Bleach Plant Materials Selection, 2023 PEERS Conference

The paper is a practical review of materials selection in the bleach plant. It briefly covers oxygen delignification, and the alkaline extraction and chlorine dioxide stages along with acids used for pH control. The focus is on metals though for chlorine dioxide bleaching, non-metals are an important consideration. Bleach plant corrosivity varies by mill and even over time within a single mill depending on process changes. For any significant process change or new equipment installation it is advisable to carry out corrosion testing in advance to ensure materials with sufficient resistance are selected. As an example, results of several field coupon tests are presented and show that duplex stainless steels are a good choice for a variety of bleach plant environments including low residual chlorine dioxide solutions.

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