Method of directly reducing vanadium-titanium ore hot-pressing blocks in rotary hearth furnace and melting in electric furnace

Abstract

The invention belongs to the technical field of comprehensive utilization of metallurgical resources, and in particular relates to a comprehensive utilization method of directly reducing vanadium-titanium ore hot-pressing blocks in a rotary hearth furnace and melting in an electric furnace. The method comprises the following steps: (1) blending vanadium-titanium ore mineral powder with bituminous coal powder, heating mixed powder and carrying out hot-press molding so as to obtain the vanadium-titanium ore hot-pressing blocks; (2) putting the vanadium-titanium ore hot-pressing blocks into the rotary hearth furnace by covering multiple layers of materials on the vanadium-titanium ore hot-pressing blocks and carrying out direct reduction via thick material layers; (3) melting products obtained by reducing the vanadium-titanium ore hot-pressing blocks in the rotary hearth furnace so as to obtain vanadium-containing molten iron and titanium slag; and (4) carrying out vanadium blowing and steelmaking on the vanadium-containing molten iron so as to obtain vanadium slag and a steel ingot, wherein the vanadium slag can serve as a raw material for preparing titanium dioxide. The method which is used for preparing the vanadium-titanium ore hot-pressing blocks has the advantages of low production cost, high production efficiency, low energy consumption, good quality of the vanadium titanium ore hot-pressing blocks and the like. Thus, the economy of the process of directly reducing vanadium-titanium ores in the rotary hearth furnace and melting in the electric furnace is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of metallurgical resources, and in particular relates to a method for comprehensive utilization of vanadium-titanium ore hot-briquetting rotary hearth furnace direct reduction-electric furnace melting. Background technique [0002] Minerals containing vanadium and titanium are world-recognized important strategic resources. Vanadium and titanium are important material guarantees for national economic development and national security. They are widely used in metallurgy, chemical industry, aerospace, national defense and military fields. Vanadium-titanium magnetite is the most important carrier of vanadium-titanium resources. It is widely distributed in Panxi, Chengde, Hanzhong, Xiangyang and other places in my country. Its reserves are abundant, exceeding 10 billion tons in Panzhihua alone. However, in view of the grade requirements of the current processing and utilization indust...

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Problems solved by technology

[0013] But above these methods mainly have the following problems: (1) add a large amount of binders in the process of preparing vanadium-titanium-titanium pellets, because the binders are expensive, the overall production cost remains high; (2) through The vanadium-titanium ore pellets prepared by adding a binder have very low strength under high temperature conditions, so in the process of entering the rotary hearth furnace for reduction, generally only single-layer cloth can be used instead of multi-layer cloth, which is greatly Reduced the production efficiency of the rotary hearth furnace reduction process; (3) additives and binders etc. will bring in a large amount of harmful impurity elements, such as S, P, Na, etc., which will cause great harm to the quality of molten iron; (4 ) Due to the addition of a binder, the energy consumption of the reduction process will be greatly increased, and the amount of slag will be increased in the electric furnace melting process, which will greatly increase the energy consumption and cost in the electric furnace melting process; A large amount of polluted liquid will be produced during the treatment of vanadium-titanium ore after sodium roasting. This kind of polluted liquid is difficult to handle and has a large environmental load. At the same time, sodium salt corrodes the furnace lining, which is not good for the maintenance of production equipment.

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