Abstract
SiC was chosen as the foaming agent, and river bottom silt, waste oil sludge, paint bucket slag, and fly ash were used as raw materials, to prepare lightweight ceramsite without adding any chemical additives. The effects of SiC dosing and sintering temperature on various properties of the ceramsite were studied, and the pore-forming mechanism of the lightweight ceramsite was clarified by thermal analysis and X-ray diffraction analysis. The results showed that the single ceramsite compressive strength, water absorption, bulk density, and porosity of ceramsite sintered at 1180 °C with 1.0% SiC were 2.15 MPa, 2.02%, 490 kg/m3, and 23.85%, respectively. The major mineralogical compositions were quartz, fayalite, and kyanite, with small amounts of albite-low from 1140 to 1190 °C. Furthermore, the concentration of all tested heavy metals from ceramsite was lower than the maximum allowable concentration of the leaching solution specified in the Chinese national standard (GB 5085.3-2007), which reveals that this solid waste ceramsite will not cause secondary environmental pollution. The prepared ceramsite, exhibiting lower bulk density, high water absorption and porosity, and effective solidification of deleterious elements, can be used to prepare green lightweight aggregate concrete. Importantly, preparation of solid waste ceramsite is an effective way to dispose of hazardous wastes.
Highlights
With the continuous global advancement of industrialization and urbanization, a variety of solid wastes harmful to the environment are increasingly being produced, such as fly ash, sludge, steel slag, etc. [1,2]
The large amount of silica-aluminous substances and other alkaline melts contained in solid waste are similar to the chemical components required for sintered ceramsite, and the preparation of ceramic pellets can be achieved by the reaction between different solid wastes
In order to determine the optimum SiC content, a raw material ratio of 20% river bottom silt (RBS), 10% oil mud (OM), 20% paint bucket slag (PBS), and fly ash (FA) 50% was used for sintering at 1180 ◦ C for 20 min with different SiC dopings
Summary
With the continuous global advancement of industrialization and urbanization, a variety of solid wastes harmful to the environment are increasingly being produced, such as fly ash, sludge, steel slag, etc. [1,2]. [1,2] Most of these solid wastes contain large amounts of alkaline substances and heavy metals due to their production conditions, and can cause secondary pollution and threats to human health when handled and used [3,4]. To address the issue of the increasing amount of solid wastes and the need for environmentallyfriendly uses, new strategies need to be urgently devised for the utilization of solid wastes. The large amount of silica-aluminous substances and other alkaline melts contained in solid waste are similar to the chemical components required for sintered ceramsite, and the preparation of ceramic pellets can be achieved by the reaction between different solid wastes. More than 95% of ceramsite will use solid waste as raw material for production [9]
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