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A kind of preparation method of aluminum-based multiphase inert composite anode material

An inert composite anode and anode technology, applied in the field of metal surface treatment, can solve the problems of low life, low oxygen evolution overpotential, high cost, etc., and achieve the effects of improving grade, reducing oxygen evolution overpotential, and reducing power consumption

Active Publication Date: 2017-02-15
KUNMING HENDERA SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research on Pb-based alloy anodes mainly focuses on the research and development of Pb-Ag, Pb-Ca, Pb-Ag-Ti, Pb-Ca-Sn and other alloy materials. In the research of new inert energy-saving anodes, Ti is mainly used as matrix PbO 2 or MnO 2 and other metal oxides are used as the anode material of the outer layer. Although the latter has a low oxygen evolution overpotential, its high cost and low lifespan make it difficult to replace the traditional lead-based alloy anode.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Pre-treatment of the aluminum substrate for physical grinding and degreasing:

[0025] Sand with 120-grit sandpaper and degrease with an industrial alkaline degreaser. The specific steps are: grinding → washing → degreasing (the composition of the degreasing agent is: Na 3 PO 4 40g / L, Na 2 SiO 3 15g / L, 1-3min) → water washing → alkali leaching (NaOH 20 g / L, NaOH 2 CO 3 2 g / L, 1min)→water washing→acid leaching (HF 10ml·L -1 , HNO 3 250ml·L -1 , H 3 PO 4 250ml·L -1 , 3min) → wash with water.

[0026] (2) Carry out two-step galvanizing sequentially on the aluminum substrate treated in step (1):

[0027] Carry out two-step galvanizing on the pre-treated aluminum substrate, two-step galvanizing process formula: pre-treated Al substrate→water washing→one-time galvanizing (60 seconds)→water washing→zinc stripping (20 seconds, use 1:1 HNO 3 Solution dissolution and zinc removal)→Secondary galvanizing (40 seconds), the temperature is controlled at room tem...

Embodiment 2

[0032] In this example, steps (1)~(3) are the same as in Example 1; the difference is that in step (4), the stainless steel plate is used as the cathode at a temperature of 80°C and the anode current density is 40mA / cm 2 , Under the condition of mechanical stirring 250r / min, electroplating for 2 hours, the anode after electroplating was washed with water and dried to obtain aluminum-based PbO 2 -MnO 2 -CeO 2 -WC inert composite anode material; wherein, the plating solution formula is: lead nitrate (Pb(NO 3 ) 2 ) 220g / L, 50% manganese nitrate solution (Mn(NO 3 ) 2 ) 50g / L, sodium fluoride (NaF) 1.5g / L, cerium oxide (CeO 2 The particle size is: 10~30nm) 15g / L, tungsten carbide (WC particle size is 3μm) 30g / L; before electroplating, the electroplating solution is ultrasonically dispersed for 40 minutes.

[0033] The aluminum-based β-PbO prepared in this example 2 -MnO 2 -CeO 2 The thickness of -WC composite coating is 130~160μm, the content of Ce element in the coating i...

Embodiment 3

[0035] Steps (1)-(3) in this example are the same as in Example 1; the difference is that in step (4) the stainless steel plate is used as the cathode at a temperature of 60°C and the anode current density is 20mA / cm 2 1. Under the condition of mechanical stirring 200r / min, electroplating for 1 hour, the anode after electroplating was washed with water and dried to obtain aluminum-based PbO 2 -MnO 2 -CeO 2 -WC inert composite anode material; wherein, the plating solution formula is: lead nitrate (Pb(NO 3 ) 2 ) 250g / L, 50% manganese nitrate solution (Mn(NO 3 ) 2 ) 70g / L, sodium fluoride (NaF) 2g / L, cerium oxide (CeO 2 The particle size is: 20~30nm) 20g / L, tungsten carbide (WC particle size is 1μm) 40g / L; the electroplating solution is ultrasonically dispersed for 30 minutes before electroplating.

[0036] The aluminum-based β-PbO prepared in this example 2 -MnO 2 -CeO 2 The thickness of -WC composite coating is 140~180μm, the content of Ce element in the coating is 9.0...

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Abstract

The invention relates to a preparation method of an aluminum-based multiphase inert composite anode material, and belongs to the technical field of metal surface treatment. The aluminum-based PbO2-MnO2-CeO2-WC multiphase inert composite anode material doped by nanometer cerium oxide and micrometer tungsten carbide is prepared through an anodization technology, a coating layer of the material has a dark-black compact crystallization surface, has a thickness of 90-180[mu]m, and has good adhesion with a substrate. When the composite anode material is used as an anode in zinc electrowinning, the surface of the anode is in a non-soluble state as a conductive multiphase composite material, so the pollution of the dissolving of traditional lead and a lead-based alloy anode to a cathode zinc is avoided, and the quality of the cathode product is improved; the addition of tungsten carbide (WC) with good electrocatalytic activity and electrical conductivity enhances the electrocatalytic activity of electrode materials, and the bath voltage of the anode of the invention is 0.2-0.5V lower than that of traditional lead and silver alloy anodes, and is stable, so the power consumption is effectively reduced; and the addition of a rare earth oxide CeO2 makes the grains of the coating refined and the coating compact and flattened, so the corrosion resistance of the material is effectively improved.

Description

technical field [0001] The invention relates to a preparation method of a multiphase inert composite anode material, which belongs to the technical field of metal surface treatment. Background technique [0002] In the hydrometallurgy process, Pb-Ag alloy anodes are widely used. This type of anode material can meet the basic needs of electrolytic zinc production, but there are also many inherent defects that are difficult to improve, such as: easy to bend and deform to cause short circuit, The large weight leads to difficult assembly, high energy consumption in the electrowinning process, and low electrocatalytic activity of the anode. At the same time, the anode lead is easily converted to Pb 2+ The ionic form dissolves into solution and deposits at the cathode, degrading the cathode zinc product grade. In order to solve the above problems, scientists on the one hand modify the traditional Pb-based alloy anode, on the other hand continue to explore and develop new inert e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C7/02C25C1/16
CPCY02P10/20
Inventor 陈阵高紫明余强范莹莹晁恒
Owner KUNMING HENDERA SCI & TECH