[China Aluminum Network] Analysis of Three Wastes from Surface Treatment Plating Wastewater Aluminium hard alum flower wastewater from electroplating production process, aluminum surface treatment is a large amount of emissions and has a more direct impact on the environment of the dirt. Due to the long process flow of electroplating MIL-A-8625, there are many processes involved and each procedure requires a variety of cooking products. Each process must be cleaned before entering the next process. This makes the electroplating waste Lin not only has a large amount, but also has a complex composition and often contains a variety of harmful substances, and direct emissions will certainly cause environmental pollution. Some are still long-term and difficult to eliminate. For example, various heavy metal conglomerates will accumulate in the water body and accumulate in the human body. Once a certain concentration is reached, a hazard will occur and it will be difficult to eliminate once the hazard occurs. In the 1970s, rice was contaminated by heavy metal cadmium in the 1970s. The surrounding people ate the rice there and drank the water there. As a result, a strange disease called pain disease developed. The patient's body was painful and the bones were brittle. It is easy to break. Even the cats were often dropped into the river because their legs were broken. They were said to be suicide cats. Since then, cadmium plating has become a strictly restricted type of plating. 2. Exhaust gas The exhaust gas generated during the anodized aluminum plating process is mainly the various acid mists, alkali mists, and heated steam during the pretreatment process. In addition, the cathode gas in the plating process brings out the deposition gas containing the plating solution. All kinds of acid-base fog mainly cause pollution to the operating environment and directly harm the skin and nasopharynx of the production workers. Some will also cause pollution to the surrounding environment and cause trees to die. The electroplating gas is more severe with chrome plating because the current efficiency of chrome plating is only about 12%. A large amount of hydrogen evolution makes the caseinous acid mist during chrome plating a serious pollutant. The promotion of trivalent chromium plating technology and the development of chromium-plated coatings are now carried out in order to eliminate the special plating of chromium plating. The cyanide plating species, such as cyanide copper plating, cyanide zinc plating, and cyanide silver plating, are all toxic gases. In the replacement of technologies and processes, cyanide-free plating processes should be implemented. 3, waste residue The waste residue generated during the aluminum oxide electroplating electroplating production process is mainly the sludge containing heavy metal salts precipitated in the sedimentation tank after the waste water treatment. The direct waste in the electroplating production process includes anode slime, plating cylinder feet, disposable racks, wire ties, polished dust and other recyclable waste. Precipitated sludge is a troublesome process because it contains salts of various metal ions. ZHEJIANG KINGSIR VALVE CO., LTD. , https://www.kingsirvalves.com
Analysis of Three Wastes Produced by Aluminum Surface Treatment Plating