Performance Evaluation of Special Flocculants for Phosphoric Acid Filtration
Results and Analysis of Performance Evaluation of Special Flocculants for Phosphoric Acid Filtration
I. Evaluation of Core Performance Indicators
Phosphate Removal Rate
High-quality flocculants can achieve a phosphate removal rate of up to 99% under laboratory conditions. In practical industrial applications, with precise dosing technology, the total phosphorus concentration in effluent can be stably controlled below 0.2 mg/L, meeting stringent discharge standards. For example, after a phosphorus chemical enterprise adopted the Fe-Al composite phosphorus remover combined with sand filtration process, the phosphate removal efficiency was significantly improved, and the compliance rate of effluent water quality rose by 30%.
Floc Settling Velocity
High-efficiency flocculants accelerate floc formation and boost settling velocity by over 50%. For instance, flocculants containing high-molecular-weight anionic polyacrylamide shorten the gypsum settling time from 90 minutes to 25 minutes in wet-process phosphoric acid purification, greatly lifting production efficiency.
Supernatant Turbidity and Colority
Premium products can reduce supernatant turbidity by more than 90% and cut APHA colority by 50%–70%. As an example, the adsorbent developed by Fubon Co., Ltd. lowers phosphoric acid colority via adsorption to meet food-grade requirements (APHA ≤ 30).
II. Adaptability Analysis for Application Scenarios
Wet-Process Phosphoric Acid Purification
Aiming at colloidal impurities and fine particles in wet-process phosphoric acid, high-molecular flocculants form large flocs through bridging effect and improve filtration efficiency. For example, adding organic flocculants in the pretreatment stage prior to solvent extraction effectively removes fine crystals of calcium salts and barium salts and resolves filtration difficulties.
High-Phosphorus Wastewater Treatment
Composite inorganic high-molecular flocculants (such as iron salt-based agents) deliver outstanding performance in electroplating, chemical, domestic sewage and other scenarios. They realize high-efficiency total phosphorus removal through complexation adsorption, chemical precipitation (generating insoluble substances such as FePO₄) and flocculation, and feature a wide applicable pH range of 5.0–8.5.
Phosphate Rock Flotation and Tailings Treatment
Special flocculants can raise phosphate rock recovery rate and lower tailings moisture content. For example, after an iron ore dressing plant adopted customized flocculants, the moisture content of tailings slurry dropped from 82% to 58%, and the metal recovery rate increased to 78%.
III. Economic and Environmental Assessment
Cost-Benefit Analysis
The required dosage of high-performance flocculants is only 1/3–1/2 of that of ordinary products, achieving a remarkable reduction in overall process costs. For example, Green Singularity products deliver cost savings of over 2 million RMB annually in sand washing and coal washing scenarios thanks to low dosing volume and sludge reduction benefits.
Environmental Compliance
Novel flocculants (such as bio-based products) are non-toxic and harmless and avoid secondary pollution. For instance, after an enterprise adopted safe and eco-friendly phosphorus removal flocculants, the sludge leaching toxicity decreased, and the risk of metal residues complied with environmental standards.
Optimization of Sludge Disposal
High-efficiency flocculants reduce sludge volume by 30%–50% and cut subsequent disposal costs. As an example, a large coal washing plant shortened coal slurry settling time and lowered sludge output by adopting customized anionic flocculants, saving more than 1 million RMB in annual sludge disposal expenses.
IV. Technical Advantages and Industry Recognition
Precise Control of Molecular Weight and Ionic Degree
Leading enterprises customize formulas via R&D centers, enabling products to reach a maximum molecular weight of over 22 million, with ionic degrees precisely matched to water quality demands. For high-turbidity silt-laden water, special flocculants rapidly realize mud-water separation and greatly raise the reuse rate of clean water.
Qualification Certification and Standard Compliance
Premium products have passed the ISO 9001 Quality Management System Certification and conform to national environmental standards including GB/T 17514-2017 Water treatment chemicals—Anionic and non-ionic polyacrylamides. For example, flocculants from a certain enterprise are widely applied in municipal wastewater treatment, and its cationic products boast competitive cost performance in East China.