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A kind of smelting method of magnesium reduction slag applied to converter steelmaking

A converter steelmaking and smelting method technology, applied in the fields of converter steelmaking smelting, magnesium reduction slag, and converter steelmaking process, can solve the problems of occupying land resources, environmental pollution, etc., and achieve the effect of promoting recycling

Active Publication Date: 2020-12-11
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic and foreign methods of reusing magnesium slag mainly focus on road construction materials, cement additives, desulfurizers, silicon-calcium-magnesium fertilizers, and refractory materials. The accumulation of emissions not only occupies a large amount of land resources, but also easily causes serious environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Present embodiment adopts smelting method of the present invention, concrete condition is:

[0048] For a 30t steelmaking converter, the silicon content of molten iron is 0.30%, and the phosphorus content is 0.082%. The slagging materials are lime, magnesium reduction slag particles and dolomite. The particle size of the magnesium reduction slag particles used is 20-100mm, in terms of mass percentage, the composition range is: CaO:53.50%, SiO 2 :28.25%, MgO:8.15%, Fe 2 o 3 :3.50%, Al 2 o 3 : 4.00%, others: 2.60%.

[0049] a. In the charging stage, 90% molten iron + 10% scrap steel is added in terms of mass percentage, and the temperature of the molten iron is 1285°C;

[0050] b. In the early stage of blowing, a 1200mm gun position is used to make slag to achieve rapid desiliconization and first dephosphorization. The gas supply method of top blowing oxygen and bottom blowing inert gas is adopted, and the strength of top blowing oxygen supply is 3.6Nm 3 / min / t, bot...

Embodiment 2

[0057] Present embodiment adopts smelting method of the present invention, concrete condition is:

[0058] For a 100t steelmaking converter, the silicon content of molten iron is 0.45%, and the phosphorus content is 0.120%, and the slagging materials are lime, magnesium reduction slag particles and dolomite. The particle size of the magnesium reduction slag particles used is 20-100mm, in terms of mass percentage, and the composition range is CaO:59.50%, SiO 2 :23.69%, MgO:6.91%, Fe 2 o 3 :5.40%, Al 2 o 3 : 1.50%, others: 3.00%.

[0059] a. In the charging stage, in terms of mass percentage, 86% molten iron + 14% scrap steel is added, and the temperature of the molten iron is 1305°C;

[0060] b. In the early stage of blowing, 1700mm gun position is used to make slag, and the gun position is lowered to 1500mm after 2 minutes to achieve rapid desiliconization and first dephosphorization. The gas supply method of top blowing oxygen and bottom blowing inert gas is adopted, and...

Embodiment 3

[0067] Present embodiment adopts smelting method of the present invention, concrete condition is:

[0068] For the 120t dephosphorization converter of the dual steelmaking process, the silicon content of the molten iron is 0.80%, and the phosphorus content is 0.220%. The slagging materials are lime, magnesium reduction slag particles and dolomite. The particle size of the magnesium reduction slag particles used is 10-50mm, and the composition range is CaO: 60.00%, SiO 2 :12.15%, MgO:11.90%, Fe 2 o 3 :6.95%, Al 2 o 3 : 4.00%, others: 5.00%.

[0069] a. In the charging stage, 75% molten iron + 25% thin steel scrap is added in terms of mass percentage, and the temperature of molten iron is 1350°C;

[0070] b. In the early stage of blowing, a 2000mm gun position is used to make slag to achieve rapid desiliconization and first dephosphorization, top blowing oxygen and bottom blowing inert gas, and the strength of top blowing oxygen supply is 1.8Nm 3 / min / t, bottom blowing ine...

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Abstract

The invention belongs to the steel metallurgy technology and the resource recycling field, and relates to a smelting method for applying magnesium reduction slag to converter steelmaking. According tothe smelting method, the magnesium reduction slag is screened to obtain particles with the particle size being 5 mm to 100 mm, and then the particles are conveyed to a steel-making workshop overheadbunker through a lifting hopper or a conveyor belt; in the converter blowing process, according to the different silicon contents of molten iron and the requirements for basicity of made steel type slag, the magnesium reduction slag serves as a slag forming material to be quantitatively added into a steelmaking converter in grading and controlled manners through a weighing hopper and a feeding chute; and the components of the magnesium reduction slag mainly comprise CaO, SiO2 and MgO, a small amount of Fe2O3 and Al2O3 are used in an assisting manner, and therefore formation of a low-melting and high-flow steelmaking multi-slag system is facilitated. By means of the smelting method, in each ton of steel, 5 kg-30 kg of magnesium reduction slag can be used, 5 kg to 20 kg of lime can be saved,2 kg to 10 kg of dolomite can be saved, and the dephosphorization rate is increased by 3% or more; and meanwhile, the resource utilization of the magnesium reduction slag can be realized, and the waste is changed into treasures.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy technology and resource recycling, in particular to the converter steelmaking process, and in particular to a smelting method in which magnesium reduction slag is applied to converter steelmaking. Background technique [0002] my country has been the world's largest producer of magnesium for many years, with an annual output of about 700,000 tons of magnesium, accounting for about 80% of the world's total output. At present, metal magnesium in my country is mainly produced by the Pidgeon method of silicon thermal reduction process, that is, dolomite is calcined at high temperature in a rotary kiln, and then reduced in a reduction furnace at about 1200 ° C and vacuum conditions to produce crude magnesium, and then refined by flux , ingot casting, and surface treatment to obtain metal magnesium ingots. The magnesium industry has low technical level, high pollution and high energy consumption...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/36C21C7/076
CPCC21C5/36C21C7/076Y02P10/20Y02P40/40
Inventor 吕明李航邢相栋王斌
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY