CO2 Rebinding by Oil Shale CFBC Ashes: Effect of Pre-Treatment

Abstract The alkaline wastes such as burnt oil shale (BOS) and cement bypass dust (BPD) generally contain free lime and portlandite which make them suitable sorbent materials for CO2 trapping via mineral carbonation technique of carbon capture and sequestration. In order to study the reaction kinetics and effect of operating parameters on carbonation processes of such alkaline wastes for future industrial sized scale-ups, as well as to identify the effects on carbonation capacity when these sorbents undergo pre-treatment and are exposed to different temperatures, BOS and BPD as sorbents in CO2 mineralization process have been investigated with thermal analysis methods in the current work. Results indicate that selected types of BOS and BPD could be used as binders in the CO2 mineralization systems, binding reasonably good amount of CO2 already in the early stage of the carbonation process which later slows down as the rate of CaO carbonation becomes mainly diffusion controlled. Increased process temperature and hydration as pre-treatment improve the CO2 binding ability, while the effect of milling has been found to be staggering and not as significant as the effect of hydration and temperature rise. The appropriate kinetic mechanism functions were determined, and the kinetic parameters—activation energy (Ea) and pre-exponential factor (A) values were calculated for all the samples. The Ea values of hydrated samples are lower for BOS samples compared to non-hydrated samples. It was shown that activation by hydration enables to reach the same CO2 uptake levels at lower temperatures, thereby making the mineralization process more energy efficient and thus lowering the costs.

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Correction to: CO2 mineralization by burnt oil shale and cement bypass dust: effect of operating temperature and pre-treatment

Journal of Thermal Analysis and Calorimetry ◽

10.1007/s10973-020-09973-5 ◽

2020 ◽

Vol 142 (2) ◽

pp. 1001-1001

Author(s):

Can Rüstü Yörük ◽

Mai Uibu ◽

Mustafa Cem Usta ◽

Tiit Kaljuvee ◽

Andres Trikkel

Keyword(s):

Oil Shale ◽

Operating Temperature ◽

Dust Effect ◽

Pre Treatment ◽

Co2 Mineralization

The article CO2 mineralization by burnt oil shale and cement bypass dust: effect of operating temperature and pre-treatment, written by Can Rüstü Yörük, Mai Uibu, Mustafa Cem Usta, Tiit Kaljuvee, Andres Trikkel.

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Landfill plastic to liquid oil

Linnaeus Eco-Tech ◽

10.15626/eco-tech.2014.063 ◽

2017 ◽

Author(s):

Dmitri Suštšik ◽

Hella Riisalu ◽

Rein Muoni ◽

Mait Kriipsalu

Keyword(s):

Heat Recovery ◽

Liquid Fuel ◽

Oil Shale ◽

Plastic Waste ◽

Cement Industry ◽

University Of Technology ◽

Series Of Experiments ◽

Pre Treatment ◽

Oil Gas ◽

Made In

A full-scale Landfill Mining (LFM) project was made in 2012–2013 in Estonia at Kudjape Landfill. As a result of mining, mixed plastic waste was separated from excavated material. After sieving and shredding the received plastic fraction was washed and dried for further research. The waste plastic may be incinerated for energy and heat recovery or used as solid recovered fuel in cement industry. However, more favoured could be reprocessing this material to liquid fuel. A series of experiments were made to study pyrolysis of landfill plastic after being buried for up to ten years. Mixed plastic was treated thermally by semi-coking process as used by thermal treatment of oil shale in Estonia. The preliminary studies have shown, that oil, gas and solid carbon-rich residue may be received. All of these products show value as energy source. In this project, interdisciplinary research was done by Estonian University of Life Sciences (responsible for mining, sorting, pre-treatment and washing of landfill plastic), and Tallinn University of Technology (responsible for semi-coking of plastic waste and analyses of end-products). Results, conclusions, and proposals are presented in the article.

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EELS characterization of “Smut” layer films on steel surface prepared for chrome plating by anodic etching

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100139068 ◽

1995 ◽

Vol 53 ◽

pp. 538-539

Author(s):

E Y. Wang ◽

J. T. Cherian ◽

A. Madsen ◽

R. M. Fisher

Keyword(s):

Steel Surface ◽

Surface Preparation ◽

Treatment Method ◽

Chrome Plating ◽

Transmission Electron ◽

Alloy Steels ◽

Pre Treatment ◽

Hard Chrome ◽

Electron Energy Loss

Many steel parts are electro-plated with chromium to protect them against corrosion and to improve their wear-resistance. Good adhesion of the chrome plate to the steel surface, which is essential for long term durability of the part, is extremely dependent on surface preparation prior to plating. Recently, McDonnell Douglas developed a new pre-treatment method for chrome plating in which the steel is anodically etched in a sulfuric acid and hydrofluoric acid solution. On carbon steel surfaces, this anodic pre-treatment produces a dark, loosely adhering material that is commonly called the “smut” layer. On stainless steels and nickel alloys, the surface is only darkened by the anodic pre-treatment and little residue is produced. Anodic pre-treatment prior to hard chrome plating results in much better adherence to both carbon and alloy steels.We have characterized the anodic pre-treated steel surface and the resulting “smut” layer using various techniques including electron spectroscopy for chemical analysis (ESCA) on bulk samples and transmission electron microscopy (TEM) and electron energy-loss spectroscopy (EELS) on stripped films.

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