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1.
针对蓝辉铜矿、铜蓝和硫砷铜矿开展了表面选择性氧化浮选分离研究,并通过矿物表面接触角变化及XPS表面分析,阐明了3种矿物表面选择性氧化反应机制。结果显示,氧化剂次氯酸钙和高锰酸钾均可有效抑制蓝辉铜矿和铜蓝上浮,但对硫砷铜矿可浮性无影响; 在丁铵黑药作用下,硫砷铜矿和蓝辉铜矿接触角均达到90°,经次氯酸钙氧化后,蓝辉铜矿接触角降至15°~30°,硫砷铜矿接触角仍高于86°; XPS分析结果表明,次氯酸促进了蓝辉铜矿表面的氧化,硫元素被氧化为SO42-,以CuSO4形式覆盖在矿物表面,增加了表面亲水性,而硫砷铜矿表面As、Cu和S元素并未发生明显的氧化反应,矿物表面维持较高的疏水性。次氯酸钙实现了蓝辉铜矿与硫砷铜矿表面选择性氧化,强化了两者的浮选分离。  相似文献   
2.
    
Many researchers found that the Fe2+ together with less amount of Cu2+ can accelerate the leaching of chalcopyrite. In this work, the leaching of chalcopyrite with Cu2+ was investigated. The leaching residuals were examined by Raman spectroscopy. Based on the leaching experiments, the chemical equilibrium in solution was calculated using Visual MINTEQ. The results showed that the Fe in chalcopyrite lattice was replaced by Cu2+; therefore, the chalcopyrite transformed into covellite. Furthermore, the formation of chalcocite occurred when Fe2+ and Fe3+ were added to the solution containing Cu2+. The copper extraction increased with a decrease of the initial redox potential (or the ratio of Fe3+/Fe2+).  相似文献   
3.
对中条山铜矿峪铜矿的低品位含铜矿石进行了可浸性研究,试验结果表明,经过86h的浸出,单独使用硫酸时铜的浸出率只有68.98%;若加入3.14g/L的Fe3+,可使铜的浸出率提高到74.34%;若再加入5g/L的NaCl助浸,铜的浸出率则可提高到79.98%。化学物相和光学显微图像分析表明,氧化铜的浸出很快就可完成,辉铜矿和斑铜矿也以较快的速度降解为蓝辉铜矿和铜蓝,而铜蓝的浸出反应比较缓慢。  相似文献   
4.
    
A therapeutic carrier in the second near‐infrared (NIR) window is created that features magnetic target, magnetic resonance imaging (MRI) diagnosis, and photothermal therapy functions through the manipulation of a magnet and NIR laser. A covellite‐based CuS in the form of rattle‐type Fe3O4@CuS nanoparticles is developed to conduct photoinduced hyperthermia at 808 and 1064 nm of the first and second NIR windows, respectively. The Fe3O4@CuS nanoparticles exhibit broad NIR absorption from 700 to 1300 nm. The in vitro photothermal results show that the laser intensity obtained using 808 nm irradiation required a twofold increase in its magnitude to achieve the same damage in cells as that obtained using 1064 nm irradiation. Because of the favorable magnetic property of Fe3O4, magnetically guided photothermal tumor ablation is performed for assessing both laser exposures. According to the results under the fixed laser intensity and irradiation spot, exposure to 1064 nm completely removed tumors showing no signs of relapse. On the other hand, 808 nm irradiation leads to effective inhibition of growth that remained nearly unchanged for up to 30 d, but the tumors are not completely eliminated. In addition, MRI is performed to monitor rattle‐type Fe3O4@CuS localization in the tumor following magnetic attraction.  相似文献   
5.
The bioleaching of bornite with mixed moderately thermophilic culture at 50 °C was investigated. The intermediary species formed during the leaching of bornite were characterized by XRD and XPS. In addition, the evolution of Cu-state during leaching of bornite was further studied by applying φh-pH diagram and cyclic voltammetry. The results showed that the bornite was more likely to be leached at high redox potential. Furthermore, the intermediary sulfides, such as isocubanite, covellite, chalcopyrite, disulfide, and polysulfide, were formed in the course of bornite dissolution. The Cu 2p photoelectron spectrum revealed that the valence of copper in bornite and intermediary sulfide formed in the dissolution of bornite is +1. The bornite and chalcopyrite can be converted into each other, and both can be further converted to covellite and/or chalcocite.  相似文献   
6.
    
The surface characteristics, collector adsorption, and flotation response of covellite in the presence of NaClO and FeCl3 were investigated using micro-flotation tests, X-ray photoelectron spectroscopy (XPS), time-of-flight secondary ion mass spectrometry (TOF-SIMS), and contact angle measurements. The micro-flotation test results indicated that covellite was effectively inhibited by the presence of NaClO and FeCl3. However, the dosages of these depressants were large, and the conditioning time was long. The results of the XPS and TOF-SIMS analyses indicated that NaClO could oxidize the covellite surface and reduce the active sites of Cu. Oxidation products, including CuO and Cu(OH)2, were generated on the covellite surface. After the addition of FeCl3, the precipitation of iron hydroxide on the covellite surface increased the content of hydrophilic species on the mineral surface. Thus, the adsorption of ammonium dibutyl dithiophosphate on covellite surface was prevented, which reduced the floatability of the covellite.  相似文献   
7.
铜蓝浸出化学动力学研究   总被引:1,自引:0,他引:1  
模拟生物堆浸工艺条件,在硫酸铁酸性介质体系下,针对浸出温度、氧化还原电位和pH进行铜蓝化学浸出动力学试验研究。结果表明,硫酸铁酸性浸出铜蓝符合典型的缩核模型,速率受表面化学反应控制,而非扩散控制,表观活化能48.94kJ/mol。铜蓝的浸出率与温度和氧化还原电位呈正相关,pH对铜蓝浸出的影响微弱。在初始Fe3+浓度9.2g/L、Fe2+浓度3.0g/L、初始pH=1.00±0.05、氧化还原电位恒定在(720±10)mV(vs.SHE)、40℃条件下浸出288h,铜蓝的浸出率达到42.17%。  相似文献   
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9.
在硫酸铁酸性介质体系下,为揭示次生硫化铜矿堆浸过程中铜蓝与黄铁矿的浸出过程,利用纯矿物进行浸出模拟试验。纯矿物电位控制试验结果的化学动力学分析表明:铜蓝与黄铁矿浸出速率受表面化学反应控制,500mV(vs.Ag/AgCl)浸出条件下,黄铁矿浸出速率的提升量比铜蓝高出1倍,黄铁矿对电位表现出更强的相关性。结合低品位次生硫化铜矿生物浸出生产实际,进行了实际矿石柱浸验证试验,电位调控能使铁浸出率最高降低2个百分点,控制电位浸出的方式为次生硫化铜矿生物堆浸的过程控制提供了参考。  相似文献   
10.
在系统采样和岩矿鉴定的基础上,对紫金山铜金矿床Cu-S矿物变化规律进行了详细的研究,发现从矿床浅部到矿床深部,铜蓝的形态从较为细小的针柱状、棉絮状逐渐变化为较大的板柱状;而Cu-S矿物组合表现为浅部以蓝辉铜矿为主,深部以铜蓝为主。它们分别有力地说明铜矿体并不是次生富集成因,而是原生热液成因;矿床深部的氧逸度和硫逸度均高于矿床浅部。因此可以推测在现在已见矿床底部不远处还有斑岩型矿床的找矿潜力。  相似文献   
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