Preparation of sintered foam materials by alkali-activated coal fly ash

2010 ◽  
Vol 174 (1-3) ◽  
pp. 108-112 ◽  
Author(s):  
Yelong Zhao ◽  
Junwei Ye ◽  
Xiaobin Lu ◽  
Mangang Liu ◽  
Yuan Lin ◽  
...  
Keyword(s):  
Fly Ash ◽  
Coal Fly Ash ◽  
Activated Coal ◽  
Alkali Activated

scholarly journals Microstructural and Mineralogical Properties of Acid and Alkali Activated Coal Fly Ash

2019 ◽  
Vol 5 (1) ◽  
pp. 612-614 ◽  
Author(s):  
Bijoy Kumar Mondal ◽  
Md. Nurul Islam ◽  
Md. Emdad Hossain ◽  
Md. Nurul Abser
Keyword(s):  
Fly Ash ◽  
Coal Fly Ash ◽  
Mineralogical Properties ◽  
Activated Coal ◽  
Alkali Activated

Adsorption of Pb(II) from Aqueous Solutions on Dithizone-Immobilized Coal Fly Ash

2020 ◽  
Vol 840 ◽  
pp. 57-63
Author(s):  
Dina Fitriana ◽  
Mudasir Mudasir ◽  
Dwi Siswanta
Keyword(s):  
Fly Ash ◽  
Adsorption Isotherm ◽  
Contact Time ◽  
Coal Fly Ash ◽  
Order Kinetic ◽  
Adsorbent Dosage ◽  
Activated Coal ◽  
Concentration Of Ions ◽  
Order Kinetic Model ◽  
Pseudo Second Order

Adsorption of Pb(II) ions onto selective adsorbent of dithizone-immobilized coal fly ash (DCFA) from Holcim, Cilacap, Indonesia has been investigated in batch experiments. Prepared coal fly ash (CFA) modified by immobilization of dithizone previously were characterized by FT-IR and XRD. Several parameters influencing the adsorption of Pb(II) ions such as effect of pH, adsorbent dosage, contact time and initial concentration of ions on the efficiency of the adsorption were studied. The optimum condition of Pb(II) adsorption was found at pH 5, adsorbent dosage 0.1 g, contact time 60 min and initial Pb(II) ions concentration of 60 mg L–1. The adsorption kinetics of Pb(II) ions on DCFA was found to follow a pseudo-second-order kinetic model. The adsorption isotherm data were fitted to the Langmuir model. Kinetics and adsorption isotherm studies suggest that the capacity and affinity of the DCFA in adsorbing Pb(II) ions is significantly improved compared to those of non-immobilized activated coal fly ash (ACFA).

Possibilities of Using Alternative Materials as a Substitute Binder or Filler into Composites

2015 ◽  
Vol 1105 ◽  
pp. 31-35 ◽  
Author(s):  
Nadežda Števulová ◽  
Ivana Schwarzova ◽  
Viola Hospodarova ◽  
Jozef Junak ◽  
Marcela Ondova ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Coal Fly Ash ◽  
Steel Slag ◽  
Recycled Concrete ◽  
Partial Replacement ◽  
Alternative Materials ◽  
Activated Coal ◽  
Hemp Fibres ◽  
Lightweight Composites

This article reports on the possibilities of using selected alternative materials like hemp fibres, MgO-cement, recycled concrete, fly ash and steel slag as binder or filler replacement in composite materials in civil engineering production. These binder or filler substitutes were mixed into composites and their compressive strength was tested. The paper is divided into four parts providing the results of experiments. In first part strength parameters of lightweight composites based on natural fibres (hemp hurds) and alternative binder (MgO-cement) are presented. Compressive strength values of concrete samples with partial replacement of cement with mechanochemically activated coal fly ash are given. The third and forth part is aimed to utilization of recycled concrete and steel slag as a natural aggregate replacement in concrete mixture for purpose of structural concrete and surface roads.

scholarly journals Catalytic Transesterification of Used Cooking Oil to Biodiesel: Effect of Oil-Methanol Molar Ratio and Reaction Time

2019 ◽  
Vol 2 (3) ◽  
pp. 73-77 ◽  
Author(s):  
Diah Ayu ◽  
Rizca Aulyana ◽  
Esti Widya Astuti ◽  
Kusmiyati Kusmiyati ◽  
Nur Hidayati
Keyword(s):  
Fly Ash ◽  
Catalyst Surface ◽  
Coal Fly Ash ◽  
Methyl Esters ◽  
National Standard ◽  
Molar Ratio ◽  
Cooking Oil ◽  
Used Cooking Oil ◽  
Alkali Activated ◽  
Catalyst Load

Used cooking oil has the potential as biodiesel so that it can reduce environmental pollution. Transesterification of triglycerides in used cooking oil with an alcohol to form methyl esters of fatty acids or biodiesel and glycerol. The type of catalyst is one of the determinants of the transesterification reaction and coal fly ash has the potential to be used as a catalyst in the production of biodiesel. Therefore, this study aims to examine the effect of the oil-methanol ratio and the time of the transesterification of used cooking oil to the yield of biodiesel produced using an alkali-activated fly ash catalyst. Transesterification is carried out at 60 °C, the stirring speed is 700 rpm, and the amount of catalyst load is 4%. The result, the highest yield of biodiesel reached almost 89%. This biodiesel consists of 48.86% methyl oleate and 33.86% methyl palmitate and has a density that meets the Indonesian National Standard, which is 0.85 - 0.90 g/cm3. Finally, the BET test on the fly ash catalyst shows a catalyst surface area of ​​around 104.106 m2/g.

A novel nickel catalyst supported on activated coal fly ash for syngas production via biogas dry reforming

2020 ◽  
Vol 149 ◽  
pp. 786-793 ◽  
Author(s):  
Yuchen Gao ◽  
Jianguo Jiang ◽  
Yuan Meng ◽  
Aikelaimu Aihemaiti ◽  
Tongyao Ju ◽  
...  
Keyword(s):  
Fly Ash ◽  
Nickel Catalyst ◽  
Coal Fly Ash ◽  
Dry Reforming ◽  
Syngas Production ◽  
Activated Coal

Material and structural characterization of alkali activated low-calcium brown coal fly ash

2009 ◽  
Vol 168 (2-3) ◽  
pp. 711-720 ◽  
Author(s):  
František Škvára ◽  
Lubomír Kopecký ◽  
Vít Šmilauer ◽  
Zdeněk Bittnar
Keyword(s):  
Fly Ash ◽  
Brown Coal ◽  
Structural Characterization ◽  
Coal Fly Ash ◽  
Low Calcium ◽  
Alkali Activated
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