Refractory brick and preparation method thereof

A technology of refractory bricks and bauxite, which is applied in the field of refractory materials, can solve problems such as rotation, loose refractory bricks, unplanned maintenance of rotary kilns, etc., and achieve the effect of small sintering shrinkage and good refractory performance

Inactive Publication Date: 2017-09-08
攀钢冶金材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rotary kiln is a kind of equipment that rotates for a long time during operation. If the lining refractory material shrinks, the refractory bricks will often loosen, and then turn around, causing unplanned maintenance of the rotary kiln and reducing the operating rate of the rotary kiln.

Method used

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  • Refractory brick and preparation method thereof
  • Refractory brick and preparation method thereof
  • Refractory brick and preparation method thereof

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preparation example Construction

[0030] The present invention provides a kind of preparation method of the refractory brick described in the above technical solution, comprising:

[0031] Alumina, mullite, silica powder, metal silicon, ferrosilicon, Al 2 o 3 , sodium phosphate and water are mixed to obtain a mixture;

[0032] The mixture is made into bricks and then dried to obtain refractory bricks.

[0033] In the present invention, the alumina, mullite, silicon micropowder, metal silicon, ferrosilicon, Al 2 o 3 , sodium phosphate and their consumption are consistent with the above-mentioned technical scheme, no longer repeat them here.

[0034] In the present invention, the preparation method of the mixture is preferably:

[0035] Mullite, silica powder, metal silicon, ferrosilicon, Al 2 o 3 mixed with sodium phosphate to obtain a mixture;

[0036] Alumina is mixed with water to obtain aggregate;

[0037] The mixture is mixed with aggregate to obtain a mixture.

[0038] In the present invention, ...

Embodiment 1

[0045] The raw material composition and dosage of refractory bricks are: bauxite 6-2mm 30wt%, bauxite 2-0mm 35wt%, bauxite particle size ≤ 200 mesh (indicating that it can pass through the 200 mesh mesh, that is, the particle size is less than 74 microns) fine powder 15wt %; Mullite ≤ 200 mesh (indicating that it can pass through the 200 mesh mesh, that is, the particle size is less than 74 microns) fine powder 5wt%, silica fume 1wt%, ferrosilicon powder 5wt%, α-Al 2 o 3 Micropowder 6wt%, metal silicon 1wt%, sodium hexametaphosphate 2wt%, the total amount of the above raw materials is 100%.

[0046] Mullite, silica fume, ferrosilicon powder, α-Al 2 o 3 Micropowder, metal silicon and sodium hexametaphosphate are put into the pre-mixer and mixed for 10-15 minutes, and the mixed powder is discharged for use, and then the super-grade bauxite granular aggregate is poured into the mud mill in proportion, and mixed for 2-3 minutes. Minutes later, add bauxite mass of 3-4wt% water t...

Embodiment 2

[0051] The raw material composition and dosage of refractory bricks are: bauxite 6-2mm 30wt%, bauxite 2-0mm 35wt%, bauxite particle size ≤ 200 mesh (indicating that it can pass through the 200 mesh mesh, that is, the particle size is less than 74 microns) fine powder 10wt %; 10wt% of fine powder of mullite≤200 mesh (indicating that it can pass through the 200 mesh, that is, the particle size is less than 74 microns), 1wt% of silica fume, 5wt% of ferrosilicon powder, α-Al 2 o 3 Micropowder 6wt%, metal silicon 1wt%, sodium tripolyphosphate 2wt%, the total amount of the above raw materials is 100%.

[0052] Mullite, silica fume, ferrosilicon powder, α-Al 2 o 3 Micropowder, metal silicon and sodium tripolyphosphate are put into the pre-mixer in proportion and mixed for 10-15 minutes, and then the mixed powder is discharged for use, and then the super-grade bauxite granular aggregate is poured into the mud mill in proportion, and mixed for 2-3 minutes. Minutes later, add bauxite...

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Abstract

The invention provides a refractory brick. The refractory brick is prepared from alumina, mullite, silica powder, silicon metal, silicon iron, Al2O3 and sodium phosphate. Compared with the prior art, alumina, mullite, Al2O3 and other main raw materials in the refractory brick have good refractory properties, weakly react with sodium salt at the use temperature and are not prone to excessive sintering or over-sintering; the refractory brick contains silicon metal and silicon iron, so that oxidation appears at the use temperature, and certain volume expansion can be generated, and contraction caused by sintering can be partly counteracted. Under the combined action of the various raw materials, the refractory brick has little sintering contraction when slag of vanadium and chromium is calcined for sodium modification. The invention further provides a preparation method of the refractory brick.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a refractory brick and a preparation method thereof. Background technique [0002] Panzhihua Hongge Deposit vanadium-titanium magnetite is one of the four major mines in Panxi area, with a reserve of about 3.6 billion tons. It is a high-chromium vanadium-titanium magnetite with great development value. The ore is characterized by high chromium content and relatively low vanadium and titanium content. After smelting and separation, vanadium-chromium enters the slag in the form of oxides, and the slag is referred to as vanadium-chromium slag. However, the separation and extraction technology of vanadium and chromium in vanadium and chromium slag is a common technical problem at home and abroad. After repeated demonstrations, Panzhihua Iron and Steel believes that the use of rotary kiln roasting is an effective method. If it is an ordinary mineral material, the rotary...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/101C04B35/622
CPCC04B35/101C04B35/622C04B2235/3201C04B2235/3418C04B2235/3463C04B2235/405C04B2235/428C04B2235/447C04B2235/608C04B2235/96C04B2235/9607
Inventor 段大福段晓东杨强陈桂英万红伶李冬梅李阳王怀斌郭强
Owner 攀钢冶金材料有限责任公司
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