Desulfurization Of High Sulfur Iron Ore Beneficiation Technology

Aimed at pyrrhotite high sulfur iron ore is difficult to desulfurization，so that iron oreconcentrate of inferior quality and cannot be sold，the urgent need to develop a efficient newtechnology or new methods of desulfurization in an sulfur iron ore to get qualified ironconcentrate.The paper carried out the desulfurization technology in high sulfur iron ore by singlemineral tests,mineralogical properties of actual ore process research,the actual ore magneticseparation and flotation process test, contact angle measurements and infrared spectra tests.In the single mineral tests, the effects of its natural floatability difference from grain size ofmonoclinic pyrrhotite and hexagonal pyrrhotite; studied monoclinic pyrrhotite and hexagonalpyrrhotite flotation effect by pulp pH and under the conditions of different collector type in noactivators and H₂SO₄, NH₄HCO₃and JL-02three activator systems; studied the actual ores test ofthe artificial hybrid simulation by monoclinic pyrrhotite, hexagonal pyrrhotite and magnetite;studied the magnetic strength of monoclinic pyrrhotite, hexagonal pyrrhotite and magnetite.Drawed the conlusion as follows：Different crystal structure of pyrrhotite natural flotabilityobvious differences, the monoclinic pyrrhotite natural floatability is stronger than the thehexagonal pyrrhotite natural flotability;The activator JL-02and the collector Q-319owned betterresults on the activation and collector of pyrrhotite;Magnetite magnetic＞monoclinic pyrrhotitemagnetic＞hexagonal pyrrhotite magnetic.Actual raw ore separation desulfurization by view of the basis of pure mineral experimentalstudy and BaYannaoer of Western mining high sulfur iron ore process mineralogy research. Bythe four process test of “stage grinding-the stage of sorting”,“firing”,“floating-magnetic–floating”joint technology and “magnetic–floating–magnetic”joint technology gone explorationand condition tests. Drawed “magnetic-floating–magnetic” process can get the ideal index andcontrol coarse ground degrees the-0.074mm accounted65%,under the conditions of the magnetica160mt strength of magnetic separation, the election of the other magnetic products byregrinding reached-0.045mm90%, adding90ml/kg dilute sulfuric acid （concentration10%）asactivating agent, butyl xanthate+Q-319（40g/t+20g/t） as collector anti-flotationdesulfurization, flotation products repeatedly featured,middle minerals followed by sequential inreturn, the tailings product magnetic separation under the conditions of the magnetic intensity160mt, two different in middle minerals to return to the closed-circuit test,then respectively irongrade63.18%, sulfur grade0.62%, iron recovery rate52.78%were obtained and ron grade63.29%, sulfur grade0.58%, iron recovery rate51.74%were obtained.From the results of contact angle and the infrared spectra can be seen, hydrophobic groupscollecting agent Q-319had strong adsorption with monoclinic and hexagonal pyrrhotite surface.Magnetic-floating-magnetic "craft a feasibility analysis, and to explore the larger cause acidconsumption.