An investigation of the effect of ammonium sulfate addition on compound fertilizer granulation--颗粒学报PARTICUOLOGY

Xue, B., Huang, H., Mao, M., & Liu, E. (2017). An investigation of the effect of ammonium sulfate addition on compound fertilizer granulation. Particuology, 31, 54-58. https://doi.org/10.1016/j.partic.2016.04.004

An investigation of the effect of ammonium sulfate addition on compound fertilizer granulation

Bingchun Xue, Hua Huang, Meiling Mao, Erbao Liu ^*

School of Chemistry and Materials Science, Shanxi Normal University, Linfen 041000, China

10.1016/j.partic.2016.04.004

Volume 31, April 2017, Pages 54-58

Received 11 January 2016, Accepted 28 April 2016, Available online 25 July 2016, Version of Record 9 March 2017.

E-mail: liueb@sxnu.edu.cn

Highlights

• The granulation of humic acid compound fertilizer was investigated.

• Effect of addition of ammonium sulfate on compound fertilizer granulation was investigated.

• The addition of ammonium sulfate could improve granulation rate and fertilizer quality.

Abstract

We investigated the effect of small amounts of ammonium sulfate (NH₄)₂SO₄ on compound fertilizer granulation. We examined the following raw materials: humic acid, ammonium chloride, urea, potassium chloride, and monoammonium phosphate. The mass ratio of organic matter, nitrogen, phosphorus, and potassium was typically 22:17:7:2. In the absence of (NH₄)₂SO₄, the granulation rate of the compound fertilizer was low, and increased significantly following the addition of 1–2% (NH₄)₂SO₄. We suggested the following physical and chemical processes as potential mechanisms: (NH₄)₂SO₄ promoted the conversion of yellow flue gas desulfurization gypsum into gypsum whiskers; (NH₄)₂SO₄ interacted with humic acid and urea to generate a new complex; urea sulfate was formed under acidic conditions. The combined effect of the above physical and chemical processes was an increase both in the rate of interactions between the materials and in system viscosity, which has the end result of increasing the granulation rate.

Graphical abstract

Keywords

Compound fertilizer; Granulation; Ammonium sulfate

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