Preparation method for moulding fine structure graphite anode

Abstract

The invention discloses a method for preparing a moulding fine-texture graphite anode. The main technological process is as follows: high-quality calcined petroleum coke is selected; the compositionsof superfine abrasive dust and small particles are adopted; after dry mixing of graphite scraps and the calcined petroleum coke, high-quality medium coal tar pitch is added; under certain temperatureand pressure, cold compression moulding forming is performed in a special die by utilization of a double-sided press machine after kneading, flaking and secondary milling; roasting is then performed and a manufactured product is guaranteed to have no crack; the density of the product is improved through dipping treatment of the coal tar pitch and then a finished product is obtained through reduction of the specific resistance and purification treatment during the graphitizing process. The graphite anode produced by the preparation method has high density, low specific resistance, low anisotropism ratio, a compact and uniform internal structure, low porosity and low ash content, and has certain mechanical strength and thermal shock resistance.

Description

technical field [0001] The invention relates to a preparation method of a graphite anode, in particular to a preparation method of a graphite anode used in a rare earth metal electrolytic furnace. Background technique [0002] Graphite anodes for rare earth smelting are new tool materials in the non-metallic field, and are mainly used as anodes in electrolytic furnaces for electrolyzing rare earth metals. The rare earth metal electrolysis furnace is made of a graphite crucible with an iron sleeve. The rare earth metal oxide is placed in the crucible, and a tungsten rod is inserted into it to be energized as a cathode. The four walls of the crucible are hung with arc-shaped graphite surrounded by four quarter cylinders. The product is used as an anode to conduct electricity and reduce it. It makes the oxygen atoms in the rare earth metal oxide react with the carbon atoms in the graphite anode to replace the rare earth metal element or alloy. Therefore, graphite anodes for sm...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a preparation method of molded fine-structured graphite anode. This preparation method designs the mold according to the furnace type of the smelting rare earth electrolytic furnace and the consumption characteristics of the anode oxidation, so that one end of the product inlaid suspension device does not affect the internal Appropriate thickening under the condition of structure, using ultra-fine powder, fine particle formula, double-sided compression molding method to form and impregnate once, and then through graphitization and purification process, so that the product can achieve high purity, high density, fine structure, The goal of low specific resistance and low consumption

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