Wyniki wyszukiwania - Biblioteka Nauki

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Critical Incident Technique as an Instrument for Assessing the Service Quality in a Chosen E-Shop

100%

Ingaldi M. , Brožová S.

Multidisciplinary Aspects of Production Engineering

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2020

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tom Vol. 3, Iss. 1

374--383

EN

The development of e-commerce and communication technologies has allowed changes in the traditional trading system, currently customers can use both stationery shops and e-shops. People no longer need to leave their homes to go shopping, even everyday groceries. They can use the e-shop at any time of day or night, at home or at work. There are no queues, they can get to know other people’s opinions, compare products and services with each other. They can shop while sitting on the sofa in front of the TV and sipping tea. Shopping can be done in the e-shop up to thousands of kilometers away. Especially in the current Covid-19 pandemic, online shopping has become very popular. The aim of the paper was to assess the quality of services offered by the research e-shop. During the research the Critical Incident Technique (CIT) was used. A direct interview was conducted with the customers of the research e-shop who, after using its services, agreed to share their impressions and opinions. They were supposed to describe incidents or situations related to the research e-shop, which they have in their memory, and which caused special satisfaction or dissatisfaction. The analysis allowed to indicate that less than 50% of the incidents described by the customers were positive incidents that cause customers’ high satisfaction, which is not a good situation for the research e-shop. Improvement actions are needed.

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Hydrome-metallurgical waste management: Turning metal-enriched waste into valuable resources

80%

Brožová S. , Brož J. , Ingaldi M.

Zeszyty Naukowe Akademii Morskiej w Szczecinie

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2023

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tom nr 75 (147)

107-113

EN

The convergence of hydrometallurgical waste management and the principles of the circular economy holds immense potential for addressing the challenges posed by metal-enriched waste. By turning waste into valuable resources through efficient metal extraction, this approach not only aligns with sustainable development goals but also contributes to the conservation of resources, reduction of waste, and the promotion of economic and environmental well-being. This article deals with the further possibilities of processing metal-bearing wastes in the form of steel drifts via hydrometallurgy. The main part of this research focuses on the development of suitable technology for the leaching of steel flakes to obtain selected non-ferrous metals, mainly zinc and lead, for economic and environmental reasons. Laboratory experiments are carried out to verify a suitable leaching agent in the form of high-temperature acid leaching, neutralizing leaching, and magnetic separation verified in lead seals. From the results of the experiments, a suitable technology for processing steel fumes is proposed.

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Innovative hydrometallurgy for galvanic sludge sustainable recovery

80%

Brožová S. , Drápala J. , Brož J. , Macháčková A.

System Safety : Human - Technical Facility - Environment

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2023

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tom Vol. 5, iss. 1

46--56

EN

The manuscript explores the feasibility of recovering zinc and iron from waste galvanic sludge generated during galvanic plating processes. Galvanic sludge, characterized by elevated concentrations of heavy metals, represents a suitable candidate for hydrometallurgical recycling. The primary objective of the experimental and practical phases was to extract zinc and iron through the leaching of galvanic sludge. Leaching procedures were conducted using sulfuric acid at varying temperatures and time durations, augmented by the introduction of oxidizing agents such as hydrogen peroxide or ozone. Subsequent separation of the leach and filtrate was achieved through filtration. The leachate underwent additional processing involving the precipitation of iron and other metals, employing diverse agents. Following further filtration, electrolysis was employed to attain pure zinc on the cathode, utilizing an electrical voltage of approximately 3 V. Comprehensive chemical analyses were conducted on all intermediate products, including the leachate, leach liquor, filtrate, solid precipitate, and the separated metal on the cathode. The outcomes of these analyses are meticulously presented in tables and graphs.

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Innovated Technologies of Recycling of Metallic Wastes - Modification of Existing Industrial Processes

61%

Brožová S. , Pustějovská P. , Bilík J. , Jursová S. , Zbranková M. , Havránek J.

New Trends in Production Engineering

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2019

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tom Vol. 2, Iss. 2

361-367

EN

This paper describes interesting operational experiments have been performed in the scope of the project where the process of melting deoxidation was used under improvised conditions of cold blast cupola furnace. The goal was to find out metallurgical effects of added self-reducing briquettes prepared from steel sludge into cupola furnace charge and above all to verify the grade of deoxidation of oxides of iron at keeping output quality of cast metal. Present state of research and development of technologies of iron production in the area of commercial exploitation of these technologies is not in such a position that we could realistically assess their efficiency, investment costs and economic impacts. Moreover, an unequivocal requirement on minimization of CO2 emissions, mainly by its recycling, is here more and more promoted.