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Refractory bricks for flue walls of carbon anode baking furnaces and preparation method thereof

A carbon anode and refractory brick technology, which is applied in the field of roasting furnaces, can solve the problems of low porosity of refractory bricks, high softening temperature under load, and low creep rate at high temperature, and achieve high softening temperature under load, stable volume at high temperature, and high temperature creep low rate effect

Active Publication Date: 2012-06-20
河南鑫诚耐火材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the defects in the above-mentioned prior art, the present invention provides a refractory brick for the flue wall of a carbon anode roasting furnace and a preparation method thereof, so as to solve the problem of high temperature creep rate, high porosity, and high temperature of the traditional flue wall refractory brick. Due to the defect of high thermal expansion rate, the refractory brick used for the flue wall of the carbon anode roasting furnace of the present invention has low apparent porosity, low high temperature creep rate, high load softening temperature, stable volume at high temperature, and high mechanical strength

Method used

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  • Refractory bricks for flue walls of carbon anode baking furnaces and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. After the calcined kaolin is crushed, it is screened into two grades with a particle size of 3-1mm and 1-0mm;

[0019] 2. After mixing 20% ​​sillimanite, 15% alumina powder and 10% bonded clay, grind it into a co-milled powder with a fineness of ≦0.088㎜;

[0020] 3. Mix the co-milled powder with 38% of calcined kaolin of 3-1mm grade and 17% of calcined kaolin of 1-0mm grade according to the above ratio, and add pulp waste liquid and mix together for 10-15 minutes;

[0021] 4. The mixed mud is pressed and formed into adobe, dried at 80-160°C, put into a tunnel kiln, and calcined at 1480-1500°C to make a refractory material;

[0022] 5. Press molding, use 315T pneumatic press to press the mud to a density of ﹥2.55g / ㎝ 3 of adobe.

Embodiment 2

[0024] 1. After the calcined kaolin is crushed, it is screened into two grades with a particle size of 3-1mm and 1-0mm;

[0025] 2. After mixing 25% sillimanite, 8% alumina powder and 12% bonded clay, grind it into a co-milled powder with a fineness of ≦0.088㎜;

[0026] 3. Mix the co-milled powder with 30% of calcined kaolin of 3-1mm grade and 23% of calcined kaolin of 1-0mm grade according to the above ratio, and add pulp waste liquid and mix together for 10-15 minutes;

[0027] 4. The mixed mud is pressed and formed into adobe, dried at 80-160°C, put into a tunnel kiln, and calcined at 1480-1500°C to make a refractory material;

[0028] 5. Press molding, use 315T pneumatic press to press the mud to a density of ﹥2.55g / ㎝ 3 of adobe.

Embodiment 3

[0030] 1. After the calcined kaolin is crushed, it is screened into two grades with a particle size of 3-1mm and 1-0mm;

[0031] 2. After mixing 23% sillimanite, 13% alumina powder and 8% bonded clay, grind it into a co-milled powder with a fineness of ≦0.088㎜;

[0032] 3. Mix the co-milled powder with 35% of calcined kaolin of 3-1mm grade and 21% of calcined kaolin of 1-0mm grade according to the above ratio, and add pulp waste liquid and mix together for 10-15 minutes;

[0033] 4. The mixed mud is pressed and formed into adobe, dried at 80-160°C, put into a tunnel kiln, and calcined at 1480-1500°C to make a refractory material;

[0034] 5. Press molding, use 315T pneumatic press to press the mud to a density of ﹥2.55g / ㎝ 3 of adobe.

[0035] The physical and chemical properties of the special brick for the flue wall of the carbon roasting furnace of the present invention are compared with refractory bricks and high-alumina bricks, as shown in Table 1

[0036] Table I

[0...

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Abstract

The invention provides refractory bricks for flue walls of carbon anode baking furnaces and a preparation method thereof. The refractory bricks are prepared from the following raw materials: 30 to 38 percent of calcined kaolin with the grain size of 3-1mm, 17 to 23 percent of calcined kaolin with the grain size of 1-0mm, 20 to 25 percent of sillimanite with the grain size of 1-0mm, 8 to 15 percent of alumina powder, and 8 to 12 percent of binding clay. The refractory bricks are prepared by mixing, molding and calcining, and solve the problems of high high-temperature creep rate, high porosity and high thermal expansion ratio of the traditional refractory bricks for the flue walls. The refractory bricks for the flue walls of the carbon anode baking furnaces have the advantages of low porosity, low high-temperature creep rate, high refractoriness under load, high-temperature volume stability, good thermal stability, longer service life, improvement of the furnace life of the carbon anode baking furnaces and reduction of maintenance cost.

Description

technical field [0001] The invention relates to a refractory brick used for a flue wall of a carbon anode roasting furnace for electrolytic aluminum and a preparation method thereof, belonging to the technical field of roasting furnaces. Background technique [0002] The carbon anode roasting furnace is mainly used to roast the carbon block to become the anode carbon block used in the electrolytic cell. Indirect heating is carried out to improve the mechanical strength, electrical conductivity and high temperature resistance of carbon products. The refractory bricks used in the furnace flue wall have many varieties, complex shapes, and high technical requirements. A large carbon roasting furnace requires more than 8,000 tons of refractory materials. The weight of bricks and baked products, the high temperature effect of the upper electrode box heating wall and other parts, and the influence of temperature changes during the firing cycle. Therefore, the refractory bricks use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 靳艳军王忠心彭亚琴
Owner 河南鑫诚耐火材料股份有限公司
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