Wyniki wyszukiwania - BazTech

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LCD panels bioleaching with pure and mixed culture of Acidithiobacillus

Willner Joanna, Fornalczyk Agnieszka, Saternus Mariola, Sedlakova-Kadukova Jana, Gajda Bernadeta

Physicochemical Problems of Mineral Processing

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2022

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Vol. 58, iss. 1

15--23

EN

The influence of pure and mixed culture of A. ferrooxidans and A. tiooxidans as well as different pulp density (1 and 2%) of LCD panels on the In and Sn bioleaching efficiency was investigated. Pulp density is one of the factors affecting the metals extraction efficiency during biological leaching. It has been shown that lower pulp density results in higher indium and tin dissolution. The A. ferrooxidans bioleaching system showed better metal extraction results than A. thiooxidans, especially for tin, indicating the special role of iron and A. ferrooxidans in tin recovery. The highest leaching rate of both indium (94.7%) and tin (98.2%) was obtained using iron and sulfur medium inoculated with mixed bacteria and a pulp density of 1% w/v.

2

Bioleaching of indium and tin from used LCD panels

Willner J., Fornalczyk A., Gajda B., Saternus M.

Physicochemical Problems of Mineral Processing

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2018

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Vol. 54, iss. 3

639--645

EN

The demand for indium is increasing every year. This metal is mainly used as indium tin oxide (ITO) in the production of transparent conductive coatings for liquid crystal displays (LCD). This paper focuses on biohydrometallurgical methods used for the recovery of indium and tin from LCD sourced from spent mobile phones. Bioleaching experiments were carried out in two different leaching media: 9K medium and H2SO4 solution, using mixed, adapted bacteria Acidothiobacillus ferrooxidans and Acidothiobacillus thiooxidans. The main aim of this study was to evaluate the potential and efficiency of indium and tin extraction in the presence of acidophilic microorganisms. Within 35 days, using 9K medium, 55.6% of indium was bioleached, whereas the chemical leaching resulted in a value of 3.4%. Leaching efficiency of tin was 90.2% on the 14th day of the experiment for the biological system (9K) and 93.4% on 21st day of control leaching.

3

Impact of selected parameters on extraction of indium from LCD screens

Stępień M., Palimąka P., Bukowska A.

Metallurgy and Foundry Engineering

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2017

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Vol. 43, no. 4

305--311

EN

Due to the minute availability of indium and its crucial importance to the world economy, it is necessary to find alternative sources of this metal. As a large proportion of indium production is consumed for the purpose of LCD screen manufacturing, it seems reasonable to investigate their recycling leading to the recovery of this metal. The present work investigates the impact of time, temperature, and the concentration of sulfuric acid on the effectiveness of indium extraction from milled LCD panel glass scrap originating from portable computers manufactured between 2005 and 2012. The conclusion of our research defines the optimal conditions for extraction.

PL

Ze względu na niewielkie zasoby indu i jego kluczowe znaczenie dla gospodarki światowej konieczne jest poszukiwanie alternatywnych zasobów tego metalu. Ponieważ ind wykorzystywany jest głównie w produkcji ekranów w technologii LCD, racjonalny wydaje się ich recykling w kierunku odzysku tego pierwiastka. W niniejszej pracy zbadano wpływ czasu, temperatury oraz stężenia kwasu siarkowego na efektywność ługowania indu ze zmielonej frakcji szklanej paneli LCD pochodzących z komputerów przenośnych z lat 2005–2012. W wyniku badań określono optymalne warunki ługowania.