Cobalt and Tungsten Extraction from Diamond Core Drilling Crowns by Aqua Regia Leaching

In this work, a hydrometallurgical process for the recycling of diamond core drilling crowns by means of aqua regia leaching and subsequent alkali leaching was investigated. This investigation continues a previous study in which nitric acid was used for the acid leaching phase. In the current study,...

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Bibliographic Details
Published in:Materials 2024-10, Vol.17 (21), p.5179
Main Authors: Dimitrijević, Stevan P, Dimitrijević, Silvana B, Veljković, Filip, Ivanović, Aleksandra, Petrović, Sanja J, Maletaškić, Jelena, Veličković, Suzana
Format: Article
Language:English
Subjects:
Acid leaching
Adsorption
Circular economy
Cobalt
Composite materials
Coring
Diamond drills
Drilling and boring
Efficiency
Energy consumption
Environmental conditions
Environmental impact
Field tests
Hydrometallurgy
Infrared imaging
Leaching
Mass spectrometry
Nanomaterials
Nitric acid
Nondestructive testing
Oxidation
Precious metals
Raw materials
Recovery
Robotics
Solvent extraction processes
Steel production
Structural integrity
Sustainable development
Thermography
Tungsten
Tungsten compounds
Waste materials
Zinc
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Summary:In this work, a hydrometallurgical process for the recycling of diamond core drilling crowns by means of aqua regia leaching and subsequent alkali leaching was investigated. This investigation continues a previous study in which nitric acid was used for the acid leaching phase. In the current study, higher tungsten recovery was achieved, reaching 98.2%, which is an improvement of about 1.5%. Another advancement of this study was the high Co recovery (97.21%) and the high purity of the tungsten trioxide obtained, comparable to the previously proposed technological process. Furthermore, a novel laboratory method for testing recycled diamond drilling crowns based on infrared thermography was introduced. Although this innovative approach is not the most accurate, it is fast and cost-effective and provides valuable results before the actual field test is conducted as a final evaluation. In addition, the infrared thermography method offers the advantage of non-destructive testing, ensuring that the diamond drilling crowns can be assessed without compromising their structural integrity. Other instrumental methods used to characterize the products and intermediates were X-ray diffraction (XRD), scanning electron microscope with energy dispersive X-ray spectroscopy (SEM-EDS), and laser desorption ionization mass spectrometry (LDI-MS). The analytical method for the concentrations in all working solutions was ICP-AES.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma17215179