Molten iron pretreatment slag skimming process

Abstract

The invention relates to a slag-raking technology of pre-treatment for molten iron, belonging to the refining field of pig iron. The invention is characterized in that: the slag-raking technology of pre-treatment for molten iron comprises the following steps: compressed air with the pressure 0.6MPa is blown by a blowing device, when the compressed air reaches 2 meters under the liquid level of the molten iron in the ladle, the air rises up to turn over the molten iron, thus generating boiling surface on the liquid level of the molten iron, due to the generation of the boiling surface of the molten iron, the initial state of the molten iron slag remained on the surface of the ladle is changed, for instance, the boiling surface of the molten iron extrudes the molten iron slag, resulting in polymerization of the molten iron slag. The invention can remove dead space of slag-raking, reduce actions of slag-raking, shorten time of slag-raking, improve work efficiency, reduce loss of the molten iron, and lower the production cost. A ladle with air brick internally mounted or externally mounted is the ideal facility for the pre-treatment of the molten iron.

Description

technical field [0001] The invention belongs to the field of pig iron refining, and relates to a slag removal process suitable for hot metal pretreatment in steel plants and iron plants. Background technique [0002] Currently. Domestic converter steelmaking uses molten iron as raw material, which contains high sulfur. Using this molten iron to directly make steel will cause large consumption of raw materials, long smelting time, and reduce furnace order problems. Therefore, high-sulfur molten iron should be pretreated. , Hot metal pretreatment equipment is an important equipment for reducing the sulfur content of molten iron in the metallurgical industry, and it is a necessary equipment to ensure the production of high value-added products in steel plants and iron plants. At present, the traditional method of slag accumulation in molten iron pretreatment slag removal operation is to use a slag accumulation material containing silicon element. Due to the high cost, poor sl...

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Problems solved by technology

Due to the high cost, poor slag gathering effect, high labor intensity of workers, and environmental pollution, this kind of material is easy to cause occupational diseases and other shortcomings, which has a great impact on production, use, environment and workers' health.