Dithiophosphate 25 (Aerofloat No.25) – Sulfide Ore Flotation Collector-Frother
Application Scope
Dithiophosphate 25 (Aerofloat No.25) is a sulfide ore flotation reagent with both collector and frothing properties. Based on diaryl dithiophosphoric acid chemistry, it provides strong mineral surface adsorption and selective flotation performance in complex polymetallic sulfide separation circuits.
Lead-Zinc Polymetallic Sulfide Ore Flotation
Dithiophosphate 25 is widely applied in lead-zinc differential flotation, especially for selective galena recovery in alkaline circuits. Under alkaline conditions, its weaker collecting ability toward pyrite and other iron sulfide minerals helps improve separation efficiency between galena, sphalerite and pyrite, supporting higher lead concentrate grade and recovery performance.
Copper, Lead and Silver Sulfide Mineral Recovery
As an effective collector for copper sulfide, lead sulfide, silver-bearing sulfide minerals and activated zinc sulfide ores, Dithiophosphate 25 chemically adsorbs onto mineral surfaces to improve hydrophobicity and flotation response. In complex copper-lead-zinc sulfide flotation systems, it has demonstrated practical application value for improving concentrate quality and valuable metal recovery.
Nickel and Copper-Zinc Polymetallic Sulfide Flotation
Dithiophosphate 25 is suitable for flotation operations involving sulfide copper ores, nickel ores and copper-zinc polymetallic deposits. Its adaptability across different sulfide mineral systems provides flexibility for mineral processing plants treating complex ore bodies.
Gold and Precious Metal-Bearing Sulfide Ores
For precious metal-bearing sulfide ores, including silver-associated and copper-gold polymetallic ores, Dithiophosphate 25 can contribute to the recovery of valuable sulfide minerals through selective collector performance.
Special Applications
Under specific processing conditions, Dithiophosphate 25 may provide collecting effects for certain heavy metal oxide minerals. It can also be applied in combined sulfuric acid roasting and flotation processes for recovering valuable metals such as copper and lead from treated residues.
Mechanism
The active component of Dithiophosphate 25 is diaryl dithiophosphoric acid. Its flotation mechanism is based on chemical adsorption between the dithiophosphate functional group and metal ions on mineral surfaces, including Pb²⁺, Cu⁺ and Ag⁺, forming a hydrophobic surface layer that improves mineral floatability.
The phenolic structure within the molecule also contributes frothing characteristics, allowing Dithiophosphate 25 to provide combined collector and frother functions in flotation reagent systems.
Its flotation behavior is strongly related to pH conditions. In neutral or acidic media, it shows stronger non-selective collecting ability toward sulfide minerals. In alkaline circuits, its reduced pyrite collecting ability supports improved selectivity during sulfide mineral separation.
Physicochemical Properties
| Parameter | Detail |
|---|---|
| CAS Number | Not established for mixture; 10533-41-2 (dibutyl analogue reference) |
| Main Component | Diaryldithiophosphoric acid (dimethylphenyl substituted) |
| Appearance | Black-brown oily liquid with pungent odor; corrosive |
| Density (20°C) | 1.17–1.20 g/mL |
| Active Content | 60–70% dimethylphenyl dithiophosphate |
| Solubility | Slightly soluble in water; forms acidic solution |
| Standard | YS/T 249-2011 China Nonferrous Metals Industry Standard |
| Packaging | 200 kg steel drums or 1000 kg IBC tanks |
Specifications
Dithiophosphate 25 is supplied as an industrial flotation reagent designed for mineral processing applications. Product performance depends on ore characteristics, flotation circuit conditions, reagent dosage and pH control.
Suitable for sulfide mineral flotation applications.
Compatible with lead-zinc, copper, nickel and polymetallic sulfide processing circuits.
Requires process adjustment according to mineral composition and flotation conditions.
Storage & Handling
Store Dithiophosphate 25 in a cool, dry and well-ventilated area away from moisture, direct sunlight and heat sources. The product is combustible and may decompose after prolonged exposure to air and sunlight.
Due to limited water solubility, Dithiophosphate 25 should normally be added directly into conditioning tanks or ball mills in its original form to maintain effective dispersion and flotation performance.
Operators should use appropriate personal protective equipment, including chemical-resistant gloves, protective clothing and safety goggles. Avoid direct skin contact and inhalation of vapors. Under recommended storage conditions, shelf life is approximately 12–24 months.
Advantages / Limitations
Advantages
pH-responsive flotation selectivity for sulfide mineral separation.
Dual collector-frother functionality simplifies flotation reagent systems.
Applicable to complex polymetallic sulfide ore processing.
Recognized under YS/T 249-2011 industry standard.
Compatible with sulfuric acid roasting and flotation combined processes.
Suitable for lead, copper, zinc, nickel and precious metal sulfide flotation applications.
Limitations
Limited water solubility requires direct addition without dilution.
Strong odor and corrosive characteristics require careful handling.
Requires pH control because selectivity decreases in acidic circuits.
Mixture composition may vary depending on supplier formulation.
Summary
Dithiophosphate 25 (Aerofloat No.25) is a proven collector-frother flotation reagent for lead-zinc differential flotation, copper-lead-silver sulfide recovery, nickel sulfide processing and polymetallic mineral separation. Its pH-dependent flotation behavior enables selective sulfide mineral recovery in alkaline circuits while maintaining strong collecting performance across complex ore systems.
With recognized industrial application experience and compatibility with various sulfide flotation processes, Dithiophosphate 25 provides a reliable reagent option for mining operations seeking stable mineral beneficiation performance.
No.25 Black Collector – FAQ
Q1. Which sulfide ores are most suitable for No.25 Black Collector flotation?
No.25 Black Collector is a widely used sulfide mineral collector applied in the flotation of copper, lead, zinc, nickel, gold-associated sulfide, and polymetallic ores. It is mainly valued for its collecting ability and selectivity toward certain sulfide minerals, making it suitable for flotation circuits where recovery of valuable sulfide minerals is required. Typical applications include copper sulfide, lead-zinc sulfide, and complex polymetallic flotation systems. The actual performance depends on ore mineralogy, liberation size, pulp chemistry, and reagent conditions. Laboratory flotation testing is recommended to determine the optimal dosage and compatibility with other flotation reagents.
Q2. How does No.25 Black Collector perform in copper-molybdenum sulfide flotation?
In copper-molybdenum sulfide flotation circuits, No.25 Black Collector can be used as a selective collector to improve the recovery of copper-bearing sulfide minerals. Its application is often considered when a balance between mineral recovery and concentrate quality is required. In bulk copper flotation stages, No.25 Black Collector may be combined with xanthates or other collectors to enhance flotation performance. For copper-molybdenum separation, reagent dosage, pulp pH, depressant selection, and frother conditions should be optimized according to ore characteristics. Laboratory and pilot-scale testing are recommended before industrial application.
Q3. Is No.25 Black Collector suitable as a primary collector for nickel-cobalt sulfide ores?
No.25 Black Collector can be considered for nickel-cobalt sulfide flotation depending on mineral composition and process requirements. It may contribute to the recovery of nickel-bearing sulfide minerals such as pentlandite and associated valuable sulfide phases. In complex nickel-cobalt deposits, it is often evaluated as a primary or auxiliary collector together with xanthates, activators, and flotation modifiers. The flotation response is influenced by mineral oxidation, particle size distribution, pulp potential, and gangue interference. Bench-scale flotation testing helps determine whether No.25 Black Collector can achieve the required recovery and selectivity for specific ores.
Q4. How does No.25 Black Collector help in gold-bearing sulfide ore enrichment?
No.25 Black Collector can support gold recovery from sulfide-associated gold ores by improving the flotation recovery of sulfide minerals that carry or are associated with gold values. It does not directly collect free gold but helps concentrate gold-bearing sulfide minerals such as pyrite and other sulfide phases before further metallurgical treatment. The effectiveness depends on gold occurrence, sulfide association, mineral liberation, and flotation conditions. For gold sulfide ores, mineralogical analysis and laboratory flotation tests are important to evaluate whether No.25 Black Collector can improve sulfide concentrate recovery and contribute to higher gold enrichment.
Q5. Is No.25 Black Collector suitable for platinum group metal (PGM) associated ores?
No.25 Black Collector may be applied in flotation circuits for platinum group metal (PGM) ores where valuable metals are associated with sulfide minerals. Its primary role is to improve the flotation recovery of sulfide mineral carriers that contain or are closely related to PGM values. Since PGM ores usually have complex mineral associations and strict concentrate requirements, collector selection requires detailed evaluation of mineralogy, flotation kinetics, and reagent interactions. Laboratory testing under representative conditions is recommended to determine whether No.25 Black Collector provides suitable recovery and selectivity for specific PGM processing applications.
Q6. What flotation advantages does No.25 Black Collector provide when combined with xanthate collectors?
The combination of No.25 Black Collector with xanthate collectors can provide complementary flotation performance in complex sulfide ore systems. Xanthates generally provide strong collecting capability, while No.25 Black Collector may improve selectivity or enhance recovery of certain sulfide minerals depending on ore characteristics. This combined collector strategy is commonly evaluated in copper, lead-zinc, nickel, and polymetallic flotation circuits where a single collector cannot achieve the desired balance between recovery and concentrate grade. The optimum reagent combination depends on mineral composition, pulp conditions, and flotation circuit design, which should be confirmed through laboratory testing.
Q7. Is No.25 Black Collector suitable for fine-grained disseminated sulfide ores?
No.25 Black Collector can be applied to fine-grained disseminated sulfide ores, although flotation efficiency depends strongly on mineral liberation and surface properties. For finely distributed valuable minerals, insufficient liberation, surface oxidation, or slime coating may reduce collector adsorption and flotation recovery. Process optimization measures such as controlled grinding, pulp conditioning, dispersant addition, and combined reagent systems may be required. The appropriate dosage and application method should be determined through bench-scale flotation testing to achieve a suitable balance between mineral recovery, concentrate quality, and reagent consumption.
Q8. How does high clay content in slurry affect No.25 Black Collector flotation performance?
High clay content in flotation slurry may affect the performance of No.25 Black Collector by increasing reagent consumption, covering valuable mineral surfaces, and interfering with bubble-particle attachment. In clay-rich ore processing operations, additional measures such as desliming, dispersant use, pulp conditioning, and water chemistry adjustment may be required. The influence of clay depends on mineral type, concentration, and interaction with valuable sulfide minerals. A systematic flotation evaluation can help determine suitable No.25 Black Collector dosage and whether auxiliary reagents are required for stable plant performance.
Q9. Is No.25 Black Collector suitable for flotation circuits with low-grade resources or tailings retreatment?
No.25 Black Collector can be considered for tailings retreatment and low-grade sulfide resource recovery projects where valuable minerals remain associated with sulfide phases. Its application may help improve the recovery of residual sulfide minerals from previously processed materials when suitable liberation and flotation conditions exist. The effectiveness depends on tailings mineralogy, particle size distribution, surface oxidation degree, and remaining valuable mineral content. Before industrial implementation, laboratory flotation tests are recommended to evaluate recovery potential and determine the appropriate reagent scheme for secondary resource recovery applications.
Q10. What factors should be considered when applying No.25 Black Collector in overseas mining projects?
For overseas mining projects, the application of No.25 Black Collector should be evaluated according to ore characteristics, flotation flowsheet design, water quality, and operating conditions. It is commonly considered for copper, lead-zinc, nickel, gold-associated sulfide, and polymetallic flotation applications. Important parameters include pulp pH, grinding fineness, conditioning time, reagent dosage, and compatibility with other collectors and modifiers. Technical evaluation through laboratory testing and process trials helps ensure reliable flotation performance and supports stable operation under different mining environments.