Phosphate fertilizers

Guichon manufactures valves specially adapted to the production of Phosphate fertilizers :

Check valve & Sight glasses & Strainers, Ball and plug valve, Tank bottom valve, Gate valve

Ball type axial check valve
Type : 904

DN 1/2" to 8" Class 150 to 600 Lbs

– Stainless and duplex steels, nickel alloys, spec-ial alloys (titanium, zirconium)

Bottom outlet valve
Type : 652M

DN 3" Class 150 Lbs
– Pneumatic actuator with positionner and regulator-filter

Double disc gate valve
Type : 700

DN 1/2" to 36" Class 150 to 2500 Lbs
– Fabricated (welded) construction
– Stainless and duplex steels, nickel alloys and special alloys


  • Construction materials: Carbon Steel (CS), Stainless Steel (SS), Duplex & Super Duplex, Titanium, Zirconium, Uranus® B6, Tantalum, Nickel, Hastelloy®, Monel
  • Construction methods: Fabricated (Welded), Cast, Solid


  • Service conditions: High pressure, High temperature, Low temperature, Abrasion, Corrosion, High viscosity, Vacuum, Reliability, Low acoustic signature, Dead space free
  • Types of fluids: Liquids, Liquids with solid particles, Gas, Powder and powdery media, High viscosity fluids

FAQ - Phosphate fertilizers

Phosphate fertilizers – Chemical formula :

Calciums phosphate Ca3 (PO4) 2, aluminum phosphate, ammonium phosphate (NH4)3PO4

Posted in: FAQ - Phosphate fertilizers

Phosphate fertilizers – Manufacturing process of Phosphate fertilizers

Phosphate rock (PR) is the raw material used in the manufacture of most commercial phosphate fertilizers on the market. With access to large, high-quality reserves of
phosphate rock, Morocco, China and US are the most important players in phosphate industry.

Ground phosphate rock from the mines is first sent to recovery units to separate sand and clay and to remove impurities. Most of the processes are wet to facilitate material transport and to reduce dust.

A weak phosphoric acid (40-55%) is produced from the reaction of PR with sulfuric acid, using a wet- process. The obtained phosphoric acid is then used in the production of a series of liquid or solid fertilizers. The most important ones are single and triple superphosphates (SSP, TSP) and ammonium phosphates (MAP, DAP). Usually the plants are using flexible process technologies, allowing the manufacture of at least two products with interchangeable lines (e.g. TSP and DAP combination).

SSP is simple to produce but is nowadays less popular. TSP results from the reaction of PR with phosphoric acid, using the common Dorr-Oliver slurry granulation process. GTSP (granulated TSP) is obtained in this way, with very good storage and handling properties.

Economical and with high nutrient content, ammoniated phosphates such as mono- and di-ammonium phosphate (MAP, DAP) are another popular choice of fertilizers. They are obtained when ammonia (liquid or gaseous) is added to the weak phosphoric acid.

Phosphate fertilizers production flow-cart can be illustrated in the following figure :

Example of the phosphate fertilizers process

Posted in: FAQ - Phosphate fertilizers

Phosphate fertilizers – Recommended valves :

Corrosive conditions caused by acids such as phosphoric and sulfuric acid impose an extra care when choosing the suitable materials for the equipment as valves for example. Depending on the rock impurity content, fluoride and chloride influence can also be considered.

Posted in: FAQ - Phosphate fertilizers