Anordning vid flotationsapparat

摘要

A flotation apparatus contains a lower portion of pulp and an upper portion of froth which drains over an upper horizontal edge of the apparatus. When the ore contains lead and zinc, lead contaminated with zinc will drain off. The object of the invention is to increase the lead content in the froth drained off. This is achieved by allowing the froth to drain upwardly through a channel, preferably one having rectangular cross section and having an angle of inclination less than 90 DEG to the surface of the froth. The froth is also spayed before it leaves the channel, with at least one jet of water directed towards the part of the channel wall located furthest away in relation to the drainage edge of the channel.