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1

Peat and lignite leaching process with tetralin in autoclave to produce oil

Depci T., Karta M.

Physicochemical Problems of Mineral Processing

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2018

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Vol. 54, iss. 2

334--342

EN

Instead of directly burning a lignite having low calorific value and peat, the Elbistan lignite (L) and the Adiyaman peat (P) were mixed and leached in an autoclave to obtain an oil to not only provide the demand for energy but also protect the environment. The effects of the peat ratio in the mixture on the properties of co-liquefaction products (oil, char, asphaltene, and preasphaltene) and oil yield were investigated in details. The products were characterized by XRD, FTIR, and elemental analysis. In addition, the composition of the oil was identified by GC/MS, showing that the peat ratio did not affect the chemical composition of the oil due to the high lignin content and the nearly same elemental compositions. On the other hand, the oil yield for a co-liquefaction process was found as 34.3% to be higher than the average value of oil yields obtained from the individual feeds (24.3% for lignite and 28% for peat), showing the synergistic effects between the lignite and peat. The obtained oil was paraffinic-low waxy oil with 5138.62 kcal/kg of calorific value and 0.94 g/cm3 density. Finally, it was suggested that the production of a more valuable product using the peat and the lignite having low calorific value will not only contribute more to the country's economy in future but also be better for the environment, instead of directly burning them.

2

Chemical characterization of patnos scoria (Agri, Turkey) and its usability for production of blended cement

Depci T., Efe T., Tapan M., Ozvan A., Aclan M., Uner T.

Physicochemical Problems of Mineral Processing

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2012

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Vol. 48, iss. 1

303-315

EN

This paper reports results of investigations on suitability of scoria (PTS), collected from Patnos (Agri) in Turkey, for blended cement production. Scoria (basic pumice) was chosen as cement replacement materials due to its availability and cost in Agri in Turkey. The portland cement was replaced by scoria within the range of 0, 5, 10, 20, 30, 40 and 50%. Characterization of scoria was subjected by the X-ray fluorescence (XRF), X-ray diffraction (XRD), Fourier Transform Infrared (FTIR) spectroscopy, Scanning Electron Microscopy (SEM), BET surface area and porosity, zeta potential (?) and thin sections. The standard tests were conducted for the obtained fresh and hardened states of scoria blended cement paste. Furthermore, the obtained cements were characterized by the XRF. According to experimental results, scoria up to 20% ratio could be added into clinker and it has a good potential of manufacturing blended scoria cement.

3

Adsorption of crystal violet from aqueous solution on activated carbon derived from Gölbaşi lignite

Depci T., Kul A. R., Onal Y., Disli E., Alkan S., Turkmenoglu Z. F.

Physicochemical Problems of Mineral Processing

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2012

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Vol. 48, iss. 1

253-270

EN

Activated carbon (AC) was obtained from lignite of the local resource, Gölbaşi - Adiyaman (Turkey) by chemical activation. The Gölbaşi lignite was chosen as the precursor for its availability and low cost. The BET surface area of the activated carbon was found 921 m2/g. The AC was used as an adsorbent for Crystal Violet (CV) in aqueous solution. The adsorption properties of CV onto the activated carbon are discussed in terms of the adsorption isotherms (Langmuir and Freundlich) and the kinetic models (pseudo-first-order, pseudo-second-order and intraparticle diffusion model). It was shown that the experimental results best fitted by the Langmuir model, and the second-order kinetic equation. The thermodynamic parameters show that the adsorption process is endothermic. The experimental results point out that the obtained activated carbon is a viable candidate for sorbent removing CV from aqueous solutions.

4

The effect of different starting materials on the synthesis of lithium triborate

Depci T., Ozbayoglu G., Yilmaz A.

Physicochemical Problems of Mineral Processing

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2007

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Vol. 41

101-105

EN

Lithium triborate (LiB3O5) was synthesized using different starting materials. The effect of these materials on the phase purity of LiB3O5 was investigated in each case. Identification and characterizations of the products were carried out by powder X-ray diffraction (XRD) and infrared (IR) analyses. The present study showed that the starting materials play an important role in the synthesis of lithium triborate with respect to phase impurity.

PL

Syntezowano trójboran litu (LiB3Os) stosując różne materiały wyjściowe. Badano wpływ tych materiałów na końcową czystość LiB3O5. Identyfikowano i charakteryzowano produkty syntezy za pomocą dyfrakcji rentgenowskiej (XRD) oraz analizy spektroskopowej w podczerwieni (IR). Badania wykazały, że wyjściowe materiały grają ważna rolę w czystości syntezowanego trójboranu litu.