ADSORPTION OF COPPER IONS FROM AQUEOUS SOLUTIONS USING SUNFLOWER HEADS AS AN ADSORBENT
In this paper, the results of changes in pH and conductivity values of the solutions during the rinsing of the adsorbent, as well as during the adsorption of copper ions were presented. Prior to the adsorption experiments, the sunflower heads were rinsed with 200 cm3 of distilled water in ten equal portions (20 cm3 each). After each water volume pa...
By Milan Gorgievski, Nada Štrbac, Velizar Stanković, Vesna Grekulović, Miljan Marković, Dragana Božić
EFFECT OF NANOSILICA ADDITION ON CONCRETE POROSITY AND SORPTIVITY
This paper presents an experimental investigation into the effect of nanosilica addition to porosity and capillary absorption of concrete. Three concrete mixtures 0%, 2%, and 4% nanosilicaby weight of cementweretested.The procedure described in ASTM C642-06 was used to determine the total volume of permeable voids.Water absorption and the rate of w...
By Adnan Mujkanovic, Anesa Ključanin, Marina Jovanović, Amel Zahirović, Amna Karić, Nevzet Merdić
INFLUENCE OF Na2SiO3/NaOH RATIOS ON THE COMPRESSIVE STRENGTH OF FLY ASH BASED GEOPOLYMERS FROM THERMAL POWER PLANT STANARI IN BIH
In this paper, the influence of Na2SiO3 /NaOH ratio on the compressive strength of fly ash - based geopolymers was tested. The fly ash from thermal power plant Stanari near Doboj, BiH is used.The ratio of alkali activator to fly ash (AA / FA ratio) was constant in all samples and it was 0.8. A 12M NaOH solution was used. The heat treatment temperat...
By Nadira Bušatlić, Ilhan Bušatlić, Nevzet Merdić, Dženana Smajić-Terzić
TOXICOLOGICAL ASPECTS OF FOOD PAPER PACKING
Mostly used food packing are: paper, cartoon, plastics, glass, metals and multilayer materials. The plastics and paper/cartoon make about 70% of all food packing. These two have the biggest migration potential. The use of plastics is regulated by specific EU rules, but it is not yet the same about the use of paper packing. In order to ensure health...
By Benjamin Muhamedbegović, Midhat Jašić, Marizela Šabanović, Faik Uzunović
THE QUALITY OF THE PULP WASHING PRODUCED BY THE SULPHATE PROCESS IN THE CELLULOSE AND PAPER FACTORY "NATRON HAYAT", MAGLAJ
The process of the pulp washing is very important both economically and environmentally, since the quality of cellulose washing is directly related to the efficiency of chemical regeneration and the quality of the wastewater generated. The purpose of the cellulose fiber washing process is to economically remove the maximum of soluble organic and so...
By Azra Halilović, Ilhan Bušatlić, Šefkija Botonjić, Amna Karić
INVESTIGATION THE POSSIBILITY OF POZZOLANIC CEMENT CEM IV 42,5N PRODUCTION IN CEMENT PLANT KAKANJ
This paper presents an experimental study to evaluate the possibility of CEM IV 42,5N producing by increasing the specific cement surface from 3180 to 3850 cm2 /g. In this paper, fly ash is used as a cement admixture because fly ash possesses both hydraulic and pozzolanic properties. If one part of the clinker, as a major cement admixture, is repla...
By Nevzet Merdić, Nedžad Haračić, Ilhan Bušatlić, Nadira Bušatlić, Amna Karić
METALOGRAPHY IN BOSNIA AND HERZEGOVINA BEFORE 30 YEARS AND TODAY
In modern times, the science of materials cannot be imagined without metallography. The history of metallographic testing in Bosnia and Herzegovina is primarily related to Zenica. Today, most of the research related to the metal industry in BiH is conducted in laboratories at the Kemal Kapetanović Institute in Zenica. The Institute's Metallog...
By Belma Fakić, Adisa Burić, Edib Horoz
SOME ASPECTS IN THE IMPROVEMENT PROCESSES OF I-BEAMS PRODUCTION
Some specific aspects in the improvement processes related to I-beams production, especially related to the conversion of classical to the universal rolling mills stands are presented in this paper. One of practical solutions in the a.m. conversion is described in some more details, as well as some of better designs in the variety of I-beams, conce...
By Faik Uzunović, Omer Beganović, Lamija Sušić
CONTEMPORARY MATERIALS FOR HEAT HARVESTING
In this paper, we have introduced new contemporary materials for heat harvesting, based on thermoelectric effect (or Seebeck effect): rear earth mono-pnictides and graphene. Measure of effectiveness for transformation of heat to electricity is represented with zT factor, which measure heat harvesting potential. zT factor is related with heat and el...
By Siniša M. Vučenović, Jovan P. Šetrajčić, Steva K. Jaćimovski
CHAMOTTE REFRACTORY CASTABLE PROPERTIES ENHANCING BY OPTIMIZING PARTICLE SIZE DISTRIBUTION
The paper examined the changes in properties of conventional castables composed of a mixture of calcium-aluminate cement and chamotte caused by changes in the particle size distribution. Properties of castable with 20 % cement and „as received“ chamotte were compared with castableofparticle size distribution adapted to the calculated di...
By Marina Jovanović, Adnan Mujkanovic