A kind of preparation method of nano-pbo2-acf inert anode material for zinc electrowinning

An inert anode, zinc electrowinning technology, applied in electrodes, metal material coating processes, electrolytic components, etc., can solve the problems of reduced coating effect, short service life, low current efficiency, etc., to reduce the occurrence of reactions and improve conductivity. The effect of high pass efficiency and conduction efficiency

Active Publication Date: 2019-04-02
KUNMING UNIV OF SCI & TECH +1
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  • Description
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  • Application Information

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Problems solved by technology

In the extraction process, lead and lead alloys are mainly used as anode materials. The disadvantages are: high electrolytic cell voltage (3.0-4.0V), low current efficiency (75-85%), and short service life of the anode (0.5-1 year). The energy consumption of the electrowinning process is high (3000-4000 degrees per ton of zinc), and the anode material is easily dissolved and enters the plating solution, and then enters the cathode product, which seriously affects the product quality
[0003] 1. Lead-silver binary and multiple alloy anodes: mainly include lead-silver (Pb-Ag), lead-arsenic (Pb-As), lead-calcium (Pb-Ca), lead-silver-calcium (Pb-Ag -Ca), lead-calcium-barium (Pb-Ca-Ba), lead-calcium-tin (Pb-Ca-Sn), etc., the main disadvantages of this type of anode are: (1) short service life; (2) energy consumption High; (3) It is easy to pollute the cathode product
[0004] 2. Titanium-based surface coating / plated anode: use metal titanium (Ti) as the substrate, and coat or plate a layer of noble metal or its oxide on the surface. The main disadvantages of this type of anode are: (1) The cost of the titanium substrate is high; (2) ) The coating is easily dissolved and the titanium substrate is easily passivated, resulting in a short life of the anode; (3) The solution contains impurity ions, which adhere to the anode and reduce the effect of the coating
[0005] 3. Titanium-based oxide anode: With metal titanium (Ti) as the substrate, a thin film of lead dioxide (PbO) is deposited on the surface of the substrate by electrodeposition. 2 ), followed by deposition of manganese dioxide (MnO 2 ), forming Ti-PbO 2 -MnO 2 Composite electrodes, the main disadvantages of this type of anode are: (1) high cost of titanium substrate; (2) complicated preparation process; (3) short service life
The main disadvantages are: (1) the process is too long and the energy consumption is high; (2) waste liquid is generated and the environment is polluted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A kind of nanometer PbO for zinc electrowinning 2 -The preparation method of ACF inert anode material, its concrete method is as follows:

[0027] (1) Preparation of activated carbon fibers: First, cut the carbon fibers into small pieces of 5 × 5 cm, and then use nitric acid (HNO 3 ) soaking to remove impurities, soaking time 1h. The soaked activated carbon fiber (ACF) was repeatedly washed with distilled water for several times, and then placed in a hot air oven for drying at a drying temperature of 50°C. Finally, the activated carbon fiber (ACF) was placed in a nitrogen (N 2 ) in a holding furnace for 3 hours at a temperature of 100°C. Then put the treated carbon fiber into silver ammonia solution for ultrasonic treatment, wash with distilled water, and dry in vacuum to obtain activated carbon fiber.

[0028] The preparation method of described silver ammonia solution is as follows: in the silver nitrate solution of 0.04mmol / L, add the sodium hydroxide that soluti...

Embodiment 2

[0033] A kind of nanometer PbO for zinc electrowinning 2 -The preparation method of ACF inert anode material, its concrete method is as follows:

[0034] (1) Preparation of activated carbon fibers: First, cut the carbon fibers into small pieces of 5 × 5 cm, and then use nitric acid (HNO 3) soaking to remove impurities, soaking time 1h. The soaked activated carbon fiber (ACF) was repeatedly washed with distilled water for several times, and then placed in a hot air oven for drying at a drying temperature of 50°C. Finally, the activated carbon fiber (ACF) was placed in a holding furnace filled with neon gas (Ne) for 1 h at a temperature of 200°C. Then put the treated carbon fiber into silver ammonia solution for ultrasonic treatment, wash with distilled water, and dry in vacuum to obtain activated carbon fiber.

[0035] The preparation method of its silver-ammonia solution is as follows: in the silver nitrate solution of 0.02mmol / L, add the sodium hydroxide that solution mass...

Embodiment 3

[0040] A kind of nanometer PbO for zinc electrowinning 2 -The preparation method of ACF inert anode material, its concrete method is as follows:

[0041] (1) Preparation of activated carbon fibers: First, cut the carbon fibers into small pieces of 5 × 5 cm, and then use nitric acid (HNO 3 ) soaking to remove impurities, soaking time 1h. The soaked activated carbon fiber (ACF) was repeatedly washed with distilled water for several times, and then placed in a hot air oven for drying at a drying temperature of 50°C. Finally, the activated carbon fiber (ACF) was placed in an argon (Ar) holding furnace for 1.5 h at a temperature of 300 °C. Then put the treated carbon fiber into silver ammonia solution for ultrasonic treatment, wash with distilled water, and dry in vacuum to obtain activated carbon fiber.

[0042] The preparation method of its silver-ammonia solution is as follows: in the silver nitrate solution of 0.01mmol / L, add the sodium hydroxide that solution mass percentag...

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Abstract

The invention discloses a preparation method of a nanometer PbO2-ACF inert anode material for zinc electro-deposition. The method comprises the following steps: growing nano lead dioxide (PbO2) on anactivated carbon fiber (ACF) matrix by adopting a microwave heating method, thereby obtaining the nanometer PbO2-ACF inert anode material. When the inert anode material prepared by the method disclosed by the invention is adopted for zinc electro-deposition, compared with the traditional lead silver alloy (0.8%), the inert anode material has the advantages that the activated carbon fiber (ACF) conduction efficiency is high, the metal electro-deposition current efficiency is increased by 2-4%, and the cell voltage is reduced by 0.2-0.4V; and the nano lead dioxide (PbO2) on the matrix surface islarge in specific surface area, high in reaction activity, capable of reaching the service life exceeding 2 years and difficult to dissolve, the plating solution is not contaminated, and the qualityof the cathode product is improved.

Description

technical field [0001] The invention relates to the technical field of anode preparation for hydrometallurgy. Background technique [0002] In the field of metallurgical technology, the method of extracting metallic zinc is mainly hydrometallurgy. In the extraction process, lead and lead alloys are mainly used as anode materials. The disadvantages are: high electrolytic cell voltage (3.0-4.0V), low current efficiency (75-85%), and short service life of the anode (0.5-1 year). The electrowinning process consumes a lot of energy (3000-4000 degrees per ton of zinc), and the anode material is easily dissolved and enters the plating solution, and then enters the cathode product, seriously affecting product quality. In order to improve the current efficiency of electrowinning zinc, reduce the energy loss in the electrowinning process, reduce environmental pollution, and improve the quality of cathode products, in-depth research and exploration and development have been carried ou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C7/02C25C1/16C23C18/12C23C18/44
CPCC23C18/1216C23C18/1225C23C18/1653C23C18/1666C23C18/44C25C1/16C25C7/02Y02P10/20
Inventor 陈步明黄惠郭忠诚汪世川王腾
Owner KUNMING UNIV OF SCI & TECH
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