A blast furnace optimized smelting method for high-titanium vanadium-titanium magnetite

Abstract

The invention relates to a blast furnace optimal smelting method for high-titanium vanadium titanium magnetite. The high-titanium vanadium titanium magnetite, common iron ores, cokes and the like formbatched materials by different ratios to charge in a furnace; rich-enriched air is fed in the furnace through an air port for smelting to guarantee full reduction of such metal elements as iron, vanadium, chromium and titanium in the high-titanium vanadium titanium magnetite; oxygen-enriched compressed air is injected at the lower part of a furnace cylinder to maintain a strong oxidation atmosphere in an area below a schreyerite slag strip plane and above a slag iron interface, so that titanium reduced from crystalline TiO2 is oxidized as non-crystalline TiO2 furnace slag, the generation of TiC+TiN refractory mixtures is inhibited, and the slag-iron separation is facilitated; in the smelting process, through change of the use level of the schreyerite and the common iron ores, the contentof TiO2 in the furnace slag is lower than 26%; and the level of silicon and titanium in molten iron is controlled to guarantee stable furnace temperature, so that the stable operation is guaranteed, the furnace conditions are smooth, the slag-iron separation is excellent and smooth, the recovery rate of such metal as iron, vanadium and chromium is increased, and the economical benefit is improved.

Description

technical field [0001] The invention belongs to the technical field of metal smelting, and in particular relates to a blast furnace optimized smelting method for high-titanium vanadium-titanium magnetite. Because there are 10 billion vanadium-titanium magnetite resources in the Panxi area, which contain more than 10 strategic metals such as vanadium, chromium, and iron, which are urgently needed by the military industry. It can be popularized and applied to four blast furnaces with an annual output of 20 million tons of iron in Sichuan and other developers who come to develop vanadium, chromium and titanium resources. Background technique [0002] The high-titanium vanadium-titanium magnetite blast furnace smelting process is a process determined by the construction of the third line, and it is also a worldwide problem. After 1995, the leaders of the company and the iron factory took advantage of the fact that the slag formation zone of the vanadium-titanium ore blast furna...

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Problems solved by technology

Ordinary mines began to gradually increase from 10% to more than 36%. The result: the recovery of strategic resource vanadium decreased by 35%, and its value accounted for one-third of the total income including iron and steel. It can be seen how much vanadium is lost; but the separation of slag and iron is not complete. The sticky slag is not completely eliminated, and the iron loss increases to 8-12%; the labor intensity and pollution level in front of the furnace are 2-3 times greater than those of ordinary ore smelting blast furnaces

This kind of smelting by increasing the amount of common ore to reduce high-titanium vanadium-titanium ore to low-titanium vanadium-titanium ore is not worth the gain, and it is very unscientific

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