SU1350110A1 - Method of stowing electrode cylindrical workpieces in graphitizing furnace - Google Patents

Abstract

The invention relates to methods for laying electrode blanks in a graphitization furnace and can be used in the electrode industry. The purpose of the invention is to increase the yield and reduce the electricity for graphitization. For this purpose, electrode cylindrical billets of different diameters are placed in a furnace of graphite with horizontal rows perpendicular to the longitudinal axis of the furnace. The gaps between the blanks are filled with carbon-containing charge. In the central zone, blanks of smaller diameter are placed from a pair of homologous diameters of blanks according to the temperature dependence of the electrical resistivity of gra (blanks in the peripheral zone are placed blanks of larger diameter from the same pair of homologous row. In the process of heating, the properties of different diameters of electrical resistance are equalized, which will lead to an increase in the yield of electricity and a decrease in electricity for graphitization. 2 ill., 1 tab. (L 00 SP

Description

one

The invention relates to methods for laying electrode blanks in a graphitization furnace and can be used in the electrode industry.

The purpose of the invention is to increase the yield and reduce the electric energy of rotting to graphitization.

Figure 1 presents the layout of the blanks on the cross-section of the core of the furnace graphitization; Fig. 2 shows the dependence of the electrical resistivity of electrode graphitized blanks on the graphitization temperature;

In a graphitization furnace, heat-treating preforms of homologous series, the diameter of which may be, respectively, mm: 75, 100, 125, 150, 200, 225, 250, 300, 350, 400, 450, 500, 555, 710.

The quality of the graphite electrode blanks is determined by their electrical resistivity. The lower the electrical resistivity, the higher the yield of the highest grade

From the dependence of the resistivity of graphitized blanks shown in Fig. 2, it follows that the higher the graphitization temperature, the lower the electrical resistivity of the electrode billet In the central core zone, the temperature is 300-500 ° C higher than the temperature of the peripheral zone, i.e. temperature field is uneven.

Therefore, to increase the yield of the highest grade of graphitized electrode products, billet of smaller diameter from a pair of homologous diameters of electrode blanks, depending on their electrical resistivity on the required temperature of graphitization, is placed into the central high-temperature core zone of the furnace, and larger billet is loaded into the peripheral core zone diameter of the same pair of homologous p yes

Such pairs can be, for example, blanks with a diameter of 75 mm, loaded into the central zone, and into the peripheral zone - any larger diameter - from this homologous series: 100, 125 ... 710,

If in the central zone of the core load blanks 400 400 mm, then in the peripheral zone - any of the large diameters: 0 450, 500, 555, 710 mm

350110

The core of the furnace consists of a heat insulating charge mixture 1 surrounded by soils and placed with horizontal p dat sh perpendicular to the longitudinal axis of the furnace billet 2 and 3 of different diameters, respectively, larger and smaller diameters of a homologous series of diameters with carbon-containing filling, for example, coke fraction 15- 25 mm.

Example

On under gra ovens

five

0

five

0

five

0

0

Fitted with a layer of heat insulating charge 1 with a thickness of 700x50 t-rMf, side shields are installed (not shown), several rows of billets 2 are used with a diameter of 300 mm, space is filled with billets, backfilling 4, the distance between the billet Kaiffi is maintained equal to 60 mm (0.2 diameter), then lay the workpiece 3 of a smaller cross section with a diameter of 150 mm. Pouches of blanks 3 are poured with filling 4, then the top rows of blanks with a diameter of 300 mm are placed at a distance of 60 mm from each other, and the space between them is filled with filling 4, the space between the side walls of the furnace and shields are instilled with heat-insulating charge ( sprinkle a layer of heat insulating charge) height of 600-800 MJ4o

Thus, from this pair of homologous series, blanks of a smaller diameter are placed in the central high-temperature zone of the graphitization core, and blanks of a larger diameter are placed in the peripheral zone. Then, electric power is supplied to the furnace

Example 2: The furnace load is similar to that described in the example; the diameter of the blanks E in the central zone is. 100 mm, in the peripheral zone 300 MivJo

The table presents the output data B1: of the best grade of graphitized blanks according to the proposed and known methods

Pre, the proposed method of laying electrode, cylindrical blanks in a graphitization furnace makes it possible to significantly increase the yield of suitable blanks and, consequently, reduce the costs of electric power for graphitization.

55

Formula

about b e ni

Method of laying electrode cylindrical billets 3 furnaces graphitatdii

by placing billets of various diameters in horizontal rows perpendicular to the longitudinal axis of the furnace and filling gaps between them with carbon-containing backfilling, about tl and hp and so 4TOj in order to increase the yield of electricity and reduce electricity for graphitization, in central

A zone of smaller diameter billets from a homologous pair of diameters of blanks is placed according to the temperature dependence of the electrical resistivity of graphitized billets, and larger diameter blanks from the same pair of homologous rows are placed in the peripheral zone.

nyam

40

20

WOO

2000 FIG. 2

Editor NoLazarenko

Compiled by Prkova Tehred A. Kravchuk

Order 5224/21

Techred 456Subscription

VNIIGI State Committee of the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., Do4 / 5

Production and printing company, GoUzhgorod, ul, Proektna, 4

3000

Proof-reader I.Erdeyi

Claims (1)

Claim A method of laying electrode cylindrical billets from a graphitization furnace by placing billets of various diameters in horizontal rows perpendicular to the longitudinal axis of the furnace and filling the gaps between them with a carbon-containing backfill, with the exception that in order to increase the yield and reduce electricity for graphitization, in the central zone place blanks of smaller diameter from a pair of a homologous series of diameters of blanks according to the temperature dependence of the electrical resistivity of graphitized zag tovok and arranged in the peripheral zone of the blank of larger diameter of the same pair of the homologous series. At- Diameter Grade Increase measures prepared vy wok Sun 1C high mm his varieties,% 1 300 66.3 33.7 2,4 150 73.3 26.7 24.5 2 300 70.1 29.9 . 2,4 100 42.6 57.4 30.6 3 (of 300 63.9 36.1 - nice) 150 48.8 51,2 - 100 12.0 88 9 G. · ♦ · · ·! . . · · * * *. ·· * ·· Z L-L * * 9 -JcJw ² (w \ p7) FV (♦ '% # · Figure 2