Smelting reduction method of iron ores containing titanium and external-fired coals

Abstract

The invention discloses a smelting reduction method of iron ores containing titanium and external-fired coals. The method comprises the following steps: step 1, crushing the iron ores containing titanium and the reduced coals and evenly mixing with a binder so as to prepare a raw material block mass; step 2, sending the raw material block mass into a prereduction furnace and carrying out drying, preheating and pre-reducing the raw material block mass; step 3, spraying a high-temperature flame generated during the coal firing of a coal-fired furnace into a smelting reduction furnace so that the smelting reduction furnace reaches a high temperature required for smelting reduction; and then sending the raw material block mass from the prereduction furnace into the smelting reduction furnace for carrying out reduction, smelting and slagging on the raw material block mass so as to obtain a molten iron and furnace slag. According to the method, the iron ores containing titanium can be directly smelted by using non-coked coal, so that the content of titanium dioxide in the smelted furnace slag is improved. Thus, the effective recycling of the titanium resources in the iron ores containing titanium is realized; and the recycling process of the titanium dioxide in the smelted furnace slag is obviously simplified. As a result, the recycling economy of the titanium resources in the iron ores containing titanium is improved.

Description

technical field [0001] The invention relates to an iron ore smelting process, in particular to a smelting reduction ironmaking method for vanadium-titanium magnetite. [0002] Background technique [0003] At present, many countries in the world have researched and developed many ironmaking methods, the most important of which is the blast furnace ironmaking method using iron ore as the main raw material. The blast furnace ironmaking method has good technical and economic indicators, simple process, large production volume, and high labor productivity. Advanced advantages. my country is rich in vanadium-titanium magnetite, which is widely distributed and rich in reserves. The proven reserves are 9.83 billion tons, and the prospective reserves are more than 30 billion tons. The main useful components of vanadium-titanium magnetite are 45-60% iron, 6-12% titanium oxide, 0.2-0.8% vanadium, and 0.1-2% chromium. For vanadium-titanium magnetite, if the blast furnace ironmaking ...

AI Technical Summary

Problems solved by technology

[0006] One of the objectives of the present invention is to solve the problem of low titanium dioxide content in the slag existing in the existing ilmenite-containing ironmaking method, which is not conducive to the recovery and utilization of titanium, and to provide a method for smelting reduction of ilmenite-containing external combustion coal On the one hand, non-coking coal can be directly used for ironmaking, and at the same time, the content of titanium dioxide in smelting slag can be increased to realize the effective recycling of titanium resources in ilmenite ore

[0007] Another object of the present invention is to solve the problem of complicated recovery process and high cost of titanium dioxide in the slag existing in the existing ilmenite-containing ironmaking method, and to provide a method for smelting reduction of ilmenite-containing external combustion of coal, which can Significantly simplify the recovery process of titanium dioxide in smelting slag, and improve the economical efficiency of the recovery and utilization of titanium resources in ilmenite ore

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