Prospects the development of purification methods of sludge-lignin deposits of JSC “Baikal Pulp Mill” with polymer electrolytes
Abstract
The work analyzes the sludge sediments of the filler cards of the Baikal Pulp Mill (BCC) for the content of metal salts accumulated both as a result of the production activities of the BCC and the discharge of ash waste from heating plants and household wastes. The dependence of the content of metal salts on the concentration of sulfur-containing compounds, the acidity of the medium and the content of hardness salts has been established. The effectiveness of the interaction of polymer coagulants/flocculants based on quaternary ammonium compounds (Q+X‒) with inorganic metal salts of composition 1:2 (MeX2) in a wide range of acidity from strongly alkaline to strongly acidic environments has been studied. It has been shown that, depending on the nature of the metal, predominantly double salts (Q+Cl‒)2·MeCl2 or complex compounds of the Q+2[MeCl4]‒2 type are formed in acidic chloride media; in the case of Cd salts, the formation of complex polyanions is possible. In alkaline media, the polyelectrolyte is strongly adsorbed on the surface of solid metal hydroxides and hydroxychlorides, which leads to the polymer effect of enlarging particle sizes via a bridging mechanism. The established type of interaction makes it possible to develop effective methods for purifying KN sludge from metal salts whose concentrations exceed the MPC values (Pb, Cd, Ni). using polyelectrolytes based on quaternary ammonium salts.
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