Two sample groups of bulk concentrates consisting mainly of pyrite andchalcopyrite from Daye and Chenghchao Mines in Hubei Province of China were used to investigate theeffect of the action time of lime on its depress...Two sample groups of bulk concentrates consisting mainly of pyrite andchalcopyrite from Daye and Chenghchao Mines in Hubei Province of China were used to investigate theeffect of the action time of lime on its depressive ability for pyrite. The experimental resultsconducted with different samples and collectors showed that the action time between lime and pyritemarkedly influences the depressive ability of lime. The depressive ability of lime increased withthe action time increasing. It was also proved that the depressive results obtained at a large limedosage after a shorter action time are similar to those obtained at a small lime dosage after alonger action time. The increase of depressive ability of lime after a longer action time is becausethat there are different mechanisms in different action time. The composition on the surface ofpyrite acted for different time with lime was studied by using ESCA (Electron Spectroscopic ChemicalAnalysis). The results showed that iron hydroxide and calcium sulphate formed on the pyrite surfaceat the presence of lime in the pulp but the amounts of iron hydroxide and calcium sulphate weredifferent at different action time. At the beginning action time the compound formed on the pyritesurface was mainly calcium sulphate and almost no iron hydroxide formed; but with the action timeincreasing, iron hydroxide formed. The longer the action time, the more iron hydroxide and the lesscalcium sulphate formed. It was considered that the stronger depressive ability of lime after alonger action time is because more iron hydroxide forms on the pyrite surface.展开更多
文摘Two sample groups of bulk concentrates consisting mainly of pyrite andchalcopyrite from Daye and Chenghchao Mines in Hubei Province of China were used to investigate theeffect of the action time of lime on its depressive ability for pyrite. The experimental resultsconducted with different samples and collectors showed that the action time between lime and pyritemarkedly influences the depressive ability of lime. The depressive ability of lime increased withthe action time increasing. It was also proved that the depressive results obtained at a large limedosage after a shorter action time are similar to those obtained at a small lime dosage after alonger action time. The increase of depressive ability of lime after a longer action time is becausethat there are different mechanisms in different action time. The composition on the surface ofpyrite acted for different time with lime was studied by using ESCA (Electron Spectroscopic ChemicalAnalysis). The results showed that iron hydroxide and calcium sulphate formed on the pyrite surfaceat the presence of lime in the pulp but the amounts of iron hydroxide and calcium sulphate weredifferent at different action time. At the beginning action time the compound formed on the pyritesurface was mainly calcium sulphate and almost no iron hydroxide formed; but with the action timeincreasing, iron hydroxide formed. The longer the action time, the more iron hydroxide and the lesscalcium sulphate formed. It was considered that the stronger depressive ability of lime after alonger action time is because more iron hydroxide forms on the pyrite surface.
