SU1631243A1 - Method of control of arc furnace silicon production process - Google Patents

Abstract

The invention relates to the metallurgical industry, more specifically to the automation of ore recovery furnaces for smelting silicon. The purpose of the invention is to increase the productivity of the furnace. During the smelting process, the flow rate of the electrode and electricity is measured, the degree of presence of carbon in the reaction zone is determined by their ratio, and the corresponding composition of the charge is adjusted accordingly.

Description

The invention relates to the metallurgical industry, in particular to the smelting of silicon in ore recovery furnaces.

The aim of the invention is to increase the productivity of the ore recovery furnace.

The method is based on determining the ratio of solid carbon to quartzite in the mixture according to the relationship between the flow rate of the electrode and the actual amount of carbon in the reaction zone of the furnace. With an excess of carbon in the reducing agent, the consumption of the low-carbon electrode of the electrode decreases; with a lack of reactive carbon charge, the carbon of the electrode enters into the reaction, which increases the consumption of the electrode.

The experimentally established dependence is determined by the expression

K A -9-14 A W

where K is the ratio of solid carbon to quartzite in the charge

q is the electrode consumption;

W - power consumption;

And - the coefficient of specific consumption of the electrode.

Coefficient A is determined in experimental melts as the ratio of the specified change K to the resulting change in the unit-specific energy consumption of the electrode.

In experimental melts on a 1000 kW single-phase electric furnace, the consumption of the electrode and the consumption of electricity were measured. Measurements were carried out periodically - one measurement for each hour of operation of the furnace. By analysis, the CTBI and moisture content of the reducing agents were determined. The amount of carbon and quartzite was determined by weighing each batch on a mailing scale.

Carbon consumption for smelting 1 ton of silicon was Stv 1800 kg. During smelting, the dependence of the change in the ratio of solid carbon to quartzite in the mixtures

those k

Aq

Si02

from a change in attitude

(L

WITH

about with

Yu

CJ

) measured by marks and instruments. During the experimental melting for 6 months

found that a 1.5% change in the K ratio leads to a change in the ratio

Aq

on

5mm

SW ° YuOOkw h opal dependence, i.e.

at right proportions Aq 5

SW 1000 corresponds to A 1800x0.015 for a furnace 1000 kW.

Then the magnitude of the correction K in your Aq those with small changes is possible

determined by the following dependency:

9 - A

SW

Aqi

-Y

Swi

yAqi xSWi

АЈ

sw

SW set ratio for

this furnace;

And - the coefficient of the furnace;

-app-- actual measured ratio.

Aqi

For example, the ratio of rt / hour

4mm

the furnace bots became equal to tt ko; - Then

the excess carbon in the charge is 35

1000

4 1000

-1800x0.015,

-Y

v 0.004 x 1800x0.015 01 to-o, 005-l.okg.

is changing attitudes

SW

In experimental swimming trunks on a single-phase furnace with a capacity of 9000 kW with graphite electrodes, the consumption of carbon for smelting 1 ton of silicon was St 1850 kg. During experimental melting with careful control of the change in electrode consumption, energy consumption depending on the content of STV in the charge, with constant monitoring of moisture, weights and content of STV in reducing agents, it was found that the change in K ratio by 1.5% privoq

on

those.

Aq 4 SW 1000

So1000 kW x puts A 1850xO, 015. Then, with the change in electrode consumption per hour of furnace operation

Zmm for example, up to yooo kWh t is required

reduce carbon consumption by

1850 0.015

1000

3 1000

- Y

15

20

25

thirty

35

40

45

50 55

0.003 X 1850 X 0.015 Y -0 004-l Vcg.

For comparison with the existing method for adjusting the smelting of silicon, consider the prototype adjustment. Melting is carried out on furnaces of 9000 kW, with a carbon consumption of 1 ton of silicon equal to StB 1850 kg. With a constant rise of the electrodes, the transfer of a heavy charge containing an amount of quartzite in the sample increased by 100 kg, i.e. the carbon content changes by about 15–20%. One or several suspensions for descending (landing) the electrodes are applied.

Thus, it follows that the method of associating the stroke of the electrode with the electric mode makes it possible to increase the accuracy of the adjustment of melting by a factor of 8 to 10, since it is adjusted in a known manner with an accuracy of 15-20%, suggested by up to 1% of Stv.

Claims (1)

Invention Formula A method of controlling the process of smelting silicon in an electric furnace, including measuring electricity consumption, determining the ratio of carbon and quartzite in the charge, adjusting the composition of the charge, characterized in that, in order to improve performance, the electrode consumption and the power consumption in the electrode circuit are periodically measured for the period, the current value of the ratio of solid carbon to quartzite in the charge in terms of , where q is the electrode consumption during the measurement period; W is the power consumption during the measurement period; A is a constant coefficient of specific electrode consumption characterizing the operation of the furnace, and on the deviation of K from the value specified by the technology, the composition of the charge is adjusted.