Öneriler

MOC çimento gerekli hammaddeler olan yüksek saflığa sahip MgCl2 ve MgO üretimi için karbonizasyon aşaması sonunda katı/sıvı ayrımı ile elde edilen çözeltinin sadece Mg²⁺ iyonu içermesi gereklidir. Deneyler sırasında yan ürün olarak elde

edilen ÇKK’ın morfolojik yapısı deney şartlarına göre değişebilmektedir.

Karbonizasyon aşamasında elde edilen ÇKK’ların tamamı kalsit kristalinden oluşması istenirse, deney sonunda elde edilen çözelti Mg²⁺ iyonlarının yanı sıra Na⁺ ve NH₄⁺ gibi iyonlar içerecektir. Bu nedenle, dolomit cevherinden karbonat esaslı sentetik malzeme üretimi hedeflendiği takdirde elde edilen çözeltiden karbonizasyon ile MgCO₃ üretimi ve kalan çözeltiden kontrollü ısıtma ile NaCl ya da NH₄Cl üretimi için çalışmalar gerçekleştirilebilir.

Laboratuvarda mantolu ısıtıcı ile kristalize edilen MgCl2 taneciklerinin beherin çeperlerine yapışmış olması deney sırasında karşılaşılan zorluklardan birisi olmuştur. İstenilen ürün üretilmiş olsa da sprey kurutucu cihazı kullanılarak MgCl2

tanecikleri üretildiğinde aynı problemin yaşanmayacağı ve endüstriye daha uygun bir üretim şekli olacağı düşünülmektedir.

Pirohidroliz ile elde edilen nano boyuttaki MgO taneciklerinin kullanım alanı mikronize boyuttaki MgO taneciklerine göre oldukça fazladır. Elektronik parçalarda, özel seramik malzemelerde, elektrik yalıtım malzemesi üretiminde, kozmetik, parfüm, boya, dolgu, asit/gaz absorbentı olarak kullanılabilmektedir. Ancak, nano boyuttaki MgO taneciklerinin yüzey gerilimleri oldukça yüksek olduğu için aglomere olma eğilimindedirler ve kullanım öncesinde hidrofob özellik kazandırılması gereklidir. Aynı şekilde laboratuvarda da elde ettiğimiz MgO tanecikleri aglomere olmuştur. Bu çalışmada MOC çimento için kullanıldığı için herhangi bir işlem yapılmamıştır. Eğer başka bir alanda kullanılması düşünülürse MgO taneciklerinin aglomere olmadan kalabilmesi için gerekli çalışmaların yapılması önerilmektedir.

Bu çalışmada MOC plakanın ısıl iletkenlik katsayısı katkı maddesi eklenerek 1,202 W/m·K’den 0,6303 W/m·K’e düşürülebilmiştir. Bu değerin daha da düşürülebilmesi için daha yüksek oranlarda katkı maddeleri ilave edilebilir veya özgül ağırlığı ve ısıl iletkenlik katsayısı daha düşük olan katkı maddeleri kullanılarak MOC plaka üretimi konusunda araştırmalar gerçekleştirilebilir.

KAYNAKLAR

AAL, N. A., AL-GHAMDI, A. A., EL-TANTAWY, F., YAKUPHANOGLU, F., and FAROOQ, W. A., 2014. Novel bulk synthesis of magnesium oxide nanobelts networks. Journal of Sol-Gel Science and Technology, 70(1):14-18.

ABALI, Y., BAYCA, S. U., ARISOY, K., and VAIZOGULLAR, A. I. 2011.

Optimization of dolomite ore leaching in hydrochloric acid solutions.

Pysicochemical Problems of Mineral Processing, 46:253-262.

ABDEL-AAL, E.-S. A., 1995. Possibility of utilizing egyptian dolomite ores for production of magnesium oxide by acid leaching. Fizykochemiczne Problemy Mineralugi, 29:55-65.

ACARTÜRK, F., 2009. “Reaksiyon Kinetiği ve Stabilite”. http://www.e-kutuphane.teb.org.tr/pdf/tebakademi/modern_farmasotk/12.pdf (Erişim tarihi:

2 Nisan 2015)

AHN, J. H., CHOI, K. S., KIM, H., YOON, S. H., KIM, J. S., SUNG, G. W., and LEE, K. H., 2000. Synthesis of aragonite by the carbonation process using stainless refining dust in iron&steel plants. (Edited by Paolo Massacci) Proceedings of the XXI International Mineral Processing Congress, Roma, Italy. 29-35.

AKARSU, H., 2004. İçel - Yavca Dolomitlerinden Yüksek İçerikli MgO Üretilmesinin Araştırılması. Ç. Ü. Müh. Mim. Fakültesi – Doktora Tezi, 140 sayfa.

AKARSU, H., and YILDIRIM, M., 2008. Leaching rates of Icel-Yavca dolomite in hydrochloric acid solution. Mineral Processing and Extractive Metallurgy Review, 29(1):42 - 56.

AL-GHAMDI, A. A., AL-HAZMI, F., ALNOWAISER, F., AL-TUWIRQI, R. M., AL-GHAMDI, A. A., ALHARTOMY, O. A., and YAKUPHANOGLU, F., 2012. A new facile synthesis of ultra fine magnesium oxide nanowires and optical properties. Journal of Electroceramics, 29(3):198–203.

AL-HAZMI, F., ALNOWAISER, F., AL-GHAMDI, A., AL-GHAMDI, A. A., ALY, M., AL-TUWIRQI, R. M., and EL-TANTAWY, F., 2012. A new large – Scale synthesis of magnesium oxide nanowires: structural and antibacterial properties. Superlattices and Microstructures, 52(2):200-209.

ALLEY, R. L., and CAINE, G. E., 1991. Magnesium oxychloride cement compositions and methods for manufacture and use. Amerika Birleşik Devletleri, Patent Numarası: US 5004505 A.

ALTMAIER, M., NECK, V., and FANGHÄNEL, T., 2004. Solubility and colloid formation of ThIV in concentrated NaCl and MgCl2 solution. Radiochimica Acta, 92(9-11):537-543.

ALVARADO, E., TORRES-MARTINEZ, L., FUENTES, A., and QUINTANA, P., 2000. Preparation and characterization of MgO powders obtained from different magnesium salts and the mineral dolomite. Polyhedron 19(22-23):2345–2351.

ASTM C1113 / C1113M - 09, 2013. Standard Test Method for Thermal Conductivity of Refractories by Hot Wire (Platinum Resistance Thermometer Technique). Standart, West Conshohocken.

AWWAD, N., and DAIFULLAH, A., 2005. Preconcentration of U(Vl) from aqueous solutions after sorption using sorel's cement in dynamic mode. Journal of Radioanalytical and Nuclear Chemistry, 264(3):623-628.

BABA, A. A., OMIPIDAN, A. O., ADEKOLA, F. A., JOB, O., ALABI, A. G., BARAL, A., and SAMAL, R. 2014. Optimization study of a Nigerian dolomite ore dissolution by hydrochloric acid. Journal of Chemical Technology and Metallurgy, 49(3):280 - 287.

BAKKER, J. S. 2011. The Recovery of Magnesium Oxide and Hydrogen Chloride from Magnesium Chloride Brines and Molten Salt Hydrates. Queen’s University – PhD Thesis, 280 pages.

BALAMURUGAN, S., ASHNA, L., and PARTHIBAN, P., 2014. Synthesis of nanocrystalline MgO particles by combustion followed by annealing method using hexamine as a fuel. Journal of Nanotechnology, 2014:1-7.

BERNER, R., 1974. The role of magnesium in the crystal growth of calcite and aragonite from sea water. Geochimica et Cosmochimica Acta, 39(4):495-504.

BEŞERGİL, B., 2015. Akışkanların depolanması, sanayideki kaplar.

http://www.bayar.edu.tr/besergil/8_akiskanlarin_depolanmasi.pdf (Erişim Tarihi: 20 Nisan 2015).

BİLEN, M., 2010. Çelikhane Curuflarından Liç-Karbonatlaştırma Prosesi İle Kalsiyum Karbonat Kazanılması. Ç. Ü. Müh. Mim. Fakültesi – Yüksek Lisans Tezi, 124 sayfa.

BODINE, M. W., 1976. Magnesium hydroxychloride: A possible pH buffer in marine evaporite brines, Geology, 4(2):76-80.

BOYJOO, Y., P. V., and LIU, J., 2014. Synthesis of micro and nano-sized calcium carbonate particles and their applications. Journal of Materials Chemistry A, 35(2):1-46.

BUSENBERG, E., and PLUMMER, L. N., 1982. The kinetics of dissolution of dolomite in CO2-H2O systems at 1.5 to 65^oC and 0 to 1 atm PCO2. American Journal of Science, 282:34-78.

Calder, B. L., 2003. The Use of Polyphosphates to Maintain Yield and Quality of Whole Cooked, Cryogenically Frozen Lobster Homarus americanus and the Use of Sorbitol and Tocopherol to Maintain Quality of Whole Cooked 125 Cryogenically Frozen Crab Cancer irroratus. The University of Maine – PhD Thesis, 137 pages.

CARMONA, J. G., MORALES, G., FRAILE-SAINZ, J., and RODRIGUEZ, R., 2003. Morphological characteristics and aggregation of calcite crystals obtained by bubbling CO₂ through a CaOH₂ suspension in the presence of additives. Powder Technology, 130(1-3):307-315.

CARMONA, J. G., MORALES, J. G., and CLEMENTE, R. R., 2003.

Rhombohedral–scalenohedral calcite transition produced by adjusting the solution electrical conductivity in the system CaOH2–CO2–H2O. Journal of Colloid and Interface Science, 261(2):434-440.

CHANDRAVAT, M., OJHA, T., and YADAV, R., 2001. Effect of bitumen emulsion on setting,strength, soundness and moisture resistance of oxychloride Cement. Bulletin of Materials Science, 24(3):313-316.

CHAU, C. K., and ZHONG, L., 2008. Microstructures of magnesium oxychloride.

Materials and Structures, 41(5):853-862.

CHEN, J., and XIANG, L., 2009. Controllable synthesis of calcium carbonate polymorphs at different temperatures. Powder Technology, 189(1):64-69.

CHENG, B., LEI, M., YU, J., and ZHAO, X., 2004. Preparation of monodispersed cubic calcium carbonate particles via precipitation reaction. Materials Letters, 58(10):1565-1570.

CHOU, L., GARRELS, R. M., and WOLLAST, R., 1989. Comparative study of the kinetics and mechanisms of dissolution of carbonate minerals. Chemical Geology, 78(3-4):269-282.

CHOWDHURY, A. H., CHOWDHURY, I. H., and NASKAR, M. K., 2015. A facile synthesis of grainy rod-like porous MgO. Material Letters, 158:190-193.

CHUANLIN, H., BIWAN, X., HONGYAN, M., BINMENG, C., and ZONGJIN, L.

2016. Micromechanical investigation of magnesium oxychloride cement paste. Construction and Building Materials, 105:496-502.

CHUANMEI, D. D. 1999. A study on the water resistance of magnesium oxychloride cements improved by the soluble phosphates. Journal of South China Construction University, 2:007.

CIZER, Ö., RODRIGUEZ-NAVARRO, C., RUIZA-AGUDO, E., ELSEN, J., GEMERT, D. V., and BALEN, K. V., 2012. Phase and morphology evolution of calcium carbonate precipitated by carbonation of hydrated lime. Journal of Material Science, 47:6151-6165.

CÖLFEN, H., and LIMIN, Q., 2001. A systematic examination of the morphogenesis of calcium carbonate in the presence of a double-hydrophilic block copolymer. Chemistry A European Journal, 7(1):106-116.

DEHUA, D., and CHUANMEI, Z., 1999. The formation mechanism of the hydrate phases in magnesium oxychloride cement. Cement and Concrete Research, 29:1365-1371.

DENG, D., 2003. The mechanism for soluble phosphates to improve the water resistance of magnesium oxychloride cement. Cement and Concrete Research, 33:1311-1317.

DENG, D., and ZHANG, C., 1996. The effect of aluminate minerals on the phases in magnesium oxychloride cement. Cement and Concrete Research, 26:1203-1211.

DENG, D., and ZHANG, C., 1999. The formation mechanism of the hydrate phases in magnesium oxychloride cement. Cement and Concrete Research, 29:1365-1371.

DING, Y., ZHANG, G., WU, H., HAI, B., WANG, L., and QIAN, Y., 2001.

Nanoscale magnesium hydroxide and magnesium oxide powders: control over size, shape, and structure via hydrothermal synthesis. Chemistry of Materials, 13(2):435-440.

DOMINGO, C., CARMONA, J. G., LOSTE, E., FANOVICH, A., FRAILE, J., and MORALEZ, J. G., 2004. Control of calcium carbonate morphology by precipitation in compressed and supercritical carbon dioxide media. Journal of Crystal Growth, 271(1-2):268-273.

DONG, J., YU, H., and WANG, M., 2015. Influence of fly ash on magnesium oxychloride cement deformation. Materials Science Forum, 817:252-256.

DU, L., WANG, Y., and LUO, G., 2013. In situ preparation of hydrophobic CaCO₃ nanoparticles in a gas-liquid microdispersion process. Particuology, 4(11):421-427.

EBERHART, J. G., and LEVIN, E., 1988. Simplified half-life methods for the analysis of kinetic data. Research Institute for Advanced Computer Science, NASA Ames Research Center, RWCS Technical Report 88.24, 1-8.

EL-MAHLLAWY, M. S., HASSAN, H. A., and KANDEEL, A. M., 2012. The influence of aggregate type on the physico-mechanical properties of magnesia cement pastes. Chemical Engineering Journal, 1(1):4-10.

ERDOGAN, N., YERSEL, E., CELEBI, C., KAVAKLI, N., ve BATAR, T., 2013.

Production of high quality magnesium chloride from recycled waste magnesite powder. Physicochemical Problems of Mineral Processing, 492:557−566.

FALINI, G., FERMANI, S., GAZZANO, M., and RIPAMONTI, A., 1998. Structure and morphology of synthetic magnesium calcite. Journal of Materials Chemistry, 8(4):1061-1065.

FAZHOU, W., LU, Y., LINGYUE, G., and SHUGUANG, H., 2015. Microstructure and properties of cement foams prepared by magnesium oxychloride cement.

Journal of Wuhan University of Technology-Mater. Sci. Ed., 331-337.

FELLNER, P., JURIŠOVÁ, J., and PACH, L., 2011. Preparation of needle-like aragonite particles from calcium nitrate solution. Acta Chimica Slovaca, 4(2):3-10.

FELLNER, P., JURIŠOVÁ, J., KOZÁNKOVÁ, J., and PACH, L., 2012. Preparation of needle—like aragonite particles from calcium nitrate solution in batch and flow reactors. Acta Chimica Slovaca, 5(1):5-11.

FENG, X. P., ZHANG, Z. W., ZHAO, T. T., and WU, Z. P., 2011. Technological study on preparation of calcium carbonate whiskers by using active lime.

Multipurpose Utilization of Mineral Resources, 010.

FEZEI, R., HAMMI, H., and M’NIF, A., 2012. Extractive process for preparing high purity magnesium chloride hexahydrate. Chemical Industry and Chemical Engineering Quarterly, 18(1):83-88.

GAPPAROVA, K. M., KHUDYAKOVA, T. M., VERNER, V. F., and ATANBAYEVA, L. S. 2015. Production of waterproof composite magnesia cement on the basis of local mineral resources. Modern Applied Science, 9(3):309-315.

GASSER, M. S., MORAD, G. H., and ALY, H. F., 2007. Batch kinetics and thermodynamics of chromium ions removal from waste solutions using synthetic adsorbents. Journal of Hazardous Materials, 142(1-2):118-129.

GAUTELIER, M., E. H., O., and SCHOTT, J., 1999. An experimental study of dolomite dissolution rates as a function of pH from -0.5 to 5 and temperature from 25 to 80°C. Chemical Geology, 157:13-26.

GOPI, S., SUBRAMANIAN, V., and PALANISAMY, K., 2013. Aragonite–calcite–

vaterite: a temperature influenced sequential polymorphic transformation of CaCO₃ in the presence of DTPA. Materials Research Bulletin, 48(5):1906-1912.

GUO, H., YU, J., and CHENG, B., 2006. Preparation and formation mechanism of wood-block-like calcite particles. Journal of Solid State Chemistry, 179(8):

2547-2553.

GUO, X. H., YU, S. H., and CAI, G. B., 2006. Crystallization in a mixture of solvents by using a crystal modifier: morphology control in the synthesis of highly monodisperse CaCO3 microspheres. Angew Chem Int Ed., 45(24):3977-3981.

GUO, X., LIU, L., WANG, W., and YU, S.H., 2011. Controlled crystallization of hierarchical and porous calcium carbonate crystals using polypeptide type block copolymer as crystal growth modifier in a mixed solution.

CrystEngComm, 13(6):2054-2061.

GUOZHONG, L., YANZHEN, Y., JIANQUAN, L., YINGZI, W., and HUASHI, L., 2003. Experimental study on urban refuse/magnesium oxychloride cement compound floor. Cement and Concrete Research, 33:1663-1668.

HADIA, N., and MOHAMED, H. A.H., 2015. Characteristics and optical properties of MgO nanowires. Materials Science in Semiconductor Processing, 29:238-244.

HAN, Y. S., HADIKO, G., FUJI, M., and TAKAHASHI, M., 2005. Effect of flow rate and CO₂ content on the phase and morphology of CaCO₃ prepared by bubbling method. Journal of Crystal Growth, 276(3-4):541-548.

HARPER, F. C., 1967. Effect of calcinaton temperature on the properties of magnesium oxides for use in magnesium oxychloride cements. Journal of Applied Chemistry, 17(1):5-10.

HASSAN, S. M. S., AWWARD, N. S., and ABOTERIKA, A.H.A., 2006. Removal of chromium VI from wastewater using sorel’s cement. Journal of Radioanalytical and Nuclear Chemistry, 269(1):135-140.

HERMAN, J. S., and WHITE, W. B., 1984. Dissolution kinetics of dolomite: effects of lithology and fluid flow velocity. Geochimica et Cosmochimica Acta, 49(10):2017-2026.

HERRERA, M. E., 1983. A comparison of critical properties of magnesium oxysulfate and magnesium oxychloride cements as used in sprayed fire resistive. Amerika: American Society for Testing and Materials, DOI:10.1520/STP31895S.

HONGXIA, G., ZHENPING, Q., PENG, Q., PENG, Y., SUPING, C., and WEI, W., 2011. Crystallization of aragonite CaCO3 with complex structures. Advanced Powder Technology, 22(6):777-783.

http://www.physicsclassroom.com/class/thermalP/Lesson-1/Rates-of-Heat-Transfer (Erişim Tarihi: 3 Mart 2015).

IBRAHIM, A., VUNINGOMA, J., HU, X., GONG, Y., HUA, D., HONG, Y., and LI, J., 2012. High-pressure gas-solid carbonation route coupled with a solid ionic liquid for rapid synthesis of rhombohedral calcite. Journal of Supercritical Fluids, 72:78-83.

IMBABI, M. S., CARRIGAN, C., and MCKEANNA, S., 2012. Trends and developments in green cement and concrete technology. International Journal of Sustainable Built Environment, 1(2):194-216.

JIAN, L., TIAN, X., YUNQIN, Z., BIXUE, Z., CHUN, Z., LIPING, Y., and HONGXIU, J., 2010. Study on preparation technology of high-quality precipitated calcium carbonate from calcium slag of phosphogypsum.

Inorganic Chemicals Industry, 017.

JING, W., HONGFA, Y., YING, L., CHENGYOU, W., and JINMEI, D., 2014.

Effects of citric acid on hydration process and mechanical properties of thermal decomposed magnesium oxychloride cement. Journal of Wuhan University of Technology-Mater. Sci. Ed., 29(1):114-118.

JING, W., HONG-FA, Y., YING, L., CHENG-YOU, W., JINMEI, D., and LINA, Z., 2013. Effects of H₃PO₄ and Ca(H₂PO₄)₂ on mechanical properties and water resistance of thermally decomposed magnesium oxychloride cement.

Journal of Central South University of Technology, 20(12):3729−3735.

KAKIZAWA, M., YAMASAKI, A., and YANAGISAWA, Y. 2001. A new CO2

disposal process via artificial weathering of calcium silicate accelerated by acetic acid. Energy, 26(4):341-354.

KANDEEL, A. M., EL-MAHLLAWY, M. S., HASSAN, H. A., SUFE, W. H., and ZEEDAN, S. R., 2012. Effect of type of mixing water and sand on the physico–mechanical properties of magnesia cement masonry units. Housing and Building National Research Center, 8(1):8-13.

KARIMI, Y., and MONSHI, A., 2011. Effect of magnesium chloride concentrations on the properties of magnesium oxychloride cement for nano SiC composite purposes. Ceramics International, 37(7):2405-2410.

KARIMI, Y., and MONSHI, A., 2012. Investigations on the mechanical and hydration properties of sorel cement by changing the concentration of magnesium chloride. Journal of Ceramic Processing Research, 13(6):725-729.

KARTHIKEYAN, N., SATHISHKUMAR, A., and RAJ, W. D., 2014. Effects on setting, strength and water resistance of sorel cement on mixing fly ash as an additive. Int. J. Mech. Eng. and Rob. Res., 3(2):251-256.

KATAYAMA, H., SHIBATA, H., and FUJIWARA, T., 2002. Process for producing aragonite crystal form calcium carbonate with acicular shape. Amerika Birleşik Devletleri, Patent No. 0406662A1.

KATO, T., 2000. Polymer/calcium carbonate layered thin-film composites.

Advenced Materials, 12(20):1543-1549.

KAWALLER, I. S., 1977. Update on magnesium oxychloride fireproofing. Fire Technology, 13(2):139-145.

KIM, J.H., AHN, J.W., LEE, S.B., and KIM, H., 2004. The effect of molar ratio Ca/Al on synthesis of aragonite precipitated calcium carbonate. Geosystem engineering, 7(4):103-106.

Belgede ÇUKUROVA ÜNİVERSİTESİ FEN BİLİMLERİ ENSTİTÜSÜ (sayfa 190-200)