scholarly journals Synthetic Calcium Carbonate for Reinforcement Filler Made from Domestic Raw Material, ^|^ldquo;Limestone^|^rdquo;

2013 ◽  
Vol 86 (6) ◽  
pp. 181-187
Author(s):  
Shoichi TSUTSUI
Keyword(s):  
Calcium Carbonate ◽  
Raw Material

PREPARATION OF PRECIPITATED CALCIUMCARBONATE USING ADDITIVE AND WITHOUT ADDITIVE

2015 ◽  
Vol 77 (3) ◽  
Author(s):  
Anuar Othman ◽  
Nasharuddin Isa ◽  
Rohaya Othman
Keyword(s):  
Calcium Carbonate ◽  
Calcium Hydroxide ◽  
Mineral Composition ◽  
Hydrated Lime ◽  
Raw Material ◽  
Precipitated Calcium Carbonate ◽  
Uniform Size ◽  
The One

Precipitated calcium carbonate (PCC) chemically can be synthesized in the laboratory. In this study, hydrated lime or calcium hydroxide was used as raw material with sucrose as additive to produce PCC. The process was compared with the one without additive. PCC produced was observed based on morphology, mineral composition and size by using Fesem-Edx and LPSA, respectively. PCC products without additive demonstrated fine and more uniform size of calcite PCC as compared to the one with additive. Nevertheless, the process with additive produced more PCC product than without additive.

Steel Converter Slag as a Raw Material for Precipitation of Pure Calcium Carbonate

2008 ◽  
Vol 47 (18) ◽  
pp. 7104-7111 ◽  
Author(s):  
Sanni Eloneva ◽  
Sebastian Teir ◽  
Justin Salminen ◽  
Carl-Johan Fogelholm ◽  
Ron Zevenhoven
Keyword(s):  
Calcium Carbonate ◽  
Converter Slag ◽  
Raw Material ◽  
Steel Converter

Production of Primary Magnesium by the Aluminothermic Reduction of Magnesia Extracted from Dolomite Ore

2014 ◽  
Vol 788 ◽  
pp. 28-33
Author(s):  
Peng Deng ◽  
Yu Qin Liu ◽  
Wen Gui Yao ◽  
Hong Wen Ma
Keyword(s):  
Calcium Carbonate ◽  
Magnesium Oxide ◽  
Vacuum Condition ◽  
Reduction Ratio ◽  
Raw Material ◽  
Aluminothermic Reduction ◽  
Molar Ratio ◽  
New Process

In this paper, a new process for the production of the primary magnesium is introduced using the dolomite as the raw material. The magnesia and calcium carbonate were prepared from dolomite by acidification. The content of magnesium oxide can reach 98.92% about the magnesia obtained. The magnesia is used to produce primary magnesium by aluminothermic reduction under vacuum condition. The reduction ratio of MgO can be up to 86.14% under the temperature of 1200°C for 5hrs, briquetting pressure of 10MPa and the molar ratio of MgO to Al of 3:2. The content of magnesium is more than 99.90%. The major phases in the briquette residue are corundum and spinel, which can be used as refractory.

Explorative Synthesis of Magnetic Ca-Fe-O Compounds by Mixing Precipitated CaCO3 from Limestone and Iron Sand Extracted – Fe2O3.H2O

2015 ◽  
Vol 827 ◽  
pp. 203-207 ◽  
Author(s):  
Mastuki ◽  
Malik Anjelh Baqiya ◽  
Darminto
Keyword(s):  
Calcium Carbonate ◽  
Sintering Temperature ◽  
Raw Material ◽  
Phase Content ◽  
Precipitated Calcium Carbonate ◽  
Mixing Method

Synthesis of Ca-Fe-O using solution mixing method employing CaCO3 and Fe2O3•H2O has been conducted. Extraction of limestone as the raw material of precipitated calcium carbonate (PCC) and iron sands as that of Fe2O3•H2O was prepared to explore various compound of C-Fe-O, where the CaFe4O7 phase is mainly expected. The PCC and Fe2O3•H2O each are dissolved in 1 M HNO3 and mixed to be most homogeneous. The results of the synthesis are characterized by DTA/GTA and then sintered at temperatures of 800°C, 900°C and 1000°C.The sintered samples were characterized by XRD, FTIR, and VSM. The sintering temperature at 800°C, 900°C and 1000°C gave result the phase content of CaFe4O7 being respectively 55.42%, 44.55% and 36.39%. Other major phases in the Ca-Fe-O samples consist of Ca2Fe9O13 and Ca4Fe14O25. The remanence value of the corresponding samples is 2.11, 1.28, and 1.74 emu/g respectively.

scholarly journals Statistical Modeling of Environmental Factors on Microbial Urea Hydrolysis Process for Biocement Production

2015 ◽  
Vol 2015 ◽  
pp. 1-14 ◽  
Author(s):  
Hamed Khodadadi Tirkolaei ◽  
Huriye Bilsel
Keyword(s):  
Calcium Carbonate ◽  
Environmental Factors ◽  
Bacterial Growth ◽  
Characteristic Curve ◽  
Urea Hydrolysis ◽  
Raw Material ◽  
Specific Rate ◽  
Logarithmic Scale ◽  
Calcium Carbonate Precipitation ◽  
Face Centered

Calcium carbonate is a widely used raw material by many industries. It can be precipitated through microbial process within soil pores as cementitious bonding agent between grains for geotechnical applications. It is called microbially induced calcium carbonate precipitation (MICP). Designing an appropriate biogrout material for injection into soil is essential for controlling the amount, type, time, and place of the biocement production within pores. For this purpose, understanding the active reactions and the kinetics of bacterial growth and urea hydrolysis is necessary. A conductometric method and spectrophotometry were used in this study to, respectively, monitor the urea hydrolysis reaction progress and bacterial growth inS. pasteurii-inoculated urea-NB-NH4Cl solution at different level of the environmental factors that are initial cell concentration, urea concentration, and temperature. Variation in conductivity of the solution versus logarithmic scale of time was depicted as microbial ureolysis characteristic curve (MUCC) through which lag duration, specific rate, and potential of urea hydrolysis at each condition were obtained. Central composite face-centered (CCF) design, which is one of the response surface methodologies, was employed to statistically fit polynomial models explaining the bacterial growth and the characteristics obtained from MUCCs in terms of the environmental factors and their interactions. An optimization analysis based on the urea-normalized responses was also carried out.

Rubber Resins: Some Properties and Possibilities of Use

1944 ◽  
Vol 17 (3) ◽  
pp. 731-737
Author(s):  
Charles F. Mason
Keyword(s):  
Calcium Carbonate ◽  
Solid Solutions ◽  
Raw Material ◽  
Gutta Percha ◽  
Sulfur Chloride ◽  
Mechanical Mixtures ◽  
Electric Cables

Abstract However, their present uses and possible future uses deserve consideration. Their tendency to thicken in certain solvents has been applied to use in imparting false body (thickening) to certain varnishes. In such cases it is likely that the rubber resin is modified to reduce tackiness before compounding it into quick-drying spirit varnishes. As plasticizers for brittle resins and asphalts they afford a very inexpensive raw material. But, again, experiments must be performed to see if the rubber resin is compatible with the natural or synthetic one, as there is little information as to whether plasticizers form solid solutions or only mechanical mixtures with the resins after heating and mixing. In one case a large shoe manufacturer purchased many tons of gutta-percha resin for impregnation of threads used in sewing on soles; the object was to prevent the entrance of moisture into the shoe and to supply a flexible adhesive. Electric friction tape, which must have an eversoft tacky surface, is coated with a compound of a bitumen, regenerated rubber, and a gutta resin, and is similar in composition to readily appliable insulation pastes, which are used on underground electric cables. The use in ever-soft adhesives and in flypaper are only two of the minor ones. The application of these resins to textiles in the form of emulsions shows large possibilities, as they can be emulsified with ammonium oleate or linoleate and, on drying, leave behind films of rubber resin and the fat acid of the emulsifier. A hardened balata resin has been used in linoleum cement. The soft resin or even the oily one can be hardened by heating for four hours at 80° C, after adding 1 per cent of manganese resinate or 0.5 per cent of calcium carbonate. Treatment of the same resin with sulfur chloride results in a viscous resin which, when warm, can be pulled out into ropes like taffy candy and, when cold, is still viscous. In closing, the writer wishes to state that, even if a reader may fail to find here the exact information he desires about a certain rubber resin, let it be hoped that what information he does find will save many hours of fruitless toil.

Innovative Preparation Calcium Hydroxyapatite from Duck Eggshell via Pyrolysis

2016 ◽  
Vol 851 ◽  
pp. 8-13
Author(s):  
Nuchnapa Tangboriboon ◽  
Jularpar Suttiprapar
Keyword(s):  
Calcium Carbonate ◽  
Calcium Phosphate ◽  
High Purity ◽  
Average Particle Size ◽  
Calcium Hydroxyapatite ◽  
Environmental Conservation ◽  
Raw Material ◽  
Carbonate Content ◽  
Average Particle ◽  
Ceramic Yield

Calcium hydroxyapatite made from duck eggshell react to phosphoric acid with the Ca/P mole ratio 1.67 and calcined at 800º, 900º, and 1000°C for each temperature 2 hr. Duck eggshell is a source of calcium carbonate having high purity content more than 98.101 %w/w and small amount of other metal oxides. Duck eggshell is a bio-material similar to other calcium sources i.e. coral, animal bone, and seashell. There are many advantages of using duck eggshell as a raw material such as abundant, low price, high purity of calcium carbonate content, easy to calcium phosphate formation, biocompatibility, bioactive, non-toxic for human, and the high percentage of ceramic yield 69.73%w/w. In addition, one of the most important advantages is to reduce the amount of duck eggshell waste from household and food industries as environmental conservation. The optimum condition to obtain high purity hydroxyapatite is sintering calcium phosphate at 1000°C for 2 hr. The average particle size, specific surface are, pore diameter, and true density of sample sintered at 1000°C for 2 hr are 39.92 µm, 2.12 m2/g, 98.96 Å, 3.02 g/cm3, respectively, in soft fine white powder. Furthermore, the results obtained by XRF, SEM, and XRD confirmed of sample fired at 1000°C for 2 hr to be calcium hydroxyapatite (HA, Ca10(PO4)6(OH)2) of Ca/P mole ratio 1.67 and small amount of calcium phosphate (β-TCP, Ca3PO4) of Ca/P mole ratio 1.5. Therefore, the duck eggshell is a potentially bio-ceramic material to prepare calcium hydroxyapatite applied for biomedical, bio-dental, and many industries i.e. pharmaceutical, toothpaste, cosmetic, and nutrient food etc.

Influence of Firing Regime and Potassium Ions on Synthetic Preparation of Belite Clinker

2019 ◽  
Vol 296 ◽  
pp. 64-69
Author(s):  
Dominik Gazdič ◽  
Marcela Fridrichová ◽  
Karel Dvořák ◽  
Adéla Halešová ◽  
Dalibor Všianský
Keyword(s):  
Calcium Carbonate ◽  
Xrd Analysis ◽  
Potassium Sulfate ◽  
Raw Material ◽  
Firing Process ◽  
Potassium Ions ◽  
Stoichiometric Ratio ◽  
Firing Regime ◽  
Mineralogical Analysis ◽  
Two Temperature

The study of the influence of selected temperature regime and potassium ions on the process of synthesis of belite (2CaO·SiO2, C2S) was carried out. The basic raw material was calcium carbonate (CaCO3) and amorphous silica (SiO2). The dosage of both components was based on the stoichiometric ratio of CaO:SiO2 in belite. The modification of the raw meal was carried out in the form of potash, K2O. Potash was dosed in the form of potassium carbonate, K2CO3, and potassium sulfate, K2SO4. The firing process was performed in a superkanthal furnace with two temperature modes, firing temperature: 1150 °C / 3 hours soaking and 1450 °C / 5 hours soaking. The evaluation performed by the experiment was based on mineralogical analysis by XRD analysis.

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