Technological briquettes for non-ferrous metallurgy and the method of its manufacture

 

(57) Abstract:

The invention relates to the briquettes containing waste silicon, designed for non-ferrous metallurgy, and to methods for their manufacture. Technological briquette includes a waste of silicon, water and optionally contains starch in the following ratio, wt.%: waste silicon 94, starch, 0.5 to water of 5.5. Thus the range of particle sizes of silicon is 0.1 to 3.0 mm, the manufacturing Method involves mixing waste of silicon and water and briquetting the mixture. When mixing in the waste silicon add the starch, when this water is used in the amount of 5.5% by weight of the mixture. Manufactured briquettes are subjected to drying. Drying is carried out at a temperature of 20-28oWith in 12-24 hours the Invention allows to obtain a mechanically stable briquette simple and economical manner with a 100% absorption of silicon at its introduction into the melt. 2 S. and 1 C.p. f-crystals.

The invention relates to the briquettes containing waste silicon, designed for non-ferrous metallurgy, and to methods for their manufacture.

Primarily, the proposed briquettes will find application in the production of aluminum-silicon alloy used for the impregnation of silicon carbide electromagne the crucible for the production of aluminum-silicon alloy, fine and dust-like fraction to rise up and salakovac the mouth of the neck, resulting in the crucible fails. Therefore, the waste fraction of silicon less than 3.0 mm in production does not apply.

Aluminum-silicon alloy contains usually 18-28% silicon. Silicon is introduced into the melt in the form of pieces the size of 20-50 mm Waste silicon (small and pulverulent fraction) after crushing silicon are typically not used and go to the dump, which reduces the use of silicon and increases its loss. The introduction of small melt fractions difficult (Altman, M. B. and other Smelting and casting of light alloys, M, metallurgy, 1969, 270).

In a known method of producing briquettes comprising silicon-containing residues, the patent 2124058 (IPC With 22 1/242, 1998), the briquettes obtained by mixing silicon-containing residues (which are formed in the form of dust, obtained by crushing or fracture of elemental silicon) with a cardboard fibre and Portland cement, adding a mixture of water and formation of the resulting pasty mixture of pellets by compacting under pressure.

In the embodiment of the patent 2124058, which is taken as a prototype, it was proposed to use silicon-containing residue as EXT is misteriosa residues using a pressing pressure.

Disadvantage: the manufacture of such briquettes requires special equipment for pressing components and special technological process. This complicates and increases the cost of their production.

The task of the invention is to create a process of briquette for use in non-ferrous metals, including waste silicon (small and particulate fractions) with a 100% absorption of silicon at its introduction into the melt and receiving briquette efficient and economical manner.

The problem is solved in that the technological briquettes for non-ferrous metallurgy, including waste of silicon and water, according to the invention, further comprises starch in the following ratio, wt.%: waste silicon - 94, starch and 0.5, the water is 5.5, while the size of the particles of silicon are in the range of from 0.1 to 3.0 mm

A method of manufacturing technology of briquette for nonferrous metallurgy, comprising mixing the waste of silicon and briquetting, according to the invention, when mixing in the waste silicon add starch and water, and after briquetting produce drying. Drying is carried out at t=20-28oWith in 12-24 hours

At a temperature of less than 20oWith time and the education. This in turn promotes the release of metal from the crucible, dangerous to operating personnel, and disruption of the process of impregnation of the heater. Besides this there are large investment of time for drying of the briquettes.

When the temperature is more than 28oC and the drying time more than 24 hours adhesive loses its properties - adhesion of the substance is reduced, which leads to changes in the structure of the briquette: increases the porosity and friability of the briquette; decreases its density. When a small density due to the large porosity of the pellet comes out the air, and starts bubbling metal, which affects the process of impregnation of electric surface heater turns rough, resulting in a product goes into marriage.

The presence in the waste briquette silicon with a particle size in the range from 0.1 to 3.0 mm, provides the possibility of processing pulverulent and fine fractions at the expense of 100% of their use and comprehensibility. Introduction starch to create briquettes will get it in a simple way. Starch when using briquettes in the melt, burn and does not adversely affect the quality of the melt.

STRs and particles, adding by mixing starch and water and drying at room temperature for 12-24 h can be obtained in a simple and economical manner.

Conducted patent studies have not found a similar technical solutions that allows to draw a conclusion about the novelty and inventive step, because the solution is not clear from the current level of technology.

The proposed solution can be applied in ferrous metallurgy in the production of aluminum-silicon alloys. The domestic industry has all the resources (materials, equipment) required to obtain the proposed briquettes and their use in industry.

The essence of the proposed technical solution is illustrated by description of a specific implementation technology of briquette and method of its manufacture.

In the proposed briquette used waste silica with particle sizes 0-3,0 mm Mass ratio of waste silicon, starch and water inside the briquette is preferably 94 respectively, of 0.5 to 5.5%. The starch used according to the invention may be selected from starches of any kind and, in particular, from natural tx2">

Below is an example of manufacturing briquettes according to the invention.

In the capacity of the injected waste silicon 9,4 kg, starch 50 g and water quantity - 550,

- Carry out mixing until smooth.

- Form the briquettes and put them to dry on the pallet.

- Drying is carried out at room temperature 20-28oWith in 12-24 hours

- Obtained dried briquettes are Packed in a box, convenient for transportation.

The briquettes produced in this way can be used in non-ferrous metallurgy in the production of aluminum-silicon alloys as the sole source of silicon or in combination with a large crystalline silicon. The digestibility of them in the melt is 100%.

The proposed method of manufacturing technology of briquette allows simple and economical way to obtain a mechanically stable pellets, dried at room temperature, i.e., to reduce energy consumption.

1. Technological briquettes for non-ferrous metallurgy, including waste of silicon and water, characterized in that it further comprises starch in the following ratio, wt.%: waste silicon 94, the collapse of the technological briquettes for non-ferrous metallurgy, includes mixing waste of silicon and water and briquetting the mixture, characterized in that, when mixed in the waste silicon add the starch, when this water is used in the amount of 5.5% by weight of the mixture, and manufactured briquettes are subjected to drying.

3. The method according to p. 2, characterized in that the drying is carried out at a temperature of 20-28C within 12-24 hours

 

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