2018-9-4 · Gold Leaching Process. When the grinding fineness -0.074mm content is more than 90%, the pulp concentration is 40%, the lime dosage is 3kg/t, the alkali pretreatment time is 2h, CNFREE gold environmental leaching reagent dosage is 600g/t, the leaching time is 24h, the gold leaching rate can reach 96.40% pared with cyanide leaching, the ...