Up-to-date methods and technologies for improving the performance of foam separation of diamond-bearing kimberlites

The mechanism of stable hydrophobization of diamonds by asphaltene-resin cut fraction of fuel oils used as collectors for foam separation was considered. The use of special additives to collectors providing their active and strong fixation on a diamond surface was substantiated. It was proposed to use combined modes of ore and recycled water conditioning by acoustic, thermal, and reagent methods to restore the natural hydrophobicity of diamonds to increase their floatability. A technological mode of foam separation was developed, including thermal treatment of an initial diamond-containing product and maintenance of the required temperature in the conditioning with a collector, foam separation, and flotation. The developed reagents and modes were tested at a foam separation unit. The test results showed an increase in diamond recovery over a wide range of temperatures.