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Collectorless flotation

Dianzuo Wang, Shuiyu Sun, Yuehua Hu
1992 Resources Processing  
Shuiyu ¥ Hu Yuehua Fig. 1 Plant scale flowsheet for collectorless flotation of copper sulphide ore control of the Eh and pH.  ...  results of plant scale test of collectorless flotation of copper ore ** Department of Mineral Engineering Central South University of Technology Changsha, Hunan, China Wang Dianzuo ¥ Sun  ... 
doi:10.4144/rpsj1986.39.31 fatcat:zarmb7yji5erxnaiakp6pcch6i

Research of Amoxicillin Microcapsules Preparation Playing Micro-Jetting Technology

Huaiyuan Sun, Qingqing Gu, Yuehua Liao, Chenjie Sun
2015 Open Biomedical Engineering Journal  
is funded by Shanghai education committee innovative research Program under Grant 12YZ195.The fabrication work was performed at Shanghai Medical Instrumentation College with the guidance of Professor Sun  ...  Orthogonal experimental design and results. 2 The Open Biomedical Engineering Journal, 2015, Volume 9 Sun et al.  ...  Sun et al. uniformity. The influence of the stirrer speed was the same as the jetting frequency.  ... 
doi:10.2174/1874120701509010115 pmid:25937851 pmcid:PMC4412956 fatcat:lrniikvwn5cgxisl2vil3b4xzq

Precipitation Methods Using Calcium-Containing Ores for Fluoride Removal in Wastewater

Li Wang, Ye Zhang, Ning Sun, Wei Sun, Yuehua Hu, Honghu Tang
2019 Minerals  
F-containing wastewater does great harm to human health and the ecological environment and thus needs to be treated efficiently. In this paper, the new calcium-containing precipitant calcite and aided precipitant fluorite were adopted to purify F-containing wastewater. Relevant reaction conditions, such as reaction time, oscillation rate, dosage of hydrochloric acid, calcite dosage and the assisting sedimentation performance of fluorite, and action mechanism are analyzed. The experiment showed
more » ... hat the removal rate of fluoride in simulated wastewater reached 96.20%, when the reaction time, the dosage of calcite, the dosage of 5% dilute hydrochloric acid, and the oscillation rate was 30 min, 2 g/L, 21.76 g/L, and 160 r/min, respectively. Moreover, the removal rate of fluoride in the actual F-containing smelting wastewater reaches approximately 95% under the optimum condition of calcite dosage of 12 g/L, reaction time of 30 min, and oscillation rate of 160 r/min. The addition of fluorite significantly improves the sedimentation performance of the reactive precipitates. The experimental results showed that calcite and fluorite can effectively reduce the concentration of fluoride ions in F-containing wastewater and solve the problem of slow sedimentation of reactive precipitates.
doi:10.3390/min9090511 fatcat:o3hlrybaxfbf5ekpspambngdy4

Selective Recovery of Mushistonite from Gravity Tailings of Copper–Tin Minerals in Tajikistan

Lei Sun, Yuehua Hu, Wei Sun, Zhiyong Gao, Mengjie Tian
2017 Minerals  
Author Contributions: Yuehua Hu and Wei Sun provided the research ideas and guidance; Lei Sun designed and performed the experiments, and wrote the paper as well; Zhiyong Gao revised the manuscripts; Mengjie  ... 
doi:10.3390/min7120242 fatcat:cyepo5rzojh2zk6f4mjy6hkcma

Magnetic Separation of Impurities from Hydrometallurgy Solutions and Waste Water Using Magnetic Iron Ore Seeding [chapter]

Haisheng Han, Wenjuan Sun, Wei Sun, Yuehua Hu
2020 Iron Ores [Working Title]  
Sun 1,2 and Yuehua Hu 1,2 1 School of Minerals Processing and Bioengineering, Central South University, Changsha, China 2 Iron Ores [1] Wu Y, Tan D, Ding W, Guo S.  ...  DOI: 10.1021/acssuschemeng. 7b03856 [32] Yue T, Sun W, Hu Y, et al.  ... 
doi:10.5772/intechopen.93728 fatcat:5u3t3p4yfrhrjbq4n3feadfnby

Structures of Pb-BHA Complexes Adsorbed on Scheelite Surface

Zhao Wei, Wenjuan Sun, Yuehua Hu, Haisheng Han, Wei Sun, Ruolin Wang, Yangge Zhu, Bicheng Li, Zhenguo Song
2019 Frontiers in Chemistry  
Previous studies have shown that Pb-BHA complexes (lead complexes of benzohydroxamic acid) have better collecting ability and can be used in flotation experiments with BHA acting as a collector and lead ions acting as activators. However, the structures of Pb-BHA complexes adsorbed on a mineral surface remain unclear. In this work, the adsorption behavior of Pb-BHA complexes on the scheelite surface was studied by flotation experiments and adsorption capacity measurements, and the structures of
more » ... the adsorbed Pb-BHA complexes were determined using X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (TOF-SIMS). The adsorption capacity results showed that more BHA was adsorbed on the scheelite surface in Pb-BHA flotation, and the XPS and TOF-SIMS analysis showed that the species of Pb-BHA complexes adsorbed on the scheelite surface were similar in activation flotation and Pb-BHA flotation. Therefore, the different contents of the complexes on the scheelite surface were responsible for the flotation behavior. XPS and TOF-SIMS showed that BHA combined with lead ions to form complexes with different structures, such as five- and four-membered ring structures. Structure fragment inference based on the measurements indicated that lead ions formed monomer complexes with two BHAs, and that lead hydroxide polymers with a certain degree of polymerization bonded with oxygen atoms in the complexes. The Pb-BHA complexes combine with oxygen atoms on the scheelite surface to form an adsorbate, rendering the surface hydrophobic.
doi:10.3389/fchem.2019.00645 pmid:31681725 pmcid:PMC6798039 fatcat:h4jrdllzbzg2pkkvb5x47473gm

Effect of Chain Length Compatibility of Alcohols on Muscovite Flotation by Dodecyl Amine

Li Wang, Ning Sun, Jiapeng Liu, Honghu Tang, Runqing Liu, Haisheng Han, Wei Sun, Yuehua Hu
2018 Minerals  
A portion of dodecyl amine (DDA) in a muscovite flotation system was replaced with alcohols with different carbon-chain lengths. These alcohols included octanol (OCT); decanol (DEC); dodecanol (DOD); and tetradecanol (TER). The muscovite adsorption behavior of the mixed DDA and alcohol systems were investigated through zeta potential; contact angle; and adsorption quantity tests. Single-mineral flotation tests showed that the muscovite-collecting power of the mixed DDA/alcohol (OCT, DEC, or
more » ... system was stronger than that of the pure DDA system. The muscovite-collecting power of the collector systems decreased in the following order: DDA/DEC > DDA/OCT > DDA/DEC > DDA > DDA/TER. Zeta potential and contact angle analysis indicated that when combined with DDA; alcohols physically adsorbed on the surfaces of muscovite. This behavior improved the hydrophobicity of muscovite. Furthermore, adsorption analysis revealed that synergy between DDA and alcohol enhanced the adsorption of alcohol on muscovite. DDA has a dominant role in synergistic adsorption; whereas alcohol has a supporting role. Among all tested alcohols; DDA and DOD exhibit the highest synergetic adsorption effect because of their similar carbon-chain lengths. This similarity promotes the formation of a compact adsorption layer on the muscovite surface.
doi:10.3390/min8040168 fatcat:p4sisuarrngipoyuffx5ujcnay

The Effect of Polystyrene on the Carrier Flotation of Fine Smithsonite

Xiangfeng Zhang, Yuehua Hu, Wei Sun, Longhua Xu
2017 Minerals  
Carrier flotation is a common technique used to improve flotation recovery of ultrafine ores. In this study, we used coarse polystyrene as the carrier material to enhance flotation recovery of fine smithsonite (ZnCO 3 ) particles. Sodium oleate was used as the collector and played a role in the adhesion of fine smithsonite to polystyrene due to its amphipathic properties. The carrier feature of polystyrene was demonstrated using particle size analysis, total organic carbon, and scanning
more » ... microscopy. The fine smithsonite particles coated the polystyrene particles through a reaction between the active zinc sites and the carboxyl head groups of the oleate adsorbed on smithsonite and through a hydrophobic interaction between polystyrene and the hydrocarbon chains of the oleate. Newly enlarged particle aggregates with smithsonite shells enhanced collision and attachment of the hydrophobized aggregates with bubbles, which accelerated smithsonite flotation recovery.
doi:10.3390/min7040052 fatcat:ulr3mfyuzrdfvhyaybydnisqj4

TOX Acts an Oncological Role in Mycosis Fungoides

Xin Yu, Yixin Luo, Jie Liu, Yuehua Liu, Qiuning Sun, Diego Calvisi
2015 PLoS ONE  
Mycosis fungoides (MF) is a low-grade lymphoma characterized by clonal expansion of atypical CD4+ skin-homing T lymphocytes. Herein, we examined the role of thymocytes selection associated HMG-box (TOX), a gene previously found to be unregulated in MF skin biopsies, in MF pathogenesis. TOX encodes a high-mobility group family (HMG) domain DNA binding nuclear protein, which regulates the differentiation of developing T-cells. First, we confirmed that TOX expression levels in MF were increased
more » ... pared with those in benign inflammatory dermatitis (BID) and normal skin. In addition, TOX level increased with the progression MF from patch stage to tumor stage. Overexpression of TOX accelerated the proliferation and migration of MF cell lines in vitro, which were blocked by AKT inhibitors. In conclusion, our study confirmed that TOX was highly expressed in MF lesions and accelerates the proliferation and migration of MF. TOX is a diagnostic marker for MF and may play a pathogenic role in disease progression.
doi:10.1371/journal.pone.0117479 pmid:25811617 pmcid:PMC4374776 fatcat:zgicqj2ihjardjrj6am4gwnk3m

Selective Flotation of Calcite from Fluorite: A Novel Reagent Schedule

Zhiyong Gao, Yuesheng Gao, Yiyang Zhu, Yuehua Hu, Wei Sun
2016 Minerals  
Author Contributions: Zhiyong Gao and Wei Sun conceived and designed the experiments; Yiyang Zhu and Yuesheng Gao performed the experiments; Zhiyong Gao and Yuehua Hu analyzed the data; Zhiyong Gao wrote  ... 
doi:10.3390/min6040114 fatcat:thz52wylw5chbc7trte73auxuy

Risk map of the novel coronavirus (2019-nCoV) in China: proportionate control is needed [article]

Xinhai Li, Xumao Zhao, Yingqiang Lou, Yuehua Sun
2020 medRxiv   pre-print
China is running a national level antivirus campaign against the novel coronavirus (2019-nCoV). Strict control measures are being enforced in either the populated areas and remote regions. While the virus is closed to be under control, tremendous economic loss has been caused. Methods and findings We assessed the pandemic risk of 2019-nCoV for all cities/regions in China using the random forest algorithm, taking into account the effect of five factors: the accumulative and increased numbers of
more » ... onfirmed cases, total population, population density, and GDP. We defined four levels of the risk, corresponding to the four response levels to public health emergencies in China. The classification system has good consistency among cities in China, as the error rate of the confusion matrix is 1.58%. Conclusions The pandemic risk of 2019-nCoV is dramatically different among the 442 cities/regions. We recommend to adopt proportionate control policy according to the risk level to reduce unnecessary economic loss.
doi:10.1101/2020.02.16.20023838 fatcat:l6lijwxgwbbjnd54aztl66p22q

Flotability Improvement of Ilmenite Using Attrition-Scrubbing as a Pretreatment Method

Jihua Zhai, Pan Chen, Hongbin Wang, Yuehua Hu, Wei Sun
2017 Minerals  
Flotation technology of the recovery and utilization of ilmenite from tailings of iron beneficiated in Panzhihua was investigated based on mineralogical study. The results of mineralogical study show that the main occurrence of the valuable mineral are liberated grains of ilmenite. Experimental results of flotation conditions show that attrition-scrubbing raw ores exhibit good flotability with higher recoveries and a slight decrease in grade compared to ores without attrition-scrubbing.
more » ... open-circuit experiments also prove the superiority of attrition-scrubbing raw ores. The results of closed-circuit experiments show that qualified ilmenite concentrate can be obtained and the yield, grade, and recovery are 22.26%, 47.06%, and 60.73%, respectively. Theoretical study and analysis show that there are two contributions to superior flotability for attrition-scrubbing samples. The first is that the attrition-scrubbing samples can uncover more ferrous ions on the newly-produced fresh ilmenite surface, resulting in the increase in active sites. The other is that in the process of attrition-scrubbing, the transformation of ferrous ions to ferric ions can be promoted.
doi:10.3390/min7010013 fatcat:ymmwpimnofhazppymsh7qnbgjy

Selective Separation of Scheelite from Calcite by Self-Assembly of H2SiO3 Polymer Using Al3+ in Pb-BHA Flotation

Zhao Wei, Yuehua Hu, Haisheng Han, Wei Sun, Ruolin Wang, Wenjuan Sun, Jianjun Wang, Zhiyong Gao, Li Wang, Chenyang Zhang, Lei Sun, Ruohua Liu
2019 Minerals  
Author Contributions: Conceptualization, Haisheng Han and Wei Sun; Methodology, Yuehua Hu; Software, Chengyang zhang; Data curation, Ruolin Wang and Wenjuan Sun; Writing -original Figure 14 . 14 Adsorption  ...  (Wei Sun); Methodology, Y.H.; Software, C.Z.; Data curation, R.W. and W.S.  ... 
doi:10.3390/min9010043 fatcat:dmjf6qoxhzbwjjlavaiuad4sq4

Reverse Flotation Separation of Fluorite from Calcite: A Novel Reagent Scheme

Jianjun Wang, Zihan Zhou, Yuesheng Gao, Wei Sun, Yuehua Hu, Zhiyong Gao
2018 Minerals  
Fluorite (CaF2), as an important strategic mineral source, is usually separated from calcite by the common froth flotation method, but this separation is still not selective enough. The development of a selective collector and/or depressant is the key to achieving high selective separation. 1-Hydroxyethylidene-1,1-diphosphonic acid (HEDP or H4L) is widely used as an environmentally friendly water treatment reagent due to its low cost and excellent anti-scaling performance in an aqueous
more » ... In this study, a novel reagent scheme was developed using HEDP as a fluorite depressant and sodium oleate (NaOL) as a calcite collector for the first time. When 3 × 10−5 mol/L of HEDP and 6 × 10−5 mol/L of NaOL were used at pH 6, the optimal selective separation for single minerals and mixed binary minerals was obtained. Zeta potential measurements indicated that HEDP possessed a stronger adsorption on fluorite than calcite, while NaOL did the opposite. This novel reagent scheme is of low cost, uses a small dosage, and is friendly to the environment, which makes it a promising reagent scheme for fluorite flotation in industrial application.
doi:10.3390/min8080313 fatcat:xbylalhnsbgbhoij62u6ugucuq

Significant Improvement in the Scheelite Heating Flotation with Sodium Sulfide

Jianhua Kang, Yuanchao Liu, Sultan Ahmed Khoso, Yuehua Hu, Wei Sun, Runqing Liu
2018 Minerals  
An efficiently optimized reagent regime was investigated to improve scheelite heating flotation. The scheelite grade and recovery in the plant were significantly improved by 5% and 6%, respectively, which remarkably augmented the economic profit by $260,000 per month. The interaction mechanisms of sodium sulfide and sodium oleate with scheelite, calcite and fluorite were evaluated by adsorption amount and Fourier transform infrared (FTIR) analyses. Sodium sulfide exhibited an excellent ability
more » ... o promote the adsorption and desorption of sodium oleate on the scheelite surface and from the calcite and fluorite surfaces, thus facilitating the separation of scheelite from fluorite and calcite.
doi:10.3390/min8120587 fatcat:yl7kskdgurchtch7ws33y5ux4i
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