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WATCH RELATED VIDEO: Студийные мониторы Kali Audio LP-8 (Сравниваем с YAMAHA HS8)

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A novel collector of 1- 2-hydroxyphenyl decenone oxime HPDO was synthesized from 2-hydroxy acetophenone and octanal, and its flotation and adsorption behavior for malachite were studied by flotation tests and x-ray photoelectron spectroscopy XPS analysis.

The flotation results of a single mineral show HPDO is a special collector for malachite. Copper was one of the first metals utilized by humans and had a profound impact on the progress of early human civilization. Copper is still an important material today and is widely used in the electrical and electronic markets, transportation, industrial machinery and equipment, organic chemistry, and medicine Rao et al.

Copper demand is expected to reach The amount of copper in the earth's crust is about 0. More than copper-containing minerals have already been found. However, only 10—15 of these minerals have been successfully developed commercially.

Because the mineral process often brings environmental pollution problems, it is very important to apply copper resources reasonably and efficiently Chan et al. The most common copper sulfide includes chalcopyrite, bornite, and beryllium copper ore. With the further exploitation of known copper sulfide ores, copper oxide ore can serve as a new source of copper to meet the huge market demand Huang et al. Malachite is one of the most common copper oxide ores.

Leaching-SX solvent extraction -EW electrowinning is a commercial method used for processing copper oxide ores Li et al. While this process has shortcomings, such as its lengthy processing steps, high agent consumption, and high extractant cost Liu et al. Recently, two methods of sulfide flotation and direct flotation were used in the flotation of malachite. As for sulfide flotation, traditional copper sulfide flotation collectors do not perform well with hydrophilic malachite, unless it is activated by Na 2 S, NaHS, NH 4 2 S, NH 4 HS, 8-hydroxyquinoline or diethylamine phosphate Shengo et al.

In addition, sulphidisation for copper oxide ore was hard to control because of the complex ore properties Corin et al. As for direct flotation, fatty acids, fatty amines, sulfonates, and phosphonates reveal poor selectivity in separating malachite from calcite Li et al. Hydroxamic acids, such as BA and Octyl hydroxamic acid, show a satisfying flotation performance for malachite Hope et al. However, oxime collectors have not received enough attention over the past two decades. Salicylaldoxime has a strong affinity to Cu II , and is widely studied in copper oxide ore.

Han used a combination collector of salicylaldoxime and xanthate to deal with complex copper oxide ores from the Yulong copper mine in China.

However, the synergy mechanism of salicylaldoxime and xanthate has not yet received the attention of researchers Han et al. Li found that Tert-butyl salicylaldoxime is a powerful collector for malachite Li et al. The other oximes, such as 2-ethylhexenaloxime Xu et al.

However, 1- 2-hydroxyphenyl decenone oxime HPDO for the recovery of copper oxide ore has been hardly studied. The aim of this paper is to provide a reference for the flotation performance adjustment through efficient molecular structure modification. A novel ketoxime collector was synthesized through aldol condensation and ammoximation reaction. The flotation performance of HPDO to malachite was studied by micro and batch flotation tests. The XRD of malachite, quartz, and calcite were shown in Figure 1.

The element analysis of malachite, quartz, and calcite were listed in Table 1. Copper oxide ore from Jiangxi province in China was used in batch flotation. The most abundant copper oxide mineral was malachite 1. The major gangue minerals in the ore were quartz DA was purchased in Aladdin Reagent Company. HPDO was synthesized in our laboratory. Table 1. The compositions of malachite, calcite, and quartz samples analyzed by element analysis.

A micro-flotation experiment was implemented on a flotation machine Jilin Province Prospecting Machinery Factory with an effective cell volume of 40 mL. First, a single mineral was dispersed in water for 2 min. Next, a collector was added for 2 min. Fourthly, the frother was conditioned for 1 min. Finally, the conditioned slurry was floated for 5 min. The flotation results of the single mineral were calculated from the dry weights of the concentrates and tails.

The flowstep of the micro-flotation experiment is shown in Figure 2. A batch-flotation test was conducted by operating a flotation machine Jilin Province Prospecting Machinery Factory with an effective cell volume of mL. After that, the pH of the copper oxide ore for batch flotation was adjusted at around 8. Then, the collector was added for 3 min. The conditioned slurry was floated for 6 min. Finally, the concentrates and tailings were dried and weighed, and the amount of Cu was detected through chemical analyses.

The flowstep of the batch-flotation experiment is shown in Figure 3. All samples were tested under vacuum pressure. In order to reveal the adsorption mechanism, the data of malachite before and after HPDO treatment were carefully collected and treated by using Thermo Scientific Advantage 4. Finally, the brown crude mixture was obtained after removing the solvent.

Product characterization: 1- 2-hydroxyphenyl decenone oxime HPDO , yield of The flotation results of malachite, quartz, and calcite by four collectors are shown in Figure 5. The effect of pH on the flotation recovery of malachite is given in Figure 5A.

The effect of the collector dosage on the flotation recovery of malachite is shown in Figure 5B. As for DA, the recovery increases swiftly at low dosage, and DA can recover The effects of pH values on the flotation recoveries of quartz and calcite are listed in Figures 5C,D. Figure 5. A Flotation recovery of malachite with different collectors.

B The effect of the collector dosage on the flotation recovery of malachite. C The effects of pH values on the flotation recoveries of quartz. D The effects of pH values on the flotation recoveries of calcite. Micro-flotation tests showed that HPDO is a powerful collector for malachite, and achieves a satisfactory selectivity against quartz. This seems to indicate that our method of introducing a long carbon chain into a precursor with chelating ability is effective.

The batch flotation results of malachite with collectors are shown in Table 2. DA shows bad selectivity to Jiangxi copper oxide. It seems that HPDO has the potential to be used in flotation of copper oxide ores. The relative changes in the elements on the malachite surface can prove whether the mineral surface is covered by collectors. It is obvious that the relative intensity of C1s and N1s increase after HPDO adsorption, while the relative intensity of O1s decreases.

It indicates that the malachite surface had been coated by numerous HPDOs with a high concentration of O element. Figure 6. B XPS spectra of Cu 2p. C XPS spectra of N1s. D XPS spectra of O1s. It hinted that copper atoms received electron form electronegative HPDO. As can be seen in Figure 6C , the binding energy of N1s stands around This indicates that HPDO has the potential to deal with low-grade copper ores in minerals engineering.

LL performed the experiments, analyzed all the data, drafted all the figures, and prepared the manuscript. LY performed the experiments. FL revised the manuscript. All authors contributed to the article and approved the submitted version. The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Aslam, M. Effect of separate zinc, copper and graphene oxides nanofillers on electrical properties of pva based composite strips.

Chan, A. Heavy metal removal copper and zinc in secondary effluent from wastewater treatment plants by microalgae. ACS Sustain. Corin, K. The recovery of oxide copper minerals from a complex copper ore by sulphidisation. Cui, C. Investigation on copper flotation from a complex copper ore, Yunnan Province. Elshkaki, A. Copper demand, supply, and associated energy use to Change Hum. Policy Dimens. Feng, Q.


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The effects of bacterial flagella as well as their property on the transport and deposition of bacteria were examined by using four types of Escherichia coli E. Packed column, quartz crystal microbalance with dissipation QCM-D , visible parallel plate flow chamber system, as well as visible flow chamber system packed with porous media system were utilized to investigate the deposition behaviors and the deposition mechanisms of bacteria with different property of flagella. We found that the presence of flagella favored E. Moreover, by changing the porous media porosity and directly observing the deposition process of bacteria in porous media, grain-to-grain contacts were found to be major sites for bacterial deposition. Particularly, flagella could help bacteria swim near and then deposit at grain-to-grain contacts. Elution experiments showed that the portion of bacteria with flagella depositing onto secondary energy minima was relatively lower than bacteria without flagella, indicating that flagella could help bacteria attach onto sand surfaces more irreversibly. Clearly, flagella and their property would have obvious influence on the transport and deposition behaviors of bacteria in porous media.

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hs8 quartz

Root exudates affect the physical properties of the rhizosphere, but how these changes affect its solute transport properties is unknown. In the current study, we tested the effects of two exudates chia mucilage and wheat root exudates on the transport of iodide and potassium in soil. Solute breakthrough experiments, conducted in saturated loamy sand or coarser textured quartz sand, revealed that increasing the exudate concentration in soil results in increasingly non-equilibrium transport of both solutes. This was demonstrated by an initial solute breakthrough at a lower pore volume, followed by the arrival of the peak solute concentration at a higher pore volume. These patterns were more pronounced in soil mixed with mucilage, and in the quartz sand.

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A novel collector of 1- 2-hydroxyphenyl decenone oxime HPDO was synthesized from 2-hydroxy acetophenone and octanal, and its flotation and adsorption behavior for malachite were studied by flotation tests and x-ray photoelectron spectroscopy XPS analysis. The flotation results of a single mineral show HPDO is a special collector for malachite. Copper was one of the first metals utilized by humans and had a profound impact on the progress of early human civilization. Copper is still an important material today and is widely used in the electrical and electronic markets, transportation, industrial machinery and equipment, organic chemistry, and medicine Rao et al. Copper demand is expected to reach

Quartz is a natural mineral mainly composed of silica which is then washed, sieved, dried and bagged. Good quality filter media is essential for monitoring.

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The loess sediments widely distributed in the Central Shandong Mountains are sensitive records of East Asian monsoon changes for situating in a key region connected to the Eurasian Plate and the Pacific Ocean. However, the detailed processes of palaeoclimatic changes are poorly understood for the lack of high-resolution chronology. The loess of the Chinese Loess Plateau CLP potentially provide an important source of information about history of continental aridity, uplift of the Tibetan Plateau, global atmospheric circulation and are closely related to the evolution of the polar ice sheets e. Pye, ; Ding et al. In China, loess sediments not only deposit on the Loess Plateau but also accumulate in other arid, semi-arid and semi-humid areas. In recent years, increasing interest has been focused on the loess outside the CLP in order to derive more local to global palaeoenvironmental information from a wider area e.

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