Type: Specific Objective 1.1.1 "Improve research and innovation capacity and the ability of Latvian research institutions to attract external funding, by investing in human capital and infrastructure".1.1.1.1. measure “Industry-Driven Research”

Agreement No: 1.1.1.1/20/A/139

Duration: 2021. – 2023.

Project Leader: Institute of Solid State Physics, University of Latvia, Dr. Phys. Vladimirs Pankratovs.

Project partners:

  • Rīgas Tehniskā Universitāte, Riga Technical University (RTU)
  • SIA ZTF AERKOM

Total budget: 540 540,00 EUR

ISSP UL budget: 216 216,00 EUR

Project description:

General goal of the project: Development of suitable electrochemical recycling technology of electronic scrap (e-scrap) from printed circuit board (PCB) by alternating current (AC) of industrial frequency for the most complete extraction of all metallic components into solution and evaluation of its profitability.

The tasks of ISSP UL:

The ISSP researchers will be responsible for the implementation of the following tasks: i) Investigations of raw material impact on efficiency of metal extraction process; ii) Investigations of electrolyte impact on efficiency of metal extraction process; iii) Investigations of technical parameters on efficiency of metal extraction process; iv) Study of metal extraction process reproducibility.

 

Project progress

Reporting period: 01.03.2022. - 31.05.2022

01.06.2022

Based on the obtained results, materials for publications and participation in conferences were collected. One publication was submitted to the high-ranking journal Applied Energy. A referee report was received from reviewers indicating the need to revise the publication. A new version of the edition has been prepared and submitted. In addition, the conference abstracts were submitted to the FMNT conference, and these conference abstracts were successfully accepted for participation in the conference as poster presentations. A Latvian patent application has been prepared. The patent application has been approved by the ISSP Innovation Department. The patent application has been sent to the FORAL office for further approval.


Reporting period: 01.12.2021. - 28.10.2022 

01.03.2022

During the period under review, e-scrap was studied, consisting mainly of printed circuit boards from which liquid samples were prepared by model experimental processes for the quantification of metals. X-ray phase (XRD) and X-ray fluorescence (XRF) analysis was continued, and dry residue characterization by XPS was performed. In addition, photoluminescence measurements of non-metallic nanoparticles in both liquids and solids were performed.


Reporting period: 01.09.2021. - 30.11.2021

01.12.2021

An experimental electrochemical cell with two removable graphite electrodes and an electrolyte volume of 350 ml was prepared. The material is selected and containers are made for placing the test sample. Cell testing experiments using crushed copper foil as raw material were performed. A series of model experiments were performed to investigate the effect of the dispersion of the raw material (PCB) and the content of the “non-metallic” (non-conductive) part. Three powdered fractions with particle sizes <0.09 mm, 0.09 - 0.18 mm and 0.18 - 0.35 mm with a content of “non-metallic” fraction from ⁓5% by weight to ⁓50% by weight were used as objects. Liquid samples were prepared by model experimental processes for the quantitative determination of metals in electrolyte solution by inductively coupled plasma optical emission spectrometry (ICP-OES). Solid residue samples were prepared both after opening the raw material samples and after model experimental processes to perform X-ray phase (XRD) and X-ray fluorescence (XRF) analysis, as well as characterization of the dry residue by XPS method.


Reporting period: 01.06.2021. - 31.08.2021

01.09.2021

Review of the scientific literature on XPS, XRD, microscopy and Raman spectroscopy methods for the characterization of drag and rare earth metals and metal oxides. Experimental design and testing of a laboratory electrolytic cell (V = 500 ml) in model experiments. Preparation of samples for XPS, XRD, Raman spectroscopic measurements from raw scrap materials.