FIELD: processes and equipment for extracting gold from concentrate containing gold and arsenic.
SUBSTANCE: method for extracting gold from ore concentrate containing gold and arsenic comprises steps of loading concentrate with added iron powder; setting temperature 100 -300°C in melting chamber and sustaining it for removing vapor and small amount of dust present in arsenic concentrate; at residual pressure equal to 50 Pa or less setting temperature 300 -500°C in melting and crystallization chambers and sustaining such temperature for removing evaporated arsenic sulfides; then sustaining temperature 300 -500°C in crystallization chamber and setting temperature 500- 600°C in melting chamber and sustaining temperature in those chambers for removing gaseous sulfur; setting temperature 600 - 760°C in melting chamber and sustaining it while simultaneously reducing temperature till 270 - 370°C in crystallization chamber; sustaining such temperature for crystallizing and producing arsenic. Then process is arrested, temperature is lowered, air is fed, gold enriched slag is separated after purifying it from arsenic and high-grade gold is extracted as usual. Equipment for performing the method includes induction heater, melting apparatus, crystallization apparatus with constant temperature, automatic hydraulic apparatus for removing slag, dust trap, automatic device for controlling temperature, evacuation degree measuring device, vacuum apparatus.
EFFECT: highly safe method for removing arsenic from ore concentrate containing gold and arsenic absolutely without contamination of environment.
31 cl, 3 dwg, 5 tbl, 11 ex
