阅读说明：本技术 一种危险废物处置回转窑用高致密铬锆刚玉砖 (High-density chromium-zirconium-corundum brick for hazardous waste disposal rotary kiln ) 是由 夏文斌 高长贺 占华生 马淑龙 卫迎锋 蔡斌利 于 2020-12-07 设计创作，主要内容包括：一种危险废物处置回转窑用高致密铬锆刚玉砖,属于耐火材料领域。铬锆刚玉砖按重量百分比各组份为：粒径≤3mm的氧化铬：1～10％；粒径≤3mm的氧化锆：1～10％；粒径≤0.004mm氧化铝微粉：5～15％；结合剂：1～5％；余量为粒径≤8mm的刚玉；将上述原料要求配比混合,于混炼机中制成泥料,在≥400吨的压力下成型,成型后砖坯于1500～1800℃的隧道窑或者梭式窑内烧成。优点在于,适用于各种规格危险废弃物处置用回转窑,产品使用寿命可达到6个月以上,对提高危险废弃物处置用回转窑运转率起到了非常积极的作用。(A high-density chromium-zirconium-corundum brick for a hazardous waste disposal rotary kiln belongs to the field of refractory materials. The chromium-zirconium corundum brick comprises the following components in percentage by weight: chromium oxide with a particle size of less than or equal to 3 mm: 1-10%; zirconia with a particle size of less than or equal to 3 mm: 1-10%; alumina micro powder with the particle size less than or equal to 0.004 mm: 5-15%; binding agent: 1-5%; the balance is corundum with the grain diameter less than or equal to 8 mm; the raw materials are mixed according to the required proportion, pug is prepared in a mixing roll, the pug is formed under the pressure of more than or equal to 400 tons, and the formed green brick is fired in a tunnel kiln or a shuttle kiln at the temperature of 1500-1800 ℃. The rotary kiln for disposing the hazardous waste has the advantages that the rotary kiln is suitable for the rotary kilns for disposing the hazardous waste of various specifications, the service life of a product can reach more than 6 months, and the rotary kiln has a very positive effect on improving the running rate of the rotary kiln for disposing the hazardous waste.)

1. A high-density chromium-zirconium-corundum brick for a hazardous waste disposal rotary kiln is characterized by comprising the following components in percentage by weight: chromium oxide with a particle size of less than or equal to 3 mm: wherein Cr is₂O₃More than or equal to 98 percent, and the mass percent is 1-10 percent; zirconia with a particle size of less than or equal to 3 mm: wherein ZrO₂More than or equal to 98 percent, and the mass percent is 1-10 percent; alumina micro powder with the particle size less than or equal to 0.004 mm: wherein Al is₂O₃More than or equal to 99 percent, and the mass percent is 5-15 percent; binding agent: the mass percentage is 1-5%; the balance is corundum with the grain diameter less than or equal to 8 mm: wherein Al is₂O₃≥94％。

2. The chromium-zirconium-corundum brick as claimed in claim 1, wherein the binder is one or more of water glass, aluminum dihydrogen phosphate and lignin.

3. The chromium-zirconium-corundum brick as claimed in claim 1, wherein the preparation method of the chromium-zirconium-corundum brick comprises the following specific steps and parameters:

1) preparing materials: chromium oxide with a particle size of less than or equal to 3 mm: 1-10%; zirconia with a particle size of less than or equal to 3 mm: 1-10%; alumina micro powder with the particle size less than or equal to 0.004 mm: 5-15%; binding agent: 1-5%; the balance is corundum with the grain diameter less than or equal to 8 mm: wherein Al is₂O₃≥94％；

2) Mixing: weighing various raw materials according to the proportion, and uniformly mixing in a mixing roll to obtain pug;

3) molding: pressing and forming the mixed wet material after 1-24 hours, wherein the tonnage of a forming press is more than or equal to 400 tons;

4) and (3) drying: drying in a drying kiln for more than 24 hours, wherein the temperature of a drying entrance is 30-70 ℃, and the highest drying temperature is controlled at 110-150 ℃;

5) and (3) firing: firing in a 1500-1800 ℃ high-temperature tunnel kiln or a shuttle kiln.

Technical Field

The invention belongs to the field of refractory materials, and particularly relates to a high-density chromium-zirconium-corundum brick for a rotary kiln for hazardous waste disposal.

Background

In recent years, with the massive construction of hazardous waste treatment projects in China, the lining of a rotary kiln of main incineration equipment mainly uses refractory bricks, the types of treated materials are complex, the requirements on refractory materials are strict, and the service life of the refractory bricks becomes a key for increasing benefits in hazardous waste treatment operation management. However, the corrosion resistance, penetration resistance, thermal shock resistance and high-temperature wear resistance of the currently used refractory bricks are influenced by the raw material selection and production process, and the comprehensive performance is low, so that the long-life and high-load operation of the rotary kiln cannot be guaranteed.

Disclosure of Invention

The invention aims to provide a high-density chromium-zirconium-corundum brick for a rotary kiln for hazardous waste disposal, which solves the problems of corrosion resistance, permeation resistance, thermal shock resistance and low comprehensive performance of high-temperature wear resistance of a refractory brick. In particular to a high-density chromium-zirconium corundum brick with excellent comprehensive performances of erosion resistance, permeation resistance, thermal shock resistance, high temperature wear resistance and the like.

A high-density chromium-zirconium-corundum brick for a rotary kiln for hazardous waste disposal comprises the following components in percentage by weight: chromium oxide with a particle size of less than or equal to 3 mm: wherein Cr is₂O₃More than or equal to 98 percent, and the mass percent is 1-10 percent; zirconia with a particle size of less than or equal to 3 mm: wherein ZrO₂More than or equal to 98 percent, and the mass percent is 1-10 percent; alumina micro powder with the particle size less than or equal to 0.004 mm: wherein Al is₂O₃More than or equal to 99 percent, and the mass percent is 5-15 percent; binding agent: the mass percentage is 1-5%; the balance is corundum with the grain diameter less than or equal to 8 mm: wherein Al is₂O₃≥94％。

The binding agent is one or more of water glass, aluminum dihydrogen phosphate, lignin and the like.

The raw materials are mixed according to the required proportion, pug is prepared in a mixing roll, the pug is formed under the pressure of more than or equal to 400 tons, and the formed green brick is fired in a tunnel kiln or a shuttle kiln at the temperature of 1500-1800 ℃.

The preparation steps are as follows:

1) preparing materials: chromium oxide with a particle size of less than or equal to 3 mm: 1-10%;zirconia with a particle size of less than or equal to 3 mm: 1-10%; alumina micro powder with the particle size less than or equal to 0.004 mm: 5-15%; binding agent: 1-5%; the balance is corundum with the grain diameter less than or equal to 8 mm: wherein Al is₂O₃≥94％。

2) Mixing: weighing various raw materials according to the proportion, and uniformly mixing in a mixing roll to obtain pug;

3) molding: pressing and forming the mixed wet material after 1-24 hours, wherein the tonnage of a forming press is more than or equal to 400 tons;

4) and (3) drying: drying in a drying kiln for more than 24 hours, wherein the temperature of a drying entrance is 30-70 ℃, and the highest drying temperature is controlled at 110-150 ℃.

5) And (3) firing: firing in a 1500-1800 ℃ high-temperature tunnel kiln or a shuttle kiln.

The high-density chromium-zirconium-corundum bricks are used in rotary kilns for treating dangerous wastes of various specifications.

The invention has the advantages that the rotary kiln is suitable for the rotary kilns for disposing the hazardous wastes of various specifications, the products have excellent erosion resistance, permeation resistance and thermal shock stability, good high-temperature wear resistance, the service life can reach more than 6 months, and the rotary kiln plays a very positive role in improving the running rate of the rotary kilns for disposing the hazardous wastes. The fired high-density chromium zirconium corundum brick has simple process and excellent performance.

Detailed Description

Example 1

The high-density chromium-zirconium-corundum brick for the rotary kiln for treating the hazardous waste comprises the following components in parts by weight:

the raw materials are mixed according to the required proportion, pug is prepared in a mixing roll, the pug is formed under the pressure of more than or equal to 400 tons, and the formed green brick is sintered in a 1500-plus 1800 ℃ tunnel kiln or a shuttle kiln.

Example 2

The high-density chromium corundum brick for the rotary kiln for treating the hazardous waste comprises the following components in parts by weight:

the raw materials are mixed according to the required proportion, pug is prepared in a mixing roll, the pug is formed under the pressure of more than or equal to 400 tons, and the formed green brick is sintered in a 1500-plus 1800 ℃ tunnel kiln or a shuttle kiln.