| Copper, as one of the most important non-ferrous metals to China's national economy, is widely used in military industry, electricity, telecommunications, transportation, light industry, construction, machinery and other industries. Along with the fast development and propulsion of our country's industrialization and informatization, the copper's consumer demand inflates suddenly. In China's proven copper resources, there exists a large number of low-grade refractory copper oxide ores and lead-zinc oxide ores. Many overseas copper mining's mining grade has fallen to 0.4 percent. A large amount of low-grade refractory copper oxide deposits are mainly distributed in such provinces as Yunnan, Hubei, Guangdong, Xinjiang, Inner Mongolia, Sichuan and Heilongjiang etc.. Tangdan copper deposit in Yunnan province is a copper oxide deposit whose reserves is the largest in the proven reserves of copper oxide so far in China. Its recoverable deposits are about 1,000,000 tons, while the average geological grade is 0.88%. These belong to the refractory oxide copper oxide ore which are difficult to dress. As its great difficulty of dressing and poor dressing indicators, there is an urgent need to study more effective flotation processes and flotation methods of oxide ore.Activation sulfide flotation is the main recycling method of such resources. As a chemical agent widespread applied in mineral processing, metallurgy and chemical industry, sodium sulfide can be used as copper-molybdenum flotation separation of chalcopyrite depressant, non-ferrous metal oxide activator, wastewater treatment the ion precipitation agent due to its reducing. Especially in the process of beneficiation and metallurgy of lead and zinc in the copper oxide ore, its special chemical properties of the activation of non-ferrous metal oxide ores plays a very vital role. But there exists some problems of the oxidation of sodium sulfide ore flotation activated, which often make sodium sulfide can not be fully used. Following are these problems:First, the timeliness of activated sodium sulfide, namely the activation time of sodium sulfide are different in different sodium sulfide flotation system, range from several minutes to several dozens minutes, which can largely affect the adding and action effect of other agents;Second, the amount of sodium sulfide in sulfide and activation process, the amount consumption of sodium is from a few hundred grams per ton to more than ten kilograms per ton to raw ore, going far beyond its chemical equivalent, which is essential to effective activation of oxide ores and flotation indicators.Third, the impact of sludge is more complex in the flotation system, being the primary factor for the oxidized ore's difficulty to carry on flotation process, playing an important role in affecting the mechanism of sulfide and activation, the consumption of reagent and the action mechanism.According to the above problems existing in the process of oxidation of sodium sulfide ore activation, the paper carried on experiment study on the changing situation of the concentration of S2- in the mineral slurry system during the process of function between sodium sulfide and mineral.Paper on malachite, chalcopyrite, galena, arsenopyrite, pyrite, quartz, calcite and sulfide minerals role of pure pulp system S2-concentration has been studied, studies show that the exclusion of hydrolysis reaction of sodium sulfide, and the possibility of adsorption, it can be concluded that copper oxide (malachite), chalcopyrite, galena, pyrite catalyze oxidation on the S2-. |
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