Method for roasting and starting aluminum electrolytic cell

Abstract

The invention discloses a method for roasting and starting an aluminum electrolytic cell. The method comprises the following steps: firstly, evenly and compactly filling conductive bulky grain materials among wall bodies which are projected on cathode abnormal carbon blocks of the electrolytic cell; using coke grains for pouring cracks and filling gaps among the bulky grain materials; laying cokegrains on upper surfaces of the abnormal carbon blocks and the filled bulky grain materials; after laying coke grains of a group of anodes, placing a group of anodes thereon; then installing a soft connector, a current-dividing sheet and a current-dividing steel belt; filling the materials which takes electrolyte powder as the main component in a furnace and evenly laying the materials around theelectrolytic cell; detaching the current-dividing plate and the current-dividing steel belt by phases through electrifying and roasting according to the downtrend of voltage; and when most materials in the gaps of the anodes are smelted and communicated and both the electrolyte height and the roasting temperature meet requirements, supplementing part of electrolyte to the electrolytic cell and then starting the electrolytic cell. The method has the advantages of short roasting time, less electricity consumption, safe and reliable control of roasting process, low producing cost, and the like.

Description

technical field [0001] The invention relates to a method for starting the roasting of an aluminum electrolytic cell, in particular to a method for starting the roasting of an aluminum electrolytic cell with a cathode special-shaped carbon block. Background technique [0002] At present, the commonly used methods for starting the roasting of aluminum electrolytic cells at home and abroad include: coke grains, aluminum liquid, and gas roasting methods, etc. The roasting start-up methods for aluminum electrolytic cells involving cathode shaped carbon blocks include: roasting methods such as aluminum liquid, gas, and aluminum ions. And the technology is not mature. For example, there is an existing aluminum liquid roasting method for aluminum electrolytic cells with special-shaped cathode carbon blocks. The high-temperature aluminum liquid is directly poured into the electrolytic cell at room temperature, which has a strong impact on the negative carbon block of the cathode; the...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for starting the firing of an aluminum electrolytic cell, so as to overcome the long firing time, high power consumption, easy occurrence of anode bias current during the firing process, and difficulty in controlling the firing process in the prior art. Defects such as large size and high production cost

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