xinhai tanzania 1200tpd gold mineral processing plant, shandong xinhai mining technology & equipment inc. - xinhai
Tanzania 1200tpd gold mineral processing project has finished the installation and commissioning part recently, now has been put into operation, during the installation and commissioning process, Xinhai employees carry forward the work style of working hard and develop the rigorous attitude to guarantee high quality finishment of the work in short period. The production line has got anticipated recovery rate, Xinhai employees got highly appreciated from the customer.
Xinhai Tanzania 1200tpd gold mineral processing project is located in Africa,thus has big differences from domestic one in project management, construction technology,resource supply and work coordination.
Pictured above is the grinding and thickening panorama of the Xinhai Tanzania 1200tpd gold mineral process plant.Pictured right is a group photo from project site of Xinhai employees with the customer.
Mainly includes thickening,cyaninding and desorption electrosis parts.Main work of the installation and commissioning includes:
1.Install the equipment such as thickening,cyaniding,desorption electrosis system.2.Install the pipelines and operation platforms (exclude tailings pipelines of outdoors);3.The electric power, water supply and drainage.(exclude water supply from water source)
This project applys all slime cyanidation to leach gold,the ores mainly are sulfide ore and oxidized ore.Oxidized ore has grade of 2.4g/t,gold is the only valuable element that can be recovered and the all slime cyanidation get 93.75% recovery rate of gold;
Sulfide ore has grade of 10.7g/t,gold is the only valuable element that can be recovered and the all slime cyanidation get 91.58% recovery rate of gold;
Above is part of the desorption electrolysis system of the project,which is the core equipment of the all slime cyanidation.Pictured left is a panorama of desorption electrolysis system.Anions that can be easily adsorbed by activated carbon have been put into the desorption system to displace Au(CN)2- for the desorption of gold.Rich liquid from the desorption of loaded carbon can be recovered by ionization method to get solid gold.
Civil construction mainly includes factory building and equipment foundation construction.after the foundation construction work of thickening and leaching tank, the installation and construction of pipeline and electric instrument also should be finished.
Subsection hoisting leaching tank.Equipment like leaching tank and thickening belongs to thin-walled tank,to protect the deformation of non-standard equipment,the larger-diameter tanks will manufacture in China,and install at the project site.For smaller-diameter tanks,professional hangers will be used in the hoisting work.
organic wastewater treatment by a single-atom catalyst and electrolytically produced h 2 o 2 | nature sustainability
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The presence of organic contaminants in wastewater poses considerable risks to the health of both humans and ecosystems. Although advanced oxidation processes that rely on highly reactive radicals to destroy organic contaminants are appealing treatment options, substantial energy and chemical inputs limit their practical applications. Here we demonstrate that Cu single atoms incorporated in graphitic carbon nitride can catalytically activate H2O2 to generate hydroxyl radicals at pH7.0 without energy input, and show robust stability within a filtration device. We further design an electrolysis reactor for the on-site generation of H2O2 from air, water and renewable energy. Coupling the single-atom catalytic filter and the H2O2 electrolytic generator in tandem delivers a wastewater treatment system. These findings provide a promising path toward reducing the energy and chemical demands of advanced oxidation processes, as well as enabling their implementation in remote areas and isolated communities.
Chuang, Y.-H., Chen, S., Chinn, C. J. & Mitch, W. A. Comparing the UV/monochloramine and UV/free chlorine advanced oxidation processes (AOPs) to the UV/hydrogen peroxide AOP under scenarios relevant to potable reuse. Environ. Sci. Technol. 51, 1385913868 (2017).
Lyu, L., Zhang, L., Wang, Q., Nie, Y. & Hu, C. Enhanced Fenton catalytic efficiency of -CuAl2O3 by -Cu2+ligand complexes from aromatic pollutant degradation. Environ. Sci. Technol. 49, 86398647 (2015).
Costa, R. C. C. et al. Novel active heterogeneous Fenton system based on Fe3-xMxO4 (Fe, Co, Mn, Ni): the role of M2+ species on the reactivity towards H2O2 reactions. J. Hazard. Mater. 129, 171178 (2006).
Murayama, T. & Yamanaka, I. Electrosynthesis of neutral H2O2 solution from O2 and water at a mixed carbon cathode using an exposed solid-polymer-electrolyte electrolysis cell. J. Phys. Chem. C. 115, 57925799 (2011).
Liu, J., Zhang, T., Wang, Z., Dawson, G. & Chen, W. Simple pyrolysis of urea into graphitic carbon nitride with recyclable adsorption and photocatalytic activity. J. Mater. Chem. 21, 1439814401 (2011).
Part of this work was performed at the Stanford Nano Shared Facilities, supported by the National Science Foundation under award no. ECCS-1542152. Use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences under contract no. DE-AC02-76SF00515. Work at the Molecular Foundry was supported by the Office of Science, Office of Basic Energy Sciences, of the US Department of Energy under contract no. DE-AC02-05CH11231. The teratogenicity experiment was supported by NIH grant no. R35 GM127030.
J.X. and Y.C. conceived the idea. J.X. performed the experiments. X.Z. performed the EXAFS and STEM characterizations. Z.F. performed the teratogenicity studies. Z.L. synthesized the O-SP. W.H., Y.L. and Z.Z. performed the HR-TEM and EDS characterizations. D.V. and Y.L. helped with the HPLC and LCMS measurements. S.D. helped with the STEM characterizations. K.W. synthesized Cu-TMCPP. Z.L. and G.C. helped with quantification of H2O2. H.W. and Z.Z. helped with electrochemistry experiments. J.X. and Y.C. wrote the manuscript with input from all co-authors.
Xu, J., Zheng, X., Feng, Z. et al. Organic wastewater treatment by a single-atom catalyst and electrolytically produced H2O2.
Nat Sustain 4, 233241 (2021). https://doi.org/10.1038/s41893-020-00635-w
analysis of water transport in a high pressure pem electrolyzer - sciencedirect
This paper analyzes, through experimental data and a transport model, the water transported through the membrane under different operating conditions in a on a Proton Exchange Membrane (PEM) electrolyzer operating with a high-pressure gradient across the membrane from the cathode (high-pressure) side to the anode (nearly ambient-pressure) side. The phenomena involved in this movement are described and analyzed, with a focus on the electro-osmotic drag coefficient, neo. We have observed that the behavior of the hydraulic percolation determines the results obtained for the electro-osmotic drag, while the contribution of the water diffusion is negligible. In general, the cathode pressure significantly reduces the water transport (a positive effect). Also, operation at lower current density reduces the net electro-osmotic drag coefficient, ng; therefore, the best operation strategy for obtaining dried hydrogen at the cathode is to impose high cathode pressure and low current density.
tuning adsorption strength of co2 and its intermediates on tin oxide-based electrocatalyst for efficient co2 reduction towards carbonaceous products - sciencedirect
DFT calculations are performed to decipher the behaviors of SnO, SnO2 and Sn3O4 toward electroreduction of CO2.Sn3O4 possesses the lowest activation barrier for the formation of HCOOH.Flower-like Sn3O4 delivers a FEcarbonaceous of 97.7% and a partial current density of 16.6mA/cm2 at 0.9 VRHE.An onset overpotential of 190mV, the lowest reported thus far, is achieved on Sn3O4.The up-shifted electronic structure of Sn3O4 plays an essential role for the boosted production of carbonaceous products.
The catalytic performance of electrocatalyst on carbon dioxide reduction reaction (CO2RR) heavily depends on the adsorption strength of intermediates and electronic structure. For the first time, Sn3O4 is identified as the most effective electrocatalyst for CO2RR among SnOx-based materials towards carbonaceous products by density functional theory calculation and experimental work. An optimized adsorption strength of intermediates is achieved on Sn3O4 owing to the originally synergistic Sn2+ and Sn4+ effect resulted from the unique electronic structure of Sn3O4. Additionally, with an up-shifted band structure, Sn3O4 imparts the moderate adsorption energies of *H and HCOO* intermediate, which suppresses the hydrogen evolution reaction and promotes the intrinsic catalytic efficiency of CO2RR. The synthesized Sn3O4 electrocatalyst delivers a carbonaceous faradic efficiency of 97.7% with a partial current density of 16.6 mA/cm2 at 0.9 VRHE. The corresponding overpotential of 190 mV is lower than the values from most of the reported SnOx-based electrocatalysts.
Theoretical calculations prove that the Sn3O4 lowers the activation barrier of producing HCOOH benefitting from moderate adsorption energies of intermediates (HCOO* and *H) among SnO, SnO2 and Sn3O4. As a result, a faradic efficiency for carbonaceous products over 97.7 % at 0.9 VRHE is obtained on the Sn3O4 electrocatalyst. This combination of rigorous experimental and theoretical studies clearly elucidates the advantages of Sn3O4 and sheds light on the rational design of SnOx-based electrocatalysts with special electronic structure for efficient CO2RR utilizations.
functionalized lignin-based magnetic adsorbents with tunable structure for the efficient and selective removal of pb(ii) from aqueous solution - sciencedirect
Lignin-based magnetic materials with tunable components were prepared.Magnetic materials showed efficient and selective adsorption performance toward Pb(II).The adsorption efficiency could still maintain over 85% after 5 cycles.The Pb(II) adsorption was dominated by chemical interactions.
With the increasing concern in sustainable development and environmental governance, the biomass-based magnetic materials containing sufficient active sites and regular structure can be regarded as the high-performance adsorbents for removal of heavy metal pollutants from wastewater. In this study, we reported the tunable covalent binding of lignin onto amine-functionalized magnetic nanoparticles (AMNP) using cyanuric chloride as a chemoselective cross-linker. The chemical structures, morphologies, and magnetic properties of the synthesized lignin-based magnetic adsorbents ([emailprotected] and [emailprotected]) were comprehensively characterized. Batch adsorption experiments were conducted to investigate various effecting factors, including pH, contact time, solution concentration and temperature. With the higher component ratio of AMNP/lignin, [emailprotected] displayed higher adsorption affinity (qmax=111.23mg/g) and selectivity towards Pb(II) than [emailprotected] (qmax=81.97mg/g). The adsorption kinetics agreed well with the pseudo-second-order kinetic model, and the thermodynamic adsorption behaviors were found to be an endothermic and spontaneous process. In addition, the presence of magnetic cores in the network facilitated the fast recovery of both two magnetic adsorbents after the adsorption process, owing to the good superparamagnetic properties for [emailprotected] (40.06emu/g) and [emailprotected] (26.95emu/g). Furthermore, the coreshell magnetic adsorbents also showed superior stability even in an acidic solution, of which the removal efficiency could well maintain over 85% after 5 cycles. This work provides a facile strategy for the design and synthesis of lignin-based adsorbents with flexible nanoparticles as a building block for the potential application prospects in Pb(II) removal from wastewater.
cu-catalytic generation of reactive oxidizing species from h2 and o2 produced by water electrolysis for electro-fenton degradation of organic contaminants - sciencedirect
A cheap Cu/C catalyst was synthesized for electro-Fenton process.Cu/C catalyzed the electrolytic degradation of phenol.OH radicals were the dominant ROS for phenol degradation.Degradation under different conditions was investigated.The performance of Cu/C was lower compared with Pd/C.
A novel Pd-based electro-Fenton process has recently been developed to degrade organic contaminants in wastewaters and groundwater. However, the high cost of Pd catalyst limits the application of this process. In this study, Cu supported on bamboo charcoal (Cu/C) was synthesized to evaluate the feasibility of substituting Pd catalysts. Using phenol as a probe organic contaminant, the performance of Cu/C catalyst was evaluated for the electro-Fenton degradation of phenol in a typical undivided electrolytic system. The electrochemical degradation of phenol in the presence of Cu/C was significant, following a pseudo-first-order kinetics with rate constant (k1) of 0.008min1. The addition of Fe2+ remarkably enhanced the degradation (k1=0.012min1). H2O2 and OH were validated as the reactive oxidizing species (ROSs), and OH was the main ROS contributing to phenol degradation. The as-synthesized Cu/C consisting of Cu, CuO and Cu2O could catalyze the production of H2O2 from chemisorbed H2 and O2 as well as the decomposition of H2O2 to OH. Particularly, the addition of Fe2+ facilitated the transformation of H2O2 to OH. Phenol degradation increased with increasing the current from 5 to 50mA and decreased with the further increase to 100mA. The degradation improved with the increase in Cu loadings and the decrease in solution pH. The presence of NaNO3, Na2SO3 or Na2S inhibited the degradation, while the presence of NaCl increased the degradation. Although the activity of Cu/C is much lower than that of Pd/C for phenol degradation, the cost of Cu/C is much lower.