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17 results on '"Gajda, Bernadeta"'

1. Direct Sonochemical Leaching of Li, Co, Ni, and Mn from Mixed Li-Ion Batteries with Organic Acids.

Author

Willner, Joanna, Fornalczyk, Agnieszka, Gajda, Bernadeta, Figlus, Tomasz, Swieboda, Adam, Wegrzyński, Dawid, Mlonka, Aleksander, Perenc, Bartosz, and Kander, Michał

Subjects
ELECTRONIC equipment, SULFURIC acid, ORGANIC acids, HYDROGEN peroxide, LITHIUM-ion batteries, OXALIC acid, CITRIC acid
Abstract

Metals such as nickel, cobalt, lithium, and manganese are widely used in lithium-ion batteries (LIBs) in electronic devices and electric vehicles. It is forecast that there will be a strong increase in the number of electronic devices and electric vehicles in the coming years. (1) Background: In this paper, the application of ultrasound waves on improving Li, Co, Mn, and Ni leaching efficiency from mixed active cathode materials from different types of LIBs is presented. (2) Methods: Environmentally friendly, low-concentrated (0.75 M) organic acids (oxalic acid, citric acid) and, additionally, sulfuric acid, were used in sonochemical and chemical leaching (stirring process) at a temperature of 60 °C. (3) Results: The results showed significantly higher leaching efficiency of metals with ultrasound-assisted treatment, especially when using organic acids. An average of 50% better leaching results were obtained for Li in oxalic acid (99.6%) and for Co (93.1%) in citric acid during sonochemical leaching. (4) Conclusions: Based on the theory of hydrogen peroxide formation during ultrasound wave transition in solutions, the role of H2O2 as one of the most effective reductants used to enhance cobalt, manganese, and nickel leaching from LIBs is indicated. [ABSTRACT FROM AUTHOR]

Published
2024
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9. LCD panels bioleaching with pure and mixed culture of Acidithiobacillus.

Author

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

Subjects
TIN, METALS, LEACHING, SULFUR, INDIUM, BACTERIAL leaching, PAPERMAKING, DENSITY
Abstract

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. [ABSTRACT FROM AUTHOR]

Published
2022
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10. TRENDS IN THE USE OF LEACHING AGENTS FOR THE RECOVERY OF METALS FROM ELECTRONIC WASTE.

Author

Magdalena Lisińska, Mgr inż., Silvie Brožová, Ing., Mariola Saternus, hab. inż., and Gajda, Bernadeta

Subjects
PRECIOUS metals, ELECTRONIC waste, ATOMIC emission spectroscopy, METAL wastes, NONFERROUS metals, PRODUCT life cycle, LEACHING
Abstract

Waste electronic equipment has become one of the fastest growing waste streams in the world. Mobile phones make up a large proportion of this waste. They cause not only ecological threat, but also a serious waste of resources, including copper. That is why new and effective ways of processing this waste and reusing recovered metals are increasingly being sought. Most modern research on the recovery of non-ferrous and precious metals from mobile phones has focused on hydrometallurgical and biometallurgical techniques. This article presents the impact of ozone on the leaching process of selected metals from printed circuit boards of used mobile phones. The trend of changes occurring during the leaching of e-waste in H2SO4 and HCl using O3, monitored for 20 min, is presented. An increase in the concentration of selected metals in the solution indicates a positive effect of the additional oxidizing agent, which is ozone. Additionally, the results of these e-waste leaching in aqua regia are presented. The purpose of leaching was to check the initial metals content in PCB waste and the content of these metals in samples that had previously been subjected to acid leaching experiments at various parameters. The content of metals after leaching in aqua regia was determined using microwave plasma atomic emission spectroscopy (MPAES) (Agilent MP-AES 4200). Currently, electronic waste is a huge problem worldwide. The continuous development of more reliable, advanced technologies has shortened the life cycle of the product, as a result of which consumers buy new electronic devices while rejecting old ones. Old, useless electronic devices are thrown away. These activities have led to an increase in the amount of electronic waste in the world. Electronic waste, including mobile phones, contain many valuable metals, including copper, gold, silver, palladium and others. [ABSTRACT FROM AUTHOR]

Published
2020
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11. Bioleaching of indium and tin from used LCD panels

Author

Willner, Joanna, Fornalczyk, Agnieszka, Gajda, Bernadeta, and Saternus, Mariola

Subjects
0205 materials engineering, indium recovery, 020502 materials, bioleaching, LCD panels, 02 engineering and technology, 010501 environmental sciences, tin recovery, 01 natural sciences, 0105 earth and related environmental sciences, ITO
Abstract

Physicochemical Problems of Mineral Processing; ISSN 2084-4735

Published
2018
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