Phosphoric Acid, Phosphates & Fertilizers Experts

Veolia to deliver crystalline water-soluble fertilizer plant in Tunisia

Veolia Water Technologies will provide a processing plant integrating HPD® crystallization systems designed to produce phosphorus fertilizer of maximum purity and solubility.

The need for increased food production is testing the limits on the earth’s supply of land and water resources. Given these constraints, sustaining and further boosting agricultural productivity is essential. This is a challenge that is all the more evident in regions such as North Africa and southern Europe that rely heavily on irrigation to grow crops.

The use of advanced agricultural techniques such as fertigation and foliar feeding needs multi-nutrient, fully-soluble fertilizer without any impurities that plug sprays and clog irrigation equipment.

To produce pure crystalline fertilizers of the highest-quality, the ALKIMIA Group, a leading Tunisian chemical holding company specialized in the production of phosphate salts for industrial applications, relied on Veolia to deliver its HPD® crystallization technologies at a new 25,000 tons per year mono-ammonium phosphate (MAP) plant located in Gabes, Tunisia.

Integrated to the plant, which will produce higher-value fertilizer for regional export, Veolia designed a circuit to process mono and diammonium phosphate solution through a double crystallization sequence using HPD® PIC™ technology that allows for minimizing the waste purge and achieving higher production yields. The production line includes solid-liquid centrifugal separation, drying, cooling, and screening systems to deliver a product with a large crystal size that has maximum purity (i.e. higher than 99% wt) and solubility (i.e. impurities concentration below 0.2% wt).

Because crystalline fertilizer production operations are complex, delicate and sensitive, Veolia proposed a solution that followed a series of laboratory tests to simulate the crystallization process and confirm its technical feasibility at a bench-scale. This crucial step reduced the risks and gave the ALKIMIA Group the confidence that the proposed technical and commercial process is both straightforward and scalable.