Method for recycling chromic acid in electroplating waste water

Abstract

The invention discloses a method for recycling chromic acid in electroplating waste water. A complete set of method which can be used for directly and efficiently recycling chromic acid from electroplating cleaning solution and obtaining chromic acid crystals is designed by making use of technical means such as ion exchange, atomization, evaporation, extraction, crystallization, separation and the like and comprehensively utilizing experiences obtained in practice and a method obtained by researches and experiments. Problems existing in the conventional recycling treatment technical method are solved by the method and chromic acid in electroplating waste water is recycled directly by the complete set of method so as to obtain a chromic anhydride raw material. Chromic acid in electroplating chromium-containing waste water is recycled fully by a complete set of device and is taken as an industrial raw material, so that a waste material is recycled, the environment is protected, resources are saved and remarkable economic, social and environmental benefits are achieved. The method is an important innovation for clean production, environmental protection and resource utilization technology.

Description

technical field [0001] The invention belongs to the technical field of recovery and treatment of heavy metals in waste water, in particular to a technology for the recovery and treatment of chromic anhydride in electroplating waste water. Background technique [0002] Heavy metals in electroplating wastewater, especially chromic acid, are the most toxic and are recognized as one of the environmental carcinogens (Schmieman E A, Petersen J N, Yong e D R, et al. Bacterial Reduction of chromium [J]. Appl Biochem Biotechnol, 1997, ( 63-65): 855.). It destroys the metabolism of organisms and is a protein coagulant that can precipitate proteins in the blood; inhaling dust containing chromic acid will cause respiratory inflammation; drinking wastewater containing chromic acid will cause anemia, nephritis, neuritis, etc. Disease; chromic acid is also irritating to the skin and can cause ulcers. Long-term intake can cause body sarcoma, squamous cell carcinoma, adenocarcinoma and oth...

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Problems solved by technology

[0004] In view of these problems, the inventor of this method, in April 2010, in the "method for recovering copper ions in copper plating cleaning solution" (patent number: 200810235197.1) and "complete set of metal ion recovery equipment in electroplating cleaning solution" (patent number : 200920039808.5) and other patents, the invention of "Method for On-line Classification and Recycling of Electroplating Cleaning Water" (Application No.: 201010156033.7) was completed. These inventions realized the recycling and zero discharge of electroplating wastewater, and also completed the Efficient recycling of most of the heavy metals in the medium, but due to the special properties of chromic acid, the above method is not economical and effective for it

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