- منطقة بودونغ الجديدة ، شنغهاي ، الصين .
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Recovery of spent tungsten slurry for reuse in CMP process. • Membrane separation based on ultrafiltration using different membrane materials. • 50 kDa PS membrane gave 92% retention of silica particles and 42% retention of tungsten.
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A critical review of the current status of tungsten resources, of state-of-the-art processing technology and of product development in India vis-a-vis the world scenario is presented. An attempt has been made to identify technology gap areas requiring attention.
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emission of arsenic into nature environment during tungsten extraction process is a serious environmental issue [, 65]. At present, scholars have done a great amount of researches on the ecient extraction of tungsten in a unit process, including tungsten minerals decomposition [7, 8], purica-tion and transition of leaching solution [, 109].
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Recently, several novel laboratory processes have been proposed in order to increase the tungsten recovery and adapt the strict environmental requirements, including inorganic acid leaching with ... The leaching system can be recovered by absorbing gaseous NH 3 and CO 2 from the evaporation-crystallization step and recovery …
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Recycled tungsten resources mainly come from all kinds of scrap cemented carbide, tungsten alloy, etc. Therefore, scrap cemented carbide has become the focus of attention. The methods of tungsten recovery from scrap cemented carbide are mainly categorized into long-process recovery method and short-process recovery method.
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A process combining chloride leaching and electrowinning was proposed for selective recovery of bismuth from Pb Bi slag. Thermodynamic analyses indicated that there exists a significant difference in solubility between PbSO 4 and Bi 2 …
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China is very rich in tungsten and tin resources, but most of them are finely disseminated with gangues, and thus, fine grinding is required for effective separation, which results in the abundant production of ultra-fine tungsten and tin values into slimes and tailings. The SLon centrifugal separator is highly effective in recovering ultra-fine …
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The recovery of tungsten from the rejects, tailings, old dumps and recovery of very finer values in the ranges of 500-1000 ppm present in the granite rock are recovered satisfactorily compared to those results obtained by processing the ores anywhere in the world.
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In the above-mentioned hydrometallurgical process for recovering tungsten, the recovery efficiency of tungsten is all lower than 80%, and the obtained residue is still classified as hazardous solid waste due to the enrichment of arsenic.
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The separation and extration of tin and tungsten from wolframite – scheelite mixed ore with high tin content is urgently needed given the increasingly exhaustion of the high-grade tungsten ore. However, current tungsten hydrometallurgy technologies suffer from considerably drawbacks, such as low recovery of tin, high …
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The process developed based on this work has the characteristics of environmental friendliness, high valuable metal recovery, and high product purity, providing a reference technical method for the synergistic treatment of waste SO 2 flue gas with spent LIBs and the deep purification of impurities in spent LIBs.
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This article presents results of the studies on development of viable process route for quantitative recovery of tungsten and tin values occurring together in the form of a multimineral concentrate of wolframite, scheelite, and cassiterite. The investigations were carried out using a tin–tungsten multimineral ore from Kyrgyzstan (Central Asia).
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Efficient electrochemical dissolution of tungsten carbide is crucial to obtain an efficient recovery of cemented carbide via molten salt electrolysis. Based on the interfacial process, the dissolution mechanism of tungsten carbide in oxygen-containing molten salt
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With most high-quality tungsten ores being exhausted, the enhancement of low-grade scheelite concentrates processing has attracted a great deal of attention. The objective of this study is to develop a method to maximize the recovery tungsten and molybdenum from a low-grade scheelite via a new acid leaching process followed by …
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Semantic Scholar extracted view of "A green process for arsenic removal and tungsten recovery from tungsten residue waste: focused on the separation and recovery of arsenic and tungsten via solvent extraction followed by H2S precipitation" by Xinsheng Wu et al.
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Tungsten is a scarce and valuable metal with a wide range of applications. Currently, the recovery of tungsten from scheelite concentrates involves the use of strong acids, alkalis, and/or high temperatures (roasting). Deep Eutectic Solvents (DES) are proposed as an environmentally friendly alternative for the leaching process aiming to …
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Taking into account the reduction of alkali consumption and recovery of tungsten and arsenic, the leach solution was recycled. The closed-loop strategy shows great promise for the harmless treatment and tungsten recovery of TRW on an industrial scale to promote circular economy and environmental protection.
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