CN101838821A - Novel lining of aluminum electrolysis cell - Google Patents

Abstract

The invention discloses a novel lining of an aluminum electrolysis cell, which is produced by metallic aluminum, is the cell body of an electrolysis cell of main equipment, and is positioned below a molten poll of the aluminum electrolysis cell; the existing electrolysis cell lining is constructed by material entities, such as fireproofing tiles, insulating bricks and the like, acts the functions of heat insulation and bearing; the novel lining of the aluminum electrolysis cell utilizes coal ash and a support beam to bear, utilizes the air in the closed space constructed by the bottom carbon block and the support beam to insulate heat, thus achieving the heat insulation effects of entity construction, such as fireproofing materials and heat insulation materials; and the invention has important economic benefit and social benefit of simple construction, reduced cost, improved environment and prolonged cell service life.

Description

Novel lining of aluminum electrolysis cell

Technical field: novel lining of aluminum electrolysis cell, belong to metallurgical equipment, be the main equipment that metallic aluminium is produced, the some of electrolyzer cell body.

Background technology: aluminium cell (this only refers to part in the pot shell) is the main equipment that metallic aluminium is produced.It can be divided into two portions up and down: top is to be stuck with paste to make firm by ramming by side wall carbon block, bottom charcoal piece and charcoal to link the all-in-one-piece molten bath; Be the supporting body that constitutes by refractory brick, anti-bleed, insulating brick etc. below the molten bath, supporting the weight in molten bath etc.Under the working order, the melt temperature in the molten bath has about 950 ℃.This temperature be by direct current by anode to negative electrode, particularly realize through the resistance heat of sodium aluminum fluoride molten mass.Temperature is low excessively, and cryolite melts can solidify, and production can't be carried out.Temperature is too high then can to cause environmental degradation, and productive capacity degenerates, and energy expenditure increases.So the good insulation of electrolyzer is most important, be the essential condition that realizes high-quality, high yield less energy-consumption.

The world today, the capacity of aluminium cell is from tens thousand of amperes to hundreds thousand of amperes.The variation of tankage only is the change of size, and its inner lining structure all is essentially identical.As shown: (accompanying drawing 1)

In process of production, ionogen (being dissolved with the cryolite melts of aluminum oxide) can slowly ooze out from the pore of bottom charcoal piece, and exudate contacts with refractory brick, and chemical reaction at high temperature takes place, and produces mineralizer.Mineralizer is long-pending more thick more, finally causes the irregular protuberance of bottom charcoal piece, makes the charcoal interblock produce the crack, finally causes the electrolyzer breakage, the stopping production overhaul.In the cycle of operation of China's electrolyzer about 5 years, higher slightly abroad.

To the overhaul of damaged electrolyzer, mainly be molten bath part and the parts such as the refractory brick below the molten bath, insulating brick of changing carbonaceous.The electrolyzer of one 20 Wan An training needs about 30 tons of the carbonaceous material changed, cubic meter surplus the materials 30 such as fire-resistant, the insulation of replacing.

Summary of the invention: novel lining of aluminum electrolysis cell only relates to the change of structures such as fire-resistant below the electrolyzer molten bath, insulation and material, and does not change the normal construction of molten bath, charcoal pond part.

The electrolyzer novel lining, the load-bearing heat preserving mode that does not adopt entity to construct.But come load-bearing with flyash and supporting beam, realize the insulation of cell body with the air of enclosed space.As shown: (accompanying drawing 2)

Description of drawings:

Fig. 1 is the internal lining of aluminium electrolytic bath drawing in side sectional elevation; Annotate: 1, side wall carbon block 2, bottom charcoal piece 3, cathode bar 4, refractory brick 5, anti-bleed 6, insulating brick 7, calcium silicate board with microporous 8, steel tank shell

Fig. 2 is the novel lining of aluminum electrolysis cell sectional view; Annotate: 1, side wall carbon block 2, bottom charcoal piece 3, cathode bar 4, supporting beam 5, flyash 6, steel tank shell

Specific implementation method

1, foreign material in the pot shell are cleaned out, and at the pot shell two ends and two big faces put on spacing line;

2, with flyash (H ₂O＜3%) completely spreads bottom land, strickling, tamp elevation dimension;

3, with prefabricated refractory concrete plate, be placed on the flyash, surround a rectangle according to the size of having marked;

4, on the rectangle flyash that surrounds, place one deck strength ratio higher, the about two centimeters cement plate of thickness, or other material;

5, hang bottom charcoal piece.The outer rim of bottom charcoal piece will be alignd with the outer rim of supporting beam;

6, adjust bottom charcoal block gap, and be inserted with the lath of sufficient intensity at charcoal block gap place.The thickness of lath will be slightly smaller than the break joint of bottom charcoal piece, and width will be a bit larger tham the spacing between bottom charcoal piece and cement plate.

Arrive this, construction of the present invention is finished.Remaining lining processing still can carry out according to each tame conventional construction method.

Claims (3)

1. flyash is used as the inner lining material of electrolyzer;

2. adopt the supporting beam load-bearing;

3. bottom charcoal piece, supporting beam and flyash are surrounded by enclosed space.

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