Fertilizer Plants

Crystalline Fertilizer

Granular Fertilizer

The Fertilizer Plant produces 260,000 t/a of ammonium sulphate fertilizer - crystalline (21-0-0) and granular (20-0-0) – from scrubber solution of weak ammonium sulphate and excess 93% sulphuric acid generated by the metallurgical operations in controlling sulphur gas emissions. Anhydrous ammonia for fertilizer production is shipped to the plant from Alberta in rail tank cars.

Granular ammonium sulphate is produced by direct neutralization of 93% sulphuric acid with anhydrous ammonia in a pipe reactor. The molten salt from the reactor discharges into a bed of recycled fines in a granulator to form spherical pellets. After drying, cooling and screening this product is shipped in bulk to various markets.

The crystalline product is produced by evaporating a weak scrubber solution in two crystallizers operating in series. Large crystals are separated from the mother liquor in vertical screen centrifuges and dried in three gas fired driers. The dried product is screened and shipped to various markets by rail and truck.

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