Research On Iron And Vanadium-titanium Separation Of Vanadium-titanium Magnetite By Method Of Solid-state Reduction

The Panzhihua vanadium-titanium magnetite is a kind of composite ore, including iron, vanadium, titanium and many kinds of elements, which has a very high value in use. The existing process to deal with vanadium-titanium magnetite had a low utilization rate of vanadium and titanium. An effective way to achieve comprehensive utilization of vanadium-titanium magnetite is necessary.Panzhihua vanadium-titanium magnetite were used as the main raw materials of direct reduction, and matched with certain proportion of the additives and anthracite, to study the solid-state reduction process. After being reduced, iron, vanadium and titanium were separated from the reduced product by magnetic separation and ferric chloride leaching method, respectively. The solid-state reduction process was a new and effective way to utilize vanadium-titanium magnetite, not only lowed the reducing temperature, also canceled the process of arc furnace melting, reduced energy consumption. This method was a resource and energy efficiently used way.The main conclusions were showed as follows:(1) Vanadium-titanium magnetite after rod milling, screening, and gravity separation, realized the separation of silicon. The total iron content achieved 52.19% from 47.25%, and silicon declined from 20.88% to 8.7%.(2) The vanadium-titanium magnetite was roasted by solid-state reduction process to investigate the influence of reduction temperature, constant temperature time, anthracite and additive on the metallic iron content and the metallization rate. The optimal reaction conditions were as follows:reduction temperature 1100?, constant temperature time 2 hours, anthracite content 13%, addition of CaCO3 3%, addition of CaF2 0.3%, nitrogen flow rate 2L/min. And the metallization rate reached 84%, with total Fe 61.10%, metal Fe 51.39% contained.(3) The direct reduction clinker was treated by magnetic separation. The optimal conditions were:field strength 200mT, particle size 48?m. Total Fe 64.11%, recovery rate 76.99% in the enriched concentrate; total V2O5 2.386%, recovery rate 67.36% in the tailings; TiO2 contents 40.29%, recovery rate 40.29%.(4) The direct reduction clinker was used as raw material in the process of ferric chloride leaching. Fe, V and Ti components were separated from the reducing clinker. Leaching temperature and time, liquid-solid ratio and ferric density were considered in the experiment. And the optimal conditions were:Leaching temperature 70?, and leaching time 30min, liquid-solid ratio of 6:land ferric density 500g/L, the contents of Fe, TiO2 and V2O5 were 13.18%,34% and 2.23% in the tailings.The study indicates that this process get high metallization rate of iron concentrate under low reduction temperature conditions, which is a feasible way of comprehensive utilization of vanadium-titanium magnetite.