含砷难浸金矿的硫代硫酸盐法浸金

研究了云南某金矿的含砷难处理浮选金精矿的预处理方法．通过４３０℃和６５０℃二阶段富氧焙烧和４０％ＮａＯＨ溶液吸收废气中的Ａｓ２Ｏ３和ＳＯ２，既使金转变为易浸状态，又有效地避免了空气污染．还探讨了影响硫代硫酸盐法浸金的因素，在最佳浸金条件下，金的浸出率达９１％以上．     

硫脲法浸金研究

硫脲法浸金是近年来引人注目且比较活跃的研究课题。本文研究了硫脲浓度、氧化剂用量、浸取温度和浸取时间对金的浸出率的影响,探求了硫脲法浸金的适宜条件。     

降低碘化浸金碘用量的途径

碘化浸金是一种新的、有望取代氰化法的非氰提金方法。由于碘的价格相对较高,减少碘用量降低生产成本,对碘化浸金实现工业化具有重大意义。通过实验研究探讨了碘化浸金中助氧化剂、浸出时间、焙烧、I^--OCl^-体系浸金对降低碘用量的影响。实验表明：使用双氧水、低碘质量分数下适当延长浸出时间、原矿焙烧后浸出、采用I^--OCl^-体系浸金均能达到降低碘用量的目的。尤其是使用双氧水、焙烧后浸出降低碘用量效果明显。     

低品位原生金矿的生物柱浸

采用粘结剂S-11将某低品位原生金矿的精矿粘结包裹在其原矿矿石上进行生物柱浸与原矿生物柱浸的对比研究.主要研究了生物柱浸过程中Fe2+浓度,pH,Eh,矿石表面吸附的细菌及菌液中游离细菌数量的变化、矿石的脱砷率、脱硫率,生物柱浸后矿石金的氰化浸出率.结果表明:金精矿包裹后的矿石表面因含硫化矿物较多,更适合细菌的吸附与繁殖;包裹生物柱浸120 d后矿石的脱砷率为70.14%,脱硫率为41.26%,金的氰化浸出率为81.21%,比传统生物柱浸矿石的脱砷率、脱硫率和浸金率分别高24.01%,19.11%和21.48%.包裹生物柱浸对矿石的氧化效果明显.     

吉尔吉斯某金矿不同浸金剂浸出试验研究

针对吉尔吉斯某金矿的矿石性质,考察了不同环保型浸金剂与氰化钠的浸出效果。结果表明:三种环保药剂与氰化钠对比,在增加药剂用量的情况下可以达到相应的金浸出率指标93. 68%;随着AX浸金剂用量的增加,金浸出率增大,当达到1.4 kg/t时,金浸出率稳定;通过柱浸试验,在17天时浸出基本结束,最终金浸出率为91.19%。AX浸出剂可以替代氰化钠进行浸出作业,具有良好的应用前景。     

硫代硫酸盐法无毒浸金技术研究

现在我们析金过程中采用的是老旧的氰化物提金生产技术，这个技术在生产中会产生我们所说的三废现象，导致我们的环境受到破坏，在此情况下，我们采用了新的析金技术，硫代硫酸盐法无毒浸金技术。本文在提出硫代硫酸盐法无毒浸金技术的背景下，对硫代硫酸盐法无毒浸金技术作了概述，并结合实验案例分析了析金措施，最后得出在25℃～85℃温度之间是最好的无毒析金黄金温度。     

难浸金矿扩大试验研究

对黔西南州高砷高硫难浸金矿进行二段焙烧预处理，采用氧化剂强化氰金进行扩大试验研究。结果表明：该工艺使金的浸出率达到85％以上，该工艺投资省，无环境污染。     

钢铁件直接化学浸镀仿金工艺研究

采用化学抛光＋化学浸镀仿金工艺组合,研究成功一种新的钢铁件直接化学浸镀仿金工艺,探讨了化学镀仿金液中主要成分硫酸铜、硫酸亚锡、配位剂、稳定剂等及工艺条件温度、施镀时间对仿金层质量的影响,检测了仿金层的相关性能,研究确定的工艺规范如下：8～10g／LSnSO4,1．6～2．0g／LCuS04,10～15g／L配位剂,10～20mL／LH2SO4,10～12mL／L稳定剂XT-08,温度：15～35℃,时间10～15min,所形成的仿金层色泽均匀,达18～22K,装饰效果好,且工艺操作简单,镀液无毒,对环境污染小,且仿金镀液成分简单,操作简便,因而具有广阔的应用前景．     

小麦主要浸麦工艺的研究

本文对小麦主要浸麦工艺进行了研究。根据颗粒污染程序，甲醛添加量为0.05-0.1‰；浸麦度达到约39%时入发芽箱，最终浸麦度为42-45%，最高不超过46%；采用浸水断水浸麦法，在空气休止期间排除CO2；浸麦度一定时，随着浸麦温度的提高，浸麦时间缩短。     

碘化浸金过程的基本理论

碘化浸金被证明是一种有效环保的非氰浸金方法,但金溶解过程中的基本理论目前研究很少。结合热力学数据,计算了实际的浸金体系中主要反应平衡电位,建立了可能存在的化学反应及电位和pH之间的关系式,完整地做出了实际浸金体系的V—pH图,并对碘化浸金机理进行分析。该研究为碘化浸金的工业化提供了理论指导。     

含铜难处理金矿选择性浸出试验研究

针对某含铜难处理金矿进行了碘化法和石硫合剂(lime sulfur synthetic solution,LSSS)法的选择性浸金的研究。结果表明,在碘单质质量浓度为8g/L,浸出时间为2h的条件下,碘化法浸出金的浸出率为88.1%,而且铜的浸出率不足1%。在石硫合剂质量分数为25%,浸出时间为6h的条件下,LSSS法浸出金的浸出率仅为73.5%。对比碘化浸出和石硫合剂浸出效果可知,碘化法对该含铜难处理金矿不仅浸出速度快、浸出率高而且铜几乎不被浸出,具有很强的选择性浸金作用。     

丁二酮肟-氧化剂型无毒浸金剂的浸出性能研究

用分子设计理论提出了一类新型浸金剂 ,它由丁二酮肟和某种氧化剂构成 ,具有无毒害和化学稳定性好的特点 ,实验结果表明 :1)丁二酮肟能与许多氧化剂尤其是高锰酸钾组合成高效浸金剂 ;2 )在丁二酮肟 -高锰酸钾浸出体系中 ,适宜的Ox/Lig(氧化剂与金络剂分子比 )比值范围为 0 .2 5～ 0 .50 ,最佳范围为 0 .30～0 .4 0 ;3)丁二酮肟 -高锰酸钾浸出体系的操作pH范围为 8～ 10 ;4 )与氰化物相比 ,丁二酮肟的浸出率与它相当但浸出速度明显快很多 ;5)从含丁二酮肟的浸出贵液中回收金既可采用炭吸附法也可采用锌置换法 图1,表 5,参 9     

New insights into the extraction of invisible gold in a low-grade high-sulfur Carlin-type gold concentrate by bio-pretreatment

To extract gold from a low-grade (13.43 g/t) and high-sulfur (39.94wt% sulfide sulfur) Carlin-type gold concentrate from the Nibao deposit, Guizhou, a bio-pretreatment followed by carbon-in-pulp (CIP) cyanide leaching process was used. Various methods were used to detect the low-grade gold in the concentrate; however, only time-of-flight secondary-ion mass spectrometry (TOF-SIMS) was successful. With bio-pretreatment, the gold recovery rate increased by approximately 70.16% compared with that obtained by direct cyanide leaching of the concentrate. Various attempts were made to increase the final gold recovery rate. However, approximately 20wt% of the gold was non-extractable. To determine the nature of this non-extractable gold, mineralogy liberation analysis (MLA), formation of secondary product during the bio-pretreatment, and the preg-robbing capacity of the carbonaceous matter in the ore were investigated. The results indicated that at least four factors affected the gold recovery rate:gold occurrence, tight junctions of gold-bearing pyrite with gangue minerals, jarosite coating of the ore, and the carbonaceous matter content.     

从难处理金矿中回收金:黄铁矿对硫脲浸金体系稳定性的影响

The extraction of gold from refractory gold ores (RGOs) without side reactions is an extremely promising endeavor. However, most RGOs contain large amounts of sulfide, such as pyrite. Thus, investigation of the influence of sulfide on the gold leaching process is important to maximize the utilization of RGOs. In this work, the effects of pyrite on the stability of the thiourea system were systematically investigated under different conditions. Results showed that the decomposition rate of thiourea was accelerated sharply in the presence of pyrite. The effect of pyrite on gold recovery in thiourea leaching systems was then confirmed via a series of experiments. The decomposition efficiency of thiourea decreased by 40% and the recovery efficiency of gold increased by 56% after the removal of sulfide by roasting. Under optimal conditions, the efficiency of the gold recovery system increased to 83.69% and only 57.92% of thiourea decomposition was observed. The high consumption of thiourea by the leaching system may be attributed to not only adsorption by mineral particles but also catalytic decomposition by some impurities in the ores, such as pyrite and soluble ferric oxide.     

Comprehensive recovery of gold and base-metal sulfide minerals from a low-grade refractory ore

The comprehensive recovery of small amounts of valuable minerals such as gold and base-metal sulfide minerals from a low-grade refractory ore was investigated. The following treatment strategy was applied to a sample of this ore: gold flotation–gold concentrate leaching–lead and zinc flotation from the gold concentrate leaching residue. Closed-circuit trials of gold flotation yielded a gold concentrate that assayed at 40.23 g·t-1 Au with a recovery of 86.25%. The gold concentrate leaching rate was 98.76%. Two variants of lead-zinc flotation from the residue—preferential flotation of lead and zinc and bulk flotation of lead and zinc—were tested using the middling processing method. Foam from the reflotation was returned to the lead rougher flotation or lead–zinc bulk flotation, whereas middlings from reflotation were discarded. Sulfur concentrate was a byproduct. The combined strategy of flotation, leaching, and flotation is recommended for the treatment of this kind of ore.     

N235协同萃取碱性氰化浸金溶液中的金(I)

由N235与路易斯碱三辛基氧膦(TOPO)组成协同萃取体系,对碱性氰化浸金贵液中金(I)协同萃取和反萃进行了研究.研究了有机相中N235含量、水相平衡pH、相比等因素对金(I)萃取率的影响,考察了反萃液中氢氧化钠液浓度对负载金有机相的反萃效果.结果表明,采用有机相为10%+10%协萃剂TOPO+80%煤油的协萃体系,对pH=9~10和初始金(I)质量浓度ρO=10.87 mg/L碱性氰化浸金贵液进行萃取时,经一级萃取后,萃取率可高达98%左右;同时,采用0.05~0.1 mol/L的氢氧化钠溶液可对负载有机相进行反萃,反萃率达到91%以上.     

高压脉冲放电预处理强化卡林金浸出效果分析

A high-voltage pulsed discharge (HVPD) pretreatment was used to strengthen the leaching effect of Carlin-type gold ore containing arsenic. Optimal results of the pretreatment experiments were obtained at the following operating conditions: a spherical gap spacing of 20 mm, pulse number of 100, and voltage of 30 kV. The leaching rate of gold was increased by 15.65% via the HVPD pretreatment. The mass fraction of –0.5+0.35 mm and –0.35+0.1 mm was increased by 10.97% and 6.83% compared to the untreated samples, respectively, and the Au grade of –0.1 mm was increased by 22.84%. However, the superiority of the HVPD pretreatment would be weakened by prolonged grinding time. Scanning electron microscopy results indicated that the pretreated products presented as a melting state and then condensation, accompanying by some pore formation. More micro-cracks were generated at the interface of the ore and the original crack were expended via pulsed discharge pretreatment, with the contact area between the leaching reagent and ore increased, the leaching reaction rate enhanced and the leaching effect strengthened.     

淋湘金矿地球化学特征

陕西旬阳淋湘金矿床产于南秦岭古生界泥盆系地层中,容矿围岩主要为碳酸盐岩和细碎屑岩,金矿体主要受近东西向断裂控制．第Ⅱ、第Ⅲ矿化阶段为金的主要矿化阶段,第Ⅱ～Ⅲ阶段石英包体中N2含量大于21μg/g,而第Ⅳ阶段矿物中的N2含量均小于1μg/g,说明成矿流体中的N2含量减少对金矿化不利;成矿流体的氢氧同位素组成与变质水相当;矿石的硫同位素早期为18.21‰,中晚期为17.83‰～14.01‰;铅具有正常铅同位素特征;不同矿化程度的矿石的稀土元素组成的球粒陨石标准化分配曲线,呈富轻稀土的右倾型,曲线形态基本一致,随着矿化增强其稀土元素含量明显增高．这些矿床地球化学特征表明,成矿金属元素和硫主要来源于造山带围岩地层,属容矿岩石为沉积岩中的浅层渗滤同生热盐水型金矿床,成矿时代为燕山期．     

含金矿物的氰化浸取动力学

筛选了一种能强化金浸取反应速率的添加剂——间硝基苯磺酸钠(MS),并进行了浸取反应过程的动力学研究。讨论了MS和氰化钠浓度、温度、搅拌强度及矿物粒度等因素对浸取反应的影响。MS通过改变阴极反应体系强化了金的氰化浸取反应速率,且对浸取液中氰化物无破坏作用。采用收缩未反应芯模型较好地描述了金的浸取过程,金浸取的动力学过程受扩散控制。同时导出了宏观动力学方程。用黄铁矿焙渣在串联式池浸装置中进行工业化模拟试验的结果表明,含MS的浸取液,浸取金含量仅为0.94g/t的矿渣,具有较力满意的结果。