Technical Parameters of Special Flocculants for Phosphoric Acid Filtration
The technical parameters of special flocculants dedicated to monoammonium phosphate and diammonium phosphate filtration are specified as follows:
I. Raw Material Composition
Acrylamide: 90–120 kg
Deionized Water: 45–60 kg
Urea: 0.5–3 kg
Thiourea: 1–4 kg.
2,2'-Azobis(2-amidinopropane) dihydrochloride (AAPH): 0.001–0.009 kg
Disodium Ethylenediaminetetraacetate (Disodium EDTA): 0.001–0.008 kg.
Ammonium Persulfate: 0.001–0.008 kg.
Sodium Bisulfite: 0.001–0.009 kg
II. Product Characteristics
High Molecular Weight
The product features an elevated molecular weight, which helps improve flocculation performance.
Excellent Solubility
The product dissolves easily in water for convenient field application.
Rapid Dissolution Rate
It can rapidly dissolve in water to form homogeneous flocculant solution.
High-Efficiency Flocculation Performance
The settling velocity of flocs is accelerated; the solid concentration of supernatant liquid is markedly reduced, lowering the loss of phosphate minerals carried away by overflow.
III. Preparation Process
Raw Material Preparation
Prepare all raw materials in accordance with the above mass ratios.
Raw Material Pretreatment
Load raw materials into a polymerization tank, introduce high-purity nitrogen, and turn on ultraviolet lamps to initiate polymerization reaction. After 0.5–2 hours of reaction, semi-transparent gel blocks are formed.
Additive Incorporation
Transfer the gel blocks into a kneader, add additives including sodium carbonate or sodium hydroxide and urea, then introduce steam to carry out hydrolysis and granulation.
Drying and Milling
Dry the granular materials at a temperature of approximately 90–100°C, followed by milling to obtain powdery finished product.
Packaging
Package the milled powdery material to obtain the finished special flocculant for phosphoric acid filtration.
IV. Application Effects
Improved Filtration Efficiency
During ammonium phosphate production, the adoption of this flocculant enhances the filtration efficiency of ore pulp and boosts overall production output.
Reduced Phosphorus Content in Residue Slag
Through flocculation, phosphate minerals contained in ore pulp aggregate into particles larger than the aperture of filter cloth, thereby lowering the phosphorus content of residue slag.
Optimized Product Quality
The application of this flocculant contributes to quality improvement of ammonium phosphate finished products.