A new type of alumina vertical activated roasting device and roasting method

Abstract

The invention relates to the technical field of preparing activated alumina from non-ferrous metals, and specifically to a new type of alumina vertical activation roasting device and method. Alumina pellets move from top to bottom in the vertical roasting furnace. After pre-storage, roasting and cooling processes, they are discharged from the discharge valve at the bottom of the furnace body. The flue gas generated by the combustion of natural gas is roasted into alumina pellets from bottom to top, and then discharged from the top of the furnace body after primary and secondary dust removal. There is a cooling heat exchange tube arranged in the lower part of the furnace body. Cooling gas flows through the tube. The roasted high-temperature alumina pellets are cooled when flowing out of the tube. The cooling gas in the heat exchange tube is heated and sent to the combustion chamber through the air duct as a combustion support for natural gas. Gas, thereby realizing waste heat recovery of alumina pellets. The invention has a high waste heat recovery rate, sufficient heat exchange between combustion flue gas and alumina pellets, and effectively reduces natural gas energy consumption. The method is reasonable and efficient, and the equipment is simple and easy to operate.

Description

technical field [0001] The invention relates to the technical field of preparing activated alumina from nonferrous metals, in particular to a novel vertical activated alumina roasting device and a roasting method. Background technique [0002] Activated alumina, also known as activated alumina. Alumina is often used as the base material for catalysts. The use of alumina in catalysts is usually called "activated alumina". It has a large surface area and is a porous and highly dispersed solid material. Its microporous surface makes It has adsorption properties, surface activity, excellent thermal stability, etc., and meets the characteristics required by catalysis. When it is used in catalytic reactions, its shape will have a great impact on catalytic reactions. The appearance of its industrial applications There are strips, microspheres, honeycombs, and spheres, among which spherical alumina particles are in close contact with each other when used as a catalyst, and they are...

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Problems solved by technology

[0004] 1. Roasting air enters the furnace from the side, heating unevenly, insufficient roasting of alumina pellets, high energy consumption, and the ratio of natural gas flow rate to finished alumina pellets, that is, the gas-solid ratio is 70-80:1Nm3 / t;

[0005] 2. Large cooling energy consumption and low efficiency;

[0006] 3. The waste heat of high-temperature alumina balls is not recycled, which wastes a part of waste heat resources

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