Low polar distance energy-saving production method for aluminum electrolysis bath

Abstract

The invention discloses a low polar distance energy-saving manufacturing method for an aluminum cell, which meets the requirement of energy balance by adjustment of technical parameters on the basis of the prior art, comprising the steps that: firstly, voltage adjustment, namely the set voltage of the electrolytic cells is adjusted to be 4.1 volts in the first two weeks, adjusted from 4.1 volts to 4.05 volts in the third week, adjusted from 4.05 volts to 4.0 volts in the fourth week and adjusted from 4.0 volts to 3.99 volts in the fifth week; secondly, adjustment of the aluminum level and the electrolyte level, namely cryolites or electrolyte blocks are added for improving 1 to 2 centimeters of the electrolyte height and the aluminum level is improved 1 to 2 centimeters or so by use of three to five weeks; thirdly, improvement of the molecule ratio and reduction of the superheat degree, namely the molecule ratio is improved from the prior 2.2 to 2.3 to 2.35 to 2.45 within three to five weeks by adoption of the method for reducing the addition amount of aluminum fluorides. The improvement of the primary crystal temperature and the reduction of the superheat degree play an important role in stabilizing electrolyte production, play a certain role in formation of a hearthside and a furnace cavity, and enable the hearthside and the furnace cavity to enter the state of normal production in advance.

Description

Technical field: [0001] The invention relates to a production process of electrolytic aluminum, in particular to an energy-saving production method with low pole distance of an aluminum electrolytic cell. Background technique: [0002] With the development of aluminum electrolysis today, energy saving and high efficiency are the inevitable way. Therefore, how to save energy and produce efficiently has become an industry research topic. At present, the domestic electrolytic aluminum industry still generally adopts the traditional operation process of high pole distance, low molecular ratio, and blindly pursuing low bath temperature. The obvious defect is still the high power consumption per ton of aluminum; Aluminum costs have been greatly affected. If the cell voltage is reduced too much, the heat balance of the electrolytic cell will be damaged due to the influence of the general electrolyte composition, and it will not be possible to maintain a regular and good internal s...

AI Technical Summary

Problems solved by technology

The traditional operation process is mainly to adjust the electrolyte composition at a high pole distance, that is, a higher cell working voltage, to form a low molecular ratio electrolyte composition, so as to achieve low-temperature electrolysis production under high voltage and improve current efficiency. , but this production process leads to higher DC power consumption per ton of aluminum

[0003] Because the traditional process determines the production state at a higher pole distance of the electrolytic cell, it cannot maintain stable operation at a lower working voltage or pole distance