Calcined phosphate rock

Calcined phosphate rock (CAS 65996-94-3), also known commercially as Phospal and Calciphos, is a thermally processed mineral used as a slow-release phosphorus source and soil pH corrective in agricultural markets.

Where is Calcined phosphate rock used?

• Crop nutrition: direct-application phosphate fertilizer for acidic soils, supplying phosphorus and calcium over extended growing cycles
• Animal feed: mineral supplement meeting phosphorus and calcium requirements in livestock and poultry diets
• Water treatment: pH adjustment and phosphate dosing where controlled, gradual release is preferred
• Downstream phosphate chemicals: raw material input where a calcined, low-organic mineral source is specified
• The calcination process converts raw phosphorite into a more reactive form, improving phosphorus availability to crops without rapid leaching.

Commercial specifications

• P2O5 content and heavy metal limits define grade boundaries for procurement
• Fine to medium powder, particle size typically tailored to application requirements