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Modified anode for hydrometallurgy and preparation method thereof

A hydrometallurgy and modification technology, applied in the direction of metal rolling, metal rolling, metal rolling stand, etc., to achieve the effect of grain refinement, fine grain size and high matrix strength

Pending Publication Date: 2022-03-25
GUIZHOU R & D CENT ON MODERN MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a modified anode for hydrometallurgy and a preparation method thereof by studying the smelting process, rolling conditions, annealing process and activation modification, which improves the hydrometallurgical With the strength and chemical stability of the anode, the problem of easy corrosion of the anode material in the electrolysis process is greatly reduced, and the anode material with high electrocatalytic activity and service life is obtained, which can meet the technical requirements of the anode material in the field of hydrometallurgy

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  • Modified anode for hydrometallurgy and preparation method thereof

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Embodiment 1

[0027] The preparation method of modified anode for hydrometallurgy includes four steps of two-step remelting smelting, cross rolling, vacuum annealing and mechanical activation.

[0028] The two-step remelting process is to melt the lead and rare earth with a purity greater than 99.99% in a vacuum electromagnetic induction furnace with a vacuum degree of 0.01-1Pa and a melting temperature of 600-1000°C, and repeat the melting three times to form a alloy with uniform composition. Pb-RE master alloy: melt Pb-RE master alloy with one or more of lead, silver, calcium or / and tin alloy elements with a purity greater than 99.99%, the melting temperature is 500-900°C, and the holding time is 20- After 50 minutes, pour the smelted molten metal into a mold to form a lead alloy thick plate.

[0029] The mass percent of each element of the Pb-RE master alloy is: Pb: 95%-99%, RE: 1%-5%.

[0030] The cross-rolling is as follows: after the lead alloy thick plate is cooled to room temperatu...

Embodiment 2

[0045] A modified anode for hydrometallurgy and a preparation method thereof, the specific steps are as follows:

[0046] (1) Two-step remelting smelting: Melting lead and rare earth with a purity greater than 99.99% in a vacuum electromagnetic induction furnace with a vacuum degree of 0.1Pa and a melting temperature of 800°C, repeated smelting three times, and smelting into Pb-5 with uniform alloy composition %RE master alloy. The Pb-5%RE master alloy is smelted with lead and silver with a purity greater than 99.99%. The melting temperature is 750°C and the holding time is 25min. 0.05% RE thick plate.

[0047] (2) After cooling the prepared thick plate to room temperature, carry out cross rolling to obtain 6mm Pb-0.5%Ag-0.05%RE; the single rolling deformation is 5%, and the final rolling deformation is 92.5%.

[0048] (3) Vacuum annealing: heat the thin plate to 120°C at a controlled rate of 3°C / min, keep it warm for 20min, and cool with the furnace.

[0049] (4) Mechanica...

Embodiment 3

[0054] A modified anode for hydrometallurgy and a preparation method thereof, the specific steps are as follows:

[0055] (1) Two-step remelting smelting: Melting lead and rare earth with a purity greater than 99.99% in a vacuum electromagnetic induction furnace with a vacuum degree of 0.1Pa and a melting temperature of 800°C, repeated smelting three times, and smelting into Pb-5 with uniform alloy composition %RE master alloy. Smelt Pb-5%RE master alloy with lead, silver and calcium with a purity greater than 99.99%. The melting temperature is 750°C and the holding time is 30min. The melted metal is poured into a mold for molding to obtain Pb-0.2Ag -0.08% Ca-0.1% RE thick plate.

[0056] (2) After the prepared thick plate is cooled to room temperature, cross rolling is carried out to obtain 4mm Pb-0.2Ag-0.08%Ca-0.1%RE; the single rolling deformation is 5%, and the final rolling deformation is 95% %.

[0057] (3) Vacuum annealing: heat the thin plate to 150°C at a controlle...

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Abstract

The invention relates to a modified anode for hydrometallurgy and a preparation method thereof. The preparation method of the modified anode for hydrometallurgy comprises four steps of two-step remelting smelting, cross rolling, vacuum annealing and mechanical activation. A two-step remelting method is adopted to solve the problem of element burning loss and reduce the smelting cost; by means of cross rolling and vacuum annealing processes, grain size and organization structure are refined, dislocation entanglement in grains is reduced, material strength is improved, cell voltage of an alloy anode is reduced, and current efficiency is improved. The cobalt powder is embedded into the anode plate by utilizing the high diffusion performance of the nano layer through mechanical activation treatment, so that the surface of the anode material is modified and strengthened, the mechanical property and the electro-catalytic activity of the anode material are improved, and the problems of low strength, poor conductivity and short service life of the anode material in the hydrometallurgy process are obviously reduced.

Description

technical field [0001] The invention belongs to the technical field of anode materials for hydrometallurgy, in particular to a modified anode for hydrometallurgy and a preparation method thereof. Background technique [0002] In recent years, hydrometallurgy technology has played an increasingly important role in the smelting of non-ferrous metals such as zinc, manganese and copper due to its advantages of less pollution, low cost and high purity. The preparation of anode materials for hydrometallurgy is a key process in the hydrometallurgy process, and the composition and properties of anode materials play a crucial role in it. Lead alloy anodes are still used today because of their cheap price, simple preparation process, and stable operation in acidic electrolytes. However, long-term production practice has found that traditional lead alloy anodes still have defects such as low strength, poor electrical conductivity, low electrocatalytic activity, and poor corrosion resi...

Claims

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Application Information

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IPC IPC(8): C25C7/02C22C11/00C22C11/06C22C1/02C22F1/02C22F1/12C21D9/46B22F7/04B21B1/02B21B3/00B21B13/02
CPCC25C7/02C22C11/00C22C11/06C22C1/02C22F1/02C22F1/12C21D9/46B22F7/04B21B1/026B21B3/00B21B13/023B22F2007/042
Inventor 黄健胡志同李武斌李勇张谊杜洪伍叶昌美任康铭
Owner GUIZHOU R & D CENT ON MODERN MATERIALS