Production of precipitated calcium carbonate from marble wastes

Download
index.pdf
2013
Sezer, Nurettin
Show full item record
404
views
222
downloads
The aim of this study was to investigate the production of precipitated calcium carbonate from marble wastes. Limestone is used as the source for the production of precipitated calcium carbonate. Marble wastes primarily constitute of CaCO3. As the major content of the marble waste and limestone are the same, marble wastes can be used as an alternative source for the production of precipitated calcium carbonate. By this way, both the adverse environmental effects of marble wastes can be prevented and the wastes can be used as a cheaper source for precipitated calcium carbonate manufacturing industry. Waste samples were dissolved in pure water in an autoclave of 1 liter capacity by addition of CO2 gas. Contained aqueous carbonates were precipitated by evaporation of the CO2 in the solution. Concentration of dissolved carbonate species was examined for each test. Microstructure of the marble wastes used in the experiments and the precipitated calcium carbonate obtained from the experiments was investigated by Scanning Electron Microscopy, and their chemical analyses were carried out. The results of the chemical analysis were comparatively evaluated. The studies revealed that the precipitated calcium carbonate can be produced from marble wastes. By the experimental studies, the required conditions for production have been determined. In general, the experimental results in different conditions revealed that high CO2 pressure, lower ambient temperature and high stirring speed had positive effect in the dissolution of waste samples. The best result was obtained as 4.73 g/L dissolved CaCO3 under the conditions of -250 +106 µm particle size, 1400 rpm stirring speed, at 2 h, 8 °C and 10 atm CO2 pressure. The study recommends marble wastes as an alternative resource to manufacture precipitated calcium carbonate with sufficient quality to meet the industrial requirements.
Marble., Calcium carbonate., Limestone.
http://etd.lib.metu.edu.tr/upload/12616347/index.pdf
https://hdl.handle.net/11511/22946
Graduate School of Natural and Applied Sciences, Thesis

Suggestions

Influences of three different ethylene copolymers on the toughness and other properties of polylactide
MEYVA, YELDA; Kaynak, Cevdet (Informa UK Limited, 2016-01-01)
The aim of this study was to investigate influences of three different ethylene copolymers on the toughness and other properties of very brittle biopolymer PLA (polylactide). For this aim, PLA was melt blended by twin-screw extruder with various amounts of ethylene vinyl acetate (EVA), ethylene-methyl-acrylate (EMA) and ethylene-n-butyl acrylate-glycidyl-methacrylate (EBA-GMA). SEM and DSC analyses indicated that these ethylene copolymers were thermodynamically immiscible with phase separation in the form o...
Effect of seeding on the properties of mfi type zeolite membranes
Dinçer, Eser; Kalıpçılar, Halil; Department of Chemical Engineering (2005)
The effect of seeding on the properties of alumina supported MFI membranes was investigated in this study. Membranes were synthesized from clear solutions with a molar batch composition of TPAOH:9.80SiO2:0.025NaOH:0.019Al2O3: 602.27H2O:39.16C2H5OH on bare and seeded alumina supports at 130oC in autoclaves. The amount of seed on the support surface was changed between 0.6 mg/cm2 and 6.9 mg/cm2 by vacuum seeding method, which provided uniform and closely packed seed layers. Membranes were characterized by XRD...
Production of high carbon ferromanganese from a manganese ore located in Erzincan
Çardaklı, İsmail Seçkin; Sevinç, Naci; Öztürk, Tayfur; Department of Metallurgical and Materials Engineering (2010)
Main purpose of this study was to investigate the production of high carbon ferromanganese by smelting a manganese ore located in Erzincan. Time, charge basicity, fluorspar addition and coke to ore weight ratio were used as experimental variables. After characterization of the ore, a mixture of 100 grams of uncalcined manganese ore and carefully weighed amounts of coke powder, lime, fluorspar and scrap iron were put into a conical graphite crucible. The graphite crucible with its contents was covered with a...
Utilization of clay minerals in wastewater treatment: Organic matter removal with kaolinite
Hascakir, Berna; DÖLGEN, DENİZ (2008-01-01)
The aim of presented study is the investigation of clay minerals utilization in the wastewater treatment. The chemical treatability studies were carried out by the refined packing type kaolinite (hydrate aluminum silicate). By testing kaolinite as coagulant and flocculant separately within the experimental studies, optimum doses were determined, and on the basis of treatment efficiencies, results were compared with the chemicals such as alum, lime and ferric chloride which are widely used. The removal of or...
TREATMENT OF EFFLUENTS FROM HEMP-BASED PULP AND PAPER-INDUSTRY .1. WASTE CHARACTERIZATION AND PHYSICOCHEMICAL TREATABILITY
Dilek, Filiz Bengü (1994-01-01)
This study was conducted to determine the wastewater characteristics as well as the treatment alternatives for the Tafkopru Pulp and Paper Mill in Turkey. The physico-chemical treatability study was conducted by standard Jar-test equipment. The highest COD removal efficiency obtained was 96% for the paper machine, 50% for the alkali extraction and 20% for the bleaching effluents by using alum as coagulant. The colour removal efficiency was around 80% for the alkali extraction effluents.
Citation Formats
N. Sezer, “Production of precipitated calcium carbonate from marble wastes,” M.S. - Master of Science, Middle East Technical University, 2013.
METU IIS - Integrated Information Service open@metu.edu.tr