Chromium plating fog recovery and purification device

Abstract

The invention discloses a chromium plating fog recovery and purification device, and belongs to the technical field of chromium plating waste gas recovery processing technology. The chromium plating fog recovery and purification device includes a chromium fog channel, the chromium fog channel is formed by a plurality of stages of recovery and purification chambers, the plurality of stages of recovery and purification chambers are connected in series in turn, and are communicated with a chromium plating bath and a fan for pumping air. Each recovery and purification chamber comprises a condensing chamber and a recovery water tank, the upper part of the condensing chamber is provided with a spraying device, the recovery water tank is located below the condensing chamber, and the recovery water tank is correspondingly communicated with the condensing chamber, and a next-stage recovery water tank supplies water for the spraying device of a front-stage recovery and purification chamber. The plurality of stages of recovery and purification chambers are used for physical interception of chromium fog in the chromium plating bath, and the whole recovery and purification process is free of wastewater discharge and physical maintenance.

Description

technical field [0001] The invention relates to a device for recovering and purifying chrome-plating mist, which belongs to the technical field of recovery and treatment process of chrome-plating waste gas. Background technique [0002] Chromium plating is one of the most widely used plating types in the electroplating industry. Chromium plating can endow metal materials with excellent corrosion resistance, wear resistance and low friction coefficient. Functional chrome plating can make the surface of the material more bright, hard, anti-tarnish and wear-resistant and corrosion-resistant. Therefore, electrochrome plating, as a surface treatment technology, has been widely used in hardware, electromechanical, automotive and aerospace Protection of the surface of key mechanical parts and other industries. [0003] For a long time, the chromium plating process is a hexavalent chromium electroplating process using chromic acid as the chromium source. During chrome plating, be...

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Problems solved by technology

During chrome plating, because the chrome plating solution in the chrome plating bath needs to be heated up and kept at a higher chrome plating temperature, chrome plating mist will evaporate; at the same time, due to the presence of current in the solution during the chrome plating process, a large amount of hydrogen gas is generated at the cathode, which will also Bring a large amount of chrome mist exhaust gas, and the chromium mist will cause the loss of chromic acid to be as high as 30%.

In order to reduce the damage to personnel and equipment caused by the chrome mist in the chrome plating workshop, all electroplating workshops are equipped with ventilation equipment. After being outdoors, it will also pollute the surrounding environment. How to prevent chromic acid waste gas from polluting the atmosphere has become a difficult problem that needs to be solved

[0004] At present, the treatment method for chromium mist is to directly lead the outlet of the exhaust air pipe into the water tank, so that the chromium mist from the chrome plating workshop can be dissolved in water. There must be waste gas discharged into the air, affecting the surrounding environment; in addition, the wastewater that dissolves the chromium mist needs to be treated

Another method is to recycle the chromium mist. The chromium mist recovery period filled with plastic grid balls is used to collect the chromium mist. The chromium mist recovery device has the following problems: 1. The chromium mist recovery device only uses fixed filled plastic Grid balls are used to realize the recycling of chromium mist. If the time is long, the chromium mist will scale on the plastic grid balls and gradually block the small holes of the plastic grid balls, resulting in increased wind resistance and poor treatment effect; 2. Chromium mist The collector is difficult to maintain and difficult to operate and maintain

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