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Method for producing granular potassium sulfate

A production method and technology of potassium sulfate, applied in the directions of potash fertilizers, fertilizer mixtures, inorganic fertilizers, etc., can solve the problems of nutrient distribution ratio limitation, etc., and achieve the effects of low production cost, short technological process and smooth surface.

Active Publication Date: 2012-09-26
HENAN LEEF FERTILIZER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Granular potassium sulfate with lower nutrients, as a raw material for blended fertilizers, is often limited by the ratio of nutrients

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT: The process of the present invention is described through the following examples. However, the examples do not limit the invention.

example 1

[0018] Preparation of binder: Add 420 parts of water into the jacketed reactor, start stirring, heat to 70°C, add 45 parts of polyvinyl alcohol under stirring, heat up to 90°C, keep warm until the polyvinyl alcohol is completely dissolved into a transparent solution . Then cool the solution down to 50°C, add 1 part of polyoxyethylene castor oil, continue to add 0.5 part of polyoxyethylene octylphenol ether and 1 part of dibutyl phthalate, maintain 50°C, stir for 30 minutes, and cool down To 30°C, slowly add 70 parts of sodium silicate under rapid stirring, after the addition is complete, keep at 40°C, continue to stir and react for 0.5 hours, and then discharge to obtain the binder.

[0019] This example is batch production. Add 1,000 kg of powdered potassium sulfate with a fineness of less than 60 meshes to the disc granulator, spray 10 kg of the above prepared binder, and rotate and granulate into balls in the disc granulator. After drying, cooling and sieving, 910 kg of g...

example 2

[0021] Preparation of binder: Add 500 parts of water into the jacketed reactor, start stirring, heat to 70°C, add 40 parts of polyvinyl alcohol under stirring, heat up to 90°C, keep warm until the polyvinyl alcohol is completely dissolved into a transparent solution . Then cool the solution down to 50°C, add 0.2 parts of polyoxyethylene castor oil, continue to add 0.4 parts of polyoxyethylene octylphenol ether and 0.6 parts of dibutyl phthalate, maintain 50°C, stir for 30 minutes, and cool down To 30°C, slowly add 60 parts of sodium silicate under rapid stirring, after the addition, keep at 40°C, continue to stir and react for 0.5 hours, and then discharge the material to obtain the binder.

[0022] This example is for continuous production. Add the powdered potassium sulfate with a fineness of less than 60 mesh into the drum granulator at 1000 kg / hour, spray the above-mentioned binder at 40 kg / hour, and granulate into balls in the drum granulator . After drying, cooling an...

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Abstract

The present invention relates to a method for producing granular potassium sulfate, belonging to the technical field of fertilizer manufacturing. The method includes the specific steps of preparation of an adhesive and granulation of powdery potassium sulfate. The preparation of the adhesive includes the following steps: adding water to a reactor having a jacket so as to dissolve polyvinyl alcohol; adding polyoxyethylene castor oil at a preset temperature; adding polyoxyethylene octyl phenol ether and dibutyl phthalate according to a formula; cooling the mixture after a certain reaction time; adding sodium silicate for a certain time of reaction at a certain temperature to obtain the adhesive. The granulation of the powdery potassium sulfate includes the following steps: adding the powdery potassium sulfate with fineness less than 60 mesh to a disk or a rotary drum granulator; adding the prepared adhesive proportionately to the rotating materials to perform granulation, drying, cooling and screening are performed on the granulated material to produce a product. The granular potassium sulfate produced by the method in the invention is advantaged in round and uniform particle, smooth surface and high particle strength, being capable of being directly applied and being used as raw material of a blending fertilizer.

Description

technical field [0001] The invention relates to a production method of granular potassium sulfate, which belongs to the technical field of fertilizer manufacture, and in particular relates to a method for producing granular potassium sulfate by using powdery potassium sulfate as a raw material. Background technique [0002] Nitrogen, phosphorus, and potassium are the three essential nutrients for crops. Potassium fertilizer mainly includes potassium chloride and potassium sulfate. Potassium chloride is used in a large amount, but for tobacco, tea tree, peach tree, grape, potato, sweet potato, beet, citrus, sugar cane, watermelon and other crops that avoid chlorine, potassium sulfate is the best choice of potassium fertilizer. Potassium sulfate products on the market are mostly in powder form, and powder products are inconvenient to fertilize, and are easily dissolved in rainwater or irrigation water, which can easily cause loss and imbalance of soil nutrients. Granular pot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05D1/02
Inventor 万亚珍谷守玉张文辉
Owner HENAN LEEF FERTILIZER
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