共查询到19条相似文献,搜索用时 46 毫秒
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<正> 一般废旧电缆的表皮和一部分较粗的电线均可以用轧辊轧开,回收铜和部分塑料,但电缆中的细线及大部分软导线、仪表软带等几乎无法处理。美国曾提出将废电线电缆切碎,再用溶剂浸泡后分选,还有人提出以有机溶剂将电线塑料溶解实现铜塑分离,而后再从溶剂中回收塑料,但由于技术 相似文献
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针对废线路板在收集与处置过程中,各区域存在跨地区协调性弱、处置能力不匹配等问题,使用最小距离最大流(MDMF)模型对废线路板跨区域最优流动路径及流量进行模拟,并对优化结果进行环境影响评价。结果表明:随着废线路板产生量逐年增加,根据模拟优化的跨区域回收路径,拥有典型废线路板处理技术的地区,如广东、湖北等都能达到其最大产能,且该条件下环境影响程度较小。本研究为废线路板回收系统的区域协调规划提供了理论支撑。 相似文献
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通过分析国内外处置废线路板技术的优缺点,提出了采用侧吹熔池熔炼技术协同处置废线路板,分析了该技术在处理废线路板等含铜多金属固废上的技术优势,详细描述了协同处置工艺流程、工艺特点及侧吹炉结构特征,侧吹熔池熔炼废线路板具有原料适应性强、能耗低、环境友好及金属回收率高等技术特点。 相似文献
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迄今为止,我国石油农药化肥等化工领域中用过的铜锌催化剂,大都当成垃垃废弃,有的倒入江河,有的用于铺路填坑。大厂一次卸下的废催化剂上百吨,小厂也有两吨多。国内目前尚未公开发表铜锌催化剂用后回收再用的报道。。由于用来制造催化剂的铜锌原料不仅量大而且要求纯度很高,为此,我们对合成甲醇使用过的铜锌铝系催化剂。回收再制进行了实验室和生产上应用的 相似文献
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用N902萃取废印刷线路板中的铜 总被引:1,自引:0,他引:1
以N902为萃取剂,从废弃印刷线路板氨性浸出液中萃取回收铜,研究萃取剂浓度、相比(O/A)、萃原液初始pH和时间对铜萃取率的影响。结果表明,室温下N902萃取铜最优条件为:萃取剂浓度15%、O/A=1∶2、料液初始pH=10、萃取时间2.5min。在此条件下Cu2+萃取率98.62%,用2mol/L硫酸溶液对负载有机相进行一级反萃4min,Cu2+反萃率达89.91%,其溶液可满足电积提铜的要求。 相似文献
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Hoang Long Le Jinki Jeong Banshi D. Pandey Jae-Min Yoo Trung Hai Huyunh 《Mineral Processing and Extractive Metallurgy Review》2013,34(2):90-104
Present paper focuses on the selective recovery of copper from the enriched ground printed circuit boards (PCBs) using leaching and solvent extraction. The metal-enriched ground sample obtained from the beneficiation of the sized PCBs in a laboratory scale column type air separator contained mainly 49.3% Cu, 3.83% Fe, 1.51% Ni, 5.45% Sn, 4.71% Pb, and 1.85% Zn. The leaching of the enriched sample with 3.5 mol/L nitric acid dissolved 99% copper along with other metals at 323 K temperature and 120 g/L pulp density in 1 h time. The composition of the leach liquor with wash solution was found to be 42.11 g/L Cu, 2.12 g/L Fe, 4.02 g/L Pb, 1.58 g/L Zn, and 0.4 g/L Ni. The McCabe–Thiele plot indicated the requirements of three counter-current stages for maximum extraction of copper from the leach liquor at pH 1.5 using 30, 40, and 50% (v/v) LIX 984 N at the phase ratios (A/O) of 1:3, 1:2, and 1:1.5, respectively. The counter-current simulation studies show the selective extraction of 99.7% copper from the leach liquor feed of 1.5 pH in three stages with 50% LIX 984 N at A/O phase ratio of 1:1.5. The stripping of copper from the loaded organic with sulfuric acid produced copper sulfate solution from which copper metal/powder could be recovered by electrolysis/ hydrogen reduction. 相似文献
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介绍了一种以废旧印刷电路板为原料经物理分选、NH3-(NH4)2SO4-H2O体系浸出铜、萃取提纯、H2SO4反萃得到CuSO4溶液,而后蒸发冷却结晶获得CuSO4.5H2O晶体,以此为原料制备超细铜粉的方法。制备超细铜粉的最佳试验条件为:先制备出Cu2O沉淀配制成100 mL悬浊液,在PVP加入量为6 g(200 mL溶液)、搅拌速度为400 r/min、NaH2PO2.H2O加入量是理论量的4倍,加料方式为将NaH2PO2.H2O分两次加入100 mL的Cu2O悬浊液中,50℃时加入40mL后以1.2℃/min的速度升温到75℃时加入剩下的60 mL,用2 g/L的苯并三氮唑溶液浸泡清洗后的超细铜粉0.5 h进行表面改性,在此条件下制备的铜粉粒度均匀,结晶度高,无团聚现象,该超细铜粉可以用于多层功能陶瓷电容器(MLCC)的电极上。 相似文献
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ABSTRACT This study focuses on the recovery of valuable metals, such as gold, silver, and copper, from the printed circuit boards of waste computers, using physical separation followed by leaching methods. Characterization studies revealed that resins and glass fibers were attached as grain together with base and precious metals. A hammer mill was employed as a second stage crusher to disintegrate the different components of the printed circuit board, thus improving the selectivity and recovery of metals. Separation studies using a laboratory-scale shaking table showed that 33% of the feed was removed as a light product and 96.8% of Au, 96.7% of Ag, and 97.7% of Cu were recovered in heavy fraction. Leaching the light fraction using 3 M H2SO4 and 0.33 M HNO3 at 80°C for two h resulted in greater than 90% extraction of Cu. Au and Ag were dissolved at room temperature with a leaching solution of 0.2 M S2O3 2-, 0.02 M CuSO4, and 0.2 M NH3.H2O, which provided a recovery of more than 59% of Au and 98% of Ag within eight h. Direct leaching tests using optimized conditions were also implemented on the crushed sample, and 45% of Au, 87.6% of Ag, and 70.8% of Cu were extracted. 相似文献
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某厂铜阳极泥中铜的回收试验研究 总被引:1,自引:0,他引:1
本文针对某厂铜阳极泥中铜含量高、难溶的特点,经过二次焙烧二次浸出,铜浸出率达99%以上,硫酸铜结晶率〉90%,海绵铜置换率〉99%,铜总回收率〉99%,该方法具有经济和环境双重效益。 相似文献
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一种从废旧电路板中回收铜的新工艺 总被引:2,自引:0,他引:2
介绍了一种从废旧电路板中分离提取铜并产出超细铜粉的新工艺。首先采用物理分选法分离出含铜的重密度组分,之后采用氧化氨浸—溶剂萃取工艺获得CuSO4溶液,最后以次亚磷酸钠为还原剂,以PVP为保护剂和分散剂,采用二次还原法,获得粒度1.5μm左右的抗氧化铜粉。浸出阶段优化条件为:温度35℃,时间2h,氨水和硫酸铵起始浓度均为2mol/L,空气流量8m3/h,固液质量体积比1∶10。铜萃取及反萃阶段优化条件为:萃取剂Lix84,萃取剂体积分数50%,相比1∶1,TBP浓度0.1mol/L,常温,以500次/min的速度震荡3min;反萃取剂硫酸,浓度0.2mol/L。在优化条件下,浸出、萃取及反萃取阶段的铜提取率分别为96.67%、98.87%及93.34%,效果良好。 相似文献
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某金银冶炼厂环保工序产出的废水沉渣是一种复杂的含金物料,金质量分数约1 000 g/t,银质量分数约500 g/t,还含有其它杂质如铜、硫、炭等。本研究采用焙烧-硫酸预处理-氯化湿法工艺从其中回收金,金浸出率为97.95%,银浸出率为79.86%,效果令人满意。 相似文献
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研究了用硫酸从铜冶炼中和渣中浸出砷,并用FeS将浸出液中的砷转化为As2S3沉淀,使砷得到回收,中和渣得到有效处理。 相似文献