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
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[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...
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[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...
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[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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