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Premelting composite slugging agent for converter and preparation method thereof

A slagging agent and pre-melting technology, which is applied in the field of iron and steel smelting, can solve the problems of high-quality converter slagging agent, low content of basic oxides in the slagging agent, and large melting heat absorption, etc. Oxygen at the end of the converter, improving the effect of slag removal, and the effect of low melting point

Inactive Publication Date: 2019-02-15
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the deslagging agent is fluorine-free and environmentally friendly, Al 2 o 3 High content, high melting point, and low content of basic oxides in the slagging agent, which is not conducive to slag splashing and furnace protection, and has a certain impact on dephosphorization
[0008] In summary, the existing slag removers have problems such as environmental pollution, large melting heat absorption, high melting point, high cost, and low dephosphorization, and cannot meet the requirements of high-quality converter slag removers

Method used

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  • Premelting composite slugging agent for converter and preparation method thereof
  • Premelting composite slugging agent for converter and preparation method thereof
  • Premelting composite slugging agent for converter and preparation method thereof

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preparation example Construction

[0025] The preparation method of the above-mentioned pre-melted composite slag-removing agent, the specific steps are as follows:

[0026] a. Mix lime, activated alumina powder and silica powder in proportion, and then pre-melt at 1350-1500°C to obtain pre-melt material. After the pre-melt material is cooled, it is crushed. After crushing, it passes through a 5mm sieve, and the residue ≤ 5 %, take the sieve for subsequent use;

[0027] b. Take the sieved material and active magnesium oxide powder, iron oxide powder, low-sulfur cement and activator to make ingredients in proportion, dry mix the ingredients, add water after mixing to get wet mix;

[0028] c. Press the wet mixture into balls to obtain wet balls with a particle size of 40-50mm. Heat the wet balls to 280-300°C, keep them warm for 4-6 hours, and dry them until the moisture content of the finished product is ≤0.5%. A pre-melted composite slag remover is obtained.

Embodiment 1

[0030] The invention discloses a composite slagging agent for converter steelmaking. The raw materials are lime, iron oxide powder, activated alumina powder, activated magnesium oxide powder, low-sulfur cement (low-sulfur Portland cement), silica powder and stearic acid. Raw material sampling analysis:

[0031] Lime: CaO85%, S 0.20%;

[0032] Activated alumina powder: Al 2 o 3 82%, Al 15%;

[0033] Activated magnesium oxide powder: MgO 85%;

[0034] Silica powder: SiO 2 90%, particle size ≤ 3mm;

[0035] Iron oxide powder: Fe 2 o 3 85%;

[0036] The specific production process is as follows:

[0037] 1) Mixing pre-melting

[0038]Lime, activated alumina powder, and silica powder are mixed according to the mass ratio of 70:10:30, mixed and heated to 1450°C for pre-melting, and the pre-melt is obtained after melting;

[0039] 2) Crushing and sieving of premelt

[0040] After the premelt is cooled, it is ground and crushed, passed through a 5mm sieve, and the unders...

Embodiment 2

[0053] The invention discloses a composite slagging agent for converter steelmaking. The raw materials are lime, iron oxide powder, activated alumina powder, activated magnesium oxide powder, low-sulfur cement (low-sulfur Portland cement), silica powder and stearic acid. Raw material sampling analysis:

[0054] Lime: CaO 92%, S 0.22%;

[0055] Activated alumina powder: Al 2 o 3 70%, Al 26%;

[0056] Activated magnesium oxide powder: MgO 90%;

[0057] Silica powder: SiO 2 95%, particle size ≤ 3mm;

[0058] Iron oxide powder: Fe 2 o 3 90%;

[0059] The specific production process is as follows:

[0060] 1) Mixing pre-melting

[0061] Lime, activated alumina powder, and silica powder are mixed according to the mass ratio of 70:30:30, and then heated to 1350°C for pre-melting, and the pre-melt is obtained after melting;

[0062] 2) Crushing and sieving of premelt

[0063] After the premelt is cooled, it is ground and crushed, passed through a 5mm sieve, and the under...

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Abstract

The invention relates to a premelting composite slugging agent for a converter and a preparation method thereof. The slugging agent comprises raw materials of lime, ferric oxide powder, activated aluminum oxide powder, low-sulfur cement, silica powder and an activating agent, wherein the raw materials comprise the following components in percentage by mass: 15-35% of CaO, 15-35% of Fe2O3, 5-15% ofAl2O3, 5-15% of MgO, and not greater than 15% of SiO; and the slugging agent contains not greater than 0.25% of impurity element S. According to the slugging agent, the raw materials are environmentally friendly; the melting point is low; the slagging speed is high; the breathability of slags can be obviously improved; the splashing in the converting process is reduced; and meanwhile, the slugging effect in the converting process can be effectively improved through the slugging agent, and the converting process is stable; the slugging agent avoids re-drying and gun adhering; in addition, theend point oxygen of a converter can be decreased after the converting slugging effect is improved, so that the oxidization of the slags can be reduced; the steel iron consumption is decreased; and theproduction cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and relates to a pre-melted composite slag reducing agent for a converter and a preparation method thereof. Background technique [0002] Converter slag is a multi-component melt formed with oxides as the main component. It plays the role of separating impurities, removing harmful components in crude metals, enriching useful metal oxides, and refining metals during the smelting process. Therefore, good smelting of slag is a necessary prerequisite for good steel making. During the converter blowing process, due to the continuous change of molten steel composition and molten pool temperature, and with the addition of various slagging materials such as lime and dolomite, the composition and properties of slag are also constantly changing. Different blowing stages of the converter have different smelting tasks. Therefore, the requirements for controlling the composition of the slag a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/36C21C7/076
CPCC21C5/36C21C7/076Y02P10/20
Inventor 沈继胜朱万军刘凯齐江华周甫陈俊孚杨成威孙伟
Owner 武汉钢铁有限公司
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