Method for producing one-dipping two-baking anode carbon block

Abstract

The invention discloses a method for producing one impregnating two calcining anode carbon blocks, which is on the basis of producing common anode carbon blocks and comprises following steps: selectively using calcined coke, adding a little antioxidant additive, preheating a common anode under the temperature of 280-330DEG C for 18-24 hours, then, hoisting in a high pressure impregnation tank, filling impregnating pitch whose temperature is 160-180DEG C under the vacuum pressure of 0.09-0.094MPa, pressurizing 1.55-1.6MPa, maintaining the pressure for 3-5 hours, hoisting out and cooling to normal temperature, then, calcining for 200-220 hours under the temperature condition that the maximum temperature is 800-900DEG C according to a heating curve, cooling, and then cleaning up to obtain a new one impregnating two calcining anode carbon block. Since the pitch is filled in an air vent of the anode, the mechanicalness and the physical and chemical properties of the anode carbon blocks are newly changed, the bulk density and the compressive strength are increased, the porosity is lowered, the resistivity is lowered, the activity of the binder coke and the activity of aggregate tend to be consistent, the speed of selective oxidation is lowered, the voltage drop of the anode carbon blocks is lowered, and the using period of the anode is prolonged.

Description

Technical field: [0001] The invention relates to a production method of an anode carbon block, in particular to a production method of an anode carbon block soaked twice and its behavior in an aluminum electrolytic cell. Background technique: [0002] At present, the resistivity of prebaked anode carbon blocks for aluminum electrolysis is generally between 55 and 65 μΩ.m, and the service life is about 28 days. During the use process, prebaked anode carbon blocks have serious oxidation, slag drop, and cracks. There is a lot of carbon slag in the electrolytic cell, which reduces the service life of the prebaked anode carbon block, and increases the labor intensity of the workers; the resistivity of the electrolyte increases, the electrolyte heats up, the fluoride salt volatilizes and the electrolyte taken away by the carbon slag, resulting in the consumption of fluoride salt Substantial increase, workshop operating conditions deteriorated, serious environmental pollution. In...

AI Technical Summary

Problems solved by technology

There is a lot of carbon slag in the electrolytic cell, which reduces the service life of the prebaked anode carbon block, and the labor intensity of the workers increases; the resistivity of the electrolyte increases, the electrolyte heats up, the fluoride salt volatilizes and the electrolyte taken away by the carbon slag, resulting in the consumption of fluoride salt Substantial increase, deteriorating workshop operating conditions, serious environmental pollution