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Sodium diisobutyldithiophosphate (also known as sodium diisobutyl dithiophosphate; CAS No.: 53378-51-1; molecular formula: (C4H9O)2P(S)SNa) belongs to the dithiophosphate class of flotation reagents (the "aerofloat" or "black reagent" series). Synthesized from phosphorus pentasulfide, isobutanol, and sodium hydroxide, it serves as a selective collector for sulfide ore flotation and possesses mild frothing properties. It exhibits weak collecting power for pyrite under alkaline conditions, making it suitable for the differential flotation of polymetallic sulfide ores; compared to xanthates, it offers superior selectivity and is a highly efficient collector widely used in the flotation of non-ferrous and precious metal sulfide ores.
1. Chemical Stability: It is highly stable in neutral or weakly alkaline pulp and exhibits better heat resistance than xanthates. However, under strongly acidic conditions (pH < 5), it readily undergoes hydrolysis and decomposition, releasing toxic hydrogen sulfide gas and forming sparingly soluble dithiophosphoric acid.
2. Collection Mechanism: It dissociates in water to yield diisobutyl dithiophosphate anions, which undergo chemisorption with metal ions such as gold, silver, copper, and zinc. This forms sparingly soluble complexes that adhere to the mineral surface, rendering it hydrophobic and allowing it to float. It demonstrates superior collecting power for gold and silver compared to xanthates.
3. Metal Salt Precipitation: Its aqueous sodium salt solution rapidly forms sparingly soluble precipitates upon contact with heavy metal ions; this property serves as the theoretical basis for activating or depressing specific minerals during flotation.
4. Oxidation and Decomposition Characteristics: Oxidation proceeds slowly at ambient temperatures, but exposure to strong oxidizing agents (such as potassium permanganate) causes oxidation into disulfides, resulting in a loss of activity. It should not be stored with acids or strong oxidizing agents; furthermore, prolonged exposure to heat (>60°C) or light causes partial decomposition and the formation of precipitates.
Incompatibilities: Strict prohibition against storage or contact with strong oxidizing agents, strong acids, or strong bases.
Core Application: (Non-ferrous and precious metal ores) Specifically designed for the flotation of sulfide ores containing gold, silver, copper, and zinc. It demonstrates strong collecting power for these valuable metals—particularly in alkaline pulp—while effectively inhibiting pyrite. This significantly boosts concentrate grade, making it highly suitable for processing complex polymetallic ores.
1. Copper Ore Flotation (Primary Use Case): Flotation of chalcopyrite and bornite; copper-sulfur separation (inhibiting pyrite to raise copper concentrate grade); and separation of copper-molybdenum mixed ores (often used in combination with thionocarbamates).
2. Gold and Silver (Precious Metal) Flotation: Recovery of gold and silver associated with sulfide ores, including gold/silver encapsulated within the ore matrix; suitable for gold-bearing sulfide ores to enhance the overall recovery rate of gold and silver; widely used in the gold mining industry.
3. Lead-Zinc Polymetallic Sulfide Ores: Facilitates preferential flotation of lead and zinc, separating lead and zinc sulfides from pyrite impurities to achieve polymetallic separation and purification.
4. Other Sulfide Ores (Nickel, Molybdenum, etc.): Used as an auxiliary collector alongside other reagents for complex polymetallic associated ores.
Special Advantages: (Silver and Gold Collection) Exhibits exceptional collecting capability for silver in gold and silver flotation, often serving as a key collector; also demonstrates good selectivity for unoxidized primary gold ores.
Auxiliary Characteristics: (Frothing and Formulation) Possesses inherent weak frothing properties, allowing for reduced dosage of additional frothing agents. In industrial practice, it is frequently combined with xanthates (such as sodium isobutyl xanthate), leveraging the synergistic effect of "dithiophosphate collecting precious metals + xanthate collecting copper/sulfur" to improve overall recovery rates.
1. Environmental requirements: Must be stored in a cool, dry, and well-ventilated area; strictly protect against moisture, water, and exposure to direct sunlight. 2. Fire and heat prevention: The storage area must be kept away from sources of ignition and high-temperature objects; smoking and open flames are strictly prohibited. 3. Containers and shelf life: Typically packaged in 200 kg plastic drums or IBCs; shelf life is 24 months.
1. Dangerous Goods Declaration: Classified as a Class 8 corrosive liquid; for export by sea, it must be declared in accordance with UN1719 regulations. 2. Packaging Specifications: Measures must be taken during transport to prevent the containers from tipping over, being inverted, or leaking.
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