Silica brick for hydrogen metallurgy natural gas-based shaft furnace and preparation method of silica brick

A natural gas and hydrogen metallurgy technology, applied in shaft furnaces, furnaces, furnace types, etc., can solve the problems of unfavorable longevity of silicon bricks for hydrogen metallurgy, poor gas corrosion performance, and structural damage of silicon bricks, and achieve excellent chemical stability, The effect of improving high temperature mechanical properties and prolonging service life

Pending Publication Date: 2022-07-15
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydrogen metallurgical production process contains a large amount of H 2 (g) and H 2 O(g), the CaO in the mineralizer easily reacts with H 2 O(g) reaction produces volume expansion and damages the silica brick; FeO is easily destroyed by H 2 Reduction to Fe causes structural damage of si

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1

[0027] A silica brick for hydrogen metallurgy natural gas-based shaft furnace and a preparation method thereof. The preparation method described in this example is:

[0028] Using 55-60wt% of silica particles, 25-30wt% of silica fine powder, 5-7wt% of silicon micropowder, 4-6wt% of lime milk and 4-6wt% of yttrium oxide as raw materials, mixing, and adding the Raw material 1-3wt% sulfite pulp waste liquid, kneading, pressing and forming, drying; then placed in a high-temperature furnace, heated to 1350-1390 ℃ at a rate of 22-30 ℃ / h, kept for 11-12 hours, and then prepared. Silica bricks for natural gas-based shaft furnaces in hydrogen dehydrogenation metallurgy.

[0029] The silica brick for hydrogen metallurgy natural gas-based shaft furnace prepared in this example has been tested: the softening temperature under load under the condition of 0.2MPa is 1680-1705°C; the compressive strength at room temperature is 95-110MPa; 2 -H 2 O mixed gas corrosion for...

Example Embodiment

[0030] Example 2

[0031] A silica brick for hydrogen metallurgy natural gas-based shaft furnace and a preparation method thereof. The preparation method described in this example is:

[0032] 59-65wt% of silica particles, 20-26wt% of silica fine powder, 4-6wt% of silicon micropowder, 3-5.5wt% of lime milk and 3.5-6wt% of yttrium oxide are used as raw materials, mixed, and then added with The 2-4 wt% sulfite pulp waste liquid of the raw material is mixed, pressed and formed, and dried; then placed in a high-temperature furnace, heated to 1370-1410 ℃ at a rate of 15-23 ℃ / h, and kept for 9-11 h, Silica bricks for hydrogen metallurgy natural gas-based shaft furnaces are prepared.

[0033] The silica brick for hydrogen metallurgy natural gas-based shaft furnace prepared in this example has been tested: the softening temperature under load under the condition of 0.2MPa is 1684-1700°C; the compressive strength at room temperature is 90-104MPa; 2 -H 2 O mixed gas corrosion for 10...

Example Embodiment

[0034] Example 3

[0035] A silica brick for hydrogen metallurgy natural gas-based shaft furnace and a preparation method thereof. The preparation method described in this example is:

[0036]Use 64-71wt% of silica particles, 18-23wt% of silica fine powder, 3-5.5wt% of silicon micropowder, 2.5-5wt% of lime milk and 2-5wt% of yttrium oxide as raw materials, mix, and then add The raw material 3-5wt% sulfite pulp waste liquid, kneading, pressing and molding, drying; then placed in a high-temperature furnace, heated to 1390-1430 ℃ at a rate of 28-38 ℃ / h, and kept for 8-10 h, Silica bricks for hydrogen metallurgy natural gas-based shaft furnaces are prepared.

[0037] The silica bricks for hydrogen metallurgy natural gas-based shaft furnaces prepared in this example have been tested: the softening temperature under load under the condition of 0.2MPa is 1688-1672°C; the compressive strength at room temperature is 68-95MPa; 2 -H 2 O mixed gas corrosion for 10h, the compressive st...

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Abstract

The invention relates to a silica brick for a hydrogen metallurgy natural gas-based shaft furnace and a preparation method of the silica brick. According to the technical scheme, 55-75 wt% of silica particles, 16-30 wt% of silica fine powder, 3-7 wt% of silica powder, 2-6 wt% of lime milk and 1-6 wt% of yttrium oxide serve as raw materials and are mixed, sulfurous acid paper pulp waste liquid accounting for 1-5 wt% of the raw materials is added, and mixing, compression molding and drying are conducted; and putting the mixture into a high-temperature furnace, heating to 1350-1450 DEG C at the speed of 15-45 DEG C/h, and preserving heat for 7-12 hours to obtain the silica brick for the hydrogen metallurgy natural gas-based shaft furnace. The prepared silica brick for the hydrogen metallurgy natural gas-based shaft furnace has the characteristics of high softening point under load, high strength, strong H2-H2O gas corrosion resistance and long service life, and is suitable for manufacturing iron in the hydrogen metallurgy natural gas-based shaft furnace by taking H2 or H2 + CO mixed gas as a reducing agent.

Description

technical field [0001] The invention belongs to the technical field of silica bricks for shaft furnaces. Specifically, it relates to a silica brick for hydrogen metallurgy natural gas-based shaft furnace and a preparation method thereof. Background technique [0002] Hydrogen metallurgy in the iron and steel industry is a technology that uses hydrogen to partially or completely replace carbon as a reducing agent for iron ore to obtain solid iron-containing materials at a temperature lower than the melting point of iron. H 2 The process of reducing iron ore has low temperature and no greenhouse gas emissions, which is of great significance to the healthy development of the steel industry in the direction of energy saving, emission reduction and green manufacturing. Compared with traditional coke-reduced iron ore, the service environment of refractory materials for hydrogen metallurgy has undergone great changes, but H 2 Reduction of iron ore produces water vapor, high temp...

Claims

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Application Information

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IPC IPC(8): C04B35/14C04B35/622C04B35/66C21B13/02
CPCC04B35/14C04B35/622C04B35/66C21B13/0073C21B13/02C04B2235/3208C04B2235/3225C04B2235/6562C04B2235/6567C04B2235/5427C04B2235/5436C04B2235/5445C04B2235/96C04B2235/9607C04B2235/9669
Inventor 顾华志陈定黄奥张美杰李少飞
Owner WUHAN UNIV OF SCI & TECH
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