International Journal of Mineral Processing最新文献

{"title":"Role of prewetting/immersion time in the attachment time between air bubble and Taixi oxidized coal","authors":"Wencheng Xia,&nbsp;Yuling Wang","doi":"10.1016/j.minpro.2017.04.004","DOIUrl":"10.1016/j.minpro.2017.04.004","url":null,"abstract":"<div><p><span>Taixi oxidized coal surface has many hydrophilic functional groups as well as many cracks and holes. The effect of prewetting time on the flotation behavior of Taixi oxidized coal had been observed in our previous studies, and it was surmised that the oxidized coal surface was easier wrapped by water shell because the hydrophilic functional groups could be bonded with water through </span>hydrogen bond and the cracks and holes could also be filled up with water when the coal was prewetted in the flotation cell. However, the mechanism of how the prewetting/immersion process can affect the flotation performance of Taixi oxidized coal is still poorly understood and should be investigated clearly. This paper was to conduct the fundamental studies on the effect of prewetting/immersion time in the attachment time between air bubble and Taixi oxidized coal. It was found that the attachment time increased quickly with the increase of prewetting/immersion time. The micro-bubbles are produced on the oxidized coal surface when the coal particles are immersed in the water. The micro-bubbles may be primarily from the air entrapped in the cracks and holes on the oxidized coal surface. As the prewetting/immersion time increased, the micro-bubbles would dissolve and get away from coal surface, and then the cracks and holes would be fully filled up with the water. Finally, the oxidized coal surface would be wrapped by a thick hydration shell which could prevent the oxidized coal surface from being attached by the bubbles, and hence the bubble-coal attachment time increases with the increase of prewetting/immersion time.</p></div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"163 ","pages":"Pages 9-13"},"PeriodicalIF":0.0,"publicationDate":"2017-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.04.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49637820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Performance comparison of anthracite filter media of different origin in the removal of organic traces from copper electrolyte","authors":"Markku Kuosa ,&nbsp;Bjarne Ekberg ,&nbsp;Leena Tanttu ,&nbsp;Timo Jauhiainen ,&nbsp;Antti Häkkinen","doi":"10.1016/j.minpro.2017.04.006","DOIUrl":"10.1016/j.minpro.2017.04.006","url":null,"abstract":"<div><p>Eight anthracite granule species used as filter media were tested for organic phase separation from copper electrolyte in a filter bed. The effects of filter bed depth and fluid velocity were studied. The macro porosity, density, surface area, bed expansion, pressure loss during backwash, mechanical strength, surface micro porosity<span> and morphology of the anthracite species were analyzed. The organic droplet average diameter and zeta potential<span> of the electrolyte suspension were also measured. In addition, SEM analysis was used to investigate aging and separation performance of filter media. For the different anthracite species, the aging and a similar separation performance were found. However, some variation in performance was detected during backwash experiments. Pilot scale runs with inversed flow indicated that testing of the anthracite species before selection is advantageous.</span></span></p></div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"163 ","pages":"Pages 24-34"},"PeriodicalIF":0.0,"publicationDate":"2017-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.04.006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41858557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The role of mechanical activation on atmospheric leaching of a lateritic nickel ore","authors":"Huseyin Basturkcu ,&nbsp;Neset Acarkan ,&nbsp;Eberhard Gock","doi":"10.1016/j.minpro.2017.04.001","DOIUrl":"10.1016/j.minpro.2017.04.001","url":null,"abstract":"<div><p><span><span>The effect of mechanical activation on the atmospheric pressure leaching of a lateritic nickel ore was investigated to develop a superior alternative. Under the influence of mechanical activation, certain physico-chemical changes were observed. Accelerated leaching kinetics and less </span>sulfuric acid consumption were found as the most beneficial effects of mechanical activation. 80.6% Ni and 84.5% Co in leach were obtained with the mechanically activated sample after 2</span> <!-->h of leaching in 30% H₂SO₄ at 85<!--> <!-->°C and 1/2.5 solid/liquid ratio (w/w). When non-activated sample was leached under the same conditions, similar metal extractions could be obtained after 8<!--> <span>h of leaching. Finally, a process flow sheet<span> was developed including mechanical activation of the laterite, agitation leaching, iron precipitation step, and nickel-cobalt solvent extraction.</span></span></p></div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"163 ","pages":"Pages 1-8"},"PeriodicalIF":0.0,"publicationDate":"2017-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.04.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46066109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Parameters optimization and kinetics of direct atmospheric leaching of Angouran sphalerite","authors":"Saeid Karimi ,&nbsp;Fereshteh Rashchi ,&nbsp;Javad Moghaddam","doi":"10.1016/j.minpro.2017.03.004","DOIUrl":"10.1016/j.minpro.2017.03.004","url":null,"abstract":"<div><p><span><span>In this research, a zinc sulfide<span> (sphalerite) concentrate of Angouran mine was studied by direct atmospheric leaching process. This process is an alternative to the conventional method of roast-leach-electrowinning (RLE) for zinc production by assisting ferric ions as powerful oxidant. The independent </span></span>sphalerite<span> leaching parameters investigated were ferric ions concentration (0.4–1.2</span></span> <!-->M), temperature (40–80<!--> <!-->°C), particle size (21–53<!--> <span>μm), sulfuric acid concentration (0.5–1.5</span> <!-->M) and time (2–6<!--> <span>h). Response surface methodology (RSM) was used to optimize the process parameters. The most influencing parameter was found to be temperature and the less effective was acid concentration. Based on the results, ferric ions illustrate a complex effect on the recovery of zinc; In this regard, interaction of ferric ions with operational parameters was proposed. The optimum recovery for leaching of the zinc sulfide concentrate (e.g., 84.72%) was obtained at ferric ions concentration of 1.2 M, temperature of 80</span> <!-->°C, mean particle size of 21<!--> <!-->μm and leaching time of 6<!--> <!-->h. The predicted percentage recovery of zinc at the optimum condition was found to be 84.96% which was very close to the experimental value of 84.72%. Kinetic investigation was carried out in the optimum condition that obtained by RSM. Kinetic results showed that there were two stages in the sphalerite leaching. At the beginning of the leaching process, kinetics of sphalerite leaching is fast, while after about an hour the overall rate of leaching has decreased. The kinetic of leaching in the first stage is affected by both rate of chemical reaction and rate of diffusion through the sulfur layer. In this stage, the contribution of chemical reaction gradually decreases by increasing the temperature. In the second stage, the leaching rate of sphalerite is controlled only by diffusion through the product layer.</p></div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"162 ","pages":"Pages 58-68"},"PeriodicalIF":0.0,"publicationDate":"2017-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.03.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48352181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of a newly isolated native bacteria, Pseudomonas sp. NP22 on desulfurization of the low-rank lignite","authors":"Tong Liu ,&nbsp;Jin-hui Hou ,&nbsp;Yao-li Peng","doi":"10.1016/j.minpro.2017.02.014","DOIUrl":"10.1016/j.minpro.2017.02.014","url":null,"abstract":"<div><p><span>In this study, low-rank lignite<span> coal sample collected from Jining coalfield of Shandong province in China was subjected to desulphurization by using a new bacteria and </span></span><em>Acidithiobacillus ferrooxidans</em> isolated from the native coal mine site. The molecular identification of the 16S rRNA gene showed that the new native bacteria was <span><em>Pseudomonas</em></span> sp., denoted as NP22, and it is reported for the first time for the capability to remove about 46% of total sulphur from the lignite coal. In the present study, the effects of various parameters such as medium pH, incubation time, pulp density, particle size, incubation temperature on desulphurization from lignite coal with the <em>Pseudomonas</em> sp. NP22 and <em>Acidithiobacillus ferrooxidans</em><span> were investigated. Analytical characterization indicated that total sulphur content of lignite coal was reduced to 2.76% and 3.23% by using two microorganisms. Also, the calorific value of lignite coal was not affected adversely after two microorganisms' desulphurization but rather its calorific value increased from 6219</span> <!-->cal/g to 6406<!--> <!-->cal/g and 6315<!--> <!-->cal/g, however, the ash content of the lignite coal was eliminated.</p></div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"162 ","pages":"Pages 6-11"},"PeriodicalIF":0.0,"publicationDate":"2017-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.02.014","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47477571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Wettability in water/iron ore powder systems: To the universality of the Cassie model","authors":"Rodolfo Marín Rivera,&nbsp;Alexey Koltsov,&nbsp;Branko Araya Lazcano,&nbsp;Jean-François Douce","doi":"10.1016/j.minpro.2017.02.016","DOIUrl":"10.1016/j.minpro.2017.02.016","url":null,"abstract":"<div><p><span>During iron ores<span> granulation process minimization of the volume of water is of vital economic importance due to the associated energy cost of evaporation in the second sintering step. The optimisation of water addition demands understanding of capillarity<span> properties of iron ore mixtures to ensure at the same time good mechanical strength of iron ore granules and just needed minimum of water in the granulation drum. Thus, in the current work wettability and capillarity properties of 7 iron ores, 7 additives and 7 mixtures of those components were studied. It was found that particles with size below 0.1</span></span></span> <span>mm have a big influence on the contact angle and percentage of infiltrated water of mixtures. Particularly, the content of hematite Ore 1 had a significant effect on the contact angle. The use of calcine and dolomite additives affects slightly the magnitude of the water surface tension, but modifies the wettability of iron ores. The adaptation of the Cassie model for mixtures of iron ores of &gt;</span> <!-->2-phases gave an excellent estimation of the contact angle for mixtures with size particles below 0.1<!--> <!-->mm. A good estimation for mixtures with particles larger than 0.1<!--> <!-->mm was also obtained.</p></div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"162 ","pages":"Pages 36-47"},"PeriodicalIF":0.0,"publicationDate":"2017-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.02.016","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45244666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The extraction of platinum and palladium from a synthetic cyanide heap leach solution with strong base anion exchange resins","authors":"E. Schoeman ,&nbsp;S.M. Bradshaw ,&nbsp;G. Akdogan ,&nbsp;C.A. Snyders ,&nbsp;J.J. Eksteen","doi":"10.1016/j.minpro.2017.02.017","DOIUrl":"10.1016/j.minpro.2017.02.017","url":null,"abstract":"<div><p><span>The use of ion exchange resins for the extraction of platinum and palladium from a synthetic cyanide leach solution is described in this paper. An increase in the concentrations of both platinum and palladium cyanide in solution from 0.15 to 0.45</span> <!-->mg/L and from 0.40 to 1.2<!--> <!-->mg/L respectively resulted in higher equilibrium loadings while the first order constants remained constant. The solution pH did not have a significant effect on the equilibrium loading of platinum cyanide and palladium cyanide in the ranges 9 to 11. However, improvements in the loading kinetics of both these complexes were noticed with an increase in solution temperature from 30 to 60<!--> <!-->°C. Changes in zinc cyanide and nickel cyanide concentrations in the range 5 to 20<!--> <!-->mg/L did not have a significant effect on the adsorption of platinum cyanide and palladium cyanide. It was concluded that strong base anion exchange resins could effectively recover platinum and palladium cyanides from dilute synthetic cyanide solutions and that the exchange capacity and functionality of these ion exchange resins might have played an important role in their affinity for different metal anions in solutions.</p></div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"162 ","pages":"Pages 27-35"},"PeriodicalIF":0.0,"publicationDate":"2017-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.02.017","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45295807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Roles of oxidants and reductants in bioleaching system of chalcopyrite at normal atmospheric pressure and 45 °C","authors":"Hongbo Zhao,&nbsp;Jun Wang,&nbsp;Lang Tao,&nbsp;Pan Cao,&nbsp;Congren Yang,&nbsp;Wenqing Qin,&nbsp;Guanzhou Qiu","doi":"10.1016/j.minpro.2017.04.002","DOIUrl":"10.1016/j.minpro.2017.04.002","url":null,"abstract":"<div><p>In this work, the roles of dissolved oxygen (O₂), Fe^{3<!--> <!-->+} and Fe^{2<!--> <!-->+}<span><span> and their interactions during chalcopyrite </span>leaching in basic culture medium at normal atmospheric pressure and 45</span> <span>°C were investigated by leaching experiments, XPS and electrochemistry analysis. Results showed that Fe</span>^{3<!--> <!-->+} remarkably promoted chalcopyrite dissolution at the initial stage of leaching process, while easily caused the final passivation at the later stage. Leaching experiments showed that Fe^{2<!--> <!-->+} cannot promote chalcopyrite dissolution in N₂ atmosphere, while significantly promoted chalcopyrite dissolution in O₂ atmosphere. XPS and electrochemistry further proved that Fe^{2<!--> <!-->+} cannot directly react with chalcopyrite, Fe^{2<!--> <!-->+} was steadily oxidized to Fe^{3<!--> <!-->+} by O₂<span> and caused redox potential at an appropriate range (about 380–480</span> <span>mV vs. Ag/AgCl), thus eliminating passivation species of polysulfide (S</span>_n^{2<!--> <!-->−}<span>) and promoting chalcopyrite dissolution. Dissolved oxygen can directly oxidize chalcopyrite when with no addition of metal ions. In addition, Fe</span>^{3<!--> <!-->+}, rather than O₂ was the main oxidant in leaching system of chalcopyrite at normal atmospheric pressure. Band theory was used to further interpret the roles of oxidants and reductants in bioleaching system of chalcopyrite. This work is potentially useful in interpreting the roles of oxidants and reductants in bioleaching system of chalcopyrite at normal atmospheric pressure and 45<!--> <!-->°C.</p></div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"162 ","pages":"Pages 81-91"},"PeriodicalIF":0.0,"publicationDate":"2017-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.04.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45755973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization of the reactive silica quantification method applied to Paragominas-type gibbsitic bauxites","authors":"S.P.A. Paz ,&nbsp;R.S. Angélica ,&nbsp;H. Kahn","doi":"10.1016/j.minpro.2017.03.003","DOIUrl":"10.1016/j.minpro.2017.03.003","url":null,"abstract":"<div><p>This study presents an optimization of the method used to quantify reactive silica (RxSiO₂<span>) in gibbsitic bauxites, specifically those which contain no (or insignificant) quartz. In this work they are named as Paragominas-type Bauxites. A factorial design of experiments was used. The variables included the temperature, caustic concentration and time for two cases: bauxites with low and high RxSiO</span>₂ contents. Temperature is the most important factor and has a positive influence on RxSiO₂. First-order empirical models were properly obtained to predict the amount of RxSiO₂ as a function of temperature, caustic concentration and time, which responded to the following optimal conditions: (1) without significant amount of quartz – 180<!--> <!-->°C, NaOH 10% w/v and 60<!--> <!-->min for low RxSiO₂ and 25<!--> <!-->min for high RxSiO₂, and (2) with significant amount of quartz – 150<!--> <!-->°C, NaOH 20% w/v and 60<!--> <!-->min for both situations.</p></div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"162 ","pages":"Pages 48-57"},"PeriodicalIF":0.0,"publicationDate":"2017-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.03.003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43015567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Magnetic SN-functionalized diatomite for effective removals of phenols","authors":"Yichang Yu ,&nbsp;Zhangjun Hu ,&nbsp;Yue Wang ,&nbsp;Hongwen Gao","doi":"10.1016/j.minpro.2017.02.001","DOIUrl":"10.1016/j.minpro.2017.02.001","url":null,"abstract":"<div><p><span><span>A magnetic nano-scaled composite was synthesized by self-assembly of cationic surfactant octadecyl dimethyl hydroxyethyl </span>ammonium nitrate<span> (SN) into natural mineral diatomite </span></span><em>via</em><span> a ‘dissolution and reassembly’ method. Fourier transform infrared (FT-IR), elemental analysis, scanning electron microscopy (SEM), transmission electron microscope (TEM), surface area and magnetic analysis were performed to characterize the achieved composites. The results indicated that SN and Fe</span>₃O₄<span> nanopartilces were successfully inserted into the diatomite matrix. Under the same condition, the mixed phenols adsorption experiments showed that the maximum adsorption capacity of phenols by the composite was in order of 2,4,6-trichlorophenol</span> <!-->&gt;<!--> <!-->2,6-dichlorophenol<!--> <!-->&gt;<!--> <!-->2,4-dichlorophenol<!--> <!-->&gt;<!--> <!-->p-nitrophenol<!--> <!-->&gt;<!--> <!-->m-methylphenol<!--> <!-->&gt;<!--> <span>phenol, the same as the competitive adsorption ability. The adsorption process obeyed the Langmuir isothermal model. 2,6-Dichlorophenol was used as a representative contaminant to further investigate the mechanism of adsorption. Electrostatic interaction and hydrophobic stacking effect might play important roles in the adsorption towards organic phenols. Owing to the embedded magnetic Fe</span>₃O₄<span>, the composite was able to be separated easily from liquid media under an external magnetic field. The further calcination of the used composites showed a possibility to deliver new magnetic mesoporous absorbents for further use.</span></p></div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"162 ","pages":"Pages 1-5"},"PeriodicalIF":0.0,"publicationDate":"2017-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.02.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43517808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}