scholarly journals Comparison of the Properties of Natural Sorbents for the Calcium Looping Process

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 548
Author(s):  
Krzysztof Labus
Keyword(s):  
Calcium Carbonate ◽  
Conversion Rate ◽  
Carbonate Rocks ◽  
Global Temperature ◽  
Industrial Processes ◽  
Thermal Pretreatment ◽  
Dsc Analysis ◽  
Natural Sorbents ◽  
Calcium Looping

Capturing CO2 from industrial processes may be one of the main ways to control global temperature increases. One of the proposed methods is the calcium looping technology (CaL). The aim of this research was to assess the sequestration capacity of selected carbonate rocks, serpentinite, and basalt using a TGA-DSC analysis, thus simulating the CaL process. The highest degrees of conversion were obtained for limestones, lower degrees were obtained for magnesite and serpentinite, and the lowest were obtained for basalt. The decrease in the conversion rate, along with the subsequent CaL cycles, was most intense for the sorbents with the highest values. Thermally pretreated limestone samples demonstrated different degrees of conversion, which were the highest for the calcium-carbonate-rich limestones. The cumulative carbonation of the pretreated samples was more than twice as low as that of the raw ones. The thermal pretreatment was effective for the examined rocks.

scholarly journals Unconventionally Made-Cellular Glass Aggregate

2021 ◽  
Vol 2 (6) ◽  
pp. 21-31
Author(s):  
Lucian Paunescu ◽  
Sorin Mircea Axinte ◽  
Felicia Cosmulescu
Keyword(s):  
Calcium Carbonate ◽  
Sodium Silicate ◽  
Electromagnetic Waves ◽  
Microwave Field ◽  
Industrial Processes ◽  
Sodium Borate ◽  
Residual Glass ◽  
Cellular Glass ◽  
Glass Aggregate ◽  
Fluxing Agent

Improving the original manufacturing process in microwave field of a cellular glass aggregate using a recipe containing colored consumed drinking bottle, calcium carbonate (CaCO3) as an expanding agent, sodium borate (borax) as a fluxing agent and sodium silicate (Na2SiO3) as a binder is shown in the work. The main adopted technological measures were the advanced mechanical processing of residual glass at a grain dimension below 100 μm and especially the use of a high electromagnetic wave susceptible ceramic tube with a wall thickness reduced from 3.5 to 2.5 mm for the protection of the pressed glass-based mixture against the aggressive effect of microwave field and, in the same time, to achieve a preponderantly direct heating with electromagnetic waves. Of the tested variants, a recipe with 1.6 % calcium carbonate, 6 % borax, 8 % sodium silicate and the rest residual glass was determined to be optimal. The cellular glass aggregate had the bulk density of 0.22 g/cm3, heat conductivity of 0.079 W/m·K and compression strength of 5.9 MPa. The specific consumption of energy was very low (0.71 kWh/kg) below the range of reported values of the industrial processes consumption (between 0.74-1.15 kWh/kg).  

scholarly journals MICROWAVE MANUFACTURE OF GLASS FOAM BY COMBINED USE OF GRAPHITE AND CALCIUM CARBONATE AS FOAMING AGENTS

2021 ◽  
Vol 27 (1) ◽  
pp. 110-119
Author(s):  
LUCIAN PAUNESCU ◽  
SORIN MIRCEA AXINTE ◽  
MARIUS FLORIN DRAGOESCU ◽  
BOGDAN VALENTIN PAUNESCU ◽  
FELICIA COSMULESCU
Keyword(s):  
Calcium Carbonate ◽  
High Strength ◽  
Industrial Processes ◽  
Glass Waste ◽  
Foaming Agents ◽  
Combined Use ◽  
Variable Weight ◽  
Low Energy Consumption ◽  
Experimental Variant ◽  
Glass Foam

The paper presents experimental results obtained in the manufacturing process of high-strength glass foam by combined use of two solid foaming agents (calcium carbonate and graphite) in variable weight ratios. The originality of the work is applying the unconventional microwave heating method, unlike the conventional techniques currently used in similar industrial processes. The optimal experimental variant, composed of 89.1 % glass waste, 0.9% calcium carbonate, 1 % graphite and other additives, was sintered at 828 ºC with a very low energy consumption (0.73 kWh/kg). The main characteristics of the optimal product were apparent density of 0.39 g/cm3, thermal conductivity of 0.088 W/m·K and compressive strength of 3.6 MPa, being usable in fields that requires resistance to mechanical stress and relatively difficult environmental conditions.

Performance of Natural Sorbents during Calcium Looping Cycles: A Comparison between Fluidized Bed and Thermo-Gravimetric Tests

2013 ◽  
Vol 27 (10) ◽  
pp. 6048-6054 ◽  
Author(s):  
Antonio Coppola ◽  
Fabrizio Scala ◽  
Grigorios Itskos ◽  
Panagiotis Grammelis ◽  
Halina Pawlak-Kruczek ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Thermo Gravimetric ◽  
Natural Sorbents ◽  
Calcium Looping

scholarly journals Effect of Thermal Pretreatment and Nanosilica Addition on Limestone Performance at Calcium-Looping Conditions for Thermochemical Energy Storage of Concentrated Solar Power

2017 ◽  
Vol 31 (4) ◽  
pp. 4226-4236 ◽  
Author(s):  
Jose Manuel Valverde ◽  
Manuel Barea-López ◽  
Antonio Perejón ◽  
Pedro E. Sánchez-Jiménez ◽  
Luis A. Pérez-Maqueda
Keyword(s):  
Energy Storage ◽  
Solar Power ◽  
Thermal Pretreatment ◽  
Concentrated Solar Power ◽  
Calcium Looping

Determination of barium in calcium carbonate rocks by carbon furnace atomic-emission spectrometry

The Analyst ◽  
1977 ◽  
Vol 102 (1215) ◽  
pp. 429 ◽  
Author(s):  
R. C. Hutton ◽  
J. M. Ottaway ◽  
T. C. Rains ◽  
M. S. Epstein
Keyword(s):  
Calcium Carbonate ◽  
Carbonate Rocks ◽  
Atomic Emission ◽  
Atomic Emission Spectrometry ◽  
Emission Spectrometry

scholarly journals A hydrated crystalline calcium carbonate phase: Calcium carbonate hemihydrate

Science ◽  
2019 ◽  
Vol 363 (6425) ◽  
pp. 396-400 ◽  
Author(s):  
Zhaoyong Zou ◽  
Wouter J. E. M. Habraken ◽  
Galina Matveeva ◽  
Anders C. S. Jensen ◽  
Luca Bertinetti ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Cement Industry ◽  
Industrial Processes ◽  
Magnesium Ions ◽  
Monoclinic Structure ◽  
Ambient Conditions ◽  
Amorphous Calcium Carbonate ◽  
Hydrated Crystal ◽  
Global Carbon

As one of the most abundant materials in the world, calcium carbonate, CaCO3, is the main constituent of the skeletons and shells of various marine organisms. It is used in the cement industry and plays a crucial role in the global carbon cycle and formation of sedimentary rocks. For more than a century, only three polymorphs of pure CaCO3—calcite, aragonite, and vaterite—were known to exist at ambient conditions, as well as two hydrated crystal phases, monohydrocalcite (CaCO3·1H2O) and ikaite (CaCO3·6H2O). While investigating the role of magnesium ions in crystallization pathways of amorphous calcium carbonate, we unexpectedly discovered an unknown crystalline phase, hemihydrate CaCO3·½H2O, with monoclinic structure. This discovery may have important implications in biomineralization, geology, and industrial processes based on hydration of CaCO3.

Preparation of Calcium Sulfate from Oil-Refining Acid Sludge by Neutralization Method

2013 ◽  
Vol 726-731 ◽  
pp. 2553-2557
Author(s):  
Li Jun Nie ◽  
Shi Kui Wu ◽  
Yang Liu Liu
Keyword(s):  
Calcium Carbonate ◽  
Conversion Rate ◽  
Calcium Sulfate ◽  
Quality Standards ◽  
Oil Refining ◽  
Dilution Factor ◽  
Lubricant Oil ◽  
National Quality ◽  
Acid Sludge ◽  
Addition Amount

For the purpose of recycling acid sludge of lubricant oil from refinery, on the conditions that the dilution factor is 20 and the actual addition amount of calcium carbonate and calcium hydroxide is respectively 1.15 and 1.1 times of the theoretical value, neutralization method is used to process acid sludge. By means of removing post-reaction organic phase, evaporating, drying, igniting at 650°C for 80 min, dissolving, crystallizing, calcium sulfate product is obtained. The conversion rate of SO42- in acid sludge is more than 75% in the product. The purified product meets the national quality standards for similar products.

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