Zirconium-chromium corundum brick for hazardous waste plasma melting furnace refractory material working layer and method

Abstract

The invention relates to a zirconium-chromium corundum brick for a working layer of a hazardous waste plasma melting furnace refractory material, which comprises the following components in parts by mass: 15-20 parts of chromium oxide powder, 10-13 parts of alumina powder, 10-13 parts of mullite powder, 20-30 parts of fused corundum, 15-40 parts of corundum powder, 10-20 parts of zirconium oxide powder, 10-15 parts of kaolinite and 5-10 parts of nano ceramic powder. The method has the beneficial effects that the existing amorphous refractory material is adjusted into the chromium corundum castable, and the chromium corundum castable is adopted to cast the working layer in the hazardous waste plasma melting furnace; particles and fine powder in the chrome corundum brick are connected into a whole and are sintered at high temperature, so that the material strength is greatly improved; the refractoriness and refractoriness under load of the chrome corundum brick are superior to those of the original material; the service life of the plasma furnace refractory material can be effectively prolonged to more than one year; the zirconium-chromium corundum brick is high in strength, outstanding in wear resistance, strong in slag erosion resistance and penetration resistance and excellent in gas erosion resistance.

Description

Technical Field

[0001] The invention belongs to the technical field of refractory materials for hazardous waste plasma melting furnaces, and in particular relates to a zirconium-chromium-corundum brick for a refractory working layer of a hazardous waste plasma melting furnace and a method. Background Art

[0002] The core temperature of the hazardous waste plasma melting furnace reaches 6000℃, and the average temperature in the furnace is 1000-1600℃. Under high temperature, the electronic / chemical reaction capacity is high, the lower part belongs to the incineration vitrified slag liquid pool material erosion area, the middle part belongs to the incineration high temperature area, and the top part belongs to the fly ash corrosion and wear serious area.

[0003] However, there are few refractory products for various areas in the hazardous waste plasma melting furnace, and the existing technology mostly uses chrome corundum castables to cast the refractory working layer inside the plasma melting furnace; using chrome corundum castables for casting will have the following defects:

[0004] The service life is short, and the internal refractory materials need to be partially repaired every 3 to 6 months; the chrome corundum castable is in the molten pool, and the slag penetrates the refractory seriously, destroying the functional stability of the castable in a short time; when using chrome corundum castable for casting construction, it is necessary to open the mold, erect the mold, mix the materials, cast the whole, and dismantle the mold. Natural curing takes 7 days and furnace baking takes 10 days. The construction process is complicated and the construction period is long; because there are many holes in the plasma melting furnace and too many expansion joints of the castable, the strength of the local refractory materials will decrease, so there are great difficulties in setting the expansion joints of the castable.

[0005] However, if no castable expansion joint is provided in the plasma melting furnace, the expansion cracks therein will be irregularly magnified after the plasma melting furnace is used, thus affecting the life of the equipment. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a zirconium-chromium-corundum brick for a refractory working layer of a hazardous waste plasma melting furnace and a manufacturing method thereof.

[0007] A zirconium-chromium-corundum brick for a refractory working layer of a hazardous waste plasma melting furnace comprises, by mass, 15 to 20 parts of chromium oxide powder, 10 to 13 parts of aluminum oxide powder, 10 to 13 parts of mullite powder, 20 to 30 parts of fused corundum, 15 to 40 parts of corundum powder, 10 to 20 parts of zirconium oxide powder, 10 to 15 parts of kaolinite and 5 to 10 parts of nano-ceramic powder.

[0008] Preferably, the mixture comprises, by weight, 20 parts of chromium oxide powder, 10 parts of aluminum oxide powder, 10 parts of mullite powder, 20 parts of fused corundum, 15 parts of corundum powder, 10 parts of zirconium oxide powder, 10 parts of kaolinite and 5 parts of nano-ceramic powder.

[0009] The method for manufacturing the zirconium-chromium-corundum bricks for the refractory working layer of the hazardous waste plasma melting furnace comprises the following steps:

[0010] Step 1, weigh 15-20 parts of chromium oxide powder, 10-13 parts of aluminum oxide powder, 10-13 parts of mullite powder, 20-30 parts of fused corundum, 15-40 parts of corundum powder, 10-20 parts of zirconium oxide powder, 10-15 parts of kaolinite and 5-10 parts of nano-ceramic powder; mix the materials;

[0011] Step 2, pressing the mixture of step 1 into a brick shape;

[0012] Step 3: Allow the pressed bricks to dry naturally before firing in the kiln.

[0013] Preferably, in step 2, a 1000T press is used to press the mixture into a brick shape.

[0014] Preferably, in step 3, after the bricks are naturally dried for 30 to 36 hours, they are sent to a kiln and fired at 1700° C. for 6 to 10 hours.

[0015] The beneficial effects of the present invention are:

[0016] The present invention adjusts the existing unshaped refractory material into chrome corundum castable (shaped refractory material), and adopts the chrome corundum castable to cast the working layer in the hazardous waste plasma melting furnace; the particles and fine powder in the chrome corundum brick are connected into a whole, and after high-temperature sintering, the material strength is greatly improved; the refractoriness and load softening temperature of the chrome corundum brick manufactured by the present invention are better than the original material.

[0017] After adding zirconium oxide to the chrome corundum castable in the present invention, the material stability of the chrome corundum brick is improved; the chromium oxide added to the chrome corundum castable in the present invention can react with slag to generate production liquid, and the phase viscosity of the production liquid is greater than that of other low-melting materials. The production liquid can prevent the glass slag from penetrating into the brick along the capillary pores, avoiding the formation of a metamorphic layer and causing structural shedding; the present invention can effectively increase the service life of the plasma furnace refractory material and extend it to more than 1 year.

[0018] The manufacturing method of the zirconium-chrome corundum brick of the present invention is convenient for construction; after the zirconium-chrome corundum brick is used to construct the hazardous waste plasma melting furnace, the furnace baking time is reduced, the rework rate is reduced, and the economic benefit of the equipment is improved. The zirconium-chrome corundum brick is fully suitable for the working conditions of the high-temperature plasma melting furnace of the hazardous waste furnace and has good benefits; the zirconium-chrome corundum brick has high strength, outstanding wear resistance, strong resistance to slag erosion and penetration, and excellent resistance to gas scouring. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0020] Example 1

[0021] A zirconium-chromium-corundum brick for a refractory working layer of a hazardous waste plasma melting furnace comprises, by mass, 20 parts of chromium oxide powder, 10 parts of aluminum oxide powder, 10 parts of mullite powder, 20 parts of fused corundum, 15 parts of corundum powder, 10 parts of zirconium oxide powder, 10 parts of kaolinite and 5 parts of nano-ceramic powder.

[0022] Example 2

[0023] On the basis of Example 1, a method for manufacturing zirconium-chromium-corundum bricks for a refractory working layer of a hazardous waste plasma melting furnace comprises the following steps:

[0024] Step 1, weigh 20 parts of chromium oxide powder, 10 parts of aluminum oxide powder, 10 parts of mullite powder, 20 parts of fused corundum, 15 parts of corundum powder, 10 parts of zirconium oxide powder, 10 parts of kaolinite and 5 parts of nano-ceramic powder; mix the materials;

[0025] Step 2: Using a 1000T press, the mixture of step 1 is pressed into a brick shape;

[0026] Step 3: Let the pressed bricks dry naturally for 30 hours, and then send them into a kiln at 1700℃ for 8 hours.

Claims

1. A zirconium-chromium corundum brick for the refractory working layer of a hazardous waste plasma melting furnace, characterized in that: Calculated by mass, it includes: 15-20 parts of chromium oxide powder, 10-13 parts of aluminum oxide powder, 10-13 parts of mullite powder, 20-30 parts of fused corundum, 15-40 parts of corundum powder, 10-20 parts of zirconium oxide powder, 10-15 parts of kaolinite and 5-10 parts of nano ceramic powder.

2. According to claim 1, the zirconium-chromium-corundum brick for the refractory working layer of the hazardous waste plasma melting furnace is characterized by: Calculated by mass, it includes 20 parts of chromium oxide powder, 10 parts of aluminum oxide powder, 10 parts of mullite powder, 20 parts of fused corundum, 15 parts of corundum powder, 10 parts of zirconium oxide powder, 10 parts of kaolinite and 5 parts of nano-ceramic powder.

3. A method for manufacturing zirconium-chromium-corundum bricks for refractory working layer of hazardous waste plasma melting furnace according to any one of claims 1 to 2, characterized in that: The following steps are involved: Step 1, weigh 15-20 parts of chromium oxide powder, 10-13 parts of aluminum oxide powder, 10-13 parts of mullite powder, 20-30 parts of fused corundum, 15-40 parts of corundum powder, 10-20 parts of zirconium oxide powder, 10-15 parts of kaolinite and 5-10 parts of nano-ceramic powder; mix the materials; Step 2, pressing the mixture of step 1 into a brick shape; Step 3: Allow the pressed bricks to dry naturally before firing in the kiln.

4. The method for manufacturing zirconium-chromium-corundum bricks for the refractory working layer of hazardous waste plasma melting furnace according to claim 3 is characterized in that: In step 2, a 1000T press is used to press the mixture into a brick shape.

5. The method for manufacturing zirconium-chromium-corundum bricks for the refractory working layer of hazardous waste plasma melting furnace according to claim 3, characterized in that: In step 3, after the bricks are naturally dried for 30 to 36 hours, they are sent to the kiln and fired at 1700° C. for 6 to 10 hours.