Method for preparing binder-free graphite product

A technology of graphite products and binderless, which is applied in the field of preparation of binderless graphite, can solve the problems of large discharge of asphalt volatiles, and cracked waste products of isostatic pressing products, so as to achieve smooth removal channels and reduce cracked waste products. , good quality effect

Active Publication Date: 2011-05-18
JILIN CARBON
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  • Abstract
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Problems solved by technology

[0002] Compared with graphite electrodes, isostatic graphite products have much smaller particle size composition than electrode products, and the amount of asphalt binder combined with them is much larger than electrode products. If they are roasted together with electrode products, The volatile content of asphalt in isostatic pressed products is relatively large, resulting in roasting cracks in isostatic pressed products.

Method used

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  • Method for preparing binder-free graphite product

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preparation example Construction

[0007] A method for preparing a binder-free graphite product of the present invention is composed of raw petroleum coke with a weight content of 10% to 30% and coal tar pitch mesophase pellet powder with a weight content of 70% to 90%. Dry and dehydrate raw petroleum coke, moisture ≤ 0.5%, drying temperature 130°C, drying time 24 hours; pre-oxidize coal tar pitch mesophase pellets at 120°C, use resistance furnace to freely heat up to 120°C, keep warm 2 hours, naturally cooled to room temperature for later use. Use a crusher to crush the dried and dehydrated raw petroleum coke. The crushed raw petroleum coke is ground into raw petroleum coke powder through a ball mill and an airflow mill in turn. The particle size of the ball mill is controlled at D85~D95≤150μm. The particle size of the machine mill powder is controlled at D85~D95≤60μm, and the raw petroleum coke powder with a weight of 10%~30% and the 70%~90% coal tar pitch mesophase ball powder with a particle size of D85~D95...

Embodiment 1

[0015] Embodiment 1: raw petroleum coke 300kg, coal tar pitch mesophase pellet powder 700kg;

Embodiment 2

[0016] Embodiment 2: raw petroleum coke 200kg, coal tar pitch mesophase pellet powder 800kg;

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Abstract

The invention provides a method for preparing a binder-free graphite product, which is characterized in that the graphite product is composed of crude petroleum coke and coal pitch mesophase pellet powder, and is characterized by comprising the following steps: drying, dewatering and smashing the crude petroleum coke; grinding the smashed crude petroleum coke to obtain crude petroleum coke powder by using a ball mill and an airflow pulverizer in sequence; heating the coal pitch mesophase pellet powder to carry out pre-oxidation treatment; cooling to room temperature; fully mixing by a blender; charging under vibration and preforming; placing blended power into a hydraulic cylinder, and obtaining isostatic pressing graphite green bodies through the steps of boosting pressure, maintaining pressure, reducing pressure and demoulding in an isostatic pressing forming process; placing the isostatic pressing graphite green bodies into an iron crucible; taking river sand and metallurgical coke powder as fillers in the roasting process, wherein the fillers are used for preventing the products from oxidization and deformation and fixing green body shapes; putting the iron crucible filled with the isostatic pressing graphite green bodies into a roasting furnace for roasting treatment to obtain isostatic pressing graphite roasting products after roasting; carrying out graphitization treatment on the isostatic pressing graphite roasting products by using a graphitized furnace to obtain the binder-free graphite products.

Description

technical field [0001] The invention is a preparation method of binder-free graphite. technical background [0002] Compared with graphite electrodes, isostatic graphite products have much smaller particle size composition than electrode products, and the amount of asphalt binder combined with them is much larger than electrode products. If they are roasted together with electrode products, The volatile content of asphalt in isostatic pressed products is relatively large, which leads to roasting cracks in isostatic pressed products. The roasting process of graphite electrode products, the roasting heating cycle is designed according to the requirements of graphite electrodes, the particle size composition of graphite electrodes is characterized by large particle size, for example, the largest particle can reach 20mm, the weight of coal tar pitch used as paste binder Accounting for about 19% to 24% of the weight of the green product, the volatile escape channel of asphalt du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 王成华贾文涛解治友关海涛
Owner JILIN CARBON
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