scholarly journals Kinetic analysis of endothermic degradation of magnesium hydroxide, calcium hydroxide and calcium carbonate in the context of passive fire protection

2014 ◽  
Vol 39 (1) ◽  
pp. 14-25 ◽  
Author(s):  
Aleix Ciudad ◽  
Laia Haurie ◽  
A. M. Lacasta
Keyword(s):  
Calcium Carbonate ◽  
Kinetic Analysis ◽  
Calcium Hydroxide ◽  
Magnesium Hydroxide ◽  
Fire Protection ◽  
Passive Fire Protection

Study of Carbonizing Processes for Sintered Dolomite

2007 ◽  
Vol 336-338 ◽  
pp. 2552-2555 ◽  
Author(s):  
Jing Hua Xue ◽  
Min Fang Han ◽  
Qing Yun Wang
Keyword(s):  
Calcium Carbonate ◽  
Calcium Hydroxide ◽  
Magnesium Hydroxide ◽  
Room Temperature ◽  
Xrd Analysis ◽  
Magnesium Carbonate ◽  
Crystal Phase ◽  
Carbonization Process

It is the easy and widely used way to make light calcium carbonate and magnesium carbonate from dolomite by carbonizing process. During this process, the dolomite is calcined at different temperature, from 700°C to 950°C to get the mixture including either calcium carbonate and magnesia or calcia and magnesia. Then the mixture is blended with water in different temperature from room temperature to 80°C. As a result, it is supposed to get calcium hydroxide and magnesium hydroxide, but XRD analysis reveals that it is not accord with the theory. Magnesium hydroxide can not be obtained during this reaction. After the carbonization process, the calcium carbonate and a kind of mixture which is composed with different crystal phase of Mg5(CO3)4(OH)2[H2O]4 have been produced, instead of magnesium carbonate. The magnesia is gotten when the mixture is calcined at 450~750°C.

Thermal study of low-grade magnesium hydroxide used as fire retardant and in passive fire protection

2011 ◽  
Vol 515 (1-2) ◽  
pp. 43-50 ◽  
Author(s):  
J. Formosa ◽  
J.M. Chimenos ◽  
A.M. Lacasta ◽  
L. Haurie
Keyword(s):  
Magnesium Hydroxide ◽  
Fire Protection ◽  
Fire Retardant ◽  
Thermal Study ◽  
Low Grade ◽  
Passive Fire Protection

Study of Interior Materials as Passive Fire Protection in Karaoke Building (Case Study: Masterpiece Signature Family KTV Medan)

2020 ◽  
Vol 4 (1) ◽  
pp. 30-43
Author(s):  
Saras Ayu Faradita ◽  
Vinky Rahman
Keyword(s):  
Fire Protection ◽  
Analytical Hierarchy Process ◽  
Passive Protection ◽  
Fire Incident ◽  
Fire Disaster ◽  
Passive Fire Protection ◽  
Protection Systems ◽  
Hierarchy Process ◽  
The City

The fire incident in karaoke buildings in Indonesia which claimed many lives has occurred several times. According to the National Academy of Science US, the smoke toxins that come out of the fire disaster cause 50-80% of deaths. Refers to the data, it is necessary to check further about the building material response to fire during a fire incident. Masterpiece Signature Karaoke is a karaoke building that classified as large and magnificent in the city of Medan which has various material so that it is necessary to study the interior material as passive fire protection. The purpose is to find out how to assess the reliability of fire passive protection regard to the interior materials and recommendations or descriptions of right interior material planning using the Analytical Hierarchy Process (AHP). This method is efficacious to solve the problem of reliability in using interior materials as passive fire protection in Masterpiece Signature Family KTV Medan building with the results of an Adequate Level of reliability. Then, design recommendations were given for the use of interior materials in karaoke building to improve the reliability results to be better.The results are useful as information for other researchers and karaoke buildings regarding passive fire protection systems at the Masterpiece Signature Family KTV Medan.

Controlled preparation of micro–nano hierarchical hollow calcium carbonate microspheres by pressurized-CO2 carbonization and their CaCO3:Eu3+ photoluminescence properties

CrystEngComm ◽  
2021 ◽  
Vol 23 (16) ◽  
pp. 3033-3042
Author(s):  
Liubin Shi ◽  
Mingde Tang ◽  
Yaseen Muhammad ◽  
Yong Tang ◽  
Lulu He ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Calcium Carbonate ◽  
Calcium Hydroxide ◽  
Hierarchical Structure ◽  
Ethylenediaminetetraacetic Acid ◽  
Disodium Salt ◽  
Hollow Microspheres ◽  
Photoluminescence Properties ◽  
Controlled Preparation

Herein, calcium carbonate hollow microspheres with a micro–nano hierarchical structure were successfully synthesized using disodium salt of ethylenediaminetetraacetic acid (EDTA-2Na) as an additive, by bubbling pressurized carbon dioxide and calcium hydroxide at 120 °C.

PREPARATION OF PRECIPITATED CALCIUMCARBONATE USING ADDITIVE AND WITHOUT ADDITIVE

2015 ◽  
Vol 77 (3) ◽  
Author(s):  
Anuar Othman ◽  
Nasharuddin Isa ◽  
Rohaya Othman
Keyword(s):  
Calcium Carbonate ◽  
Calcium Hydroxide ◽  
Mineral Composition ◽  
Hydrated Lime ◽  
Raw Material ◽  
Precipitated Calcium Carbonate ◽  
Uniform Size ◽  
The One

Precipitated calcium carbonate (PCC) chemically can be synthesized in the laboratory. In this study, hydrated lime or calcium hydroxide was used as raw material with sucrose as additive to produce PCC. The process was compared with the one without additive. PCC produced was observed based on morphology, mineral composition and size by using Fesem-Edx and LPSA, respectively. PCC products without additive demonstrated fine and more uniform size of calcite PCC as compared to the one with additive. Nevertheless, the process with additive produced more PCC product than without additive.

scholarly journals Comparative Efficacy of Montmorillonite, Calcium Hydroxide, Calcium Carbonate in pH Restoration of Acidified Freshwater Bodies

2020 ◽  
Author(s):  
Om Kolhe ◽  
Aidan Moy
Keyword(s):  
Calcium Carbonate ◽  
Acid Rain ◽  
Calcium Hydroxide ◽  
Alternative Methods ◽  
Comparative Efficacy ◽  
Ph Change ◽  
Ecological Consequences ◽  
Freshwater Bodies ◽  
Freshwater Acidification

Freshwater acidification is the result of acid rain precipitating over a freshwater body. There are significant ecological consequences that result from such precipitation, as ecosystems surrounding freshwater bodies are destroyed because many of the organisms in these ecosystems cannot tolerate the pH change caused by acid rain. Current solutions involve a technique known as liming, where powdered calcium carbonate is added to freshwater bodies creating a buffer that helps neutralize the acidity caused by acid rain. However, scientists have been searching for alternative methods to combat the decrease in pH caused by freshwater acidification, by using substitute compounds. In this experiment, we test the efficacy of alternate solutions involving montmorillonite and calcium hydroxide when compared to the currently employed method of using calcium carbonate to combat acidification.

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