铜钼浮选分离中硫化钠的消耗机理

针对铜钼浮选分离生产过程中，往往存在着硫化钠抑制剂消耗量过大、生产成本过高的现象，使用硫离子选择电极动态监测不同条件下硫化钠溶液中硫离子电位，来初步研究硫化钠大量消耗的机理.结果表明:铜钼浮选分离过程中，空气的鼓入和矿浆的未加温处理会增加硫化钠的氧化消耗，是硫化钠消耗量大的原因之一.浮选矿浆中的矿物(如辉钼矿、黄铜矿和黄铁矿)有着催化硫化钠氧化分解的作用，加上矿物本身对硫化钠的吸附作用，是造成铜钼浮选分离过程中硫化钠大量消耗的又一原因.此外，矿浆中溶出的少量金属阳离子(如Cu²⁺和Fe³⁺)对硫化钠的氧化分解也有一定作用，进一步加剧了硫化钠的消耗.

Consumption Mechanism of Sodium Sulfide in Flotation Separation of Copper and Molybdenum

In the production process of copper-molybdenum flotation separation， the consumption of sodium sulfide inhibitors is always high. The high consumption of sodium sulfide dramatically increases the production cost of copper-molybdenum flotation separation. The mechanism of large consumption for sodium sulfide was preliminary studied in copper-molybdenum flotation separation. Under the different experiment conditions， dynamic monitoring approach was used to quickly measure the change of sulfide ion concentration in sodium sulfide solution by sulfide ionic selective electrode. The results showed that the oxidation of sodium sulfide can be catalyzed by flotation mineral(molybdenite， chalcopyrite and pyrite)and metal cation(Cu²⁺ and Fe³⁺)from flotation pulp. Moreover， the blowing air to flotation pulp and lower pulp temperature can also accelerate the oxidation consumption of sodium sulfide in flotation process.As a result， the large consumption of sodium sulfide is caused by catalysis action from mineral and metal cation， adsorptive action of mineral， the effect of flotation pulp temperature and blowing air to flotation pulp.