Desulfurizing agent and desulfurizing method for converter

A desulfurizer, converter technology, applied in the direction of manufacturing converters, etc., can solve the problems of high equipment manufacturing cost and operating cost, steelmaking cost enterprise burden, long process, etc., to reduce the overall cost of steelmaking, shorten the production cycle, improve The effect of production efficiency

Pending Publication Date: 2021-08-20
HEBEI XINDA IRON & STEEL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The desulphurization capacity of the converter is limited, and only about 40% of the sulfur in the molten iron can be removed by one carbon pull, mainly because the converter smelting is an oxidation reaction, and desulphurization requires reducing conditions, which makes it difficult to desulphurize during the blowing process
At present, the equipment used for desulfurization in steelmaking mainly includes molten iron pretreatment and LF refining furnace, but the equipment manufacturing cost and operating cost are relatively high, and the process is long, which increases the production cycle of steelmaking, which is not conducive to improving the production efficiency of steelmaking, resulting in The cost is high; especially at present, the environmental protection situation is severe, the steel market is depressed, and the increase in steelmaking costs will undoubtedly cause serious burdens to enterprises

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0012] The preparation method of the desulfurizer for the converter is as follows: mix the above proportioned silicomanganese alloy powder, low-sulfur petroleum coke and binder, add water pressure balls, and then dry.

[0013] This converter desulfurization method adopts the above-mentioned desulfurizing agent, and the method and process are as follows: add the desulfurizing agent into the scrap steel hopper and add it together with the scrap steel. ℃; after the start of oxygen supply, add 70% to 80% of the total amount of slagging material in the first batch, the blowing gun position in the early stage is 80-120mm lower than the normal blowing, and the oxygen pressure is the normal blowing oxygen pressure, which is controlled at 0.8- 0.9MPa; the position of the process gun is 50-100mm lower than that of normal blowing, the position of the carbon pulling gun is the same as that of normal blowing, and the whole process adopts constant pressure variable gun operation; because the...

Embodiment 1

[0015] Embodiment 1: This converter desulfurization method adopts the following specific processes.

[0016] (1) The desulfurizer is made of the following raw materials in mass percentage: 80% of silicon-manganese alloy powder, 10% of low-sulfur petroleum coke and 10% of binder. The particle size of the silicon-manganese alloy powder is ≤20mm, the manganese content is 68.2wt%, and the silicon content is 19.7wt%. The particle size of the low-sulfur petroleum coke is ≤5mm, the carbon content is 93.5wt%, and the sulfur content is 0.8wt%. The agent uses high calcium ash powder.

[0017] (2) Smelting process: A 150-ton converter is used to smelt the steel grade Q195L, and the steel grade requires the sulfur content of the billet to be less than 0.035%. Load 140 tons of molten iron, 30 tons of scrap steel, and the sulfur content of the molten iron is 0.062%. Add the desulfurizer into the scrap steel bucket and add it together with the scrap steel. The amount of addition is 10 kg / t...

Embodiment 2

[0019] Embodiment 2: This converter desulfurization method adopts the following specific processes.

[0020] (1) The desulfurizer is made of the following raw materials in mass percent: 75% of silicon-manganese alloy powder, 12% of low-sulfur petroleum coke and 13% of binder. The particle size of the silicon-manganese alloy powder is ≤20mm, the manganese content is 66.9wt%, and the silicon content is 20.1wt%. The particle size of the low-sulfur petroleum coke is ≤5mm, the carbon content is 92.6wt%, and the sulfur content is 1.6wt%. The agent adopts high magnesium ash powder surface.

[0021] (2) Smelting process: A 150-ton converter is used to smelt the steel grade Q235B, and the steel grade requires the sulfur content of the billet to be less than 0.035%. Load 140 tons of molten iron, 30 tons of scrap steel, and the sulfur content of the molten iron is 0.038%. Add the desulfurizer into the scrap steel bucket and add it together with the scrap steel. The addition amount is 5...

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Abstract

The invention discloses a desulfurizing agent and desulfurizing method for a converter. The desulfurizing agent is prepared from the following raw materials in percentage by mass: 75-85% of silicon-manganese alloy powder, 8-12% of low-sulfur petroleum coke and 7-13% of an adhesive. The silicon-manganese alloy powder in the desulfurizing agent is oxidized and releases heat in the converter, the melting of lime is facilitated under the condition of low iron oxide in slag, the alkalinity of the slag is improved, the slag quantity is increased, and a'three-high and one-low 'desulfurization thermodynamic condition is created for the converter; and after the low-sulfur petroleum coke in the desulfurizing agent is oxidized, a large amount of CO gas can be generated, so that the earlier-stage stirring force of a molten pool is increased, and a good dynamic condition is created for converter desulfurization. The desulfurizing agent and the desulfurizing method can effectively improve the desulfurization rate of the converter, shorten the production period, improve the production efficiency and reduce the comprehensive cost of steelmaking.

Description

technical field [0001] The invention relates to a desulfurizing agent, in particular to a desulfurizing agent for a converter and a desulfurizing method. Background technique [0002] The desulfurization capacity of the converter is limited, and only about 40% of the sulfur in the molten iron can be removed by one-time carbon pulling, mainly because the converter smelting is an oxidation reaction, and desulfurization requires reducing conditions, which makes it difficult to desulfurize during the blowing process. At present, the equipment used for desulfurization in steelmaking mainly includes molten iron pretreatment and LF refining furnace, but the equipment manufacturing cost and operating cost are relatively high, and the process is long, which increases the production cycle of steelmaking, which is not conducive to improving the production efficiency of steelmaking, resulting in The cost is high; especially the current environmental protection situation is severe, the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C5/28
CPCC21C7/064C21C5/28C21C7/0006C21C7/005C21C7/0025
Inventor 王松伟尹志钊朱学理
Owner HEBEI XINDA IRON & STEEL GRP CO LTD
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