Patent ID: 9446273
Filing Date: 2016-09-20
CPC Classification: A62D,B09B

Claim Text:
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 (MgC 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.