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Arch Dust Suppression Handbook <br />3. Crushers. Depending on the type of crusher and the material being crushed, the enclosure <br />size will vary. In general, a rock box or vault under the crusher with substantial empty volume is <br />desirable. If no vault is provided, the receiving belt must be tightly skirted. The belt covers at <br />least twice the size of a typical transfer point, and special skirting is preferred in the impact zone <br />enclosing the belt. The mouth of the crusher should be protected in some way from wind so the <br />belt, chute, or feeder supplying the crusher is "enclosed" with the crusher. A wind screen is <br />generally sufficient. <br />4. Dump pockets and hoppers. Depending on the type of vehicles feeding a dump pocket or <br />hopper; the mass flow through them; the nature of the material; operating procedures; aid <br />ambient conditions; enclosures for this application require custom designs. In some cases, <br />walls on three sides extending six feet or more above the maximum level of the material is all <br />that is required. In other cases, a building with large dimensions and flexible or removable walls <br />may be necessary. Each case will require individual design and fabrication. <br />Many times the top of a hopper is much larger than necessary and can be covered with a solid <br />sheet of material or tarp fabric similar to that used for dump trucks. Surround the point with wind <br />fence material as much as possible to reduce the influence of ambient winds on the fog filter. <br />Try to control the flow direction of the displaced air that carries the dust so that is stays within the <br />enclosure. This requires some creativity but the principal is simple. Baffles or turning veins are <br />often helpful. <br />CONCLUSION <br />Agglomerative dust control systems like ARCH Fogger Systems are an effective solution to <br />most fugitive emission problems. They are installed in numerous mining and bulk material <br />handling applications in the U.S. and the technology is widely used in other areas of the world. <br />They are considered 'SACT" (best available control technology) in many regions and are well <br />liked by both users and regulatory agencies. Care should be taken to design the systems for <br />severe climates and use requirements. <br />Considering the benefits; with no ongoing costs related to chemical use; and minimum effect on <br />downstream processes associated with the product; the ARCH Fogger System is the system <br />of choice. Agglomerative dust systems require a minimum of maintenance \ housekeeping and <br />power requirements are low in comparison to other 'SACT' technologies. When combined with <br />other fugitive dust control technologies such as road stabilization and windscreens, <br />agglomerative dust systems becomes an integral and important part of a total dust control <br />strategy. <br />How to Identify Agglomerative Dust Suppression Applications <br />MINING - All stages of crushing and screening, truck dumps, storage bins, reclaim <br />feeders, and rail car loading and unloading. <br />is Page 6 <br />