METHOD FOR FLOTATION OF COAL Russian patent published in 1994 - IPC

FIELD: enrichment of useful minerals. SUBSTANCE: method involves conditioning coal together with collecting agent and with foaming agent followed by separation, fuel mass being isolated as foamed product. Solution which contains alkyldimethylbenzyl ammonium chloride having common formula R(CH₃)₂NCH₂C₆H₅Cl where R is mixture of alkyl residue C₁₀-C₁₈ is added during conditioning before collecting and foaming agent are added. Tractor kerosene is used as mentioned above collecting agent, vat residue of butyl alcohols production is used as mentioned above foaming agent. Ratio of mentioned above solution, collecting and foaming agents is 77.8:20.2:2.0-89.2: 9.6: 1.2 respectively. EFFECT: improves efficiency of the method. 4 tbl, 1 dwg