A method for preparing metal powder by electrodeposition

Abstract

The invention discloses a method and device for preparing metal powder in an electro-deposition manner, and belongs to the field of an electrochemical technology and equipment. According to the method and device, electrolyte is electrolyzed by adopting graphite felt or carbon felt as anode materials; and the form and the size of the metal powder deposited at cathodes can be adjusted by adjusting working currents. According to the method and device for preparing metal powder in an electro-deposition manner, the graphite felt or the carbon felt, which has an extremely large specific surface area, is adopted as an anode, so that the anode can obtain great working currents under the condition that the electric current density is extremely small, and phenomena of"air curtain" and electrolytic corrosion of conventional dense anode materials can be avoided; and besides, the graphite felt or the carbon felt is easy to cut and can be spliced, so that the anode is extremely convenient to make; additionally, the electric current density of the cathode is increased, so that a cathode product is changed from compact into loose, the shape of the cathode product is changed from blocks or tablets into particles or powder, and in terms of form, the cathode product is changed from big to small, and a metal powder collecting mechanism is facilitated to continuously and automatically collect cathode metal powder.

Description

technical field [0001] The invention relates to an electrodeposition method, in particular to a method for preparing metal powder by electrodeposition, which belongs to the technical field of electrochemistry. Background technique [0002] There are two types of anode materials for hydrometallurgical electrodeposition production of metal devices: one is metal materials, and the other is non-metallic carbon-based materials. Typical metal anode materials such as titanium or titanium alloys are conductive after being doped, and have been widely used in the field of electrochemistry. However, the high price and complicated manufacturing process of titanium-based anodes are also factors that limit their application. Carbon-based materials can also be used for cathode and anode materials of electrodeposition devices, and carbon powder is generally used as raw material mixed with binder to press or sinter. Commonly used carbon-based electrodeposition anodes are solid forms such as...

AI Technical Summary

Problems solved by technology

When the above-mentioned carbon-based materials are used as electrodeposition anodes, they have the following disadvantages: (1) gas is precipitated on the surface of the anode, forming an "air curtain", which affects the effective contact and conduction between the electrolyte and the anode plate; (2) the area and surface area of ​​the anode plate Similarly, when the cathode plate needs a large working current, the anode plate should increase the surface area current density, but when the density exceeds a certain strength, most of the anode plates will have surface graphite peeling and anode electrolysis

There are the following problems: (1) The production efficiency is low. Generally, there are multiple cathodes in an electrolytic cell. After one of the cathodes is taken out of the electrolytic cell, the entire electrolytic cell needs to be stopped (or intermittently stopped); (2) To improve the cathode product Production efficiency is difficult. On the one hand, in order to remove the cathode product as easily as possible, the electrodeposition time needs to be shortened as much as possible, but on the other hand, in order to improve the electrodeposition efficiency as much as possible, the electrodeposition time needs to be increased as much as possible. Balance; (3) It is difficult to separate the cathode product (metal in a dense state) from the electrode, resulting in time-consuming and laborious stripping process, and it is easy to cause damage to the cathode plate

Therefore, at present, the efficiency of electrolytic metal production by electrodeposition is low, and the cost is high.

In addition, in the later application of electrodeposited metals, powdering is an important form. Traditional electrodeposited metals also need to be powdered for further processing, which greatly increases the cost of product application.

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