Abstract
Tungsten is an essential metal for the manufacture of special alloys, which is in constant demand due to the development of the industry. The recovery of scheelite from undeveloped tungsten ore in South Korea was investigated to improve the flotation performance for high grade and recovery of concentrate. To investigate the interaction between the flotation reagents and the minerals, the adsorption experiments of oleic acid as a collector on Ca-bearing minerals, such as scheelite, calcite, and fluorite were carried out. This reaction was confirmed chemical adsorption by analysis of zeta potential and FTIR analysis. The batch test was performed using a raw ore to enhance the grade and recovery of the scheelite concentrate. It was obtained at the optimal conditions for high WO3 grade and recovery of scheelite concentrate by using a simple process. In particular, the sodium carbonate used as a pH modifier was investigated to increase scheelite flotation performance by supporting the selective depression of Ca-bearing gangue minerals. Furthermore, a locked cycle test (LCT) was carried out based on batch test results for the design of a continuous pilot plant.
Highlights
Tungsten has been one of the important metals, which is widely used in various industries such as alloys, electron, chemical engineering, etc. [1,2,3,4,5,6,7]
The results showed that oleic acid did not react to mineral surfaces after reaction and mineral surfaces
The results showed that oleic acid did not react to mineral surfaces after with sodium
Summary
Tungsten has been one of the important metals, which is widely used in various industries such as alloys, electron, chemical engineering, etc. [1,2,3,4,5,6,7]. The Sangdong mine in South Korea was the powerhouse of the economy in the 1940s, contributing more than 50% of the export revenue in Korea [10] This mine deposit acted as one of the largest tungsten resources across the globe. It had been the leading global tungsten producer for more than 40 years before it ceased to produce tungsten in 1992, not because of resource depletion [9]. This indicates the current amount of undeveloped ore is expected to remain large. The interest in the development of tungsten has been gradually increasing and the flotation characteristics of tungsten ore from the Sangdong mine are required for the re-development plan
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