Nanometer metal ceramic inertia anode material for electrolytic aluminum and preparation method thereof

A nano-cermet and inert anode technology, applied in the field of electrochemical electrolysis, can solve the problems of increasing electrical conductivity, cracks in the electrode body, difficulty in processing and large-scale, etc., to achieve improved processing performance, high bending strength and fracture toughness Effect

Inactive Publication Date: 2011-11-02
GUIZHOU UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a nano-cermet inert anode material for electrolytic aluminum, to overcome the problems of poor electrical conductivity, difficulty in processing and large-scale existing in the existing cermet inert anode, and to solve the problem of frequent cracks in the electrode body and increase electrical conductivity

Method used

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  • Nanometer metal ceramic inertia anode material for electrolytic aluminum and preparation method thereof

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Embodiment

[0032] (1) Mix 104g of 200-mesh nickel oxide with 62g of 200-mesh iron oxide powder, and sinter at 1150°C to obtain NiO-NiFe 2 o 4 Cermet matrix sintered material;

[0033] (2) After the sintered material is crushed, grind it with a QM-4H ball mill, and pass through a 200-mesh sieve to obtain the sintered powder;

[0034] (3) Add 34g of Cu powder to the sintered powder, and then add 7.2g of nano-NiO; after mixing, ultrasonically treat in alcohol with a mass fraction of 95% for 30min;

[0035] (4) Add sodium polyacrylate, continue the ultrasonic treatment for 30 minutes and adjust the pH value to be greater than 8 by adding sodium polyacrylate; then use a ball mill to grind the powder for 2 hours, add HCl to adjust the pH to be less than 6, and obtain a slurry;

[0036] (5) The slurry is left to settle for 1 hour, filtered, and dried at 140°C;

[0037] (6) Add paraffin wax of 5% of the total mass of the mixture in the mixture as a plasticizer, mix well, and use 30 tons of un...

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Abstract

The invention relates to a nanometer metal ceramic inertia anode material for electrolytic aluminum and a preparation method thereof. The anode material is prepared by adding metal Cu powder and nanometer NiO into a metal ceramic matrix NiO-NiFe2O4 prepared from Ni2O3 and Fe2O3 which serve as raw materials, wherein the anode material comprises the following raw materials in percentage by mass: 52 to 54 percent of Ni2O3, 31 to 33 percent of Fe2O3 and 15 to 20 percent of Cu powder; and the addition amount of the nanometer NiO is 3 to 6 percent of the total mass of the raw materials. The preparation method comprises the following steps of: mixing nickel protoxide powder and iron oxide powder, and sintering to obtain a ground mass NiO-NiFe2O4; (2) grinding and sieving the ground mass; (3) adding copper powder and the nanometer NiO in the powder, and performing ultrasonic processing in industrial ethanol; (4) adding a dispersing agent and regulating a pH value, performing ball milling, and regulating the pH value again; (5) standing, precipitating, filtering and drying to obtain powder; (6) adding a plasticizing agent, mixing uniformly and compacting; and (7) sintering and cooling compacted blanks to obtain the nanometer metal ceramic inertia anode material. In the nanometer metal ceramic inertia anode material, the conductivity can reach 102 <-1>cm<-1> at the temperature of 1,000 DEG C, so the anode material can be used for aluminum electrolysis industry.

Description

technical field [0001] The invention relates to electrochemical electrolysis technology, in particular to an inert anode material composition for electrolytic production of primary aluminum. Background technique [0002] The anode used by the Hall-Elut electrolysis method in the aluminum industry is a carbon anode. During the electrolytic production process, the CO precipitated from the carbon anode and the electrolytic alumina 2 And CO exhaust gas contains carcinogenic polycyclic hydrocarbons and fluorocarbons, causing serious environmental pollution. At the same time, due to the combustion of carbon anodes, the size of the anodes is constantly changing, and the anodes need to be replaced and adjusted, making it difficult to stabilize production. As a result, the energy consumption of electrolytic aluminum production is high and the current efficiency is low. In addition, the large consumption of carbon anodes in the production process also causes waste of resources and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/12C22C29/12C22C1/05
Inventor 吴贤熙罗琨琳朱思昆
Owner GUIZHOU UNIV
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