Process For Solid-state Reduction And Magnetic Separation Of High Iron Content Manganese Ore And Its Strengthening Technology

Abstract:Manganese ore resources are rich in China, the constitution of the ore is very complex and more than73%of manganese ore contains iron. All of these lead to a result that the traditional separation methods produced poor effect. The process in which anthracite coal was the reducing agent for coal-based direct reduction and magnetic separation of the ore, the interaction effect of iron oxide and manganese oxide during the reduction process, as well as the strengthening technology of the process were also studied. Here are the main creative points and conclusions:(1) Mineralogy analysis shows that granular hematite and a small amount of limonite (1～2um) distributed unevenly in laminar bixbyite and49.53%of manganese existed in iron mineral isomorphously.(2) The researches of ferruginous manganese briquette indicated that the percent of manganese metal in iron phase increased with the increase of temperature, and iron metal could be found partially in manganese phase, which hindered the further separation of manganese and iron. Borax enhanced the effect of Mn-Fe separation, because they could promote the migration of iron and manganese, reduced the percent of manganese in iron phase and the percent of iron in manganese phase, thus promoting the growth of iron and manganese phases.(3) High-iron manganese briquette is roasted, grinded and separated by magnetic separation in turn, magnetic products with68.55%total iron grade,96.03%iron recovery and non-magnetic products with59.70%total manganese grade,79.29%manganese recovery are obtained under the conditions that reduction temperatures was1100℃,reduction time was100min. Under the conditions of borax dosage were4%, iron and manganese were able to be deeply separated. The iron grade and manganese grade of magnetic products was81.93%and11.22%respectively.