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The "Re-dust" project was born from the idea of the Research & Development Team of Ellequadro Ingegneria srls, a company successfully present in the design, authorization and development of companies operating in the waste sector. The company wanted to focus attention on the product fractions within the fraction of undifferentiated waste produced in domestic homes. Attention was paid to the percentage share deriving from cleaning and daily household sweeping. The design concept lays its foundations on the theory of recycling as a source of innovation, energy saving and social well-being and aims to identify every single undifferentiated fraction and determine a new use. [ABSTRACT FROM AUTHOR]

Magnesium production by Pidgeon process has been developed very fast in China since 1990's. The waste slag from magnesium production has attracted broad attention because the huge amounts of the slag. For each ton of magnesium produced, there will be 6-8 tons of the slag generated. A big part of the Mg slag exists as fine dust with particle size of D95 < 0.1mm, which may pollute air, soil and water surrounding the Mg industry. The fine particles are generated by phase transformations of dicalcium silicate C2S (2CaO·SiO2) during the slag cooling. There is a volume expansion of more than 10% with the transformation of β-C2S to γ-C2S phase, causing a disintegration or dusting of the Mg slag. In the present study, several chemical stabilizers were used to treat the dusting Mg slag at 1200°C, including borates, phosphates and rare earth oxides, in order to obtain volume stable slag aggregates for environmental protection and recycling of the Mg slag. The volume expanding rates of the samples were measured. XRD and SEM studies were carried out to confirm effects of the stabilizers. The results show that all of the stabilizers were effective for the stabilization of Mg slag. Some differences between the stabilizers were also described and discussed. [ABSTRACT FROM AUTHOR]