Bauxite base slight expansion high-alumina brick for ladle and method for producing the same

Abstract

The invention relates to a bauxite-based slight expansive high-alumina brick for ladles and a preparation method thereof and the material components and weight percentage are as follows: bauxite clinker between 5mm to 3mm accounting for 10 percent to 15 percent, bauxite clinker between 3mm to 1mm accounting for 20 percent to 30 percent, bauxite clinker between 1mm to 0mm accounting for10 percent to 20 percent, andanlusite less than 0.5mm accounting for 0 to 20 percent, sillimanite less than 0.088mm accounting for 0 to 15 percent, kyanite less than 0.2mm accounting for 0 to 10 percent, bauxite clinker less than 0.088mm accounting for 20 percent to 40 percent, Alpha-Al2O3 less than 320 mesh accounting for 0 to 5 percent and applied sulfurous acid paper pulp waste liquid accounting for 3 percent to 5 percent. The preparation method comprises the following steps: a. the bauxite clinker is crushed; b. the powders are magnetically selected; c. calendering is carried out on the bauxite clinker, the andanlusite, the sillimanite, the kyanite, the Alpha-Al2O3 and the applied sulfurous acid paper pulp waste liquid after mixing according to a ratio; d. the pug after calendering is shaped; e. the shaped pug is dried for 48hours; and f. the pug is sintered at the temperature of 1500 DEG C and the temperature is preserved for 6 to 8 hours. The preparation method can leads to the slight expansion of high-alumina bricks in use to avoid the flaking of bricks and the service life of bricks can be improved by 30 percent to 50 percent.

Description

technical field

[0001] The invention belongs to a refractory material, in particular to an alumina-based micro-expansion high-alumina brick for a ladle and a manufacturing method thereof. Background technique

[0002] Ladle is a kind of thermal equipment that receives molten steel from upstream steelmaking furnaces and transports molten steel to the refining equipment outside the furnace or the steel pouring site. With the development of refining outside the furnace, many molten steel refining processes are carried out in ladles. It makes the conditions of ladle use worse. The requirements for furnace lining refractory materials are even higher. Therefore, in order to adapt to the use conditions of the ladle and the requirements of users, after analyzing the original ladle brick system, it is found that the main problem causing the decline in the life of the ladle is that the original high alumina brick products are in use. The volume shrinkage will cause the brick joint to...

Examples

Embodiment 1

[0025] An alumina-based micro-expansion high-alumina brick for a ladle, its raw material components and weight percentages are:

[0026] 5-3mm high bauxite clinker 10%, 3-1mm high bauxite clinker 20%,

[0027] 10% of high alumina bauxite clinker of 1-0mm, 18% of andalusite less than 0.5mm,

[0028] 12% of sillimanite less than 0.088mm, 10% of kyanite less than 0.2mm,

[0029] 20% of high alumina bauxite clinker less than 0.088mm, plus 2% of sulfurous acid pulp waste liquid.

Embodiment 2

[0031] An alumina-based micro-expansion high-alumina brick for a ladle, its raw material components and weight percentages are:

[0032] 5-3mm high bauxite clinker 15%, 3-1mm high bauxite clinker 29%,

[0033] 1-0mm high alumina bauxite clinker 20%, less than 0.5mm andalusite 6%,

[0034] Kyanite less than 0.2mm 5%, high alumina clinker less than 0.088mm 20%,

[0035] α-Al less than 320 mesh 2 o 3 5%, plus 2% sulfurous acid pulp waste liquor.

Embodiment 3

[0037] An alumina-based micro-expansion high-alumina brick for a ladle, its raw material components and weight percentages are:

[0038] 5-3mm high bauxite clinker 12%, 3-1mm high bauxite clinker 22%,

[0039] 15% of high alumina bauxite clinker of 1-0mm, 6% of andalusite less than 0.5mm,

[0040] 5% sillimanite smaller than 0.088mm, 8% kyanite smaller than 0.2mm,

[0041] 27% of high alumina bauxite clinker less than 0.088mm, α-Al less than 320 mesh 2 o 3 5%,

[0042] Add 5% of sulfurous acid pulp waste liquid.

[0043] The manufacture method of bauxite-based micro-expansion high-alumina brick for ladle described in above three kinds of embodiments, its steps are as follows:

[0044] a. Pulverizing the high alumina bauxite clinker;

[0045] b. Magnetically separate the powder;

[0046] c. Mix high alumina bauxite clinker, andalusite, sillimanite, kyanite, α-Al 2 o 3 Mixing with external sulfurous acid pulp waste liquid in proportion;

[0047] d. Forming the mud aft...

technical field

[0001] The invention belongs to a refractory material, in particular to an alumina-based micro-expansion high-alumina brick for a ladle and a manufacturing method thereof. Background technique

[0002] Ladle is a kind of thermal equipment that receives molten steel from upstream steelmaking furnaces and transports molten steel to the refining equipment outside the furnace or the steel pouring site. With the development of refining outside the furnace, many molten steel refining processes are carried out in ladles. It makes the conditions of ladle use worse. The requirements for furnace lining refractory materials are even higher. Therefore, in order to adapt to the use conditions of the ladle and the requirements of users, after analyzing the original ladle brick system, it is found that the main problem causing the decline in the life of the ladle is that the original high alumina brick products are in use. The volume shrinkage will cause the brick joint to...

Examples

Embodiment 1

[0025] An alumina-based micro-expansion high-alumina brick for a ladle, its raw material components and weight percentages are:

[0026] 5-3mm high bauxite clinker 10%, 3-1mm high bauxite clinker 20%,

[0027] 10% of high alumina bauxite clinker of 1-0mm, 18% of andalusite less than 0.5mm,

[0028] 12% of sillimanite less than 0.088mm, 10% of kyanite less than 0.2mm,

[0029] 20% of high alumina bauxite clinker less than 0.088mm, plus 2% of sulfurous acid pulp waste liquid.

Embodiment 2

[0031] An alumina-based micro-expansion high-alumina brick for a ladle, its raw material components and weight percentages are:

[0032] 5-3mm high bauxite clinker 15%, 3-1mm high bauxite clinker 29%,

[0033] 1-0mm high alumina bauxite clinker 20%, less than 0.5mm andalusite 6%,

[0034] Kyanite less than 0.2mm 5%, high alumina clinker less than 0.088mm 20%,

[0035] α-Al less than 320 mesh 2 o 3 5%, plus 2% sulfurous acid pulp waste liquor.

Embodiment 3

[0037] An alumina-based micro-expansion high-alumina brick for a ladle, its raw material components and weight percentages are:

[0038] 5-3mm high bauxite clinker 12%, 3-1mm high bauxite clinker 22%,

[0039] 15% of high alumina bauxite clinker of 1-0mm, 6% of andalusite less than 0.5mm,

[0040] 5% sillimanite smaller than 0.088mm, 8% kyanite smaller than 0.2mm,

[0041] 27% of high alumina bauxite clinker less than 0.088mm, α-Al less than 320 mesh 2 o 3 5%,

[0042] Add 5% of sulfurous acid pulp waste liquid.

[0043] The manufacture method of bauxite-based micro-expansion high-alumina brick for ladle described in above three kinds of embodiments, its steps are as follows:

[0044] a. Pulverizing the high alumina bauxite clinker;

[0045] b. Magnetically separate the powder;

[0046] c. Mix high alumina bauxite clinker, andalusite, sillimanite, kyanite, α-Al 2 o 3 Mixing with external sulfurous acid pulp waste liquid in proportion;

[0047] d. Forming the mud aft...