Method for producing granular ammonium sulfate

Abstract

The invention relates to a method for producing granular ammonium sulfate. The method comprises the following steps: (1) mixing sulfuric acid, ammonia and tail gas washing liquid in a reactor, reacting and generating high-temperature ammonium sulfate slurry; (2) using a spray nozzle to pressurize and atomize the high-temperature slurry and then spraying on a material screen or a material bed in agranulating drier, coating or sticking into particles and obtaining ammonium sulfate particles; (3) after dedusting and washing, despumating the tail gas of the granulating drier, evacuating and recycling the washing liquid for washing the tail gas; (4) sieving material produced by the granulating drier to obtain particles of 1-4mm, which is the granular ammonium sulfate; cooling and taking as a finished product after cooling, and then delivering for packaging; and mixing the particles greater than 4mm after being crushed and the particles smaller than 1mm, taking as return material, delivering into the granulating drier by a material return belt and recycling. The method can enhance the temperature of the granulating material by reaction heat, improve the property of the material, assistthe granulation of the material and achieves the purposes of saving energy consumption and drying the material; and the obtained product has high strength and little loss of nutrient components. The invention is suitable for the production manufacturer of the granular ammonium sulfate.

Description

Technical field [0001] The present invention relates to chemical fertilizer products, and further relates to the production of ammonium sulfate, specifically to a production method of granular ammonium sulfate. Background technique [0002] Sulfur is a moderate nutrient required by crops. If sulfur cannot be replenished in time, it will seriously affect the yield of grain and other crops. Sulfur-containing fertilizers not only increase crop yields, but also improve product quality. Therefore, the demand for sulfur fertilizers and ammonium sulfate is increasing in the United States, Japan, Australia and other countries. Granular ammonium sulfate has good market prospects because of its high sulfur content, easy product transportation and suitable for blending with other fertilizers. [0003] Ammonium sulfate is a sulfur-containing nitrogen fertilizer with a long history. It appears as white or slightly yellow rhombus-shaped fine grains. Therefore, it is difficult to granulat...

AI Technical Summary

Problems solved by technology

With the development of the market economy, the development of large-scale agricultural mechanization is getting faster and faster, and the current crystal form cannot meet the requirements of agricultural mechanization and fertilization

[0004] At present, the production of granular ammonium sulfate generally uses crystalline ammonium sulfate plus a binder and then extrudes and granulates, or mixes crystalline ammonium sulfate with urea and other fertilizers and then melts and granulates. Among them, extrusion granulation has poor product strength and many nutrient deficiencies. The problem is that the product strength cannot meet market requirements, and melt granulation requires a lot of energy due to the high melting point of ammonium sulfate (about 512°C), and high energy consumption consumes the profit margin of granular ammonium sulfate

[0005] 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 produce The method of granular fertilizer containing urea and ammonium sulfate, but because its urea concentration is as high as 70% to 99.9%, the content of ammonium sulfate itself is reduced, its components are changed, and the content of S is reduced

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