Adsorption and stabilization of nickel ions on fly ash/lime mixing

2000 ◽  
Vol 42 (5-6) ◽  
pp. 79-85 ◽  
Author(s):  
P. Ricou-Hoeffer ◽  
V. Héquet ◽  
I. Lécuyer ◽  
P. Le Cloirec
Keyword(s):  
Fly Ash ◽  
Coal Fly Ash ◽  
Influential Factors ◽  
Metallic Ions ◽  
Mass Ratio ◽  
Solution Ph ◽  
Nickel Ions ◽  
Experimental Design Methodology ◽  
By Products ◽  
Lime Addition

Experimental design methodology was used to define conditions for the adsorption and the stabilization of nickel ions (initial concentration of 500 mg.L-1) on coal fly ash/lime sorbent. This type of sorbent allows the reuse of by-products and increases the stabilization of metallic ions by lime addition. It was shown that the solution pH, the metal/adsorbent mass ratio, the type of fly ash used as sorbent, and the fly ash/lime mass ratio are the most influential factors. A set of parameters was finally obtained (pH 5, metal/adsorbent ratio of 0.01 g.g-1, fly ash/lime ratio of 4 g.g-1, fly ash with the lowest content of iron oxide) for which the removal of Ni2+ is 96% and the leaching 0.03% by permuted water and 0.2% by acid solution of pH 2.

Pore structure evaluation of cementing composites blended with coal by-products: Calcined coal gangue and coal fly ash

2018 ◽  
Vol 181 ◽  
pp. 75-90 ◽  
Author(s):  
Jin Yang ◽  
Ying Su ◽  
Xingyang He ◽  
Hongbo Tan ◽  
Youzhi Jiang ◽  
...  
Keyword(s):  
Fly Ash ◽  
Pore Structure ◽  
Coal Fly Ash ◽  
Coal Gangue ◽  
Structure Evaluation ◽  
By Products

scholarly journals Modified coal fly ash as low cost adsorbent for removal reactive dyes from batik industry

2018 ◽  
Vol 154 ◽  
pp. 01037 ◽  
Author(s):  
Agus Taufiq ◽  
Pratikno Hidayat ◽  
Arif Hidayat
Keyword(s):  
Fly Ash ◽  
Low Cost ◽  
Coal Fly Ash ◽  
Reactive Dyes ◽  
Bet Surface Area ◽  
Batch Adsorption ◽  
Operational Parameters ◽  
Solution Ph ◽  
Percentage Removal ◽  
Modified Fly Ash

The removal of reactive dyes on modified coal fly ash has been investigated during a series of batch adsorption experiments. Physical characteristics of modified coal fly ash was characterized by Brunauer Emmett Teller (BET) surface area analysis, X-ray powder diffraction (XRD), Fourier transform infrared spectrophotometer (FT-IR), and scanning electron microscope (SEM). The effects of operational parameters such as initial dye concentration (50–200 mg/L), solution pH (4–10) and adsorbent dosage (50–200 mg/L) were studied. The adsorption experiments indicated that modified coal fly ash was effective in removing of Remazol Blue. The percentage removal of dyes increased while the modified fly ash dosage increased. The percentage removal of dyes increased with decreased initial concentration of the dye and also increased with amount of adsorbent used. The optimum of removal of dyes was found to be 94% at initial dye concentration 50 g/mL, modified fly ash dosage 250 g/mL, and pH of 2.0.

scholarly journals A Laboratory Scale Synthesis of Geopolymer from Locally Available Coal Fly Ash from Brick Industry

2013 ◽  
Vol 29 ◽  
pp. 18-23
Author(s):  
Rishi Babu Bhandari ◽  
Arvind Pathak ◽  
Vinay Kumar Jha
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Time Variation ◽  
Coal Fly Ash ◽  
Curing Temperature ◽  
Alkali Concentration ◽  
Curing Time ◽  
Mass Ratio ◽  
Maximum Compressive Strength

In this work, geopolymers have been synthesized from coal fly ash (CFA) using KOH and Na2SiO3 as activators. Some parameters such as alkali concentration, amount of Na2SiO3 and curing time have been varied in order to improve the quality of geopolymeric product. The geopolymerization process was carried out using 3-8 M KOH solutions, Na2SiO3 to CFA mass ratio of 0.25-2.00 and curing time variation from 6-28 days. The curing temperature was fixed at 40°C in all the cases. During the variation of KOH concentration, the maximum compressive strength of 6.62 MPa was obtained with CFA treated with 7 M KOH solution. Similarly, with the variation of the mass ratio of Na2SiO3 to CFA, the maximum compressive strength of 28.1 MPa was obtained with Na2SiO3 to CFA mass ratio of 1.75. Furthermore, the compressive strength was found to be increased with increasing curing time and 41.9 MPa was achieved with 28 days of curing time. DOI: http://dx.doi.org/10.3126/jncs.v29i0.9232Journal of Nepal Chemical SocietyVol. 29, 2012Page: 18-23Uploaded date : 12/3/2013 

scholarly journals Study of Extraction of Rare Earth Elements from Hard Coal Fly Ash

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Ingrid ZNAMENÁČKOVÁ ◽  
Silvia DOLINSKÁ ◽  
Slavomír HREDZÁK ◽  
Vladimír ČABLÍK ◽  
Michal LOVÁS ◽  
...  
Keyword(s):  
Grain Size ◽  
Rare Earth ◽  
Fly Ash ◽  
Rare Earth Elements ◽  
Coal Fly Ash ◽  
Size Reduction ◽  
Hard Coal ◽  
Alternative Possibility ◽  
Laboratory Results ◽  
By Products

Rare earth elements (REEs) extraction from wastes and/or by-products is alternative possibility of their winning. The occurrence ofREEs, namely 50.1 ppm of La, 100.1 ppm of Ce and 44.3 ppm of Nd was confirmed in solid fly ash samples from the coal fired heatingplant (TEKO, Inc. Košice, eastern Slovakia). The submitted contribution presents laboratory results of REEs leaching from coal fly ashusing 3M HCl, HNO3, H2SO4 and H3PO4 at 80°C during 120 min.It was found, that recoveries 65.5% of La, 64.4% Ce and 64.3% of Nd into liquor may be attained after grain size reduction to below5 μm.

Preparation of α-Alumina from Coal Fly Ash by Sintering with Sulfuric Acid

2010 ◽  
Vol 113-116 ◽  
pp. 2039-2044 ◽  
Author(s):  
Wen Ning Mu ◽  
Yu Chun Zhai
Keyword(s):  
Sulfuric Acid ◽  
Fly Ash ◽  
Coal Fly Ash ◽  
Acid Leaching ◽  
National Standards ◽  
Sintering Process ◽  
Optimal Parameters ◽  
Mass Ratio ◽  
Sulfuric Acid Leaching ◽  
Sintering Time

A technology was studied to prepare -alumina from fly ash, and the integrated process flow including sintering with sulfuric acid, leaching, recrystallization, calcination was established in this paper. The influences including the particle size of fly ash, sintering temperature, sintering time and the mass ratio of sulfuric acid to fly ash on the extraction ratio of alumina were investigated and discussed during sintering process, and the optimal parameters were determined. The product of -alumina was examined by chemical analysis, XRD and SEM, and the results show that α-alumina reach the national standards.

scholarly journals Processing of high-grade zeolite nanocomposites from solid fuel combustion by-products as critical raw materials substitutes

2020 ◽  
Vol 7 ◽  
pp. 22
Author(s):  
Silviya Boycheva ◽  
Denitza Zgureva ◽  
Hristina Lazarova ◽  
Katerina Lazarova ◽  
Cyril Popov ◽  
...  
Keyword(s):  
Fly Ash ◽  
Power Plants ◽  
Raw Materials ◽  
Coal Fly Ash ◽  
Thermal Power ◽  
Coal Ash ◽  
High Grade ◽  
Fly Ash Zeolite ◽  
By Products ◽  
Critical Raw Materials

High-grade zeolite nanocomposites are synthesized utilizing solid by-products from combustion of coal for energy production in Thermal Power Plants applying alkaline aging, hydrothermal and fusion-hydrothermal activation procedures. The obtained coal ash zeolites were studied with respect to their chemical and phase composition, morphology, surface parameters and thermal properties. It was found that they are distinguished in nanocrystalline morphology and significant content of iron oxide nanoparticles (γ-Fe2O3, α-Fe2O3, γ-Fe3O4) and doping elements (Cu, Co, Mn, V, W, etc.) transferred from the raw coal ash, and therefore they are assumed as nanocomposites. Coal fly ash zeolite nanocomposites are characterized by a mixed micro-mesoporous texture, significant concentration of acidic Brønsted centers due to their high surface insaturation, high chemical and thermal stabilty. This unique combination of compositional and textural properties predetermines the application of these materials as catalysts for thermal oxidation processes, anticorrosion barrier coatings, carbon capture adsorbents, matrices for hosting functional groups, detergents etc. Examples for coal fly ash zeolite applications for substitution of critical raw materials in practice are provided.

Coal fly ash and lime addition enhances the rate and efficiency of decomposition of food waste during composting

2009 ◽  
Vol 100 (13) ◽  
pp. 3324-3331 ◽  
Author(s):  
Jonathan W.-C. Wong ◽  
Shun On Fung ◽  
Ammaiyappan Selvam
Keyword(s):  
Fly Ash ◽  
Food Waste ◽  
Coal Fly Ash ◽  
Lime Addition

scholarly journals Equilibrium isotherm studies for the sorption of Nickel ions onto coal fly ash

2014 ◽  
Vol 15 (1&2) ◽  
pp. 153-159
Author(s):  
Ajay K. Agarwal ◽  
Mahendra S. Kadu ◽  
Chandrashekhar P. Pandhurnekar ◽  
Ishwardas L. Muthreja
Keyword(s):  
Fly Ash ◽  
Adsorption Isotherm ◽  
Coal Fly Ash ◽  
Coefficient Of Determination ◽  
Equilibrium Isotherm ◽  
Chi Square ◽  
Linear Coefficient ◽  
Nickel Ions ◽  
Chi Square Test ◽  
Best Fit

The objective of the present study was to study equilibrium isotherm for the sorption of Nickel ions onto coal fly ash. In this study, BET adsorption isotherm was found to be best fitted among  Langmuir, Freundlich, BET, Temkin and Harkins Jura adsorption isotherms using lest square fit method. The best fit adsorption isotherm   is assessed by the linear coefficient of determination (R2) and non-linear Chi-square test. The theoretical value of qe calculated from the best fit linear equation of each adsorption isotherm and the experimental values of qe (0.08) are plotted against Ce, to compare the experimental and Theoretical value of qe.

Sign in / Sign up

Export Citation Format

Share Document