Browse > Article
http://dx.doi.org/10.7844/kirr.2017.26.6.91

Tungsten Recovery from Tungsten Carbide by Alkali Melt followed by Water Leaching  

Kim, Byoungjin (Dept. of Energy & Resources Engineering, Kangwon National University)
Kim, Suyun (Dept. of Energy & Resources Engineering, Kangwon National University)
Lee, Jaeryeong (Dept. of Energy & Resources Engineering, Kangwon National University)
Publication Information
Resources Recycling / v.26, no.6, 2017 , pp. 91-96 More about this Journal
Abstract
Tungsten (W) recovery from tungsten carbide (WC) was researched by alkali melt followed by water leaching. The experiments of alkali melt were carried out with the change of the sort of alkali material, heating temperature, and the heating duration. Water leaching of W was performed in the fixed conditions ($25^{\circ}C$, 2 hr., slurry density: 10 g/L). From the mixture of WC and sodium nitrate ($NaNO_3$) in the molar ratio of 1:2, treated at $400^{\circ}C$ for 6 hours, only 63.3% of W might be leached by water leaching. With the increase of sodium hydroxide (NaOH) as a melting additive, the leachability increased. Finally it reached to 97.8 % with the melted mixture of ($WC:NaNO_3:NaOH$) in the ratio of (1:2:2). This imply that NaOH may play a role as a reaction catalyst by lowering Gibb's free energy for alkali melt reaction for WC.
Keywords
Tungsten Carbide (WC); Tungsten (W); Hard metal; Alkali Melt; Water Leaching;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 L. Luo et al., 2004 : Recovery of tungsten and vanadium from tungsten alloy scrap, Hydrometallurgy, 72, pp. 1-8.   DOI
2 J. A. Kim et al., 2011 : Fundamental Study on Recovery of WC from Hardmetal Sludge by Using Mineral Processing, Materials Transactions, 52(7), pp. 1471-1476.   DOI
3 J. H. Kim et al., 2010 : Recovery of Tungsten from WC-Co Hardmetal Sludge by Aqua regia Treatment, J. of Korean Inst. of Resources Recycling, 19(4), pp. 41-50.
4 J. R. Lee et al., 2016 : Leaching Behavior of Al, Co and W from the Al-Alloying Treated WC-Co Tool as a New Recycling Process for WC Hard Scrap, Metals, 6(8), pp. 174-183.   DOI
5 J. K. Jeong et al., 2012 : Trend on the Recycling Technologies for the used Tungsten Carbide (WC) by the Patent and Paper Analysis, J. of Korean Inst. of Resources Recycling, 21(1), pp. 82-92.   DOI
6 Y. Zhang et al., 2010 : Decomposition of chromite ore by oxygen in molten NaOH-$NaNO_3$, Int. J. Miner. Process., 95, pp. 10-17.   DOI
7 D. Wang et al., 2016 : Decomposition Kinetics of Titania Slag in Eutectic NaOH-$NaNO_3$ System, Metall. Mater. Trans. B, 47(1), pp. 666-674.   DOI
8 B. F. Dmitruk et al., 1997 : Thermodynamics of Tungsten Carbide Decomposition by Molten Salts, Inorg. Mater., 33(9), pp. 1072-1075.
9 H. R. Kim et al., 2012 : Leaching of Vanadium and Tungsten from Spent SCR Catalysts for De-$NO_x$ by Soda Roasting and Water Leaching Method, J. of Korean Inst. of Resources Recycling, 21(6), pp. 65-73.   DOI
10 J. R. Lee et al., 2017 : A New Recycling Process for Tungsten Carbide Soft Scrap That Employs a Mechanochemical Reaction with Sodium Hydroxide, Metals, 7(7), pp. 230-238.   DOI
11 J. W. Song et al., 2012 : Industrial Supply Chain Trend of Domestic Tungsten, J. Kor. Powd. Met. Inst., 19(1), pp. 79-86.   DOI