| The oxidation state of metal waste and tailings by synthetic transforming as synthetic sulfide ore,which is an effective way to improve the separation of metallic minerals and gangue minerals. But those of the synthetic sulfide ore surface hydrophobicity was still up to less than the surface properties of natural sulfide ore.meanwhile has the fine grain size, which is not suitable for direct flotation. Using the Mineral nutrition bacterial in artificial sulfide ore of flocculation and adsorption, which can change the surface hydrophobicity of the artificial sulfide ore and improve its floatability, so as to achieve the purpose of separation and purification of micro-fine synthetic sulfide ore recovery. The new way of recovering resources metal from smelting slag will be provided. This paper selected three kinds of mineral nutrition of bacteria, respectively, Thiobacillus ferro-oxidans, Thiobacillus thio-oxidans and Mycobacterium phlei.For flocculation flotation effect experiment of synthetic sulfide ore using the three kinds of bacteria researched the heavy metals in zinc recovery from slag. And the application of microbial induced mechanism of fine artificial flocculation flotation of sulfide ores has been researched.The main results were as followings:(1) For flocculation flotation experiments of fine particles of zinc sulfide ores with T.f and T.t bacterium mixture of bacteria, the best effect is achieved by recycling rate reached68.64%, Zn grade reached36.7%.(2) Mycobacterium phlei induced fine ore flocculation flotation experiment results show that, Mycobacterium phlei for fine ore flotation separation of valuable metal Zn effect is very good, the best conditions of Mycobacterium phlei induced fine separation by flotation for:pH7, the concentration of bacteria was one hundred million bacteria per milliliter, reaction time1hours the results showed that the samples, the recovery rate reached70.53%, Zn grade to46.9%. (3) The mechanism invastigation of microbial action revealed that, the best equilibrium time through T.f bacteria, T.t bacteria and mixed bacteria adsorption tests may be set for20minutes, and shows that the bacteria has good adsorption effect on the sample surface. Comparison of bacterial cells in the adsorption of sulfide mineral surface results:T.f and T.t mixed bacteria than T.f bacteria, T.f bacteria than T.t bacteria. At the same time through the Zeta potential study shows,is that with the bacterial cells action, surface chemical properties of minerals had some changes. Results showed that the combined with SEM, the formation characteristics of microorganisms adsorbed on the sample surface.(4) Through the adsorption experiments of Mycobacterium phlei in fine particle samples for zinc ore has selective adsorption effect. Combined with the changes of Zeta potential, Mycobacterium phlei is mainly in the fine grained ores of zinc minerals formed the characteristic adsorption. Determination of contact angle can be directly showed that the Mycobacterium phlei increased hydrophobic effect of sample surface adsorption of fine particle samples in specific surface, thus improving the effect of flotation separation. Scanning electron microscope observation resulted that, Mycobacterium phlei is mainly adsorbed on the sulfide minerals containing Zn, forming a selective adsorption effect, meanwhile The data shows that Mycobacterium phlei surface infrared spectroscopy to generate adhesion group some strong hydrophobicity on the surface of zinc sulfide minerals in order to improve the quality of Zn. |
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