Industrial use of cassiterite collectors are mainly fatty acids, citric acid, alkyl hydroxamic acid, alkyl sulfosuccinic acid, phosphonic acid 5, oleic acid, benzyl phthalic acid, A-22, salicylox Acid is a commonly used collector. Oleic acid is the most common collector in fatty acids and is generally used to float a cassiterite- quartz type slime under neutral or alkaline conditions. Aliphatic phosphoric acid collector suitable for free Fe3 + and Pb2 + tin ore flotation, pH optimum value between 2.55-3.50. Tannic acid is divided into aromatic tannic acid and aliphatic tannic acid, which are all effective tin carbide collectors. The aromatic floric acid has better flotation effect in weakly acidic medium. The order of the ability to capture fine cassiterite is: mixed toluic acid > p-toluic acid > benzyl sulphonic acid > o-toluene decanoic acid. In the weakly acidic and neutral pulps, the mixed toluene acid flotation of the cassiterite has the best effect. Use it flotation gold mud containing tin sulfide minerals, to avoid the influence of sludge, desliming be pre-processed, and to avoid the influence of tin sulphide concentrates on the quality, to be pre-desulfurization. Aliphatic tannic acid is a good collector and can react with metal ions such as Sn2+, Sn4+ and Fe3+ to form poorly soluble compounds. Barry ore processing plant for processing cassiterite polymetallic sulfide ore, cassiterite flotation agents are sulfuric acid, arsenic acid benzyl group, P86, sodium carboxymethylcellulose and No. 2 oil. The most commonly used alkyl hydroxamic acid is salicyl hydroxamic acid. In the weakly alkaline medium, TBP has a strong trapping effect when used as an auxiliary collector. The use of salicylic acid and P86 new combination agent instead of tannic acid collector can improve the recovery rate of cassiterite. Sulfonated succinic acid has a better flotation effect on coarse-grained cassiterite and is the most widely used. Adding ethylenediaminetetraacetic acid tetrasodium salt to complex high- iron ions and water glass to disperse fine-grained gangue particles can promote flotation index. Sulfonamide acid has good collection performance for fine-grained cassiterite, low dosage, fast flotation speed, but poor selectivity, and is suitable for use in acidic medium. Similar agents include sulfosuccinic acid (domestic code A-18), A-22, 209 detergent. The phosphonic acid collector phosphonic acid is classified into an aromatic phosphonic acid and an aliphatic phosphonic acid. Alkyl sulfate sodium salt (C12-C20) weaker than tin oleate stone collecting capability, the ability to have a selective collector brass ore, collecting capability weak pyrite selectivity for calcium-containing minerals better. Amine collectors are preferred collectors for sulphur flotation, which include primary amine salts, secondary amine salts, tertiary amine salts, quaternary ammonium salts and alkyl pyridinium salts, of which primary amine salts are widely used.

Although there are many kinds of existing collectors, there are still some problems, such as high cost, polluted environment, and difficult processing of fine-grained grades. Therefore, many new collectors have been developed at home and abroad in recent years, such as ZJ-3, BY. –9, CF, SR, etc. ZJ-3 is a new type of collector successfully studied by Zhu Yimin. The agent is suitable for treating fine cassiterite having a particle size of less than 19 μm. BY–9 is a chelating collector for cassiterite. It is used for the recovery of tin from the cassiterite polymetallic sulphide tailings. By comparing the flotation effects of BY–9, C9 hydroxamic acid and Sun 2#, BY–9 has the best collection effect and the dosage is 1000g/t. An effective promoter P86 of 100 g/t of cassiterite and 50–100 g/t of inhibitor BY–5 and 50 g/t 2# oil were added to finally obtain a concentrate with a grade of 48.76% and a recovery rate of 49.88%. The sillimanite is equivalent to the susceptibility of silicate. When Mengzi Mining & Metallurgy Co., Ltd. handles tailings, BY-9 is used as collector, P86 is auxiliary collector, sodium carbonate and BY-5 are inhibitors ( The main component is lignin), and a tin concentrate with a tin grade of 53.58% and a recovery of 50.12% is obtained. CF is a new type of chelate collector developed by Beijing Research Institute of Mining and Metallurgy. It is suitable for flotation of cassiterite and antimony minerals. Li Quan studied the industrial application of the new agent SR2 for the silliman flotation. Industrial application results prove that the new drug SR2 has a strong ability to capture tin fine mud.

Wang Peipei studied the flotation effect of three alkyl hydroxamic acids (heptyl, octyl, decyl) on cassiterite. It is pointed out that the flotation effect of the three agents increases with the increase of the length of the alkyl carbon chain and the appropriate pH range; the selectivity of octyl hydroxamic acid to cassiterite under neutral and acidic conditions is better. Salicyl hydroxamic acid has good selectivity to cassiterite and is not highly collectible. When combined with hydroxamic acid collector C salicyl hydroxamic acid: C octyl hydroxamic acid = 1:1, the flotation recovery rate of cassiterite is higher. And the difference from the gangue recovery rate is large.

Factors affecting the performance of the collector

When the collector is oleic acid, a small amount of Ca2+ is added to activate the cassiterite. A13+ significantly affects the flotation of cassiterite by sulfosuccinic acid acid collector. When A13+ is used in combination with A-22, para-toluene arsenate and dodecylacetate, A13+ has a certain inhibitory effect on cassiterite. A13+ is added to the para-toluene arsenate at the same time, and when the pH is 2–4, A13+ activates the cassiterite. Fe3+ in the pulp has an inhibitory effect on gangue and cassiterite. With aliphatic phosphonic acid as the collector, Fe3+ has the strongest inhibitory effect on cassiterite at pH<4.5. When FCL is floated with collector A–22, Fe3+ has little effect on A–22 flotation of cassiterite, but as the concentration increases, cassiterite is strongly inhibited. When using aliphatic phosphonic acid as a collector, Pb2+ has a certain activation effect on the flotation of cassiterite. Further, when as collector with CF, Ca2 +, Mg2 +, Cu2 +, Zn2 +, Fe3 +, Sn4 + are disincentive for cassiterite, tantalum and niobium mineral, wherein Cu2 +, Fe3 ten, Sn4 + greater impact. Under the action of alkyl hydroxydecanoic acid combined collector, Wang Peipei investigated the effects of the presence of Ca2+, Mg2+, Pb2+, Fe3+, Fe2+ and Al3+ on the flotation of fine cassiterite. The results showed that metal ions were used for the flotation of cassiterite. The influence is mainly determined by the pH of the slurry, and the concentration of the metal ions also affects the flotation of the cassiterite to a certain extent.

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