FIELD: precious metal technology. SUBSTANCE: invention relates to technology of collecting platinum-group metal-containing sludges from surfaces of equipment at production enterprises using platinum-group catalysts. Surfaces are treated with aqueous solution of ammonium chloride and/or hydrofluoride at ammonia- adjusted pH 3 to 9.5, better between 5 and 9, to separate sludge. EFFECT: increased degree of recovery of platinoids in absence of any significant corrosive effect on carbon steel. 2 cl, 1 tbl, 4 ex
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