Dachang mining polymetallic sulfide ore flotation and bio-leaching of iron sphalerite

　　Title: Dachang mining polymetallic sulfide ore flotation and bio-leaching of iron sphalerite
　　Author: Chen Jianming
　　Degree-granting units: Central South University
　　Keywords: sulfide;; flotation;; bacterial leaching;; Marmatite
　　Abstract:
　　In this paper, China Dachang cassiterite mine - lead-antimony zinc polymetallic sulfide ore flotation and bacterial leaching, and metal extraction of a systematic study. The ore jamesonite, iron sphalerite, pyrrhotite as the main object of study, study their agents in different conditions of flotation behavior of bacterial leaching behavior, in this based on the flotation http://www.chinamagnets.biz/ process structure design, and the use of flotation and bioleaching joint lead-antimony Process polymetallic sulfide ore of zinc, iron, zinc ore from the fluid in bacterial leaching of zinc separation and enrichment.
　　Identified jamesonite, iron sphalerite, pyrrhotite three mineral flotation behavior jamesonite in a broad pH range (2-11) are well within the floatability, more butyl xanthate, black drug butylamine, SN-9 three collector found that the butylamine black drug collector is better than the other two; iron sphalerite in the pH range 3-7 with good floatability, when the pH value is greater than 8, since iron is difficult to float sphalerite; natural pyrrhotite floatability of poor in the pH 4.5-6 range pyrrhotite have some may be floating, but when the slurry pH greater than 8 after it difficult conditions in the absence of activator float.
　　Jamesonite can not bacterial leaching, bacterial leaching of the existing jamesonite oxidation is not obvious. Pyrrhotite can be bacterial leaching, but also as a medium for bacterial leaching. Choose the right strain, iron can be bacterial leaching of sphalerite. 92 mineral ore mining giant shake flask bioleaching of zinc can be, but filtration column leaching is not feasible, the difficulty is that the former must spend a lot of sulfuric acid leaching, and percolation leaching process of pillar poor leachate is easy to short circuit. Flotation can be bacterial leaching of zinc concentrate, biomass, pulp density, flotation agents on the bacterial leaching of zinc concentrate flotation of zinc affect the rate.
　　The results are as follows, namely, first through the flotation of lead (antimony) and zinc (S) separation, to obtain lead and zinc crude ore concentrate; again for bacterial leaching of zinc concentrate, the zinc, sulfur separation, obtained with zinc leaching solution. The entire process, lead antimony recoveries were more than 80%, respectively, 80.11%, 80.04%; zinc recovery was 90.8%; and pure approach to the use of No. 92 ore flotation, the entire process, the recovery of lead-antimony rates were 80.11%, 80.04%; zinc recovery was 83.46%. Therefore, in principle, lead, zinc antimony polymetallic sulfide ore flotation separation combined with bacterial leaching process is feasible.
　　Theoretical studies have shown that giant iron mine sphalerite is Fe mixed with sphalerite, rather than isomorphism, ZnS and FeS crystal structure is similar but Rare earth magnets belong to different crystal as the miscibility between this lattice structure in the bacterial under more easily damaged, so the mining giant's iron sphalerite vulnerable to bacterial erosion. Bacterial leaching of iron in sphalerite, zinc iron is leaching priority. As the Fe into the sphalerite position in which the octahedral positions of Zn than the tetrahedral crystal field with more stable energy, Zn-S bond Fe-S bond than the first destroyed, Zn2 + ions start sphalerite lattice is released, Fe compounds in the form of places FeS leaching slag. Flotation agents on the inhibition of bacteria of different sizes because they are toxic to the bacteria is different from them in certain molecular groups (ethyl xanthate xanthate, butylamine black drug ammonium) in acidic solution Some of the bacteria in certain membrane enzymes and toxic proteins, xanthan has a strong corrosive acid on the toxic protein). Electrochemical tests show that the presence of bacteria, the iron sphalerite dissolution rate increases, and the electrode surface passivation effect of weakening, the reason is the activity of bacterial oxidation of elemental sulfur to promote and improve the iron sphalerite electrode conductivity.
　　Degree Year: 2010