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首页> 外文会议>International Symposium on Electrochemistry in Mineral and Metal Processing Ⅴ, May 14-18, 2000, Toronto, Canada >RECOVERY OF GOLD FROM PYRITE(FeS_2)BY AQUEOUS CHLORINATION II. REDUCTION OF AQUEOUS CHLORINE ON PYRITE(FeS_2)
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RECOVERY OF GOLD FROM PYRITE(FeS_2)BY AQUEOUS CHLORINATION II. REDUCTION OF AQUEOUS CHLORINE ON PYRITE(FeS_2)

机译：水氯化法从黄铁矿（FeS_2）中回收金II。黄铁矿（FeS_2）上氯的还原

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摘要

The reduction kinetics of aqueous chlorine species on a pyrite (FeS_2) rotating disc electrode were studied at pH 2 and 4, within which range the predominant chlorine species change from aqueous chlorine to chloric(I) acid (HOCl), and Fe(Ⅲ) solubility decreases greatly. Aqueous chlorine reduction at potentials < 0.6 V (SCE) and pH 2 was affected only slightly by potential cycling over the range +-1.0 V (SCE), deviation from Levich's equation for transport controlled current densities at < 0.5 V (SCE) being greatest at low rotation rates. Reduction of chloric(I) acid at pH 4 at < 0.7 V (SCE) was greatly affected by a prior excursion to +1.0 V vs. S.C.E., the current on the negative-going potential sweep decreasing by ca. 40 % compared with that on the positive-going sweep. This behaviour was attributed to the formation of a relatively adherent surface layer, probably of iron (hydr-)oxide and sulfate phases.
机译：在pH 2和4下，研究了黄铁矿（FeS_2）转盘电极上氯离子的还原动力学，在此范围内，主要氯离子从氯离子变为氯酸（I）（HOCl）和铁（Ⅲ）。溶解度大大降低。电位<0.6 V（SCE）和pH 2时，氯水溶液的还原仅受到+ -1.0 V（SCE）范围内的电位循环的轻微影响，对于小于0.5 V（SCE）的传输控制电流密度，与Levich方程的偏差最大在低转速下。相对于S.C.E.，事先偏移到+1.0 V时，在pH值小于0.7 V（SCE）时pH（4）下的氯酸（I）的还原受到很大影响，负向电势扫描上的电流减少了约0.2 V.与积极打扫相比，减少了40％。该行为归因于形成了相对粘附的表面层，该表面层可能是铁（氢氧化物）和硫酸盐相。

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