A method for removing slag from molten iron

Abstract

The invention discloses a molten iron slag-removal method, and belongs to the field of molten iron desulfurization pretreatment. The molten iron slag-removal method comprises the following steps of: hoisting a roasted hot metal ladle with a slide plate mechanism to a molten iron carrying position through an overhead crane with a weighing device, recording weight of an empty idle, carrying molten iron, and performing temperature measuring and sampling after tapping is completed; then, performing desulfuration according to a normal procedure, and performing temperature measuring and sampling after desulfuration is completed; hoisting the hot metal ladle subjected to desulfuration, and recording weight of the full ladle, thereby obtaining total weight of the molten iron and iron slag; moving a long nozzle to a position above a common hot metal ladle, opening a slide plate, naturally injecting the molten iron into the common hot metal ladle from the long nozzle to perform ladle pouring operation, displaying through a scale of the overhead crane, respectively closing the slide plate once when residual molten iron is 10 ton and 5 ton, and starting a slag-unloading monitoring and control system when the molten iron is reduced to be 10 ton. The molten iron slag-removal method has the advantages of being simple, stable and controllable, getting rid of limitation that technical level of people is depended, and realizing automatic control on stable control. The molten iron slag-removal method guarantees an iron slag separation effect, can realize 100% slag-free control, and prevents reflux to the greatest extent.

Description

technical field [0001] The invention belongs to the field of molten iron desulfurization pretreatment, and in particular provides a method for removing slag from molten iron, which uses a sliding plate to stop the slag from molten iron to remove the slag from the molten iron. Background technique [0002] As a pre-process of steelmaking, molten iron pretreatment has gradually become a standard process in modern steel mills. This can not only achieve the purpose of improving product quality and reducing the sulfur content in steel, but also reduce the cost of desulfurization. At present, the commonly used molten iron desulfurization is mainly divided into two categories: torpedo tank desulfurization and ladle desulfurization, and ladle desulfurization mainly includes injection granular magnesium desulfurization, KR desulfurization, composite injection desulfurization and other methods, but all these methods are in the next process. (converter, electric furnace) must be separa...

AI Technical Summary

Problems solved by technology

The common problems of these methods are that the efficiency is low, the effect is difficult to guarantee, the requirements for equipment are high, the environment pollution is serious, the working environment is poor, especially the requirements for the technical level of the operator are very high, and the operator's line of sight will also be affected by the equipment. Due to the influence of restrictions and dust, the guarantee effect of this process is the basis of all subsequent processes, which will greatly affect the stability of the metallurgical effect of each process, so there is an urgent need for a simple and reliable method to remove slag from molten iron

[0003] In order to satisfy the development of ultra-low sulfur steel grades, in order to ensure the effect of molten iron slag removal, and to liberate the current situation that the molten iron slag removal process is too dependent on people, the human operation that cannot be stably controlled is changed to automatic control that can be stably controlled, and at the same time improve According to the working environment of operators, a simple and easy method for removing slag from molten iron has been developed

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