- Type of paper
: Paper in journal
Title: ENVIRONMENT PROTECTION ON DALMACIJACEMENT ROTARY KILNS
- Authors:
- Radić, Ivan (147413)
Journal: Privreda Dalmacije
Number: 7
Volume: 28
Year: 1991
Pages: from 53 to 57
Number of references: 8
Language: hrvatski
Summary: Normal human life and work conditions include implicity
that
noise, vibrations, toxic substances, radiation etc. must be
limited. If these limits are overcome the new dinamic balance
between needs for development and the needs for environment
protection have to be established.
Since cement factories are supplied with dust precipitators
enabling to keep dust emission under 100-130 mg/Nm3 of exit
gases, it obliges cement producers at the same time to meet
these requirements.
It is encouraging that dust samples from Dalmacijacement
plants do not contain free silicon dioxide.
Keywords: ecology,toxic,radiation,environment protection,cement,dust,precipitators,emission
- Type of paper
: Paper in journal
Title: NITROGEN OXIDES IN THE SYSTEM OF CEMENT ROTARY KILN
- Authors:
- Radić, Ivan (147413)
Journal: Zaštita atmosfere
Number: 2
Volume: 19
Year: 1991
Pages: from 75 to 79
Number of references: 15
Language: hrvatski
Summary: Since nitrogen oxides are toxic and harmful for the
human
health and environment, the great attention is beeing paid to
their forming, to the reactions at the temperatures over
1600oC and to the reactions below 900oC.
Due to the primary and secondary aier, as well as to the
combustion conditions the content of NOX in kiln gases can be
high and variable.
Measurement of NOX concetrations is complex, and the emission
limits for newer plants lie between 1.3 and 1.8 g NO2/Nm3 of
exit gases.
Keywords: Nitrogen oxides, rotary kiln, combustion temperature, exit gases, emission, humen environment, health protection, fuel, raw material
- Type of paper
: Paper in journal
Title: EMISSION OF DUST AND SO2 IN THE CEMENT INDUSTRY
- Authors:
- Radić, Ivan (147413)
Journal: Kemija u industriji
Number: 5
Volume: 40
Year: 1991
Pages: from 191 to 195
Number of references: 14
Language: hrvatski
Summary: Long time ago it was thought that the cement plant,
by
emission of dust into the environment, is a mass air polutant.
Dust particles are considerably bigger than smoke particlcs
and, therefore, settle down faster and disappear from the
atmosphere. By improvement of dedusting devices and modified
fuel combustion methods, the quantity of exhausted dust, in
continual cement plant operation, can be kept under 50 mg Nm-
3. Emission of sulphur dioxide occurs when the quantity of
volatile sulphur compounds in a rotary kiln system exceeds
the quantity of sulphur that can be bound to newly formed
compounds.
Keywords: dust, sulphur dioxide, cement industry, rotary kiln, environment protection, pollutant, exit gases, emission, regulations.
- Type of paper
: Paper in journal
Title: SULPHUR DIOXIDE IN THE ROTARY KILN SYSTEM
- Authors:
- Radić, Ivan (147413)
Journal: Zaštita atmosfere
Number: 1
Volume: 20
Year: 1992
Pages: from 10 to 14
Number of references: 11
Language: hrvatski
Summary: Emission of sulphur dioxide occurs when the amount
of
evaporable sulphur compounds is greater than it can be
incorporated in clinker minerals. It is necessary to know in
advance the chemical composition of all components taking part
in the process since the reactions depend on materials used.
According to the regulations of most countries the emission
should not exceed 400 mg SO2/Nm3.
Energy saving and preserving of human environment can be
economically achieved by the controlling technological process
of cement clinker burning.
Keywords: sulphur dioxide, burning, rotary kiln, cement clinker, emission,fuel, raw material, energy saving, human environment health protection.
- Type of paper
: Paper in journal
Title: THERMAL TREATMENT OF MUNICIPAL WASTE IN CEMENT INDUSTRY
- Authors:
- Radić, Ivan (147413)
Journal: Gospodarstvo i okoliš
Number: 5
Volume: 1
Year: 1993
Pages: from 338 to 343
Number of references: 9
Language: hrvatski
Summary: Municipal waste is a mix of different materials
which
affecting each other increase their negative impact on the
environment. Diminishing of waste generating by improvement
production technology is the basic factor influencing human
and environmental health.
Waste incineration at relatively lower temperatures is
dangerous because of the emission of harmfull matters. Using
high temperature tretment generating of waste residues is
minimized as well as environment pollution and only unharmful
part of the waste remains permanently deposited.
Keywords: municipal waste, cement industry, management environment protection, human health, emission, harmful matter.
- Type of paper
: Paper in journal
Title: A NEW APPROACH IN EVALUATION OF FILLER EFFECT IN CEMENT
I. EFFECT ON STRENGTH AND WORKABILITY OF MORTAR AND CONCRETE
- Authors:
- Krstulović, Petar (70770)
- Kamenić, Nevenka (20024)
- Popović, Krešimir (73141)
Journal: Cement and Concrete Research
Volume: 24
Year: 1994
Pages: from 0 to 0
Number of references: 16
Language: engleski
Summary: The mortar and concrete specimens of equal bulk model
were
tested. Under this condition, their properties depend on the
composition of cementitious powder only. The influence of all
other components and parameters is this excluded.
The test results of the compressive strength were evaluated
statistically. The results suggest that a linear relationship
exists between compressive strength and volumetric
concentration of filler in the cementitious componenet. The
relationship depends on the parameters of the bulk model and
the composition of aggregate.
Keywords: filler, portland cement, limestone, mortar, concrete, strength, workability, bulk moedel, statistical evaluation
- Type of paper
: Paper in journal
Title: A NEW APPROACH IN EVALUATION OF FILLER EFFECT IN CEMENT
II. THE EFFECT OF FILLER FINENESS AND BLENDING PROCEDURE
- Authors:
- Krstulović, Petar (70770)
- Kamenić, Nevenka (20024)
- Popović, Krešimir (73141)
Journal: Cement and Concrete Research
Volume: 24
Year: 1994
Pages: from 0 to 0
Number of references: 6
Language: engleski
Summary: A method for determination of filler and clinker grading
in
the cement composite has been developed. The term efficiency
is introduced to evaluate the effect of filler content,
fineness and blending procedure on the mortar and concrete
strength.
Statistical evaluation showed that addition of small
quantities of fine filler improves the efficiency of portland
cement. The intimacy of mixing with clinker particles, such as
during intergrinding of filler and cement, is a decisive
factor for this positive effect.
Keywords: filler, cement, efficiency, grading, fineness, blending, mortar, concrete, strength, workability
- Type of paper
: Paper in journal
Title: FORMATION AND EMISSION OF SO2 IN CEMENT KILNS
- Authors:
- Radić, Ivan (147413)
Journal: Gospodarstvo i okoliš
Number: 2
Year: 1994
Pages: from 186 to 189
Language: hrvatski
Summary: Sulphur dioxide emission in cement plants can be caused by
the use of natural raw materials, secondary raw materials (wastes) and
fuels containing different sulphur composites. If the total amount of
sulphur present is greater than it can be incorporatod in portland cement,
minerals the excess will be emited through the kiln chimney. Therefore it
is necessary to know the chemical composition of all components taking part
in cement burning process. Depending on that the emission of sulphur
dioxide differs for various plants. The total emission of SO2 into the
atmosphere must not exceed 400 mg/Nm3.
Keywords: sulphur dioxide,emission,clinker burning,cement,raw material,waste,environment
- Type of paper
: Paper in journal
Title: POSSIBILITY OF FORMATION AND REDUCTION OF NOx OXIDES
DURING PORTLAND CLINKER PRODUCING
- Authors:
- Radić, Ivan (147413)
Journal: Gospodarstvo i okoliš
Number: 3
Year: 1995
Pages: from 20 to 24
Language: hrvatski
Summary: In the last twenty years it has been started to research
the forming, the emission and possibility of reduction of the nitric oxides
in the rotary kiln system for the Portland clinker. As the nitric oxides
are toxic and affect harmfully to the environment and in bigger
concentrations to the human health, a great attention has been payed to
arising of them from the fuel that contains nitric oxides to the termic
reactions at the temperatures above 1600oC as well as to the reactions at
temperatures below 900oC. It has been done enough in the field of reduction
of nitric oxides in the exhaust gases (Xeller burner and Rotaflam burner)
and the future researches will prove it.
Keywords: nitrogen oxide,emission,rotary kiln,cement,environment,health,toxic
- Type of paper
: Paper in journal
Title: SLOBODNI CaO U SISTEMU CaO-SiO2-Al2O3-Fe2O3-MgO-K2O-Na2O
NAKON SINTROVANJA KOD RAZLIČITIH TEMPERATURA
- Authors:
- Radić, Ivan (147413)
Number: 48
Year: 1995
Pages: from 394 to 400
Language: njemački
Summary: The object of the investigations was to study the influence
of alkalis on the quantity and crystal size of free CaO in cement clinker.
Cement clinker samples made from an industrial cement raw meal, without and
with the addition of 2.0 wt.% Na2O and 2.0 wt.% K2O, were burnt in a
laboratory furnace at 1300, 1380 and 1450oC and then cooled rapidly in air
or slowly in the furnace. The content and crystal size distribution of the
free CaO in polished and etched sections of the clinker samples were
determined by microscope. The main result was that the addition of alkalis
substantially increases the content of free CaO. There is also a
significant increase in the crystal size of the free CaO, which impedes its
further reaction.
Keywords: free CaO,sintering,cement,crystal,microscopy, alkalis,size,distribution
- Type of paper
: Paper in proceedings
Title: TECHNICAL EXPERIENCE IN THE USE OF INDUSTRIAL WASTE FOR
BUILDING MATERIALS PRODUCTION AND ENVIRONMENTAL IMPACT
- Authors:
- Popović, Krešimir (73141)
- Kamenić, Nevenka (20024)
- Kovač, Jadranka (60212)
- Cesar, D. (112206)
- Editors
- Goumans, J.J.J.M.
Proceedings title: Waste Materials in Construction
Language: engleski
Place: Amsterdam, Nizozemska
Year: 1991
Pages: from 479 to 490
Meeting: WASCON 91
Held: from 11/10/91 to 11/14/91
Summary: This paper gives a short presentation of some
specific
characteristics and long term experience in practical use of
waste materials for cement production, together with the
results of the first attempt to determine heavy metals content
and their leaching from slag, ash and mortars. This will serve
to compare the health hazard caused by fly ash and slag
addition to portland cement with those of conventional bulding
materials.
Keywords: industrial waste, building materials, portland cement, mineral admixture, environment protection, health hazzard, leaching, radioactivity.
- Type of paper
: Paper in proceedings
Title: THE EXPIRIENCE IN QUALITY CONTROL AND QUALITY ASSURANCE OF
CEMENT
- Authors:
- Kamenić, Nevenka (20024)
- Pavlović, Đurđica
- Popović, Krešimir (73141)
- Editors
- Radić, Jure
Proceedings title: Graditelji u obnovi Hrvatske , Zbornik II
Language: hrvatski
Place: Zagreb
Year: 1992
Pages: from 189 to 194
Meeting: Radni sabor Graditelji u obnovi Hrvatske
Held: from 06/25/92 to 06/27/92
Summary: The paper gives a brief presentation of the quality
control
and quality assurance system of the cement production in
Croatia. Data recording of characteristic cement parameters
determination and the statistical evaluation of the strength
results are demonstrated.
The authors suggest to the designers and contractors to use
the available files when choosing the cement for particular
projects.
Keywords: quality assurance, cement production, statistical evaluation, strength.
- Type of paper
: Paper in proceedings
Title: FORMING AND INFLUENCE OF THE NITROGEN OXIDES IN THE CEMENT
INDUSTRY
- Authors:
- Radić, Ivan (147413)
Proceedings title: Zbornik radova
Language: hrvatski
Place: Zagreb
Year: 1992
Pages: from 408 to 412
Meeting: 37. međunarodni skup KOREMA
Summary: As the NOX-oxides are toxic and affect harmful by to
the
environment and in bigger concentrations to health of people,
a great attention has been payed to arising of them, to the
thermic reactions at the temperatures above 1600oC, as wel as
to the reactions at the temperatures below 900oC from the fuel
that contains nitric compounds.
The measurement of the NOX-oxides concentration is a very
complex process, and the limit values for the new plants allow
from 1,3 to 1,8 g NO2/Nm3 of gas. The quantity of nitric
oxides offers a lot of valuable information about the state in
the rotary kiln if we take into consideration the burning
system, the surplus of air and the composition of fuel.
Keywords: emission, nitric oxides, rotary kiln, portland cement, toxic, harmful, environment, thermic reactions, fuel.
- Type of paper
: Paper in proceedings
Title: EMISSION AND INCORPORATION OF HEAVY METALS IN CEMENT
- Authors:
- Radić, Ivan (147413)
- Editors
- Grisogono, P.
Proceedings title: Zbornik radova
Language: hrvatski
Place: Zagreb
Year: 1992
Pages: from 243 to 256
Meeting: XV SAVJETOVANJE O TEHNIČKIM DOSTIGNUĆIMA I EKOLOŠKIMRJEŠENJIMA U PROIZVODNJI CEMENTA I AZBEST-VLAKNO CEMENTA
Held: from 11/05/92 to 11/07/92
Summary: With the development of analytical scienccs for
the
determination of the smallest quantities of substances, in the
course of the last ten years it has been proved that exist
gases from the rotary kiln for portland clinker can contain
heavy metals.
The greatest part of the heavy metals from raw meal components
or technological fuel is included into clinker minerals during
sintering, and only a smaller part leaves by the emission of
dust and vapours into the environment.
Keywords: analytical chemistry, rotary kiln, portland clinker, heavy metals, raw meal, fuel, emission, dust, environment.
- Type of paper
: Paper in proceedings
Title: THE NEW EUROPEN STANDARD FOR CEMENT
- Authors:
- Popović, Krešimir (73141)
- Kamenić, Nevenka (20024)
- Editors
- Radić, Jure
Proceedings title: Graditelji u obnovi Hrvatske, Zbornik
Language: hrvatski
Place: Zagreb
Year: 1993
Pages: from 167 to 171
Meeting: Radni sabor Graditelji u obnovi Hrvatske
Held: from 10/13/93 to 10/15/93
Summary: The paper gives brief information on making the European
pre-
standard for common cement ENV 197-1. Composition of cement
components, requirements regarding chemical, physical and
mechanical characteristics as well as conformity criteria are
described. Differences in these features between standard
existing in Croatia and pre-standard ENV 197-1 are pointed
out.
An intensive activity in the field of harmonizing national
standards with ENV 197-1 and /or adoption of European pre-
standard is expected in coming 3 to 5 years. In the meantime
the pre-standard will operate in parallel with existing
national standards.
Keywords: European prestandard, cement, composition, quality para, eter, conformity, harmoniying.
- Type of paper
: Paper in proceedings
Title: SIMULATION THE CONFORMITY ASSESSING OF CEMENT QUALITY
ACCORDING EUROPEAN PRE-STANDARD
- Authors:
- Kamenić, Nevenka (20024)
- Popović, Krešimir (73141)
- Pavlović, Đurđica
- Editors
- Radić, Jure
Proceedings title: Graditelji u obnovi Hrvatske, Zbornik
Language: hrvatski
Place: Zagreb
Year: 1993
Pages: from 175 to 180
Meeting: Radni sabor Graditelji u obnovi Hrvatske
Held: from 10/13/93 to 10/15/93
Summary: The adoption of the European pre-standard for common cement
is
expected in Croatia in coming years. It specifies different
procedure in assessing the conformity of cement to the quality
requirements than the regulations valid in Croatia now. The
paper explains in short the conformity procedure for cement
strength and presents the simulation of conformity assessment,
using the results of strength determination during last two
years in comparison with 5 % lower strength data expected when
the new standard sand will be used.
Keywords: european standard, cement quality assurance, certification, standard sand, simulation, strength.
- Type of paper
: Paper in proceedings
Title: THE REDUCTION NOx OXIDES WITH PRINCIPAL BURNER
- Authors:
- Radić, Ivan (147413)
- Editors
- Žižić, Petar
Language: hrvatski
Place: Split
Year: 1995
Pages: from IV-19 to IV-26
Meeting: 16. savjetovanje o tehnološkim dostignućima i ekološkim rješenjima u proizvodnji cementa i vlakno-cementnih proizvoda
Held: from 03/09/95 to 03/10/95
Summary: The nitric oxides are toxic and affect harmfully to the
environment and a great attention has been payed to arising of them and
possibility of reduction. They are formed in the termic reactions at the
temperatures above 1600oC at the temperatures below 900oC from the fuel
that contains nitric oxides. It has been done enough in the field of
reduction of nitric oxides in the exhaust gases from rotary kiln make use
of Xeller burner and Rotaflam burner.
Keywords: nitrogen oxides,toxic,environment,thermic reaction, exit gases, rotary kiln,burner
- Type of paper
: Paper in proceedings
Title: STRENGTH DEVELOPMENT AND FINAL STRENGTH OF CEMENTS
PRODUCED IN CROATIA
- Authors:
- Kamenić, Nevenka (20024)
- Pavlović, Đurđica
- Popović, Krešimir (73141)
- Editors
- Žižić, Petar
Language: hrvatski
Place: Split
Year: 1995
Pages: from VI-31 to VI-36
Meeting: 16. savjetovanje o tehnološkim dostignućima i ekološkim rješenjima u proizvodnji cementa i vlakno-cementnih proizvoda
Held: from 03/09/95 to 03/10/95
Summary: The main quality parameters of cements produced during one
year in Croatia are presented and compared in the paper. For data
considering methods of mathematical statistic were applied. The strengths
developed by cement in the first 24 hours of hydration are given as well.
Compressive strengths of cements after 3 and 28 days of strengthening do
not differ significantly, while the cements from various plants develop
very different strengths in terms up to 24 hours.
Keywords: strength,cement,quality,statistics
- Type of paper
: Paper in proceedings
Title: DISPOSAL OF WASTE OILS
- Authors:
- Radić, Ivan (147413)
- Editors
- Žižić, Petar
Language: hrvatski
Place: Split
Year: 1995
Pages: from IV-13 to IV-18
Meeting: 16. savjetovanje o tehnološkim dostignućima i ekološkim rješenjima u proizvodnji cementa i vlakno-cementnih proizvoda
Held: from 03/09/95 to 03/10/95
Summary: The production of industrial and motor oils is constantly
increasing; consenquently the quantity of waste oils is increasing, too. A
big problem arises from the nature of oils and possibility of environment
pollution. In Europe, waste oils are mostly regenerated or collected
selectively for use as fuel. In our country the actual situation is not
favorable and we will have to organize collecting and use as fuel of waste
oil, in thermal power plants or cement industry.
Keywords: waste oils,pollution,regeneration,fuel,power plant,cement factory, environment
- Type of paper
: Summary in proceedings
Title: EVALUATION OF MILL OPERATION UNIFORMITY AND CONFORMITY OF
RESULTS OBTAINED BY PARALLEL FINENESS TESTING
- Authors:
- Kamenić, Nevenka (20024)
- Pavlović, Đurđica
- Popović, Krešimir (73141)
- Editors
- Božičević, Juraj
Proceedings title: Od uzorka do podataka i informacije, Zbornik sažetaka radova
Language: hrvatski
Place: Zagreb
Year: 1993
Pages: from 88 to 0
Meeting: Od uzorka do podatka i informacije Međunarodno znanstveno savjetovanje
Held: from 10/20/93 to 10/23/93
Summary: The following grinding fineness values, considered as
typical
parameters for mill operation, were monitored during a pilot
industrial production of high early strength cements:
- streams of ground material at the air separator exit,
- dust from electrostatic precipitator,
- final mix to be transported to the cement silo.
The results obtained by frequent sampling and determination of
specific surface for the three above mentioned sample types
were used to evaluate the efficiency of the grinding process
and the stability of mill segments during a period of several
hours. Different results obtained by parallel testing of
specific surface in two laboratories were also monitored.
Mathematical statistic methods were applied in the data
analysis and evaluation.
Keywords: ball mill, grinding, cement, fineness, air separator, electrostatic precipitator, specific surface, statistical evaluation
- Type of paper
: Summary in proceedings
Title: POSSIBILITIES OF DATA BASE APPLICATION AT CEMENT TESTING
- Authors:
- Popović, Krešimir (73141)
- Kamenić, Nevenka (20024)
- Pavlović, Đurđica
- Editors
- Božičević, Juraj
Proceedings title: Od uzorka do podatka i informacije, Zbornik sažetaka
Language: hrvatski
Place: Zagreb
Year: 1993
Pages: from 100 to 0
Meeting: Od uzorka do podatka i informacije Međunarodno znanstveno savjetovanje
Held: from 10/20/93 to 10/23/93
Summary: From data about characteristic cement parameters,
statistic
processing and the result evaluation it is possible to perform
various analyses that offer a complex evaluation of the use
value of cement. These data may help the cement users to
choose the right material for their specific needs. They also
contain advantages and deficiencies of the valid system of
quality control for cement . There is also an explanation of
parameter treatments (e.g. water for standard consistency,
specific surface) significant for the quality of cement or
concrete
Keywords: statistic, processing, data base, quality control, quality assurance, characteristic parameter, cement, certification, concrete.
- Type of paper
: Summary in proceedings
Title: COMPUTER ANALYSIS OF CEMENT PROPERTIES FOR CERTIFICATION
PURPOSES
- Authors:
- Kamenić, Nevenka (20024)
- Pavlović, Đurđica
- Mikulić, Dunja (89455)
- Editors
- Božičević, Juraj
Proceedings title: Od uzorka do podatka i informacije, Zbornik sažetaka
Language: hrvatski
Place: Zagreb
Year: 1993
Pages: from 90 to 0
Meeting: Od uzorka do podatka i informacije Međunarodno znanstveno savjetovanje
Held: from 10/20/93 to 10/23/93
Summary: Considering a great technical significance of cement
and
numerous possibilities of its application, its properties have
strictly been defined by appropriate standards. The cement
samples taken at random in the course of production are
statistically analyzed. The data are PC-processed because of a
large amount of information obtained by testing in both
laboratories, and the necessity of a repeated use of the data.
An appropriate software is used to correlate the cement type
and the manufacturer-related information with standard
requirements, and to verify both the results obtained, and the
set criteria.
Keywords: certification,personal computer, cement, standard, Quality control, quality assurance, strength, criteria, random sample.
