FILTRATION AND PURIFICATION OF PLATING AND RELATED SOLUTIONS AND EFFLUENTS

摘要

This introduction reflects the response needed by platers for quality control, to meet just-in-time deliveries, and to achieve zero rejects. It also addresses the need for platers to continue to reduce solid waste after neutralization and employ filtration wherever possible to recycle or lengthen the service life of cleaners, etchants, and rinses. Filtration usually includes the use of carbon for undesirable organic impurity removal, which years ago also doubled as a filter media along with other forms of filter aids. Today's acceptance of granular carbon in many situations has lessened the need for powdered carbon and almost eliminated the weekly or monthly batch purification treatment. There are, however, some occasions when powdered carbon may be the only answer, and for that reason a separate piece of equipment held aside for such a need should be considered. Platers who appreciate the value of filtration must first understand that it is not as much an art as it is a science. The requirement of a science is to have an orderly body of facts, facts that can be correlated and anticipated results yielded. Although there has been some work done in this area over the last 5-10 years, platers must still rely on experience to a great extent.