Calcium oxalate/calcium silicate hydrate (Ca-Ox/C-S-H) from blast furnace slag for the highly efficient removal of Pb2+ and Cd2+ from water

2021 ◽  
Vol 9 (5) ◽  
pp. 106287
Author(s):  
Quynh T.N. Le ◽  
Eleazer L. Vivas ◽  
Kuk Cho
Keyword(s):  
Blast Furnace ◽  
Calcium Oxalate ◽  
Calcium Silicate ◽  
Blast Furnace Slag ◽  
Calcium Silicate Hydrate ◽  
Efficient Removal ◽  
Highly Efficient ◽  
Furnace Slag

scholarly journals Effect of Blast-Furnace Slag Replacement Ratio and Curing Method on Pore Structure Change after Carbonation on Cement Paste

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4787
Author(s):  
Junho Kim ◽  
Seunghyun Na ◽  
Yukio Hama
Keyword(s):  
Blast Furnace ◽  
Calcium Carbonate ◽  
Pore Structure ◽  
Calcium Silicate ◽  
Blast Furnace Slag ◽  
Calcium Silicate Hydrate ◽  
Structure Change ◽  
Replacement Rate ◽  
Replacement Ratio ◽  
Furnace Slag

The frost damage resistance of blast-furnace slag (BFS) cement is affected by carbonation. Hence, this study investigates the carbonation properties of pastes incorporating BFS with different replacement ratios, such as 15%, 45%, and 65% by weight, and different curing conditions, including air and carbonation. The BFS replacement ratio properties, determined by the Ca/Si ratio of calcium silicate hydrate in the cement paste sample, were experimentally investigated using mercury intrusion porosimetry, X-ray diffraction, and thermal analysis. The experimental investigation of the pore structure revealed that total porosity decreased after carbonation. In addition, the porosity decreased at a higher rate as the BFS replacement rate increased. Results obtained from this study show that the chemical change led to the higher replacement rate of BFS, which produced a higher amount of vaterite. In addition, the lower the Ca/Si ratio, the higher the amount of calcium carbonate originating from calcium silicate hydrate rather than from calcium hydroxide. As a result of the pore structure change, the number of ink-bottle pores was remarkably reduced by carbonation. Comparing the pore structure change in air-cured and carbonation test specimens, it was found that as the replacement rate of BFS increased, the number of pores with a diameter of 100 nm or more also increased. The higher the replacement rate of BFS, the higher the amount of calcium carbonate produced compared with the amount of calcium hydroxide produced during water curing. Due to the generation of calcium carbonate and the change in pores, the overall number of pores decreased as the amount of calcium carbonate increased.

Preparation and Characterization of Desulfurization Sorbent from Hydrated Lime and Blast Furnace Slag

2008 ◽  
Vol 368-372 ◽  
pp. 1548-1551
Author(s):  
Guo Zhuo Gong ◽  
Shu Feng Ye ◽  
Feng Li ◽  
Yan Bin Cui ◽  
Ya Jun Tian ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Flue Gas ◽  
Calcium Silicate ◽  
Blast Furnace Slag ◽  
Hydrated Lime ◽  
Experiment Design ◽  
Factorial Experiment ◽  
Calcium Silicate Hydrates ◽  
Furnace Slag

A series of sorbents for SO2 in flue gas were prepared from hydrated lime and blast furnace slag using a factorial experiment design. It is found that the reaction between hydrated lime and blast furnace slag is fast. The reactivities of the as-prepared sorbents are higher than those of hydrated lime alone due to the formation of calcium silicate hydrates, and hence the utilization of hydrated lime as well as the Ca in the blast furnace slag is improved. Furthermore, the effects of preparation variables on the reactivity of the sorbents are also discussed.

Mechanical Properties and Microstructure Analysis of Copper Tailings Solidifying with Different Cementitious Materials

2014 ◽  
Vol 878 ◽  
pp. 171-176 ◽  
Author(s):  
Xu Quan Huang ◽  
Hao Bo Hou ◽  
Min Zhou ◽  
Wei Xin Wang
Keyword(s):  
Mechanical Properties ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Calcium Silicate Hydrate ◽  
Steel Slag ◽  
Cementitious Materials ◽  
Cementitious Material ◽  
Hydration Products ◽  
New Type ◽  
Furnace Slag

With new type steel slag-blast furnace slag-fluorgypsum-based cemented material, P O42.5 cement, commonly used cementation agent in China, mechanical properties and microstructure of tailings solidification bodies are studied. The hydration products and morphology tailings concretion body in 60 days are analyzed by SEM and XRD test, which reveals the tailings cementation mechanism solidifying with different cementitious material. Furthermore, a large number of slender bar-like ettringite crystals and filamentous network-like calcium-silicate-hydrate gels bond firmly each other, which is the most important reason why steel slag-blast furnace slag-fluorgypsum base cemented material has the best tailings cementation mechanical properties.

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