Micro-expansive brick for carbon anode baking furnace and preparation method thereof

Abstract

The invention discloses a micro-expansive brick for a carbon anode baking furnace and a preparation method thereof. The micro-expansive brick is prepared from the following components in percentage by weight: 6-8% of calcined bauxite clinker having the granularity of 3-5mm, 29-32% of calcined bauxite clinker having the granularity of 1-3mm, 15-20% of calcined flint clay clinker having the granularity of 0-1mm, 10-15% of Guangxi clay powder having the fineness less than or equal to 0.074mm, 14-15% of kyanite powder having the fineness less than or equal to 0.088mm, and 12-18% of calcined bauxite clinker powder having the fineness less than or equal to 0.088mm. The preparation method comprises the following steps: 1, crushing and screening the calcined bauxite clinker and the calcined flint clay clinker; 2, grinding the Guangxi clay, the kyanite and the calcined bauxite clinker; 3, mixing and stirring; 4, adding a paper pulp waste liquid and mixing; 5, pressing brick blanks; 6, drying and calcining to obtain the finished products. The prepared micro-expansive brick for the carbon anode baking furnace is low in creep rate, high in refractoriness under load, high in high-temperature bending strength and longer in service life, and therefore, the service life of the carbon anode baking furnace can be increased to the utmost extent and the maintenance cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of carbon anode roasting furnaces, in particular to a micro-expansion brick for carbon anode roasting furnaces and a preparation method thereof. Background technique [0002] The carbon anode roasting furnace is mainly equipment for roasting carbon blocks to make them anode carbon blocks used in electrolytic cells. Heating to improve the mechanical strength, electrical conductivity and high temperature resistance of carbon products. A large-scale carbon anode roasting furnace requires more than 8,000 tons of refractory materials. In the kiln body structure, the bottom, pit surface, and flue wall must bear the weight of the upper brick body and roasted products for a long time at high temperatures. The roasting furnace material box in the field of anode carbon block production for aluminum is composed of a flue wall and a transverse wall. The foot of the flue wall is the main heat conductor during the anode ...

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Problems solved by technology

[0003] At present, the flue walls of the prior art are all built with solid special-shaped bricks. In order to make full use of the volatile matter overflowing from the anode blocks in the material box, major anode roasting furnace manufacturers at home and abroad use The vertical brick joints do not use mud, and 1-4mm thick empty brick joints are left as volatilization channels. Depending on the negative pressure in the fire channel, these volatiles are drawn into the fire channel to participate in combustion, so as to reduce the input of additional fuel. However, this kind of flue wall only makes mud at the lying joints, but not at the vertical joints. Therefore, the overall strength of the entire flue wall is not ideal. Deformation will even cause the deformation of the material box, resulting in the inability to realize the mechanized operation of the furnace, causing the flue wall to be scrapped in advance and increasing the maintenance cost of the furnace

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