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Antimony, a toxic metalloid similar to arsenic, is present at variable levels in most gold-bearing rocks. Antimony is soluble
in the surface environment, so antimony (Sb) mobilization in mine waters is an environmental issue around gold mines. The
Reefton gold mine was originally developed in gold-bearing quartz veins; Sb concentrations were low (<100 mg/kg) compared
to arsenic (As) concentrations (>1,000 mg/kg), and the mine waters had low dissolved Sb (<0.1 mg/L). A second stage of gold
mineralization at Reefton involved brecciation and cataclasis of quartz veins and wall rocks, with addition of stibnite (Sb2S3). Processing of this ore has resulted in higher dissolved Sb in mine waters (0.1–1 mg/L), even after water treatment that
removes most dissolved As (to 0.01 mg/L) by adsorption to suspended iron oxyhydroxide. Competition between As and Sb for adsorption
sites on iron oxyhydroxide particles may have resulted in partial exclusion of the more weakly adsorbed Sb. The high rainfall
(2,000 mm/year) at Reefton ensures adequate dilution of mine waters after discharge. The Macraes gold mine has no stibnite,
and most Sb is in solid solution in the abundant arsenopyrite (Sb up to 2,000 mg/kg). Pit waters have both Sb and As dissolved
up to 0.1 mg/L, partly because of evaporative concentration in a low-rainfall environment. Macraes tailings waters have high
As (up to 3 mg/L) but negligible Sb (<0.001 mg/L). Reefton mine gold-bearing concentrate, containing stibnite, is transported
700 km to be processed by autoclave oxidation and cyanidation at the Macraes mine. This introduction of additional Sb to the
Macraes site substantially increases the Sb content of the process stream periodically. Tailings from this process have up
to 3 wt% Sb, dispersed through As-rich iron oxyhydroxides that are formed in the autoclave. The Sb-rich tailings are strongly
diluted (approximately 100:1) by the Macraes tailings, and adsorption of Sb to iron oxyhydroxides in the tailings piles ensures
that there has been no increase in the Sb content of the tailings water since the Reefton concentrate has been added at Macraes. 相似文献
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丫他微细粒浸染型金矿石嵌布粒度细微,以包裹金为主,给选别造成严重困难.通过采用两段磨矿溢流控制分级、不脱泥强化浮选、一次粗选三次扫选四次精选的磨浮流程,扩大试验得到品位38.00 g/t、回收率86.8%的较好指标,为矿山建设提供了依据. 相似文献
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The results are presented for using microorganisms for mercury and antimony separation and extraction of oxidized antimony minerals. The problems on technology of direct processing of gold-antimony concentrates by pentachlorous antimony chlorides are considered. The perspective is shown for leaching antimony by alkaline solution of sulfate-reducing bacteria. The transformation of antimony sulfide into commodity concentrate of antimony trioxide by Thiobacillus ferrooxidans is demonstrated. 相似文献
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为了给某难处理金矿石的开发提供技术依据,对其进行了详尽的选冶工艺试验研究。结果表明:采用单一浮选工艺处理该矿石,在-200目占80%的磨矿细度下,可以获得金品位为57.32 g/t、金回收率为84.00%的金精矿;采用浮选-尾矿氰化浸出工艺处理该矿石,可以先在-200目占70%的磨矿细度下获得金品位为60.09 g/t、金回收率为82.26%金精矿,然后在-200目占90%的再磨细度下获得金浸出率为10.70%的浸出液,金的总回收率达92.96%。根据试验结果,推荐采用浮选-尾矿氰化浸出工艺。 相似文献
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难处理金矿石选冶技术研究 总被引:1,自引:0,他引:1
甘肃某金矿金矿品位较低,矿石氧化程度较高。金矿物粒度细小,主要以微粒、次显微金矿物形式嵌布于褐铁矿粒间以及被粘土矿物充填的褐铁矿裂隙、孔洞中,属于难处理矿石。根据该矿石性质进行了原矿全泥氰化浸金和浮选富集-氰化浸金两种工艺流程的试验研究,结果表明该两种工艺均可获得较好的选矿指标:原矿全泥氰化搅拌浸出的金浸出率为94.19%;浮选富集-氰化浸金的金浸出率为97.62%,银浸出率为90.80%。由于浮选抛尾可显著提高氰化浸金的设备效率和经济效益,故推荐浮选富集-氰化浸金为该金矿的选冶技术方案。 相似文献
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对河南某含碲金矿石进行了尼尔森重选单因素试验和重选尾矿再浮选试验。在磨矿细度-0.074 mm粒级占60%、给矿浓度25%、离心力强度50g、给矿速度900 g/min条件下获得重选精矿,在磨矿细度-0.074 mm粒级占70%、矿浆pH值为8、捕收剂异戊基黄药用量120 g/t条件下对重选尾矿进行一粗一扫浮选,重选和浮选的合并精矿金、银、碲品位分别为32.88 g/t、39.94 g/t和94.35 g/t,金、银、碲总回收率达到了89.97%、86.48%和81.29%,实现了金、银、碲的有效回收。 相似文献
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内蒙古某低品位铜铅锌矿石中金银回收工艺研究 总被引:2,自引:0,他引:2
在对内蒙古某低品位铜铅锌矿石工艺矿物学研究的基础上,结合矿石中主要有价组分--金银的计价结算体系,确立了将金银富集到铜铅精矿中的流程思路,进行了铜铅混合浮选、后选锌、再铜铅分离流程的工艺技术条件研究,采用试验确定的磨矿、1粗2扫1精铜铅混浮、磨矿、2次混合精选、1粗1扫1精铜铅分离、1粗2扫4精浮锌、中矿顺序返回闭路流程,可以获得金回收率达85.92%、银回收率达50.99%的铜精矿和金回收率达5.50%、银回收率达17.49%的铅精矿,金总回收率高达91.42%、银总回收率高达68.48%。 相似文献
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Jewiss Carrie Craw Dave Pope James Christenson Hana Trumm Dave 《Mine Water and the Environment》2020,39(1):27-41
Mine Water and the Environment - In much of the world, seasonal weather patterns cause a flush of dissolved contaminants from mined areas at the beginning of wet seasons. However, on parts of New... 相似文献
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河南某难处理金矿石选冶工艺对比研究 总被引:1,自引:1,他引:0
针对河南某难处理金矿石品位低、黄铁矿含量高、部分载金硫化物氧化严重,以及金嵌布粒度极细的特点,开展了详尽的浮选及全泥氰化浸出试验。试验结果表明:采用浮选工艺,所得精矿的金品位和金回收率仅为18.72 g/t和72.55%;而采用全泥氰化浸出工艺,在磨矿细度为-0.074 mm占90%,矿浆液固比为2∶1,加石灰调浆5 h使矿浆pH值稳定在11.5左右,氰化钠用量为1 kg/t,氰化浸出时间为72 h的条件下,金的浸出率可达81.11%。因此,推荐采用全泥氰化浸出工艺处理该矿石。 相似文献