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Carbon brushes are critical to the operation of the paper machine with direct current (dc) motors.Worn or failed brushes cost thousands of dollars per hour.Proper application of carbon brushes, for varying conditions, will provide optimal brush life and minimal commutator wear electrographitic and graphite(resin-bonded) are the two carbon brush families used extensively. Electrographitic brushes are made from lampblack or carbon black with pitch and tar binders. The carbon material may be kiln fired twice at 1100 degrees Centigrade to burn off the volatiles. Then,it is placed in electric induction or resistive furnaces to graphitization and the temperatures is about 2600 to 3000 degrees Centigrade. Electrographitic grades can also impregnated with resins to enhance their brush life and improve friction characteristics.…
Graphite Electrode is mainly usded for steel-making in electric furnace,mineral hot furnace and electric resistance furnace.Graphite electrode conducts electric current into the furnace.Electric current produces arc in the smelting district in the electric furnace,when the temperature increase to about 2000℃,smelting begins.Our a series of graphite electrode is applicable to the common furnace and high power furnace with high pressure and short arc. The graphite electrode must be stored in a clean and dry room. If the graphite electrode is pilled up outdoor, it must be covered with the waterproof cloth and the floors of the pile is prohibited more than 4. In the delivery of graphite electrodes, a waterproof cloth must be covered on the graphite electrodes. When workers are…
We live in this planet, as a graphite producer, Beijing Great Wall should do something. A high-quality flake graphite product that closely resembles natural flake graphite can be made from steelmaking kish. Kish is a large-volume near-molten waste skimmed from the molten iron feed to a basic oxygen furnace, and consists of a mix of graphite (precipitated out of the supersaturated iron), lime-rich slag, and some iron. The iron is recycled on site, leaving a mixture of graphite and slag. The best recovery process uses hydraulic classification (which utilizes a flow of water to separate minerals by specific gravity: graphite is light and settles nearly last) to get a 70% graphite rough concentrate. Leaching this concentrate with hydrochloric acid gives…
