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Dolomite-based desulfurizer based on in-situ reduction and preparation thereof

A technology based on desulfurization agent and dolomite, applied in the field of desulfurization, can solve the problems of low utilization rate of magnesium, low efficiency of magnesium desulfurization, high price, etc., and achieve the effect of stable desulfurization products, high utilization rate of desulfurization agent, and no temperature drop

Active Publication Date: 2008-11-12
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mg-based desulfurizer is currently the first choice for hot metal desulfurization outside the furnace. However, magnesium-based desulfurizers are still expensive in hot metal pretreatment, and the desulfurization efficiency of magnesium is low and the utilization rate of magnesium is not high due to the excessive bubbles of magnesium steam ( Less than 50%) and other disadvantages

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Dolomite was calcined at 1000°C for 200min to obtain calcined dolomite with calcined white activity of about 35%, and calcined dolomite, graphite, aluminum powder, ferrous oxide powder, SiO 2 and fluorite were dried in a drying oven at a temperature of 120°C for 20 hours, and then put into a planetary ball mill and ground at a speed of 300 rpm until the particle size was less than 200 mesh.

[0019] Calcined dolomite powder, graphite powder, aluminum powder, ferrous oxide powder, SiO 2 The powder and fluorite powder are mixed in proportion, and the mass ratio of each material powder is calcined dolomite: (aluminum powder + ferrous oxide powder): graphite: SiO 2 : Fluorite = 60: 18: 12: 5: 5; then use a 200T sample making machine to press into spherical or other shaped pellets with a pressure of 20 MPa to prepare a dolomite-based desulfurizer.

[0020] In the iron or steel tapping process, the prepared dolomite-based desulfurizer is added into the ladle or ladle, and th...

Embodiment 2

[0022] Using dolomite as raw material in the magnesium smelting process, the waste material formed by calcined dolomite with a particle size of less than 0.075mm is used as raw material, and calcined dolomite, Si-Fe alloy, aluminum powder, ferric oxide powder, SiO 2 and fluorite were dried in a drying oven at a temperature of 140°C for 16 hours, and then put into a planetary ball mill and ground at a speed of 300 rpm until the particle size was less than 200 mesh; the Si-Fe alloy contained 75% by mass of Si.

[0023] Calcined dolomite powder, Si-Fe alloy powder, aluminum powder, ferric oxide powder, SiO 2 The powder and fluorite powder are mixed in proportion, and the mass ratio of each material powder added is calcined dolomite: (aluminum powder + ferrous oxide powder): Si-Fe alloy: fluorite=65:17:15:3; then use 200T The sample preparation machine is pressed into spherical or other shaped pellets with a pressure of 30MPa to prepare a dolomite-based desulfurizer.

[0024] In ...

Embodiment 3

[0026] Dolomite was calcined at 1300°C for 120min to obtain calcined dolomite with a calcined white activity of about 35%. Calcined dolomite, Al-Si alloy, aluminum powder, ferric oxide powder, SiO 2 and fluorite were dried in a drying oven at a temperature of 160°C for 12 hours, and then put into a planetary ball mill and ground at a speed of 300 rpm until the particle size was less than 200 mesh; the Al-Si alloy contained Al and Si in different mass percentages. 50%.

[0027] Calcined dolomite powder, Al-Si powder, aluminum powder, ferrous oxide powder, SiO 2 The powder and fluorite powder are mixed in proportion, and the mass ratio of each material powder is calcined dolomite: (aluminum powder + ferric oxide powder): Al-Si alloy: SiO 2 : Fluorite = 65: 20: 10: 3: 2; then use a 200T sample making machine to press into spherical or other shaped pellets with a pressure of 40 MPa to prepare a dolomite-based desulfurizer.

[0028] In the iron or steel tapping process, the prepa...

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Abstract

The invention relates to a dolomite matrix desulfurizer based on in-situ reduction and a method for preparing the same. The invention is characterized in that: the dolomite matrix desulfurizer consists of dolime, reducer, self-propagating exothermic agent, reaction promoter and fluorite; the dolime, the reducer, aluminum powders, ferrous iron oxide powders or ferric oxide powders, the reaction promoter and the fluorite are respectively dried for 4 to 20 hours at a temperature of between 120 and 200 DEG C, mixed, grinded by a ball grinding machine till the granularity is less than 200 meshes, then made into particles in a spherical shape or other shapes by a sampling machine at a pressure of between 20 and 50 MPa, thereby preparing the dolomite matrix desulfurizer. The dolomite matrix desulfurizer is adopted for desulphurization reaction, has the advantages of low desulphurization cost, high utilization rate of desulfurizer, high desulphurization rate, no obvious temperature reduction in the desulphurization process, no need of specialized desulphurization equipment, simple operation, etc. and has the desulphurization rate of over 85 percent.

Description

technical field [0001] The invention relates to the technical field of desulfurization, and mainly relates to a dolomite-based desulfurizer based on in-situ reduction and a preparation method thereof. Background technique [0002] Sulfur in steel has adverse effects on steel performance, and sulfur in steel will reduce the plasticity and toughness of steel. The performance of steel is an inflection point at the sulfur content of 0.013%. However, modern industry has particularly strict requirements on the sulfur content in steel, and the high-performance pure steel requires that the sulfur content be reduced to below 0.01-0.001%. With the emergence of step-by-step steelmaking, the converter steelmaking process has been decomposed into three stages: molten iron pretreatment, converter smelting, and out-of-furnace refining. Various chemical reactions are carried out under their optimal conditions, and the quality is purer. High-quality steel meets the higher requirements of va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C01G1/02
CPCY02P10/20
Inventor 张廷安刘燕豆志河赫冀成任晓冬赵秋月牛丽萍蒋孝丽
Owner NORTHEASTERN UNIV
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