This study was carried out with Beypazari trona ore having a grade about 85 % trona (Na2CO3.NaHCO3.2H2O). The main target of the study is the
determination of calcinations and leaching parameters, which are the two main unit operations in the production of soda ash (Na2CO3) from trona ore.
Calcination parameters / calcination duration, calcination temperature and
particle size were determined by using three different heat treatment systems,
namely laboratory type muffle furnace, up draught furnace and microwave oven.
As an alternative, wet type microwave-induced calcination which completes the
decomposition of trona in solution was also investigated. Thirty minutes of
calcination time was sufficient for complete calcination of & / #8211 / 6.35 mm trona
sample at 175 ° / C with the muffle furnace. Calcination of trona with microwave
treatment was completed in a shorter time. The nature of thermal reactions and
structural changes of trona during calcination were elucidated by TG
(Thermogravimetry), DTG (Derivative Thermogravimetry), SEM (Scanning
Electron Microscope) and XRD (X-ray diffraction) analysis. The effect of heat
treatment on grindability, specific surface area and decrepitation of trona were
also investigated. In the last stage of the study, leaching parameters / leaching
time, leaching temperature and pulp density were determined for both
uncalcined and calcined samples. 80 % leach recovery was obtained in 4
minutes for & / #8211 / 6.35 mm particle size of uncalcined sample in 25 % pulp density
while 100 % leach recovery was reached for the calcined samples under the
same conditions.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/663526/index.pdf |
| Date | 01 January 2003 |
| Creators | Orgul, Sibel |
| Contributors | Atalay, Umit |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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