Abstract
A number of carbon-rich (containing up to 47 wt% C) and lime-rich (containing up to 96 wt% of CaO-compounds) waste products from the pulp and paper industries can be used in iron and steel industry as fuels and slag formers for various metallurgical processes such as blast furnaces (BF), cupola furnaces (CF), argon oxygen decarburization (AOD) converters and electric arc furnaces (EAF). In most cases, these wastes consist of different size powders. In order to facilitate loading, transportation and charging of these powder wastes, briquetting is required. In this study, a pulverized AOD slag was tested as a binder component for briquetting of CaO-containing wastes (such as mesa, lime mud and fly ash) from pulp and paper industries. Moreover, mechanical testing of the possibilities for loading, transportation and unloading operations were done, specifically drop test trials were done for briquettes with different chemical compositions and treatments such as heating and storage. The results showed that an addition of 10–20% of AOD slag as a binder component followed by heat-treatment at 850 °C significantly improved the mechanical properties of the CaO-containing briquettes. An application of these briquettes will significantly reduce the consumption of natural resources (such as nature lime) in the metallurgical processes. Moreover, it can reduce the landfill area of wastes from pulp and paper industries, which is important from an environmental point-of-view.
Highlights
IntroductionSweden is one of the biggest producers of pulp and paper in Europe
Metallurgical briquettes were prepared in a laboratory scale by using different CaO-containing waste materials from pulp and paper industries and pulverized argon oxygen decarburization (AOD)
The mechanical properties of the briquettes were studied by using drop testing for different chemical compositions, holding times in air and heat treatment conditions
Summary
Sweden is one of the biggest producers of pulp and paper in Europe. 12.2 million metric tons of pulp and 10.3 million metric tons of paper were manufactured in 2017 [1]. It is well known that the pulp and paper industry generates significant amounts of organic and inorganic wastes. These wastes are usually kept in landfills, which can cause significant environmental problems due to chemical leaching and greenhouse gas emissions. Stronger regulations and requirements with respect to the environment, makes it more difficult and more expensive to dispose waste materials in landfills [3]
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