DE2244899C3 - Briquette for the production of silicon aluminum - Google Patents

Description

Kaolin- Disthensilli- Alumina manite Briquettes containing. Briquettes

3 4

containing charge can be reduced by up to 98 to 99.5 percent by weight).

The following is an embodiment of the invention cited. The briquette composition used contained 5

Weight percent ₁ _,,,,

r -.-., · "■ -. , _ I. Electricity consumption

Disthensilimanite 20 -τ- οι-, ■ · ·

_. per ton of silica aluminum

Carbon reducing agent 30 io 2. Consumption per ton of SiIi-

koliumnium (kg) from:

The charging for the briquette was through Do- ^a > Kaolin 2400

sizing the components with an accuracy of b) Alumina 880

of ± I percent by weight in dosing devices for ^c ) Disthensillimar-it -

steady operation, careful mixing of the same 15 3. Consumption of electrolyte

and subsequent briquetting in roller briquette aluminum per ton

pressing using a binder additive Sillumin (kg) 718

in the form of a sulphite alcohol lye except for one. "

Moisture content from 14 to 16%, drying in ⁴ "composition of

Belt dryers with gas heating at a temperature * o Silicoaluminium (weight

up to 200 to 230 ⁰ C except for a moisture Pf.? ^z . ^ent),.

content of 1% processed. ^ ^{1 mum 3} A

The mechanical compressive strength of ellipsoidal aluminum 5 /

borrowed briquettes with a size of 60 × 40 mm ² was 5 :! ^sen !. ';?

120 to 180 kg / cm ² . 25 ^{lltan U} ' ^{ö :)}

The data in the prevention of silica aluminum 5. Yield of silica

: n a furnace with an output of 11 MW are made of aluminum (weight pro-

listed in the table. cent) 67

10200

1700 780 480

700

37

60 1.5 0.65

72

Claims (1)

1 2 From the specialist literature (B e 1 j a j e w, A. J. Metallur- Patentai.sprach: gie des Aluminums, Volume II, VEB Verlag Berlin, 1957, pp. 125 to 127) is the use of thistle Briquette for the production of silicon aluminum as a raw material for aluminum-containing alloys ore-reducing melting in arc 5 knows. furnace, which is a carbon reducing agent, clay- The present invention is to- Earth. Containing kaolin, thistle and sillimanite, there is a way to show how natural characterized in that there are di- occurring raw materials with relatively low currents and sillimanite in the form of 10 to 21 use silica aluminum with high yield weight percent Disthensilli- io containing disthene can be obtained by making an even abmanite with the following ratio of the components melt at relatively low temperatures guaranteed Percentage by weight contains: is performed. According to the invention, this is used in a briquette Carbon reducing agent .. 30 to 40 Manufacture of silica-aluminum by reducing ore-alumina 4 to 20 15 of the melting in an electric arc furnace, which is a coal kaolin 8 to 40 reducing agents, clay, kaolin, thistene and Disthensillimanit contains the remainder of sillimanit, achieved by the fact that it contains thistle and sillimanite in the form of disthensillimanite containing 10 to 21% by weight of disthene 20 contains the following ratio of components in percent by weight: Weight percent Carbon Reducers 30 to 40 Alumina 4 to 20 25 kaolin 8 to 40 Disthensillimanite rest The invention relates to a briquette for producing Hel'une of silicoaluminum through ore-reducing by the fact that thistle and sillimanite in the mold Melting in an electric arc furnace containing a carbon from 10 to 21 percent by weight of thistene Reducing agents, clay, kaolin, disthene and Sillt-30 Disthensillimanit are used to complement each other contains hianit. Properties of these in the crystal chemical structure It is known that silicon aluminum can be obtained by melting briquettes, which are largely reduced in their reduction behavior, and which are optimally made from different raw materials, and low-iron kaolin [3 (Al ₂ O ₃ · 2 SiO ₂ ) together with the specified amounts at temperatures from 155o C. to kaolin alumina content from 37 to 38 weight percent, 35 to a liquid an iron oxide content from 0.6 to 1.0 Gewichispro- Molithphase is formed while otherwise purpose of Fcent] and alumina (Al ₂ O ₃ with a -Content from 98 to Disthensillimanit temperatures of 1800 ³ C required-99%), are lent in an electric arc furnace. This makes it possible to considerably reduce the electrical energy consumption of various carbon materials per ton of silicon aluminum (gas coal, petroleum coke, etc.) as a reducing agent 40 », and thereby to produce the invention. In the course of the ore-reducing small raw material ratio the reduction of the Disthen-Kns takes place, however, before the start of the reduction processes containing sillimanite, the briquettes melt away significantly as a result of the formation of more and more complete mullite can be borrowed from kaolin according to the formula Increase in yield can be achieved. Equal- The prerequisites are also created in good time 3 (Al ₂ O ₃ ■ 2 SiO ₂ ) -s- Al ₂ O ₃ · 2 SiO ₂ + 4 SiO ₂ which contribute to a reduction in carbide formation wear, and it will increase the electrical conductivity of the at temperatures up to 1550 ° C. As a result, the load is lowered, which leads to a better effect Lowering of the feed leads to the degree of reduction. Eventually the use of zone not regulated, there are both collapses of the 50 disthensilimanite as part of the briquettes Sending as well as the formation of "galls" to sinterability of the charge at the bottom of the gout watch that lead to the one hand in the ore smelting furnace by an enlargement of the reduced metal phase significant amounts of non-mineral components of the briquettes. That contributes to with reduced briquettes and, on the other hand, through a more even oven without "galls" and dii »Gallen« a significant amount of loading 55 collapses of the loading as well as a stable one and gaseous oxides of aluminum and the location in the central part of the furnace where one of the main Si'iziums be carried out. The formation of non-reduced oxides swells in this way, The alloy contained therein therefore still contains important A test of the briquette according to the invention Amounts of slag in the form of unreduced composition in the laboratory showed that with a parallel reduction of aluminum and silicon oxides and their carbides 60, the kaolin-alumina charge in an amount of 12 to 15 percent by weight, with kung and the using the above, during the deslagging process, these slags retain about the same amount of reduced metal phase as mentioned above. The feed at a temperature of 175O ⁰ C the total Re yield in the form of silica aluminum is reduction of the disthensillimanite-containing loading therefore only about 65 to 68 percent by weight. With the 65 kung much more complete and faster before further contraception, the consumption of elec- tric goes. (After 65 minutes, the reduction of the trolyte aluminum for the production of silumin reaches about 90 percent by weight kaolin-alumina loading and 7? N volts thus practically ends, while the disthensilimanite