Journal Name:
- Dicle Üniversitesi Mühendislik Fakültesi Mühendislik Dergisi
Keywords (Original Language):
| Author Name | University of Author |
|---|---|
Abstract (2. Language):
Froth flotation, as a process in which fine coal
particles are separated selectively from associated
minerals in water slurries, by attachment to rising
air bubbles, has a long history in the coal
enrichment industry. It is the most widely used
method for fine (<1mm) and ultrafine (<0.1mm)
coal cleaning and approximately 142 million tones
of fine coals are cleaned by flotation worldwide
annually. This process can be influenced by a large
number of material, reagent, equipment and
operational variables. Changing one of these
variables certainly affect the results of flotation,
such as ash content and combustible recovery
significantly. The effectiveness of a flotation process
mostly depends on the type and amounts of used
reagents. The reagents used in flotation of coal are
generally collectors and frothers.
The reagent collectors are used to promote the rigid
adhesion of air bubbles to the coal surface. The
purpose of the collector is to make the coal surface
more hydrophobic. In coal flotation generally nonpolar hydrocarbon oils, such as kerosene, fuel oil,
diesel oil and gasoline are used as collector at the
amount of 0.5-5 kg/t. They have been successfully
employed in coal industry to separate combustibles
from the gangue minerals such as clay.
The frother addition is another important operating
parameter which affects flotation performance. This
reagent enables the production of smaller air
bubbles and stabilization of the froth zone. The most
commonly used frothers in coal flotation are MIBC,
Dowfroth-250, Pine oil and 2-Ethyl hexanol at the
amounts of 50-250 gr/t.
In this study, the most suitable frother and collector
type for bituminous coal slime flotation was
investigated. Flotation experiments were carried out
using four different type frothers and four different
type collectors (kerosene, fuel oil, diesel oil,
gasoline) in the Jameson cell. In order to determine
the most suitable frother type, a series of tests was
conducted with MIBC, Dowfroth-250, pine oil and
2-ethly hexanol. In these tests, the collector
(kerosene) dosage was kept constant (1800 g/t),
while frother amount ranged from 100-500 g/t. The
highest flotation efficiency was obtained by using
MIBC as frother and kerosene as collector. On the
other hand, the lowest clean coal ash was achieved
with 2-ethyl hexanol and gasoline. In conclusion, a
coking clean coal with an ash content of 15.48%
was obtained from the bituminous coal slime having
48.80% ash with a combustible recovery of 78 by
using the most suitable collector and frother in the
Jameson cell.
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Abstract (Original Language):
Flotasyon, sulu bir ortam içerisinde hava kabarcığı oluşturmak ve bu kabarcıklarla kıymetli cevheri
yüzdürme yoluyla yapılan bir ayırma ve zenginleştirme işlemidir. Bu çalışmada, Zonguldak bitümlü şlam
kömürünün Jameson hücresinde flotasyonu için en uygun toplayıcı ve köpürtücü cinsi araştırılmıştır.
Flotasyon deneyleri 4 farklı tipte köpürtücü (MIBC, Dowfroth 250, Çamyağı, 2-etil hegzanol) ve 4 farklı
tipte toplayıcı (gazyağı, fuel oil, motorin, benzin) kullanılarak yapılmıştır. En yüksek flotasyon verimi
köpürtücü olarak MIBC, toplayıcı olarak gazyağının kullanılması durumunda elde edilmiştir. Diğer taraftan,
en düşük küllü temiz kömürler 2-etil hegzanol köpürtücüsü ve benzin toplayıcısı ile elde edilmiştir. Sonuçta,
Jameson hücresinde en uygun köpürtücü ve toplayıcı cinsi kullanılarak %48.80 kül içeren bitümlü kömür
şlamlarından, %78 yanabilir verim değeriyle, %15.48 küllü koklaşabilir özellikte temiz kömürler üretilmiştir.
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