Natural stone grinder

Horizontal ball mills have dominated as the equipment of choice for limestone grinding functions within wet flue gas desulfurization (WFGD) systems. Recent years have led to a more wide spread investigation and acceptance of alternative mill system designs. Mill types considered within the industry have ranged from a variety of media mills to dry roller mills.

The science and application of size reduction processes is a complex subject. Similarly, the design of the FGD system is also complex and can be influenced by many factors. Determining the most cost effective and energy efficient grinding method for each application can require an exhausting study. The detailing of optional designs with significant capital cost, power and operational information is time consuming to produce and evaluate.

Presented is a review of limestone grinding for FGD systems, with an attrition mill option exemplifying how advancements in comminution processes influence overall FGD system design. Relative grinding energy efficiencies are presented to assess the impact of operational power consumption and installed power. The goal is to shed light on overall objectives and design path alternatives.

In the United States alone, an estimated 32 billion kWh of power are consumed by size reduction equipment. A large percentage of that power is for fine grinding applications. When fine grinding in a tumbling mill, the production of unwanted noise and heat waste valuable energy. The VERTIMILLTM, a stirred media mill, is an energy efficient alternative to a tumbling type mill for fine grinding applications. The VERTIMILLTM can be used for wet or dry grinding. This brochure describes wet grinding in the VERTIMILLTM.

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