Efficient Recycling of WC-Co Hardmetal Sludge by Oxidation Followed by Alkali and Sulfuric Acid Treatments

Dong-hyo Yang; Rajiv Ranjan Srivastava; Min-seuk Kim; Dao Duy Nam; Jae-chun Lee; Hai Trung Huynh

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자료유형: 학술저널

저자정보: Dong-hyo Yang (Korea Institute of Geoscience and Mineral Resources (KIGAM)) Rajiv Ranjan Srivastava (Korea Institute of Geoscience and Mineral Resources (KIGAM)) Min-seuk Kim (Korea Institute of Geoscience and Mineral Resources (KIGAM)) Dao Duy Nam (Hanoi University of Science and Technology (HUST)) Jae-chun Lee (Korea Institute of Geoscience and Mineral Resources (KIGAM)) Hai Trung Huynh (Hanoi University of Science and Technology (HUST))

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.22 No.5

발행연도: 2016.1

수록면: 897 - 906 (10page)

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We present a process to recycle strategic metals, viz. tungsten and cobalt, from a WC-Co hardmetal sludge (WCHS) via oxidation followed by a two-step hydrometallurgical treatment with alkali and acid solutions. The oxidation of WCHS was investigated in the temperature range of 500 to 1000 °C and optimized at 600 °C to transform the maximum WC into an alkali-soluble WO3. The conditions for the selective dissolution of WO3 in stage-I were optimized as follows: 4.0 M NaOH, pulp density of 175 g/L, and temperature of 100 °C for 1 h, yielding maximum efficacy. Subsequently, in the second step, the optimal conditions for cobalt leaching from the alkali-treated residue were established as follows: 2.0 M H2SO4, 25 g/L pulp density, and 75 °C temperature for 30 min. Downstream processing of the obtained metal ions in solutions was also easier, as the only impurity of dicobaltite ions with the Na2WO4 solution was precipitated as Co(OH)3 under atmospheric O2; meanwhile, the CoSO4 solution obtained through the second step of processing can be treated via electrolysis to recover the metallic cobalt. The present process is simpler in operation, and the efficient use of eco-friendly lixiviants eliminates the previously reported disadvantage.

참고문헌 (39)

참고문헌 신청

R. R. Srivastava / 2014 / J. Mater. Sci 49:4671

Premchand / 1996 / Bull Mater Sci 19:295

R. R. Srivastava / 2013 / Ind. Eng. Chem. Res 52:17591

곽봉원 / 2016 / 고주파유도 가열에 의한 나노구조 WC와 WC-TiAl 급속소결 및 기계적 성질 / 대한금속·재료학회지 54(3):180~186

Yezhe Lyu / 2016 / Non-Vacuum Sintering Process of WC/W2C Reinforced Ni-Based Coating on Steel / Metals and Materials International 22(2):311~318

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