Method for manufacturing high-density artificial graphite electrode
A technology of artificial graphite and manufacturing methods, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as cracks and large temperature differences
Pending Publication Date: 2021-11-16
NIPPON STEEL CHEM &MATERIAL CO LTD
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Problems solved by technology
If the size of the artificial graphite electrode increases, the temperature difference in the radial direction during the use of the electrode will increase, so cracks due to thermal shock will easily occur
Method used
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Embodiment 1～7
[0048] As the needle coke, a coal-based needle coke having a true density of 2.15 and a pore volume of 0.136 cc / g measured with a mercury porosimeter was used.
[0049] The needle coke is pulverized with a jaw crusher, sieved with 8-16 mesh (Me') (2.38-1.0mm), mixed on the sieve and under the sieve, pulverized with a hammer crusher, and sieved It is 48-200Me' (325-74μm) and below 200Me' (below 74μm).
[0050] Among these particle sizes, powders with a particle size of 200 Me' or less were subjected to a shape change treatment using a high-speed stirring type powderization device manufactured by Seishin Corporation. The shape treatment was carried out under four conditions with the same blending ratio of coke (Examples 1, 3, 4, and 5). Furthermore, in Example 2 and Examples 6 and 7, the coke with the same particle diameter which was not subjected to the shape modification treatment was blended, and the effect of the shape modification treatment was compared.
[0051] The degr...
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Abstract
Provided is a method for manufacturing a high-density artificial graphite electrode without substantially changing the particle size or proportion of needle coke to be used, increasing the amount of binder pitch, or extrusion molding with a high molding pressure. The method for manufacturing an artificial graphite electrode includes the steps of kneading binder pitch into needle coke, extrusion molding the same, and then firing and graphitizing the same, wherein at least a portion of the ground needle coke to be used is subjected to a coke-shape alteration process such that the ratio of envelope peripheral length / peripheral length is 1% or more greater than the value prior to the alteration. The envelope peripheral length is the length of a perimeter of the tops of projections of the ground needle coke connected by the shortest distances therebetween, and the peripheral length is the length of a perimeter of a particle.
Description
technical field [0001] The present invention relates to a method for manufacturing a high-density artificial graphite electrode, in particular to a method for manufacturing a high-density electrode for electric steelmaking used when electric steelmaking is used to manufacture electric furnace steel. Background technique [0002] Artificial graphite electrodes use coal-based or petroleum-based needle coke as aggregate, and use binder pitch as a binding material to fix the aggregate, and are widely used as electrodes for electrical steelmaking. Such an artificial graphite electrode is generally produced by sieving and further pulverizing needle coke to a predetermined particle size, kneading with binder pitch, extruding, and then performing calcination and graphitization. [0003] In recent years, with the popularization of large-scale high-load electric furnaces, artificial graphite electrodes with a diameter of 24 to 32 inches are becoming mainstream in DC electric furnaces ...
Claims
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IPC IPC(8): C04B35/532C01B32/205
CPCC04B35/532C01B32/205C04B35/522C04B35/6261C04B35/62695C04B2235/5436C04B2235/6021C04B2235/77C04B2235/608C04B2235/9607C04B2235/726C04B2235/722Y02P10/20C01P2006/40
Inventor 川野阳一
Owner NIPPON STEEL CHEM &MATERIAL CO LTD