Acid cleaning and pickling baths

It is normal, in non-automated acid cleaning and pickling baths, for there to be no filtration of the solutions, the solid contaminants being allowed to settle out of suspension. Batch filtration can, however, substantially improve acids life and simplify waste treatment. A typical array of equipment used for pickling solution recycling is shown in Figure 4.35, similar to most of the solution treatment processes described in this Section.

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