| 摘要 |
PCT No. PCT/SU79/00063 Sec. 371 Date Mar. 31, 1981 Sec. 102(e) Date Nov. 24, 1980 PCT Filed Jul. 31, 1979 PCT Pub. No. WO81/00418 PCT Pub. Date Feb. 19, 1981.A method comprises heating the material to be treated without access of air at a temperature of 700 DEG to 800 DEG C. for a period of 1-2 hours, and then subjecting this material to subsequent magnetic separation. It is advisable that the furnace walls surrounding the material under treatment be heated to a temperature which is 100 DEG C. to 200 DEG C. higher than the boiling temperature of the volatile components of the material. Upon completion of the heating operation, the material being treated is cooled at a rate of 2 to 4 deg. per minute, whereafter iron sulphides are removed therefrom by means of magnetic separation, the intensity of magnetic field ranging from 1000 to 2000 oersted, and then copper sulphides are separated, with the field intensity ranging from 4500 to 6000 oersted. |
