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Preparation method of high-content metallized agglomerate for blast furnace

A technology of metallization and agglomeration, which is applied in the field of iron and steel metallurgy, can solve the problems such as the indistinct effect of passivating agents, and achieve the effects of broad industrial application prospects, good mechanical strength, and less pollution

Active Publication Date: 2018-09-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some researchers proposed to slow down coke gasification by adding passivation agent to coke, but the effect of passivation agent is not obvious.

Method used

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  • Preparation method of high-content metallized agglomerate for blast furnace
  • Preparation method of high-content metallized agglomerate for blast furnace
  • Preparation method of high-content metallized agglomerate for blast furnace

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preparation example Construction

[0032] Such as figure 1 As shown, a method for preparing high-carbon metallized agglomerates for blast furnaces specifically includes the following steps:

[0033] Step 1. Preparation of ultra-fine iron ore powder: using iron ore concentrate materials with a total iron content of more than 60 wt%, after crushing and fully ball milling the iron ore concentrate, the average particle size of the obtained ore powder is 1-5 μm.

[0034] Step 2: Preparation of coal powder: taking weakly caking coal and anthracite as raw materials, crushing the coal sample with a crusher and a ball mill, ball milling and mixing thoroughly, the average particle size of the resulting mixed coal powder is 50-100 μm.

[0035] Step 3: Mixing and briquetting of raw materials: The prepared ultrafine iron ore powder and coal powder are mixed in a certain proportion, and the mixed materials are mixed with a certain proportion of organic binder and water before using a roller ball press Compressed into agglomerates w...

Embodiment 1

[0051] [1]. Preparation of ultrafine iron ore powder: The chemical analysis results of the iron concentrate used are shown in Table 1. After taking 600 g of iron concentrate, crushing and fully ball milling the iron concentrate sample, the average particle size of the obtained ore powder is 2.88 μm.

[0052] [2]. Coal powder preparation: The industrial analysis results of the bituminous coal used are shown in Table 2, and the industrial analysis results of the anthracite coal used are shown in Table 3. Take 150g of the above-mentioned bituminous coal and 150g of the above-mentioned anthracite. After crushing, ball milling and mixing the two coal samples, the average particle size of the mixed coal powder obtained is 60 μm.

[0053] [3]. Mixing and briquetting of raw materials: the above-mentioned iron ore powder and mixed coal powder are thoroughly mixed. The mixed materials are made into agglomerates with a diameter of Φ15mm×15mm. The mass of each agglomerate is 5-6g. The ball...

Embodiment 2

[0058] [1]. Preparation of ultrafine iron ore powder: The chemical analysis results of the iron concentrate used are shown in Table 1. Take 600g of iron concentrate sample, and after preliminary crushing and full ball milling of the iron concentrate sample, the average particle size of the obtained iron ore powder is 3.56μm.

[0059] [2]. Coal powder preparation: The industrial analysis results of the bituminous coal used are shown in Table 2, and the industrial analysis results of the anthracite coal used are shown in Table 3. Take 200g of the above-mentioned bituminous coal and 200g of the above-mentioned anthracite. After crushing, ball milling and mixing the two coal samples, the average particle size of the mixed coal powder obtained is 60 μm.

[0060] [3]. Mixing and briquetting of raw materials: the above-mentioned iron ore powder and mixed coal powder are thoroughly mixed. The mixed materials are pressed into agglomerates of Φ15mm×15mm. The mass of each agglomerate is 5-...

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Abstract

The invention discloses a preparation method of high-content metallized agglomerate for a blast furnace and belongs to the technical field of iron making. Raw materials are composed of ultrafine ironconcentrate powder, anthracite smalls and weak-caking bituminous dust, wherein the average particle size of iron ore powder is 1-5 [mu]m, and the average particle size of mixed coal dust is 50-100 [mu]m. After the raw materials are fully mixed, an organic binding agent and water are added at a certain proportion, and the mixture is pressed by a ball pressing machine to form raw agglomerate; and the raw agglomerate is roasted according to certain temperature rules under the condition of air isolation or N2 shielding, so that the high-content metallized agglomerate is obtained. The carbon content of the high-content metallized agglomerate is 20-40 wt%, and the high-content metallized agglomerate has good cold strength, post-reaction crush resistance and great CO2 reactivity. In production ofthe blast furnace, by adding the high-content metallized agglomerate to an iron-containing ore material layer at a proper proportion, the coke ratio and energy consumption of the blast furnace are reduced advantageously, and meanwhile ventilation of the blast furnace is not affected. As a carbon source of the high-content metallized agglomerate is weak-caking bituminous coal and anthracite, usageof noncaking coal in blast furnace ironmaking is extended advantageously, and the dependence of blast furnace ironmaking on coke is reduced.

Description

Technical field [0001] The invention belongs to the field of iron and steel metallurgy, and relates to a method for preparing high-carbon metallized agglomerates for blast furnace ironmaking. Background technique [0002] Blast furnace ironmaking is the world's main molten iron production process. In terms of improving the operating efficiency of blast furnaces and controlling the quality of molten iron, coke is the most important raw material for blast furnaces. Coke constitutes the main part of the production cost of molten iron. Due to the lack of coking coal resources and coking is a highly polluting industry, low coke ratio ironmaking technology has always been an important research content of blast furnace ironmaking. [0003] In blast furnace ironmaking, coke has the following three functions, namely: thermal function, as a fuel to provide heat for chemical reactions and molten iron and slag; chemical function, as a reducing agent to provide reducing gas for reducing iron-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/245C22B1/02C21B5/00
CPCC21B5/008C22B1/02C22B1/2406C22B1/245
Inventor 唐惠庆柳仕宏贠志伟薛庆国王劲松
Owner UNIV OF SCI & TECH BEIJING