METHOD OF OBTAINING SILVER-CONTAINING CONCENTRATE (VERSIONS) Russian patent published in 2008 - IPC C02F1/50 A61L2/18 C02F103/02 

FIELD: chemistry.

SUBSTANCE: obtaining silver-containing concentrate includes electrolytic dissolving of metallic silver on anode with obtaining ions of single-valent silver (Ag⁺) 0.5·10^-2-0.1 wt %. Electrolysis is carried out with voltage 2V in composition of organic acid and distilled water. After electrolysis hydrogen peroxide in amount 0.6-30.0 wt % and functional additives are added to it. As organic acid carboxylic bibasic acid in amount 0.013-0.062 wt % is used. Before introduction of hydrogen peroxide into electrolyte functional additives are added. According to first version as functional additives orthophosphoric acid 85% to pH=3,5-4.5±0.5 in amount 0.01-0.1 wt % is used. According to second version: orthophosphoric acid 85% to pH=3,5-4.5±0.5 in amount 0.01-0.1 wt % is used with further addition of 0-5.0 wt % of sulfoxide. According to third version: 0-10.0 wt % of polyethylene glycol (PEG) with molecular weight 400-1500 or 1,4-twice-substituted dioxanone. According to fourth version: PEG with molecular weight 400 - 1500 or 1,4-twice-substituted dioxanone with further addition of 0-5.0 wt % of sulfoxide. In all versions water is the remaining part.

EFFECT: increase of rate of silver-containing concentrate penetrating ability into surfaces and membranes of bacterial cells.

16 cl, 1 dwg, 8 ex