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The mineralogical characterization of antimony-bearing refractory gold concentrates and the antimony extraction by ozone in HCl solution were investigated. The mineralogical study shows that there exist stibnite(Sb2S3), arsenopyrite(FeAsS), pyrite(FeS2) and quartz in the concentrates, and the gold is mainly (67.42%) encapsulated in sulfides. The antimony extraction by ozone in hydrochloric acid was employed and the influences of temperature, liquid/solid ratio, HCl concentration and stirring speed on the extraction of antimony were investigated. High antimony extraction (93.75%) is achieved under the optimized conditions. After the pretreatment by ozone, the antimony is recovered efficiently and the gold is enriched in the leaching residue. 相似文献
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以难冶金精矿烟尘为原料,研究了氢氧化钠浸出、硫酸浸出以及硫酸与氢氧化钠联合浸出对烟尘中砷、铁和碳脱除及氰化浸金的影响。结果表明:在氢氧化钠浓度为6mol/L时,砷、碳脱除率分别为99.66%和60.63%,金浸出率为58.90%,较直接氰化浸出仅提高4.60%,砷的有效去除不能有效提高金的浸出率。在硫酸质量分数为15%时,铁、砷和碳脱除率分别为33.65%、80.38%和12.59%,金的浸出率为80.40%,与氢氧化钠浸出相比,硫酸浸出解离铁能有效提高金的浸出率。烟尘分别经过质量分数为15%硫酸浸出后氰化浸金,两次2 mol/L氢氧化钠浸出和氰化浸金后,烟尘中铁、砷和碳的总脱除率分别为33.65%、95.63%和79.60%,渣率为80.33%。此时,金的总浸出率为91.90%,氰化渣中金的含量为3.31g/t。与烟尘直接氰化浸出相比金的浸出率提高37.60%。 相似文献
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1 INTRODUCTIONCyanidationprocess ,characterizedbyeffectivenessandlowoperatingcost,asaconventionaltechnologyforgoldextractionfromores ,hasbeenusedinindustryforover 10 0years .Howeverthecyanideisahighlytoxicchemical,andcommercialcyanidationprocessislimitedint… 相似文献
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采用对比方法研究难冶金精矿焙砂和烟尘氰化浸金的差异。结果表明,直接氰化时焙砂和烟尘中金的浸出率分别为85.31%和54.30%。砷、碳含量及其存在形式是导致两者金浸出率差异的主要原因。对于NaOH预处理后氰化浸金,焙砂和烟尘中金的最大浸出率分别为87.70%和58.60%。有害元素的脱除、碱浸预处理过程中金的损失及铁氧化物的阻碍共同决定碱浸预处理后焙砂和烟尘中金的浸出率。经H2SO4预处理后,焙砂和烟尘中金的最大浸出率分别达到94.96%和80.40%。碳质物的影响是焙砂和烟尘中金浸出率差异的主要原因。基于这些差异,提出两种适宜工艺,焙砂和烟尘中金的浸出率分别达到94.91%和91.90%。 相似文献
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孟宇群 《中国有色金属学会会刊》2005,15(5):1178-1184
A new hydrometallurgical process for a carbonaceous refractory gold concentrate at ambient temperature and pressure was presented, including grinding-leaching, intensified alkaline leaching(IAL), thiosulfate leaching and cementation by zinc powder. The experimental results show that the grinding-leaching and intensified alkaline leaching process result in the selective oxidation of arsenopyrite and pyrite. The oxidation ratio of As is 96.6%, and 46.7 % for S. The total consumption of NaOH in alkaline leaching is only 28 % of that theoretically calculated under the conditions of full oxidization for the same amount of arsenopyrite and pyrite transforming into arsenates and sulfates, and 83.6% of gold is synchro-dissoluted by thiosulfate self-generated during pretreatment. Since the carbonaceous matter in concentrate possesses a strong capability of preg robbing, the cyanidation process is not suitable for the extraction of gold after pretreatment. However, the gold leaching rate by thiosulfate leaching for 24 h is increased to 91.7% from 0 - 3.2% by ultra-fine grinding without the pretreatment. The recovery of gold by zinc cementation gets to 99.6%. Due to the thiosulfate self-generated during alkaline leaching, the reagent addition in thiosulfate leaching afterwards is lower than the normal one. 相似文献
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采用响应曲面法(RSM)优化NaClO浸出贵州难浸金矿中的金,探究了Na ClO浓度、温度、液固比、p H值4个因素之间的交互作用及其对金浸金率的影响,并进行了参数优化。RSM分析表明,各因素对金浸出率的显著程度为:NaClO浓度>液固比>p H>温度,NaClO浓度和p H之间的交互作用较为显著;得到较优的浸金工艺条件为:反应时间3 h,Na ClO浓度0.9 mol/L,初始pH=13.4,液固比8.2,温度27℃,在此条件下金的浸出率为93.4%。 相似文献
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含铜金矿的压力氧化浸出及其机理 总被引:4,自引:1,他引:4
含铜金矿在氧气分压为o.45 MPa、温度约为110℃条件下于高压釜中氧化一定时间,浸出铜后,渣氰化浸金,获得的铜、金浸出率分别为90.3%和96.55%.通过分析X射线衍射谱及CuFeS2-H2SO4-NaCl-H2O体系在25℃下的ψ-pH图,确定了载金矿物的氧化机理,分析了浸出体系的酸度、温度及氯化钠浓度对含铜金矿预氧化及浸出过程的影响规律.结果表明:硫化矿的氧化溶解首先是磁黄铁矿,其次是铜的次生硫化矿,再次是黄铜矿,最后是黄铁矿;载金黄铜矿的氧化首先是铁从黄铜矿的晶格中氧化溶解出来,生成中间产物CuS2和CuS;较高的酸度和氯化钠浓度有利于单质硫的生成、三价铁的水解和铜的浸出,进而有利于金浸出率的提高. 相似文献
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采用碘-碘化物浸出体系,从碘初始含量、碘与碘化物摩尔比和浸出液pH值3个影响因素入手,考察不同碘化物(碘化铵、碘化钾和碘化氢)对金精矿碘化浸出过程的影响。结果表明:在碘初始含量为1%,碘与碘化物摩尔比为1:8,浸出液pH值为7,液固比为4:1,搅拌速度为600 r/min,浸出时间为4 h,温度为25℃的条件下,用碘化铵或碘化钾作为碘化浸金的络合剂,金的浸出率均能达到90%左右,而用碘化氢(其水溶液为氢碘酸)作络合剂时,金的浸出率仅有75%。考虑到不同碘化物浸金效果差异及工业应用的可行性等因素,确定碘化钾为适宜的金精矿碘化浸出络合剂。 相似文献
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以广西某极难浸石煤钒矿为研究对象,研究循环流态化焙烧试样在加压浸出条件下的钒浸出率。结果表明:在相同酸浸条件下,循环流态化空白焙烧试样的钒浸出率高于钠化焙烧的钒浸出率。系统的焙烧浸出工艺对比研究表明:该石煤钒矿只有在循环流态化焙烧并加压高浓度酸浸作用下才能获得最高的钒浸出率,应属于极难浸石煤钒矿。在V(H2SO4):V(HF)=1:1和MnO2添加量(质量分数)为3%的条件下,循环流态化空白焙烧矿的最佳酸浸条件为液固比1:1、浸出温度150℃、浸出时间6 h,钒浸出率可达98.11%。同时,研究循环流态化空白焙烧矿加压浸出的动力学模型、浸出控制步骤及表观活化能。循环流态化空白焙烧能避免钠化焙烧产生的Cl2及HCl等有害气体的排放问题。从焙烧反应设备的创新应用着手,探索试验工艺条件,为极难浸石煤钒矿的工业化利用提供参考和依据。 相似文献
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采用"磁化焙烧-硫脲浸金-磁选-碱浸除杂"的金铁梯级提取法从焙烧氰化尾渣中浸出金,并制取铁精粉,通过物相转化、焙烧过程热力学计算和颗粒群结构分析,揭示铁精粉中杂质形成机理。结果表明:氰化尾渣添加8%焦粉于700℃下磁化焙烧60 min,焙烧样以硫脲法浸金,金浸出率达65.87%;浸金渣经磨矿磁选得到TFe品位为55.01%的初级铁精粉,再于90℃的10%NaOH溶液中碱浸8 h,可得TFe品位为62.22%、回收率为69.80%的合格铁精粉。物相转化和热力学计算表明,磁化焙烧过程中含铁矿物与Si、Ca、Al及重金属等杂质反应,生成铁橄榄石、钙铝榴石和铁钙辉石等新物相,与磁铁矿紧密共生,混入铁精粉中;微细粒磁铁矿存在严重磁团聚,石英等杂质会机械夹杂在磁团聚中,降低铁精粉质量。 相似文献
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难浸砷金精矿的碱性常温常压预氧化 总被引:7,自引:0,他引:7
本文提供了1种难浸金精矿的湿法预氧化新工艺,它包括细磨、强化碱浸预氧化、氰化和炭吸附。在螺旋搅拌式塔式磨浸机中,先将目的难浸金精矿细磨至98%<37μm,然后在40%的矿浆质量浓度、11℃的环境温度和0.1MPa的环境压力下强化碱浸24h,NaOH的消耗量为88kg/t矿,仅为相同氧化率条件下将砷硫氧化成砷酸盐和硫酸盐所需理论碱耗量的30%。预氧化完成后经36h的氰化浸出和炭吸附,金的浸出率从预氧化前的24.6%提高到95.4%,金的吸附率99.2%,NaCN的消耗4kg/t矿。整个提金工艺的成本约300元/t矿。 相似文献
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Kinetic process of oxidative leaching of chalcopyrite under low oxygen pressure and low temperature 总被引:2,自引:0,他引:2
Kinetic process of oxidative leaching of chalcopyrite in chloride acid hydroxide medium under oxygen pressure and low temperature was investigated. The effect on leaching rate of chalcopyrite caused by these factors such as ore granularity, vitriol concentration, sodium chloride concentration, oxygen pressure and temperature was discussed. The results show that the leaching rate of chalcopyrite increases with decreasing the ore granularity. At the early stage of oxidative reaction, the copper leaching rate increases with increasing the oxygen pressure and dosage of vitriol concentration, while oxygen pressure affects leaching less at the later stage. At low temperature, the earlier oxidative leaching process of chalcopyrite is controlled by chemical reactions while the later one by diffusion. The chalcopyrite oxidative leaching rate has close relation with ion concentration in the leaching solution. The higher ion concentration is propitious for chalcopyrite leaching. 相似文献
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采用X射线荧光光谱法(XRF)、火试金法和显微硬度仪对常见彩色18K金首饰的成分和硬度进行了检测。研究发现,常见彩色18K金首饰含金量主要在75.1%~75.5%范围内,红色18K金补口成分较单一,铜含量范围在19%~24.8%,黄色和白色18K金补口成分种类较多,同时发现一种含铟电铸工艺的黄色18K金。所测红色、黄色和白色18K金首饰的硬度范围分别为:190~290、130~260和153~243,同款式、形状相似的18K金首饰硬度呈现含镍白色18K金>红色18K金>黄色18K金的规律,源于不同的加工方法及补口元素对金不同的强化效果。 相似文献
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通过三个不同层面对合成金刚石晶体的叶蜡石组装块进行X射线衍射与Raman光谱的检测分析,清晰地表明了叶蜡石晶体在高温高压条件下逐渐相变成硬水铝石、柯石英、蓝晶石的过程.进而得出选择适当的白云石套管壁厚,阻止过多,高硬度蓝晶石新相的形成,以构成合成腔体内压力、温度的合理匹配对合成高质量金刚石有着重要的指导意义. 相似文献