SU1168287A1 - Method of preparing coke for making artificial graphite based on coke-sintered composition - Google Patents

Abstract

A METHOD FOR PREPARING A COKE FOR THE MANUFACTURE OF ARTIFICIAL GRAPHITE BASED ON A COKE-BAKE COMPOSITION, which consists in its crushing and grinding with the successive sifting of the required fractions, in order to improve the performance of the flow of the components. crushed coke, crushing of coke is carried out to obtain a fraction of 5.0-2.3 mm, the subsequent grinding is achieved in -7-10 consecutive stages with a degree of grinding in each 1.05-1.25, and each section of the fraction is additionally successively scattered into two parts 1-3 times with a ratio of 1: 1-3, grinding | Some super-sieve product of each section is mixed and the sub-product is mixed with the undersize product previous sieving.

Description

The invention relates to methods for producing artificial graphite, and specifically to methods for grinding coke for the manufacture of artificial graphite based on a coke-pitch composition. The purpose of the invention is to increase the grinding capacity and reduce energy costs, as well as to improve the accuracy of the required grain composition of ground coke. FIG. 1 shows the scheme of the proposed method; in fig. 2 is a block diagram of the process of crushing, grinding and sieving using the method for grinding coke to obtain a mixture reproducing the composition of a mixture of one of artificial graphite, obtained using electrode technology in FIG. 3 - three coke fractions obtained in the factory and laboratory conditions (at different scales). The implementation scheme of the proposed method includes the following operations: crushing 1 of the original coke to a fraction of 5.0-2.3 mm, sieving 2 the obtained product into the desired fractions, controlled. (required) fraction 3, i-4 (in this case, the second) from controlled fractions; controlled fractions 5 and 6; sieving 7 i-th fraction into two (on a sieve with the same cell size, which gives a ratio of 1: 1-3 grains, I upper fraction 8 obtained by sieving 7 from the i-th fraction lower fraction 9 obtained by sieving 7 from the i-th fraction, analysis 10 of the upper fraction 8, sieving 11 fractions 8 into two fractions, similarly to sieving 7, upper fraction 12 from the obtained 11 sowing fractions, lower n fraction 13 from the obtained sieving 11 fractions, grinding 14 top fraction 12, sampling 15 samples from the fraction obtained grinding 14, and fraction 13, the dosing of 16 samples of the fractions obtained by sampling 15, in the amount tvah, proportional to the weights of the fractions, mixing 17 samples obtained by dosing 16, analyzing 18 of these mixed, mixing 19 fractions obtained by grinding 14, and fraction 13, sieving 20 lower of the obtained 7 sieving fractions into two, the upper fraction 21 of the 20 fractions obtained, fraction 22 of the 20 fractions obtained by sieving, sampling of 23 samples from the upper fraction obtained by sieving 7, and from the upper fraction 21 is proportional to the weights of the fractions, withdrawal 24 of the lower F1) 22 (undersize product) and mixing it with the following controlled fraction 5, dosage 25 samples of the fractions obtained by sampling 23, in quantities proportional to the weights, mixing 26 samples of the dosage obtained 25, analysis 27 of these mixed, mixing 28 fractions 8 and 21, dosing and mixing 29 all modified in the same way as fraction 4, control fractions 3-6. Fig. 3 shows the distribution curves for particles 30, 32 and 34, respectively, of fractions 3, 4 and 5 by size for factory grinding and curves 31, 33 and 35 for grinding in laboratory conditions. The method is carried out as follows. The crushing of 1 initial coke is carried out to obtain a fraction of 5.0-2.3 mm, and then it is sieved 2 into required (controlled) FR & 3-6 (fractions can be larger or smaller depending on the process), of which in accordance with the technical process, by blending 29, the desired mixture of a given composition for the production of artificial graphite based on a coke-pitch composition is obtained. Each fraction in series, starting with fraction 3 and ending with fraction 6, is subjected to the following procedure (Fig. 1 shows the intermediate case pro; keeping this procedure for fraction 4). Fraction 3 is subjected to sieving 7 into fractions 8 and 9. Next, fractions 8 and 9 are subjected to analysis 10 and, if either of them does not correspond to the fraction of the average diameter specified for the grain composition, then in the case of over-aggregation fraction 4, the upper fraction 8 is subjected to sieving 1 1 two fractions 12 and 13, the top 12 of which (the oversize product) are subjected to grinding 14 with a grinding degree of 1.05-1.25, 15 samples are taken from fractions after grinding 14, fractions 13 and 9, and they are dispensed 16 in quantities proportional to the weights of the fractions, mixing is carried out one product (fraction 9) with the undersize product of the previous sieving 11 (fraction 1 and analysis 18, comparing the product obtained with the factory-obtained fraction by the average diameter and shape of the distribution curve. According to the results of the analysis, if the differences are statically significant, they return At the beginning of the procedure for fraction 8, taking the obtained sieving fraction 12 as fraction 8, the indicated grinding and sieving operations are repeated, if the discrepancies are statically insignificant, then 19 of all the obtained fractions are mixed. In the case of an oversized controlled fraction 4 after sowing 7 and after receiving the fraction 9, it is sieved, into fractions 21 and 22, nor; with button 22 from which: ryh, fraction 4 is excluded from the processing and mixed with the next fraction 5 of smaller size (p It is carried out by sampling product 2), from the upper fraction 21 (, oversize product) and from fraction 8, 23 are sampled to dispense 25 of these samples in quantities proportional to the weights of the fractions, 26 is oversized product (fraction 21) with the undersize product of the previous screening 2 and analysis 27. If the result analysis is unsatisfactory (in the sense of statistical significance), then return to the beginning of the process: for fraction 9, taking fraction 21 as fraction 9, and if the results of the analysis are satisfactory, 28 these fractions are mixed. These grinding and sieving procedures are carried out 7 -10 times alternately, sequentially or separately with each of the controlled fractions 3-6, after which they are mixed 29 to obtain the desired mixture, Example 1. In laboratory conditions, the coke is ground to obtain a coke batch with gr The composition reproducing the granulation of the mixture for the production of coarse-grained graphite consisting of three fractions: fraction 3 with a particle size of 0.5-1.2 mm, fraction 4 with a particle size of 0.2-0.5 mm and fraction 5 with a particle size of 0.05 -0.15 mm mixed in a ratio of 1: 0.7: 1.5. For crushing, a laboratory jaw crusher is used, for grinding - a laboratory disk disintegrator with an adjustable distance between the disks and a laboratory ball mill, for sieving - a laboratory screen with interchangeable sith Select canopy-. The calcined petroleum electrode coke weighing 12 kg and is crushed 1 to obtain a fraction of 5–0-2.3 mm. After sieving, 2 fraction 3 is over-aggregated (87 compared to the required, 68), fraction 4 is oversized 0.18 - / compared with d 0.24), fraction 5 is oversized (dg-0.11 instead ., 072). Fraction 3 is subjected to sieving 7 on a sieve of 0.85 (with a ratio of 1: 1) to obtain fraction 9 0.5-0.85 mm and weight 1.8 kg and fraction 8 0.85-1.2 mm weighing 0.9 kg Fraction 8 is analyzed 10 and measured 14 on a disintegrator with a degree of grounding of 1.15-1.4 m, 15 samples are taken and their dosing is 16 and mixing 17 in a ratio of 1; 2 (335.3 g of fraction 8 and 66.7 g of fraction 9), obtaining a sample weighing 100 g for sieve analysis 5 and conducting a sieve analysis 18 on a laboratory shaker and a standard set of sieves (using sieves with the following cell sizes: 2.5; 1.6j 1.0; 0, 63; 0.40 | 0.315; 0.200; 0.160; 0.10; 0.063; 0.050). From the results of the whitefish analysis, 18 calculate d ;; 0.72 mm, the significance of the discrepancy is checked first by the calculation of the Fisher criterion F 1.985, which is less than the critical value of 2.34 at c – 0.95, and then by the criterion. Stewdept for distinguishing between two means, which is also fulfilled, and comparing the size distribution curves using the Kolmogorov criterion, which also shows a non-discrepancy. Fraction 8 passes mixing 19, is fed for dosing and seduction 29. Fraction 4 passes sowing 20, upper fraction 21 passes sieve analysis 27, the result of which gives d 0.25 mm and insignificance of discrepancies by all criteria, after what is transferred to the modifier fraction 4 for dosing and mixing 29. Fraction 5 is subjected to grinding 14 on a disintegrator in seven stages with a grinding degree of 1.25, respectively — 1.15; 1.05; 1.05; 1.05;

1.05; 1.05, and then in a ball mill for 23 hours, 23 samples were taken, they were dispensed 25, mixed 26 and analyzed 27, which resulted in (0.081 mm and insignificance of differences according to all criteria, after which the fractions are mixed 28 and transferred to dosing and mixing 29. The preparation of the charge of the specified composition was completed,

PRI mme R 2. All other things being equal, grinding of calcined shale electrode coke is carried out in an amount of 12 kg. After sieving 2, fraction 3 is normal in size (d mm), fraction 4 is recrystallized (d 0.36 compared to d 0.24), fraction 5 normal in size (d5.0.073 with dy O, 072) o Fraction 4 is subjected to sieving into two fractions with a ratio of 1: 3 fineness (sieve 0.4). The oversize product is successively crushed on an eraser disintegrator, 10 times with a 1.25 degree of crushing, screened out on a 054 sieve, each split fraction dissipated into two parts 3 times on a 1.0 sieve, the oversized product is crushed in 10 stages , and the oversized product is mixed with the undersize product of the previous sieving.

The table shows the comparative characteristics of the proposed and known methods.

Dividing each controlled fraction into two allows one to avoid the possible excessive crushing or grinding of small parts of this fraction or to avoid (in the case of oversized fraction) the particles belonging to the upper boundary of the next fraction when moving down by fraction. Thus, the processing of coke proceeds from large fractions to small fractions, all the time work is carried out with large parts of each fraction and only in the case of overgrinding, sifting from the lower part of the fraction is necessary. Mixing the samples taken from the fractions in proportion to their weights makes it possible to reliably judge what the mixtures of these fractions will be. Alternating, sequential or separate implementation of these operations allows in each case to operate with each fraction depending on its composition and its coincidence with the specified one.

0.129

0.025 0.015

2.0

9.4

0.04

0.03

0.022

0,018 0,09 0,009

ten

1.64

1.69

2.2

3.5

3.3

5.8

The application of the invention allows to increase the accuracy of selection of a given granulation by 8-12% due to the sequential division of each phase into two fractions, which at the end of the process makes it possible to maculate at the end of the process with very narrow fractions, to increase the productivity of the process of obtaining the mixture by 7- 10% due to the exclusion of grinding of fine fractions, together with large ones, to reduce

coke losses of 10–12% due to the elimination of the possibility of overgrinding of fractions, which causes an additional consumption of coke to obtain the required weight of coarse fractions, as well as reduce the energy costs of grinding by an average of 8–10% due to the preferential grinding of coarse fractions, which comes with costs due to splitting shredding instead of abrasive.

Cpuz.1

FIG. g

J. 35 30 zg 33 3i

Claims (1)

COKE PREPARATION METHOD FOR MANUFACTURING SYNTHETIC GRAPHITE BASED COMPOSITIONS coke-pitch, comprising in its crushing and grinding the ⁴ iz consistent with the desired fractions vom screened out, characterized in that, in order to improve grinding performance and reduce energy costs as well as improve the accuracy of preparation the required r'-composition of crushed coke, crushing of coke is carried out to obtain a fraction of 5.0-2.3 mm, subsequent grinding is carried out in -7-10 successive stages with a degree of grinding in each 1 , 05-1.25, and each sifted fraction is additionally sequentially scattered into two parts 1-3 times with a particle size ratio of 1: 1-3, the sieve product of each sieving is crushed, and the sieve product is mixed with the sieve product of the previous sieving. 1168297