Steel/iron hydrochloric acid pickling plants

Environmental Management at Steel/Iron Hydrochloric Acid Pickling Plants... 

The optimum pad thickness increases with operating pressure and 3-6, 10-20, and 35-45 gauzes are used in atmospheric, intermediate, and high pressure plants. Pads must be carefiilly fitted to avoid tears or creases and laid flat on a support of high-chrome steel mesh (Figure 4.5). New gauzes are free of lubricants and iron contamination, but old uzes can also be reused provided that they contain no holes and have been carefully cleaned and reactivated. Dust and other contamination is carefully removed and the gauze pickled in hydrochloric acid to remove iron oxide scale. 

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