Microstructure and mineralogy of lightweight aggregates manufactured from mining and industrial wastes

Abstract

Keywords:Lightweight aggregate Microstructure MineralogyThe microstructure and mineralogy of lightweight aggregates manufactured with washing aggregate sludge, sewage sludge and a clay-rich sediment have been studied. The mineralogical analysis revealed the neo-formation of plagioclase and pyroxene group minerals and a minor presence of gehlenite. Some relationships may be established: (i) heating temperature and dwell time affect the formation of new porosity; (ii) the disappearance of pyroxenes could produce changes in the density of the solid material in the lightweight aggregates; (Hi) when an external glassy film is not present, water absorption values depend on the size and number of each type of pore.Washing aggregate sludge Sewage sludge Clay-rich sediment

Chemical Processes During Energy‐Saving Preparation of Lightweight Ceramics

“…As an alternative approach, the methods of production of lightweight building materials without preliminary glass preparation have been developing extensively. The typical raw materials used in these methods are waste products such as various ashes and washing aggregate sludge . Production consists of three steps: grinding of the raw materials, mixing with fusing agents (H 3 BO 3 or NaOH), and sintering at the temperature of pore formation.…”

Effects of recycled paperboard mill wastes on the properties of non-load-bearing concrete

“…A paper from Taiwan has used metal sludge mixed with mining residues to be recycled into lightweight aggregate (Huang et al 2007). A work from Spain has utilized mining and industrial wastes to produce lightweight aggregate (González Corrochano et al 2011). Sutcu et al (2014) investigated the thermal behavior of hollow clay bricks made up of paper waste.…”

Preparation of Sound‐Insulating Lightweight Ceramics from Aluminosilicate Rocks with High CaCO3 Content

“…As an alternative energy‐saving approach, the methods of production of lightweight building materials without preliminary glass preparation have been developing extensively. The typical raw materials used in these methods are waste products such as various ashes and washing aggregate sludge . Disadvantages of such methods are high bulk density (>1 g/cm 3 ) of resulting lightweight material and high sintering temperature (>1000°C).…”