Do you know the most important sulfide ore collectors?
Sulphide ore collector:
The characteristic of this type of collector is that there is usually a solid group composed of divalent sulfur atoms inside the molecule, and at the same time, the molecular weight of the hydrophobic group is small, so it can collect sulfide minerals, but has no collection effect on gangue minerals such as quartz and calcite. Its main representatives are xanthate, black medicine, carbamate, thiol, thiourea, and their corresponding esters.
Xanthate (sodium xanthate) is an anionic collector with good collection performance. Xanthogenic acid is a weak acid, easy to decompose, the lower the pH value, the faster the decomposition; xanthate is easy to decompose when heated, and the higher the temperature, the faster the decomposition; xanthate itself is a reducing agent, easy to be oxidized.
Xanthate is the most commonly used collector for flotation of sulfide minerals (such as chalcopyrite, galena, sphalerite, etc.). Xanthate ions can form insoluble compounds with many heavy metals and noble metal ions.
Black medicine (Dialkyl dithiophosphate) is also a main collector of sulfide ore. The flotation properties of black medicine and xanthate are similar, but the collection ability of black medicine is weaker than that of xanthate. But the selectivity is better; the black medicine has poor collection of pyrite and has foaming performance; the black medicine is mostly used for flotation of pyrite-containing copper sulfide ore, lead-zinc and copper-zinc and other polymetallic ores. Generally, 25-100g/t of the drug should be used, since it has foaming properties.
The content of ethyl dithiazide (aminodithioformate) is more than 95%, and it is a compound formed by the reaction of diethylamine (or dibutylamine) with carbon disulfide and sodium hydroxide. Ethiazide is a white powder, because a small amount of xanthate is produced during the reaction, and the industrial product is often light yellow. Soluble in water, easy to decompose in acidic medium. Ethiazide can also form with heavy metals and cannot be precipitated, and its collection capacity is stronger than that of xanthate. It has a strong ability to collect galena and chalcopyrite, but has a weak ability to collect pyrite. It has good selectivity, fast flotation speed, and less dosage than xanthate. harvestability. When it is used in the separation of copper-lead sulfide ore, it can obtain better separation effect than xanthate.
Activated sphalerite, chalcopyrite, and chalcocite are good collectors of sulfide ore, but thiamine is a great collector of sulfide ore. It does not float pyrite, and is a selective collector for sorting copper, lead, zinc and other sulfide ores, which can reduce the amount of lime used to suppress pyrite.
Yellow powder, insoluble in water, soluble in alcohol, sodium hydroxide and sodium carbonate solutions, and its sodium salt is Kapnex, soluble in water, are mercaptans (benzothiazole thiol). The collection of lead oxide ore is strong. During the flotation of sulfide ores, the collection ability of galena is the strongest, the collection ability of sphalerite is poor, and the collection ability of chalcopyrite is the weakest.
As a white solid powder, imidazole thiol is barely soluble in water, but better soluble in alkali (sodium hydroxide, sodium sulfide, etc.). In the flotation of copper oxide ores (mostly copper silicate and copper carbonate) and refractory copper oxide ores, it is widely used.
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