Effect of Pair-Mineralizer on the Reaction of Alite and Calcium Langbeinite Formation

2006 ◽  
Vol 510-511 ◽  
pp. 622-625
Author(s):  
Woo Teck Kwon ◽  
Young Phil Kim ◽  
Y. Kim ◽  
Soo Ryong Kim ◽  
Seong Youl Bae
Keyword(s):  
Powder Diffraction ◽  
Calcium Silicate ◽  
Mineralogical Composition ◽  
Experimental Results ◽  
Silicate Minerals ◽  
X Ray

This paper investigates the effect of the pair-minerializer (CaSO4,-CaF2) on the reaction of alite, belite and calcium langbeinite formation with different alkali and sulfate contents. A set of clinker samples was prepared by adding laboratory grade reagents of (NH4)2SO4, CaF2 and K2CO3 to the cement raw mixes. The mineralogical composition of clinker was analyzed by X-ray powder diffraction, and the quantity of minerals was evaluated by using TOPAS software. As the experimental results, the total amount of calcium silicate minerals was rapidly increased with the addition of F and SO3 components simultaneously as pair-mineralizer with K2O more than the value which mineralizer was added separately. Also, in the case of adding K2O only to the raw mixes, the amount of alite is decreased after clinkering. However, if alkali (K2O) and pair-minerializer (CaSO4,-CaF2) were added simultaneously, the quantity of alite and calcium langbeinite mineral increased because of the formation of stable clinker minerals by the reaction of alkali (K2O) and sulfate.

The Role of Alum in the Fabrication of Calcium Silicate for Dissolved Acetylene Cylinders

2011 ◽  
Vol 117-119 ◽  
pp. 870-872
Author(s):  
Shi Cai Cui ◽  
Zhao Bo Meng
Keyword(s):  
Phase Composition ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Powder Diffraction ◽  
Calcium Silicate ◽  
Filling Material ◽  
X Ray ◽  
Comprehensive Performance ◽  
Scanning Electron

Calcium silicate for filling material used in dissolved acetylene cylinders was prepared by adding alum as additive. Samples were characterized by X-ray powder diffraction (XRD) and scanning electron microscope (SEM). The effects of alum on the bleeding, shrinkage, strength, porosity, morphology and phase composition were studied. The experimental results show that the adding of alum can improve the comprehensive performance of samples. The mechanism was discussed in detail.

X-ray powder diffraction of mineral pigments and medicines from the 17th century pharmacy (Spezieria) Santa Maria della Scala in Rome, Italy

2018 ◽  
Vol 33 (4) ◽  
pp. 270-278
Author(s):  
Giovanni Cavallo ◽  
Maria Luisa Vázquez de Ágredos Pascual
Keyword(s):  
Powder Diffraction ◽  
Mineralogical Composition ◽  
17Th Century ◽  
Inorganic Materials ◽  
Research Project ◽  
X Ray ◽  
Santa Maria ◽  
Material Preparation ◽  
Inorganic Fraction

The pharmacy (spezieria) Santa Maria della Scala was founded in Rome by the Discalced Carmelites Order in the 17th century, and during the 18th and 19th centuries it became the official supplier of medicines for Vatican Popes. The laboratory and the cases of this spezieria still preserve glass jars with organic and inorganic materials, which were presumably used for medicine and artistic material preparation, whose composition is unknown to date. A research project was initiated with the aim to study the stored materials and the role that the pharmacy played in regional, national and international contexts. In this manuscript, the compounds were analysed through X-ray powder diffraction with the scope to derive the quantitative mineralogical composition of the inorganic fraction, their possible use in pharmacopoeias and as mineral pigments. Most of the analysed samples are salts (sulphates, chlorides, carbonates, phosphates, borates, sulphides), sulphates being the predominant class; oxides were also detected.

Influence of Different Sintering System on the Formation of Tricalcium Aluminate

2010 ◽  
Vol 150-151 ◽  
pp. 741-744
Author(s):  
Jun Xiao ◽  
Bao Guo Ma ◽  
Hong Bo Tan
Keyword(s):  
Phase Equilibria ◽  
Microwave Heating ◽  
Powder Diffraction ◽  
Experimental Results ◽  
Electrical Heating ◽  
Al2o3 Powder ◽  
X Ray ◽  
Tricalcium Aluminate

Several different sintering systems about the formation of C3A ,by mixing CaO and Al2O3 powder, are studied in this experiment. The sample is characterized by glycerol ethanol method, X-ray powder diffraction and TG-DTA. The experimental results show that: reducing the react time cannot boost the formation of C3A, but traditionally electrical heating combined microwave heating can romote the formation of C3A rapidly .In terms of phase equilibria of CaO-Al2O3 system, pure C3A cann’t be synthesized by sintering . Except the samples also contain minor amounts of CA and C12A7.

Special Aspects of Hydration Process of Microfine Cement

2015 ◽  
Vol 725-726 ◽  
pp. 578-583 ◽  
Author(s):  
Irina Ivanova ◽  
Andrey Pustovgar ◽  
Aleksey Eremin ◽  
Aleksey Adamtsevich
Keyword(s):  
Powder Diffraction ◽  
Isothermal Calorimetry ◽  
Mineralogical Composition ◽  
Hydration Process ◽  
Hydration Products ◽  
Cement Pastes ◽  
X Ray ◽  
Microfine Cement ◽  
Microfine Cements

The aim of the present research was to determine special features of hydration process of two commercial microfine cements compared to CEM I 42.5N cement with similar mineralogical composition. The influence of cement fineness and composition on the hydration process was investigated by isothermal calorimetry of cement pastes and quantitative X-ray powder diffraction of hydration products at 1, 3, 7, 14 and 28 days.

Artefacts from Ban Chiang, Thailand: pottery with hematite-red geometric patterns

2020 ◽  
Vol 235 (11) ◽  
pp. 559-568
Author(s):  
Ulrich Bismayer ◽  
Sutham Srilomsak ◽  
Yaowapa Treekamol ◽  
Waraporn Tanthanuch ◽  
Kanokwalee Suriyatham
Keyword(s):  
Ftir Spectroscopy ◽  
Bronze Age ◽  
Iron Age ◽  
Powder Diffraction ◽  
Mineralogical Composition ◽  
Optical Reflectance ◽  
Thin Sections ◽  
X Ray ◽  
Geometric Patterns ◽  
Ban Chiang

AbstractBan Chiang () is an extensively studied archeological site in Northeast Thailand, Udon Thani Province, which became a UNESCO world heritage in 1992. Depending on their production period ceramic artefacts show characteristic patterns at the surface which may be interpreted as iconographic motifs for the site. Two ceramic samples, excavated in 2003, from different periods were re-investigated, previously studied by Tanthanuch W., Pattanasiriwisawa W., Somphon W., Srilomsak S. Synchrotron studies of Ban Chiang ancient pottery. Suranaree J. Sci Technol. 2011, 18, 15–28 who focussed on thermal firing and redox-conditions. Shards selected for this study were sample 5412-S6E15 dated from Bronze Age (ca. 1000–300 BC) with yellow-brown, paint-free surface and a younger sample 8027 from Iron Age (ca. 300 BC–200 AD) with red painted design carrying pictorial patterns typical for the Ban Chiang ceramics. The surface material and colour of both shards was studied in detail using optical reflectance, FTIR spectroscopy and X-ray powder diffraction. Thin sections were used to determine the thickness of the red paint and the elemental composition of the surface using an electron microprobe. Chemical composition of sample 5412-S6E15 consists as oxides of elements mainly of SiO2 and Al2O3 (representing ca. 59 and 20 wt. %) and that of the red colour of the youngest sample 8027 consists mainly of SiO2, Al2O3 and Fe2O3 (representing ca. 52, 13 and 13 wt. %), the average composition adjacent to the red painted area has ca. 72 wt. % SiO2, ca. 10 wt. % Al2O3 and only 2 wt. % Fe2O3. X-ray powder diffraction, FTIR spectroscopy and optical reflectance measurements confirm hematite in the mineralogical composition of the red pigment of shard 8027.

Accurate quantification of the modal mineralogy of rocks when image analysis is difficult

2002 ◽  
Vol 66 (1) ◽  
pp. 189-200 ◽  
Author(s):  
P. F. Schofield ◽  
K. S. Knight ◽  
S. J. Covey-Crump ◽  
G. Cressey ◽  
I. C. Stretton
Keyword(s):  
Image Analysis ◽  
Powder Diffraction ◽  
Diffraction Data ◽  
Mineralogical Composition ◽  
Cost Effective ◽  
Powder Diffraction Data ◽  
X Ray ◽  
Fine Grained ◽  
Neutron Powder Diffraction Data ◽  
Residual Strains

AbstractThe volume proportions of the mineral phases in two strongly deformed olivine-orthopyroxene rocks have been quantified by whole-pattern stripping of fixed geometry X-ray powder diffraction data. The results were compared with the phase proportions as determined by Rietveld refinement of time-of-flight neutron powder diffraction data, and were shown to be in excellent agreement. The X-ray technique not only provides a very rapid and cost-effective method of determining phase proportions, but it also circumvents several of the problems associated with obtaining this information by image analysis. Moreover, the technique is particularly advantageous in strongly textured rocks or in rocks that contain significant residual strains. As such it offers a powerful technique for analysing the mineralogical composition of fine-grained and/or deformed experimental run products, which makes it of considerable potential for monitoringin situthe progress of mineral reactions during laboratory experiments.

Diagnostics of Gold Laser Plasmas

1988 ◽  
Vol 102 ◽  
pp. 357-360
Author(s):  
J.C. Gauthier ◽  
J.P. Geindre ◽  
P. Monier ◽  
C. Chenais-Popovics ◽  
N. Tragin ◽  
...  
Keyword(s):  
Experimental Results ◽  
Pure Gold ◽  
Electronic Temperature ◽  
X Ray ◽  
Laser Plasmas ◽  
Collisional Radiative Model ◽  
Radiative Model

AbstractIn order to achieve a nickel-like X ray laser scheme we need a tool to determine the parameters which characterise the high-Z plasma. The aim of this work is to study gold laser plasmas and to compare experimental results to a collisional-radiative model which describes nickel-like ions. The electronic temperature and density are measured by the emission of an aluminium tracer. They are compared to the predictions of the nickel-like model for pure gold. The results show that the density and temperature can be estimated in a pure gold plasma.

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