scholarly journals Application of In Situ Calcium Carbonate Process for Producing Papermaking Fillers from Lime Mud

ACS Omega ◽  
2021 ◽  
Vol 6 (5) ◽  
pp. 3884-3890
Author(s):  
Jung Soo Han ◽  
Dong Suk Kang ◽  
Yung Bum Seo
Keyword(s):  
Calcium Carbonate ◽  
Lime Mud

A TEM study of the microstructure of avian eggshells

1992 ◽  
Vol 50 (2) ◽  
pp. 1102-1103
Author(s):  
S. Q. Xiao ◽  
S. Baden ◽  
A. H. Heuer
Keyword(s):  
Electron Microscope ◽  
Calcium Carbonate ◽  
Nucleation And Growth ◽  
Growth Mechanisms ◽  
Shell Surface ◽  
Thin Sections ◽  
Polycrystalline Metals ◽  
Transmission Electron ◽  
Nucleation And Growth Mechanisms

The avian eggshell is one of the most rapidly mineralizing biological systems known. In situ, 5g of calcium carbonate are crystallized in less than 20 hrs to fabricate the shell. Although there have been much work about the formation of eggshells, controversy about the nucleation and growth mechanisms of the calcite crystals, and their texture in the eggshell, still remain unclear. In this report the microstructure and microchemistry of avian eggshells have been analyzed using transmission electron microscope (TEM) and energy dispersive spectroscopy (EDS).Fresh white and dry brown eggshells were broken and fixed in Karnosky's fixative (kaltitanden) for 2 hrs, then rinsed in distilled H2O. Small speckles of the eggshells were embedded in Spurr medium and thin sections were made ultramicrotome.The crystalline part of eggshells are composed of many small plate-like calcite grains, whose plate normals are approximately parallel to the shell surface. The sizes of the grains are about 0.3×0.3×1 μm3 (Fig.l). These grains are not as closely packed as man-made polycrystalline metals and ceramics, and small gaps between adjacent grains are visible indicating the absence of conventional grain boundaries.

scholarly journals Pembuatan PCC (Precipitated Calcium Carbonate) Menggunakan Bahan Baku Lime Mud Dengan Metode Kaustik Soda

2020 ◽  
Vol 2 (2) ◽  
Author(s):  
Gina Maulia
Keyword(s):  
Calcium Carbonate ◽  
Precipitated Calcium Carbonate ◽  
Green Liquor ◽  
White Liquor ◽  
Lime Mud

Recausticizing merupakan proses pengolahan green liquor menjadi white liquor sebagai produk utama dan lumpur kapur (lime mud) sebagai produk samping. Lime mud sebagai produk samping memiliki kandungan CaCO3 yang cukup tinggi sehingga memungkinkan untuk dimanfaatkan menjadi produk yang bernilai jual lebih tinggi. Penelitian ini bertujuan untuk memanfaatkan lime mud sebagai bahan baku pembuatan PCC (Precipitated Calcium Carbonate) yang memiliki nilai jual lebih tinggi. Penelitian pembuatan PCC ini menggunakan metode kaustik soda dengan variasi dosis HNO3 1 M, 3 M, 5 M, 7 M, 9 M, 11 M, dan 12 M kemudian ditambahkan Na2CO3 untuk pembentukan PCC. Berdasarkan hasil penelitian, didapatkan dosis optimum yaitu pada konsentrasi HNO3 12 M dan Na2CO3 2 M dengan nilai rendemen 97.1 % dan kemurnian 99.57 % yang menunjukkan bahwa hasil tersebut sesuai dengan standar PCC.

Effect of a Calcium Carbonate-Based Dentifrice on in situ Enamel Remineralization

2005 ◽  
Vol 39 (3) ◽  
pp. 255-257 ◽  
Author(s):  
J.A. Cury ◽  
G.S. Simões ◽  
A.A. Del Bel Cury ◽  
N.C. Gonçalves ◽  
C.P.M. Tabchoury
Keyword(s):  
Calcium Carbonate

Crystallization of Calcium Carbonate Observed In-situ by Combined Small- and Wide-angle X-ray Scattering

2003 ◽  
Vol 107 (22) ◽  
pp. 5123-5125 ◽  
Author(s):  
Diego Pontoni ◽  
Joerg Bolze ◽  
Nico Dingenouts ◽  
Theyencheri Narayanan ◽  
Matthias Ballauff
Keyword(s):  
Calcium Carbonate ◽  
Wide Angle ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

Gel-Like Calcium Carbonate Precursors Observed by in situ AFM

Langmuir ◽  
2016 ◽  
Vol 33 (1) ◽  
pp. 158-163 ◽  
Author(s):  
Stefan L. P. Wolf ◽  
Leonardo Caballero ◽  
Francisco Melo ◽  
Helmut Cölfen
Keyword(s):  
Calcium Carbonate
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