Change of Formation Yield and Characterization of PCC Particle Synthesized with Impurity Ions Contents by Carbonation Process

2006 ◽  
Vol 510-511 ◽  
pp. 1026-1029
Author(s):  
Jin Sang Cho ◽  
Sung Min Joo ◽  
Sang Hwan Cho ◽  
Young Hwan Yu ◽  
Im Ho Kim ◽  
...  
Keyword(s):  
Particle Size ◽  
Calcium Carbonate ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Precipitated Calcium Carbonate ◽  
Carbonation Process ◽  
Crystal Properties ◽  
Impurity Ions

The effect of the impurity ions Al3+, Fe3+ and Mg2+ on the formation yield and crystal properties of precipitated calcium carbonate(PCC) produced by the carbonation process was investigated in Ca(OH)2-H2O-CO2 system. The effect of the impurity ions Al3+, Fe3+ and Mg2+ on the formation yield using particle size distribution and morphology of PCC were discussed. The particle size distribution of PCC was increased with increase of impurity ions. The morphology was transformed in order of spheroidal, scalenohedral, rhombohedral calcite for Al3+, Fe3+ and rhombospheroidal, spherical, scalenohedral for Mg2+ with increase of impurity ions.

Filler Pigments Designed for Recyclability

1992 ◽  
Vol 266 ◽  
Author(s):  
June D. Passaretti ◽  
Trudy D. Young ◽  
Mick J. Herman ◽  
D. Bruce Evans
Keyword(s):  
Particle Size ◽  
Calcium Carbonate ◽  
Particle Size Distribution ◽  
Physical Properties ◽  
Size Distribution ◽  
Paper Industry ◽  
Precipitated Calcium Carbonate ◽  
Recycled Paper ◽  
New Material ◽  
The Cost

AbstractThis paper discusses the use of a new rhombohedral precipitated calcium carbonate (PCC) morphology and existing PCC morphologies in wood free, wood containing, and recycled paper. The new material has properties that mimic TiO2 with respect to morphology, particle size, particle size distribution, and surface area. TiO2 is widely used by the paper industry as a functional filler for opacity and brightness. The new PCC rhombohedral morphology can be used in place of TiO2 for many applications greatly reducing the cost of production.The physical properties of the new PCC morphology as well as application as a paper filling pigment will be discussed.

Effect of Several Factors on the Synthesis of Calcium Hydroxide Prepared by Spray Drying Method Using Limestone

2007 ◽  
Vol 544-545 ◽  
pp. 733-736
Author(s):  
Moon Kwan Choi ◽  
Jin Sang Cho ◽  
Sung Min Joo ◽  
Jin Koo Park ◽  
Ji Whan Ahn ◽  
...  
Keyword(s):  
Particle Size ◽  
Calcium Carbonate ◽  
Spray Drying ◽  
Feeding Rate ◽  
Spherical Shape ◽  
Initial Reaction ◽  
Outlet Temperature ◽  
Drying Method ◽  
Precipitated Calcium Carbonate ◽  
Carbonation Process

The purpose of this work is to influence of CaO concentrations of 5.0 wt.% and 10.0 wt.%, slurry feeding rate of 200~400 /min, rotating rate of drum of 5,000 and 10,000 rpm, inlet and outlet temperature on the synthesis of Ca(OH)2 powder, and the synthesis of precipitated calcium carbonate by carbonation process using Ca(OH)2 prepared by spray drying method. As the feeding rate of slurry was increased, the particle size of Ca(OH)2 was decreased. Regardless of rotating rate of drum, when the concentration of CaO was 5.0 wt.% and 10.0 wt.%, the morphology of Ca(OH)2 showed spherical shape of 10~30 μm and 20~60 μm, respectively. The specific surface area of synthesized Ca(OH)2 was 27~30 m2/g. When the initial reaction temperature was 11 °C and 30 °C, the shape and particle size of precipitated calcium carbonate synthesized in the carbonation process showed the rectangular shape of 0.1~0.4 μm and the spindle shape of 0.5~1.0 μm, respectively.

WITHIN-PEDON VARIABILITY IN SOIL PROPERTIES

1982 ◽  
Vol 62 (4) ◽  
pp. 631-639 ◽  
Author(s):  
G. T. PATTERSON ◽  
G. J. WALL
Keyword(s):  
Particle Size ◽  
Organic Matter ◽  
Calcium Carbonate ◽  
Particle Size Distribution ◽  
Soil Properties ◽  
Size Distribution ◽  
Organic Matter Content ◽  
Matter Content ◽  
Soil Drainage ◽  
Soil Material

Replicate soil samples (2–20) from the A, B and C horizons of 41 pedons were collected to measure within-pedon variability of particle size distribution, organic matter content, calcium carbonate equivalent and pH. Variability in soil properties was examined in relation to the mode of origin of the soil material, soil horizonation and soil drainage. Variance in particle size distribution was significantly influenced by mode of deposition as well as by soil horizons, while soil drainage had no significant influence on the variation in particle size distribution. Variance in calcium carbonate equivalent and organic matter content was not influenced by soil drainage or mode of deposition. The number of replicate samples required for statistically reliable evaluation of a pedon at given confidence limits was determined for the soil properties studied. The results of these calculations indicate the need for up to five replicate samples to achieve satisfactory levels of accuracy at the 95% confidence level for some of the soil properties studied.

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