Graphite anode for heavy current resistant magnesium electrolysis and preparation process thereof

Abstract

The invention relates to a graphite anode for heavy current resistant magnesium electrolysis. The graphite anode is prepared through the following steps of mixing and kneading delay calcined petroleum coke which accounts for 93-99wt% of a dry material, graphite scraps which account for 1-3wt% of the dry material, an additive Fe2O3 and stearic acid, and medium-temperature modified pitch which accounts for 20-30wt% of the total mass, and performing profiling, roasting, steeping and graphitizing, wherein raw materials also include short cut carbon fibers which account for 0.5-5wt% of the dry material. In a graphitizing process adopted during preparation, an insulated filler is adopted between the side surface of an electrode and a furnace body, and an end part filler is adopted in a clearance between the end surface of the electrode and the furnace body, so that the effects of reducing the resistivity, reducing electric arc and reducing pits in the end surface of the electrode.

Description

technical field [0001] The invention relates to a graphite electrode formula and its manufacturing technology. Background technique [0002] In technologies such as the electrolysis of magnesium chloride to prepare magnesium metal, graphite needs to be used as the electrolytic anode. Graphite anode manufacturing technology is mainly divided into five steps: [0003] a. Select raw materials, the main raw materials are petroleum coke, pitch, graphite scrap and stearic acid; b. Carry out raw material crushing, screening, batching, kneading, green body molding; c. Roast and impregnate the green body several times, Make it carbonized and densified; d. Heating it to above 3000°C in a graphitization furnace to convert all the carbon into graphite; e. Use multi-position CNC machine tools for post-processing to become anode electrode materials. [0004] The application number is 2011101258657, a graphite anode for magnesium electrolysis and a preparation method thereof, belonging t...

AI Technical Summary

Problems solved by technology

The heating of the product starts from the surface and then gradually penetrates into the interior. This external heating method causes uneven temperature distribution and thermal stress. Generally, the thermal conductivity of carbon products is relatively poor. When the furnace temperature rises rapidly, it will There may be obvious external heat and internal cooling, resulting in cracked waste products

Images