What is a Superphosphate Fertilizer Production Line?

 Core Function: Realizing Industrial Conversion from “Phosphate Rock to Superphosphate”

1. Chemical Reaction Conversion: The acidolysis reaction between sulfuric acid and phosphate rock powder breaks the stable chemical structure of phosphate rock, generating water-soluble monocalcium phosphate (available phosphorus) and calcium sulfate (gypsum, serving as a calcium source in fertilizers).
2. Process Control Guarantee: Precisely control key parameters such as reaction temperature, acid-to-ore ratio, and curing time to ensure the available phosphorus content meets standards (qualified products require available phosphorus ≥ 12%) while preventing excessive impurities from affecting fertilizer efficiency.
3. Continuous Production: Through the linkage of multiple equipment, it realizes continuous operations from raw material pretreatment, reaction, and curing to finished product processing, meeting the needs of large-scale production (small-scale lines produce dozens of tons per day, and large-scale lines produce hundreds of tons per day).

Core Composition: 6 Key Equipment Modules and Their Roles

Production Process: 4 Core Steps

1. Raw Material Pretreatment: Crush and grind phosphate rock → Dilute sulfuric acid to ensure the fineness and concentration of both raw materials meet reaction requirements.
2. Acidolysis and Chemical Conversion: Rapidly mix diluted sulfuric acid and phosphate rock powder in a mixer, then transfer to a chemical conversion tank to complete the reaction and generate paste-like slurry.
3. Curing and Aging: Transfer the paste-like slurry to a curing warehouse, stack and cure for 15-20 days, with regular ventilation to promote complete reaction and reduce free acid content.
4. Finished Product Processing: Crush the cured material blocks → Screen → (optionally mix with other nutrients) → Package to finally obtain superphosphate finished products.

Application Scenarios and Characteristics

1. Application Scenarios:
   • Small and medium-sized phosphate fertilizer manufacturers: The production line has relatively low investment (small-scale lines cost several million yuan), mature technology, and easy operation. It is suitable for areas rich in phosphate rock resources or close to agricultural production areas.
   • Targeted fertilization needs: Superphosphate is suitable for phosphorus-deficient and calcium-deficient soils (such as alkaline soils in northern China), especially for phosphorus-demanding crops like wheat, corn, and cotton. The production line can directly provide supporting fertilizers for local agriculture.
2. Core Characteristics:
   • Advantages: Easy access to raw materials (phosphate rock and sulfuric acid are common chemical raw materials), mature technology, low cost of finished products, and dual nutrients of phosphorus and calcium.
   • Disadvantages: Low available phosphorus content (compared to diammonium phosphate and triple superphosphate); finished products are prone to moisture absorption and caking, requiring attention to storage conditions; harmful gases are generated during production, making environmental protection equipment investment essential.