Leaching chalcopyrite with sodium chlorate in hydrochloric acid solution

A Hybrid Mineral Battery: Energy Storage and Dissolution Behavior of CuFeS2 in a Fixed Bed Flow Cell

“…However,s eriouse nvironmental issues with smelting, depletion of high grade ores and al arge amount of impurities (some toxic) have resulted in continued research for the developmento fhydrometallurgical technologies. The nature of this inhibition (and the passive film that may be responsible) is still controversial and anumber of studies describe it as elemental S 0 , [17,18] disulfide (S 2 2À ), [19][20][21] metal-deficient polysulfides (S n 2À )a nd/or Fe hydroxy-oxide. [14] The stabilityo fC uFeS 2 in aqueous solutionsa nd its tendency to form other phases in oxidizing, reducing, acidic and basic conditions can be explained with an E H -pH( Pourbaix) diagram.…”

“…[15,16] During acidic oxidative leaching processes, CuFeS 2 dissolution is inhibited and this is believed to be one of the main reasons for its slow kinetic response. The nature of this inhibition (and the passive film that may be responsible) is still controversial and anumber of studies describe it as elemental S 0 , [17,18] disulfide (S 2 2À ), [19][20][21] metal-deficient polysulfides (S n 2À )a nd/or Fe hydroxy-oxide. [22,23] However,t he monosulfide (S 2À ), disulfide (S 2 2À ), polysulfide (S n 2À ), Cu 1Àx Fe 1Ày S 2 (x + y % 1a nd y @ x), irondeficient sulfide, and CuS n (n > 2) species have been detected within the surface film anda re well documented in the literature.…”

Statistical evaluation of an electrochemical probe for the detection of chlorate

“…Fortunately, significant efforts and progress have been made to address this concern. For example, rather than detect chlorate directly, Wen and coworkers [36] utilize it to selectively oxidize chalcopyrite (i.e., CuFeS 2 ) and electrochemically detect the Cu(II) and Fe(III) released. Similar strategies have been demonstrated using sphalerite (i.e., ZnS 2 , producing Zn(II)) [37] and galena (i.e., PbS, producing Pb(II)) [38] as the metal ion sources.…”

Sustainable rehabilitation of mining waste and acid mine drainage using geochemistry, mine type, mineralogy, texture, ore extraction and climate knowledge

“…The electrochemical oxidation of chalcopyrite generated insoluble sulfur species (e.g., S , S n 2À , etc.) forming a passivation layer on the mineral surface and decreasing the dissolution kinetics (Xian et al, 2012;Klekovkina et al, 2014). But they facilitated attachment of Fe and S-oxidizing microorganisms on mineral surface (Lara et al, 2013) and prevented such effect through biooxidation of reduced sulfur species (Anjum et al, 2012).…”