Method of detoxifying asbestos contained in waste slate and detoxified asbestos obtained through the same

摘要

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.

主权项

1. A method of detoxifying asbestos of waste slate, the method comprising:
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 to form a magnesium oxalate (MgC2O4) having a rhombohedral or amorphous shape, wherein a mixing ratio (g/cc) of the waste slate powder to the hydrochloric acid aqueous solution is in a range of 1:8 to 1:10 based on 5% hydrochloric acid aqueous solution, wherein a mixing ratio (g/cc) of the concentrated asbestos to the oxalic acid is in a range of 0.8:0.5 to 1, and wherein the low-temperature heat treatment is performed at 100° C.