阅读说明：本技术 一种焦炉炉门用堇青石-莫来石质耐火材料及其生产方法 (Cordierite-mullite refractory material for coke oven door and production method thereof ) 是由 姚君 甘秀石 张大奎 张展 朱庆庙 张馨予 贾楠楠 于 2020-04-30 设计创作，主要内容包括：本发明公开一种焦炉炉门用堇青石-莫来石质耐火材料,组份以质量百分比计：35-45％粒度为3-1mm的焦宝石；20-30％粒度<1mm的焦宝石；10％-25％粒度为0.088-0.045mm的堇青石熟料；15-25％粒度<0.045mm的堇青石细粉。(The invention discloses a cordierite-mullite refractory material for a coke oven door, which comprises the following components in percentage by mass: 35-45% of flint clay with the grain size of 3-1 mm; 20-30% flint clay with particle size less than 1 mm; 10% -25% of cordierite clinker with the granularity of 0.088-0.045 mm; 15-25% fine cordierite powder with a particle size of less than 0.045 mm.)

1. The cordierite-mullite refractory material for the coke oven door is characterized by comprising the following components in percentage by mass: 35-45% of flint clay with the grain size of 3-1 mm; 20-30% flint clay with particle size less than 1 mm; 10% -25% of cordierite clinker with the granularity of 0.088-0.045 mm; 15-25% fine cordierite powder with a particle size of less than 0.045 mm.

2. The method for producing a cordierite-mullite refractory material for a coke oven door according to claim 1, wherein: the cordierite-mullite refractory material for the coke oven door is prepared by using flint clay with the granularity of 3-1mm and less than 1mm as aggregate, cordierite clinker with the granularity of 0.088-0.045mm and cordierite fine powder with the granularity of less than 0.045mm as matrix materials and adding a bonding agent, and performing premixing, mixing, mechanical compression molding, drying and firing, and the specific operation steps are as follows:

1) according to the mass percentage, 35-45% of flint clay with the granularity of 3-1mm and 20-30% of flint clay with the granularity of less than 1mm, 10-25% of cordierite clinker with the granularity of 0.088-0.045mm and 15-25% of cordierite fine powder with the granularity of less than 0.045mm are placed in a mixing roll for premixing to obtain a premixed material;

2) adding a bonding agent accounting for 2-4% of the total mass of the premixed material, adding the premixed material obtained in the step 1), and placing the premixed material in a mixing roll to continue mixing for 10-20 minutes to obtain mixed pug;

3) placing the pug in a mould for mechanical forming;

4) drying the blank formed by machine pressing for more than 12 hours at the temperature of more than 100 ℃ to obtain a dried material;

5) calcining the materials in a 1300-plus-1450 ℃ high-temperature furnace, preserving the heat for 3-6h, naturally cooling along with the furnace, and taking out the materials to obtain the catalyst.

3. The method for producing a cordierite-mullite refractory for a coke oven door according to claim 2, wherein: the binding agent is paper pulp waste liquid.

Technical Field

The invention belongs to the field of chemical engineering, and relates to a cordierite-mullite refractory material for a coke oven door and a production method thereof.

Background

The coke oven is the basic thermal equipment in the coking industry. The service life of the existing coke oven is mostly more than 30 years, compared with the long service life of the coke oven, the service life of the coke oven is not long due to mechanical damage, thermal damage and the like caused by frequent opening of a coke oven production door, high surface temperature, large change of coal charging and coke discharging temperature, poor operation environment and the like, and the normal production of the coke oven is also adversely affected by frequent repair and replacement of the coke oven door. In order to make the coke oven door have a longer service life, the used refractory material must have good thermal shock stability, higher strength and chemical erosion resistance.

Researchers at home and abroad have made a lot of researches on refractory materials for coke oven doors, for example, clay refractory materials, light heat insulating materials, cordierite refractory materials and the like are used. Although the clay brick has low price and high strength, the thermal expansion coefficient and the elastic modulus of the clay brick are large, so the thermal shock resistance stability of the clay brick is poor; the thermal insulation material has the characteristics of low thermal conductivity, small thermal expansion coefficient and elastic modulus, good thermal shock resistance and the like, but has the defects and disadvantages of low strength, large apparent porosity, easy penetration of coke and chemical products in the coking process of the coke into lining bricks to erode the lining bricks and the like, and the pure cordierite brick has small thermal expansion coefficient and good thermal shock resistance, but has poor strength and high-temperature stability, is high in price and is not suitable for being used in the coking industry.

Therefore, a second phase capable of being compounded with cordierite is urgently needed, the cost of using pure cordierite bricks can be reduced, the strength, thermal shock resistance and other properties of the material can be improved, and the service life of the coke oven door can be prolonged.

Disclosure of Invention

In order to overcome the defects, the invention aims to provide a cordierite-mullite refractory material for a coke oven door and a production method thereof.

In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:

the cordierite-mullite refractory material for the coke oven door is characterized by comprising the following components in percentage by mass: 35-45% of flint clay with the granularity of 3-1mm, 20-30% of flint clay with the granularity of less than 1mm, 10-25% of cordierite clinker with the granularity of 0.088-0.045mm and 15-25% of cordierite fine powder with the granularity of less than 0.045 mm.

A production method of cordierite-mullite refractory material for coke oven doors is characterized by comprising the following steps: the cordierite-mullite refractory material for the coke oven door is prepared by using flint clay with the granularity of 3-1mm and less than 1mm as aggregate, cordierite clinker with the granularity of 0.088-0.045mm and cordierite fine powder with the granularity of less than 0.045mm as matrix materials and adding a bonding agent, and performing premixing, mixing, mechanical compression molding, drying and firing, and the specific operation steps are as follows:

1) according to the mass percentage, 35-45% of flint clay with the granularity of 3-1mm and 20-30% of flint clay with the granularity of less than 1mm, 10-25% of cordierite clinker with the granularity of 0.088-0.045mm and 15-25% of cordierite fine powder with the granularity of less than 0.045mm are placed in a mixing roll for premixing to obtain a premixed material;

2) adding a bonding agent accounting for 2-4% of the total mass of the premixed material, adding the premixed material obtained in the step 1), and placing the premixed material in a mixing roll to continue mixing for 10-20 minutes to obtain mixed pug;

3) placing the pug in a mould for mechanical forming;

4) drying the blank formed by machine pressing for more than 12 hours at the temperature of more than 100 ℃ to obtain a dried material;

5) calcining the materials in a 1300-plus-1450 ℃ high-temperature furnace, preserving the heat for 3-6h, naturally cooling along with the furnace, and taking out the materials to obtain the catalyst.

The binding agent is paper pulp waste liquid.

The method can obtain the following beneficial effects: 1) due to the mismatch of thermal expansion coefficients of cordierite and mullite, microcracks are formed on two-phase interfaces, and the thermal shock stability of the material is greatly improved. 2) The cordierite fine powder is added, and the existence of cordierite in the substrate can improve the sintering of the material, so that the connection of the tissue structure is firmer, and the compressive strength is improved. 3) The normal temperature rupture strength is more than 10.6MPa, the compressive strength is more than 114MPa, and the rupture strength retention rate after 10 times of thermal shock is more than 49 percent.

Detailed Description

The following description is given with reference to specific examples: