scholarly journals Iron ore filtration process improvement through pH modification

2021 ◽  
Vol 3 (4) ◽  
Author(s):  
Alexandre Gonçalves Andrade ◽  
Maycon Athayde
Keyword(s):  
Calcium Carbonate ◽  
Iron Ore ◽  
Comprehensive Evaluation ◽  
Saturation Index ◽  
Scale Up ◽  
Filtration Process ◽  
Experimental Procedure ◽  
Carbonate Deposition ◽  
Calcium Carbonate Deposition ◽  
Ph Range

AbstractThe present study presents the effect of pH reduction in iron ore slurry for an iron ore filtration process. A reduction on moisture content and increase on filters throughput was proposed by the pH modification. The experimental procedure included bench scale tests and industrial scale up of the observed results. Additionally, Langelier’s saturation index was applied to determine the optimum pH range for the filtration operation. The calcium carbonate deposition test was developed and evaluated in the present study. A comprehensive evaluation at different pH ranges was performed leading to identify the calcium carbonate deposition critical point.

Environment of calcium carbonate deposition west of Andros Island, Bahamas

10.3133/pp350 ◽  
1962 ◽  
Author(s):  
Preston E. Cloud ◽  
P.D. Blackmon ◽  
F.D. Sisler ◽  
Henry Kramer ◽  
J.H. Carpenter ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Carbonate Deposition ◽  
Andros Island ◽  
Calcium Carbonate Deposition

scholarly journals A Novel Method for Calcium Carbonate Deposition in Wood That Increases Carbon Dioxide Concentration and Fire Resistance

Coatings ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 72
Author(s):  
Vicente Hernandez ◽  
Romina Romero ◽  
Sebastián Arias ◽  
David Contreras
Keyword(s):  
Carbon Dioxide ◽  
Weight Gain ◽  
Calcium Carbonate ◽  
Fire Resistance ◽  
Carbon Dioxide Concentration ◽  
Wood Products ◽  
Vacuum Impregnation ◽  
Carbonate Deposition ◽  
Novel Method ◽  
Calcium Carbonate Deposition

In this study, a novel method for calcium carbonate deposition in wood that increases carbon dioxide concentration and fire resistance is proposed. The method promoted the mineralization of radiata pine wood microstructure with calcium carbonate by using a process consisting in the vacuum impregnation of wood with a calcium chloride aqueous solution and the subsequent sequential diffusion of gaseous ammonium and carbon dioxide. In the most favorable conditions, the method yielded a weight gain of about 20 wt.% due to mineralization, which implied the accumulation of 0.467 mmol·g−1 of carbon dioxide in the microstructure of wood. In addition, a weight gain of about 8% was sufficient to provide fire resistance to a level similar to that achieved by a commercially available fire-retardant treatment. The feasibility of retaining carbon dioxide directly inside the wood microstructure can be advantageous for developing wood products with enhanced environmental characteristics. This method can be a potential alternative for users seeking materials that could be effective at supporting a full sustainable development.

scholarly journals Studies on Calcium Carbonate Deposition of a Calcareous Red Alga Serraticardia maxima

1970 ◽  
Vol 83 (984) ◽  
pp. 193-201 ◽  
Author(s):  
Megumi OKAZAKI ◽  
Tomoyoshi IKAWA ◽  
Kurazo FURUYA ◽  
Kazutosi NISIZAWA ◽  
Tomoo MIWA
Keyword(s):  
Calcium Carbonate ◽  
Red Alga ◽  
Carbonate Deposition ◽  
Calcium Carbonate Deposition

scholarly journals Calcium cyclic carboxylates as structural models for calcium carbonate scale inhibitors

CrystEngComm ◽  
2020 ◽  
Vol 22 (15) ◽  
pp. 2585-2592
Author(s):  
Yuexian Hong ◽  
Dmitry S. Yufit ◽  
Nathalie Letzelter ◽  
Jonathan W. Steed
Keyword(s):  
Molecular Structure ◽  
Calcium Carbonate ◽  
Significant Variation ◽  
Structural Models ◽  
Carbonate Deposition ◽  
Calcium Complexes ◽  
Calcium Carbonate Deposition ◽  
Structure Lead ◽  
Calcium Carbonate Scale ◽  
Inhibition Ability

Calcium complexes of cyclic oligocarboxylic acids have been studied as models to understand how subtle changes in molecular structure lead to significant variation in inhibition ability for calcium carbonate deposition

scholarly journals Zooxanthellae (Symbiodinium, Dinophyceae) symbioses on coral reefs

2009 ◽  
Vol 30 (2) ◽  
pp. 67
Author(s):  
Madeleine JH van Oppen ◽  
Ingo Burghardt
Keyword(s):  
Calcium Carbonate ◽  
Coral Reefs ◽  
Nutrient Cycling ◽  
Three Dimensional ◽  
Scleractinian Corals ◽  
Tropical Waters ◽  
Stony Corals ◽  
Carbonate Deposition ◽  
Calcium Carbonate Deposition

The large three-dimensional structures that make up coral reefs are primarily the product of calcium carbonate deposition by zooxanthellate scleractinian corals, i.e., stony corals living in symbiosis with dinoflagellate algae of the genus Symbiodinium (a.k.a. zooxanthellae). This photosymbiosis permits fast nutrient cycling in the generally oligotrophic tropical waters.

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