Thermal synthesis of sodium calcium carbonate—A potential thermal analysis standard

Abstract A glass set with a high content of blast-furnace slag and a reduced amount of traditional raw materials requires optimization of the raw material composition and adjustment of its specificity to the temperature regime of melting, homogenizing and clarifying the glass mass. The introduction of an increased amount of blast-furnace slag allows to reduce the cost of raw materials: soda, limestone and high-class sand, reduce energy costs, whose consumption significantly decreases and reduces CO2 emissions in line with EU requirements. The tests of thermal analysis of a glass set with different contents of Calumite are aimed at learning the mechanism of its operation by determining the changes caused by its different presence in the course of subsequent reactions between the components of the glass set. Analysis of the influence of the addition of different Calumite slag contents treated as a substitute for the raw material on the melting process of glassware sets was analyzed. The tests were carried out using differential thermal analysis (DTA) and thermogravimetry (TG) based on the model glass [mass%]: 73.0% SiO2, 1.0% Al2O3, 10.0% CaO, 2.0% MgO and 14.0% Na2O. The effect of combining Calumite with sulphate and multi-component fining agent—mixtures of As2O3, Sb2O3, NaNO3 in proportions of 1:1:1 for chemical reaction and phase transformation, was investigated.

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The Carbonation of Calcium-Silicate-Hydrate C-S-H in Cement Mortar Studied Using Thermal Analysis and Gas Pycnometer: Determination of the Quantity of Calcium Carbonate Produced and the Increase in Molar Volume

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.931-932.411 ◽

2014 ◽

Vol 931-932 ◽

pp. 411-415 ◽

Cited By ~ 1

Author(s):

Son Tung Pham ◽

William Prince

Keyword(s):

Thermal Analysis ◽

Calcium Carbonate ◽

Relative Humidity ◽

Molar Volume ◽

Calcium Silicate ◽

Calcium Silicate Hydrate ◽

Cement Mortar ◽

Accelerated Carbonation ◽

Carbonation Of Portlandite

The objective of this work was to examine the microstructural changes caused by the carbonation of normalised cement mortar. Samples were prepared and subjected to accelerated carbonation at 20°C, 65% relative humidity and 20% CO2 concentration. The main contributions of this study were: 1) a new way to determine separately the amount of calcium carbonate CaCO3 produced by the carbonation of portlandite Ca (OH)2 and that associated with the carbonation of calcium-silicate-hydrate C-S-H using only thermal analysis; 2) determination of the increase in the molar volume of the calcium-silicate-hydrate C-S-H due to carbonation using gas pycnometer, which indicated an increase of about 39 cm3 for 1 mole of C3S2H3 carbonated. The results indicated that the amount of CaCO3 produced by the carbonation of C-S-H is higher than that produced by the carbonation of portlandite.

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Study of Chemical and Physical Characterization of the Natural Dolomite of Ain Mlila-Algeria

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.406.481 ◽

2021 ◽

Vol 406 ◽

pp. 481-491

Author(s):

K. Abdellaoui ◽

A. Boumaza ◽

N. Kamoun

Keyword(s):

Thermal Analysis ◽

Differential Thermal Analysis ◽

Calcium Carbonate ◽

Physical Characterization ◽

Physical Chemical ◽

Geological Conditions ◽

Chemical Techniques ◽

Eastern Algeria ◽

Extrinsic Defects

Dolomite is one of the commonest minerals that abound in the formation of a number of geological conditions. And it is found in abundance in eastern Algeria, especially Ain Mlila-Wilaya of Oum El Bouaghi-Algeria. The analyzed sample of raw dolomite has been by various physical-chemical techniques. The constituents of these carbonates are Ca, Mg, C, O, Al, Si, Fe, Ba, F, and Sr, analysis by XRD, and Raman, show that in addition to CaMg(CO3)2, we may have calcium carbonate. The Photoluminescence analysis characterizes the intrinsic and extrinsic defects of this carbonate. Differential thermal analysis reveals the different transformations of this mineral during heating. Indeed several stages including the elimination of water, the departure of CO2, the formation of MgO, and finally the formation of CaO.

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