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We discuss a new generic optimal controller structure for raw material blending in the cement industry. We focus on an important phase of the proportioning-burning-grinding operation triplet that essentially determines the cement quality; namely, the composition control of the raw mill system. We begin by describing the application of a generic optimal controller structure to this important phase, followed by a discussion of the control engineering background and the design of the realized controller. Finally, the control algorithm is discussed in a technology-independent manner.