ACHESON FURNACE PDF

We'd like to understand how you use our websites in order to improve them. Register your interest. The Acheson process is used to manufacture silicon carbide SiC in a resistor furnace using petroleum coke and silica as raw materials. The process is highly inefficient, as only 10 to 15 pct of the charge gets converted into silicon carbide. No published attempt has been made to optimize this century-old process by applying mathematical modeling.

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We'd like to understand how you use our websites in order to improve them. Register your interest. The Acheson process is used to manufacture silicon carbide SiC in a resistor furnace using petroleum coke and silica as raw materials.

The process is highly inefficient, as only 10 to 15 pct of the charge gets converted into silicon carbide. No published attempt has been made to optimize this century-old process by applying mathematical modeling. Therefore, a simultaneous heat- and mass-transfer model has been developed for the resistance-heating furnace, considering silicon carbide formation as a typical carbothermal reaction.

Coupled transient partial differential equations have been worked out. These equations have been solved numerically, using the implicit finite-difference method in their nondimensional form, to obtain the profiles of solid temperature and volume fraction reacted in the furnace. The effects of various parameters on the process have been studied.

These include void fraction, power inputs, initial concentration of silicon carbide present in the charge, etc. This is a preview of subscription content, log in to check access. Majorowski and P. Google Scholar. Nagamori, R. Leblano, and R. Courtemanche: Proc. Tucker and Alexander Lampen: J. Horace W. Gillett: J. Vasanth Kumar and G. Gupta: Conf. Gordon R. Finlay: Chem. Canada , , Feb. Klinger, E. Strauss, and K. Komarek: J.

Metselaar: J. Kjell Wilk and Ketil Motzfeldt: Mater. Wiik: Ph. Thesis, University of Trondheim, Trondheim, Norway, Holman: Heat Transfer , 8th ed. Raymond R. Ridgway: Trans. Perry, D. Green, and J. Maloney: Chemical Engineering Handbook , 7th ed. Fine and G. Kaya and T. Laby: Tables of Physical and Chemical Constants , 14th ed. Bolz and G. Download references.

Reprints and Permissions. Gupta, G. Heat-transfer model for the acheson process. Metall and Mat Trans A 32, — Download citation. Received : 24 August Issue Date : June Search SpringerLink Search. Abstract The Acheson process is used to manufacture silicon carbide SiC in a resistor furnace using petroleum coke and silica as raw materials. References 1. Gupta Authors G. Gupta View author publications. You can also search for this author in PubMed Google Scholar. View author publications.

Rights and permissions Reprints and Permissions. About this article Cite this article Gupta, G.

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Acheson process

Lengthwise graphitisation longitudinal array was first described by Castner, and is characterised by the direct connection of the stock one to another in a row without a resistor material in between. The artifacts are clamped between the head electrodes of the furnace and heated by passing the current directly through the load. The contact area of the material to be graphitised has to fit well and therefore requires plane-parallel machining and an adjustable clamping device in order to secure a constant, tight electrical contact for a low-contact resistance. The insulation against oxidation and high heat loosses is the same as for Acheson furnaces. This graphitising method has the advantage of shorter heating periods, less power consumption and smaller furnace dimensions. Inductively heated furnaces are normally used for parts, which need to be graphitised with a very well controlled temperature profile. Indirectly heated furnaces consist of a horizontal or vertical graphite tube of rectangular or cylindrical cross-section.

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Heat-transfer model for the acheson process

The invention belongs to negative material preparing technical field, be specifically related to a kind of graphitization technique producing negative material acheson furnace. Lithium ion battery is the representative of contemporary heavy-duty battery, is a kind of New Green Energy product-derived, is widely used in information, telecommunication and power industry. With the development of international productivity, the quick consumption of petroleum resources, the environmental problem caused by pollution that city great amount of fuel oil vehicle exhaust produces becomes increasingly conspicuous, and for really solving the tail gas pollution of automobile, the cry of development zero release electric vehicle is more and more higher. The key of electric vehicle performance is battery, and lithium ion battery is the ideal source of power truck. The raising of lithium ion battery negative material to performance of lithium ion battery plays vital effect. Current commodity lithium ion battery extensively adopts carbon negative pole material. Wherein, graphite negative electrodes material is with its wide material sources, and stable performance, several large advantage such as energy-conserving and environment-protective becomes the main Types of carbon negative pole material.

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Acheson Process

The process consists of heating a mixture of silicon dioxide SiO 2 , in the form of silica or quartz sand, [1] and carbon , in its elemental form as powdered coke , in an iron bowl. In the furnace, the silicon dioxide, which sometimes also contains other additives, is melted surrounding a graphite rod, which serves as a core. There are four chemical reactions in the production of silicon carbide: [3]. This overall process is highly endothermic , with a net reaction of: [1]. In Acheson attempted to synthesize diamond but ended up creating blue crystals of silicon carbide that he called carborundum. He also discovered that when starting with carbon instead of silicon carbide, graphite was produced only when there was an impurity, such as silica, that would result in first producing a carbide. He patented the process of making graphite in

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