Kemira Growhow Oyj

Kemira Agro Oy

Yara Suomi Oy

Yara International Asa

Juhani Poukari

Heikki Hero

Anders Weckman

Mikko Lylykangas

Paula Ylinen

Harri Kiiski

Robert John Milborne

Eija Saarikko

Arthur Van Brempt

The invention relates to a fertilizer granule containing ammonium nitrate, comprising a core containing ammonium nitrate and a coating layer containing calcium sulphate. The coating layer consists of a mixture containing calcium sulphate and ammonium nitrate. Such a fertilizer granule is preferably produced by contacting the core with an aqueous ammonium nitrate solution and solid calcium sulphate particles, either as a slurry or separately. The production of the fertilizer granule is safe and easy.

Ammonium nitrate granule and method for the preparation of the same

The invention relates to a method for preparing a suspension containing phosphate stepwise directly from raw materials, from phosphoric acid of fertilizer quality, a base and organic additives. In accordance with the method, the phosphoric acid is preneutralised with the base, the organic additives are added, nucleation is controlled and phosphate salts are cooling crystallised in order to form a suspension. The phosphate suspension prepared with the method of the invention is applicable to seed coating.

Method for preparing a suspension containing phosphate

The invention relates to a method for producing thermally and mechanically stable ammonium nitrate by dissolving in nitric acid 1&#x2013;3% by weight of reticulated metal silicate, before treatment with ammonia. The ammonium nitrate granules produced by this method swell very little, they do not considerably cake, and their granule strength is high.

Stabilized ammonium nitrate granules

Process for stabilizing ammonium nitrate

The invention relates to a process for the preparation of compound fertilizer granules containing at least two of the plant nutrients nitrogen, phosphorus and potassium, said process including the steps of: providing a solid fee material including at least one solid fertilizer raw material and optionally recycle material, feeding the feed material or a part thereof into a melter for melting a desired portion thereof and keeping said portion in molten state, feeding the molten or partly molten material and optionally other desired solid raw materials to a granulator to obtain a granulated product, and cooling and optionally screening the granulated product to obtain dry compound fertilizer granules having a desired size distribution, provided that no water or aqueous liquid is introduced into the process.

Process for the preparation of compound fertilizer granules

Growing community of inventors

Masala, Finland

Juhani Poukari