STUDY ON PROPERTIES OF FLY ASH REMOVED UNBURNED CARBON BY FLOTATION METHOD

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Yuta Niimura ◽  
Koji Takasu ◽  
Hiroki Suyama ◽  
Hidehiro Koyamada
Keyword(s):  
Fly Ash ◽  
Chemical Composition ◽  
Physical Properties ◽  
Treatment Time ◽  
Activity Index ◽  
Unburned Carbon ◽  
Pine Oil ◽  
Addition Rate ◽  
Flotation Method ◽  
Pre Treatment

When we use the fly FA-As a concrete admixture, it is known that the properties of the concrete improve. But when we made concrete with fly FA-Fresh property of concrete is adversely affected by unburnt carbon in the fly ash. If there are much quantities of unburnt carbon in the fly ash, they inhibit air entraining performance and fluidity of flesh concrete. So we developed the device removing unburnt carbon from the fly FA-By flotation method in previous studies. It was succeeded remove of unburnt carbon in the fly FA-And to clean the surface of the fly FA-By used the developed device removing unburnt carbon in the fly FA-By flotation method. In this study, it was purpose to confirm the change in the composition and physical properties between the original fly FA-And the reformed fly FA-By flotation method, and to grasp the effects that the physical properties of fly FA-Gave to the unburnt carbon removal when using flotation method. As a result, the specific surface area of reformed fly ash is larger than original fly ash. However, the change of chemical composition for reformed fly FA-By flotation method was as small as 4% at the maximum. It was considered that the addition rate of kerosene and pine oil and the pre-treatment time were changed by difference in sizes and shapes of unburnt carbon in the fly ash. Percent flow and activity index were influenced by the different of physical properties of original fly ash.

The Effect of Substituting Rdf on the Physical and Environmental Properties of Coal Fly Ash

1988 ◽  
Vol 136 ◽  
Author(s):  
Ashaari B. Mohamad ◽  
David L. Gress
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Physical Properties ◽  
Activity Index ◽  
Coal Fly Ash ◽  
Pozzolanic Activity ◽  
Portland Cement Concrete ◽  
Fly Ash Concrete ◽  
Refuse Derived Fuel ◽  
Cadmium And Lead

ABSTRACTRefuse-derived-fuel (RDF) consisting mainly of waste paper and plastics is a viable fuel source for the production of power. An experimental test burn partially substituting coal with RDF was undertaken by the Public Service of New Hampshire at the Merrimack Power Station.Five percent and ten percent RDF were substituted, on a BTU basis, for coal in the test bums. The chemical and physical properties of the resulting fly ash were determined. Twelve test burn days were run with 4 days of 5% RDF and 8 days of 10% RDF. Emphasis was placed on investigating the effect of the RDF fly ash on Portland cement concrete.Most of the chemical and physical properties of the coal-RDF fly ash were found to be comparable with ordinary coal fly ash except for the amount of cadmium and lead, the pozzolanic activity index and the compressive strength of fly ash concrete. Cadmium and lead were at average levels of 5.1 ppm and 102.6 ppm for the 5% RDF, and 7.8 ppm and 198.3 ppm for the 10% RDF, respectively. Although the pozzolanic activity index of coal-RDF fly ash increases over normal coal fly ash, preliminary results show that the 28-day compressive strength of concrete with direct replacement of cement and sand decreases by up to 30%. Leaching tests on crushed concrete were conducted to evaluate the environmental effect of acid rain.

Comparative Study of Yield, Chemical Composition and Antioxidant Activity of Wild Algerian Lavandula stoechas L. Obtained by Ultrasound Pre-treatment and by Conventional Hydrodistillation

2018 ◽  
Vol 16 (S1) ◽  
pp. S109-S118 ◽  
Author(s):  
L. Chekoual ◽  
A. Aissat ◽  
K. Ait-Kaci Aourahoun ◽  
T. Benabdelkader
Keyword(s):  
Antioxidant Activity ◽  
Chemical Composition ◽  
Essential Oils ◽  
Treatment Time ◽  
Quantitative Difference ◽  
Flame Ionization ◽  
Lavandula Stoechas ◽  
Two Samples ◽  
Pre Treatment ◽  
Two Populations

The paper presents research results concerning the influence of ultrasonic pre-treatment (time intervals of 10, 20, 30, 45, and 60 min) on the process of extraction of essential oils from wild Algerian Lavandula stoechas. Tests were carried out in two populations. A sonication pre-treatment time of 10 min followed by 90 min of hydrodistillation (US-HD) gives a yield of 1.60 ± 0.1% of Kodiat essential oils (KEO). This pre-treatment time proved to be the best when compared with other pretreatment times. However, overall best yield (1.03 ± 0.07%) of El-Kahla essential oils (EEO) was obtained at 60 min of pre-treatment. These yields are higher compared with those (0.64 ± 0.02% and 0.50 ± 0.02%) obtained after 180 min of only hydrodistillation (HD) for the two samples of Lavandula stoechas, respectively. About 90.69% and 89.36% of total compounds were identified using chromatography–mass spectrometry (GC– MS) in KEO and EEO treated by ultrasound versus untreated samples (89.26% and 76%, respectively). A qualitative and quantitative difference in chemical composition between the essential oils of treated and untreated samples of the two harvesting sites was found. The percentage of most of the major compounds (fenchone, camphor, 1,8-cineole, bornylacetate, myrtenyl-acetate, and viridiflorol) and other compounds identified is higher in treated samples. GC/FID (flame ionization detector) analysis of KEO showed that the percentage of fenchone and camphor as major components is greater at 60 and 20 min of ultrasonic (US) pretreatment, respectively, compared with HD and the other US pre-treatment times. Results of the present study clearly indicated that sonication treatments are effective in enhancing the antioxidant activity of Lavandula stoechas extracts and could be further explored for commercial purposes to benefit consumers and the environment.

scholarly journals Development of Flotation Device for Removing Unburnt Carbon in Fly Ash for Use in Hardened Cementitious Materials

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6517
Author(s):  
Hangwei Lin ◽  
Koji Takasu ◽  
Hidehiro Koyamada ◽  
Hiroki Suyama
Keyword(s):  
Elastic Modulus ◽  
Fly Ash ◽  
Drying Shrinkage ◽  
Cementitious Materials ◽  
Unburned Carbon ◽  
Ordinary Concrete ◽  
Circulating Water ◽  
Micro Bubble ◽  
Concrete Mixer ◽  
Flotation Method

The unburned carbon in fly ash inhibits the performance of concrete. A device using the flotation method to remove unburned carbon in fly ash was developed, and the operating condition of the device was experimentally examined. According to the results, the device was able to remove unburnt carbon from fly ash by using the installed micro bubble nozzles and a whirl-type pump. The removal efficiency of unburnt carbon improved when prior forced stirring was carried out by a concrete mixer for 3 min, and a scavenger was added into the fly ash slurry at a density of about 60 wt%. It has also been confirmed that the method of circulating water is more effective than the method of not circulating water. The elements of the modified fly ash slurry (MFAS) have also been experimentally confirmed as not being too different from untreated fly ash, except for the fact that the content of unburned carbon is reduced. The compressive strength and drying shrinkage characteristics of concrete made with MFAS were investigated. The use of MFAS will reduce the performance of concrete compared to that of ordinary concrete. This shows that in a certain range (15–30%), the influence of MFAS on drying shrinkage is constant. The static elastic modulus and dynamic elastic modulus were also investigated. The above results show that the application of MFAS prepared by the flotation method to concrete is feasible.

Quality analysis and prospects for use of lupin seeds of Belarusian selection

2020 ◽  
Vol 3 (1) ◽  
pp. 22
Author(s):  
Lyudmila Rukshan ◽  
Alena Navazhilova ◽  
Dmitry Kudin
Keyword(s):  
Chemical Composition ◽  
Physical Properties ◽  
Wheat Flour ◽  
Great Influence ◽  
Quality Analysis ◽  
Bakery Products ◽  
Whole Grain ◽  
Technological Parameters ◽  
Protein Food ◽  
Lupin Seeds

The paper investigates technological parameters of the quality of low-alkaloid lupin of five cultivars selected and grown in the Republic of Belarus during the years from 2007 to 2017. Prospects for the use of the obtained seeds have been studied. This study reveals great influence of cultivar and climatic conditions during growth of lupin seeds on correlation of anatomic parts in seeds as well as on their physical properties. Cultivar of lupin seeds Jan is recommended for whole grain flour and graded flour production based on its anatomic composition, uniformity and physical properties. A comparative analysis of chemical composition, quality parameters and technological properties of lupin flour has been done. The chemical composition of lupin flour, of whole grain lupin flour, in particular, has been found to be relatively low in starch, high in protein, food fibers, minerals and organic acids. As a result, whole grain lupin flour has been proved to have higher food value when compared to traditional wheat flour. This paper demonstrates the difference between lupin flour characteristics and those of wheat flour in terms of color, acidity, enzymatic activity and adsorbing properties. This study reveals the possibility of use of lupin flour in bakery products by substituting traditional types of flour with lupin flour at 10-30% levels, as well as by replacing egg products with lupin flour at 25-50% levels. The work highlights the use of lupin flour at the stages of dough kneading, dough preparation, foam and emulsion production mainly by using rapid dough making methods.Practical applicationsRecommendations have been made on the usage of lupin flour in the technological process of bakery products manufacturing, macaroni and flour confectionery products production.

NICROFER 5520 Co

Alloy Digest ◽  
1995 ◽  
Vol 44 (3) ◽  
Keyword(s):  
High Temperature ◽  
Chemical Composition ◽  
Physical Properties ◽  
Tensile Properties ◽  
High Temperatures ◽  
Heat Treating ◽  
High Temperature Corrosion ◽  
Creep Properties ◽  
Nickel Chromium ◽  
Temperature Performance

Abstract NICROFER 5520 Co is a nickel-chromium-cobalt-molybdenum alloy with excellent strength and creep properties up to high temperatures. Due to its balanced chemical composition the alloy shows outstanding resistance to high temperature corrosion in the form of oxidation and carburization. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: Ni-480. Producer or source: VDM Technologies Corporation.

BÖHLER W403 VMR

Alloy Digest ◽  
2013 ◽  
Vol 62 (9) ◽  
Keyword(s):  
Heat Treatment ◽  
Chemical Composition ◽  
Physical Properties ◽  
Tool Steel ◽  
Raw Materials ◽  
Heat Treating ◽  
Diffusion Annealing ◽  
Selection Of

Abstract Böhler (or Boehler) W403 VMR is a tool steel with outstanding properties, based not only on a modified chemical composition, but on the selection of highly clean raw materials for melting, remelting under vacuum (VMF), optimized diffusion annealing, and a special heat treatment. This datasheet provides information on composition, physical properties, and elasticity. It also includes information on forming and heat treating. Filing Code: TS-721. Producer or source: Böhler Edelstahl GmbH.

"Recent Patents on the Triboelectrostatic Separation of Fly Ash"

2019 ◽  
Vol 13 ◽  
Author(s):  
Haisheng Li ◽  
Wenping Wang ◽  
Yinghua Chen ◽  
Xinxi Zhang ◽  
Chaoyong Li
Keyword(s):  
Fly Ash ◽  
Power Plants ◽  
High Efficiency ◽  
Separation Efficiency ◽  
High Reliability ◽  
Operating Conditions ◽  
Security Requirements ◽  
Unburned Carbon ◽  
Efficient Operation ◽  
Triboelectrostatic Separation

Background: The fly ash produced by coal-fired power plants is an industrial waste. The environmental pollution problems caused by fly ash have been widely of public environmental concern. As a waste of recoverable resources, it can be used in the field of building materials, agricultural fertilizers, environmental materials, new materials, etc. Unburned carbon content in fly ash has an influence on the performance of resource reuse products. Therefore, it is the key to remove unburned carbon from fly ash. As a physical method, triboelectrostatic separation technology has been widely used because of obvious advantages, such as high-efficiency, simple process, high reliability, without water resources consumption and secondary pollution. Objective: The related patents of fly ash triboelectrostatic separation had been reviewed. The structural characteristics and working principle of these patents are analyzed in detail. The results can provide some meaningful references for the improvement of separation efficiency and optimal design. Methods: Based on the comparative analysis for the latest patents related to fly ash triboelectrostatic separation, the future development is presented. Results: The patents focused on the charging efficiency and separation efficiency. Studies show that remarkable improvements have been achieved for the fly ash triboelectrostatic separation. Some patents have been used in industrial production. Conclusion: According to the current technology status, the researches related to process optimization and anti-interference ability will be beneficial to overcome the influence of operating conditions and complex environment, and meet system security requirements. The intelligent control can not only ensure the process continuity and stability, but also realize the efficient operation and management automatically. Meanwhile, the researchers should pay more attention to the resource utilization of fly ash processed by triboelectrostatic separation.

scholarly journals Investigation of Dye Removal Capability of Blast Furnace Slag in Wastewater Treatment

2021 ◽  
Vol 13 (4) ◽  
pp. 1970
Author(s):  
Sara Yasipourtehrani ◽  
Vladimir Strezov ◽  
Tao Kan ◽  
Tim Evans
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Industrial Wastewater ◽  
Dye Removal ◽  
Treatment Time ◽  
Activated Carbons ◽  
Industrial Applications ◽  
Ore Processing ◽  
Pre Treatment ◽  
Furnace Slag

Blast Furnace Slag (BFS) is a by-product of the iron ore processing industry with potential to be used in different industrial applications. In this research, BFS was used to examine its ability for dye removal from wastewater. The efficiency of two types of BFS samples for removal of cationic methylene blue (MB) and acidic methyl orange (MO) dyes was investigated and results found that the optimal conditions for treatment of wastewater were 80 g/L of adsorbent dose and 1 h of treatment time for both dyes. BFS was found to be more effective for removal of the acidic MO dye than the cationic MB dye. Under shorter residence times, the results showed reverse trends with BFS samples removing higher concentrations of MB than MO. The BFS chemistry had additional impacts on the efficiency of dye removal. Higher basicity of BFS had lower dye removal ability for adsorption of acidic dye when applied at smaller concentrations, while for cationic dye when applied at higher concentrations. The results showed that BFS has potential role for pre-treatment of industrial wastewater contaminated with dyes and may contribute to reduced use of more expensive adsorbents, such as activated carbons.

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