Utilization of Carbide Slag by Wet Grinding as an Accelerator in Calcium Sulfoaluminate Cement

Abstract

In this study, wet-ground carbide slag (i.e., WGCS) was utilized as an accelerator in calcium sulfoaluminate cement (CSA) for obtaining considerably faster setting processes for some special engineering processes such as plugging projects and rapid repair engineering. The WGCS–CSA system was designed, in which the replacement ratio of CSA by carbide slag was chosen as 4%, 8% and 12%. The setting time and compressive strength were measured, and the mechanism of the system hydration was studied in detail by means of calorimetry, XRD, thermogravimetry (TG) and SEM. The results showed that WGCS shortened the setting time of cement and significantly augmented the early strength. The addition of 8% of WGCS contributed to increasing the 2-h compressive strength from 4.2 MPa to 32.9 MPa. The decrease in the setting time and the increase in the initial strength were mainly attributed to the high initial pH value of the liquid phase and the high content of calcium ions in WGCS. Both these factors contributed to the ettringite formation and, at the same time, to the transformation of the morphology at a later time. Such results testify that WGCS can be used as an accelerator in the CSA system and also that it provides a novel approach to the reutilization of carbide slag.

A Hierarchical Strengthening Path for Chemical Foaming: The Transformation toward Sustainable High-Performance Foamed Material Derived from Solid Waste

“…Within the sulfoaluminate cement system, introducing CS helps regulate the solidification process and compacts the microstructure Figure a–c shows how CS affects the fluidity, setting time, and rheological behavior of the fresh paste.…”

The Experimental Study of Innovative Methods Regarding the Removal of Sm(III)

“…Therefore, to date, about 250 rare earth minerals have been found in more than 30 countries and regions. As a result of the low concentration, rare earth elements are formed as a by-product during the processing of various ores or are extracted from processed tailings or residues [36][37][38][39][40][41].…”

Complex Processing of Saponite Waste from a Diamond-Mining Enterprise

“…The aluminosilicate obtained with calcium also has improved qualities for use in building materials and other kinds of secondary products. The production of building materials is a significant consumer of that kind of raw material and can make a significant contribution to recycling sludge from saponite waste treatment [31]. Cement composites make up the main share in the production of materials, so the involvement of secondary resources in their production is relevant [32,33].…”