Mixed slag smelting reduction production and thermal refining method

A technology for quenching and tempering treatment and slag smelting, which is applied in the field of mixed slag smelting reduction production and quenching and tempering treatment, and can solve the problems of increasing the difficulty of grinding, the inability to use cheap coking coal resources, and limitations.

Active Publication Date: 2016-12-07
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increasingly scarce coking coal resources, the price of metallurgical coke is getting higher and higher, but the abundant and cheap coking coal resources cannot be fully used in ironmaking production
The production of sinter, pellets and coking coal has brought serious environmental pollution, and the increasingly stringent environmental protection requirements have restricted blast furnace ironmaking technology;
[0005] (3) The reduction time of the traditional blast furnace is long. Although the enhanced smelting technology is adopted, the continuous improvement of productivity by relying on the enhanced smelting process is greatly limited;
[0006] (4) A large amount of flux is added;
[0007] (5) Difficult to deal with low-g

Method used

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  • Mixed slag smelting reduction production and thermal refining method

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Effect test

Embodiment 1

[0151] A method for smelting reduction production and quenching and tempering treatment of mixed slag is carried out according to the following steps:

[0152] Step 1, smelting reduction:

[0153] (1) Material mixing and melting

[0154] Mix the ordinary blast furnace slag obtained from the blast furnace slag outlet with the converter steelmaking molten steel slag obtained from the steel slag outlet to obtain the mixed slag, and add it to the thermal insulation slag tank with graphite-dolomite composite thermal insulation refractory inside , then add coal powder and ordinary iron concentrate metallized pellets to obtain reaction mixed slag, spray into coal powder with a preheating temperature of 1200°C, heat to a molten state, and carry out smelting reduction to ensure that (a) and (b) Two parameters:

[0155] (a) The temperature of the reaction mixed slag is controlled at 1350-1600°C;

[0156] (b) Basicity CaO / SiO of reaction mixed slag 2 Ratio = 0.6 ~ 2.6;

[0157] Corr...

Embodiment 2

[0176] A method for smelting reduction production and quenching and tempering treatment of mixed slag is carried out according to the following steps:

[0177] Step 1, smelting reduction:

[0178] (1) Material mixing and melting

[0179] Mix the ordinary blast furnace slag obtained from the blast furnace slag outlet with the converter steelmaking molten steel slag obtained from the steel slag outlet to obtain the mixed slag, add it to the converter with carbon-magnesium composite thermal insulation refractory inside, and then Add bituminous coal and ordinary iron concentrate to directly reduce iron to obtain reaction mixed slag, spray into coal powder with a preheating temperature of 800°C, heat to a molten state, and carry out smelting reduction, and ensure both (a) and (b) through regulation and control parameter:

[0180] (a) The temperature of the reaction mixed slag is controlled at 1400~1600°C;

[0181] (b) Basicity CaO / SiO of reaction mixed slag 2 Ratio = 0.6 ~ 2.6;...

Embodiment 3

[0215] A method for smelting reduction production and quenching and tempering treatment of mixed slag is carried out according to the following steps:

[0216] Step 1, smelting reduction:

[0217] (1) Material mixing and melting

[0218] Mix the ordinary blast furnace slag obtained from the blast furnace slag outlet with the converter steelmaking molten steel slag obtained from the steel slag outlet to obtain the mixed slag, add it to the converter with asphalt-spinel composite thermal insulation refractory material inside, and then Add coal powder and ordinary iron concentrate carbon-containing pre-reduction pellets to obtain reaction mixed slag, spray into coal powder with a preheating temperature of 100°C, heat to a molten state, and perform smelting reduction. Ensure (a) and ( b) Two parameters:

[0219] (a) The temperature of the reaction mixed slag is controlled at 1400~1600°C;

[0220] (b) Basicity CaO / SiO of reaction mixed slag 2 Ratio = 0.6 ~ 2.6;

[0221] Corres...

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Abstract

The invention discloses a mixed slag smelting reduction production and thermal refining method, and belongs to the field of non-blast furnace iron smelting and comprehensive utilization of resources. The method comprises the following steps: 1) an iron-contained material and a reducing agent are added in mixed slag of blast furnace slag and molten steel slag for heating to reach a molten state; and oxide gas is sprayed for iron smelting by smelting reduction to treat most iron-contained material; and 2) an iron component, a calcium silicon component and a phosphorus component in the mixed slag are separated and recovered according to a reaction device. After smelting reduction, the reduced slag can serve as a cement additive, a cement regulator, a cement clinker or a cement clinker with high production additional value, so that the method realizes efficient comprehensive utilization of the resources, and is a new smelting reduction iron making method. The method uses smelting reduction of the mixed slag for production of pig iron or steel and phosphorus-enriched phases and thermal refining, is short in reaction time, high in metal recovery rate, low in production cost, high in raw material adaptability, high in handling quantity, environment-friendly and high in economic benefit, and can effectively achieve the goal of efficient recycling of metallurgic resources and heat energy.

Description

technical field [0001] The invention belongs to the field of non-blast furnace ironmaking and resource comprehensive utilization, and in particular relates to a method for smelting reduction production and quenching and tempering treatment of mixed slag. Background technique [0002] In today's world, the production of blast furnace ironmaking is developing unprecedentedly, the scale of blast furnace is expanding continuously, the production consumption of blast furnace is decreasing, and the cost is lowered. It is still the main force of steel production. Production encountered huge challenges, the details are as follows: [0003] (1) Blast furnace has a long production process from raw material pretreatment, pelletizing plant, sintering plant, coking plant, and blast furnace ironmaking, and the total investment is very huge; [0004] (2) Strong dependence on metallurgical coke. With the increasingly scarce coking coal resources, the price of metallurgical coke is getting...

Claims

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Application Information

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IPC IPC(8): C21B3/06C21B11/00C22B7/04C22B26/20
CPCC21B3/06C21B11/00C22B7/001C22B7/04C22B26/20Y02P10/20Y02W30/50
Inventor 张力张武
Owner NORTHEASTERN UNIV
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