• Title, Summary, Keyword: Ore recovery

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A Study on the Magnetic Separation of low grade Iron ore fof Yangyang Mine (양양산저품위철광석(襄陽産低品位鐵鑛石)의 자선(磁選)에 관(關)한 연구(硏究))

  • Park, Yoon Woo
    • Economic and Environmental Geology
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    • v.8 no.3
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    • pp.165-168
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    • 1975
  • The grade and recovery rate and its sulphur content of iron concentrate compared respectively as varied with redcued size using the Crocket Magnetic Separator and the Wet-Drum-Magnetic Separator in the magnetic separation test of iron ore from Yangyang mine. The content of sulphur was decreased distinctly as the size was finer. In case of the sample of -100 mesh, using the Crocket Magnetic Separator, the sulphur content of iron ore was decreased to 0.10% and its grade increased to 67.0%, but the recovery rate was no more than 85.1%. In the Wet-Drum type, the grade and the recovery rate of concentrate was better than those in the Crocket Magnetic Separation, but the content of sulphur was more than that in the Crocket Magnetic Separation. The Crocket type is suitable for less sulphur content while the Wet-Drum Magnetic Separator is suitable for better the grade recovery rate of the magnetic concentrate.

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Research and Development for the Recovery of Uranium and Vanadium from Korean Black Shale Ore (국내(國內) 흑색(黑色) 점판암으로부터 우라늄 및 바나듐 회수(回收)의 연구개발(硏究開發))

  • Kim, Joon Soo
    • Journal of the Korean Institute of Resources Recycling
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    • v.22 no.1
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    • pp.3-10
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    • 2013
  • This general paper covers three parts of the uranium research and development. Part one covers scope of research and development of uranium ore and future prospect, supply and demand of uranium in the world market, deposit, grade and properties of Korean uranium ore and the second part covers status of previous study and supply target for yellow cake, technology of leaching, separation and preparation, procedure of the recovery of U / V from Korean black shale ore. Final part concludes the summary of the present discussion.

Analysis on the Ore Recovery from Operating the Room & Pillar Hybrid Mining Method in the Korean Limestone Mine (국내 석회석 광산에서 주방식하이브리드 채광법의 채수율 분석)

  • Kwon, Dukjoon;Kim, Jaedong
    • Tunnel and Underground Space
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    • v.27 no.3
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    • pp.161-171
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    • 2017
  • Demand for high-grade limestone is increasing, but the production in the domestic mines has been limited due to the lack of systematic development plans and efforts to develop mining technology to improve the recovery ratio, transition to high-cost underground mining due to increasing social awareness of environmental protection, and the smallness of the domestic mining industry, etc. In this study in connection with this issue, an analysis on the recovery change by improvement of mining method was executed. 3D modeling technique was used to construct a 3D model. 3D model includes the geological structure, the limestone ore body and the underground pits and tunnels excavated at the Daepyeong District of Daesung MDI Donghae District. By using the 3D model, measured resources, reserves and ore recovery were evaluated from the results of pilot operation of the room and pillar hybrid mining method, which is a variant of room and pillar mining method. These results were compared with those obtained from the conventional mining method. The ore recovery obtained by hybrid mining method was found to be up to 71.6%, showing about 26%p. increase compared with the case of conventional mining method.

Recovery of Nickel and Cobalt by a Hydrometallurgical Process from Nickel Laterite Ore with High Magnesium Content (마그네슘함량이 높은 니켈 laterite광으로부터 습식공정에 의한 니켈과 코발트 회수)

  • Lee, Manseung;Kim, Sangbae;Choi, Youngyun;Chae, Jonggwee
    • Korean Journal of Metals and Materials
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    • v.48 no.1
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    • pp.62-70
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    • 2010
  • Leaching and solvent extraction experiments have been performed to develop a hydrometallurgical process for the recovery of nickel and cobalt from nickel laterite ore with high magnesium content. Most of the nickel and magnesium in the laterite ore dissolved at leaching conditions of $80^{\circ}C$ and 100 g/L sulfuric acid concentration. while half of the cobalt and iron were leached at the same conditions. Solvent extraction experiments were carried out with D2EHPA and saponifed D2EHPA from a synthetic solution containing Ni, Co, and Mg. The extraction percentage of Co, Mg. and Ni by D2EHPA was very low in a pH range of 4.4 to 7.3. while the extraction percentage sharply increased by using saponified D2EHPA. The stripping percentage of the metals from the saponified D2EHPA increased with sulfuric acid concentration and reached 99.9% at 1 M $H_2SO_4$ solution.

Gravity Separation Characteristic for the Gold.Silver Ores on the Philippine Mankayan District (필리핀 만카얀 지역 금.은 광석의 비중선별 특성)

  • Kim, Hyung-Seok;Chae, Soo-Chun;Kim, Jeong-Yun;Sohn, Jeong-Soo;Kim, Sang-Bae
    • Journal of the Mineralogical Society of Korea
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    • v.21 no.4
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    • pp.383-395
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    • 2008
  • To enhance the grade and recovery rate of the gold/silver ores which yield at Philippine Mankayan mine, we studied the characteristics which are the geologic and mineralogical features of gold and silver ore, the liberation by crushing and grinding, the separation by sieving and shaking table. Gold/silver ore is composed of the sulfide minerals like pyrite, sphalerite, galena; and the gangue minerals which is quartz, clay. Gold/silver element are mainly contained in a sulfide minerals like pyrite, sphalerite and galena. To increase the liberation rate of sulfide minerals containing gold/silver element, the gold/silver ore has to be grounded under $100{\mu}m$ very finely because the crystal size of sulfide minerals is distributed from $1{\mu}m$ to $100{\mu}m$. The liberation rate of gold/silver ore increases to 92% when the particle size ($d_{90}$) of ore is grounded below $100{\mu}m$ by jaw crusher $\to$ cone crusher $\to$ rod mill by steps. The grade and recovery of sulfide minerals could not be enhanced by sieving separation because those crystal size is distributed homogeneously below $100{\mu}m$. But, when we separated the sieved ore using shaking table, the gold and silver grade increased to 40 ppm and 140 ppm, respectively. Then the recovery rate of gold reach almost 100% but that of silver is no more that 50%.

Grain Size and Texture of Silver Minerals from Duk-Eum Ore Deposits (덕음광산(德音鑛山) 은광물(銀鑛物)의 입도(粒度)와 조직(組織))

  • Yang, Dong Yun;Chi, Jeong Mahn
    • Economic and Environmental Geology
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    • v.19 no.spc
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    • pp.227-237
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    • 1986
  • The Duk-Eum mine located in Kongsan-myeon, Naju-gun, Cheolanamdo is producing silver ore mainly, with rare gold association. The grade-up and recovery of the concentrates have been concerned to the main problem. And then, this study aimed at applying the basic data for ore processing. In the first half of the study, the attempts were made to identify the ore minerals, this followed by determination of the mineral texture, paragenesis, grain size, and size distribution by employing the microscopical method and the etching test. The results of the study are as follows: 1. The ore deposit is composed of the hydrothermal fissure linked veins, and filling cavities are mostly tensile fractures or joints, in rhyolitic rocks as a wall rock. 2. The principle ore minerals are native silver, acanthite, canfieldite, pyrargyrite, galena, tetrahedrite, sphalerite, pyrrhotite, chalcopyrite, chalcocite, covellite, zincite, and the gangue minerals are quartz and calcite. 3. The grain size of each ore minerals before grinding are; max. $2\frac{1}{2}$ mesh, medium 48-100 mesh(main size, contained over 80%), min. 3200mesh. And the grain size of each ore minerals after grinding is; max. 42mesh, medium 65-250mesh(main size, contained over 80%), min. 3200mesh. 4. The properties of the mineral texture effected on the ore dressing are follows; a) Inclusion texture; the fine grains of chalcopyrite is included in most acanthite, and rarely, that of galena included in acanthite. b) Exsolution texture; pyrargyrite is exsolved in acanthite. c) Replacement texture; native silver replaced pyrargyrite, and acanthite replaced galena. d) Interlocking paragenetic texture; the interlocking paragenetic minerals are pyrite, chalcopyrite, chalcocite, canfieldite. e) Fissure filling texture; chalcopyrite was filled along the cracks in acanthite. Among of the above texture, it is impossible to liberate the grains of a), and more difficult to liberate those of b) and c), while easy to liberate those of d) and e).

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Leaching kinetics of a Nigerian complex covellite ore by the ammonia-ammonium sulfate solution

  • Baba, Alafara Abdullahi;Balogun, Ayo Felix;Olaoluwa, Daud Temitope;Bale, Rafiu Babatunde;Adekola, Folahan Amoo;Alabi, Abdul Ganiyu Funsho
    • The Korean Journal of Chemical Engineering
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    • v.34 no.4
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    • pp.1133-1140
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    • 2017
  • Hydrometallurgical treatment of copper sulfide ore is increasingly establishing itself as a feasible route for the extraction of copper and recovery of associated precious metals value. This is attributed to the merits of this route, which include suitability for low-grade and complex ores, high recoveries, competitive economics, and other operational features. The leaching kinetics of Nigerian complex covellite ore was investigated in ammonia-ammonium sulfate solution. The concentration of ammonia and ammonium sulfate, the ore particle size, and the temperature were chosen as parameters in the experiments. The results show that temperature, concentration of ammonia-ammonium sulfate has favorable influence on the leaching rate of covellite ores; however, leaching rate decreases with increasing particle size. At optimal conditions ($1.75mol/L\;NH_4OH+0.5mol/L(NH_4)_2SO_4$, $-90+75{\mu}m$, $75^{\circ}C$, with moderate stirring) about 86.2% of copper ore reacted within 120 minutes. The mechanism of the leaching was further established by characterizing the raw ore and the leached residue by EDXRF - chemical composition, SEM - structural morphology and XRD - phase identification studies. From the X-ray diffraction analysis, the partially unreacted Cu and S phases were presumed to be CuO, and the iron present in the CuS phase was mainly converted to hematite ($Fe_2O_3{\cdot}H_2O$), as the CuS phase disintegrated and remained in the residue afterward.

STUDY ON GY NEW MINERAL PROCESSING TECHNOLOGY FOR SHIZHUYUAN POLYMETALLIC ORE

  • Zhang, Zhonghan;Li, Xiaodong;Ye, Zhiping;Guo, Jianguan
    • Proceedings of the IEEK Conference
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    • pp.325-330
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    • 2001
  • Shizhuyuan W-Mo-Bi-Ca $F_2$polymetallic ore is classified to the refractory one due to its complex property, fine dissemination and close association of minerals. Through several years of researches, in line with GY new mineral processing technology developed by Guangzhou Research Institute of Nonferrous Metals, in sulfide flotation circuit, an iso-flotability flowsheet is used to replace original overall bulk flotation flowsheet, and in tungsten flotation circuit, a new chelating type-GY reagent and a special pulp-conditioning system and a new technology of wolframite slime flotation are used to replace the traditional "Caustic Soda Method"$_{[1]}$, the metallurgical performance is greatly improved. Besides, GY New Method has created a favorable condition for comprehensive recovery of fluoride from tungsten flotation tailings. Notable economic benefit has been achieved.d.

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Determination of gold concentration in ore by ICP-AES with MIBK (ICP-AES와 MIBK 용매를 이용한 광물중의 금 분석)

  • Lim, Heon-Sung;Lee, Sueg-Geun
    • Analytical Science and Technology
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    • v.20 no.6
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    • pp.496-501
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    • 2007
  • The 242.795 nm on ICP-AES for the gold analysis was the most sensitive wavelength which was also interfered severely by the spectra of other metal ions such as manganese, chromium, cobalt, and iron. In order to analyze the gold in ore, the gold must be separated from the interfering ions. The best solvent for separation of gold in ore solution was 10 % n-hexane contained MIBK mixed solvent. The gold recovery was 97.5 % from mixed metal solution contained about 2 M $HNO_3$ and 0.5 M HCl.

Quantitative Analysis of Skarn Ore Using 3D Images of X-ray Computed Tomography (3차원 X-ray 단층 화상을 이용한 스카른 광석의 정량분석 연구)

  • Jeong, Mi-Hee;Cho, Sang-Ho;Jeong, Soo-Bok;Kim, Young-Hun;Park, Jai-Koo;Kaneko, Katsuhiko
    • Journal of the Mineralogical Society of Korea
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    • v.23 no.3
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    • pp.211-217
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    • 2010
  • A micro-focus X-ray computed tomography (CT) was employed to determine quantitative phase analysis of skarn Zn-Pb-Cu ore by nondestructive visualization of the internal mineral distribution of a skarn ore. The micro CT images of the ore were calibrated to remove beam hardening artifacts, and compared with its scanning electron microscope (SEM) images to set the threshold of CT number range covering sulfide ore minerals. The volume ratio of sulfide and gangue minerals was calculated 20.5% and 79.5%, respectively. The quantitative 3D X-ray CT could be applied to analyse the distribution of economic minerals and their recovery.