Physical-Chemical and Mineralogical-Petrographic Examinations of Trepel from Republic of Macedonia (original) (raw)
Related papers
STRUCTURAL EXAMINATIONS OF NATURAL RAW MATERIALS PUMICE AND TREPEL FROM REPUBLIC OF MACEDONIA
STRUCTURAL EXAMINATIONS OF NATURAL RAW MATERIALS PUMICE AND TREPEL FROM REPUBLIC OF MACEDONIA, 2013
"""The aim of this paper is to present the physic-mechanical, chemical and mineralogical-petrographic examinations of the pumice and trepel. The pumice is from deposit site called Bojanciste, near Kavadarci, and the trepel deposit is from Suvodol near Bitola, Republic of Macedonia. The mineralogical-petrographic examinations of the pumice and pumicite have shown that the main component of the pumice and pumicite it is the volcanic glass, while in the crystal phase there is presence of albit, oligoclass, anorthit, microklin and in small quantities presence of quartz, biotit and augit. The examinations of the trepel have shown that it is a sedimentary rock (of biogenic origin) with greyish-white colour, very light and soft, porous and with fine to superfine grained structure. The trepel is composed mainly of opal as well as quartz, feldspar, illite and chlorites. Keywords: raw materials, pumice, trepel, structural analysis"""
A b s t r a c t: For the characterization of the natural amorphous SiO2 found in a new deposit in Republic of Macedonia, the following examinations were performed: physical-mechanical, chemical, mineralogical, SEM, IR and thermal examinations. Physical-mechanical analyses show that it is a white to grey colored rock, of low hardness, with a low volumetric mass and high porosity. Chemical analyses show that the material dominantly contains SiO2. Mineralogical and XRD analyses show high percentage of isotropic amorphous mass content, with minimal contents of submicroscopic cryptocrystalline mass. Thermal analyses show high thermal stability. Based on the conducted research of the raw material from the new deposit, it can be concluded that it represents SiO2-diatomite of high quality, useful for various purposes.
Effect Of Thermal Treatment Of Trepel At Temperature Range 800-1200˚C
Open chemistry, 2019
Trepel is the local name for a mixture of diatomaceous earth and clay minerals. It represents a greyish, soft, very light, weakly cemented, fine biogenetic sedimentary rock. The studied material is taken from the vicinity of Bitola city (Republic of Macedonia). Here, trepel was treated up to three temperature intervals (800, 1000 and 1200ºC) for a period of 1 hour. The X-ray powder diffraction results indicate the presence of both an amorphous phase and the following crystalline phases: quartz, feldspars (plagioclase), mica (muscovite) and chlorites. The results of SEM analysis revealed skeletons of alga Diatomeae with nano-pores. By thermal treatment of the samples, a gradual change in color as well as higher bulk density and compressive strength was observed. The increase of the temperature, in addition, affected the mineralogical composition and increased the presence of the amorphous phase (aluminasilicate glassy phase). SEM results of the thermally investigated samples depicted morphological changes expressed by shrinkage of the pore diameters in comparison to the initial material. The major and minor constituents were established by chemical analysis revealing the following chemical composition of raw trepel: SiO 2 (63.65 wt%), Al 2 O 3 (11.76 wt%), Fe 2 O 3 (5.93 wt%), MnO (0.13 wt%), TiO 2 (0.63 wt%), CaO (1.42 wt%), MgO (2.22 wt%), P 2 O 5 (0.11 wt%), K 2 O (1.63 wt%), Na 2 O (0.92 wt%), LOI (11.50 wt%).
Hamidiye / Gaziantep bölgesi krom cevherleşmelerinin mineralojisi ve potansiyel özellikleri
2019
TEZ11880Tez (Yüksek Lisans) -- Çukurova Üniversitesi, Adana, 2019.Kaynakça (s. 77-81) var.xviii, 83 s. : res. (bzs. rnk.), tablo ; 29 cm.Çalışma konusunu oluşturan kromit cevherleşmesi, Islahiye Bölgesi sınırlarında N37 c3 paftasında içerisinde bulunan Alt Kretase yaşlı ‘Ofiyolit nap’ı olarak değerlendirilmiş birim içerisinde bulunmaktadır. Kromittler, Dünit, ve harzburjitlerden oluşan tektonitler içerisinde faylara bağlı merceksi, ince tabakamsı olarak masif, saçınımlı nodüler yapıda bulunmaktadır. Yapılan çoklu sondaj verilerinden alınan kayaç ve kromit örneklerinde Pt, Pd, Rh ve Au için ICP-MS yöntemi ile, kromitlerde iz element içerikleri analiz edilmiştir. Kimyasal analiz sonuçlarına göre kromit %Cr2O3 42,03-52,1, Cr/Fe oanı 3,794- 4,216 arasında, PGE içeriklerinde; Ru oranı 90 ile 130 ppb, Ir oranı 24 ile 40 ppb, Os oranı 13 ile 50 ppb ve Rh oranı 6 ile 11 ppb arasında değişmektedir. Çalışma alanı cevherleşmelerinin, Plütonik kromitler ile NATO podiform kromitleri arasında bir...