DE2244899A1 - BRIQUETTES FOR THE PRODUCTION OF SILICONE ALUMINUM - Google Patents

Description

Dneprovskij Ordena Lenina Aljuminievyj Zavod imeni S.M. Kirova

Zaporoz ■ e / USSR P 46 250/2

13. ' September 1972

RN / Br

BRIQUET TO. MANUFACTURING OF SILIKOiLUI £ LliIÜM

The present invention relates to electrometallurgy of aluminum and silicon, namely compositional of briquettes, which are used for the production of silica aluminum by means of used in ore-reducing smelting in electric arc furnaces will·

According to the known technologies, aluminum is produced from alumina by means of electrolysis, with the slectrolysis being exposed to high-quality bauxites (with an Al ₂ O content of over 50%) Have alumina content.

For a long time the world has been looking for possibilities », for the production of aluminum silicon

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ORiGlNAlIINSPECTED

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Alloys to use ifaturaluminum silicates, which are used as Main components contain aluminum and silicon

One result of this research was the introduction of a process by the USSR for the production of sill coal by the implementation of an ore-reducing smelting of. Briquettes made from a low-elsenic kaolin p5 (Al ₃ C ^ 2 SlO ₂ ) with an aluminum oxide content of 37-39 wt. ^ 5, an iron oxide content of 0.6-1.0 GeWfJ and clay (with an Al ₂ Ox content of 98-99 ^) in electric arc furnaces using various carbon materials (gas coal, petroleum coke, etc.) as reducing agents. Said composition of Beschikkungsgutes (briquettes) to produce Sillkoaluminium has the following Kachteile · During the _two he -reduziexenden melting before the reduction processes is a melting <* he briquettes through the formation of mullite from kaolin according to the scheme)

O ₅ .2SlO ₂ + 4 Si O ₂ at temperatures up to 155O ⁰ C instead. The lowering of the feed into the reduction zone is not regulated; Often both a collapse of the charge and the formation of "galls" can be observed, which lead, on the one hand, to the penetration of significant amounts of non-reduced briquettes into the reduced ketallic phase and, on the other hand, to penetrate through the "galls" A significant amount of cto feed and gaseous suboxides

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of aluminum and silicon are carried out

The so-called "primary alloy" to be produced in the furnaces therefore contains a significant amount of slag in the form of non-reduced aluminum and silicon o2cyden and their carbides »Usually the alloy has one Slag content from 12 to 15% by weight, this being slag retain about the same amount of the reduced metal phase during decantation · The total yield of "primary Alloy "in the form of silica-aluminum is about 65-68 Güw%. For further smelting, the consumption of Electrolyte aluminum for the production of SilumXn approx. 720 kg / t.

The purpose of the present invention is elimination the disadvantages mentioned above,

The invention was based on the object, briquettes for the production of silica aluminum with a To create composition that allows for the reduction of briquettes

in an oven without prior melting under the guarantee a regulated decline of the loading into the ■ reduction zone. This task was done by the creation of a briquette for the production of silicon aluminum by means of ore-reducing melting in an electric arc furnace dissolved, which is a carbon reducing agent, Contains clay and kaolin, according to the invention, this Briquette additionally disthensilimanite with the following

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ratio of components (wt%) contains: Carbon Reducers 30 to 40 Sonords 4 to 20

Kaolin 8 to 40

Dlsthensillimanit everything else

The composition according to the invention is based on the fact that nature uses aluminum sulfate, methylene chloride Contains 10 to 21% by weight of methylene, the one special high thermodynamic strength compared to the Has other aluminum silicates and when heated a mixture of Mulllt and Tonarde with a melting temperature the liquid phase of about 1810 ° C. This fact enables the reduction of the oxides from one not yet melted charge In case of good mixing of the oxides with the reducing agent At the same time, the composition according to the invention allows .Aluminum and silicon in maximum amounts with "one: Reduce the reduced slag content of the enamel products. This also creates the conditions that contribute to a reduction in carbide formation; it 7; the electrical conductivity of the load is lowered, resulting in better use of the furnace's performance leads·

The use of disthensilnanite as a component the briquette rises to the intermediate due to the loading ata

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Gout bottom of a Erzverhüttungsofens the briquettes "This contributes to a more even furnace cycle without" gall "and collapses of the feed as well as to a stable position of the central part of the furnace at _s of the sources by increasing the mineral components a 'of the main, to the formation of unreduced oxides depicted

A laboratory test of the brick composition according to the invention showed that with a parallel reduction of the kaolin and alumina feed and the feed prepared using the above-mentioned Dlkettzusatzsatz at a temperature of 175O ⁰ C the Reduction of the charge containing dlst & ensilX & eaanXt proceeds significantly more completely and faster ', (After 65 minutes the reduction of the kaolin = - alumina Bq charge reaches 9 ° wt .% is adjustable) «,.

The following is an implementation proposal We also carried out the erike6t composition used contained (wt ^);

Dlsthenslllimanit 20 * ■

Kaolin. 25th

Clay 25

Carbon Reducers 30

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The briquette was charged by dosing the components with an accuracy of + 1% by weight in dosing devices for continuous operation / careful premixing of the same and subsequent briquetting in V / as briquette pressing using a binder additive in the form of a sulphite-alcohol lye to a moisture content of 14-16%, drying in belt dryers with gas heating at a temperature of up to 200-23O ⁰ C to a moisture content of Λ%

The mechanical compressive strength of the ellipsoid-like briquettes with a size of 60 × 40 mm was 120 to 180 kp / cm ² .

The Konnzifformn of the smelting of SililroaliumInlum in a furnace mil; a performance of 11 ΙΛΊ are listed in the Tabu LIa.

Kaolin-Disthensillima-Tonurde- '< nit enthalüendo Rrlkottij briquettes

1. Electric power consumption
per Τοηηΰ Sllikoaluulr-iuti (kV / li) 1ÜÜ00 10200

2. Consumption pru ' 111- • 2400 1700 880 780 a) koaluminiuu (kg) from: kaolin Clay

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c) Dlsthensillimanlt - 480

3. Consumption of electrolyte
aluminum per ton

ßllunin (kg) · '718 700

4. Composition of
aluminiun (wt.%)

silicon 38 37 aluminum 57 60 Elsen 1.6 1.5 titanium 0 _s 65 0.65 5 · Yield of carbon dioxide (Gev;.%) 67 72

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Claims (1)

P 46 250/2 13 September PATENT CLAIM: Briquette for the production of Slllkoaluminum by ore-reducing melting in electric arc furnaces, the contains a carbon reducing agent, clay and kaolin, dad u-r ch characterized that it. additionally Disthensilimanlt with the following ratio of components (in% by weight) ' contains: Carbon reducing agent - 30 to 40 alumina - 4 to 20 Kaolin - 8 to 40 Disthensllllmanit - everything else · 309812/0917