Method of detoxifying asbestos contained in waste slate and detoxified asbestos obtained through the same
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United States of America Patent
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Sep 20, 2016
Grant Date -
Dec 25, 2014
app pub date -
Jun 19, 2014
filing date -
Jun 25, 2013
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Abstract
Disclosed is a method of detoxifying asbestos of waste slate. The method includes concentrating the asbestos by introducing hydrochloric acid aqueous solution into waste slate powder to dissolve and remove a limestone component contained in the waste slate; and mixing the concentrated asbestos with oxalic acid and performing a low-temperature heat treatment. The waste slate is crushed and pulverized and powder of the crushed and pulverized waste slate is formed in a size in a range of 100 meshes to 300 meshes. The detoxified asbestos includes re-crystallized magnesium oxalate having a rhombohedral or amorphous shape.
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