CN107120972A

CN107120972A - A kind of electrical kiln refractory brick of light thermal-insulation

Info

Publication number: CN107120972A
Application number: CN201710506275.6A
Authority: CN
Inventors: 周迪
Original assignee: Changxin Xin Di Refractory Material Factory
Current assignee: Changxin Xin Di Refractory Material Factory
Priority date: 2017-06-28
Filing date: 2017-06-28
Publication date: 2017-09-01

Abstract

The invention discloses a kind of refractory brick attachment structure, belong to kiln heat-insulation layer technical field, including two refractory brick side and be arranged on the connecting portions of two sides；The side of wherein refractory brick is provided with cement face and the expanded graphite neck adjacent with the cement face, when forming packing structure, and the cement face is located at the outside of furnace insulation layer, and the expanded graphite neck is located at the inner side of furnace insulation layer；Connecting portion includes paving the cement connecting layer on the cement face and the expanded graphite card article being connected in the expanded graphite neck.It overcomes the sealing thermal insulation problem that cement shrinkage is brought well, in turn ensure that the fastness and stability of attachment structure.

Description

A kind of electrical kiln refractory brick of light thermal-insulation

Technical field

The present invention relates to technical field of refractory materials, in particular to a kind of electrical kiln refractory brick of light thermal-insulation.

Background technology

Electrical kiln is one kind of kiln, and it is used as heating group using electric furnace heating wire, silicon-carbon side or molybdenum disilicide mostly using electricity as the energy Part, oxidizing atmosphere firing is carried out by electric energy radiation and heat conduction principle, and electronic program regulation and control are simple to operate, have a safety feature, fit For various workplaces.

Existing electrical kiln generally piles up the outer wall to be formed as heat-insulation layer using fire resisting station, and thing to be sintered is placed in it and added Heat is fired, and existing refractory brick generally uses solid brick body, is sintered and formed after mixing with various materials, its heat-insulating property is determined The energy consumption of electrical kiln heat generating component is determined, heat-insulating property is better, then the energy consumption of heat generating component is lower, has been conducive to saving and fires cost.

And how the thermal conductivity of existing refractory brick further lifts electrical kiln resistance to generally in the range of 2.3 ~ 2.8W/mK The heat-insulating property of firebrick packing structure, which is needed badly, to be studied and is broken through.

The content of the invention

In order to overcome the above-mentioned deficiencies of the prior art, the invention provides a kind of electrical kiln refractory brick of light thermal-insulation, its Weight is compared to more lightweight, better heat preservation for existing refractory brick, while ensure that compressive resistance, loading softening temperature The performance indications such as degree and thermal shock resistance are maintained at outstanding level.

The electrical kiln refractory brick of a kind of light thermal-insulation, by fine and close supporting layer and porous heat-insulation layer institute combined with it Constitute；

When piling up electrical kiln, the supporting layer constitutes the outer layer of refractory brick packing structure, and the heat-insulation layer constitutes refractory brick and piles up knot The nexine of structure；

The porosity of the supporting layer is 0% ~ 5%, and the porosity of the heat-insulation layer is 5% ~ 45%.

Air has very low thermal conductivity as the non-conductor of heat, therefore, the hole containing air is formed in refractory brick Gap layer can greatly enhance its heat-insulating property, at the same time, retain supporting layer to provide intensity and the heat resistanceheat resistant required for refractory brick Shock stability, makes it have suitable competitiveness for like product.

As the preferred of above-mentioned technical proposal, the supporting layer is the sintered rear compacted zone formed.

As the preferred of above-mentioned technical proposal, the thickness of the supporting layer accounts for the 18% ~ 22% of the refractory brick thickness.

As the preferred of above-mentioned technical proposal, the heat-insulation layer includes several according to the order of porosity from small to large The minimum layering of layering, wherein porosity is adjacent with the supporting layer.

As the preferred of above-mentioned technical proposal, the quantity of the layering is 2 ~ 4 layers.

As the preferred of above-mentioned technical proposal, the quantity of the layering is 3 layers.

As the preferred of above-mentioned technical proposal, the layering is respectively according to the order apart from the supporting layer from the near to the remote First layer, second layering positioned at centre and away from the supporting layer farthest threeth layering adjacent with the supporting layer；

The porosity of the first layer is 8% ~ 12%, and the porosity of second layering is 15% ~ 20%, the 3rd layering Porosity is 22% ~ 30%.

As the preferred of above-mentioned technical proposal, the thickness of the first layer accounts for the 20% of the insulation layer thickness, described The thickness of two layerings accounts for the 30% of the insulation layer thickness, and the thickness of the first layer accounts for the 50% of the insulation layer thickness.

When preparing the refractory brick, porosity is controlled by adding the quantity of pore creating material in the feed, then will be containing not Adobe with Content of Pore-forming Agents is superimposed and is sintered after mould and pressing, you can obtain refractory brick described herein.

Now provide a refractory brick formula for reference：

As mass fraction, the parts by weight of sillimanite 10~20；The parts by weight of mullite 10~20；The parts by weight of alumina corundum 10 ~ 20； The parts by weight of pink fused alumina 5 ~ 15；The parts by weight of sillimanite micro mist 5 ~ 10；The parts by weight of copper and iron Spinel micropowder 3 ~ 5；Aluminium riched spinel powder 3 ~ 8 Parts by weight；The parts by weight of nickel oxide powder 3~5, the parts by weight of pure calcium aluminate cement 2~5, the weight powder of alumina gel powder 2 ~ 4；Additive 0.35 Parts by weight, pore creating material is added on demand.

The present invention compared with prior art, with advantages below and beneficial effect：

（1）The refractory brick more lightweight, weight alleviates more than 20% compared to existing technologies；

（2）The excellent thermal insulation performance of the refractory brick；

（3）The refractory brick ensure that the performance indications such as compressive resistance, refractoriness under load and thermal shock resistance are maintained at simultaneously Outstanding level.

Brief description of the drawings

Fig. 1 is the electrical kiln firebrick structure schematic diagram of light thermal-insulation.

In figure：Supporting layer a1, heat-insulation layer a2, first layer a21, the second layering a22, the 3rd layering a23.

Embodiment

The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings：

Embodiment 1：With reference to Fig. 1, the electrical kiln refractory brick of a kind of light thermal-insulation, by supporting layer a1 and combined with it porous Heat-insulation layer a2 is constituted；

The supporting layer a1 is compacted zone, and its thickness accounts for the 18% of the refractory brick thickness；

The heat-insulation layer a2 includes the first layer a21 adjacent with the supporting layer a1, positioned at the second middle layering a22 and Porosity away from the 3rd farthest supporting layer a1 layering a23, the first layer a21 is 12%, the second layering a22 Porosity be 20%, it is described 3rd layering a23 porosity be 30%；

The thickness of the first layer a21 accounts for the 20% of the heat-insulation layer a2 thickness, and the thickness of the second layering a22 accounts for described The 30% of heat-insulation layer a2 thickness, the thickness of the first layer a23 accounts for the 50% of the heat-insulation layer a3 thickness

When piling up electrical kiln, the supporting layer a1 constitutes the outer layer of refractory brick packing structure, and the heat-insulation layer a2 constitutes refractory brick heap Build the nexine of structure.

Embodiment 2：With reference to Fig. 1, it is with the difference of embodiment 1：The thickness of the supporting layer a1 accounts for the fire resisting The 22% of brick thickness, the porosity of the first layer a21 is 8%%, and the porosity of the second layering a22 is 15%%, described the Three layering a23 porosity is 22%.

Embodiment 3：With reference to Fig. 1, it is with the difference of embodiment 1：The heat-insulation layer a2 includes 4 layerings, presses Range is from supporting layer a1 by being respectively 5%, 15%, 30% and 45% closely to remote porosity, and its thickness is impartial.

Embodiment 4：With reference to Fig. 1, it is with the difference of embodiment 1：The porosity of the supporting layer a1 is 5%, described Heat-insulation layer a2 includes 2 layerings, according to apart from supporting layer a1, by being respectively 10% and 25% closely to remote porosity, its thickness is equal Deng.

Table one is refractory brick performance parameter described in 1 ~ embodiment of embodiment 4.

Refractory brick performance parameter prepared by the 1 ~ embodiment of embodiment 4 of table one

The weight of refractory brick of the present invention will mitigate 15% ~ 30% compared to existing solid refractory brick, alleviate cost of transportation； Heat-insulating property is more preferably, it is possible to decrease electrical kiln heats energy consumption more than 12%；Meanwhile, it is used as refractory brick, its compressive resistance, loading softening temperature The performance indications such as degree and thermal shock resistance also maintain outstanding level.

Claims

1. a kind of electrical kiln refractory brick of light thermal-insulation, it is characterised in that：By supporting layer（a1）With it is combined with it porous Heat-insulation layer (a2) is constituted；

When piling up electrical kiln, the supporting layer（a1）Constitute the outer layer of refractory brick packing structure, the heat-insulation layer（a2）Constitute fire resisting The nexine of brick packing structure；

The supporting layer（a1）Porosity be 0% ~ 5%, the heat-insulation layer（a2）Porosity be 5% ~ 45%.

2. a kind of electrical kiln refractory brick of light thermal-insulation according to claim 1, it is characterised in that：The supporting layer（a1） For the sintered rear compacted zone formed.

3. a kind of electrical kiln refractory brick of light thermal-insulation according to claim 1, it is characterised in that：The supporting layer（a1） Thickness account for the 18% ~ 22% of the refractory brick thickness.

4. a kind of electrical kiln refractory brick of light thermal-insulation according to claim 1, it is characterised in that：The heat-insulation layer（a2） Include several layerings, the wherein minimum layering of porosity and the supporting layer according to the order of porosity from small to large（a1） It is adjacent.

5. a kind of electrical kiln refractory brick of light thermal-insulation according to claim 4, it is characterised in that：The quantity of the layering For 2 ~ 4 layers.

6. a kind of electrical kiln refractory brick of light thermal-insulation according to claim 5, it is characterised in that：The quantity of the layering For 3 layers.

7. a kind of electrical kiln refractory brick of light thermal-insulation according to claim 6, it is characterised in that：It is described layering according to away from From the supporting layer（a1）Order from the near to the remote be respectively and the supporting layer（a1）Adjacent first layer（a21）, be located at The second middle layering（a22）And away from the supporting layer（a1）The 3rd farthest layering（a23）；

The first layer（a21）Porosity be 8% ~ 12%, it is described second layering（a22）Porosity be 15% ~ 20%, it is described 3rd layering（a23）Porosity be 22% ~ 30%.

8. a kind of electrical kiln refractory brick of light thermal-insulation according to claim 7, it is characterised in that：The first layer （a21）Thickness account for the heat-insulation layer（a2）The 20% of thickness, second layering（a22）Thickness account for the heat-insulation layer（a2） The 30% of thickness, the first layer（a23）Thickness account for the heat-insulation layer（a3）The 50% of thickness.