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Slag skimming method

A slag scraping and slag raking technology is applied in the field of slag scraping and desulfurization pretreatment in molten iron tanks, which can solve problems such as the wasted cost of molten iron, and achieve the effects of reducing production costs and saving iron resources.

Inactive Publication Date: 2009-06-03
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The task of the present invention is to provide a slag removal method that solves the problems of molten iron waste and high cost by means of standardized operation

Method used

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Embodiment Construction

[0009] First, determine the amount of slag that should be kept in the molten iron tank according to the sulfur content in the molten iron and the type of steel to be pre-smelted, and then start the slag removal operation. When removing slag, first slowly tilt the molten iron tank to a position where the slag surface is 90-110 mm away from the slag removal nozzle (the best position is 100 mm). Slowly tilt the molten iron tank so that the molten iron in it is stable and does not fluctuate It is advisable to extend the slag rake used for slag removal into the molten iron tank through the operation of the slag removal machine, and keep a gap of 18-22 mm (20 mm at best) between the bottom of the slag rake and the liquid level of the molten iron. When removing slag, slowly remove the slag to the slag mouth and stay for a short time. The residence time is generally 1-2 seconds, generally no more than 5 seconds, and then remove the slag into the slag tank until The slag remaining in t...

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Abstract

The invention relates to a slag skimming method which comprises the following steps: slag amount which can be retained in a hot metal ladle is ascertained according to sulfur content and steel grade in hot metal; first the hot metal ladle is slowly tipped over, so that the slag surface is positioned below a slag skimming mouth; a slag rake used for slag skimming is extended into the hot metal ladle, and a certain distance is retained between the bottom of the slag rake and the liquid level of the hot metal; during slag skimming, slag is slowly raked to the slag skimming mouth and stayed for 1 to 5 seconds; and then the slag is raked to a slag ladle. By means of slowly tipping over the hot metal ladle, retaining a distance between the slag rake and the bottom surface of the slag, and staying the slag rake, the hot metal is prevented from being raked out, thereby reducing production cost and saving a great quantity of iron resources.

Description

Technical field: [0001] The invention relates to a method for removing slag, in particular to a method for removing slag in a molten iron tank for pretreatment of desulfurization. Background technique: [0002] When smelting alloy steel or other steel types, it is usually necessary to pretreat molten iron, and the main purpose of pretreatment is to desulfurize molten iron, and the desulfurized sulfur is basically contained in slag, that is, desulfurization slag. In order to prevent the molten iron after desulfurization pretreatment from bringing desulfurization slag into the converter when it enters the next process such as the converter, all or part of the slag floating on the surface of the molten iron should be removed according to the requirements of the steel type before entering the converter. The traditional slag removal method is to directly remove slag with a slag rake, and determine the amount of slag remaining based on experience and visual inspection. Although t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D43/00
Inventor 吉小兵孔令雷李彦萍张治国阎凤义
Owner BENGANG STEEL PLATES