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Slag splashing furnace protection method for modifying converter slag through bottom blowing powder spraying

A converter slag and converter bottom technology, which is applied in the field of mining and smelting, can solve the problems of long slag incubation time and high cost of modifiers, and achieve the effects of shortening the slag splashing time, the thickness of the slag splashing layer, and reducing the cost of steelmaking.

Inactive Publication Date: 2022-02-08
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems existing in the prior art, to provide a slag splash protection method for converter slag modified by bottom blowing and powder spraying, and to overcome the slag generation during slag splashing in the existing slag splashing technology after adding modifiers Defects of long incubation time and high cost of modifier

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Applying the present invention to a 180-ton converter, the slag splashing of modified converter slag by spraying bottom spraying powder as an example will be described, specifically including the following steps:

[0023] Step 1: Select 6 bottom-blowing lances according to the furnace capacity of 180 tons. It is vertically installed and fixed on the bottom of the converter, and the nozzle of the spray gun is set vertically upward. At the same time, the raw dolomite powder is pressurized and transported to the powder spray tank 1, and the passivated lime powder is pressurized and transported to the powder spray tank 2. Each The gas in the powder tank is emptied through the built-in relief valve. The tank pressure is greater than the conveying pressure. The lower part of the powder tank is fluidized by a fluidizer. The injection pipe and the outlet at the bottom of the powder spray tank are used to precisely control the discharge rate through the feed valve and the feed t...

Embodiment 2

[0030] The present invention is applied to a 60-ton converter, and the slag splashing of modified converter slag by bottom spraying powder is taken as an example to illustrate, and specifically includes the following steps:

[0031] Step 1: Select 2 bottom-blowing lances according to the 60-ton converter capacity. The inner diameter of the converter bottom is D. The bottom-blowing lances are arranged on the 0.6D indexing circle of the furnace bottom. The 2 bottom-blowing lances are arranged symmetrically and fixed vertically. At the bottom of the converter, the nozzle of the spray gun is set vertically upward; the bottom blowing spray gun is a single-tube type, which can carry nitrogen and powder. Lime powder is conveyed to the second powder spraying tank under pressure, and each powder spraying tank empties the air in the powder tank through its own relief valve. The tank pressure is greater than the delivery pressure, and the lower part of the powder spraying tank is fluidize...

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PUM

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Abstract

The invention provides a slag splashing furnace protection method for modifying converter slag through bottom blowing powder spraying. The method is characterized in that a bottom blowing spray gun is arranged at the bottom of a converter; after steel tapping of the converter is finished, the converter is shift to a zero position; and while nitrogen is opened for slag splashing through an oxygen reduction gun, the bottom blowing spray gun spray raw dolomite powder or mixed powder of the raw dolomite powder and passivated lime powder as a modifier into a converter molten pool from the bottom of the converter, wherein nitrogen is used as a carrier gas in the injection process. Compared with a traditional slag splashing furnace protection process, the powder is injected from the bottom of the converter to serve as the slag modifier, efficient and uniform mixing can be achieved in a short time, and the modifier does not need to be melted by shaking the converter front and back, so that the slag splashing time is shortened, a slag splashing layer is thick, erosion is resisted, the slag splashing effect is improved, and the service life of a furnace lining is prolonged; the modifier used in the invention is waste materials such as powder generated during manufacturing of raw dolomite and lime in steelmaking, and the price is low, so that the steelmaking cost is reduced, and an approach is provided for utilizationof the waste materials such as powder generated during manufacturing of raw dolomite and lime.

Description

technical field [0001] The invention belongs to the technical field of mining and smelting, and relates to a slag-splashing furnace protection method for modifying converter slag by bottom blowing and spraying powder. Background technique [0002] The technology of slag splashing to protect the furnace can greatly increase the life of the converter. The increase in the life of the converter reduces the consumption of refractory materials for steelmaking in the converter, saves resources, and improves the utilization rate of the converter and steel production. However, as the demand for low-carbon steel and low-phosphorus steel in converter smelting increases, the oxidation of slag at the end of converter blowing increases. The high oxidation of slag will affect the protection effect of converter slag splashing and reduce the life of converter lining. Therefore, it is necessary to modify the highly oxidative final slag of the converter. During the slag splashing operation, re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/34C21C5/36
CPCC21C5/36C21C5/34Y02P10/20
Inventor 富志生
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD