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10: Transfer Station (TS) Calculates cost, emissions, and energy use associated with Transfer Stations. If you want to reproduce the wholeĪrticle in a third-party commercial publication (excluding your thesis/dissertation for which Calculates emissions, mass flows, and resource use and recovery associated with recycling materials. the average percentage of recycled and recovered materials originating from WEEE. If you are the author of this article, you do not need to request permission to reproduce figuresĪnd diagrams provided correct acknowledgement is given. Policymakers should instead focus on turning the EUs new Recovery and. Provided correct acknowledgement is given. If you are an author contributing to an RSC publication, you do not need to request permission Please go to the Copyright Clearance Center request page. To request permission to reproduce material from this article in a commercial publication, Provided that the correct acknowledgement is given and it is not used for commercial purposes. This article in other publications, without requesting further permission from the RSC, Wang,Ĭreative Commons Attribution-NonCommercial 3.0 Unported Licence. Study of the electrochemical recovery of cobalt from spent cemented carbide The investigation provides favorable electrochemical conditions for the recovery and separation of other valuable metals from spent alloys. Electrodeposition experiments show that cobalt enters the electrolyte in the form of Co( II) and is reduced to elemental cobalt on the stainless steel electrode, and tungsten carbide (WC) is oxidized to tungstic acid (H 2WO 4) under the oxidizing atmosphere of the anode and enriched in the anode area. The average diffusion coefficient of Co( II) is 2.16589 × 10 −7 cm 2 s −1. The electrodeposition is irreversible and controlled by the diffusion step. The nucleation mechanism is close to instantaneous nucleation.
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The transient electrochemical test results show the following: the reduction mechanism of cobalt is Co 2+ (aq) + 2e − → Co (s). X-ray diffraction analysis showed that purified powder is in the 6H-SiC structure and powder consists only of silicon carbide and has no residual silicon. To solve the problem, a low-temperature acid aqueous electrochemical method was used cobalt was recycled on a stainless steel cathode, and at the same time, tungstic acid was enriched at a spent cemented carbide anode, achieving a high efficiency, low energy consumption, and low pollution separation and recovering spent cemented carbide. The recovery system is composed of physical and chemical separation processes to remove silicon particles and magnetic materials which are dispersed in the slurry. The massive accumulation of spent cemented carbide not only produces environmental pollution but also wastes resources such as tungsten and cobalt.