Apparatus for manufacturing single crystal silicon ingot having reusable dual crucible for silicon melting

An apparatus for manufacturing a single crystal silicon ingot, the apparatus comprising:

• a dual crucible configured to melt raw silicon charged into the dual crucible;
• a crucible heater configured to heat the dual crucible to melt the raw silicon into molten silicon;
• a crucible drive unit configured to control rotation and elevation of the dual crucible;
• and
• a pull-up drive unit disposed above the dual crucible, and configured to
• pull up a seed crystal dipped in the molten silicon, and
• produce a silicon ingot from the seed crystal,
• wherein the dual crucible has a container shape which is open at an upper side thereof, and comprises:
• a graphite crucible having a lower wall, an upper wall and an inclined surface connecting the lower wall;
• and
• a quartz crucible inserted into the graphite crucible, and configured to receive the raw silicon charged into the dual crucible,
• wherein the graphite crucible comprises a discharge port formed through the lower wall thereof.