A kind of converter steelmaking method

A converter steelmaking and ton steel technology, applied in the direction of manufacturing converters, lime production, process efficiency improvement, etc., can solve the problems of high production cost of converter steelmaking, affecting the quality of molten steel, rising prices, etc., to improve the smelting process, Reduced erosion damage and reduced lime consumption

Active Publication Date: 2017-06-06
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, steel scrap resources are tight and prices are rising, resulting in higher production costs for converter steelmaking; in addition, some scrap steel contains a certain amount of non-ferrous metal element impurities, such as copper, and these non-ferrous metal element impurities are in the converter steelmaking process. It is difficult to remove, and most of them are left in the finished molten steel, which seriously affects the quality of molten steel

Method used

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  • A kind of converter steelmaking method
  • A kind of converter steelmaking method
  • A kind of converter steelmaking method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1) First weigh iron oxide scale, dedusting ash and water of a certain quality, and control the dedusting ash to be the dust produced in the converter steelmaking process, including the following components in weight percentage: TFe: 50%, CaO: 8%, SiO 2 : 1%, MgO: 2%;

[0045] It is 3.5:5.5:1 to control the mass ratio of iron oxide scale, dedusting ash and water;

[0046] Then use a mixer to mix evenly, then feed the material to the brick press mold, and use a brick press to press and form the blank, then mix the blank, reducing agent and desulfurizing agent, put it into a refractory tank, and carry out reduction roasting treatment, select coke powder As a reducing agent, lime powder is selected as a desulfurizing agent, and the treatment temperature of the reduction roasting treatment is controlled to be 1150° C., and the treatment time is 18 hours to obtain reduced iron made from dedusting ash, which comprises the following components in weight percent: TFe:75 %, P: ...

Embodiment 2

[0052] 1) First weigh iron oxide scale, dedusting ash and water of a certain quality, and control the dedusting ash to be the dust produced in the converter steelmaking process, including the following components in weight percentage: TFe: 55%, CaO: 13%, SiO 2 : 1.1%, MgO: 3.5%;

[0053] Control the mass ratio of described iron oxide scale, dedusting ash and water to be 3:6:1;

[0054] Then use a mixer to mix evenly, then feed the material to the brick press mold, and use a brick press to press and form the blank, then mix the blank, reducing agent and desulfurizing agent, put it into a refractory tank, and carry out reduction roasting treatment, select coke powder As a reducing agent, lime powder is selected as a desulfurizing agent, and the treatment temperature of the reduction roasting treatment is controlled to be 1185° C., and the treatment time is 17 hours to obtain reduced iron made from dedusting ash. The reduced iron made from dedusting ash includes the following co...

Embodiment 3

[0060] 1) First weigh iron oxide scale, dedusting ash and water of a certain quality, and control the dedusting ash to be the dust produced in the converter steelmaking process, including the following components in weight percentage: TFe: 60%, CaO: 18%, SiO 2 : 1.2%, MgO: 5%;

[0061] It is 2.5:6.5:1 to control the mass ratio of iron oxide scale, dedusting ash and water;

[0062] Then use a mixer to mix evenly, then feed the material to the brick press mold, and use a brick press to press and form the blank, then mix the blank, reducing agent and desulfurizing agent, put it into a refractory tank, and carry out reduction roasting treatment, select coke powder As a reducing agent, lime powder is selected as a desulfurizing agent, and the treatment temperature of the reduction roasting treatment is controlled to be 1220° C., and the treatment time is 16 hours to obtain reduced iron made from dedusting ash, which comprises the following components in weight percentage: TFe:80 ...

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Abstract

The invention discloses a converter steelmaking method. Reduced iron made of dust ash is used for replacing all scrap steel and part of ore for converter steelmaking, and thus the problem of high cost caused by utilizing scrap steel is solved, and the quality problem caused by nonferrous metal impurities in the scrap steel is completely solved; in this way, the probability of splashing is lowered, the hydrogen content of molten steel is decreased, and the quality of finished molten steel is improved; it is easily guaranteed that a proper terminal temperature is obtained, and the FeO content of final slag can be decreased easily; the quantity of non-metallic impurities in the molten steel is reduced, corrosive damage of the molten steel to a furnace lining is reduced, and the service life of a furnace body is prolonged; lime consumption is lowered by about 12 kg per ton of steel, and the additive amount of lime is reduced by 25%-30% compared with the prior art; metallic iron which is contained in dust ash and is originally accumulated as waste is efficiently recovered, and the recovery rate of metallic iron of a whole system is increased, remarkable economical benefits are achieved, and the environment is protected.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a converter steelmaking method. Background technique [0002] The iron-containing materials used in conventional converter steelmaking are mainly molten iron, scrap steel and ore. [0003] The main function of scrap steel is to balance heat. At present, steel scrap resources are tight and prices are rising, resulting in higher production costs for converter steelmaking; in addition, some scrap steel contains a certain amount of non-ferrous metal element impurities, such as copper, and these non-ferrous metal element impurities are in the converter steelmaking process. It is difficult to remove, and most of them remain in the finished molten steel in the end, seriously affecting the quality of molten steel. [0004] Therefore, how to reduce the negative impact of steel scrap on converter steelmaking, reduce the production cost of converter steelmaking, and redu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C5/32
CPCY02P10/20Y02P40/40
Inventor 贾崇雪王念欣刘晓美王博梁栋刘洪银刘效森李士波宋林海赵统国
Owner SHANDONG IRON & STEEL CO LTD
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