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Needle coke, its preparation method and its preparation device

A technology of needle coke and green coke, which is applied in coke ovens, special forms of dry distillation, petroleum industry, etc. It can solve the problems of unqualified particle size distribution of needle coke products, improve utilization, increase yield, and improve economic benefits Effect

Active Publication Date: 2021-11-26
BEIJING RISUN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a high-quality needle coke production method, by controlling the particle distribution of raw coke, especially the content control and adjustment of fine powder, while improving the quality of needle coke, rational use of fine particles It solves the problem of unqualified particle size distribution of needle coke products in production enterprises. The important feature of this method is stable quality, so that it will not cause quality changes in electrode products when manufacturing artificial graphite electrodes.

Method used

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  • Needle coke, its preparation method and its preparation device
  • Needle coke, its preparation method and its preparation device
  • Needle coke, its preparation method and its preparation device

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preparation example Construction

[0043] Hereinafter, the method for preparing needle coke of the present invention is described in detail, so that those skilled in the art can better understand the present invention, but these specific descriptions are not intended to limit the scope of the present invention.

[0044] First, the green coke material that has been primary crushed and screened (the raw coke is conventional raw coke that has undergone delayed coking in this field) is transported to the subdividing equipment through the transmission belt 101, and first enters the vibrating screen shell through the discharge chute 102 After 103, through the first layer of vibrating screen 104, the sieve opening of 104 is designed to have a diameter of 8mm, and the particles on the top of the screen pass through the coarse particle discharge chute 118 and the transmission belt 11a and then pass through the coarse particle lifting device 106 and enter the coarse particle lower hopper 109 . The fine particles under th...

Embodiment 1

[0060] Firstly, raw coke materials that have been preliminarily crushed and screened are transported to the vibrating screen equipment through the transmission belt 101, first enter the vibrating screen shell 103 through the discharge chute 102, and then pass through the first layer of vibrating screen 104. The screen holes of 104 are designed to have a diameter of 8mm, the particles on the upper part of the sieve pass through the coarse particle discharge chute 118 and the transmission belt 11a and then pass through the coarse particle lifting device 106 and enter the coarse particle lower bin 109. The fine particles under the 104 screen pass through the second layer of vibrating screens 105, 105 The sieve aperture is 1mm, and the fine particle coke on the top of the 105 sieve passes through the fine particle discharge chute 119, the transmission belt 11b, and then enters the fine particle lower hopper 110 through the fine particle lifting device 107, and the powder at the bott...

Embodiment 2

[0065] Through online particle detector 116 analysis and adjustment control coarse particle feeder 112, fine particle quantitative feeder 113, powder quantitative feeder 114, make the powder 21wt% at conveying belt 115 places, fine particle 40wt%, coarse particle 39wt% , the physical data of raw coke is water content of 6% (weight), volatile matter of 5%, true density of 1.623g / cm 3 (the same raw coke as embodiment 1). Calcination adopts three-stage calcination, and its operating parameters are shown in Table 1 below.

[0066] The true density of needle coke after cooling is 1.507g / cm 3 , the compressive strength of the particles is 26% (2-4mm), the particle distribution is 15wt% below 1mm, 39wt% 1-8mm, 46wt% above 8mm, needle coke yield (needle coke output / green coke input The amount of material) is 86%, the volatile matter is 0.10%, and the coefficient of thermal expansion (room temperature-600°C) is 0.72×10 -6 / °C.

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Abstract

The invention provides a needle coke, its preparation method and its preparation device. The preparation method of needle coke of the present invention comprises the following steps: after the delayed coking green coke is divided into powder, fine particles and coarse particles, and then 18-25 parts by weight of powder, 30-50 parts by weight of fine particles, 40 parts by weight of coarse particles -50 parts by weight are mixed to obtain mixed green coke; and the mixed green coke is transported to a calcination device for stage-by-stage calcination treatment. The present invention can reduce the thermal expansion coefficient of the produced needle coke by controlling the weight ratio of the particle size of the green coke to be calcined and by setting three-stage calcination including pre-calcination, cooling and calcination, and can control the thermal expansion coefficient of the produced needle coke at the same time. The particle size distribution, therefore, compared with the existing needle coke, it is more suitable for the production of artificial graphite electrodes.

Description

technical field [0001] The invention belongs to the technical field of chemical raw material preparation, and in particular relates to a needle coke, its preparation method and its preparation device. Background technique [0002] The production of needle coke is usually completed by three processes, namely raw material pretreatment, delayed coking and calcination. The needle coke produced by delayed coking is customarily called green coke, and the needle coke calcined in a rotary kiln or tank kiln is called calcined coke. The calcination operation is usually carried out at a temperature of 1200 to 1500°C. Through calcination, the moisture and volatiles in the green coke can be removed, and at the same time, the thermal condensation reaction in the delayed coke is fully completed and the crystal structure in the needle coke is further improved, showing the calcination The density and mechanical strength of the back coke are improved, and the electrical conductivity and oxid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B53/00C10B57/00
CPCC10B53/00C10B57/00
Inventor 庞伟伟刘哲党伟荣陈西波
Owner BEIJING RISUN TECH CO LTD
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