It also assists in removing scale-forming substances owing to the enormous surface area exposed in the precoat, so that pressure build-up in the subsequent precipitate filters from these substances is reduced. The precoat when properly used prevents penetration of fine slimes into the filter fabric and thereby extends the useful life of the filter cover. Precoating of the filter cloths with diatomaceous earth “filter aids” has been found to improve the clarification operation and to increase the useful life of the filter covers. In starting a new or recently cleaned filter unit, irrespective of type, the effluent should be returned, for a few minutes at least, to the unclarified storage.Ĭlose attention to these points will ensure a lower tail solution, less consumption of precipitant, and much more satisfactory melting and refining. If canvas is the filter medium, either under pressure or under vacuum, it should be stitched around the periphery of the leaf, and the stitched area painted with “P” and “B” or a similar paint. With proper skill and attention it is possible to obtain such clarification with gravity sand filters, with plate-and-frame pressure filters, or even with vacuum-leaf filters. One of the most important advantages of proper clarification is the avoidance of undue pressure build-up in the precipitate filters. Regardless of color, the solution must be bright and sparkling and entirely free from colloidal solids. The first essential to in any methods for effective Gold Precipitation is clear solution.
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