Method for producing granular ammonium sulfate by using crystalline ammonium sulfate or powdery ammonium sulfate

Abstract

The invention relates to a method for producing granular ammonium sulfate by using crystalline ammonium sulfate or powdery ammonium sulfate. The method comprises the following steps: (1) adding the crystalline ammonium sulfate or the powdery ammonium sulfate into a granulating drier, using as mother material and forming a material screen or a material bed under the rotation of a rotary drum; (2) mixing sulfuric acid, ammonia, phosphoric acid and washing liquid in a tubular reactor, reacting, generating high-temperature slurry, spraying the slurry on the material screen or the material bed in agranulating machine after atomizing, and coating or sticking into particles; (3) after dedusting, washing the tail gas with the phosphoric acid and recycling the washing liquid; returning the collected dust to the granulating machine; (4) sieving material produced by the granulating drier to obtain particles of 1-4mm, which is a finished product of the granular ammonium sulfate; and returning theparticles greater than 4mm after being crushed and the particles smaller than 1mm to the granulating drier and recycling. The method can raise the temperature of a granulating material layer by the high-temperature slurry, improve the granulation rate of the mother material, lower the material return ratio, wash the tail gas with the phosphoric acid, reduce the loss of the ammonia, dry a productby reaction heat and save energy consumption; the generated product has high strength and little loss of nutrient components.

Description

technical field [0001] The present invention relates to chemical fertilizer products, more specifically, to the production of ammonium sulfate, in particular to the method for producing granular ammonium sulfate. Background technique [0002] Sulfur is an intermediate nutrient element needed by crops. If sulfur cannot be replenished in time, it will seriously affect the yield of crops such as grain. 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 a good market prospect because of its high sulfur content, convenient transportation and being suitable for blending with other fertilizers. [0003] Ammonium sulfate is a sulfur-nitrogen fertilizer with a long history of use. Its appearance is white or slightly yellow orthorhombic rhombic fine grains. Therefore, it is...

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Problems solved by technology

[0006] There is no report on the production of granular ammonium sulfate from crystalline ammonium sulfate or powdered ammonium sulfate

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