The method of reducing semi-steel steelmaking fumes

Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to a method for reducing smoke dust emission in the semisteel smelting process. The method for reducing semisteel steelmaking smoke dust mainly includes the steps that deoxygenation is carried out on the semisteel in the vanadium extraction and tapping process, a steelmaking converter is processed with a slag residual process after converter steelmaking tapping is finished, and deoxygenation and modification are conducted on steel slag in the converter before semisteel is added in the slag residual process. By means of the process, smoke dust generated in the semisteel steelmaking process can be obviously reduced; due to the fact that the slag residual process is adopted for the converter after tapping is finished, auxiliary and steel material consumption can be greatly lowered, and the process is shortened; and therefore, energy is saved, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for reducing smoke and dust emissions in a semi-steel smelting process. Background technique [0002] As far as the current actual situation of the metallurgical industry is concerned, smoke and dust account for the first place in polluting air pollutants. It is produced in almost all production processes in a large amount and in a wide range. Smoke generally refers to the particulate matter emitted by combustion, and generally contains unburned carbon particles. Most of the dust emitted by metallurgical furnaces has a particle size of less than 1 μm. Factors such as large amount of exhaust gas, fine particle size, high temperature, and complex composition have brought great difficulties to the smoke control technology. According to foreign analysis of the amount of dust emitted by the iron and steel industry, material transportation accounts for 30.9%, s...

AI Technical Summary

Problems solved by technology

However, during the tapping process of the converter and the iron mixing process, the molten iron tank will generate a large amount of smoke and dust. This link is limited by the process conditions, and a large amount of smoke and dust cannot be effectively captured, which belongs to fugitive emission and will cause environmental pollution.

Because semi-steel and steelmaking enterprises need to extract vanadium to realize the recycling of vanadium resources, there is a lot of smoke and dust when tapping after vanadium extraction; The promotion and application of slag technology, when the converter is mixed with semi-steel, the carbon in the semi-steel reacts with the FeO in the slag to produce a large amount of CO gas which is discharged with the furnace mouth, thus causing environmental pollution

For a long time, the problem of large smoke and dust when vanadium is extracted from semi-steel and mixed into semi-steel in the steelmaking converter has not been solved, so it is very important to provide a method for controlling smoke and dust in the process of semi-steel smelting

The patented process requires more parameters to be controlled, making the process more complicated; the added covering agent is SiO 2 、Al 2 o 3 , Fe 2 o 3 , MgO, which increases the production cost in the semi-steel production process. This patent does not explain the situation of the smoke and dust when the vanadium-extracted semi-steel is blended into the steelmaking converter, and after adding the covering agent, it will produce more when it is blended into the steelmaking converter. soot

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