Preparation method of graphite electrode contact containing graphene
A graphite electrode and graphene technology, which is applied in the field of preparation of graphite electrode joints, can solve the problems of graphite electrodes being broken, broken, and the gap cannot be widened too much, and achieves improved bending resistance, enhanced oxidation resistance, and simple preparation. Effect
Inactive Publication Date: 2018-12-18
DATONG YULINDE CARBON MATERIALS TECH
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Problems solved by technology
Since the connector cannot have the same conductive area as the electrode body, there are higher requirements for the resistivity and bulk density of the connector. At present, the resistivity of graphite electrode connectors after two immersion and three baking is above 3.5μΩ·m. Dense at 1.85g / cm 2 Below, the gap cannot be widened too much, resulting in the graphite electrodes of the steelmaking furnace often breaking at the joint or breaking when passing a large current
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment
[0017] Embodiment: A preparation method of a graphite electrode joint containing graphene is as follows: step 1: crushing and grinding of raw materials, crushing the post coke and needle coke with a secondary crusher and screening out smaller particle materials, and then The materials with smaller particles are continuously ground into fine powder materials through the grinder, and the larger materials screened out are returned to the secondary crusher for crushing until they meet the screening requirements; the ground materials are post-stage coke fines Powdery materials and needle coke fine powdery materials;
[0018] Step 2, batching, the parts by weight prepared in step 1 are 45 parts by weight of post-stage coke fine powder material, 50 parts of needle-shaped coke fine powder material and 4-5 parts of powdery graphene after dry mixing and adding 10 parts Pour one part of water into the kneading pot for wet mixing, knead clockwise for 25 minutes and then add 2 parts of bin...
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Abstract
The invention discloses a preparation method of a graphite electrode contact containing graphene and relates to the technical field of preparation of graphite electrode contacts. The preparation method includes: (1) crushing and grinding raw materials; (2) processing the raw materials; (3) cooling the raw material paste in the step (2), pre-compressing the raw material paste with a precompressor,and manufacturing graphite electrode contact green bodies, in different specifications, by means of a compression molding machine; (4) performing impregnation for two times and roasting for three times to the graphite electrode contact green bodies and cooling the product to obtain the graphite electrode contact containing graphene. By adding the powdery graphene, during a smelting process in a steelmaking electric-arc furnace, the temperature of the contact is uniform and is not excessively high, so that the fracture resistance of the product is greatly improved. In addition, at the high temperature, anti-oxidization effect is enhanced, and the contact can work normally even under overload of current. The preparation method is simple and is easy to promote.
Description
technical field [0001] The invention relates to a method for preparing a graphite electrode joint containing graphene, specifically the technical field of graphite electrode joint preparation. Background technique [0002] At present, the application rate of artificial graphite accounts for 90% of the market. Electrodes and electrode joints made of artificial graphite are important materials for smelting special steel types in electric arc furnaces in steelmaking plants. The main raw materials of artificial graphite electrode joints are calcined coke, needle coke and coal pitch, which are obtained by graphitization after one or more impregnation and roasting. Since the connector cannot have the same conductive area as the electrode body, there are higher requirements for the resistivity and bulk density of the connector. At present, the resistivity of graphite electrode connectors after two immersion and three baking is above 3.5μΩ·m. Dense at 1.85g / cm 2 Below, the gap can...
Claims
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IPC IPC(8): C04B35/532C04B35/83
CPCC04B35/522C04B35/532C04B35/83
Inventor 刘雁伟张惠兵魏玉明
Owner DATONG YULINDE CARBON MATERIALS TECH