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The Use of Coffee Waste in the Reduction of Metallurgical Slags

Matula Tomasz, Kortyka Łukasz, Myćka Łukasz, Łabaj Jerzy, Wojtal Tomasz

Archives of Foundry Engineering

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2023

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Vol. 23, iss. 1

103--109

EN

Coffee is grown in over 50 countries around the world, and its sale is the largest in the world trade after crude oil. In the case of coffee beans, after consumption remains a solid waste in the form of a waste plant extract. At present, coffee waste is not fully managed, which means that it is often deposited in landfills. Taking into account their availability on the market and the content of significant amounts of carbon in them, it was proposed to use them as a reducing agent in the processing of copper slags. The use of Solid Coffee Grounds (SCG) as an alternative reducing agent for coke and coke breeze can be beneficial in two aspects. The first is the reduction of carbon dioxide emissions in the process, and the second is due to the possible release of hydrocarbons from these wastes at high temperatures, which, apart from participating in the reduction process itself, causes also mixing of the bath in the melting unit, which facilitates the process of copper sedimentation in the slag. The experiments carried out on a laboratory scale showed the possibility of reducing the copper content in the slag after the reduction process from 10.3 to 0.41 % by mass. The obtained values of the relative degree of copper splashing for all experiments ranged from 88.4 to 96.0 %. The presented solution is an innovative approach to the use of SCG in the processing of copper slags.

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Impact of coffee grounds addition on the calorific value of the selected biological materials

Sołowiej P., Neugebauer M.

Agricultural Engineering

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2016

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Vol. 20, No. 1

177--183

EN

The objective of the paper was, inter alia, to determine the impact of coffee grounds on the heat of combustion of their combination with other biological materials. Research on the heat of combustion and calculations of the calorific value were carried out with the use of a KL-12 Mn calorimeter according to the technical specifications and standards PN-81/G–04513 i PN-ISO 1928:2002. Coffee grounds, tea grounds, pine wood and yellow wheat straw were used in the research. The heat of combustion of particular substrates was determined and then their mixtures with coffee grounds in the following proportion were prepared: 75% substrate – 25% coffee grounds, 50% substrate – 50% coffee grounds, 25% substrate – 75% coffee grounds. Calorific value of particular substrates was increasing with the amount of added coffee grounds. Their biggest flow was reported in the mixture of 50%/50% of coffee grounds and wheat straw and the smallest in case of coffee grounds and wood on account of a similar calorific value of both substrates.

PL

Celem badań było m.in. określenie wpływu zawartości fusów kawy na ciepło spalania ich mieszaniny z innymi materiałami biologicznymi. Badania ciepła spalania i obliczenia wartości opałowej przeprowadzono za pomocą kalorymetru KL-12Mn zgodnie ze specyfikacją techniczną i normami PN-81/G–04513 i PN-ISO 1928:2002. Do badań wykorzystano fusy kawy, fusy herbaty, drewno sosnowe oraz słomę pszenną żółtą. Określono ciepło spalania poszczególnych substratów, a następnie przygotowano ich mieszaniny z fusami kawy w stosunku: 75% substratu – 25% fusów kawy, 50% substratu – 50% fusów kawy, 25% substratu – 75% fusów kawy. Wartość opałowa poszczególnych substratów wzrastała wraz z ilością dodawanych fusów kawy. Największy ich wpływ odnotowano w mieszaninie 50%/50% fusów kawy i słomy pszennej, a najmniejszy w przypadku fusów kawy i drewna ze względu na zbliżoną wartość opałową obu substratów.

3

Quality parameters of the solid fuel produced from coffee grounds and tea grounds

Smaga M.

Acta Innovations

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2016

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no. 20

26--30

EN

The article describes quality parameters of coffee grounds and tea grounds, as main components of a potential sustainable fuel. Samples were tested to determine the calorific value, humidity content, amount of sulfur and ash produced in the subsequent process. The research has shown that biomass consisting of coffee and tea grounds may become a high-energy, sustainable solid fuel. Additionally, the possibility of producing pellets from such materials has been tested and a suitable binder, which would allow forming granules of appropriate size, has been selected.