How to reduce the smoke and dust in the process of hot dip galvanizing correctly?

At present, there is a relatively economical solution to the smog generated in the process of hot dip galvanizing, which is to collect zinc vapor by wet method and remove smoke and acid by dust removal and water spraying. It can extract and remove more than 75% to 95% of the smoke and dust, and improve the operating environment of hot galvanizing. The technical programme in this regard has been described in detail {2}. According to the concept of "standard, the cooperative governance", fundamentally solve the ammonium chloride under the condition of high temperature decomposition production Chinese white smoke is one of the important aspects, some domestic research institutes and universities of science and technology have noticed this problem, this hand is committed to research and development without ammonium plating aid, the purpose is to replace the current zinc chloride and ammonium chloride by mixing plating aid ammonium chloride; The development of ammonium chloride - free additives has become a developing trend, and has a huge application market prospect. So far, there are not many research and application results on the technology of hot-dip galvanizing without ammonium chloride and the related reports are only in the test state. Among them, a us patent USP38604381131 and a Chinese patent CN135640A proposed to use salty metal fluoride and fluorosilicate as the main plating aid and add chloride, pointing out that it is used to prepare aluminum zinc alloy coatings in zinc aluminum alloy liquids with at least 25% and 5% aluminum content. However, the above method also has some disadvantages, such as the decomposition of ammonium chloride during zinc plating, the high cost of raw materials, the tendency of fluoride to corrode zinc tank, and its own toxicity and environmental pollution. The above research results are shown in industrial application examples and reports. According to technical proposal provided by the relevant patent plating aid by ammonium chloride, sodium chloride, nonionic surfactant and whole fluorine carbon door surfactant and its hot galvanizing technology is first assault stick again after oil removal, rust removal of ammonium and plating aid to help plating processing, its also quite harsh process conditions, provide the formula after replace sodium chloride with sodium chloride, after the glue layer of salt film on the surface of the steel is easy to get damp, causing secondary oxidation, surface derusting easily when they are in hot galvanizing "pitting" finish of consumption, and the production efficiency, is the effect is comparable to the ideal.

For this reason, a new plating aid is developed, which is suitable for batch hot dip galvanizing of steel parts. It is necessary to separate inspection and packaging, and it is also a technical problem that needs to be solved urgently.