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3 ·The results indicate that SHCP P has significant potential for industrial applications in the selective recovery of REEs from tailing wastewater 99 % were purchased from Aladdin Biochemical Co Ltd China FTIR spectra of La and Desorption c Photographs of the synthesis at small scale 0
·Nevertheless existing studies are still inadequate in many ways Firstly there are insufficient reliable data that could reflect the fundamental feature of TPs in China and the amounts of TPs in China are still uncertain Table 1 Secondly few studies examined the tailings wastes across the entire China but merely reported regional issues in Jiaodong peninsula
·In March 1992 cyanidation heap leaching tests of gold were carried out at the mine and the first batch of gold was produced in July 1992 which is the first operation of gold heap leaching in a high rainfall region in China In 2009 the gold production reached a peak at an annual output of 18 059 kg with average grade of g/t
·It can be seen from Table 1 that the main valuable element for recovery in the tailings is gold which has the gold grade of g/t Table 2 showed that the gold mainly exists in the occluded gold in which % % and % of gold are encased in the hematite sulfide mineral and silicate gangue mineral respectively The occluded gold is
·The extensive utilization of primary mineral resources has led to the depletion of high grade deposits and a shift toward lower grade deposits Simultaneously the growing production of mining waste has created a pressing need for the mining industry to tackle mounting environmental issues [5] [6]
·A combination of several different circular economy approaches reduce reprocess upcycle downcycle and dispose for future is needed to manage the waste streams in mining in a holistic way Various technologies are already in use for the recovery of metals from the tailings and for the use of the mineral residues in high and low value products
·In order to further clarify the influence of various factors on the recovery of Au and Ag from the gold tailing by pyrite enhanced chlorination roasting the effect of pyrite addition amount CaCl 2 addition amount of 2 g gold tailing of 20 g roasting time of 60 min air flow rate of 100 mL/min roasting temperature of 850 ℃ and air flow
·Tailing storage facilities TSF also called tailing deposits are the source of most mining related disasters Schoenberger 2016 Approaches to the handling and storage of mine tailings include riverine disposal wetland retention backfilling dry stacking and storage behind damned impoundments Kossoff et al 2014 Mine tailings dam failures can have catastrophic
·The role of lithium in chemical and nuclear industries could hardly be overestimated Babenko et al 2007 World lithium consumption in 2019 was estimated as 58∙10 3 tons with an increase of 18% compared with the previous year National Minerals Information Center 2020 Nevertheless excluding the USA worldwide lithium production in 2019
·This paper presents an overview of the various methodologies used in the recovery of gold from secondary sources Gold recovery is interesting due to its vast industrial applications high market prices and extensively used precious metal the sanctuary value attributed to gold during international political and economical crises and the limited resource
·Research and interventions around artisanal and small scale gold mining ASGM largely focus on mercury Hg use reflecting the sector s status as the largest global source of anthropogenic mercury release to the environment UNEP 2019 and the influence of the Minamata Convention which seeks to curb global mercury artisanal
·For example mine tailings production in Chile is million tons per day and it is estimated that million tons of mine tailings are being generated from South African gold mines [2] [3] Mining activities in China affect 33 000
·Grade recovery curves are the standard way in which flotation bank and plant performance are represented as it is a clear way of showing the trade off between the two main objectives of flotation namely achieving a high grade concentrate while sacrificing as little recovery as possible
·Artisanal and small scale gold mining ASGM is present in over 80 countries employing about 15 million miners and serving as source of livelihood for millions more The sector is estimated to be the largest emitter of mercury globally The Minamata Convention on Mercury seeks to reduce and where feasible eliminate mercury use in the ASGM However
·In most modern large scale gold mining operations over 99% of the originally mined ore eventually becomes tailings Lottermoser 2010 Artisanal and small scale gold mining As of 2009 an estimated 70 countries across the globe had a documented presence of ASGM 65 of which were nations in the tropics and subtropics Telmer & Veiga 2009
·When Tailing thickening was searched using Scopus database 51 documents were found with only 2 review articles since 1978 the first review focused on paste technology in China Yin et al 2020 while the second one was specifically for thickened tailings in Chile and Peru Cacciuttolo Vargas and Marinovic Pulido 2022 suggesting
·In this study A novel method for gold recovery from refractory gold ore was proposed with the purpose of improving recovery efficiency of gold and reducing environmental pollution The method consisted of two stages roasting for arsenic and sulfur removal gold recovery by thiourea leaching followed by an enhanced chlorination roasting for
·Approximately % of the total gold found in the Mazowe float concentrate sample was amenable to gold recovery through direct cyanidation intensive in which the recovered was g/t the results also indicated that there was minimum preg robbing of gold in the concentrate during leaching with approximately % of the total gold at a
·It is known that the tailings of gold mines have brought serious heavy metal pollution; however the heavy metal pollution caused by gold tailings in specific geological environments and extraction processes still must be studied This study investigated the distribution speciation bioaccumulation and pollution of heavy metals in soils from the
·The ratio of tailings to concentrate is commonly very high generally around 200 1 Lottermoser 2007 Moreover as the point of peak metal production is surpassed the extraction of lower grade ore is an established long term trend Mason et al 2010 For example in Australia the average Cu grade was c 10% in 1885 but it fell to 1% by 2005 whereas in
·China s economy ranked second in the world in 2021 accounting for more than 18% of the global economy with a GDP growth of % over the previous year the highest in the world s major economies The State Council of The People s Republic of China 2022 The economic expansion has led to a more urgent demand for mineral resources and a
·1 Introduction High grade gold ores that are highly amenable to conventional cyanide leaching have been largely depleted over time This has a significant effect on the environmental footprint of gold production as refractory ores cannot be easily treated by simple cyanidation treatment
Upgrading Low Grade Graphite Tailing into High Grade Graphite Using Agglomeration The beneficiation study was able to obtain a concentrate with 88% fixed carbon at % recovery for 25 kg sample with no major surface structural changes compared with Natural Vein Graphite indicating that it could be applied on commercial scale with
·Mining generates 13 billion tonnes per year of potentially toxic wet slurry waste called tailings commonly deposited in tailings storage facilities TSF Since 1915 257 TSF failures have
