industry is in the form of powder. When used or mixed with other fertilizers, the dust is large, which wastes resources and pollutes the environment. Magnesium sulfate monohydrate granulation has not been reported at present, and some non-fertilizers such as attapulgite are used as binders in the granulation of the fertilizer industry, which affects the main content of the granulated products. Invention content: [0003] The purpose of the present invention is to propose a granulation method of magnesium sulfate monohydrat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/40
Inventor 曹涑旺贺春宝赵毅
Owner NAFINE CHEMICAL INDUSTRY GROUP CO LTD
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