CN1293207C - Heat pressing burnt carbon brick for lining and hearth of iron smelting blast furnace - Google Patents

Abstract

The invention discloses a hot-pressed fired charcoal brick for ironmaking blast furnace lining and hearth, which is prepared according to the following weight percentage ratio and steps: a. Weight percentage ratio: electric calcined anthracite 20-50 , natural graphite 10-30, artificial graphite 10-30, metal silicon 1-5, silicon oxide 1-5, aluminum oxide 3-10, high-temperature pitch 10-20; b, preparation steps: the first step, the above raw materials are crushed 1. Mix the ingredients after grinding; in the second step, take the mixed powder obtained in the first step and knead it, put it into the molding mold, and keep it for 1-2 minutes under the pressure of 3-7MPa to obtain the pre-pressed Carbon brick; the third step is to heat the pre-pressed carbon brick in the second step to 800-1100°C in the forming mold and pressurize it to 30-50MPa, keep it for 8-10 minutes, take it out and process it according to the conventional method Instantly. The advantage of the present invention is that the two steps of molding-roasting in the traditional production process are combined into one, the firing time is shortened within 10 minutes, and the energy consumption for producing carbon bricks is greatly reduced.

Description

Hot-pressed fired carbon bricks for furnace linings and hearths of ironmaking blast furnaces

technical field

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

The carbon bricks currently used for the lining and hearth of ironmaking blast furnaces are limited by the firing process, so the quality of the bricks is not high. The thermal conductivity of the finished products is generally 14W/(m.k)(600℃), and the air permeability is 10mDa. This 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 - batching - kneading - pressing - roasting - processing, in the pressing - Roasting and firing are the 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.

Contents of the invention

The purpose of the present invention is to provide a hot-pressed fired carbon brick for ironmaking blast furnace lining and hearth with short processing time and high product quality.

To achieve the above object, the present invention can take the following technical solutions:

The hot-pressed charcoal brick used for ironmaking blast furnace lining and hearth of the present invention is made of electric calcined anthracite, natural graphite, artificial graphite, metal silicon, silicon oxide, aluminum oxide, and high-temperature pitch as follows Prepared by weight percentage ratio and steps:

a. Weight percentage ratio:

Electric calcined anthracite 20-50, natural graphite 10-30, artificial graphite 10-30, metal silicon 1-5, silicon oxide 1-5, aluminum oxide 3-10, high temperature pitch 10-20;

b. Preparation steps:

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

The second step is to take the mixed powder obtained in the first step, knead it, put it into a molding mold, and keep it under a pressure of 3-7MPa for 1-2 minutes to obtain a pre-pressed carbon brick;

The third step is to heat the pre-pressed carbon brick in the second step to 800-1100°C in the forming mold and pressurize it to 30-50 MPa, keep it for 8-10 minutes, take it out and process it according to the conventional method.

The hot-pressed fired charcoal bricks can be prepared according to the following weight percentage proportions and steps:

a. Weight percentage ratio:

Electric calcined anthracite 20, natural graphite 30, artificial graphite 30, metal silicon 1, silicon oxide 1, aluminum oxide 3, high-temperature pitch 15;

b. Preparation steps:

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

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;

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.

The hot-pressed fired charcoal bricks can also be prepared according to the following weight percentage proportions and steps:

a. Weight percentage ratio:

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

b. Preparation steps:

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

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 for 1.5 minutes under a pressure of 5 MPa to obtain a pre-pressed carbon brick;

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.

The hot-pressed fired charcoal brick can also be prepared according to the following weight percentage proportions and steps:

a. Weight percentage ratio:

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

b. Preparation steps:

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

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 for 2 minutes under a pressure of 7 MPa to obtain a pre-pressed carbon brick;

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.

The advantage of the present invention is that it adopts a scientific carbon brick ratio, and combines the two steps of molding-roasting in the traditional production process into one, that is, directly feeds the carbon brick on the basis of pre-pressing Electric heating and simultaneous pressurization make the product fired quickly at high temperature under high pressure, shortening the firing time to less than 10 minutes, which not only greatly shortens the production cycle of carbon conversion, but also greatly reduces the energy consumption of carbon brick production. And reduced the porosity and air permeability of the finished carbon brick, improved the thermal conductivity of the carbon brick, the thermal conductivity and the air permeability of the finished carbon brick produced according to the present invention are respectively 26W/(m.k) (600 ℃) and 2.97 mDa, while the thermal conductivity and air permeability of existing finished carbon bricks are 14W/(m.k)(600°C) and 10mDa respectively. Therefore, the quality of the finished carbon brick is greatly improved, and the service life of the ironmaking blast furnace is prolonged.

Detailed ways

Example 1:

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

a. Weight percentage ratio:

Electric calcined anthracite 20, natural graphite 30, artificial graphite 30,

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

b. Preparation steps:

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

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;

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.

Example 2:

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

a. Weight percentage ratio:

Electric calcined anthracite 50, natural graphite 20, artificial graphite 10,

Silicon metal 2, silicon oxide 3, aluminum oxide 5, high temperature asphalt 10;

b. Preparation steps:

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

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 for 1.5 minutes under a pressure of 5 MPa to obtain a pre-pressed carbon brick;

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.

Example 3:

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

a. Weight percentage ratio:

Electric calcined anthracite 30, natural graphite 10, artificial graphite 20,

Silicon metal 5, silicon oxide 5, aluminum oxide 10, high temperature asphalt 20;

b. Preparation steps:

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

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 for 2 minutes under a pressure of 7 MPa to obtain a pre-pressed carbon brick;

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.

Claims (4)

1, a kind of heat pressing burnt carbon brick that is used for ironmaking blast furnace lining, cupola well is characterized in that: it is to be prepared from according to following weight per distribution ratio and step by raw material electric calcined anthracite, natural graphite, synthetic graphite, Pure Silicon Metal, silicon oxide, aluminum oxide, hard pitch:

A, weight percent proportioning:

Electric calcined anthracite 20-50, natural graphite 10-30, synthetic graphite 10-30, Pure Silicon Metal 1-5, silicon oxide 1-5, aluminum oxide 3-10, hard pitch 10-20;

B, preparation process:

The first step will be carried out mix behind above-mentioned raw materials fragmentation, the abrasive dust;

In second step, the mixed powder of getting the first step gained in the forming mould of packing into, under the pressure of 3-7MPa, kept 1-2 minute after mixed pinching, and obtained the brick fuel of pre-molding;

In the 3rd step, the brick fuel of the second step pre-molding switch in forming mould is forced into 30-50MPa when being heated to 800-1100 ℃, keeps after 8-10 minute, and taking-up shapes promptly according to a conventional method.

2, heat pressing burnt carbon brick according to claim 1 is characterized in that: be prepared from according to following weight per distribution ratio and step:

A, weight percent proportioning:

Electric calcined anthracite 20, natural graphite 30, synthetic graphite 30, Pure Silicon Metal 1, silicon oxide 1, aluminum oxide 3, hard pitch 15;

B, preparation process:

The first step will be carried out mix behind above-mentioned raw materials fragmentation, the abrasive dust;

In second step, the mixed powder of getting the first step gained in the forming mould of packing into, under the pressure of 3MPa, kept 1 minute after mixed pinching, and obtained the brick fuel of pre-molding;

In the 3rd step, the brick fuel of the second step pre-molding switch in forming mould is forced into 30MPa when being heated to 800 ℃, keeps after 8 minutes, and taking-up shapes promptly according to a conventional method.

3, heat pressing burnt carbon brick according to claim 1 is characterized in that: be prepared from according to following weight per distribution ratio and step:

A, weight percent proportioning:

Electric calcined anthracite 50, natural graphite 20, synthetic graphite 10, Pure Silicon Metal 2, silicon oxide 3, aluminum oxide 5, hard pitch 10;

B, preparation process:

The first step will be carried out mix behind above-mentioned raw materials fragmentation, the abrasive dust;

In second step, the mixed powder of getting the first step gained in the forming mould of packing into, under the pressure of 5MPa, kept 1.5 minutes after mixed pinching, and obtained the brick fuel of pre-molding;

In the 3rd step, the brick fuel of the second step pre-molding switch in forming mould is forced into 40MPa when being heated to 1000 ℃, keeps after 9 minutes, and taking-up shapes promptly according to a conventional method.

4, heat pressing burnt carbon brick according to claim 1 is characterized in that: be prepared from according to following weight per distribution ratio and step:

A, weight percent proportioning:

Electric calcined anthracite 30, natural graphite 10, synthetic graphite 20, Pure Silicon Metal 5, silicon oxide 5, aluminum oxide 10, hard pitch 20;

B, preparation process:

The first step will be carried out mix behind above-mentioned raw materials fragmentation, the abrasive dust;

In second step, the mixed powder of getting the first step gained in the forming mould of packing into, under the pressure of 7MPa, kept 2 minutes after mixed pinching, and obtained the brick fuel of pre-molding;

In the 3rd step, the brick fuel of the second step pre-molding switch in forming mould is forced into 50MPa when being heated to 1100 ℃, keeps after 10 minutes, and taking-up shapes promptly according to a conventional method.