Results 211 to 220 of about 30,482 (257)

Optimum lime content of fly ash with salt

Proceedings of the Institution of Civil Engineers - Ground Improvement, 2003
The pozzolanic reactivity of fly ash, which plays an important role in its utilisation for geotechnical applications, depends on the reactive silica and the lime content. Fly ashes containing sufficient reactive silica but insufficient lime content improve strength on the addition of lime.
Narendra, B.S., Sivapullaiah, P.V., Ramesh, H.N.   +2 more
openaire   +2 more sources

Modeling of Salt Sorption in Volcanic Ash Soil

Communications in Soil Science and Plant Analysis, 2017
Groundwater pollution by nitrate from agricultural fields is a worldwide problem. To improve the understanding of nitrate transport processes through volcanic ash soils overlying groundwater aquifers, salt sorption experiments were performed. Salt sorption is the process that involves the simultaneous use of cation and anion adsorption mechanisms ...
Kei Nakagawa, Shin-Ichiro Wada, Ryoma Kitamura, Ronny Berndtsson   +3 more
openaire   +1 more source

Improvement of strength of fly ash with lime and sodium salts

Proceedings of the Institution of Civil Engineers - Ground Improvement, 1999
It is often necessary to improve the strength of fly ash to enable its use for many geotechnical applications. Lime in some form or other is normally used as an admixture. Methods are established to determine the optimum lime content for fly ash, as the addition of lime beyond the optimum lime content may not be beneficial or economically viable. This
Ramesh, H.N., Mohan, M.S., Sivapullaiah, P.V.   +2 more
openaire   +2 more sources

Salt roasting of suncor oil sands fly ash

Metallurgical and Materials Transactions B, 2004
Fly ash samples from 25 years of Suncor’s oil sands upgrading operations were tested to determine the effects of time, temperature, and salt addition on vanadium recovery by salt roasting and water leaching. The optimum roasting conditions for “carbon-free” ash were determined to be 2 to 3 hours roasting at 850 °C to 900 °C with NaCl additions of 20 to
P. C. Holloway, T. H. Etsell
openaire   +1 more source

Extraction and quantitation of various potassium salts in straw ash

Environmental Progress & Sustainable Energy, 2014
Biomass ash contains various potassium salts, which have high potential as crop fertilizers. In this study, a method of extracting and quantifying various potassium salts from straw ash was proposed and investigated. Straw ash was prepared in a muffle furnace at 500°C and then successively and repeatedly treated through leaching, filtration ...
Yibin Wang, Xuebin Wang, Houzhang Tan, Wenzhi Du, Xiaodi Qu   +4 more
openaire   +1 more source

Carbochlorination of Fly Ash in a Fused Salt Slurry Reactor

MRS Proceedings, 1986
ABSTRACTCarbochlorination of the metal oxides in fly ash by suspending the solid reactants in a NaCl-AlCl3 melt at 530–850°C and then sparging chlorine into the melt has been investigated. A mechanically agitated, semi-batch reactor was used to test the effects of temperature, oxide and carbon loading, salt composition and gas flow on the reaction rate.
M. S. Dobbins, G. Burnet
openaire   +1 more source

Immobilization of by-product sulfate salt slag from high-salt organic wastewater with fly ash in lightweight aggregate ceramsite

Environmental Technology, 2021
The lightweight aggregate ceramsite (LAC) was prepared from by-product sulfate salt slag (BPSS) of high-salt organic wastewater with fly ash. The BPSS fixation rate, leaching toxicity, morphological structures and potential environmental risks of heavy metals in LAC were investigated.
Qian, He, Huixia, Chen, Haiyan, Tang, Jiyuan, Sun, Hongbin, Xu, You, Zhang   +5 more
openaire   +2 more sources

Demineralization of a High Ash Coal in Acidic Salt Solution

2020
The research investigated the reduction of the ash and sulphur contents of the high ash and high sulphur Nigerian Akunsa coal. The coal as received contained 38 and 1.98% of ash and sulphur, respectively. The coal samples were leached using sodium carbonate, nitric acid, and sodium carbonate acidified in nitric acid at varying combinations of ...
A. A. Adeleke, L. O. Jimoh, S. A. Ibitoye   +2 more
openaire   +1 more source

Study on Frost-Salt Resistance of Fly Ash Concrete

Advanced Materials Research, 2012
Accelerated frost-salt tests of fly ash concrete were carried out, through which the influence of water-binder ratio, volume of fly ash, air-entraining content on the frost-salt resistance of concrete were discussed, and the variation of surface characteristics, weight loss rate, relative dynamic modulus of concrete elasticity with the number of freeze-
Cong Tao Sun, Wei Hua Li, Bao Rong Hou
openaire   +1 more source

Alkali Salt Ash Formation in Four Finnish Industrial Recovery Boilers

Energy & Fuels, 1999
Combustion aerosol measurement methods were introduced and applied for extensive ash formation studies at four operating recovery boilers in Finland. Ash particle mass size distributions determined with a Berner-type low-pressure impactor downstream the heat exchangers were clearly bimodal with the fine mode at about 2 µm and the coarse mode above 3 µm
Kauppinen, Esko I., Pyykönen, Jouni, Jokiniemi, Jorma, Aurela, Minna, Vakkilainen, Esa, Janka, Kauko, Mikkanen, Pirita   +7 more
openaire   +3 more sources