High temperature conductive binding material for aluminium electrolysis

A technology of bonding materials and aluminum electrolysis, applied in the direction of conductive adhesives, can solve problems such as the difficulty of connecting metal guide rods, and achieve the effects of eliminating heating equipment, manpower and material resources, reducing environmental pollution, and stabilizing production

Inactive Publication Date: 2004-12-08
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, inert anode materials mainly include metal oxide ceramics, alloy anodes and cermets. Among them, except for alloy anodes, metal oxide ceramics and cermet inert anodes have the problem of difficulty in connecting with metal guide rods; TiB 2 Wettable cathodes can be classified as TiB 2 Coating, TiB 2 -C Composites and TiB 2 There are three types of matrix composite ceramics, among which TiB 2 -C Composites and TiB 2 Matrix composite ceramics also have the difficulty of connecting with metal guide rods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: A high-temperature conductive bonding material for connecting continuous prebaked anode carbon blocks. The paste formula of the high temperature conductive bonding material is shown in Table 2.

[0023]

[0024] Mix the materials in Table 2 into a paste, connect the continuous prebaked anode carbon blocks, the bond strength between the carbon blocks is 3MPa, which is greater than the tensile strength of the prebaked anode carbon blocks for aluminum electrolysis; with the increase of temperature , the resistivity of the bonding material drops sharply, and the resistivity at 25°C is 5×10 -3 Ωm, the resistivity at 150°C is 3×10 -4 Ωm, the resistivity at 400°C is 4×10 -5 Ωm (equivalent to the resistivity of prebaked anode carbon blocks under the same conditions), the resistivity at 800°C is 1.9×10 -5 Ωm, which is lower than the resistivity of the prebaked anode carbon block under the same conditions; the continuous prebaked anode carbon block ha...

Embodiment 2

[0025] Embodiment 2: A high-temperature conductive bonding material for connecting an inert anode to a metal guide rod.

[0026]

[0027] Mix the materials in Table 3 into a paste and apply it to the NiFe containing 10wt%Ni 2 o 4 The connection between the / Ni cermet inert anode and the stainless steel guide rod has good bonding strength after curing at room temperature for 2 hours; then hang the inert anode sample above the test aluminum electrolytic cell, and place it in the high temperature resistance furnace along with the test electrolytic cell The temperature is raised to 970°C together, during which the binder of the high-temperature conductive bonding material is carbonized; after the electrolyte is melted, the inert anode is inserted into the electrolyte, 1A / cm 2 Power on and electrolyze for 10 hours, and test the cell voltage of the electrolytic cell at the same time. During the whole electrolysis process, the cell voltage was basically constant at 2.7V...

Embodiment 3

[0028] Embodiment 3: A high-temperature conductive bonding material for connecting cathode carbon blocks and cathode steel rods.

[0029]

[0030] Mix the materials in Table 4 into a paste, which is used for the connection of the cathode carbon block and the cathode steel rod. After curing at room temperature for 2 hours, it is used for the masonry of the aluminum electrolytic cell. During the firing start-up and normal production process of the aluminum electrolytic cell, the cathode current is evenly distributed, no redness of the cathode steel rod is seen, and the temperature at the junction of the cathode steel rod and the cathode bus bar is 100-250°C, indicating the conductivity of the high-temperature conductive bonding material used Good, there are no cracks, delamination and other defects inside the material under the conditions of use.

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Abstract

An electric conducting refractory adhesive for the aluminium electrolysis, especially for carbon anode, carbon cathode, inertial anode and wettable TiB2 cathode, is prepared from electric conducting powder, resin adhesive, solidifying agent, solvent, reinforcing agent and additives. It has high adhesion, electric conductivity, heat shock resistance and high-temp mechanical performance.

Description

Technical field: [0001] The present invention is related to aluminum electrolysis, in particular to aluminum electrolytic carbon anode, carbon cathode, inert anode, TiB 2 The connection of wettable cathodes, and the high-temperature conductive bonding materials used to connect them to metal conductors, and it is also suitable for conductive connections between materials in other high-temperature environments. Background technique: [0002] At present, the cathode and anode materials used in aluminum electrolysis are all carbon materials. The anode carbon block and the conductive steel rod are bonded by casting phosphorus pig iron; the continuous prebaked anode is bonded by carbon paste; the cathode carbon block and the cathode conductive steel rod are bonded by carbon paste or phosphorus pig iron casting knot; so that the carbon block and the carbon block or steel rod are closely connected and play a conductive role. [0003] The current molten salt aluminum electrolysis p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J9/02C25C3/08C25C3/12
Inventor 赖延清李劼李庆余丁凤其田忠良刘宏专李利张吉龙孟杰刘业翔
Owner CENT SOUTH UNIV
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