FIELD: electrical engineering. SUBSTANCE: upon impregnation with nickel and alkali salt solutions, sintered porous bases are rinsed in condensate and repeatedly used by organizing closed-circuit water and alkali circulation. Post-rinsing water is clarified in sediment bowl, cleaned of nickel hydroxide by passing it through ultrafiltration unit, neutralized by acid to pH = 6.5-7.5, and demineralized in back-osmosis unit. Alkali is clarified in sediment bowl, reconditioned by barium hydroxide solution, filtered, and brought to desired concentration. EFFECT: improved environmental friendliness due to reuse of water and alkali in process. 2 dwg, 3 tbl, 2 ex
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