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Quartz crystal microbalance with dissipation (QCM-D) was used to monitor the micro-mass change during the gold leaching process for exploring the variation of gold leaching rate in cyanide solution. It is found that with a cyanide ion concentration of 55.2 mg/L and the dissolved oxygen concentration in the system increased from 1.5 mg/L to 8.5 mg/L, the leaching rate of gold can be increased from 430.9 ng/(cm2·min) to 514.8 ng/(cm2·min), up 19.5%; with the dissolved oxygen at the mass concentration of 8.5 mg/L, an increase in the cyanide ion concentration from 22.6 mg/L to 55.2 mg/L can lead to the gold leaching rate up to 514.8 ng/(cm2·min) from 60.1 ng/(cm2·min), presenting a 7.6-fold improvement. It is concluded that the gold-leaching rate has something to do with the ratio of cyanide ion concentration to dissolved oxygen concentration . The gold leaching rate is higher with at the room temperature.

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采用耗散型石英晶体微天平(QCM-D)实时监测浸金反应过程的微观质量变化,研究了氰化浸金速率的变化规律。结果表明:氰根离子质量浓度55.2 mg/L时,将体系内溶解氧质量浓度从1.5 mg/L提高至8.5 mg/L,浸金速率可从430.9 ng/(cm2·min)提升至514.8 ng/(cm2·min),提高了19.5%;溶解氧质量浓度8.5 mg/L时,将氰根离子质量浓度从22.6 mg/L提高至55.2 mg/L,浸金速率可从60.1 ng/(cm2·min)提升至514.8 ng/(cm2·min),提高了7.6倍。浸金速率与氰根离子质量浓度和溶解氧质量浓度的比值相关,室温下时,浸金速率较快。

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汤亦婧(1995—),女,黑龙江大庆人,硕士,工程师,主要从事有色、稀贵金属选矿工艺及药剂研发工作。E-mail:

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汤亦婧(1995—),女,黑龙江大庆人,硕士,工程师,主要从事有色、稀贵金属选矿工艺及药剂研发工作。E-mail:

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Calculation results of gold leaching rate

, figureFileSmall=null, figureFileBig=null, tableContent=
编号 /(mg·L-1 /(mg·L-1浸金速率/[(ng/(cm2·min)-1]
155.21.5430.936.8
255.28.5514.86.5
322.68.560.12.7
), ArticleFig(id=1240693484508737767, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631879557247936, language=CN, label=表1, caption=

浸金速率计算结果

, figureFileSmall=null, figureFileBig=null, tableContent=
编号 /(mg·L-1 /(mg·L-1浸金速率/[(ng/(cm2·min)-1]
155.21.5430.936.8
255.28.5514.86.5
322.68.560.12.7
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基于QCM-D技术的氰化浸金速率影响规律研究
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汤亦婧 , 朱阳戈 , 赵志强 , 罗思岗 , 胡志凯 , 赵杰 , 张晓亮
矿冶工程杂志 | 冶金 2025,45(1): 118-122
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矿冶工程杂志 | 冶金 2025, 45(1): 118-122
基于QCM-D技术的氰化浸金速率影响规律研究
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汤亦婧 , 朱阳戈, 赵志强, 罗思岗, 胡志凯, 赵杰, 张晓亮
作者信息
  • 矿冶科技集团有限公司 矿物加工科学与技术国家重点实验室,北京 102628
  • 汤亦婧(1995—),女,黑龙江大庆人,硕士,工程师,主要从事有色、稀贵金属选矿工艺及药剂研发工作。E-mail:

Change Rule of Gold Leaching Rate in Cyanide Solution Based on QCM-D Technology
Yijing TANG , Yangge ZHU, Zhiqiang ZHAO, Sigang LUO, Zhikai HU, Jie ZHAO, Xiaoliang ZHANG
Affiliations
  • BGRIMM Technology Group, State Key Laboratory of Mineral Processing, Beijing 102628, China
出版时间: 2025-02-01 doi: 10.3969/j.issn.0253-6099.2025.01.022
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采用耗散型石英晶体微天平(QCM-D)实时监测浸金反应过程的微观质量变化,研究了氰化浸金速率的变化规律。结果表明:氰根离子质量浓度55.2 mg/L时,将体系内溶解氧质量浓度从1.5 mg/L提高至8.5 mg/L,浸金速率可从430.9 ng/(cm2·min)提升至514.8 ng/(cm2·min),提高了19.5%;溶解氧质量浓度8.5 mg/L时,将氰根离子质量浓度从22.6 mg/L提高至55.2 mg/L,浸金速率可从60.1 ng/(cm2·min)提升至514.8 ng/(cm2·min),提高了7.6倍。浸金速率与氰根离子质量浓度和溶解氧质量浓度的比值相关,室温下时,浸金速率较快。

氰化浸出  /  反应速率  /  溶解氧  /  石英晶体微天平  /  金矿  /  浸金

Quartz crystal microbalance with dissipation (QCM-D) was used to monitor the micro-mass change during the gold leaching process for exploring the variation of gold leaching rate in cyanide solution. It is found that with a cyanide ion concentration of 55.2 mg/L and the dissolved oxygen concentration in the system increased from 1.5 mg/L to 8.5 mg/L, the leaching rate of gold can be increased from 430.9 ng/(cm2·min) to 514.8 ng/(cm2·min), up 19.5%; with the dissolved oxygen at the mass concentration of 8.5 mg/L, an increase in the cyanide ion concentration from 22.6 mg/L to 55.2 mg/L can lead to the gold leaching rate up to 514.8 ng/(cm2·min) from 60.1 ng/(cm2·min), presenting a 7.6-fold improvement. It is concluded that the gold-leaching rate has something to do with the ratio of cyanide ion concentration to dissolved oxygen concentration . The gold leaching rate is higher with at the room temperature.

cyanide leaching  /  reaction rate  /  dissolved oxygen  /  quartz crystal microbalance (QCM)  /  gold ore  /  gold leaching
汤亦婧, 朱阳戈, 赵志强, 罗思岗, 胡志凯, 赵杰, 张晓亮. 基于QCM-D技术的氰化浸金速率影响规律研究. 矿冶工程杂志, 2025 , 45 (1) : 118 -122 . DOI: 10.3969/j.issn.0253-6099.2025.01.022
Yijing TANG, Yangge ZHU, Zhiqiang ZHAO, Sigang LUO, Zhikai HU, Jie ZHAO, Xiaoliang ZHANG. Change Rule of Gold Leaching Rate in Cyanide Solution Based on QCM-D Technology[J]. Mining and Metallurgical Engineering, 2025 , 45 (1) : 118 -122 . DOI: 10.3969/j.issn.0253-6099.2025.01.022
氰化浸出是从细粒金矿石中提取金、银的主要方法[1],它具有工艺成熟、提取率高、对矿石适应性强等优点[2]。自1889年新西兰科鲁恩矿建成了世界上第一座氰化提金厂至今,氰化提金已有100多年的历史[3]。氰化浸金的机理主要包括氧论、氢论、过氧化氢论、氰论和腐蚀论,通过大量试验和实践验证,氧论、过氧化氢论和腐蚀论被大多数研究者认同。腐蚀论认为金在氰化物溶液中的溶解是一个电化学腐蚀过程[4],溶解时金表面的阳极和阴极两部分构成短路[5],金在阳极给出电子并形成金氰配合物,氧气在阴极被还原成过氧化氢,生成金氰配合物的速率主要取决于氰根离子和氧的浓度[6]
耗散型石英晶体微天平(quartz crystal microbalance with dissipation,QCM-D)是20世纪60年代初发展起来的一种非常灵敏的质量检测仪器,其测量精确度可达纳克级[7],理论上可以测到的质量变化相当于单分子层或原子层的几分之一,已被广泛应用于化学、生物、医学和表面科学等领域。QCM-D在研究金属溶解机理,尤其是在产物可溶的金属阳极溶解方面也有较多应用,主要集中在研究金属薄膜溶解速度与介质pH值、浓度等因素对反应速度的影响规律以及电极过程机理等方面[8]
本文利用QCM-D对浸金反应过程的微观质量变化进行实时监测,获得氰化浸金过程中石英晶体谐振器表面质量随时间的变化规律,研究溶解氧及氰根离子浓度对氰化浸金速率的影响规律。
试验用QCM-D为瑞典百欧林公司的QSence E4型石英晶体微天平,它主要由石英晶体谐振器、样品平台、流动池、蠕动泵、驱动电路以及控制软件等工作单元组成[9]。QCM-D是基于石英晶体压电效应发展起来的一种测量仪器[10],根据其共振频率变化(Δf)和能量耗散因子变化(ΔD)可以精确测量出石英晶体谐振器表面物质纳克级的质量变化情况。石英晶体芯片是QCM-D的核心部件,可以根据需求在其工作电极上涂镀不同的待测物质。本次试验的待测物质为厚度10 nm、直径10 mm的金镀层。
其他试验设备包括美国哈希公司HQ-30D型溶解氧测试仪、雷磁PHB-4型pH计。试验试剂为工业级氰化钠、分析纯级氢氧化钠、氮气等。
配制不同氰根离子质量浓度及溶解氧质量浓度的试验溶液,通过蠕动泵将溶液泵入液体池,经过石英晶体芯片表面发生反应后再从出液口泵出。谐振器表面发生反应时,会输出共振频率变化(Δf)和能量耗散因子变化(ΔD)的电信号,经过计算机模拟和计算后分别输出两者随时间的变化曲线,从而判断吸附层性质并计算得到谐振器的质量改变量(Δm)随时间的变化。
根据Sauerbrey公式,当吸附层为刚性吸附时,即吸附层厚度较薄且均匀,溶剂黏弹性不变(ΔD≤5.0×10-6[11],可推导出谐振器的频率改变量Δf与谐振器的质量改变量(Δm)满足线性关系[12]
式中:c为常数,c=17.8 ng/(cm2·Hz);n为谐波数,本文取n=1。
金的氰化浸出过程是在固、液、气三个界面进行的多相化学反应,反应步骤包括:①反应物氰根离子和溶解氧由溶液内部向矿粒表面及裂隙中扩散;②金表面发生氧化还原反应;③反应生成物从金表面脱离向溶液转移。
金在含氧氰化物溶液中的电化学溶解过程见图1
浸金反应的总反应为:
依据Fick定律,可得:
式中:分别为O2和CN-的扩散速度,mol/s;分别为O2和CN-的扩散系数,cm2/s;分别为溶液内部O2和CN-浓度,mol/mL;分别为金表面上O2和CN-浓度,mol/mL;S1S2分别为发生阴极和阳极反应的表面积,cm2δ为界面层厚度,cm。
金属表面的化学反应速度很快,金的浸出速度主要取决于溶液中O2和CN-的扩散速度,O2和CN-扩散到金表面时会立刻发生反应而被完全消耗,所以可认为金表面的O2和CN-浓度为0,即,则式(3)~(4)可简化为:
由以上分析可得,金的浸出速度vAu是消耗氧速度的2倍,是消耗氰化物速度的0.5倍,可得:
与液相接触的金属总表面积S为:S=S1+S2,代入式(7),可得:
氰根离子浓度很低时,式(8)中分母的前一项可忽略不计,可得:
溶解氧浓度很低时,式(8)中分母的后一项可忽略不计,可得:
式中K1K2均为常数。
由式(9)和式(10)可知,溶液中氰根离子浓度很低时,金浸出速度仅与溶液中CN-浓度有关;溶液中溶解氧浓度较低时,金浸出速度仅与溶液中O2浓度有关。
联立式(9)和式(10)可求得氰化物和溶解氧处于最佳浓度时的配比为:
在25 ℃室温下平均值约为1.5,由此可推出时可达到金的极限溶解速度。
为验证上述氰化浸金速率的影响因素分析结果,利用QCM-D对不同氰根离子浓度和溶解氧浓度条件下浸金反应过程的微观质量变化过程进行实时测定。采用氢氧化钠调节超纯水的pH值至11,作为背景溶液,并以此配制不同溶解氧质量浓度和CN-质量浓度的浸出剂溶液,反应均在25 ℃室温条件下进行。首先以100 μL/min的流速泵入超纯水,待系统Δf稳定后(波动小于1 Hz),泵入pH=11的背景溶液,待系统Δf再次稳定后再泵入待测溶液。
以氰化钠配制CN-质量浓度55.2 mg/L的浸出剂溶液,测得溶液的溶解氧质量浓度为8.5 mg/L,另外通过鼓入氮气的方法吹脱溶液中的溶解氧,得到溶解氧质量浓度1.5 mg/L的低氧溶液,进行不同溶解氧质量浓度条件下的QCM-D试验,得到谐振器的频率改变量(Δf)及能量耗散改变量(ΔD)随时间的变化曲线,如图2所示。由图2可知,向系统中通入浸出剂溶液后(从a处开始),Δf立即呈与时间正相关的线性关系上升,说明浸出剂与谐振器表面的金发生了化学反应;ΔD<2.0×10-6,表明谐振器表面发生的能量耗散改变量较小,可认为产生的为刚性吸附。待反应稳定后,开始向系统通入超纯水进行冲洗(从b处开始),Δf上升速度逐渐减缓,之后稳定在某一值,说明浸出剂与谐振器表面的金发生的反应是不可逆的;ΔD先突减后逐渐恢复至初始状态,说明冲洗过程中谐振器表面的药剂和生成的其他物质等被冲走,表面性质产生了变化,待冲洗完杂质后,谐振器又回到了反应前的状态,反应前后谐振器表面性质变化不大。
由于金镀层在谐振器表面产生的吸附为刚性吸附,满足Sauerbrey公式(式(1)),谐振器质量改变量与频率改变量呈线性关系,由此可计算得到谐振器质量改变量随时间的变化曲线,见图3。从0至a处为向系统泵入超纯水和背景溶液的阶段,谐振器表面质量未发生改变;从a处开始,泵入浸出剂使得谐振器表面质量立即下降,且与时间呈负相关的线性关系,说明谐振器表面发生了匀速的化学反应,金镀层上的金被浸出剂溶解导致谐振器表面质量下降;从b处开始通入超纯水进行冲洗,谐振器表面的杂质被冲走,产生缓慢的质量下降,冲洗完成后质量趋于稳定。溶解氧质量浓度高的试验组Δm下降速度更快,说明反应进行的速度较快。
采用氰化钠配制CN-质量浓度分别为55.2 mg/L和22.6 mg/L的浸出剂溶液,经溶氧仪测得溶液的溶解氧质量浓度为8.5 mg/L,进行不同氰根离子质量浓度条件下的试验,得到谐振器的频率改变量(Δf)及能量耗散改变量(ΔD)随时间的变化曲线,结果如图4所示。分析过程同上。系统的ΔD<2.0×10-6,说明谐振器表面产生的是刚性吸附。
依据Sauerbrey公式计算得到谐振器的质量改变量随时间的变化曲线如图5所示。从a处开始向系统泵入不同氰根离子质量浓度的浸出剂溶液,谐振器表面质量迅速发生变化,呈与时间线性相关的下降趋势,说明泵入系统的浸出剂与谐振器表面金镀层的金发生了化学反应被溶解,谐振器表面质量减少,其中氰根离子质量浓度较高的试验组质量下降更迅速,说明浸金速度更快。
根据QCM-D试验得到的石英晶体谐振器表面质量随时间变化曲线,通入浸出剂溶液的阶段(从a处至b处),Δm与时间呈线性关系,其斜率即为浸金速率,计算结果见表1。结果表明,体系中氰根离子浓度足量但溶解氧浓度较低时,金的浸出速率仅与溶解氧浓度相关,将溶解氧质量浓度从1.5 mg/L提升至8.5 mg/L,金的浸出速率从430.9 ng/(cm2·min)提高到514.8 ng/(cm2·min),提高了19.5%;体系中溶解氧浓度足量但氰根离子质量浓度较低时,金的浸出速率仅与氰根离子质量浓度相关,将氰根离子质量浓度从22.6 mg/L提升至55.2 mg/L,金的浸出速率可从60.1 ng/(cm2·min)提升至514.8 ng/(cm2·min),提高了7.6倍;浸金速率同样与相关,室温下,时,金的浸出速率较快,这与氰化浸金速率的影响因素分析结果一致。
1)氰化浸金速率的影响因素分析结果表明,氰化浸金体系内的氰根离子浓度与溶解氧浓度是影响金溶解速率的关键因素,溶液中氰根离子浓度较低时,金的浸出速度仅与溶液中的CN-浓度有关;溶液中溶解氧浓度较低时,金的浸出速度仅与溶液中的O2浓度有关。25 ℃室温下,时可达到金的极限溶解速率。
2)利用石英晶体微天平对氰化浸金反应过程进行实时监测,结果表明:室温、氰根离子质量浓度55.2 mg/L条件下,将体系内溶解氧质量浓度从1.5 mg/L提升至8.5 mg/L,金浸出速率可从430.9 ng/(cm2·min)提升至514.8 ng/(cm2·min),提高了19.5%;溶解氧质量浓度8.5 mg/L条件下,将氰根离子质量浓度从22.6 mg/L提升至55.2 mg/L,金浸出速率可从60.1 ng/(cm2·min)提升至514.8 ng/(cm2·min),提高了7.6倍。
3)时,金浸出速率较快,验证了氰化浸金速率的影响因素分析结果。
  • 中国和乌兹别克斯坦政府间联合研发项目(2022YFE0126700)
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2025年第45卷第1期
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doi: 10.3969/j.issn.0253-6099.2025.01.022
  • 接收时间:2024-08-14
  • 首发时间:2026-03-17
  • 出版时间:2025-02-01
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  • 收稿日期:2024-08-14
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中国和乌兹别克斯坦政府间联合研发项目(2022YFE0126700)
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    矿冶科技集团有限公司 矿物加工科学与技术国家重点实验室,北京 102628
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2种不同金属材料的力学参数

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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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