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1

Influence of particle size and feed rate on coal cleaning in a dry separator

Kademli M., Gulsoy O. Y.

Physicochemical Problems of Mineral Processing

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2016

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Vol. 52, iss. 1

204--213

EN

This research is concerned with the effects of particle size distribution and feed rate of feed on the coal cleaning performance of table type air separator. In tests, the lignite and hard coal samples from Mugla and Zonguldak districts in Turkey were used. The samples were tested in three different size distributions such as –38 + 6 mm, –19 + 6 mm and –9.5 + 6 mm. The effect of particle size was investigated together with the feed rate 2 Mg/(hm2), 1.68 Mg/(hm2) and 1.32 Mg/(hm2) and very important physical parameters of table type air separator such as, riffle height, table slope and table frequency. Results were analyzed by using the Tromp curve for indicating the effects in detail. Consequently, the results revealed that the particle size had remarkable effect on separation efficiency. The separation efficiency was, however, inversely affected as the particle size distribution became finer, and the best results were obtained in particle size distribution was –38 + 25 mm in both sample tested. The Ep value was 0.11 for the hard coal samples while it was 0.13 for the lignite samples.

2

Optimum separation route for semi bituminous coal using semi-pilot scale pneumatic stratification jig

Boylu F., Cetinel T., Guven O., Karakas F., Cinku K., Karaagaclioglu I. E., Celik M. S.

Physicochemical Problems of Mineral Processing

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2015

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Vol. 51, iss. 2

559--573

EN

Nowadays, dry beneficiation technologies with an air dense medium fluidized bed come into prominence in the field of coal preparation. In this study, the optimum conditions for different operational parameters such as discharge stargate rate, pulsation frequency, and superficial air velocity were investigated on separation of semi bituminous coal from Soma (Imbat) region using a semi pilot scale Allair jig unit. The experimental studies were carried out with two coal size fractions of -15+4 and -4+1 mm by applying rougher and scavenging stages. After the optimization of each parameter, the results for the rougher stages indicated that clean coal products could be obtained with 11.80% and 16.74% ash contents for -15+4 mm and -4+1 mm size ranges, respectively. In addition, discardable tailings with 65.44% and 60.95 % ash contents could be obtained as the result for the scavenging stages. Finally, the combination of these results for -15+1 mm size exhibited that 59.80% of the feed material with 37.70% ash content can be upgraded to clean coal products with low ash content as 19.80% while the remaining part was discarded as tailings with 68.60% ash content. These values suggested that optimizing the operational parameters of unit brings better results which are applicable in industrial application of dry processes compared to wet processes.

3

Dry Coal Cleaning Technology

Baic I., Blaschke W., Szafarczyk J.

Inżynieria Mineralna

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2014

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R. 15, nr 2

257--262

EN

The Instiute of Mechanised Construction and Rock Mininig - Warsaw, Poland - bought in China a concentracting table for dry cleaning of the type FGX-1. The unit has been tested mechanically since mid – November 2012. Preliminary research of coal dry cleaning has been conducted. These tests were designed to measure the impact of technical and technological parameters on the accuracy of the separation process of the coal from waste rock grains. This paper describes the principles of enrichment, the construction of air concentrating tables, and some of the parameters affecting the accuracy of separation of grains with different densities. It presents the results of dry coal cleaning experiments. The summary indicates the potential of air concentrating tables and highlights their strengths and weaknesses.

PL

Intytut Mechanizacji Budownictwa i Górnictwa Skalnego - Warszawa, Polska - kupił w Chinach stół koncentracyjny do wzbogacania węgla na sucho, typu FGX-1. Urządzenie zostało przetestowane mechanicznie od połowy - listopada 2012. Wstępne badania suchego wzbogacania wegla zostały przeprowadzone w ZG Sobieski. Badania miały na celu zbadanie wpływu parametrów technicznych i technologicznych na dokładność procesu separacji węgla od ziarn odpadów. W artykule opisano zasadę wzbogacania, budowę stołu koncentracyjnego powietrznego, okreslono parametry wpływających na dokładność rozdziału ziaren o różnych gęstościach. Przedstawiono wyniki wzbogacania na sucho węgla. W podsumowaniu wskazano potencjał powietrznej koncentracji wegla, okreslono mocne i słabe strony technologii.

4

Nowa generacja powietrznych stołów koncentracyjnych

Blaschke W.

Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi i Energią PAN

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2013

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nr 84

67--74

PL

Centrum Gospodarki Odpadami i Zarządzania Środowiskowego Instytutu Mechanizacji Budownictwa i Górnictwa Skalnego zakupiło w Chinach powietrzny stół koncentracyjny typu FGX-1. Urządzenie to jest od połowy listopada 2012 roku testowane pod względem mechanicznym. Prowadzone są też wstępne badania wzbogacania węgla kamiennego. Testy te mają na celu zbadanie wpływu parametrów technicznych i technologicznych na dokładność procesu rozdziału ziaren węgla od ziaren skały płonnej. Ze względu na warunki atmosferyczne (stanowisko stoi na wolnym powietrzu) nie można wiarygodnie publikować osiągniętych rezultatów. W artykule omówiono zasady wzbogacania, konstrukcję powietrznych stołów koncentracyjnych oraz niektóre parametry wpływające na dokładność rozdziału ziaren różniących się gęstością. Zamieszczono przykładowe rezultaty wzbogacania (czterech prób) węgla energetycznego. W podsumowaniu pokazano możliwości zastosowania powietrznych stołów koncentracyjnych oraz zwrócono uwagę na ich zalety i wady.

EN

The Institute of Mechanised Construction and Rock Mining — Warsaw, Poland — bought in China a concentrating table for dry cleaning of the type FGX-1. The unit has been tested mechanically since mid-November 2012. Preliminary research on coal dry cleaning has been conducted. These tests were designed to measure the impact of technical and technological parameters on the accuracy of the separation process of the coal from waste rock grains. Due to weather conditions (the stand operates in the open air), the results achieved can not be reliably published. This article describes the principles of enrichment, the construction of air concentrating tables, and some of the parameters affecting the accuracy of separation of grains with different densities. It presents the results of dry coal cleaning experiments (four trials). The summary indicates the potential of air concentrating tables and highlights their strengths and weaknesses.