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Enriched sludge balls for semi-steel steelmaking and slagging method for semi-steel steelmaking

A sludge ball and enrichment technology, which is applied in the field of converter semi-steelmaking, can solve the problems of slow slag incoming, accelerated CaO melting, and difficulty in slag removal, achieving the effect of overcoming the difficulty of slag removal and reducing pollution

Inactive Publication Date: 2015-11-18
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The melting point of CaO is as high as 2000°C and it is quite difficult to melt. In addition, the dicalcium silicate and tricalcium silicate that appear during the dissolution of lime form a shell on the lime surface, which hinders the internal CaO from melting into the slag, which becomes the speed of slagging. Restricted link
At present, in the slagging process of semi-steel making, there are problems such as difficulty in slag removal, slow slag incoming speed, and high TFe content in final slag
[0003] Therefore, there is a need for a flux that can promote the melting of CaO into the slag, thereby accelerating the melting of CaO, and solving the problems of difficult slag melting, slow slag incoming speed, and high TFe content in the final slag in the semi-steel steelmaking process

Method used

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  • Enriched sludge balls for semi-steel steelmaking and slagging method for semi-steel steelmaking
  • Enriched sludge balls for semi-steel steelmaking and slagging method for semi-steel steelmaking
  • Enriched sludge balls for semi-steel steelmaking and slagging method for semi-steel steelmaking

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027] The sludge generated by the converter dedusting system (the main component is: Fe 2 o 3 , FeO) and then add lime, binder and other materials to mix, pelletize and dry to obtain enriched sludge balls with a size of 10-80 mm. The composition is: FeO: 45%, Fe 2 o 3 : 15%, MFe: 5%, CaO: 8%, SiO 2 : 10%, Al 2 o 3 : 3%, MnO: 1%, MgO: 5%, P<0.2%, S<0.05%, moisture<1%, and the balance of unavoidable impurities.

[0028] The steel for SS(R) rails is smelted on a 120t converter in a steel factory. The actual weight of half-steel molten iron in the furnace is 138.8t, and the weight of the steel is 140.17t. The actual oxygen blowing volume is 6210m 3 . In the process of converter semi-steel slagging, the enriched sludge balls of this example are added. The composition and temperature of molten iron and steel entering the furnace are shown in Table 1.

[0029] Table 1 Composition (%) and furnace temperature (°C) of molten iron and steel entering the furnace

[0030]

[...

example 2

[0038] The sludge generated by the converter dedusting system (the main component is: Fe 2 o 3 , FeO) and then add lime, binder and other materials to mix, pelletize and dry to obtain enriched sludge balls with a size of 10-80mm, the composition of which is: FeO: 53%, Fe 2 o 3 : 10%, MFe: 7%, CaO: 6%, SiO 2 : 11%, Al 2 o 3 : 2%, MnO: 1%, MgO: 4%, P<0.2%, S<0.05%, moisture<1%, and the balance is unavoidable impurities.

[0039] Steel for SS(R) rails is smelted on a 120t converter in a steel plant. The actual weight of molten iron and steel entering the furnace is 135t, the weight of the steel is 136.54t, and the actual oxygen blowing volume is 6400m 3 . In the process of converter semi-steel slagging, the enriched sludge balls of this example are added. The composition and temperature of molten iron and steel entering the furnace are shown in Table 3.

[0040] Table 3 Composition (%) and furnace temperature (°C) of molten iron and steel entering the furnace

[0041] ...

example 3

[0049] The sludge generated by the converter dedusting system (the main component is: Fe 2 o 3 , FeO) and then add lime, binder and other materials to mix, pelletize and dry to obtain enriched sludge balls with a size of 10-80 mm. The composition is: FeO: 60%, Fe 2 o 3 : 8%, MFe: 10%, CaO: 5%, SiO 2 : 12%, Al 2 o 3 : 1%, MnO: 2%, MgO: 3%, P<0.2%, S<0.05%, moisture<1%, and the balance is unavoidable impurities.

[0050] 45 types of steel are smelted on a 120t converter in a steel factory. The actual weight of molten iron and steel entering the furnace is 134t, the weight of the steel is 134.42t, and the actual oxygen blowing volume is 6600m 3 . In the process of converter semi-steel slagging, the enriched sludge balls of this example are added. The composition and temperature of molten steel in the furnace are shown in Table 5.

[0051] Table 5 Composition (%) and furnace temperature (°C) of molten iron and steel entering the furnace

[0052]

[0053] Add the first ...

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Abstract

The invention provides an enriching sludge ball for semisteel steelmaking and a slagging method for semisteel steelmaking. The enriching sludge ball comprises the components in percentage by weight as follows: 45-60% of FeO, 8-15% of Fe2O3, 5-10% of MFe, 5-8% of CaO, 10-12% of SiO2, 1-3% of Al2O3, 1-2% of MnO, 3-5% of MgO, less than 0.2% of P, less than 0.05% of S, less than 1% of moisture and inevitable impurities. The slagging method comprises the following steps of: after blowing oxygen and blowing in a semisteel converter, adding the enriching sludge balls with active lime, high-magnesium lime and a slagger to the converter in two batches; and controlling the adding time and amount. According to the enriching sludge ball for semisteel steelmaking and the slagging method for semisteel steelmaking provided by the invention, semisteel is smelted, so that the problem that the slag is difficult to dissolve, the slag incoming speed is low, and the total iron content of the final slag is higher during smelting is solved, and the comprehensive treatment effect of resources recovery and pollution reduction can be obtained.

Description

technical field [0001] The invention belongs to the technical field of converter semi-steelmaking, and more specifically relates to an enriched sludge ball for semi-steelmaking and a slagging process using the enriched sludge ball in the semi-steelmaking process. Background technique [0002] Converter slagging is required to produce slag with strong refining ability as soon as possible, so it is required to melt slag early and well during blowing. The melting point of CaO is as high as 2000°C and it is quite difficult to melt. In addition, the dicalcium silicate and tricalcium silicate that appear during the dissolution of lime form a shell on the lime surface, which hinders the internal CaO from melting into the slag, which becomes the speed of slagging. Restricted link. At present, in the slagging process of semi-steelmaking, there are problems such as difficulty in slagging, slow slag incoming speed, and high TFe content in the final slag. [0003] Therefore, there is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C5/36C21C7/076
CPCY02P10/20
Inventor 陈路梁新腾陈永曾建华黄德胜
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP