Modified corundum brick for key part of incineration system of hazardous waste furnace and preparation method of modified corundum brick

By using modified corundum bricks in the combustion area of ​​the incinerator, the damage of refractory materials caused by the reaction of hexavalent chromium and sodium salt under hazardous waste incineration conditions was solved, and the high temperature stability, thermal shock resistance and mechanical strength of the modified corundum bricks were achieved, which significantly extended the service life of the equipment and improved the safety and environmental protection of the incineration system.

CN119707458AInactive Publication Date: 2025-03-28WUXI YUANNENG REFRACTORIES CO LTD
10 Cites 2 Cited by

Patent Information

Application Number
CN202411898976.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-23
Publication Date
2025-03-28
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The chromium-zirconium corundum bricks in the combustion zone of the existing incinerator are damaged and structural damage due to the formation of hexavalent chromium and sodium salt erosion reaction under the hazardous waste burning conditions.

Method used

Modified corundum bricks are used, which consist of 6% to 9% ZrO2 and 90% to 95% of the electromelted corundum component. The electromelted corundum component contains 93% to 94% Al2O3, 0.1% to 0.2% SiO2 and 5% to 6.5% Na2O, and are prepared by ball milling and static pressing, and finally sintering treatment is carried out.

Benefits of technology

Modified corundum tiles show excellent thermal insulation performance, excellent wear resistance, high temperature stability, thermal shock resistance and high mechanical strength, which can significantly extend the service life of the equipment, improve the operating efficiency and stability of the incineration system, and reduce the leakage of harmful substances and the occurrence of safety accidents.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention relates to a modified corundum brick for a key part of a hazardous waste furnace incineration system, which comprises the following components in percentage by mass: 6-9% of ZrO and 90-95% of fused corundum, wherein the fused alumina comprises the following components in percentage by weight: 93%-94% of Al2O3, 0.1%-0.2% of SiO2 and 5%-6.5% of Na2O, and the Al2O3 comprises more than 99% of beta-Al2O3. The modified corundum brick has the beneficial effects that the beta-Al2O3 is firstly used as a main material to prepare the fused corundum, then the zirconium oxide is added into the fused corundum to serve as an auxiliary agent, and a mixture of the fused corundum and the zirconium oxide is sintered, so that the obtained modified corundum brick has excellent heat preservation and heat insulation performance, excellent wear resistance, high-temperature stability and thermal shock resistance and relatively high mechanical strength; and thermal shock resistance: due to the phase change toughening effect of zirconium oxide, the modified fused corundum shows better crack propagation resistance during rapid heating and cooling. And mechanical strength: after the zirconium oxide is added, the overall mechanical strength of the material is improved, and particularly the fracture toughness is remarkably improved.
Need to check novelty before this filing date? Find Prior Art