SU1752830A1 - Method of arranging pins in self-firing anode of aluminium electrolyzer - Google Patents

Abstract

Usage: the invention relates to the metallurgy of non-ferrous metals and coins to be used in the production of aluminum. SUBSTANCE: method of placement of pins in a self-biking anode of an aluminum electrolyzer with a two-way current lead includes connecting rows of anode pins to anode pins and placing pins along the height of the anode. The anode pins of each row are connected to the package of electrically isolated anode busbars and set them relative to the anode base at a distance including the anode height inversely proportional to the resistance of the busbars supplying current to the anode rods m. 2 Il.

Description

The invention relates to the metallurgy of aluminum, in particular to a method for producing aluminum by the electrolysis of molten salts.

Known methods for placing pins in a self-fired anode of an aluminum electrolysis cell with a two-way current lead to the anode include placing the pins along the anode height on two horizons at an equal distance and the lengths of each horizon from the anode base and placing the pins in the row with each row of pins connected to one anode bus .

The disadvantages of these methods include connecting each anode pins to one anode bus, placing the pins of each horizon at an equal distance from the bottom of the anode, uneven supply of current1 to the anode at the input end, middle and

its output end, due to the uneven resistance of the current-carrying pin, due to the different lengths of these tires, which supply current to the input and output ends of the electrolyzer.

The aim of the invention is to increase the current output of the metal by increasing the uniformity of the current lead to the anode.

The goal is achieved by connecting the anode pins of each row to the package of electrically isolated anode tires and placing them relative to the anode base at a distance including the height of the anode inversely proportional to the pin resistance leading to the anode pins m.

Pa figure 1 shows a diagram of the connection of the anode pins to the packages electr

but

N2

OS

ABOUT

317

rpchsch no tinted anodic pieces and (iimt anode unit with tires for current sinks, in Fig. 2 - pin allocation scheme relative to the anode base (numbers 2-6 show tons of connecting pins to anode tires, indexes IV - measuring points of potential difference on side surface of the anode above the electrolyte level).

The essence of the method is as follows.

Connecting each row of anode pins 1 to an anode busbar package 2-6, electrically isolated between them, in the connection area of the pins creates a partitioned current lead to the anode, increases the uniformity of current load distribution on the anode tires.

Placing the pins relative to the anode base at a distance including the anode height, inversely proportional to the resistance of the busbars supplying current to the anode pins, ensures equal resistance on the current-carrying sections from the cathode tires of the previous electrolyzer to the electrolyzer anode, to to which the current supply is carried out, thereby increasing the uniformity of the current supply to the anode and to the cathode metal, which reduces the formation of horizontal currents in the metal, its circulation and skewing of the surface.

The distance by which the position of the pins of one horizon from the bottom of the anode, including the bottom of the% anode, inversely proportional to the resistance of the busbars supplying current to the anode pins m, should be changed by the formula

/ and -j (ji

Pa da

"SLO

de D1 - the difference in the position of the pins

Ьш - length

bt the soles of the anode, cm

Iini to the appropriate group of anode pins;

Lfl is the shortest bus length that supplies current to the nearest anode rod group

d ..- current density in tires, L / cm 2,

tire resistivity, Ohm. cm ,

R

s

Ti - current density on

the sole.

pM

thirty

anode, L / cm2 J

specific resistance of carbon anode below

Ohm, Ohm "see

Example. On an industrial electrolyzer, the rows of anode pins 1 are connected to electrically insulated buses 2-6 and the pins of each horizon are installed at a height of the anode below ptyry connected to bus 2 by 2 cm and connected to bus 3 by 4 cm the first two along the current the pins connected to bus 4 are 10 cm long — two ptyrs connected to this bus, 8 cm pins connected to bus 5, and 6 cm pins connected to pin 6.

The results of measurements of the potential difference between the potential points on the side surface of the anode above the electrolyte level with the placement of pins by the proposed and known methods are shown in the table.

thirty

I-II I-III

I-IV I-V

50 15 48 25

eight

12

ten

15

From the table it can be seen that in the proposed method of increasing the equipotentiality of the anodia of the pins indicates an increase in the uniformity of the electrical power supply to the substrate of the anode and to the cathode metal.

The use of the proposed method will allow increasing the current efficiency by 0.3-0.5%.

Claims (1)

Invention Formula The method of placement of the pins in the self-firing anode of the aluminum electrolyzer with a two-way current supply circuit. inclusive connection series 517) 28.f) 6 .ST. ,,,, UMI, .. b Lmods,, „, sham„ -k nnfery OIU, KTPH4P (I and Itpiro. pa SHRGCHRNIS mcnrry but PYGOTR anode from its basement, which means that, with CRLL, increases the current output due to the increased uniformity of the current lead to the anode, anode pins of the rear row are connected between the oboe anodic pin and the mouth in, send them down relative to the basement, ino, on the split, including the height yes, inversely proportional to match the singing of the state, supplying them (their current to the bottom line). between the oboe anodic pin and the mouth, they send them relatively to the basement, ino, m on a rag that includes the height of the chord, inversely proportional to resist in gsn, the supply of r (their current to the anode of the anode). FIG. I / 6 5IG. 2