![]() ![]() The unwanted or gangue particles are unaffected and remain in the pulp. Air is then bubbled through this pulp contained in a cell or tank and, following the addition of various chemicals and proper agitation, the required mineral particles become attached to the air bubbles and are carried to the surface to form a stable mineral-containing froth which is skimmed off. The ore is first processed to a fine suspension in water by grinding in ball or rod mills - preferably to a particle size of < 0.25 mm. The most common separation technique is selective froth flotation. Lead and zinc ores often occur together and, in most extraction methods, have to be separated. ![]() Other important ores such as cerussite (lead carbonate) and anglesite (lead sulfate) may be regarded as weathered products of galena and are usually found nearer to the surface of the earth's crust. The most important lead ore is galena (lead sulfide). ![]()
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