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Heat pressing burnt carbon brick for lining and hearth of iron smelting blast furnace

An iron-making blast furnace and carbon brick technology, which is applied in the field of refractory materials, can solve the problems of limited life of iron-making blast furnace, low brick quality, low production efficiency, etc. Effect

Active Publication Date: 2006-03-29
河南远洋新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The carbon bricks currently used for the lining and hearth of iron-making blast furnaces are limited by the firing process, so the quality of the bricks is not high. The thermal conductivity of the finished product is generally 14W / m.k (600°C) and the air permeability is 10mDa. It directly leads to the limited life of the ironmaking blast furnace; while the traditional firing process is basically in accordance with: selection of raw materials - crushing - grinding - ingredients - kneading - pressing - roasting - processing, in the pressing - roasting In the process of completing these two processes, the time spent is as long as more than 20 days, so the energy consumption is greatly increased, and the production efficiency is low and the production cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The hot-pressed fired charcoal brick of the present invention can be prepared according to the following weight percentage proportions and steps:

[0036] a. Weight percentage ratio:

[0037] Electric calcined anthracite 20, natural graphite 30, artificial graphite 30,

[0038] Silicon metal 1, silicon oxide 1, aluminum oxide 3, high temperature asphalt 15;

[0039] b. Preparation steps:

[0040] In the first step, the above-mentioned raw materials are crushed and pulverized, and then mixed and proportioned;

[0041] The second step is to take the mixed powder obtained in the first step and knead it, put it into a molding mold, and keep it under a pressure of 3Mpa for 1 minute to obtain a pre-pressed carbon brick;

[0042] The third step is to heat the pre-pressed carbon brick in the second step to 800°C in the forming mold and pressurize it to 30Mpa. After keeping it for 8 minutes, take it out and process it according to the conventional method.

Embodiment 2

[0044] The hot-pressed fired charcoal bricks of the present invention can also be prepared according to the following weight percentage proportions and steps:

[0045] a. Weight percentage ratio:

[0046] Electric calcined anthracite 50, natural graphite 20, artificial graphite 10, metal silicon 2, silicon oxide 3, aluminum oxide 5, high-temperature pitch 10;

[0047] b. Preparation steps:

[0048] In the first step, the above-mentioned raw materials are crushed and pulverized, and then mixed and proportioned;

[0049] In the second step, after kneading the mixed powder obtained in the first step, put it into a forming mold, and keep it for 1.5 minutes under a pressure of 5Mpa to obtain a pre-pressed carbon brick;

[0050] The third step is to heat the pre-pressed carbon brick in the second step to 1000°C in the forming mold and pressurize it to 40Mpa. After keeping it for 9 minutes, take it out and process it according to the conventional method.

Embodiment 3

[0052] The hot-pressed fired charcoal brick of the present invention can also be prepared according to the following weight percentage proportions and steps:

[0053] a. Weight percentage ratio:

[0054] Electric calcined anthracite 30, natural graphite 10, artificial graphite 20, metal silicon 5, silicon oxide 5, aluminum oxide 10, high-temperature pitch 20;

[0055] b. Preparation steps:

[0056] In the first step, the above-mentioned raw materials are crushed and pulverized, and then mixed and proportioned;

[0057] In the second step, after kneading the mixed powder obtained in the first step, put it into a forming mold, and keep it for 2 minutes under a pressure of 7Mpa to obtain a pre-pressed carbon brick;

[0058] The third step is to heat the pre-pressed carbon brick in the second step to 1100°C in the forming mold and pressurize it to 50Mpa. After keeping it for 10 minutes, take it out and process it according to the conventional method.

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PUM

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Abstract

A carbon brick used for the liner and inner box of blast furnace is proportionally prepared from electrically calcined anthracite, natural graphite, artificial graphite, metallic silicon, silicon oxide, aluminium oxide and high-temp asphalt through crushing, grinding, proportional mixing, kneading, loading it in mould, pressing for shaping, electric heating at 800-1100 deg.C while pressing under 30-50 MPa, and conventional trimming. Its advantage is short calcining time.

Description

technical field [0001] The invention relates to a refractory material, in particular to a hot-pressed fired charcoal brick used for lining and hearth of an ironmaking blast furnace. Background technique [0002] The carbon bricks currently used for the lining and hearth of iron-making blast furnaces are limited by the firing process, so the quality of the bricks is not high. The thermal conductivity of the finished product is generally 14W / m.k (600°C) and the air permeability is 10mDa. It directly leads to the limited life of the ironmaking blast furnace; while the traditional firing process is basically in accordance with: selection of raw materials - crushing - grinding - ingredients - kneading - pressing - roasting - processing, in the pressing - roasting It takes more than 20 days to complete these two processes, which greatly increases energy consumption, and the production efficiency is low and the production cost is high. Contents of the invention [0003] The purp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B7/04C04B33/00
Inventor 白周成向左良刘欣荣宋木森白周京白海钦白小丽孟瑞杰
Owner 河南远洋新材料技术有限公司
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