Lub luag haujlwm tseem ceeb ntawm cov neeg ua haujlwm kub leaching hauv heap leaching txheej txheem yog kom yaj cov tshuaj lom neeg (xws li, cyanide) kub hauv cov ore mus rau hauv ib qho chaw soluble, uas yog tom qab ntawd rov qab los ntawm adsorption lossis hloov chaw. Cov tsoos cyanide leaching yog qhov ua tau zoo (cov nqi rov qab feem ntau tshaj 80%) thiab kev lag luam tseem ceeb rau qib qis - qib ore (0.5-1.5 g / t). Txawm li cas los xij, nws qhov xwm txheej muaj kuab lom heev tuaj yeem ua rau dej thiab av, tsim kom muaj kev sib tw tailings neutralization thiab kaw -kwj dej. Cov tshuaj uas tsis yog-cyanide leaching agents (xws li thiourea thiab thiosulfate) yog ib puag ncig tus phooj ywg, tab sis tus nqi (thiourea yog 10 npaug ntau kim dua sodium cyanide), yuav tsum muaj cov tshuaj tiv thaiv hnyav (zoo li acidic ib puag ncig), thiab nthuav tawm qhov kev hloov pauv tseem ceeb hauv cov nqi rov qab (50% -85%).
Heap leaching txheej txheem yog hloov tau, tab sis yuav tsum tau tshwj xeeb ore permeability, particle loj (feem ntau crushed rau 10-50 mm), thiab kev nyab xeeb (zoo tshaj plaws nyob rau hauv arid cheeb tsam). Kev tshawb fawb tsis ntev los no tau tsom mus rau leaching tus neeg sawv cev txhim kho thev naus laus zis, xws li ntxiv leaching aids (peroxides) lossis bioleaching (siv microbial oxidation), txhawm rau txhim kho cov kub dissociation. Kev txhim kho yav tom ntej yuav tsum muaj kev sib npaug ntawm kev ua tau zoo, tus nqi, thiab kev tiv thaiv ib puag ncig, xws li kev txhawb nqa cyanide degradation technologies (xws li, H₂O₂ kho) lossis tsim cov txheej txheem leaching tshiab. Nyob rau theem txoj cai, kev txwv ntawm kev siv cyanide hauv ntau lub tebchaws (xws li EU REACH txoj cai) yuav tsav kev lag luam mus rau cov txheej txheem ntsuab.