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Recovering oxides from construction waste as an alternative raw material for the production of cement clinker
Published in Zoltán Bartha, Tekla Szép, Katalin Lipták, Dóra Szendi, Entrepreneurship in the Raw Materials Sector, 2022
Katarzyna Styk, Olga Świniarska
For this article, we will focus on the first of the steps, the sourcing of raw materials. To make the sourcing of raw materials as sustainable as possible, it is necessary to adhere to a few key principles: choosing renewable, recyclable or biodegradable materials; reclamation of degraded areas; sustainable and responsible sourcing of raw materials [8, 11]. One of the 3 principles of the Circular Economy proposed in November 2015 by the Ellen MacArthur Foundation is: Preserve and enrich natural capital by controlling finite stocks and balancing renewable resource streams. The basis of this principle is to control the management of renewable, non-renewable resource streams and their stocks. The most important assumption of this principle is to minimize the demand for non-renewable resources and substitute them with renewable resources. Moreover, if it is necessary to use a non-renewable raw material, the system should make a careful selection and choose the technology in such a way as to maximize the efficiency of the selected raw material. Such action is expected to help reduce environmental degradation and allow, for example, soil regeneration [5, 9]. Therefore, sourcing raw materials for production is one of the most important elements of the product life cycle.
Eco-friendly deicer prepared from waste oyster shells and its deicing properties with metal corrosion
Published in Environmental Technology, 2021
Kyong-Hwan Chung, Sang-Chul Jung, Byung-Geon Park
WOS can be reused in several applications. The principal component (∼96%) of oyster shells is CaCO3, which can be used in the construction industry, as an aggregate of limestone for cement, in the pharmaceutical industry, as a calcium-enriched supplement [5], in soil regeneration, as an arsenic immobilizer in highly contaminated soils [6], in soil quality improvement, as a heavy metals stabilizer in soil [7], and in the preparation of CaO-based sorbents for CO2 capture [8]. Oyster shells are considered an important recycling resource to replace finite limestone resources. Active research on lung oyster shells was carried out mainly for phosphate removal [9], concrete aggregates and backfills [10], sand mixtures [11], cement mortars and clinkers [12], filter beds and heat retardant coatings [13], eutrophication control [14] and algae and phosphorus removal [15]. Waste oyster shell was used in the preparation of vitrocrystalline foams [16].