Oxidized Paraffin Soap (731 / 733 Flotation Agent) – Collector for Tungsten, Fluorite & Oxidized Mineral Flotation
Application Scope
Oxidized Paraffin Soap (731 / 733 Flotation Agent) is an anionic collector produced from petroleum-derived paraffin wax through oxidation and saponification. It contains long-chain fatty acids (C18–C32) that form hydrophobic complexes with mineral surfaces while also providing natural frothing properties during flotation.
As a low-cost and non-toxic alternative to conventional fatty acid collectors, Oxidized Paraffin Soap is widely applied in oxidized mineral flotation, particularly for tungsten, fluorite, iron and other non-sulfide mineral beneficiation systems.
Tungsten Ores – Scheelite & Wolframite (Primary Application)
Tungsten beneficiation represents the largest and most established application of Oxidized Paraffin Soap. The reagent is widely recognized for scheelite and wolframite flotation due to its strong collecting ability for calcium-bearing tungsten minerals.
The classic "731 room-temperature flotation method" developed at Dangping Tungsten Mine uses oxidized paraffin soap as both collector and frother, with sodium silicate as depressant under alkaline conditions around pH 9. This process achieved scheelite concentrate grades of 65% WO₃ while eliminating the need for energy-intensive heating operations.
For high-calcium scheelite rough concentrates, industrial studies demonstrate that oxidized paraffin soap combined with oleic acid (800 g/t + 50 g/t) can achieve a WO₃ concentrate grade of 62.74% with a recovery rate of 97.13%.
For mixed black and white tungsten ores, combining 733 grade with stronger collecting power and standard 731 grade with improved selectivity enables flexible reagent adjustment. Rougher flotation recoveries of 77–83% have been reported using optimized grade combinations.
Fluorite (Calcium Fluoride)
Oxidized Paraffin Soap demonstrates effective collecting performance for fluorite flotation. For simple low-grade fluorite ores, it can be applied as a standalone collector to achieve suitable recovery and concentrate quality.
In more complex fluorite-barite separation circuits, oxidized paraffin soap can be combined with N-alkyltrimethylene diamine in specific ratios. This mixed collector system improves selective adsorption on fluorite surfaces and supports separation of minerals with similar flotation characteristics.
Iron Ores – Hematite & High-Phosphorus Iron Ores
Oxidized Paraffin Soap is applied in iron ore beneficiation, especially in reverse flotation processes.
For hematite removal from pyrolusite (MnO₂), the reagent demonstrates strong adsorption and selectivity among common collectors, supporting efficient iron mineral separation.
For high-phosphorus iron ores, oxidized paraffin soap can be formulated into reverse-flotation dephosphorization collector systems. These formulations effectively reduce phosphorus content while maintaining cost-efficient reagent consumption.
Other Applications
Oxidized Paraffin Soap also finds supplementary applications in lithium ore (spodumene), titanium ore (ilmenite), boron ore, phosphate rock and bauxite flotation.
Its combined collecting and frothing properties provide application value for various oxidized mineral systems where stable flotation performance is required.
In boron ore beneficiation, oxidized paraffin soap has been investigated as a collector for boron-magnesium mineral separation.
Mechanism
As an anionic collector, Oxidized Paraffin Soap interacts with mineral surfaces through chemisorption mechanisms.
The long-chain fatty acid groups chemically bond with metal cations on mineral surfaces, creating hydrophobic adsorption layers that promote attachment of mineral particles to air bubbles.
The carboxylic acid groups (–COOH) participate in surface metal coordination, while the hydrocarbon chains provide hydrophobic properties. Its natural frothing characteristics contribute to stable foam formation during flotation.
The 731 and 733 grades provide different performance characteristics. The higher-purity 733 grade contains more long-chain fatty acids and provides stronger collecting ability, while standard 731 offers improved selectivity for complex ore systems.
Physicochemical Properties
Oxidized Paraffin Soap is a complex mixture of sodium salts derived from oxidized paraffin wax fatty acids. It provides water solubility, stable flotation performance and flexible application through different grades.
Specifications
| Property | Value |
|---|---|
| Chemical Name | Oxidized Paraffin Soap (Sodium Salts of Oxidized Paraffin Wax Fatty Acids) |
| CAS Number | Not applicable (complex mixture) |
| Appearance | Dark brown to red-brown pasty or powdered solid |
| Active Content (Carboxylic Acid) | ≥ 35% |
| Hydroxy Acid Content | ≤ 15% |
| Unsaponifiables | ≤ 15% |
| Free Alkali (as NaOH) | ≤ 1.0% |
| Moisture | ≤ 30% |
| Solubility | Soluble in water |
| Grades | 731 (standard); 733 (purified, higher fatty acid content) |
Storage & Handling
Store Oxidized Paraffin Soap in tightly sealed containers in a cool, dry and well-ventilated warehouse. Protect the product from moisture and direct sunlight.
The product is hygroscopic; containers should remain sealed when not in use to prevent moisture absorption and quality changes.
During handling, use appropriate personal protective equipment including chemical-resistant gloves and goggles. Avoid skin contact and ingestion. Spilled material should be collected mechanically and disposed of according to local environmental regulations.
Under recommended storage conditions, the standard shelf life is ≥12 months.
Advantages / Limitations
Advantages
Excellent collecting performance for tungsten, fluorite and iron ore flotation.
Natural frothing properties can reduce additional frother requirements.
731 room-temperature flotation method supports energy-efficient tungsten processing.
731/733 dual-grade system provides formulation flexibility.
Non-toxic and cost-effective compared with alternative fatty acid collectors.
Effective performance in alkaline circuits with sodium silicate depressant systems.
Limitations
Not suitable for sulfide mineral flotation.
Selectivity may be limited in complex fluorite-barite or high-calcium tungsten circuits without reagent combinations.
Performance can be affected by water hardness and pulp temperature.
Complex mixture composition may result in batch variation.
Standard 731 grade may require higher dosage compared with purified alternatives.
Summary
Oxidized Paraffin Soap (731 / 733 Flotation Agent) is a proven collector for oxidized mineral flotation, with tungsten beneficiation representing its most established industrial application.
From the traditional 731 room-temperature flotation process to modern high-calcium scheelite circuits achieving high recovery performance, the reagent continues to provide practical value in global mineral processing operations.
Available in both 731 and 733 grades, Oxidized Paraffin Soap enables flexible reagent selection for tungsten, fluorite, iron and other oxidized mineral systems, combining reliable flotation performance with competitive processing economics.
Oxidized Paraffin Soap – FAQ
Q1. Which oxidized ores and salt-type minerals are most suitable for Oxidized Paraffin Soap flotation?
Oxidized Paraffin Soap is a fatty acid-based collector mainly used in the flotation of oxidized minerals and salt-type minerals, including fluorite, scheelite, phosphate, carbonate minerals, and certain oxide ores. It is typically applied where surface chemistry modification is required to improve mineral hydrophobicity and flotation response. The performance of Oxidized Paraffin Soap depends on mineral composition, surface properties, particle size, pulp pH, and water chemistry. Different mineral systems may require specific activators, depressants, or dispersants. Laboratory flotation testing is recommended to determine suitable dosage and reagent combinations before industrial application.
Q2. How does Oxidized Paraffin Soap perform in fluorite flotation?
Oxidized Paraffin Soap can be evaluated as a collector for fluorite flotation due to its ability to interact with calcium-bearing mineral surfaces. In fluorite processing, collector selection focuses on achieving sufficient fluorite recovery while controlling the flotation of gangue minerals such as calcite and dolomite. The flotation performance depends on pulp pH, water hardness, mineral liberation, and the use of depressants. Oxidized Paraffin Soap is often tested together with modifiers such as sodium silicate or other regulators to improve selectivity. Laboratory flotation tests are recommended to optimize reagent dosage and establish suitable operating conditions for specific fluorite ores.
Q3. Can Oxidized Paraffin Soap improve recovery in rare earth associated mineral flotation?
Oxidized Paraffin Soap may be evaluated in rare earth associated mineral flotation where valuable minerals require fatty acid-type collectors for surface adsorption. Its application depends on the mineral composition, such as bastnaesite, monazite, or other rare earth-bearing phases, as well as associated gangue minerals. In complex rare earth ore systems, selective flotation usually requires a combination of collectors, depressants, and pH modifiers. Oxidized Paraffin Soap should be assessed through mineralogical analysis and laboratory flotation testing to determine whether it can improve recovery and maintain concentrate quality under specific processing conditions.
Q4. How does Oxidized Paraffin Soap compare with conventional fatty acid collectors for oxide copper flotation?
Oxidized Paraffin Soap and conventional fatty acid collectors both rely on surface interaction between carboxyl groups and mineral surfaces, but their performance may differ due to chemical composition, chain structure, and oxidation characteristics. In oxide copper flotation, collector selection depends on copper mineral type, gangue composition, activation conditions, and pulp chemistry. Oxidized Paraffin Soap may be considered when a suitable balance between collecting ability and selectivity is required. The actual flotation response should be verified through laboratory testing, including evaluation of recovery, concentrate grade, reagent consumption, and compatibility with other flotation reagents used in the process.
Q5. Is Oxidized Paraffin Soap suitable for tungsten ore flotation?
Oxidized Paraffin Soap can be evaluated in tungsten ore flotation, especially for calcium-containing tungsten minerals such as scheelite. In scheelite flotation circuits, fatty acid-type collectors are commonly considered due to their interaction with calcium sites on mineral surfaces. The effectiveness of Oxidized Paraffin Soap depends on scheelite liberation, gangue mineral composition, pulp pH, and the selection of depressants for carbonate and silicate minerals. A suitable reagent scheme may include modifiers and selective depressants. Laboratory flotation testing is recommended to determine whether Oxidized Paraffin Soap can provide acceptable tungsten recovery and concentrate quality for specific ore conditions.
Q6. How does high calcium and magnesium gangue content affect Oxidized Paraffin Soap flotation performance?
High calcium and magnesium gangue minerals, such as calcite and dolomite, may affect Oxidized Paraffin Soap flotation performance because they can consume collector and reduce selectivity between valuable minerals and gangue. In these ore systems, proper pulp conditioning, selective depressants, dispersants, and pH control are important factors for improving flotation performance. Water hardness and dissolved ions may also influence collector adsorption. The required reagent dosage and process conditions should be optimized through laboratory flotation testing to achieve an appropriate balance between mineral recovery, concentrate purity, and reagent consumption.
Q7. Is Oxidized Paraffin Soap suitable for lithium mineral flotation such as lepidolite or spodumene?
Oxidized Paraffin Soap may be considered for lithium mineral flotation applications depending on the mineral type and processing flowsheet. Fatty acid collectors are commonly evaluated for certain oxide and silicate mineral flotation systems where surface activation and selective adsorption are required. For lithium minerals such as spodumene or lepidolite, flotation performance depends on mineral liberation, surface modification, pH conditions, and the presence of gangue minerals including quartz and feldspar. Laboratory flotation testing is necessary to evaluate whether Oxidized Paraffin Soap can provide suitable lithium recovery and concentrate quality under specific ore characteristics.
Q8. How does Oxidized Paraffin Soap perform in high clay content or high hardness water conditions?
High clay content and high hardness water conditions may influence Oxidized Paraffin Soap performance by increasing reagent consumption and affecting mineral surface interaction. Clay minerals can cause slime coating, while calcium and magnesium ions in hard water may interact with fatty acid collectors and reduce effective adsorption. In such conditions, process adjustments such as desliming, water chemistry control, dispersant addition, and optimized conditioning time may be required. Laboratory testing under representative water and slurry conditions is recommended to determine suitable Oxidized Paraffin Soap dosage and supporting reagent combinations.
Q9. What flotation stage is most suitable for adding Oxidized Paraffin Soap?
Oxidized Paraffin Soap can be applied in rougher, scavenger, or cleaner flotation stages depending on the mineral processing objective and ore characteristics. In rougher flotation, it is commonly evaluated for improving recovery of valuable oxide or salt-type minerals, while in cleaner circuits it may be adjusted to improve concentrate quality and selectivity. The optimal addition point depends on mineral surface conditions, pulp preparation, reagent interaction time, and existing flowsheet design. Laboratory and pilot-scale testing are recommended to determine the most effective addition location, dosage, and conditioning sequence for industrial operation.
Q10. What factors should be considered when applying Oxidized Paraffin Soap in overseas mining projects?
For overseas mining projects, the application of Oxidized Paraffin Soap should be evaluated according to ore mineralogy, water quality, climate conditions, and flotation process design. Factors including pulp pH, hardness of process water, mineral liberation size, reagent compatibility, and local operating conditions may influence flotation results. Oxidized Paraffin Soap can be considered for fluorite, tungsten, phosphate, carbonate, and other oxide or salt-type mineral flotation applications where fatty acid collectors are required. Laboratory testing and process trials under site-specific conditions are recommended to ensure stable flotation performance and reliable technical implementation.