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Novel process of steelmaking deoxidization by utilizing precipitator dust of refining furnace

A refining furnace and a new process technology, which is applied in the field of dust removal and ash recycling in steelmaking plants, can solve the problems of green ball bursting, production decline, and the dosage should not be too high.

Active Publication Date: 2014-05-28
XINJIANG BAYI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(3) Zheng Xiancai, Yang Jun, and Li Qiang published the paper "Practice of Laiwu Iron and Steel Shaft Furnace Adding Steelmaking Dry Dust Removal and Fine Ash" in "Sintering Pellet" 2008 (3), expressing "during the production process, we noticed that When the amount of steelmaking dust removal reaches 7%, too little bentonite will cause serious bursting of raw pellets on the drying bed, which will affect the air permeability in the furnace, and will also make the pellet drum index, screening index, The compressive strength decreases and the output decreases significantly, therefore, the dosage should not be too high"; From the above information, it can be seen that there is no process for directly using the refining dust to make steel at present

Method used

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  • Novel process of steelmaking deoxidization by utilizing precipitator dust of refining furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Taking the converter smelting hard wire steel 70# steel as an example, the operation and feeding methods are as follows:

[0017] ① When the converter blowing is finished and the steel is ready to be tapped, the composition at the end of tapping is W[C]%=0.10%, the tapping temperature is 1600±20°C, and the refining furnace is used to remove dust and deoxidize;

[0018] ② Turn on the argon blowing gas at the bottom 3 minutes before tapping, and the stirring gas is 450L / min;

[0019] ③ Immediately after the molten steel is tapped from the converter, continue to add aluminum ingots for deoxidation. When the molten steel reaches 12 tons in the ladle, start to add the dust removal dust of the refining furnace with the steel flow of the converter tapping, so that the dust removal dust of the refining furnace can participate in the shortest time In this way, the dust from the refining furnace can quickly enter the molten steel to participate in the deoxidation reaction, and ca...

Embodiment 2

[0024] The SPHC steel for cold rolling is smelted with a converter, and the operation and feeding methods are as follows:

[0025] ① When the converter blowing is finished and the steel is ready to be tapped, the composition at the end of the tapping is W[C]%=0.045%, the tapping temperature is 1600±20°C, and the refining furnace is used to remove dust and deoxidize;

[0026] ② Turn on the argon blowing gas at the bottom 3 minutes before tapping, and the stirring gas is 350L / min.

[0027] ③ Immediately after the molten steel is tapped from the converter, continue to add 200kg of aluminum ingots (99% aluminum content) for deoxidation. When the molten steel reaches 12t in the ladle, start adding the bagged refining furnace dust along with the molten steel from the converter. , the addition of refining furnace dedusting ash is 4 kg / ton of steel.

[0028] ④ The dedusting ash of the refining furnace is guaranteed to be added before the molten steel is tapped. The tapping time of th...

Embodiment 3

[0032] Take the electric furnace smelting spring steel 60Si2MnA as an example;

[0033] Since the smelting of this steel type does not use aluminum deoxidation, it is a typical silicon-killed steel, and the product produced by deoxidation is SiO 2 , use the relational formula to calculate the amount of dedusting ash in the refining furnace:

[0034] Si+O 2 = SiO 2

[0035] CaO + MgO + SiO 2 =CaO MgO SiO 2

[0036]The composition of the end point of the electric furnace is W[C]%=0.52%, and the oxygen content in the molten steel before tapping can be calculated as W[O]%=0.48%, and 1400kg of ferrosilicon (silicon content is 72%) is added during the tapping process, The recovery rate of ferrosilicon is 95%. Using the refining ash produced by the intermediate converter production line in Table 2, the MgO content is 15.26%. Through calculation, it can be known that 288kg of refining ash needs to be added, that is, 4.1kg per ton of steel.

[0037] Specific operation and adding...

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Abstract

The invention provides a novel process of steelmaking deoxidization by utilizing precipitator dust of a refining furnace, comprising the steps of 1, under the circumstance that the blowing process of a converter or an electric furnace is finished, the carbon end-point composition W[C] %=0.1-0.6% and the tapping temperature is 1580-1620 DEG C during the tapping, connecting the bottom to blow argon gas 2-4min before the tapping and carrying out gas stirring at the speed of 150-480L / min; and 2, after the tapping of the liquid steel in the converter or the electric furnace, starting to continuously add tons of steel aluminium blocks or alloy to carry out deoxidization, and when the quantity of the liquid steel is 7-17t in a steel ladle, starting to add the precipitator dust of the refining furnace along with the steel flow of the tapping of the furnace, wherein the adding quantity of the steel aluminium blocks or alloy is confirmed according to carbon content of the liquid steel before the tapping, the tapping time of the furnace is 2-8min, the adding of the precipitator dust of the refining furnace needs to be finished in 3-4min and the adding quantity is 1.2-6kg / ton of steel. According to the invention, the precipitator dust of the refining furnace is adopted as the deoxidizing agent, so that the novel process is suitable for silicon killed steel and silicon-aluminium killed steel.

Description

technical field [0001] The invention relates to the recycling and utilization of dedusting ash in a steelmaking plant. It is used as a deoxidizer for tapping for deoxidation operation during tapping of electric furnace and converter steelmaking. It has realistic environmental protection for reducing the consumption of smelting deoxidizer and optimizing the discharge of dedusting ash. significance. Background technique [0002] The dust ash produced in the middle of the dust collector of the LF refining furnace has a small particle size of less than 5mm, which is a kind of alkaline industrial waste. Therefore, in the process of hauling, the prevention and control of dust pollution has always been the main factor restricting the comprehensive utilization of dust ash. One, in order to eliminate the dust pollution problem of dust removal dust, the current steelmaking and refining dust removal dust is basically treated with humidification, that is, in the process of dust removal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06C21B3/04
CPCY02W30/50
Inventor 俞海明王瑞利李栋黄星武陈跃军陈婷肖明光刘光宇徐栋李银花周兰新王晟安李立明胡永胜段建勇姜新平钟文斌王洪林王伟徐江杜嘉伦马辉戴达奎谢英明
Owner XINJIANG BAYI IRON & STEEL
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