Characteristics of Artificial Lightweight Aggregate by Using Magnetic Separated Desulfurized Fly Ash and Dredged Soil

2012 ◽  
Vol 724 ◽  
pp. 119-122
Author(s):  
Yoo Taek Kim ◽  
Chang Sub Jang ◽  
Ki Gang Lee ◽  
Joon Seong Lee
Keyword(s):  
Fly Ash ◽  
Fluidized Bed ◽  
Magnetic Separation ◽  
Glass Phase ◽  
Sintering Temperature ◽  
Raw Materials ◽  
Physical Property ◽  
Lightweight Aggregate ◽  
Dredged Soil ◽  
Coal Power

This research concerns the characteristics of ALA made of magnetically separated desulfurized fly ash (DFA) generated from the coal power plant having fluidized bed type boiler. Being believed that these alkali-rich components could be separated by magnetic separation, desulfurized fly ash was separated by using 10,000 Gauss magnets as magnetic desulfurized fly ash (MDFA) and non-magnetic desulfurized fly ash (DFA). The dependence of composition and sintering temperature on physical property of ALA was studied. It seems to be apparent that the glass phase which is one of the main problems in the ALA manufacturing process could not be controlled by the magnetic separation only, but the formation of pores could be considerably controlled by the magnetic separation. It is also clear that neither DFA nor MDFA can be used as raw materials for making ALA; however, magnetic separation of desulfurized fly ash from fluidized bed type boiler is effective to collect bloating components for self-bloating of ALA without addition of an extra bloating agent.

Properties of Artificial Lightweight Aggregate by Using Magnetic Separated Bottom Ash from Coal Power Plant

2012 ◽  
Vol 724 ◽  
pp. 103-106
Author(s):  
Yoo Taek Kim ◽  
Chang Sub Jang ◽  
Yun Jae Choi
Keyword(s):  
Power Plants ◽  
Raw Materials ◽  
Bottom Ash ◽  
Lightweight Aggregate ◽  
Raw Material ◽  
Dredged Soil ◽  
Magnetic Components ◽  
Coal Power Plants ◽  
Coal Power ◽  
Lower Bulk Density

This study was conducted to evaluate the feasibility of using bottom ash after magnetic separation and dredged soil from the coal power plants as raw materials for artificial lightweight aggregate (ALA). The dependence of composition and sintering temperature on physical properties of ALA was investigated. Fe compounds play an important role in the bloating reaction, thus specimens containing more ferrous materials such as Fe3O4 are more easily bloated. Both black core region and bloating phenomenon were increased with an increase in the contents of dredged soil. Specimens made use of MBA(Magnetic separated bottom ash which has magnetic components) showed lower bulk density than those of NMBA(non-magnetic separated bottom ash which has much less ferrous materials. It was confirmed that MBA could be used as an effective raw material for making ALA having low density because the ferrous components in it act as bloating agents.

Concrete with Fluidized Bed Combustion Fly Ash Based Light Weight Aggregate

2016 ◽  
Vol 249 ◽  
pp. 8-13
Author(s):  
Rudolf Hela ◽  
Martin Ťažký ◽  
Václav Vachuška ◽  
Tomáš Ťažký
Keyword(s):  
Fly Ash ◽  
Fluidized Bed ◽  
Building Materials ◽  
Lightweight Concrete ◽  
Raw Materials ◽  
Construction Materials ◽  
Lightweight Aggregate ◽  
Fluidized Bed Combustion ◽  
Freezing And Thawing ◽  
Long Time

Conventional high temperature fly ash has been used for manufacturing of construction materials, concrete in particular, for quite a long time. Fluidized bed combustion fly ash, however, has little use in this area, mainly for its chemical composition and morphology. Current efforts are directed towards the development of new technological processes and building materials that would allow the use of this industrial waste and its qualities. One possible way of fluidized bed combustion fly ash’s utilizing in construction industry is the production of cold balled lightweight aggregate. Production of this material is economically advantageous and enables processing of large volumes of raw materials. This paper describes possibilities of using this aggregate for production of lightweight concrete of lower compressive strength classes and consequent testing of durability and resistance to various types of aggressive environment and cyclical freezing and thawing. Physico-mechanical properties and microscopic defects were also studied

Physico-Mechanical Properties of Lightweight Concrete with Fluidized Bed Combustion Fly Ash Based Light Weight Aggregate

2017 ◽  
Vol 908 ◽  
pp. 106-110 ◽  
Author(s):  
Martin Ťažký ◽  
Lenka Bodnárová ◽  
Rudolf Hela
Keyword(s):  
Fly Ash ◽  
Fluidized Bed ◽  
Building Materials ◽  
Lightweight Concrete ◽  
Raw Materials ◽  
Lightweight Aggregate ◽  
Fluidized Bed Combustion ◽  
Lightweight Construction ◽  
Technical Parameters ◽  
Light Weight Aggregate

Increasingly we see today among the conventional high temperature fly ash also with the production of fly ash from fluidized bed combustion. These fluidized bed combustions fly ashes, however, have little used this area, mainly for their chemical composition and morphology. Current efforts are directed towards the development of new technological processes and building materials that would allow the use of this industrial waste and its qualities. One possible way of fluidized bed combustion fly ash’s utilizing in construction industries the production of cold balled lightweight aggregate. Production of this material is economically advantageous and enables processing of large volumes of raw materials. This paper describes possibilities of using this aggregate for production of lightweight construction concrete and consequent testing of durability and resistance to various types of aggressive environment. For these lightweight structural concretes, will be verified in their thermal-technical parameters.

Innovative Synergistic Valorization of Lignite Fly Ash and Steel Industry Scrap-Soil as Secondary Resources for Compacted Ceramics

2015 ◽  
Vol 660 ◽  
pp. 268-272 ◽  
Author(s):  
V. Karayannis ◽  
G. Papapolymerou ◽  
S. Zaoutsos ◽  
S. Lamprakopoulos ◽  
K. Ntampegliotis ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Steel Industry ◽  
Sintering Temperature ◽  
Raw Materials ◽  
Hydraulic Press ◽  
Power Station ◽  
Secondary Resources ◽  
Lignite Fly Ash ◽  
Diametral Tensile Strength

In the present research, the combined utilization of fly ash (FA), derived from a lignite-fed power station, along with scrap-soil (SS), a steel industry by-product, is investigated, for the development of eco-friendly ceramics, thus enhancing innovation and sustainability. The valorization of these low price and largely available industrial secondary resources as 100% the raw materials mixture in ceramic industry arises interesting technological, environmental and economical benefits. FA and SS were mixed in various proportions (0-70%wt. in SS), cold compacted at 20 tn load using an automated hydraulic press to form a series of 5 cm diameter disc-shaped specimens, and finally sintered at three different peak temperatures (1000oC, 1100oC and 1140oC) for 3h. Then, the specimen microstructure and physico-mechanical properties were characterized. According to the experimental results, a sintering temperature increase from 1000°C up to 1140oC significantly improves specimen densification, thus sharply enhancing the diametral tensile strength (DTS), from 0.5 MPa up to 12.8 MPa respectively for a 50-50%wt. FA-SS mixture. Mechanical strength also varies with the SS percentage in the raw materials. Physico-mechanical properties seem to be constant for specimens containing SS up to 60% at 1140oC.

Study on Preparation of a New Foamed Cement Material

2013 ◽  
Vol 648 ◽  
pp. 104-107
Author(s):  
Chuan Wei Du ◽  
Guo Zhong Li
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fly Ash ◽  
Ordinary Portland Cement ◽  
Raw Materials ◽  
Lightweight Aggregate ◽  
Foaming Agent ◽  
Cement Material ◽  
Foam Stabilizer ◽  
Scanning Electron

The ordinary Portland cement as matrix materials and fly ash as a lightweight aggregate were used to prepare a new foamed cement material by chemical foaming method though adding a proper level of foaming agent, foam stabilizer, and glass fiber. The raw materials’ ratio of new foamed cement was determined through the experiment. The microstructure of bubble was analysed by electronic scanning electron microscopy. The mechanism of foam stabilizer and fiber reinforced mechanisms were explored.

The Effect of Sintering Temperature on Physical Properties of Leucite Ceramics

2019 ◽  
Vol 891 ◽  
pp. 214-218
Author(s):  
Jirasak Tharajak ◽  
Noppakun Sanpo
Keyword(s):  
Thermal Expansion ◽  
Research Study ◽  
Sintering Temperature ◽  
Coefficient Of Thermal Expansion ◽  
Raw Materials ◽  
Sol Gel ◽  
Physical Property ◽  
Dental Ceramics ◽  
Ceramic Particles ◽  
Sol Gel Process

Leucite has been widely used as a constituent of dental ceramics to modify the coefficient of thermal expansion. This is most important where the ceramic is to be fused or baked onto metal. However, its physical property was unpredictable since it was sensitive to several parameters such as sintering temperature and concentration of raw materials. In this research study, leucite ceramic particles were synthesized by in-house sol-gel process. The morphology and size of our synthesized leucite particles were analyzed by SEM, vicker hardness and XRD, respectively. It was revealed that the sintering temperature played the important role on several properties of leucite ceramic particles.

scholarly journals Volcanic Mud Incorporating Paper Sludge as Raw Materials for Lightweight Aggregates

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1511
Author(s):  
Chung-Ho Huang ◽  
Hao-Yu Fang ◽  
Han Chen
Keyword(s):  
Water Absorption ◽  
Sintering Temperature ◽  
Particle Density ◽  
Raw Materials ◽  
Lightweight Aggregate ◽  
Firing Process ◽  
Paper Sludge ◽  
Crushing Strength ◽  
Southern Taiwan ◽  
Sintering Mechanisms

This study assessed the use of volcanic mud collected from southern Taiwan and the incorporation of paper sludge for manufacturing lightweight aggregate (LWA). The firing process of the raw materials and related sintering mechanisms, including sintering temperature and time, were investigated. LWA was manufactured at sintering temperatures ranging from 950 to 1275 °C with soaking times from 2 to 15 min, and preheating temperatures ranged between 500 and 700 °C with soaking times from 5 to 15 min. Using volcanic mud and mixed sludge (volcanic mud with added paper sludge) resulted in the successful manufacture of various qualified LWAs with particle density ranging from 973 to 1950 g/cm3, water absorption from 6.2 to 20.0%, and crushing strength from 2.2 to 15.8 MPa.

scholarly journals Microstructural evolution of h-BN matrix composite ceramics with La-Al-Si-O glass phase during hot-pressed sintering

2020 ◽  
Author(s):  
Baofu Qiu ◽  
Xiaoming Duan ◽  
Zhuo Zhang ◽  
Chen Zhao ◽  
Bo Niu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Elastic Modulus ◽  
Microstructural Evolution ◽  
Glass Phase ◽  
Sintering Temperature ◽  
Raw Materials ◽  
Sintering Process ◽  
Composite Ceramics ◽  
Phase Precipitation

Abstract BN/La-Al-Si-O composite ceramics were fabricated by hot-pressed sintering using h-BN, La2O3, Al2O3 and amorphous SiO2 as the raw materials. The effects of sintering temperature on the microstructural evolution, bulk density, apparent porosity, and mechanical properties of h-BN composite ceramics were investigated. The results indicated that La-Al-Si-O liquid phase was formed during sintering process, which provided an environment for the growth of h-BN grains. With increasing sintering temperature, the cristobalite phase precipitation and h-BN grain growth occurred at the same time, which had the significant influence on the densification and mechanical properties of h-BN composite ceramics. The best mechanical properties of BN/La-Al-Si-O composite ceramics were obtained under sintering temperature of 1700 °C, and the elastic modulus, flexural strength, and fracture toughness were 80.5 GPa, 266.4 MPa and 3.25 MPa·m1/2, respectively.

Effect of Sintering Temperature on the Properties of Sludge Ceramics and Fly-Ash Ceramics

2010 ◽  
Vol 150-151 ◽  
pp. 1068-1072
Author(s):  
Min Yue ◽  
Qin Yan Yue ◽  
Yuan Feng Qi
Keyword(s):  
Fly Ash ◽  
Sewage Sludge ◽  
Physical Properties ◽  
Sintering Temperature ◽  
Raw Materials ◽  
Control Factor ◽  
Sintering Process ◽  
Technical Parameters ◽  
Sintering Mechanism ◽  
Starting Point

The object of this study is to investigate the sintering mechanism of lightweight ceramic by different sintering temperature. The raw materials were sewage sludge and fly-ash, and clay was added as cementing agents (by ratio of 50wt% in each sample). The raw materials were mixed and pressed into raw pellets. After drying and preheating treatment, the raw pellets were sintered at temperatures ranging from 1050 to 1150 , in 25 increments for 10min. The physical properties (bulk density, grain density, water absorption and rate of expansion) were the indexes used to determine the technical parameters for the preparation of lightweight ceramic pellets and investigate the sintering mechanism of bloating. The results suggested that temperature was the key control factor of sintering process, and 1150 was the starting point of bloating reaction. Observation of the microstructure by SEM indicated that a higher flux content in the raw materials could lower the melt point during sintering process.

Use of Fly Ash as Bonding Material on Low Thermal Expansion Porous Materials

2010 ◽  
Vol 658 ◽  
pp. 276-279
Author(s):  
Isaías Juárez-Ramírez ◽  
Antonio Zaldivar-Cadena ◽  
Leticia M. Torres-Martínez ◽  
Santiago I. Suárez-Vázquez ◽  
Astrid Sánchez-Vázquez ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Fly Ash ◽  
Porous Materials ◽  
Ball Milling ◽  
Mechanical Milling ◽  
Sintering Temperature ◽  
Raw Materials ◽  
Bonding Material ◽  
Low Thermal Expansion ◽  
Planetary Ball Milling

In this work it was determined the effect of fly ash (FA) as bonding material during the fabrication of low thermal expansion porous materials. SiC, fly ash, Vitrified Bonding Material (VBM), and LiAlSiO4 powders were used as raw materials. Porous materials were sintered at 850°C and 950°C after manual milling and mechanical milling in a planetary ball milling at 800 RPM. SEM micrographs showed the presence of porous materials, and it was observed that fly ash particles did not melt at 850°C. However if sintering temperature increases at 950°C, FA starts to melt and it is forming bridges between SiC particles. Thermal expansion values were around 3.0x10-6 K-1. According to these results, it seems that it is possible to have a favorable synergy between FA and VBM to fabricate SiC porous materials with low thermal expansion values.

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