Acidic leaching of steam gasified, pyrolyzed and incinerated PCB waste from LCD screen

• Autorzy: Szczepaniak Włodzimierz , Zabłocka-Malicka Monika , Gurgul Agnieszka , Ochromowicz Katarzyna

Identyfikatory

DOI

10.37190/ppmp/130068

• Języki publikacji: EN

Abstrakty

EN

In the recycling of WEEE, two approaches are common: a pyrometallurgical or hydrometallurgical treatment, preceded by a mechanical and/or physical separation. In this study, twostep processing of unmodified waste samples of LCD screen inverters was investigated: hightemperature processing followed by acidic leaching under fixed conditions (1M H₂SO₄, 90 ℃, 1 bar). The analysis carried out concerned a correlation between the type of HT treatment (pyrolysis, incineration, or gasification) and the dynamics of metals’ leaching from samples pretreated this way. It was found that HT method can act as “thermal disintegration”, since it affects, to a varying degree, the structure of the samples and cause elimination of organics and carbonaceous residue (incineration/gasification). The greatest mass loss (~18%) and the most loosened structure was observed for the gasified sample. Varying oxygen potential in HT-processes correlates well with the leachability of thermally treated inverters. The incineration was found to be the most favorable for copper extraction (>95%) by acidic leaching due to oxidized form of Cu, whereas Cu leaching from pyrolyzed and gasified samples needed oxygen and was controlled by the oxygen supply achieving only 36/43% after 6 h. The course of Pd leaching was similar to copper, although with lower efficiencies; 47% of palladium was extracted from the incinerated sample, and only 4 or 7% from gasified and pyrolyzed samples, respectively. Au was leached immediately but only to a slight extent. Contrary to Pb, leaching of Zn, Sn, Sb, and Ni was gradual, probably due to the formation of alloys with copper.

Słowa kluczowe

EN

electronic waste; recycling; metals; thermal treatment; acidic leaching

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2020
• Tom: Vol. 56, iss. 6
• Strony: 257--268
• Opis fizyczny: Bibliogr. 28 poz., rys., tab., wykr., wz.

Twórcy

autor

Szczepaniak Włodzimierz

• Wrocław University of Science and Technology, Faculty of Environmental Engineering, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

autor

Zabłocka-Malicka Monika

• Wrocław University of Science and Technology, Faculty of Chemistry, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

autor

Gurgul Agnieszka

• Wrocław University of Science and Technology, Faculty of Environmental Engineering, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

autor

Ochromowicz Katarzyna

• Wrocław University of Science and Technology, Faculty of Chemistry, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

Bibliografia

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Uwagi

The work was financed by statutory activity subsidies from the Polish Ministry of Science and Higher Education for the Faculty of Environmental Engineering and Faculty of Chemistry of Wroclaw University of Science and technology.