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Preparing and assembling process of inert cermet anode for aluminium electrolysis

A cermet, inert anode technology, applied in the field of anodes used in the production of molten salt electrolysis, can solve the problems that the current intensity is difficult to meet the requirements, and the anode material is difficult to enlarge.

Inactive Publication Date: 2007-06-27
GUIZHOU UNIV
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  • Abstract
  • Description
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Problems solved by technology

So far, the use of inert anode materials is theoretically feasible, but it is only used in laboratories. The key problem is that the anode materials are difficult to scale up.
If it cannot be enlarged, the current intensity is difficult to meet the requirements

Method used

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  • Preparing and assembling process of inert cermet anode for aluminium electrolysis

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Embodiment Construction

[0026] Example Take Fe 2 o 3 , NiO and metal Cu and liquid paraffin are dried with hot air according to conventional methods respectively, and pass through a 60-mesh sieve, according to liquid paraffin / (NiO+Fe 2 o 3 +Cu)=7% mixed evenly, in which NiO, Fe 2 o 3 , The mass ratio of Cu is NiO 52%, Fe 2 o 3 31%, Cu 17%; use 1MPa / cm of the obtained mixture under a 250t press 2 Pressure cold pressing to prepare cermet inert anode compacts; heat the compacts to 1250°C at normal pressure in a silicon carbide rod furnace according to the predetermined sintering system and keep them warm for 5 hours to sinter the anode compact materials and cool them to room temperature to obtain metal Ceramic inert anode product, its size is 160mm×100mm, conductivity is 72Ω -1 cm -1 , the apparent density is 5.3g / cm 3 .

[0027] Use a grinding wheel to grind and polish the surface of the cermet inert anode plate 1, and dig semicircular grooves 2 on both sides above it as shown in Figure 2. T...

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Abstract

The inert cermet anode for aluminum electrolysis is prepared with Fe2O3, NiO or Ni2O3, metal Al, Ni or Cu and additive as materials, and through the steps of stoving, sieving, mixing, cold pressing to form, sintering and cooling to room temperature. The assembling process includes polishing, cutting semi-circular slots, drilling pores, arranging, holding in two stainless steel plates, screws and nuts to form inert cermet anode. The process of the present invention can produce large inert cermet anode plate for current up to 500-600 A to pass through.

Description

technical field [0001] The present invention relates to an anode used in the production of molten salt electrolysis of metals, and further to a cermet inert anode used in aluminum electrolysis. Background technique [0002] As we all know, an inert electrode is an electrode that itself does not participate in the reaction in the electrolytic cell. The carbon anodes currently used in the aluminum electrolysis industry have many problems such as consuming a large amount of carbon materials, high energy loss, and environmental pollution. The use of inert anodes can solve the above problems to a certain extent. People hope to use inert electrodes in the electrolytic aluminum industry for many years. Chinese patent application No. 89210028.1 "Aluminum electrolytic cell structure with inert electrodes" discloses the application method of inert electrodes. Metal-ceramic inert anodes prepared by electrolysis of metals" and No. 03132536.X "Cuprous oxide-based cermet inert anode mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/12
Inventor 吴贤熙刘卫张立成徐利华
Owner GUIZHOU UNIV
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