- Type of paper
: Paper in journal
Title: ACTIVATED SINTERING OF MAGNESIUM OXIDE OBTAINED FROM SEA
WATER
- Authors:
- Martinac, Vanja (119805)
- Petric, Nedjeljka (36702)
- Mirošević-Anzulović, Meri (71082)
Journal: Hemijska industrija
Number: 4
ISSN: 0367-598
Volume: 45
Year: 1991
Pages: from 167 to 171
Number of references: 6
Language: hrvatski
Summary: The density dependence of sintered magnesium oxide,
obtained fromsea water by substoichiometric and
overstoichiometricprecipitation with dolomite lime and p.a. magnesium
oxide, upontwo variables has been examined, viz. the sintering
temperatureand the respective contents of SiO2 and Al2O3. The total and
theapparent porosity of the sintered samples also has been
assessed.Mathematical expressions
for these relations have been defined on hand of results fromseveral sample
lines and the most appropriate functions have beenselected.
Keywords: magnesim oxide from sea water, sintering, sintering temperature, activated sintering, porosity
- Type of paper
: Paper in journal
Title: A STUDY OF PROPERTIES AND DEVELOPMENT OF FORSTERITE AND OF
SPINEL FORMATION IN ISOTHERMAL SINTERING OF MAGNESIUM OXIDE OBTAINED FROM
SEA WATER
- Authors:
- Petric, Nedjeljka (36702)
- Petric, Bartul (67706)
- Martinac, Vanja (119805)
- Tkalčec, Emilija (49605)
- Ivanković, Hrvoje (107251)
Journal: Hemijska industrija
Number: 12
ISSN: 0367-598
Volume: 44
Year: 1990
Pages: from 353 to 356
Number of references: 10
Language: hrvatski
Summary: The forsterite and spinel reactions, viz. 2MgO + SiO2 =
Mg2SiO4and MgO + Al2O3 = MgAl2O4 respectively have been examined
inisothermal sintering of magnesium oxide as obtained from seawater, and of
magnesium oxide p.a. by thermodynamic processing ofthe results based on
quantitative X - ray analysis. Specificsurface, chemical composition and
dislocation density have beendefined for the magnesium oxide samples under
examination.Sintering has been performed in the temperature from 1300 oC
to1600 oC, during 5 hours of isothermal heating.
Keywords: sintering of magnesium oxide, synthesis of spinel and forserite, isothermal sintering, roentgen ray analysis, specific surface, chemical composistion
- Type of paper
: Paper in journal
Title: APPLICATION OF THE THERMODYNAMIC THEORY TO SOCIAL EVENTS
- Authors:
- Petric, Nedjeljka (36702)
Journal: International Review of Modern Sociology
Number: 1
Volume: 21
Year: 1991
Pages: from 121 to 129
Number of references: 4
Language: engleski
Summary: The termodinamics of open systems may be applied to social
eventsand social development. In this paper, the termodynamic method
isapplied to the society as a system. The principle followed was:not man
against nature, trying to overpower natural laws("arrange the nature") and
thus survive, but man in harmony withnatural laws, man as a part of nature.
The other principle usedwas: "What the storm takes, the calm will not
return" (a proveab)i.e. social events should take place as near to
theequilibrium as possible approaching the reversible process asmuch as
possible. When the second law of the thermodynamics isapplied to society
i.e. social events, enthropy is interpretednot as disorder but as freedom
of individuals.
Keywords: thermodynamic analysis, social events
- Type of paper
: Paper in journal
Title: INFLUENCE OF B2O3 ON ISOTHERMAL SINTERING OF MAGNESIUM
OXIDE OBTAINED FROM SEA WATER
- Authors:
- Petric, Nedjeljka (36702)
- Petric, Bartul (67706)
- Martinac, Vanja (119805)
Journal: Industrial & Engineering Chemistry Research
Volume: 31
Year: 1992
Pages: from 1819 to 1822
Number of references: 7
Language: engleski
Summary: In order to study the magnesium oxide sintering
process,examinations were carried out with different quantities of
TiO2added to magnesium oxide obtained by substoichiometric
andoverstoichiometric precipitation of magnesiu hydrokside from seawater by
dolomite lime. The content of B2O3 in samples sinteredwas examined as a
function of the temperature of isothermalsintering, quantity of TiO2 added,
and method of obtainingmagnesium oxide. The results were analyzed
thermodynamically.
Keywords: magnesium oxide from sea water, substoichiometric precipitation, sintering of magnesium oxide, isothermal sintering process, activated sintering, determination of boron, thermodynamically interpretation
- Type of paper
: Paper in journal
Title: EXAMINATION OF EFFECT OF TiO2 ON BORON CONTENT IN SINTERED
MAGNESIUM OXIDE
- Authors:
- Petric, Nedjeljka (36702)
- Petric, Bartul (67706)
- Martinac, Vanja (119805)
- Labor, Miroslav
Journal: Kemija u industriji
Number: 9
ISSN: 0022-9830
Volume: 43
Year: 1994
Pages: from 363 to 366
Number of references: 8
Language: hrvatski
Summary: The effect of TiO2 addition on possibility of B2O3 removal
from the sample was examined. Two rections result in B2O3 content decrease
in the sintering process. Thermodynamic analysis, used in open systems
thermodynamics, was applied to examination results: functional dependences
of quantity of B2O3 removed (J1) and quantity of CaO which rected with TiO2
(J2) on temperature (T) and duration of isothermal sintering (t) were
analyzed, and coefficients calculated which provided and insigt into mutual
interdependence of both reactions, i.e. both simultaneous irreversible
processes, based on Onsangers phenomenological theses.
Keywords: effect of TiO2, magnesium oxide from sea water, substoichiometrical precipitation, thermodynamic analysis, phenomenological coefficient
- Type of paper
: Paper in proceedings
Title: A STUDY OF INFLUENCE OF B2O3 ON THE PROCESS OF ISOTHERMAL
SINTERING OF MAGNESIUM OXIDE OBTAINED FROM SEA-WATER
- Authors:
- Petric, Nedjeljka (36702)
- Petric, Bartul (67706)
- Martinac, Vanja (119805)
Proceedings title: ETAN
Language: hrvatski
Place: Beograd
Year: 1991
ISBN/ISSN: 86-80509-03-5
Pages: from 39 to 46
Meeting: XXXV JUGOSLOVENSKA KONFERENCIJA ETAN -a
Held: from 06/03/91 to 06/07/91
Summary: In order to study the magnesium oxide sintering
process,examinations were carried out with different quantities of
TiO2added to magnesium oxide obtained by substoichiometrical
andoverstoichiometrical precipitation of magnesium hydroxide fromsea water
by dolomite lime. The content of B2O3 in samplessintered was examined in
dependence of the temperature ofisothermal sintering, quantity of TiO2
added, and method ofobtaining magnesium oxide. The results were
processedthermodynamically.
Keywords: magnesium oxide from sea water, isothermal sintering of magnesium oxide, substoichiometric precipitation, determination of boron, thermodynamical interpretation
- Type of paper
: Paper in proceedings
Title: ACTIVATED SINTERING OF MAGNESIUM OXIDE OBTAINED FROM SEA
WATER
- Authors:
- Petric, Nedjeljka (36702)
- Petric, Bartul (67706)
- Martinac, Vanja (119805)
- Bogdanić, Neven
- Labor, Miroslav
Proceedings title: Zbornik radova (Proceedings)
Language: hrvatski
Place: Zagreb
Year: 1992
Pages: from 17 to 24
Meeting: XV SAVJETOVANJE O TEHNIČKIM DOSTIGNUĆIMA I EKOLOŠKIM RJEŠENJIMA U PROIZVODNJI CEMENTA I AZBEST-VLAKNO CEMENTA
Held: from 11/05/92 to 11/07/92
Summary: The process of isothermal sintering of magnesium oxide
obtainedfrom sea water ( by precipitation with 80 % and 120 % of
thestoichiometric quantity of the precipitation agent rerspectively)and of
magnesium oxide p.a. was examined with addition of 0.5 %TiO2, at a
temperature of 1600 oC, for differing durations ofisothermal sintering and
different pressures applied inproduction of compacts. Product density,
thickening, and porositywere examined, and the results obtained were
analyzedmathematically. The effect of TiO2 in the magnesium oxide samplehas
on the content of B2O3 was also determined. Coefficients havebeen
calculated for dependent reactions, that of formation ofCa2B2O5 and CaTiO3
respectively.
Keywords: magnesium oxide, magnesium oxide from sea water, substoichiometric precipitation, activited sintering of magnesium oxide, thickening of magnesium oxide, porosity, phenomenological coefficiens, determination of boron
- Type of paper
: Paper in proceedings
Title: THE EFFECT OF THE SOLUTION pH ON THE PROPERTIES OF
SINTERED MAGNESIUM OXIDE OBTAINED FROM SEA WATER
- Authors:
- Petric, Nedjeljka (36702)
- Martinac, Vanja (119805)
- Labor, Miroslav
Proceedings title: Zbornik radova (Proceedings)
Language: hrvatski
Place: Split
Year: 1995
ISBN/ISSN: 953-96382-0-8
Pages: from I-13 to I-17
Meeting: XVI.SAVJETOVANJE O TEHNOLOŠKIM DOSTIGNUĆIMA I EKOLOŠKIM RJEŠENJIMA U PROIZVODNJI CEMENTA I VLAKNO-CEMENTNIH PROIZVODA
Held: from 03/09/95 to 03/11/95
Summary: In order to reduce the B2O3 content in sintered magnesium
oxide as much as possible in precipitation with 80 % of the
stoichiometrical quantity of dolomite lime, the effect of the pH of the
agent used for rinsing of the magnesium hydroxide precipitate was examined,
as well as the effect of manitole in sea water before precipitation.
Manitole binds orthoboric acid present in sea water into a weakly
dissociated complex acid HB(OC)4. Magnesium oxide samples were sintered at
1500 oC; duration of isothermal sintering was 1 hour. The paper presents
density and porosity of individual sintered samples.
The ratio CaO/SiO2 indicates that forsterite (Mg2SiO4), monticellite
(CaMgSiO4) and mervinite (Ca3MgSi2O8) are formed during sintering of the
samples.
Keywords: magnesium oxide from sea water, substoichiometrical precipitation, determination of boron, effect of the pH of rinsing solution, effect of the manitole, isothermal sintering of magnesium oxide, ratio CaO/SiO2
- Type of paper
: Summary in proceedings
Title: A STUDY OF INFLUENCE OF B2O3 ON THE PROCESS OF ISOTHERMAL
SINTERING OF MAGNESIUM OXIDE OBTAINED FROM SEA WATER
- Authors:
- Petric, Nedjeljka (36702)
- Petric, Bartul (67706)
- Martinac, Vanja (119805)
Proceedings title: Sinopsisi (Abstracts)
Language: hrvatski
Place: Zagreb
Year: 1991
Pages: from 296 to 296
Meeting: XII SASTANAK KEMIČARA HRVATSKE
Held: from 02/11/91 to 02/13/91
Summary: In order to study the magnesium oxide sintering
process,examinations were carried out with different quantities ofTiO2
added to magnesium oxide obtained by substoichiometrical
andoverstoichiometrical precipitation of magnesium hydroxide fromsea water
by dolomite lime. The content of B2O3 in samplessintered was examined in
dependence of the temperature ofisothermal sintering, quantity of TiO2
added, and method ofobtaining magnesium oxide. The results were
processedthermodynamically.
Keywords: magnesium oxide from sea water, substoichiometric precipitation, isothermal sintering of magnesium oxide, determination of boron, thermodynamical interpretation
- Type of paper
: Summary in proceedings
Title: ISOTHERMAL SINTERING OF MAGNESIUM OXIDE OBTAINED FROM SEA
WATER
- Authors:
- Petric, Nedjeljka (36702)
- Petric, Bartul (67706)
- Martinac, Vanja (119805)
- Labor, Miroslav
Proceedings title: Sinopsisi (Abstracts)
Language: hrvatski
Place: Zagreb
Year: 1993
Pages: from 358 to 358
Meeting: XIII SKUP HRVATSKIH KEMIČARA
Held: from 02/08/93 to 02/10/93
Summary: This paper lists the properties of products obtained by
means ofactivated sintering of magnesium oxide obtained from sea water.
The admixture used were TiO2, SiO2 and Al2O3. Mathematicalexpressions for
effects of sintering process conditions onproduct properties are presented.
The effect of TiO2 on thecontent of undesirable admixtures (B2O3) was
examined relative toproperties of the prodoct obtained by 80 % and 120
%precipitation of magnesium hydroxide from sea water and relativeto the
admixture content. The results were analyzedthermodynamically.
Keywords: magnesium oxide obtained from sea water, activated sintering, isothermal sintering of magnesium oxide, thermodynamic analysis
- Type of paper
: Summary in proceedings
Title: THE INFLUENCE OF MANITOLE AND pH OF THE SOLUTION ON
PROPERTIES OF MAGNESIUM OXIDE OBTAINED FROM SEA WATER
- Authors:
- Petric, Nedjeljka (36702)
- Martinac, Vanja (119805)
- Labor, Miroslav
Proceedings title: Sinopsisi (Abstracts)
Language: hrvatski
Place: Zagreb
Year: 1995
Pages: from G-365 to G-365
Meeting: XIV.SKUP HRVATSKIH KEMIČARA
Held: from 02/06/95 to 02/08/95
Summary: The effect of the pH of the solution used for rinsing the
magnesium hydroxide precipitate (precipitation of magnesium hydroxide takes
places with 80 % of the stoichiometric quantity of dolomite lime), as well
as the effect of manitole in sea water before precipitation were examined,
in order for the boron content in magnesium oxide samples sintered to
become as low as possible. The effect of manitole is better than the effect
of the pH of the rinsing solution.
The paper presents density, porosity and microstructures of individual
sintered samples. The ratio CaO/SiO2 indicates that forsterite (Mg2SiO4),
monticellite ( CaMgSiO4) and mervinite (Ca3MgSi2O8) are formed during
sintering of the samples.
Keywords: magnesium oxide from sea water, effect of the manitole, effect of the pH of solution, determination of boron, isothermal sintering of magnesium oxide
- Type of paper
: Ph.D.
Title: A STUDY OF ISOTHERMAL SINTERING OF MAGNESIUM OXIDE
Faculty: TEHNOLOŠKI FAKULTET SVEUČILIŠTE U SPLITU
Author: MARTINAC VANJA
Date of defense: 07/08/94
Language: hrvatski
Number of pages: 131
Summary: The proces of isothermal and activated sintering of
magnesiumoxide obtained from sea water, and magnesium oxide p.a. (pro
analysi purity grade) were studied.
The method for rinsing the magnesium hydroxide precipitate wasas also
examined, in order for the boron content in the product to become as low as
posible. Product density, shrinkage and the microstructure of samples
sintered were determined. The effect of TiO2 in the magnesium oxide sample
on the content of B2O3 was also determined. The results were analyzed
mathematically and thermodynamically. Coefficients have been calculated for
associated reactions, namely those for the formation of Ca2B2O5 and CaTiO3.
Keywords: magnesium oxide, magnesium oxide from sea water, substoichiometric precipitation, isothermal sintering of magnesium oxide, effect of TiO2, boron in magnesium oxide, determination of boron, potentiometric method, activated sintering, mathematical interpretation, thermodynamical quantities, phenomenological coefficients
- Type of paper
: Mentorship
Title: A STUDY OF ISOTHERMAL SINTERING OF MAGNESIUM OXIDE
Faculty: TEHNOLOŠKI FAKULTET SVEUČILIŠTE U SPLITU
Mentor: PETRIC NEDJELJKA
Date of defense: 07/08/95
Number of pages: 131
Author: Martinac mr. Vanja
Degree level: Ph.D.
