• Title/Summary/Keyword: Molybdenite ($MoS_2$)

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Recovery of Roasting-Molybdenite Concentrate by Froth Flotation (부유선별법에 의한 제련용 몰리브덴 정광의 회수)

  • Park, Chul-Hyun;Jeon, Ho-Seok;Kim, Byoung-Gon;Han, Oh-Hyung
    • Korean Journal of Materials Research
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    • v.19 no.12
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    • pp.661-666
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    • 2009
  • Froth flotation has been carried out in order to produce roasting-molybdenite concentrate from molybdenite ore in the Shin-yeomi mine. In our study, roasting-molybdenite (Mo 0.43%) from Shin-yeomi mine was recovered by varying the conditions of regrinding time, dosage of collector and alkalinity. Liberation and flotation efficiency more were effective at regrinding time of six minutes than at single grinding. Mo recovery curves increased considerably as dosage of kerosene increased, whereas Mo grade curves decreased gradually. The separation efficiency of molybdenite was effective when the dosage of collector (kerosene) was adjusted to 300 g/t. The molybdenite concentrate was agglomerated in the range of pH 5-7 and its separation efficiency increased to pH 9-10. The concentrate of 49.5% Mo grade ($MoS_2$, 82.6%) with 81.5% recovery from Shin-yeomi molybdenite ores was obtained under conditions of 20% pulp concentration, 300 g/t kerosene 325 g/t frother (AF65), 2.5 kg/t depressant ($Na_2SiO_3$), pH 9-10 and four cleaning times. In the future, a trial run that can separate up to 50% Mo grade from Shin-yeomi molybdenite ores will be performed.

Characterization of the Oxidation Roasting of Low Grade Molybdenite Concentrate (저품위(底品位) 휘수연석(煇水鉛石) 정광(精鑛)의 산화배소(酸化焙燒) 특성(特性))

  • Kim, Byung-Su;Lee, Hoo-In;Choi, Young-Yoon;Kim, Sang-Bae
    • Resources Recycling
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    • v.18 no.5
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    • pp.19-25
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    • 2009
  • Molybdenite concentrate ($MoS_2$) is the major mineral for the molybdenum industry, of which the industrial processing is first converted to technical grade molybdenum trioxide ($MoO_3$) by its oxidative roasting and purification, used as a raw material for manufacturing several molybdenum compounds. In the present work, detailed experimental results for the oxidative roasting of low grade Mongolian molybdenite concentrate are presented. The experiments were carried out in the temperature range of 793 to 823 K under an oxygen partial pressure range of 0.08 atm to 0.21 atm by using a thermogravimetric analysis technique. The molybdenite concentrate was an average particle size of $67\;{\mu}m$. In the oxidative roasting of low grade Mongolian molybdenite concentrate, more than 95% of molybdenite was converted to molybdenum trioxide in 60 min. at 828 K. The lander equation was found to be useful in describing the rates of the oxidative roasting and the reaction order with respect to oxygen concentration in a gaseous mixture with nitrogen was 0.11 order.

A study on Microbubble Column flotation for Recovering High Grade Molybdenite (고품립(高品位) 몰리브덴광 선별(選別)을 위한 Microbubble Column 부선 특성 연구)

  • Kang, Hyun-Ho;Shin, Shung-Han;Jeon, Ho-Seok;Han, Oh-Hyung
    • Resources Recycling
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    • v.19 no.2
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    • pp.35-44
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    • 2010
  • As the competition of acquiring foreign resources of advanced countries and developing countries intensifies, South Korea which imports most of the mineral resources, started to re-develop domestic mines for molybdenite ore, in order to secure stable natural resources and decrease foreign currency expense. In this study, as a result of performing XRD and composite analysis on Dongwon NMC's (the sole producer of molybdenite ore in Korea) final concentrate(Mo 50.4%), Quartz, Grossular and Hedenbergite exists as impurities and size analysis showed that in relative coarse particle range of 60~140 mesh was formed with high grade over 57% Mo. Also, a test was performed to confirm the possibilities of increasing the grade and recovery of Dong won NMC's final ore. As a result, Mo 58.6% ($MoS_2$ 97.83%) was obtained with 87.47% recovery at a condition of 15 minutes grinding time, Kerosene as collector 0.1 l/ton, AF as Frother 65 7.2 l/ton, wash water of 630 ml/min and air flow rate of 1,197 ml/min.

Mineralogical Characteristics and Fundamental Study of Flotation for Molybdenum Ore (몰리브덴광의 광물학적 특성 및 부선 기초연구)

  • Oyunbileg Purev;Hyun Soo Kim;Chul-Hyun Park
    • Resources Recycling
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    • v.31 no.6
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    • pp.73-80
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    • 2022
  • This study investigated the mineralogical characteristics and basic flotation properties of domestic molybdenum ores. The source mineral of molybdenum was identified as molybdenite, and the main gangue minerals in the raw ore were silicate minerals. Copper, lead, and zinc were also found in trace amounts. Based on the results of basic flotation properties, molybdenite's zeta potential showed negative charges in all pH ranges. The contact angle of molybdenite increased with pH, reaching a maximum of 74° at pH 9. In optimal conditions, the grade and recovery of the concentrate by unit flotation were MoS2 82.4% and 92.04%, respectively. Further investigation of the impurities in the concentrate revealed a sulfide mineral with surface characteristics similar to molybdenite and silicate minerals combined with molybdenite, which may degrade the quality of the concentrate. To improve the concentrate quality, we intend to control silicate minerals through regrinding and liberation and use column flotation to improve fine particle separation efficiency.

Experimental Design of Column Flotation for Recovery of High Grade Molybdenite (고품위 몰리브덴 회수를 위한 컬럼부선 요인설계)

  • Hyun Soo Kim;Purev Oyunbileg;Chul-Hyun Park
    • Resources Recycling
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    • v.32 no.6
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    • pp.34-44
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    • 2023
  • In this work, column flotation using factorial design was performed for recovering high-grade molybdenite concentrate. First, the flotation concentrate from Samyang Mining Plant was regrinded to a mean size of 165, 116, 46.7, and 38.4 ㎛ for an increase of the liberation degree. Tests were carried out for various variables affecting column flotation, and then the concentrates with molybdenite grade and recovery of 98.3 % and 95.28 % were obtained, respectively. Also, regression was performed using the statistical analysis program (SPSS 25) with the factorial design and experimental data on particle size, flow wash-water velocity and depressant that affect high grade. From the results, a model equation was derived to predict the molybdenite grade (MG) and recovery (MR) with the relationship between column flotation variables. Factors such as depressant concentration + wash-water velocity and particle size + depressant concentration + wash-water velocity were smaller than the significance level (0.05) and had a significant effect on the dependent variable, grade, and in the recovery model, only particle size and wash-water velocity factors affected the dependent variable, recovery.