共查询到18条相似文献,搜索用时 156 毫秒
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《中国有色金属学报》2016,(1)
对高镁低品位复杂铂钯精矿进行工艺矿物学分析,提出采用硫酸氧压浸出工艺对该精矿中的贱金属铜、镍、铁选择性浸出分离并富集铂钯的处理工艺。考察磨矿粒度、反应温度、时间、初始硫酸浓度、氧压、搅拌速度、木质素磺酸钙用量、液固比对铜、镍、铁浸出率及渣率的影响,确定最佳工艺参数。实验结果表明:当精矿粒度小于43μm占有率为93%、时间3 h、浸出温度150℃、初始硫酸浓度2 mol/L、氧分压0.7 MPa、搅拌速度400 r/min、添加剂木质素磺酸钙用量0.6 g、液固比5:1的最佳工艺条件下,铜浸出率达99.27%、镍浸出率达98.04%、渣率为37%左右,铂钯几乎不被浸出,铂和钯在浸出渣中富集近3倍。 相似文献
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《中国有色金属学报》2019,(2)
为实现从富贵锑中富集提取金的目的,提出采用控电位氯化浸出方法选择性分离富贵锑中贱金属。详细考察了各因素对贱金属浸出率的影响,查明了最优条件下贵金属的溶解行为,采用富贵锑粉置换回收浸出液中的贵金属。结果表明:提高盐酸浓度、增加液固比、提高反应温度和减小双氧水的加入速度均可以提高贱金属的浸出率;但增大双氧水过量系数会导致金属氧化沉淀。在最优条件下,铜、镍、锑和铅的浸出率均大于99.0%,金和银的浸出率分别为0.16%和84.40%,浸出渣中金含量达到96.0%。浸出液冷却结晶过程会析出氯化铅,金和银的置换率均达到99.0%以上。该方法实现了富贵锑中贱金属有效分离和金高效富集的双重目的。 相似文献
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脱除铅阳极泥中贱金属的预处理工艺选择 总被引:1,自引:0,他引:1
提出碱性NaOH体系分步氧化浸出和盐酸浸出相结合的工艺预处理铅阳极泥,在碱性分步氧化浸出过程中,实现As的氧化溶解和Bi等金属的氧化沉淀,然后用盐酸溶解碱性浸出渣中的Bi,使贵金属富集在盐酸浸出渣中。结果表明:无论碱性直接浸出或酸性直接浸出都不能有效分离铅阳极泥中的有价金属;改变烘烤温度、延长空气氧化时间和改变碱性加压氧化浸出温度都不能实现有价金属的分步分离。当双氧水用量大于0.2以后,碱性浸出过程As的浸出率达到92%以上,碱性浸出渣盐酸浸出时,Bi和Cu的浸出率分别达到99.0%和97.0%,且残余的As不溶解,实现铅阳极泥中有价金属分步分离的目的。 相似文献
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《中国有色金属学会会刊》2019,(5)
为了生产适合冶炼的铂族精矿,提出一种氧压浸出-浮选联合工艺处理金宝山铂族矿物。结果表明:氧压浸出条件(矿物粒度、搅拌速度、液固比以及木质素磺酸钙用量)对浸出过程中贱金属(铜、铁和镍)浸出率以及浮选工艺中铂族金属(铂和钯)的回收率产生明显影响。浸出过程中贱金属硫化矿物的完全溶解导致铂族金属浮选降低了浮选载体的数量,降低浮选过程中铂族金属回收率。综合考虑贱金属浸出率和铂族金属回收率,确立如下最佳工艺条件:精矿粒度-0.043 mm占有率为73%,搅拌速度为400 r/min,液固比为10 mL/g,木质磺酸钙用量为0.6 g。最佳工艺条件下,铜、镍和铁的浸出率分别为87.6%、87.6%和90.3%。采用浮选工艺处理浸出渣获得浮选精矿铂族金属品位为420 g/t。 相似文献
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贾铃 《有色金属再生与利用》2011,(4):61-63
在盐酸介质中加入氯酸钠和氯化钠使银电解阳极泥中的金、铂、钯等贵金属和铜、铅、铋等贱金属被氧化浸出进入溶液中,而银生成氯化银进入渣中,通过加入氢氧化钠溶液调整浸出液的pH值,使铅、铋等水解除去,然后加入草酸使净化后液中的金被还原,金粉经盐酸、硝酸、氨水洗涤后铸锭,产出的金锭符合国家1#金锭的标准。 相似文献
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A leaching process was established based on the ability of platinum-group metals to form stable chloro-complexes in acidic
chloride solutions. Industrial catalyst losses were examined for the recovery of platinum, palladium, and rhodium by leaching
with a mixture of sulfuric acid and sodium chloride to avoid using aqua regia or autoclave conditions. Extraction of platinum
and rhodium in 60% H2SO4 at 135°C steadily increased with increasing NaCl concentrations reaching 95% and 85%, respectively, at 0.1 M NaCl after two
hours. By comparison, palladium was dissolved more quickly but also reached 85% under the same conditions. Extraction of each
metal increased with temperatures up to 125°C but plateaued at higher temperatures. Similar behavior was observed with increasing
H2SO4 concentrations up to 60%. More than 99% extraction of each metal was obtained after ten hours using 0.1 M NaCl and 60% H2SO4 at 125°C.
For more information contact Mohamed Hesham Hassan Mahmoud in the Extractive Metallurgy Department, Central Metallurgical
R&D Institute, P.O. Box 87, Helwan, Cairo, Egypt; (202)5010642, Ext. 213; Fax (202)5010639; e-mail mheshamm@hotmail.com 相似文献
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Alex Luyima Honglan Shi Lifeng Zhang 《JOM Journal of the Minerals, Metals and Materials Society》2011,63(8):38-41
The leaching behavior of most metals present in printed wiring boards is evaluated, aiming at its recycling by hydrometallurgy.
Two leaching reagents (nitric acid and aqua regia) are compared. The effects of acid concentration, particle size of sample,
leaching time, and temperature are examined. The results reveal that small particle size and a combination of both nitric
acid and aqua regia are capable of dissolving most of the metals content of printed wiring boards. 相似文献
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铜阳极泥是铜电解精炼中的一种副产品,是回收贵金属的重要原料。以空气代替氧气为加恪气体,系统悁究了铜阳极泥加恪酸浸预处理工艺。悁究的影响因素包括硫酸浓度、空气分恪、浸出温度、浸出时间和液固比等。结果表明,在最优工艺条件下,铜的浸出率高达98%;碲、硒、银的浸出率分别为49%、13%、1%。试验数据表明:铜阳极泥经过加恪酸浸预处理,几乎所有的铜和部分的碲,能有效的从贵金属中分离出来,使贵金属得以富集。机理悁究表明:充分利用阳极泥中水溶性铜离子的自催化氧化作用,能有效提高铜的溶解速度。 相似文献
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Altansukh Batnasan Kazutoshi Haga Atsushi Shibayama 《JOM Journal of the Minerals, Metals and Materials Society》2018,70(2):124-128
This paper considers the issue of recycling of waste printed circuit boards (WPCBs) containing precious and base metals in appreciable amounts. High-pressure oxidative leaching (HPOL) with dilute sulfuric acid resulted in removal of a significant amount of base metals from a WPCB ash sample obtained by incineration at 800°C. The parameters investigated in the precious metal leaching from WPCB residue after HPOL included the sulfuric acid concentration, thiourea concentration, oxidant concentration, leaching temperature, and leaching time. Recovery of gold, silver, and palladium of 100%, 81%, and 13% from the WPCB residue sample was achieved by thiourea leaching under optimized conditions. The results show that the efficiency of precious metal dissolution from the WPCB sample using thiourea solution depended strongly on the concentration of both thiourea and oxidant. 相似文献