SU771024A1 - Carbon-containing mass for self-burning electrodes - Google Patents

Description

one

The invention relates to the production of carbon-containing products, in particular self-baking electrodes, intended for the smelting of predominantly titanium-containing alloys.

The known carbon-containing mass for self-burning electrodes, containing (wt.%) 39 thermoanthracite, 19 foundry coke, 19 graphitized waste and 23 coal pitch Sch. However, the electrodes obtained on its basis have low mechanical strength.

Also known carbon-containing mass used for smelting titanium-containing alloys, containing (wt.%) 41-49 thermoanthracite, 26-30 foundry coke, 2-4 graphitized waste and 22-26 coal, pitch 2.

The disadvantage of this mass is that the electrodes obtained from it have a high electrical resistance.

The purpose of the invention is to reduce the electrical resistance of the electrodes.

This is achieved by the fact that the carbon-containing mass contains (wt.%) 2.6-28 coke, r-associated waste

1-3, coal tar pitch 22-26, ferro-titanium containing. scrap - 4-6 and thermoanthracite - the rest. Ferrotitanium-containing scrap contains (wt.%) 5 27.5-30 titanium, 5-6 silicon, 3-5 aluminum, 10-12 carbon, 1-2 magnesium, 2-3 k, 1 lee, 1-2 oxygen and iron else. .

Distinctive feature of mass

10 consists in that it additionally contains a ferrotitanium-containing scrap of the indicated composition - waste products of titanium production at a reduced ratio of components.

15 Reducing the amount of scrap in the mass (less than 4%) practically does not reduce the electrical resistance of the electrodes, and an increase (more than 6%) leads to a decrease in their mechanical strength.

20 A change in the content of the remaining components of the mass either leads to an increase in electrical resistivity or to a decrease in strength with a slight change in electrical resistivity.

25 electrodes.

Primer p. Thermal anthracite with (I) moisture content 0.25, 30 sulfur 1.2, ash content 5.1, and volatile

}, L And electrical resistance 1200 Ohm.mm / mg foundry coke brand CL-2 with moisture content (%) 4.7, sulfur 0.85, ash content 9.2, yield of volatile 1.1, and electrical resistance 350 Ohm. graphitized, waste with a moisture content (%) of 0.2, sulfur 0.15, ash ash 1.1, volatile yield 0.5; coal tar pitch with a moisture content of 2.7%. ash content 0.13, volatile yield, 61.1, density at 1.2 G / cm 2СГС and 1.19 g / cm at 300 ° С ist. size 69.5 ° C.

Before mixing with other components, thermoanthracite is calcined in a reducing medium at 1250i for 45 minutes, and coke and graphitized waste for 30 minutes.

Thermoanthracite in the form of particles with a size of 4-20

mm, coke up to 4 mm, graphitized waste 4 mm, ferro-titanium containing scrap about 4 mm.

After dosing, the mass is thoroughly mixed in a screw mixer for 5 minutes at 40 ° C at 120 ° C, and then burned in cylindrical forms with a diameter of 60 and a height of 250 mm in a coke bed to a temperature of 900 C at a heating rate of 100 ° C / h, followed by cooling backfilling to room temperature within 8-10h. Then, from the obtained baked blanks, samples with a diameter of 50 and a height of 60 mm are cut, the specific 5 electrical resistance is determined by the method of a voltmeter-ammeter and tensile strength according to TU-48-12-9-72.

The composition and properties of the calcined masses are presented in the table.

in h - 1L nl 1L

-l hf about T-l about in g-1 M f N "N N t-1 MS

t-1 fM xN N 1L Ov

VO st

ffi yo yes soo oo oo

"H-h-tM VD

 tM cm (N (M cm (N

T 1L VD iO 1L 1L

P CM tN (N O | CS

YY t WITH OO kO

1 (N (N (N (N MS 04

(Lh

N S "N HCS GO TN

H-tg H-H- "

with

h m p h - 1L VO

S

"N o o

X N

Claims (2)

However, with the use of the invention, it is possible to reduce the electrical resistance of the electrodes by. Claim 1. Carbonaceous mass for saa. myobzhigakhikhsikhs electrodes, including thermoanthracite, coke, graphite waste and coal tar pitch. characterized by the fact that. in order to reduce the resistivity of the electrodes, it additionally contains ferrotitanium containing scrap in the following ratio of ingredients. weight. %: 26-28 Graphite waste 1-315 Ferro-titanium scrap 4-6 Pitch coal. 22-26 Thermoanthracite Ostalnov 48 2. The carbon-containing mass according to claim 1, characterized in that the ferro-titanium-containing scrap contains (wt.%): Titanium 27.5-30 Silicon 5-6 Alk 1iny 3-5 Carbon 10-12 Magnesium 1 -2 Calcium 2-3 Oxygen 1-2 Iron Else Sources of information taken into account during the examination 1. Gasik M, I. et al. Production and operation of continuous self-baking electrodes and anodes, M., Metallurgists, 1965, p. 69-71. 2. MSTU 2616-50. GOST 3340-60, ozept 2 LH (prototype).