Chroming production equipment without chromium containing waste emission

Abstract

The invention discloses chroming production equipment without chromium containing waste emission. A chroming groove, a cleaning device, a chromic acid recycling device, a waste treatment device, an acid resisting liquid pump and a chroming chamber are included. The chroming groove communicates with the cleaning device, the chromic acid recycling device and the waste treatment device through a pipeline. The chromic acid recycling device comprises a gas collecting hood, a gas conveying device, a recycling tower, a centrifuge machine and a neutralization tower. The waste treatment device comprises a center groove, a circulation liquid pump, a filter, a recycling box, a filter press and an air pump. The acid resisting liquid pump is arranged on a pipeline between a first-level cleaning grooveand the recycling tower. The chroming chamber is connected with the recycling tower through a pipeline. According to the chroming production equipment, through the chroming groove, the cleaning device, the chromic acid recycling device, the waste treatment device, the acid resisting liquid pump and the chroming chamber, material balance can be controlled, and chrome containing waste water is not generated; and in the chromic acid recycling device, the character that cooling is conducted on chrome mist for adsorption of chromic acid is utilized, the chromic acid recycling capability is improved, and gas emission reaches the standard.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to a chromium-plating production equipment without chromium-containing waste discharge. Background technique [0002] In the production and treatment of workpiece chrome plating, first, when cleaning the electroplated workpiece, the chromium-containing cleaning sewage produced is directly discharged into the sewer pipe, causing water pollution; second, in the chromium plating process, due to the use of insoluble anodes, the cathode current efficiency is low. When the gas is very low, a large amount of hydrogen and oxygen are precipitated. When the gas escapes from the liquid surface, it contains chromic acid, which forms chromium mist and is discharged into the air, causing serious pollution to the atmosphere; Some solid debris is produced, namely industrial waste residue containing chromium. When the waste residue is soaked by rain and snow, the contained hexavalent chromium...

AI Technical Summary

Problems solved by technology

[0002] In the production and treatment of workpiece chrome plating, first, when cleaning the electroplated workpiece, the chromium-containing cleaning sewage produced is directly discharged into the sewer pipe, causing water pollution; second, in the chromium plating process, due to the use of insoluble anodes, the cathode current efficiency is low. When the gas is very low, a large amount of hydrogen and oxygen are precipitated. When the gas escapes from the liquid surface, it contains chromic acid, which forms chromium mist and is discharged into the air, causing serious pollution to the atmosphere; Some solid debris is produced, that is, industrial waste residue containing chromium. When the waste residue is soaked by rain and snow, the hexavalent chromium contained in it will be dissolved and infiltrated into groundwater or into rivers and lakes to pollute the environment, causing greater harm.

For the discharge of three wastes during the production and treatment of workpiece chrome plating, the waste liquid sewage is treated by the enterprise's own sewage treatment device or sent to the sewage treatment plant for unified treatment. This method greatly increases the production cost of the enterprise; the waste gas chromium mist To deal with it, foam plastic fragments or fragments are placed on the liquid surface of the plating solution to block the escape of chromium mist, but it is inconvenient to operate when the workpiece is out of the tank; in addition, chromic acid has a strong oxidation ability and has a strong immersion effect on the added fragments. Corrosion, so that decomposition products accumulate in the bath, affecting the quality of the coating

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