Microwave Heating Vanadium-titanium Magnetite Concentrate New Technology Research, Preparation Of The Natural Micro-alloy Iron

Powder metallurgy technology characteristic and development in Iron powder present preparation technology and produce home and broad were described in this paper. Owing to the first reduction time being long during the preparation of iron power by solid coal reduction, a novel process of the preparation of nature microallyed-iron power by composited palletizing joined iron-grain growth and speed carbon-gasification novel additives by means of the microwave irradiation heating reduction was put forward. The main experiment and results were as follows:Experiments of preparation of palletizing were carried out. The results of experiment indicated that preparation of composited palletizing by soluble glass as binder was practical. The preparation conditions were obtained as follows:the ratio of soluble glass dosage to V-Ti magnetite concentrate:8%, diameter of composited palletizing:15mm around, drying temperature:150℃and drying time 35min.The experiments of the first reduction were researched in detail. The conditions of reduction V-Ti magnetite concentrate by microwave irradiation heating were obtained as follows:reducing agent being coal, the ratio of mass of coal-containing to V-Ti magnetite concentrate being 15%, the ratio of mass of coal-outside to V-Ti magnetite concentrate being 40%, reductive temperature being 1200-1250℃, reductive time being 90min, material granularity of 75μm occupying 80%, the ratio of mass of additives to V-Ti magnetite concentrate being 5%, the ratio of mass of additives to V-Ti magnetite concentrate being 3%.The experiments of composited palletizing after the first reduction progress grind-select were completed and the reasonable conditions were determined as follows: operation parameter of the first grind-separation being-75μm occupying 65%, operation parameter of the second grind-separation being-75μm account up 55% and 2000 Oe of magnetic separation. The experiments of conventional heating of the second H2 reduction were carried out and the reduction conditions were as follows: 6L/min of H2 mass flux distribution,820℃of reductive temperature and 80min of reductive time.The preducts of iron power were characterized by means of EMPT—1600 and XRF, respectively. The results of EMPA—1600 indicated that Iron powder grain was loose and porous with brain shape sponge wide fork structure and its surface was more than rough and specific surface more higher. The XRF of analysis show that the purity of iron power was high. It has tittleTi,V,Cr,Mn,Ni,Cu,W,Ga,Rh etc metal.Owing to tailing of after grind-separation containing a certain Ti and to make comprehensive use of tailing, the experiments of leaching tailing with acid were carried out in order to improve Ti content in the tailing. The experimental conditions were as follows:H2SO4 concentration 20%, leaching temperature 90℃, leaching time 120min. The leached residues were filtrated and washed. Ti content in the leached residues reached 50.05%. It broke a new path for comprehensive use of tailing.Conventional heating experiments were carried out in order to explain microwave irradiation heating which can shorten reduction time of the first reduction or not. The first reduction conditions of conventional heating were similar to the conditions of microwave heating. The results of experiment show that the high reduction effect of the conventional heating needed 180min whereas needed 90min reductive by microwave heating. Therefore, reductive time was shorten half by microwave heating compared with conventional heating, which further account for microwave heating could distinctly improve the rate of coal reduction of metal oxide.