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In fact, whether it is white corundum or brown corundum, both contain certain amounts of impurities after smelting, and the main components of these impurities are iron-containing oxides or magnetic substances. And how to remove these impurities is a problem that all manufacturers have to face. The main method currently used is magnetic separation. Magnetic separation relies primarily on the difference in magnetic strength among various magnetic materials, which causes them to follow different paths of movement, thereby allowing the removal of those materials that are ferrous or otherwise magnetic. Many people may then ask a question: since it has always been said that pickling is used to remove impurities, then under what circumstances is pickling used for white corundum? When acid washing of white corundum is required [http://www.mthml.com/hangyezhishi/197.html], we can assume that the customer is making a request similar to this: the iron content in the white corundum should be below a certain value, or as low as possible. This is because it indicates that the objects they process must not come into contact with iron ions, as contact will trigger a chemical reaction; that’s why such low levels of iron ions are required. Pickling primarily involves using acid to remove iron ions from corundum through chemical reactions, and indeed, the iron ion content in corundum after pickling is low. It should be noted, however, that pickling can easily cause environmental pollution; as a result, large-scale wastewater treatment equipment is required. Moreover, the acids used for pickling are not readily available, which is why the price of pickled white corundum is also high.