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A kind of nickel-based metal oxide ceramic inert anode, preparation method and application

A technology of oxide ceramics and inert anodes, applied in electrodes, electrolytic components, electrolysis processes, etc., can solve the problems of expensive and unstable inert anode materials, achieve strong resistance to molten salt chemical corrosion and electrochemical corrosion, and high temperature resistance Strong oxidation resistance and good thermal shock resistance

Active Publication Date: 2018-11-09
UNIV OF SCI & TECH BEIJING
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of expensive and unstable inert anode materials in chloride melts in the prior art, and provide a nickel-based metal oxide ceramic with strong stability, low cost and suitable for chloride molten salt systems inert anode

Method used

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  • A kind of nickel-based metal oxide ceramic inert anode, preparation method and application
  • A kind of nickel-based metal oxide ceramic inert anode, preparation method and application
  • A kind of nickel-based metal oxide ceramic inert anode, preparation method and application

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preparation example Construction

[0026] The embodiment of the present invention is a kind of preparation method of nickel-based metal oxide ceramic inert anode (for the preparation process see figure 1 ), including the following steps:

[0027] Step 1, CaO and TiO 2 Weigh and mix according to the ratio of (25.85~58.39wt%): (74.15-41.61wt%), and calcinate in a muffle furnace at 900°C for 4-6 hours, and grind the sintered block to obtain the oxide phase powder;

[0028] Step 2. Prepare metal oxide uniform mixed powder by ordinary ball milling method: weigh the metal mixed powder mentioned above, and mix it with the oxide powder prepared in step 1 according to the ratio of (40-60 wt%): (60-40 wt%) , and put them into the ball mill together for 12 hours of dry grinding; the ordinary ball mill not only has two functions of mixing and grinding, but the metal and oxide mixed powder after more than 12 hours of ball milling not only plays the role of further grinding and mixing, but also It also promotes the mutual...

Embodiment 1

[0038] Using metallic nickel as the metal phase raw material, CaO and TiO 2 (the mass ratio of the two is 41.23%:58.77%) is the oxide phase raw material, the mass ratio of the two is 50%:50%, the raw material is carried out as described in the previous preparation steps, and the prepared inert anode is connected to the metal guide rod , as the working anode; the cathode uses a nickel rod, and the electrolyte uses CaCl 2 -LiCl-CaO (molar ratio is 0.35:0.65:0.05), the experimental atmosphere is CO 2 , the reaction temperature is 600°C. After the molten salt system was stabilized, the system was subjected to constant current electrolysis with a current density of 0.36 A / cm 2 , the schematic diagram of the electrolytic structure is shown in figure 2 As shown, in the self-made reaction resistance furnace 3, the left block is the inert anode, the right is the nickel cathode, and the black substance is the deposited carbonaceous material. After more than 16 hours of continuous e...

Embodiment 2

[0040] Using metal nickel and iron (the mass ratio of the two is 75.92%:24.08%) as the metal phase raw material, CaO and TiO 2 (The mass ratio of the two is 41.23%:58.77%) is the oxide phase raw material, the mass ratio of the two is 55%:45%, the raw material is carried out as described in the preparation steps, and the prepared inert anode is connected to the metal guide rod, As a working anode; the cathode uses a nickel rod, and the electrolyte uses CaCl 2 -LiCl-CaO (molar ratio is 0.35:0.65:0.05), the experimental atmosphere is CO 2 , the reaction temperature is 600°C. After the molten salt system was stabilized, the system was subjected to constant current electrolysis with a current density of 0.5 A / cm 2 . After more than 20 hours of continuous electrolysis, the anode released oxygen during the electrolysis process and showed good and stable electrical conductivity, and a large amount of amorphous carbonaceous materials were prepared at the cathode. The weight of the ...

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Abstract

The invention relates to the technical field of ceramic-metal composite materials, and provides a nickel-based metal oxide ceramic material inertia anode. The nickel-based metal oxide ceramic material inertia anode has a metal phase and a ceramic phase, the metal phase is composed of the principal component Ni and one to two elements of Cu, Co, Zn, Cr, Ag, Fe, Al, V and the like, and an oxide phase is composed of CaO and TiO2; and the inertia anode is prepared through the steps that oxide and metal powder are subject to common ball milling, press molding is carried out, protective atmosphere sintering is carried out, and machining is carried out. The nickel-based metal oxide ceramic material inertia anode has the beneficial effects that electrical conductivity is good, high-temperature oxidation resistance is high, fused salt chemistry corrosion resistance and electrochemistry corrosion resistance are high, the thermal shock resistance is good, and the price is relatively low. The inertia anode is used for an electrolysis process in a chloride fused salt system, can serve as a substitution of a carbon anode, and solves the problems of high consumption and high CO2 emission.

Description

technical field [0001] The invention relates to the technical field of ceramic-metal composite materials, in particular to a nickel-based metal oxide ceramic inert anode, a preparation method and an application. Background technique [0002] The preparation of metals and carbonaceous materials by electrolytic reduction in chloride melts containing oxides or carbonates is a research hotspot in recent years (G.Z.Chen, et al. Nature, 2000(407), 361-364; H.Y.Yin, et al. al. Energy & Environmental Science, 2013(6), 1538-1545). [0003] Currently, inert anodes commonly used in chloride molten salt systems mainly include metal and oxide anodes. Metal inert anode materials are mostly metal platinum, iridium, nickel-based and copper-based metal alloys. This type of anode has excellent conductivity and is easy to handle and connect. However, noble metal materials are expensive, not stable enough in chloride melts, and the corrosion rate is too high. Fast; the oxide anode material is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/12C22C32/00C25C7/02C22C1/05C22C1/10C25B11/04B22F3/02B22F3/10
CPCB22F3/02B22F3/10C22C1/05C22C1/051C22C29/005C22C29/12C22C32/001C25B11/04C25C7/025
Inventor 焦树强葛建邦
Owner UNIV OF SCI & TECH BEIJING
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