Ultrahigh-power graphite electrode contact and preparation process thereof

Abstract

The invention discloses an ultrahigh-power graphite electrode joint and a preparation process thereof, belongs to the technical field of graphite electrode joints, and solves the technical problems oflow breaking strength, insufficient physicochemical indexes, low superior product rate and the like of the conventional ultrahigh-power graphite electrode joint. According to the technical scheme, the ultrahigh-power graphite electrode contact is prepared from the following raw materials in parts by weight: 45 parts of needle coke, 55 parts of calcined coke powder, 25 parts of asphalt binder and0.5 part of a Fe2O3 additive, wherein methylbenzaldehyde and p-toluenesulfonic acid are added into the asphalt binder. The process comprises the following steps: 1, burdening; 2, mixing and kneading to prepare paste; 3, performing extrusion molding; 4, performing primary roasting; 5, performing primary dipping; 6, performing secondary roasting; 7, carrying out secondary impregnation; 8, roasting for the third time; 9, performing graphitization treatment; and 10, machining. According to the invention, the volume density and breaking strength are improved, various physicochemical indexes are superior to those of the original product, and the production cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of graphite electrode joints, and in particular relates to an ultra-high-power graphite electrode joint and a preparation process thereof. Background technique [0002] In the use of ultra-high power graphite electrodes in electric arc furnaces, the annual consumption due to electrode breakage accounts for more than 10% of the total consumption, which is mainly due to the low flexural strength of ultra-high power graphite electrode joints and insufficient physical and chemical indicators. In the actual production process, the quality of graphite electrode joints is directly related to the use of electrode joints in electric arc furnaces. [0003] Due to the relatively high requirements for the flexural strength, bulk density, electrical resistance and other indicators of graphite electrode joints, the current production still uses full needle coke and three immersion and four baking before it can enter graph...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art, provide a kind of ultra-high power graphite electrode joint and its preparation process, solve the existing ultra-high power graphite electrode joint low flexural strength, insufficient physical and chemical indicators and excellent product rate non-technical issues