The invention discloses a method for restoring,
roasting, purifying, and extracting
manganese and iron by utilizing an electrolytic
manganese slag rotary kiln. The method comprises the following steps of: adding
manganese slag and
coal gangue slag into a
rotary kiln, wherein the adding quantity of the
coal gangue slag is 5-10%; carrying out high-temperature
roasting under a high-temperature environment inside the
rotary kiln and the condition of negative pressure, so that sulphur,
ammonia and
nitrogen compound is decomposed into gaseous state, feeding the gases into a multi-
pipe dedusting and
tail gas
treatment system to be removed along with the
smoke; and carrying out the
scavenging processes of ball-milling, first-stage low-intensity
magnetic separation, second-stage high-intensity
magnetic separation and third-stage high-intensity
magnetic separation on the material restored by high temperature of the rotary
kiln to obtain an iron product, a manganese product and a novel ultra-fine
quartz powder, wherein the iron product is obtained after first-stage low-intensity magnetic separation, the manganese product is obtained after the second-stage high-intensity magnetic separation and third-stage high-intensity magnetic separation, and the final tailing is the ultra-fine
quartz powder. The manganese and iron are extracted by the process disclosed by the invention; detrimental impurities are moved; the gas containing sulphur,
ammonia and
nitrogen is prepared into an
ammonium sulfate fertilizer; and the tailing is prepared into the superfine
powder as a
building material. The afterheat is utilized; the energy is saved, and the environment friendliness is achieved.