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1.
C. Liu L. B. Zhang C. Srinivasakannan J. H. Peng T. Q. X. Le 《Canadian Metallurgical Quarterly》2017,56(1):1-9
In this paper, jarosite residue (JR) blended with concentrated H2SO4 was subjected to a process comprising microwave roasting and water leaching. The effects of H2SO4/JR weight ratio, microwave roasting temperature and time, water leaching conditions on the recovery of Fe, Zn, In, Cu, Cd, Ag and Pb were investigated utilising a series of experiments.Based on energy conservation and environmental protection, optimum conditions for metals recovery from JR were determined as: H2SO4/JR weight ratio?=?0.36, microwave roasting temperature, 250°C; roasting time, 30?min; leaching temperature, 50°C; leaching time, 1?h; and liquid–solid ratio, 4:1 (mL/g), thus, the extraction of Fe, Zn, In, Cu, Ag and Cd were 89.4, 80.7, 85.1, 90.7, 61.3 and 48.8% respectively, while the Pb was concentrated in the final residue. Scanning electron microscope-energy dispersive spectrometer (SEM-EDS) patterns were used to characterise and analyse the transformation of valuable metals in the residue after roasting and leaching. 相似文献
2.
铁矾法从富铟高铁硫化锌精矿加压浸出液中沉铟研究 总被引:1,自引:0,他引:1
研究利用黄钾铁矾法从富铟高铁加压浸出液中沉铟的影响因素,并与黄铵铁矾法沉铟做比较。结果表明,在相同条件下,黄钾铁矾法具有更大的沉铟能力,且所需要的时间为3 h,远少于黄铵铁矾法沉铟所需要的时间。黄钾铁矾法沉铟最佳工艺条件:pH=1.73~1.75,温度96~98℃,铁铟摩尔比大于200,反应时间3 h,添加晶种,晶种添加量为理论生成铁矾量的1.5倍时,黄钾铁矾法沉铟率高达97%以上,铁的沉淀率也达到98%左右,为后续电积Zn提供了合格的浸出液。 相似文献
3.
The effect of water salinity on the reactions occurring during pressure acid leaching of an arid-region laterite ore, using hypersaline water, seawater, sub-potable water and tap water, is examined. Particular emphasis is placed on the mineralogy of the residue and its implications with regard to residue volume/mass, overall acid consumption and nickel extraction. Analysis of a pressure acid leach residue by electron microprobe indicates that the residual nickel is present in phases that contain silicon and varying concentrations of aluminium, but are deficient in sulphur. Incomplete extraction of nickel from the ore may not be attributed to any one mineral phase. 相似文献
4.
本文研究了低污染铁矾法炼锌工艺过程,并将研究结果同澳大利亚Risdon厂的结果进行对比,讨论了低污染铁矾法炼锌的效益和铅、银回收。 相似文献
5.
M. Kerolli‐Mustafa I. Bačić L. Ćurković 《Materialwissenschaft und Werkstofftechnik》2013,44(9):768-773
The aim of this work was to identify and characterize three samples of jarosite process tailing waste in Mitrovica, Kosovo, using Raman and Fourier transform infrared (FTIR) spectroscopy. The identification is made based on the assignment of bands in the Raman and FTIR spectra. Both Raman and FTIR spectra show the fundamental stretching and bending vibration mode of SO42–, OH– and NH4+ groups. The results obtained by the means of Raman and infrared spectroscopy are compared with cited reference data in order to sum the analysis of vibrational spectra. 相似文献
6.
为探索出红土镍矿杂质Fe高附加值利用的研究,以红土镍矿的硫酸铵焙烧熟料溶出液作为研究对象,以NH4HCO3作为造矾剂制备黄铵铁矾,矾水解后获得锂离子电池正极材料LiFePO4的原料Fe2O3,Fe2O3中加入Li2CO3、磷酸二氢铵NH4H2PO4及蔗糖煅烧制备出锂离子电池正极材料LiFePO4/C。获得最佳造矾条件为:反应时间4 h、反应温度95℃、终点pH值2.5、搅拌速度400 r/min,除铁率在98.35%以上,并采用XRD、SEM和化学分析手段对黄铵铁矾进行了表征;煅烧温度750℃、煅烧时间10 h制备的片状磷酸铁锂在0.1C倍率下的首次放电比容量164.12 mAh/g,0.1C、0.5C、1C、2C、5C倍率下循环10周的容量保持率较颗粒状磷酸铁锂高,表明片状磷酸铁锂有较好的电化学性能。由红土镍矿中的铁元素合成了高附加值锂离子电池LiFePO4正极材料,为红土镍矿资源高效、综合利用提供新技术及理论支持。 相似文献
7.
The residence time distribution (RTD) of the liquid phase and the mineralogical characterization of the biooxidation of refractory gold mineral was studied in a continuous stirred tank reactor. The latter was achieved using a native mixed culture of acidophilic mesophiles. The RTD was assessed using a mathematical model of stirred tanks in parallel. The oxidation of sulfide and the phases generated through the biooxidation process were evaluated via X-ray diffraction (XRD).The results indicated that the experimental RTD fit to the model. The reactor has a high tendency to behave as a completely mixed reactor. However, the mixed flow inside the reactor has disturbances such as by-pass and dead zones. The estimated mean residence time for the model was approximately 36% greater than the theoretical residence time. It was probably caused by the delay in the outflow of the tracer due to gas hold-up, foaming at the top and the design of the reactor outlet structure. The XRD outcomes showed that the oxidation of arsenopyrite was greater than that of pyrite. Similarly, the formation of jarosite and brushite was observed. It was concluded that the dead zones could increase the probability of jarosite precipitations. 相似文献
8.
本文分析了银在焙烧、浸出和沉矾过程中的行为。铁矶渣中95%的银来自沉矾中和剂焙烧料。采用低污染黄钾铁矾法是提高银回收率的有效途径。 相似文献
9.
Dora Nava 《Electrochimica acta》2006,51(25):5295-5303
The dissolution mechanism of chalcopyrite, and the potential range in which its passivation phenomenon takes place, were studied on carbon paste electrodes with chalcopyrite (99.46% purity, +300 mesh, 53 μm size) (CPE-CP) in 1.7 mol/dm3 H2SO4. A sequence of anodic potential pulses was applied to the CPE-CP to characterize its electrochemical behavior. Copper ions, dissolved by the potential pulses, were determined using a mercury film electrode (MFE) and the anodic stripping voltammetry (ASV) on a vitreous carbon disk. In addition, the modified surface of CPE-CP was characterized, before and after the potential pulses, by cyclic voltammetry (CV). The characterization of the final surface state of each electrochemically modified CPE-CP and the amount of dissolved copper showed five potential regions where the chalcopyrite dissolution mechanism changed. The initial dissolution occurs at 0.615 V ≤ Eanod < 1.015 V versus SHE forming a non-stoichiometric polysulfide (Cu1−rFe1−sS2−t). The absence of copper ions in the solution indicates a passive sulfide. However, at 1.015 V ≤ Eanod < 1.085 V versus SHE, the passive product decomposes forming porous layers of non-stoichiometric polysulfide (Cu1−xFe1−yS2−z) that allow the diffusional transport of charged species and the dissolution of the mineral. In the region of 1.085 V ≤ Eanod < 1.165 V versus SHE, formation covellite (CuS) was identified. At E > 1.165 V versus SHE, CuS is unstable and gives rise to complete dissolution of the chalcopyrite. Due to the experimental conditions, the mineral dissolution is inhibited by possible jarosite precipitation. 相似文献
10.
分析了铁矾渣物相组成,对铁矾渣综合利用方法进行了阐述,分析了高温焙烧分解、酸法浸出、碱法浸出工艺的特点、铁矾渣处理新思路以及工业化应用情况。建议根据各种废弃渣的特性,有效利用其资源,与铁矾渣进行协同处理,有利于实现无害化、资源化、减量化处置铁矾渣等其他废弃渣。 相似文献