CN100339491C

CN100339491C - Method for processing raw materials for producing ferra silicon alloy, silico-calcium and monocrystalline silicon

Info

Publication number: CN100339491C
Application number: CNB2006100040574A
Authority: CN
Inventors: 吴兴明
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-01-26
Filing date: 2006-01-26
Publication date: 2007-09-26
Anticipated expiration: 2026-01-26
Also published as: CN1814824A

Abstract

The present invention relates to the smelting technical field, particularly to a processing method for producing the raw material of ferric silicon, calcium silicon and monocrystalline silicon in an electric smelting furnace. The processing method is characterized in that according to the ratio of SiO2: C=1: (0.4 to 0.6), SiO2 and carbon are respectively crushed into fine powder in 200 to 300 meshes; 1 to 3 wt% of pure starch glue is firstly added, and then 1 to 5 wt% of water in balling is added; the mixture is uniformly stirred by a stirrer, shaped by pressing by a shaper, and finally aired and dried in natural environment. The method provided by the present invention can raise output by one third and largely reduce power consumption.

Description

A kind of working method of producing the raw material of ferrosilicon, silico-calcium and silicon single crystal

Technical field

The present invention relates to technical field of smelting, especially relate to a kind of working method of producing the raw material of ferrosilicon, silico-calcium and silicon single crystal in the electric smelting furnace.

Background technology

At present, the smelting of ferrosilicon and silico-calcium, it is the granularity that carbon raw is crushed to 10～30mm, silica: large capacity electric stove is processed into the bulk of 40～120mm, be processed into the bulk of 25～80mm below the electric furnace 3000kva of low capacity, go into stove production according to the certain proportion of silicon-dioxide and carbon element, adopt this raw material production, because coal, raw materials such as silica all have certain particle, especially coal, it does not melt in smelting furnace all the time, works as silica, after the lime fusing, on the surface of coal with progress in the hole of coal, just can carry out chemical reaction, the contact area of reactant is very limited like this, thereby chemical reaction velocity is slower, thereby has seriously influenced output, and be accompanied by the raising of energy consumption, adopt present raw material production generally to have a daily output of 20～25 tons, ton power consumption 8400～9000kvA, the ton power consumption of silico-calcium is at 13000kvA; This shows the raw material that adopts present working method to produce, its power consumption is very high, and serious wastes energy, and yields poorly.

Summary of the invention

The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of and can reduce power consumption, obviously improve a kind of working method of producing the raw material of ferrosilicon, silico-calcium and silicon single crystal of output.

The present invention realizes in the following way:

A kind of working method of producing the raw material of ferrosilicon, silico-calcium and silicon single crystal is characterized in that: according to weight ratio is SiO ₂: C=1: the ratio of (0.4～0.6), respectively silicon-dioxide and carbon raw are crushed to 200～300 purpose smalls, adding weight percentage earlier therein is the pure amylan of 1-3%, the moisture content that adds into the 1-5% of ball weight again, then it is stirred with stirrer, again by roller briquetting machine compression moulding, then airing in physical environment, drying;

Described roller briquetting machine is the pair roller ball-and-socket middle pressure shaper of pressure greater than 25MPa, 20x30;

The weight percentage of described carbon raw is: coke 50%, hard coal 30%, stone tar 20%;

The weight percentage of described carbon raw is: coke 50%, hard coal 50%;

The weight percentage of described carbon raw is: coke 50%, hard coal 40%, wood chip 10%;

Described wood chip is clean, the native also process of nothing exsiccant;

The weight percentage of fixed carbon 〉=84% in the described carbon raw, ash≤15%.

The present invention has following effect:

The height of electric smelting furnace's output is exactly the branch of the speed of chemical reaction velocity, and traditional smelting process, the limited contact area of carbon raw and silica are to hinder the key point that speed of response improves.If bumping with a silicon dioxide molecules, two carbon atoms are in the same place, temperature is in the time of 2000 ℃, speed of response is quickish, also faster than congruent melting speed, but the raw material coke of electric furnace is block, do not exist with atomic condition, have only the silica of fusing to react with carbon on the surface of carbon and in the pore of continuous infiltration coke, measured response contact area has like this hindered greatly the speed of chemical reaction; And the raw material that adopts method provided by the invention to produce, silica and coke all are 200～300 purpose smalls, and two kinds of raw materials mix compressed together, thereby enlarged reaction contact area greatly, when smelting temperature one arrives, the atom and the molecule number of participating in reaction are many, and therefore whole chemical time is just short, so the output in the unit time is just high, thereby the product energy consumption of unit mass is just low.

Method provided by the invention, through evidence, the simple silicon-dioxide burn-off rate of product melting speed ratio is fast, and temperature of fusion is low, and when melting, fusing be silicon.In the production test of silico-calcium stove, went out a stove 4 hours, and original traditional method went out stove need 6 hours, the time has shortened 1/3rd, just equals output and has improved 1/3rd.

Coke and hard coal utilize ball mill or Raymond mill to get final product fragmentation in the raw material of the present invention, and cost is low, is easy to raw material powder is broken into 200～300 purpose powder.The source of silicon-dioxide can be the silica fragmentation in the raw material of the present invention, especially the waste silica powder after the fragmentation of quartz sand field, the content of its silicon-dioxide is up to 99.5%, and its granularity is 200～300 orders, just in time satisfy required for the present inventionly, thereby the tooling cost of raw material reduces greatly.

Under the Helan Mountain in Ningxia, be provided with many coal washerys, produce a large amount of smokeless coal slimes, fineness is 100～300 purpose mixtures, using the foaming process fine purifiation, ash is dropped to below 8%, is very fine, rare carbon raw, because its ash content of coal is low, utilize the content of aluminium in ferrosilicon that such carbon raw produces, the silico-calcium can not surpass 1%.

Embodiment

Embodiment 1: according to weight ratio is Si0 ₂: C=1: 0.4～0.6 ratio, the carbon raw that with silicon-dioxide and weight is coke 50%, hard coal 30%, stone tar 20% respectively is crushed to 200～300 purpose smalls, adding weight percentage earlier therein is the pure amylan of 1-3%, the moisture content that adds into the 1-5% of ball weight again, then it is stirred with stirrer, again by roller briquetting machine compression moulding, then airing in physical environment, drying.

Embodiment 2: according to weight ratio is SiO ₂: C=1: 0.4～0.6 ratio, the carbon raw that with silicon-dioxide and weight is coke 50%, hard coal 50% respectively is crushed to 200～300 purpose smalls, adding weight percentage earlier therein is the pure amylan of 1-3%, the moisture content that adds into the 1-5% of ball weight again, then it is stirred with stirrer, again by roller briquetting machine compression moulding, then airing in physical environment, drying.

Embodiment 3: according to weight ratio is SiO ₂: C=1: 0.4～0.6 ratio, be respectively that coke 50%, hard coal 40%, wood chip 10% carbon raw are crushed to 200～300 purpose smalls with silicon-dioxide and weight, the carbon content 15% of wood chip wherein, adding weight percentage earlier therein is the pure amylan of 1-3%, the moisture content that adds into the 1-5% of ball weight again, then it is stirred with stirrer, again by roller briquetting machine compression moulding, then airing in physical environment, drying.

Claims

1. working method of producing the raw material of ferrosilicon, silico-calcium and silicon single crystal, it is characterized in that: according to weight ratio is SiO ₂: C=1: the ratio of (0.4～0.6), respectively silicon-dioxide and carbon raw are crushed to 200～300 purpose smalls, adding weight percentage earlier therein is the pure amylan of 1-3%, the moisture content that adds into the 1-5% of ball weight again, then it is stirred with stirrer, again by roller briquetting machine compression moulding, then airing in physical environment, drying.

2. a kind of working method of producing the raw material of ferrosilicon, silico-calcium and silicon single crystal as claimed in claim 1 is characterized in that: described roller briquetting machine is a pressure greater than 25MPa, 20 * 30 pair roller ball-and-socket middle pressure shaper.

3. a kind of working method of producing the raw material of ferrosilicon, silico-calcium and silicon single crystal as claimed in claim 1 or 2, it is characterized in that: the weight percentage of described carbon raw is: coke 50%, hard coal 30%, stone tar 20%.

4. a kind of working method of producing the raw material of ferrosilicon, silico-calcium and silicon single crystal as claimed in claim 1 or 2, it is characterized in that: the weight percentage of described carbon raw is: coke 50%, hard coal 50%.

5. a kind of working method of producing the raw material of ferrosilicon, silico-calcium and silicon single crystal as claimed in claim 1 or 2, it is characterized in that: the weight percentage of described carbon raw is: coke 50%, hard coal 40%, wood chip 10%.

6. a kind of working method of producing the raw material of ferrosilicon, silico-calcium and silicon single crystal as claimed in claim 5 is characterized in that: described wood chip is clean, the native also process of nothing exsiccant.

7. a kind of working method of producing the raw material of ferrosilicon, silico-calcium and silicon single crystal as claimed in claim 1 is characterized in that: the weight percentage of fixed carbon 〉=84% in the described carbon raw, ash≤15%.