A graphite electrode protective agent

Abstract

The invention discloses a graphite electrode protective agent. The protective agent is prepared from the following components in parts by weight: 15-125 parts of silicone resin, 0.3-3 parts of organicmontmorillonite, 2-18 parts of 100% bentonite pre-gel, 1-10 parts of 400 mesh talcum powder, 2-20 parts of mica powder, 7-64 parts of conductive mica powder, 0-10 parts of a mixed solvent, 0.06-0.5 parts of an AC300 defoaming agent, 0.6-5 parts of an HPA202 anti-sag agent and 0.6-5 parts of carbon black. The agent has obvious oxidation resistance, can prevent electrodes from being oxidized at high melting temperature and the electrode end from deforming and can keep continuous arc or few arc breaks, melting efficiency is improved, melting time is shortened, electric energy is saved, the service life of the whole power supply system is effectively prolonged, equipment accidents are reduced, and equipment maintenance intensity is reduced.

Description

technical field [0001] The invention belongs to the technical field of metal smelting, and in particular relates to a graphite electrode protective agent. Background technique [0002] Graphite electrodes used in silicon smelting, steelmaking or other smelting furnaces, the main raw materials include natural graphite, petroleum coke, pitch coke and coal tar pitch, it has good high temperature performance, low thermal expansion coefficient, light weight, strong corrosion resistance and easy processing , excellent thermal shock resistance, but it is usually used in a high-temperature oxidizing atmosphere. The general working temperature is 1200°C-1500°C. The above oxidation increases suddenly, and the oxidation loss accounts for 40% to 60% of the total consumption, and it intensifies as the temperature rises. The higher the temperature, the faster the oxidation rate, and the oxidation loss of the electrode accounts for more than 60% of the total consumption. Due to the high-t...

AI Technical Summary

Problems solved by technology

[0002] Graphite electrodes used in silicon smelting, steelmaking or other smelting furnaces, the main raw materials include natural graphite, petroleum coke, pitch coke and coal tar pitch, it has good high temperature performance, low thermal expansion coefficient, light weight, strong corrosion resistance and easy processing , excellent thermal shock resistance, but it is usually used in a high-temperature oxidizing atmosphere. The general working temperature is 1200°C-1500°C. The above oxidation increases suddenly, and the oxidation loss accounts for 40% to 60% of the total consumption, and it intensifies as the temperature rises. The higher the temperature, the faster the oxidation speed, and the oxidation loss of the electrode accounts for more than 60% of the total consumption.

Due to the high-temperature oxidizing atmosphere, the graphite motor is prone to serious oxidation, so it gradually becomes thinner from the oxidized part, and even fractures appear in the connecting part, which reduces the wear resistance of the electrode; in addition, due to the skin effect of the current , the thinner electrode, the current density increases, and the electrode's ability to withstand large current impacts also decreases, which leads to an increase in the unit consumption of the graphite electrode

[0003] At present, the Chinese patent CN92110580.0 uses refractory materials and organic binders to make primer and surface coatings. Although it can protect graphite electrodes to a certain extent, the coefficient of thermal expansion of coatings and graphite electrodes in the heating process of graphite electrodes has not been solved. The problem of large differences often leads to partial peeling or peeling during the process of rising to high temperature, which directly affects the use effect, and the organic adhesive used leads to the highly volatile decomposition of the coating during use, resulting in too many pores in the coating. Does not form an effective continuous coating, weakening the protective effect