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Register a new userContribution to the characterization of pyrite ore in Tartous Governorate, and a study of some factors affecting its dissolution
مساهمة في توصيف خام البيريت في محافظة طرطوس ودراسة بعض العوامل المؤثرة على إنحلاليته
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Added by
Tishreen University ورقة بحثية
Publication date
2020
fields
Chemistry
and research's language is
العربية
Created by
Ali Zhairy
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تم في هذا البحث توصيف خام البيريت الطبيعي الموجود في محافظة طرطوس عن طريق دراسة العينتين المأخوذتين من موقع حصن سليمان- صافيتا (A) ومنطقة القدموس (B), بالإضافة إلى دراسة الشروط المثلى لإنحلالية البيريت (درجة pH – الزمن –الكمية) بالشروط الهوائية. أوضحت نتائج إنعراج الأشعة السينية (XRD) أن العينة (A) مؤلفة بشكل رئيس من فلز البيريت ولاتحوي شوائب, بينما العينة (B) مؤلفة من فلز البيريت المترافق مع فلز الكالسيت بنسبة قليلة, وقد تم تأكيد هذه النتائج بواسطة مطيافية الأشعة تحت الحمراء (FTIR) والمجهر الاستقطابي (PLM). كما تراوحت نسبة الحديد في العينتين (BوA) بين (42.6 - 43 %) ونسبة الكبريت بين (40 - 53.7 %). بالنسبة لإنحلالية البيريت, أظهرت النتائج أن البيريت المأخوذ من حصن سليمان (A) يبدأ بالانحلال عند قيم pH أقل من 4,5, وزمن التماس حوالي 6 ساعات. وبمقارنة نتائج العينة (A) مع العينة (B) نجد أن إنحلالية العينة (A) كانت أقل بحوالي ثلاث أضعاف من انحلالية العينة (B) وذلك يعزى إلى أن العينة (A) تحوي خام بيريت نقي ومتبلور بشكل جيد بينما العينة (B) تحوي خام بيريت غير نقي ومترافق مع الكالسيت الذي يزيد من سرعة إنحلاليته.
In this research, the natural pyrite ore found in Tartous Governorate was described by studying the two samples taken from Hosn Suleiman -Safita (A) and Al Qadmous (B) area, in addition to studying the optimum conditions for pyrite dissolution (pH - time - quantity) with aerobic conditions. The results of X-ray diffraction (XRD) showed that the sample (A) is mainly composed of pyrite mineral and does not contain impurities, while sample (B) is composed of pyrite mineral combined with a small amount of calcite mineral, and these results were confirmed by the result of (FTIR) infrared spectroscopy and Polarised light microscopy (PLM(. The iron percentage in the two samples (A,B) is ranged between (42.6 – 43 %) and the sulfur percentage is between (40 – 53.7 %). With regard to pyrite dissolution, the results showed that pyrite taken from Hosn Suleiman (A) begins to dissolve at pH values less than 4.5, and the contact time is about 6 hours. By Comparing the results of sample (A) with sample (B), we found that the dissolution of sample (A) was about three times less than the dissolution of sample (B), and this is due to the fact that sample (A) contains pure and well crystallized pyrite ore while sample (B) contains pyrite combind with calcite, which increases its solubility.
References used
HORN,Y.S;HORN,Q.C.Chemical,structural and electrochemical comparison of natural and synthetic FeS2 pyrite in lithium cells.Electrochimica Acta U.S.A,46,2001,2613-2621.
DESCOSTES,M;VITORGE.P;BEAUCAIRE.C.Pyrite dissolution in acidic media. Geochimica et Cosmochimica Acta U.S.A,Vol.68,No.22,2004,4559-4569.
USTUNDAG,Z;USTANDAG,I;KADIOGLU,Y.K.Multi-element analysis of pyrite ores using polarized energy-dispersive X-ray fluorescence spectrometry.Applied Radiation and Isotopes turkey,2007,809-813.
RICKARD,D;LUTHER,G.W.Chemistry of Iron Sulfides.Chemical Reviews UK,Vol.107,No.2,2007,514-562.
KHABBAZ,M;ENTEZARI.M.H.Simple and versatile one-step synthesis of FeS2 nanoparticles by ultrasonic irradiation.Journal of Colloid and Interface Science Iran, 420,2016,204-210.
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