A kind of cold ramming paste for the integral furnace construction technology of electrolytic aluminum cathode tank

Abstract

The invention relates to a cold ramming paste material used for an electrolytic aluminum cathode cell overall furnace building technology. The cold ramming paste material is composed of, by weight, 0-50% of electrically calcined anthracite or metallurgical coke, 0-25% of artificial graphite powder, 16-23% of modified bituminous cement, 11.4-68.5% of andalusite and 3.6-21.5% of aluminum oxide. Thetechnology has the advantages that the problems that cold ramming paste is insufficient in expansion rate during sintering, low in electrical resistivity after sintering and low in erosion resistancein the overall furnace building technique are solved; the andalusite and the aluminum oxide are added into the cold ramming paste material, a side wall furnace lining is built overall according to different proportions, gradient change with the roasting body resistance being gradually increased from bottom to top from the electrolytic cell bottom to the molten salt surface after roasting is formed, the side wall and transverse current is reduced, the electrolytic current efficiency is improved, and energy consumption is effectively lowered; the size is increased in the roasting process, contraction of other materials is compensated, cracks are reduced, and the compactness is improved; and a network structure with graphite and mullite being staggered is generated in a roast body, the electrolyte erosion resistance of the furnace lining is improved, and the risks of furnace leakage and furnace penetration are reduced.

Description

technical field [0001] The invention belongs to the field of refractory materials, and in particular relates to a refractory material suitable for constructing the side wall of an electrolytic aluminum cathode tank by adopting the cold ramming paste integral furnace construction technology. Including the material formula and preparation method used for adding andalusite and alumina to the carbon metallurgical furnace lining. Background technique [0002] At present, aluminum electrolytic cells usually use high-temperature calcined carbon bricks to build furnaces, and carbon paste is used to tamp to fill the gaps between carbon blocks and between carbon blocks and steel rods, and the cathode of aluminum electrolytic cells is integrated by roasting. Most of these carbon pastes are composed of aggregates, binders, and additives. The aggregates are mostly composed of one or more of anthracite, metallurgical coke, petroleum coke, and graphite; commonly used binders are pitch, co...

AI Technical Summary

Problems solved by technology

However, although silicon carbide materials with better high temperature resistance are added to the cold stamping paste on the side of the cathode electrolytic cell used in this technology, its main composition is still based on carbon materials, which still have high conductivity and heat generation. , leading to induced eddy currents on the side wall of the electrolysis process, high reactive power consumption, etc.

In addition, the added silicon carbide itself does not undergo phase transformation and volume change during sintering, and the density and strength of the sintered body are low, which will also reduce the service life of the lining refractory