DD141394A3 - METHOD FOR OPERATING AN OPEN ELECTRONIC LAYER TO PREPARE FERRO ALLOYS AND SILICONE METAL - Google Patents

Abstract

It will be a procedure for operating an open Electric subsea furnace for the production of ferroalloys and Silicon metal described, wherein the use of untreated or unprocessed carbonaceous reducing agents of Expenditure of energy and raw materials as well as the known disadvantages be reduced. According to the invention as carbonaceous Reducing agent Tree bark with a share of up to 100% Cover the carbon used and the Möller on the. Furnace boiler out into the area of the electrode holder constantly loaded. This is a Möller of a silicon Trägef from 50% to 100% quartz pebbles and from 70% to 100% tree barks manufactured.

Description

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Method of operating an open electric downhole furnace for producing ferroalloys and silicon metal

Field of application of the invention

The invention relates to a method of operating an open shell kiln furnace for producing ferroalloys and silicon metal using a carbonaceous reducing agent of lignocellulosic material and the known other minor components.

Characteristic of the known technical solutions In the production of ferroalloys and silicon metal, the carbonaceous reducing agent used is charcoal, anthracite, gas coke, peat coke, coke breeze, petroleum coke, coal, pitch coke and / or mixtures thereof.

However, the entire "process for producing ferroalloys and silicon metal has significant disadvantages, so it is necessary to process and produce the reducing agents in a separate process, thus negating the effect of the manufacturing process on the high energy and material costs". In addition, a high proportion of toxic gases, slags and ashes, Verdarnpfungsprodukten and iron content in SiIiciummetall. There has been no lack of attempts to reduce the material and energy costs and the disadvantages mentioned.

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Thus, the reducing agent used was untreated green wood and sawdust with mixtures of the above-mentioned reducing agents. However, this led to significant further disadvantages in the manufacturing process by once reduced the yield and the reduction rate and on the other hand, the stoichiometric setting of Möllers (complicated weighing equipment) was difficult.

The toxic gases were reduced by post-combustion plants and the evaporation products by special cooling processes.

The proportion of slags and ashes as well as iron content was reduced by special treatment processes for the feedstocks in the Möller.

However, these additional measures have significantly negatively affected the effect of the process of producing ferroalloys and silicon metal.

It has already been proposed to improve the overall manufacturing process and, due to the increasingly expensive raw materials in the market, to replace it with inferior feedstocks by making a mono-oiler from a combination of high quality reducing agents and silicon carriers, as well as inferior reducing agents and silicon carriers. As a result, no improvement could be achieved since. have become larger at specific energy consumption, the already known specialist parts again, so that apart from the use of such a Monomöllers v / earth had to.

Object of the invention

The invention pursues the goal of the expenditure of energy

for the preparation of raw materials in the production of ferroalloys and silicon metal significantly reduce and reduce the known disadvantages.

Character istik of the invention

The invention is based on the object of thus conducting the operation of an open electrotube furnace for the production of ferroalloys and silicon metal,

that the use of treated or unprocessed carbonaceous reducing agents, the object of the invention. Is possible, is. , This is achieved in that as a carbonaceous reducing agent tree bark is used in a proportion of up to 100% to cover the carbon, and that the Möller beyond the furnace boiler out into the area. the electrode holder is charged continuously. The Möller is made from a silicon carrier of 50% to 100 $ quartz pebbles and from 70% to 100% tree bark.

Particular advantages arise when quartz pebbles are used with a grain size of 15 mm to 25 mm. The use of tree barks and the specified management results in a number of unforeseeable advantages, which will be explained in more detail in the exemplary embodiment.

Implementation example .

Reference to an embodiment of the invention will be explained in more detail. The drawing shows schematically the delivered with Möller Elektriederiederschachtofen. For the production of ferroalloys and silicon metal of Möller for delivery in the electric subsea furnace 1 according to the following recipes

a) 200 kg of quartz pebbles 400 kg of tree bark

52 kg of BHT coke;

b) 200 kg of quartz pebbles 400 kg of tree bark

34 kg fission coke;

c) 100 kg quartz pebbles 100 kg quarry 500 kg tree barks

  16 kg BHT coke or

d) 200 kg of quartz pebbles 610 kg of tree bark

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in the stoichiometric ratio, wherein the Mölleranteile except bark by weighing and the bark is determined volumetrically prepared.

The bark can be used as a carbonaceous reducing agent up to $ 100 in the stoichiometric ratio. Particular advantages arise when using grain-less Si carrier, as it represents the quartz pebble with a grain size of 15 to 25 mm. The Möller 3 is with known devices the open Elektriederiederschachtofen 1 so-led that the Möller is delivered up to the area of the electrode holder 4 via the furnace furnace 2 continuously. The Möllerhöhe Il can be driven up to 1.5 m above the Ofenkessel 2.

The tree bark act particularly when using fine-grained Si carrier as Auflockerungsmittel so that the reducing gases are much better distributed and thus increases the reduction rate and the entire production process is accelerated. Through the so-called tree bark is a continuous low-thermal decomposition (pyrolysis) of tree bark in the area between furnace boiler and electrode holder, so that a reduction-friendly reducing agent is formed. At the same time, the toxic exhaust gases are thermally burned by the hoohgezogenen Möller, so that the escaping exhaust gases are no longer toxic and thereby the entire process is environmentally friendly (reducing pollutant emissions). Due to the hoisted Möller, the. Evaporation of silicon reduced by 30% , as the silicon condenses on the colder Möller, especially the tree bark and re-feeds the process through the Möller, so that an increase in yield is achieved.

The iron content of SiI am i amme tails is reduced up to $ 40, so that the increased purity of an advantageous use in the chemical industry is possible «

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By virtue of these advantages arising directly in the production process, the economy has another advantage in that a large amount of secondary raw material from forestry, lumber and pulp industry is no longer disposed of at high costs, but directly without any further processing in the manufacturing process. of ferroalloys and SiIiziummetall deliverable.

Overall, the following advantages can be achieved by the invention:

'1. Reduction of specific consumption of carbonaceous reducing agents »

2, Reduction of specific consumption of Si carrier raw materials

3 * Reduce the specific consumption of electrical energy

4. Increase in production capacity without plant technology change

5. Substitution of rock quartzite by fine gravel

6. Substitution: of high-quality reducing agents by tree bark

7. Increase in yield

8 «Reduction of iron content in silicon metal

9. Improvement of quality by using inclusion-free fine gravel.

10. Improvement of Betfiebsfünrung ΛΛ. Reduction of the "environmental impact

Claims (3)

Erfindüngsansprach Λ, A method for operating an open Slektroniederschachtofens for the production of ferroalloys and silicon metal, using a carbonaceous reducing agent of lignozelluXosehaltigen material and the b.ekannten further Möllerbestandteilen, characterized in that as carbonaceous reducing agent tree bark with a share up to -100 % to cover the Carbon is used, and that · the Möller is fed continuously over the furnace boiler out into the region of the electrode holder. 2. The method according to item 1, characterized in that; the Möller is made from a silicon carrier of $ 50 to $ 100 quartz pebbles and from 70 <# to $ 100 tree barks, .3. Method according to point 2, characterized in that quartz pebbles with a grain size of 15 mm to 25 mm are used. To do this / f page drawing ^