| 1. |
- Guo, Lijie, et al.
(author)
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Industrial practice on optimizing tailings composition combined with ore concentration processes
- 2017
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In: 12th International Conference on Mining with Backfill 2017, Minefill 2017. - Englewood, CO : Society for Mining, Metallurgy and Exploration. - 9781510835818 ; , s. 69-79
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Conference paper (peer-reviewed)abstract
- Cemented paste backfill (CPB) is increasingly applied in underground mines world-wide and has a broad prospect considering its benefits in environmental protection and ground control. During the paste production, a well-graded aggregate is critical for the achievement of CPB. Mine tailings from the outcome of ore-dressing plant are commonly used as the fill aggregate. However, it is difficult to obtain an ideal particle size distribution for the mine tailings which are roughly mixed with final residuum in ore concentration processes. In this study, a novel industrial method is proposed to select fill aggregates from different parts of ore-dressing processes. With combined design of concentration plant and backfill plant, the tailings with desired particle sizes and proportions during the mineral processing are chosen to produce CPB without disturbing the regular ore concentration. The problem of passively accepting final tailings from ore-dressing plant has been improved
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| 2. |
- Huang, Dan, et al.
(author)
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Interface of Sn-doped AgAlTe2 and LiInTe2 : A theoretical model of tandem intermediate band absorber
- 2021
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In: Applied Physics Letters. - : AMER INST PHYSICS. - 0003-6951 .- 1077-3118. ; 118:4
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Journal article (peer-reviewed)abstract
- Designing a new absorber to overcome the Shockley-Queisser limit for single-junction solar cells is of great importance for solar cell advancements. Here, a theoretical model of tandem intermediate band absorber is proposed based on the interface of Sn-doped AgAlTe2 and LiInTe2. Sn-doped AgAlTe2 and LiInTe2 are imminent to produce ideal heterojunctions as they possess similar lattice constants and the type-II band offset, providing an approach to overcome the Shockley-Queisser limit.
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| 3. |
- Jia, Qi, et al.
(author)
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Effects of Fine Content, Binder Type and Porosity on Mechanical Properties of Cemented Paste Backfill with Co-Deposition of Tailings Sand and Smelter Slag
- 2016
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In: Electronic Journal of Geotechnical Engineering. - : Mete Öner. - 1089-3032. ; 21:20, s. 6971-6988
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Journal article (peer-reviewed)abstract
- Mine backfilling is a process where the underground voids resulted from mining are filled with waste materials. The potential of co-depositing iron sand produced from smelting process with tailings sand was investigated in the present study. Different amounts of iron sand were mixed with the tailings sand to prepare cemented paste backfill (CPB) samples. Two types of binders were used. Uniaxial compression tests were performed for the CPB samples after 28 days of curing. The porosities of the samplers after curing were calculated to correlate the porosity with the uniaxial compression strength, UCS. Results from uniaxial compression tests showed that the amount of iron sand and the type of the binder influences the UCS, as well as content values of fines and porosity. These results demonstrated the possibility for a part of Fe-sand to be deposited together with the tailings sand to increase UCS values for the CPB samples, which will be beneficial for both mining operation and environmental protection.
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| 4. |
- Xue, Chuang, et al.
(author)
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Bridging chemical- and bio-catalysis : high-value liquid transportation fuel production from renewable agricultural residues
- 2017
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In: Green Chemistry. - : Royal Society of Chemistry. - 1463-9262 .- 1463-9270. ; 19:3, s. 660-669
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Journal article (peer-reviewed)abstract
- Catalytic conversion of lignocellulosic biomass to high-value transportation petrol, jet and diesel fuels is of great importance to develop versatile renewable energy and boost the rural economy, thus it is receiving worldwide attention. However, the state-of-the-art processes still suffer from a low efficiency in yield and productivity, which hinders the progress of its commercialization. Thus, it is essential to explore the consolidated catalytic reaction and refinery process. Here we report an advanced approach/process that could continuously produce long-chain (C-5-C-15) ketones from lignocellulosic biomass in a cascade mode by integrating several bio- and chemical catalysis reactions/processes, which exhibits a high efficiency and stable conversion rate. This technology consolidated the acetone-butanol-ethanol (ABE) fermentation, palladium catalyzed alkylation and in situ product recovery, allowing the catalytic reaction to proceed consistently and smoothly. The remarkable conversion properties are mainly attributed to the excellent compatible linkage of chemical catalysis with biosynthesis and process design to stabilize the Pd catalytic reaction. This validated strategy for the rational process design and integration of chemical-and bio-catalysis offers great demonstration in producing high-value transportation biofuels derived from agricultural residues.
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| 5. |
- Zheng, Juanrong, et al.
(author)
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Study on the Strength Development of Cemented Backfill Body from Lead-Zinc Mine Tailings with Sulphide
- 2018
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In: Advances in Materials Science and Engineering. - : Hindawi Publishing Corporation. - 1687-8434 .- 1687-8442. ; 2018
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Journal article (peer-reviewed)abstract
- The unconfined compressive strength (UCS) development of cemented backfill materials for lead-zinc mine tailings with sulphide was studied. The results showed that the UCS of the cemented backfill body with ordinary Portland cement (OPC) as binder decreased in the later curing days, regardless of particle size. Under the same conditions, the higher the OPC content, the higher the UCS of the cemented backfill body, and the UCS of the cemented backfill body began to decrease at the longer curing days. Under the same conditions, the finer the tailings, the lower the UCS of the cemented backfill body at each age, and the UCS of the cemented backfill body began to decrease at the earlier curing age. X-ray diffraction analysis (XRD) showed that the reduction of the UCS of the cemented backfill body was related to the formation of an expansive substance (expansive gypsum) in the cemented backfill body, which led to the cracking of the test sample. In the cemented backfill materials of coarse tailings of lead-zinc mine, the composite binder formed by OPC and calcined kaolin (CK) containing metakaolin was used; the amount of calcium hydroxide, the hydration product of cement, was reduced or eliminated due to the pozzolanic reaction of metakaolin; and the amount of expansive gypsum was reduced or eliminated, so the UCS of the cemented backfill body increased within 360 days of curing.
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