Related Experiment Video
Updated: Jun 23, 2026

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
Published on: February 21, 2017
Ceramsite obtained from water and wastewater sludge and its characteristics affected by
1State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China. xgr@hit.edu.cn
Abstract:
To control and optimize the process for making ceramsite from wastewater treatment sludge (WWTS) and drinking-water treatment one (DWTS), the effect of mass ratios of (Fe(2)O(3)+CaO+MgO)/(SiO(2)+Al(2)O(3)) (defined as F/SA ratios); SiO(2):Al(2)O(3) and Fe(2)O(3):CaO:MgO (under the condition of fixed F/SA ratio) on the characteristics of ceramsite were investigated. It was found that the optimal F/SA ratios for making ceramsite range 0.175-0.45. Na-Ca feldspars and amorphous phases increase in ceramsite as F/SA ratios increase. Ceramsite with porous surfaces, expanded structures, and complex crystalline phases can be obtained at 0.275=F/SA=0.45, which accordingly cause the decrease in compressive strength. Higher strength of ceramsite with lower porosity can be obtained at 0.175=F/SA<0.275, and under the condition of F/SA ratio=0.275, the raw materials can produce ceramsite with desired physical properties at 18.2:35=SiO(2):Al(2)O(3)=45:10.2 and 10:2.7:1.4=Fe(2)O(3):CaO:MgO=5.3:6:1.6. Ceramsite with higher compressive strength and lower porosity can be obtained at SiO(2):Al(2)O(3)>27.2:15.8 and Fe(2)O(3):CaO:MgO>6:3.5:1.8. Results indicate that F/SA ratios could be used as an important parameter to control the production process of ceramsite with desired physicochemical properties and resolve the disposal problems of residual sludges.
More Related Videos
08:29Multi-material Ceramic-Based Components – Additive Manufacturing of Black-and-white Zirconia Components by Thermoplastic 3D-Printing (CerAM - T3DP)
Published on: January 7, 2019
06:53Additive Manufacturing of Functionally Graded Ceramic Materials by Stereolithography
Published on: January 25, 2019
Related Concept Videos
Hydration of Cement
Pozzolans
Fly ash is a...
Sulfate Attack on Concrete
Sulfates from sources like soil, groundwater, or industrial effluents...
Types of Cement II
Strength and Heat of Hydration
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
Water Cement Ratio