共查询到19条相似文献，搜索用时 144 毫秒
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本文介绍了堆浸提金原理和在实验室进行金矿石堆浸可行性研究的方法.以我国辽宁猫岭金矿、四川茶铺子金矿和福建紫金山金矿为研究对象,研究了矿石粒度、氰化钠溶液浓度、浸出时间等因素对金浸出率的影响,从而确定堆浸提金最佳工艺条件.通过对上述三类矿石性质及堆浸性能的比较,认为矿石的物质组成和金的嵌布特性对金的浸出率影响较大. 相似文献
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桂西低品位微细粒型金矿石堆浸技术 总被引：1，自引：0，他引：1
桂西低品位微细粒型金矿石堆浸技术原则工艺已日趋完善,通过变一次性底垫多为次使用底垫,改变矿石筑堆方法,提高喷淋强度;变间歇性吸附为全天候吸附等技改措施,达到增强矿堆过透水性,提高浸出率,缩短喷淋周期,降低生产成本,提高经济效益的目的。 相似文献
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云南富源胜境关金矿开发生产初期，运用堆浸理论，根据矿山工业场地实际和矿石的物理化学性质，及矿石中的有害杂质(组织)的含量，多次试验、调整技术参数(堆浸场地物理性质、矿石粒度、矿堆高度、矿堆渗透性、氰化物浓度、浸出液碱性、浸出温度、喷淋强度、吸附流速或流量等)，完善浸出工艺，缩短浸出周期，提高浸出率，取得了良好的经济效益。 相似文献
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泥旦沟金矿采用堆浸工艺，对低品位矿石进行提金试验。试验矿石品位２．２５ｇ／ｔ，规模４７９５ｔ。金的浸出率６７．７４％，单位矿石利润６６．８元／ｔ，经济临界品位降至１．２３ｇ／ｔ，矿山服务年限得到有效延长。 相似文献
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1前言堆浸法提金自问世以来，得到迅速发展，因它解决了低品位金矿的开发问题，是一项值得推广应用的新技术。该提金技术近几年风靡全国各地，单位、个人都在上，一些地勘单位已成为支柱产业。堆浸提金的工艺流程较简单，但浸矿使用了剧毒品氰化钠，在生产过程中对周围环境的影响如何，已引起众人和环保部门的关注。带着这个问题，笔者调查了两个堆浸提金的矿山，以矿山的环保问题有一定认识，供从事金矿堆浸人员参考。2矿山采用的浸矿L艺流程配制0．05％浓度的氰化钠硷性溶液喷淋矿石，使金浸出，用炭吸附，浸出化学反应式为：4All＋SNS… 相似文献
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堆浸法提金一般是将低品位(0.8×10~(-6)—3×10~(-6)矿石破碎,堆积在由防渗材料铺筑的堆矿场上,用稀的碱性NaCN溶液在矿堆上喷淋,使金(银)溶解。贵液从矿堆中渗滤出来,流入矿堆周围的沟中,再流入贵液池内。用活性炭吸附或锌粉置换沉淀法从贵液中回收金,贫液再反回矿堆,循环进行,直至各堆浸场金浸出完成为止。堆浸提金的这种方法仍然是技术上还很年轻的提金工艺,与其他方法一样,人们同样会提出那些与成本、回收率等有关的问题。所以该工艺被应用以来,人们就不间断地寻找改进工艺、提高回收率、降低 相似文献
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德兴铜矿是我国乃至世界著名的低品位多金属岩型铜矿之一。多年来,德兴铜矿在低品位矿石堆浸过程中只对Cu元素进行回收,而对Re、Co、Au、Ag等伴生元素研究甚少。本文采用X射线衍射、扫描电镜与电镜能谱、电子探针以及ICP-MS等方法对德兴铜矿杨桃坞与祝家村堆浸场低品位矿石进行测试分析,研究了低品位矿石矿物组成变化、重要共伴生元素的赋存状态与空间分布规律,并对其进行了综合利用的可行性评价。研究结果表明,Au主要以自然金形式存在,Ag以单质和化合物两种形式存在,Co主要以类质同像形式存在;Re与Mo含量很低,无利用价值;Co元素含量相对较高,均值19 g/t左右,浸出率为73%,因此回收酸性水库中的Co元素可能具有重大经济价值;杨桃坞堆浸场Au平均含量0.10 g/t,几乎无浸出;Ag平均含量0.39 g/t,浸出率较低,可作为一种潜在资源。此外,堆浸场中金红石含量较丰富,平均粒度20μm左右,估算储量达460万吨,有必要对其回收性开展深入研究。 相似文献
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微细粒浸染型泥质金矿石制粒堆浸生产试验 总被引：1，自引：0，他引：1
广西乐业县浪全微细粒浸染型泥质金矿石，属氧化矿石，含泥蛳大，能直接堆浸，采用制粒堆浸工艺，其流程是：原矿－破碎－制粒－筑堆－浸出－炭吸附－解吸－电解－熔炼。各项技术经济指标先进，经济效益好。 相似文献
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铀矿堆浸浸出法进行铀矿采集生产时存在着矿料浸出率过低、溶解酸耗量过大、产生较大环境污染等问题。以江西某铀矿作为研究对象,通过堆浸试验进行分析研究,优化铀矿堆浸的工艺参数:铀矿堆浸高度宜为3.5~4.0m,矿石粒径级配为6~8mm,在喷淋浸出初期(0~30d)采用20g/L的浓硫酸进行喷淋,喷淋强度宜为15L/(h·m2),在喷淋浸出期(30d~60d)采用20g/L的浓硫酸进行喷淋,喷淋强度宜为20L/(h·m2),在喷淋浸出后期(60d~120d)采用10g/L的浓硫酸进行喷淋,喷淋强度宜为8L/(h·m2)。 相似文献
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高砷高锑金矿石属难处理矿石之一，通过对两岔河高砷高锑金矿石采用碱浸预处理后进行堆浸和池浸氰化提金试验，获得了金浸出率76．80％和86．76％的较好指标，为该矿床的开发利用提供了一个工艺简单、经济上可行的途径。 相似文献
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Within the Eastern Desert of Egypt, there are more than a hundred vein-type gold deposits and occurrences. Gold was mined in the Dynastic and Roman periods of the Egyptian history and most of the attention was focused entirely on the near-surface high grade parts of these veins. Currently, besides the more problematic sulfide-rich quartz veins, which generally occur in the lower levels of the worked out auriferous quartz veins, some targets including wall-rock alteration, listwaenite, dumps and tailings of ancient mines, by-product gold hosted in volcanogenic massive sulfide deposits and gold-bearing Algoma-type BIF, as well as alluvial gold constitute the new targets for gold in the Eastern Desert of Egypt. In most of these targets, gold displays a bimodal distribution; occurring both as free-milling gold and in the form of sub-microscopic or “invisible” gold in refractory sulfides and sulfoarsenides such as pyrite, chalcopyrite, arsenopyrite, gersdorffite and pentlandite minerals.Characterizing gold in an ore is important in extraction metallurgy. Free-milling gold can be efficiently recovered by crushing, grinding and cyanidation without additional processing. In refractory ores, on the other hand, conventional milling can liberate the sulfides from the gangue allowing a low content of concentrate to be produced by a process such as flotation. However, direct leaching of the concentrate results in poor gold extractions as the cyanide lixiviant is unable to contact the gold locked within the refractory host. Oxidative pretreatment is required for such ores and the methods available for oxidation are roasting (calcination), pressure oxidation, and bacterial oxidation; all oxidize the refractory minerals in the ore to render the gold amenable to cyanidation. While such oxidative methods are capable of achieving reasonable recoveries, they increase the capital and operating costs. An alternative, applicable to the liberation of gold from the refractory host, is to continue the grinding process to reduce the particle size of the host mineral thereby exposing a part of the gold surface for contact with the cyanide solution. A benefit of this technique is that the environmental aspects of the oxidation reaction products are avoided, however the ultra fine grinding also adds more operating costs.Metallurgical studies carried out on some gold deposits, dumps and tailings of ancient gold mines in Egypt, proved that these ores are amenable to percolation leaching (concentration of KCN varies between 0.5 and 1 g/L) for the (− 10 mm) grain size, and consequently heap leaching is a successful technique as the results of these laboratory scale column tests show. In most of these studies, a marked improvement in the percent of gold recovery was gained when the crushed ore is agglomerated by the addition of water, lime and/or cement particularly in ores containing significant quantities of clay minerals and clay-forming minerals (e.g. sericite and muscovite), and by addition of kerosene which passivates the adsorption surfaces on the graphite.Placer gold is recovered by gravity methods utilizing the large difference in specific gravity between gold and commonly associated minerals such as quartz and feldspar. The equipments range from a simple pan to more complex devices used in gold recovery plants and dredges.Modern studies in Egypt point to the presence of different targets of gold; diverse in their gold content, mode of occurrence of gold and the metallurgical treatments required for extracting gold. With the advance of modern techniques such as Electron Microprobe Analyses (EMPA), laser Ablation Microprobe Inductively Coupled Plasma Mass Spectroscopy (LAM-ICP-MS), gold ores in Egypt should be re-characterized precisely to know the specifications of these ores and consequently predict the metallurgical regime required, and with the high world gold price, it has become necessary to take into consideration the presence of refractory gold ores as one of these targets in Egypt. Generally speaking, laboratory experiments conducted on gold processing in Egypt are encouraging to some extent; however the gold extraction rates of the free milling ores with conventional cyanidation and refractory ores with direct and pretreatment techniques can be improved by modifying the conditions of extraction to be consistent with the results obtained from the re-characterization stage. Otherwise any target for gold and whatsoever the mode of occurrence of gold in this target (i.e. free-milling and/or refractory) could be recovered directly by heap leaching technique and we should accept less than ideal gold recovery for any target when weighed against the capital expenditure required for processes such as roasting, and the continuous grinding processes which might improve recoveries by only a small percentage. 相似文献
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《矿物学报》2013,(Z1)
Heap leaching is a promising, less costly, alternative technology for processing low grade gold ores compared with traditional, energy intensive processes (e.g. autoclave/tank leaching). This research investigated the effectiveness of lime for enhancing gold leaching rates of gold ores from ajialongwa gold mine in china. Column and heaping experiments were performed using cyanide leaching solutions at pH=10, with and without lime (CaO). The presence of lime greatly increased gold leaching rates. Column leaching experiments showed without the addition of lime, there was 35.2% of gold leached. The addition of lime resulted in the release of 50.56% gold. Lime assisted cyanide of refractory gold was proved by heap leaching experiments. 相似文献
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Leaching in the grinding circuit is currently practiced in plants that process gold ores with low content of cyanide consuming minerals. The high gold recovery observed in the grinding–classification section of the plant is commonly explained by the inherent high initial dissolution rate of gold observed in gold ore cyanidation, or by the intense agitation prevailing in grinding mills. For understanding this leaching behavior of gold ores, the grinding, classification and leaching sections of a gold processing plant are analyzed through reconciliation of operating data. It is found that gold circulation in the grinding circuit is quite different from the flow behavior of other species due to the strong gold separation effect in the hydrocyclones, which produces quite large residence time for gold-rich particles. The results presented in this study demonstrate that the residence time of these particles in the grinding circuit can be as long as in the leaching tanks and might be the dominant factor in explaining the high dissolution of gold in this section. 相似文献
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本文从赤卫沟金矿的矿石性质、矿石加工、池浸方法、金银回收方面,介绍了贫硫化物、金颗粒细微、有一定氧化程度的金矿池浸生产实践。从而推荐一种简便、回收率高、投资少、见效快的提工方法－池浸,以便促进矿业开发工作更快发展。 相似文献
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利用细菌对难处理金矿进行浸出处理,具有成本低廉、环境污染小、处理效率高等突出优点,已成为非常有前途的难处理金矿的预处理方法。笔者以河北遵化滑石峪金矿(含金黄铁矿)样品为例,在几种氧化亚铁硫杆菌中发现D3菌种处理此类难浸金矿有显著的增大提金率的效果。在200目粒度条件下,氰化提金率从单纯氰化的63.9%提高到细菌预处理后再氰化的88.2%,而且对100目以下的大粒度金矿,提金率也普遍提高10%以上;此外,还进行了该菌种处理金矿过程的条件实验,如粒度影响、pH值变化和物理方法强化的研究,得出了金矿在细菌氧化过程中的一些规律和在实际操作时的最优化控制条件。 相似文献
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《Chemie der Erde / Geochemistry》2023,83(1):125941
To interpret the leaching rules, select suitable treatment methods, or optimize the treatment process of refractory gold ores, an in-depth analysis of ore characteristics using ore mineralogy is required. In this study, the mineralogical characteristics of a low-grade refractory gold ore were analyzed by a variety of analytical techniques and methods. The ore composition was obtained by chemical analysis, and the main minerals include gold, pyrite, arsenopyrite, feldspar, mica, and quartz. Gold exists in the form of sub-microscopic gold with a particle size of fewer than 1.7 μm, of which 56.90 % is encapsulated gold, 16.97 % is semi-coated gold, and 26.13 % is fractured gold. The content, classification, shape, grain distribution, and occurrence state of the main minerals in the gold ore were obtained by microscopic observation and statistical analysis. Based on the results, the leaching rules of the gold ore were predicted, and suggestions for optimizing the pretreatment process were put forward. These results can accurately guide the pretreatment and leaching process of the gold ore and lay a foundation for the effective utilization of comparable gold ores. 相似文献