Aluminum oxide gas suspending calcining furnace breakage inside lining quick-speed repair method

Abstract

The invention provides a method for rapidly repairing the breakage of inner lining of an alumina gas suspension calcining kiln, which is characterized in that the selected repair materials are AL-Cr series high-intensity composite corundum ramming materials and composite corundum coating materials, and coating, ramming, caulking, compaction, smooth treatment of surface and other different overhaul and construction methods are adopted according to breakage type of calcining kiln inner lining, surface wear of inner lining, and large drop block and expansion joint. The invention not only can greatly reduce the overhaul workload of the kiln lining, but also can implement the coating and repair for the breakage position of the wear surface of the calcining kiln inner lining; the coating materials form an enamel layer on the surface of the inner lining materials, which can effectively prevent the kiln lining from being continuously worn and prevent the inner lining particles from falling off and thereby prolong the life of the calcining kiln inner lining. After the broken inner lining is repaired, the heat dissipation can be effectively prevented; the surface temperature of the coating and repair position of the calcining kiln can be reduced by 18 to 40 degrees Celsius.

Description

technical field [0001] The invention relates to a gas suspension roasting kiln produced by alumina, in particular to a quick repair method for the damaged inner lining of the roasting furnace. Background technique [0002] Alumina Gaseous Suspension Calciner (GSC) is a large-scale roasting device based on dilute phase and combined dilute and dense phases. It was introduced by FLS Company of Denmark. Compared with other types of furnaces, it has the characteristics of large production capacity and low energy consumption. , has been widely used in the domestic alumina industry. [0003] The gas suspension roaster is a combined high-temperature, multi-stage gas-solid reverse operation complex metallurgical equipment, which is composed of three major systems: material drying, dehydration preheating, main reaction furnace and product cooling. The working state of the lining of the roasting furnace is to complete the dehydration of 10% of aluminum hydroxide and the lattice transf...

AI Technical Summary

Problems solved by technology

[0006] (1) Due to the insufficient structural design of the refractory lining introduced in the early stage, the GS furnace's sloping roof, the whole piece or a part of the furnace roof fell off and peeled off

[0007] (2) Due to Al 2 o 3 , Al(OH) 3 As a working medium, the strong erosion and abrasion will cause large-area erosion damage on the upper and lower parts of the cones of CO1, CO2, CO3, PO3, PO4, etc., resulting in severe abrasion of refractory materials in these parts

In order to control the maintenance time of the furnace, for the parts with small damage, keep running, otherwise the maintenance time of the furnace will be too long, which will affect the operation rate of the roaster

In this way, those damaged small furnace linings are further expanded during operation, causing excessive local temperature and large heat dissipation.