Heat radiation coating for carbon roasting furnace flue lining and preparation method of heat radiation coating

Abstract

The invention discloses a heat radiation coating for a carbon roasting furnace flue lining and a preparation method of the heat radiation coating. The heat radiation coating for the carbon roasting furnace flue lining is formed by mixing and aging a mixture and an additive. Based on the total mass of the mixture and the additive, the mixture is prepared from 50-80 wt% of silicon carbide, 0-40 wt% of soft clay, 0-5 wt% of silica powder and 0-5 wt% of metallic silicone powder; the additive is prepared from 8-32 wt% of aluminum dihydrogen phosphate, 1-10 wt% of sintering agent and 005-5.0 wt% of binding agent. The preparation method of the heat radiation coating includes the steps that 1, silicon carbide, soft clay, silica powder and metallic silicone powder are selected to be prepared into the mixture, and aluminum dihydrogen phosphate, the sintering agent and the binding agent are selected to be prepared into the additive; 2, the mixture and the additive are mixed and stirred to be uniform; 3, aging is carried out for 6-24 hours, and the heat radiation coating for the carbon roasting furnace flue lining is obtained.

Description

technical field [0001] The invention relates to the technical field of carbon roasting furnaces, in particular to a thermal radiation coating for the inner lining of a carbon roasting furnace flue and a preparation method thereof. Background technique [0002] With the rapid promotion and application of the carbon industry, the demand for refractory materials is getting higher and higher. Carbon roasting furnace is a key process in the production of prebaked electrolytic aluminum anodes. The roasting furnace consumes a lot of energy and emits a large amount of asphalt fume, dust and other pollutants during the production process. Therefore, the service life of the roasting furnace flue is getting more and more attention. [0003] Carbon roaster flue usually adopts lightweight castable with high refractoriness, good strength and thermal shock resistance as the flue lining material. However, flue lining materials are not only subjected to harsh environments such as the penetr...

AI Technical Summary

Problems solved by technology

However, flue lining materials are not only subjected to harsh environments such as the penetration and erosion of asphalt gas and harmful sulfide products, but also face high radiation temperatures and frequent alternating heat and cold, resulting in carbon roaster flue lining materials often Unsatisfactory life due to peeling

In order to further improve the anti-corrosion performance of the carbon roaster flue, relevant enterprises try to choose semi-lightweight materials as the lining material of the flue. The corrosion and erosion of the flue lining material often cause the outer steel drum of the flue to burn red due to peeling off during the production process, and the insulation effect is not ideal, which affects the normal operation of the roaster. In addition, some enterprises try to use a liquid water glass The combined smearing material is applied on the working layer of the light castable material, but because the liquid water glass is an alkaline compound, it is more susceptible to the erosion of acidic compounds such as asphalt gas and sulfides generated during the roasting process to accelerate peeling and shorten the service life. Due to the short storage period, it is easy to precipitate and delaminate, causing troubles in construction