Float sorting device for selective separation of non-metallic minerals

A multi-stage float sorting device, comprising:

• a first flotator float-sorting ores mixed with water based on a difference in density;
• and
• a second flotator, provided with a column extending in a top-down direction, one side of which directly connected with the first flotator to receive primary concentrates, float-sorting the primary concentrates based on a difference in density to obtain secondary concentrates,
• wherein the second flotator comprises:
• a washing water jetting section provided at a top of the column to jet washing water so as to separate impurity minerals from the primary concentrates;
• a gas sparger provided at a bottom of the column to jet an inert gas so as to generate bubbles;
• and
• an opening and closing section located between the washing water jetting section and the gas sparger to partition an inside of the column into upper and lower regions, and form an opening so as to allow the secondary concentrates accommodated in the column to rise when the pressure of the lower region exceeds a set value as the inert gas is supplied, and
• wherein the opening and closing section comprises:
• a first opening and closing section provided to divide the column into a first region formed at the top of the column and a second region formed at the bottom of the column;
• and
• a second opening and closing section provided to divide the second region into a third region formed at a top of the second region and a fourth region formed at a bottom of the second region.