Utilization of Ultrasonic Waves in the Flotation of Coal with High Ash-Sulfur Content

Ercan Şahinoğlu

Makale detayları

Utilization of Ultrasonic Waves in the Flotation of Coal with High Ash-Sulfur Content

Yazarlar:

Ercan Şahinoğlu

Yayıncı:

Afyon Kocatepe University

Ana Başlıklar:

Yer Bilimleri ve Jeoloji Mühendisliği (Diğer)

Dergi:

Afyon Kocatepe Üniversitesi Fen Ve Mühendislik Bilimleri Dergisi Vol.24 Issue 2, pp.441-446

Belge Tipi:

Makale

Yayın Tarihi:

4/2024

Belge Dili:

Türkçe

Document ID (Org No.):

2001315297

pISSN:

2149-3367

Anahtar kelimeler:

Özet:

 Coal is recognized as one of the most important fossil fuels. However, the use of coal without cleaning can cause serious environmental problems. For this reason, coal must be cleaned before use. Flotation is one of the methods used to clean fine-sized -0.5 mm coals. The flotation method utilizes the difference in surface properties of the grains. Many studies have been carried out to increase the efficiency of coal flotation. The use of ultrasonic waves in flotation is one of these studies. Cleaning the surfaces of oxidized coals, removing clay minerals from the surface of coals, and separating minerals adsorbed on the coal surface from the coal are very important factors for the successful flotation process. It is known that ultrasound is used to clean the surfaces of materials in many scientific fields thanks to its cavitation effect. The mechanical effects produced by ultrasonic cavitation cause an increase in flotation selectivity by removing the clay and oxide layer from the coal surface to restore the hydrophobic surface of coal particles. Therefore, ultrasonic waves can be used in coal flotation to clean the surface of the coals before the flotation process to make the coals more hydrophobic. In this study, the floatability of coal with high ash-sulfur content was investigated by flotation method using only ultrasonic waves without using chemical reagents. Müzret coal was subjected to ultrasonic treatment at different ultrasonic times 0.5; 1; 2; 3 and 4 minutes and flotation experiments were carried out. The combustible recovery, ash rejection and efficiency index of the clean coals obtained were found. The maximum combustible recovery was 60.49 at 4 minutes of ultrasonic treatment. Ash rejection values and efficiency index values vary between 77.98-79.84 and 29.27-38.47, respectively. In addition, it was determined that the pyritic sulfur content of the coal was significantly reduced.

 Coal is recognized as one of the most important fossil fuels. However, the use of coal without cleaning can cause serious environmental problems. For this reason, coal must be cleaned before use. Flotation is one of the methods used to clean fine-sized -0.5 mm coals. The flotation method utilizes the difference in surface properties of the grains. Many studies have been carried out to increase the efficiency of coal flotation. The use of ultrasonic waves in flotation is one of these studies. Cleaning the surfaces of oxidized coals, removing clay minerals from the surface of coals, and separating minerals adsorbed on the coal surface from the coal are very important factors for the successful flotation process. It is known that ultrasound is used to clean the surfaces of materials in many scientific fields thanks to its cavitation effect. The mechanical effects produced by ultrasonic cavitation cause an increase in flotation selectivity by removing the clay and oxide layer from the coal surface to restore the hydrophobic surface of coal particles. Therefore, ultrasonic waves can be used in coal flotation to clean the surface of the coals before the flotation process to make the coals more hydrophobic. In this study, the floatability of coal with high ash-sulfur content was investigated by flotation method using only ultrasonic waves without using chemical reagents. Müzret coal was subjected to ultrasonic treatment at different ultrasonic times 0.5; 1; 2; 3 and 4 minutes and flotation experiments were carried out. The combustible recovery, ash rejection and efficiency index of the clean coals obtained were found. The maximum combustible recovery was 60.49 at 4 minutes of ultrasonic treatment. Ash rejection values and efficiency index values vary between 77.98-79.84 and 29.27-38.47, respectively. In addition, it was determined that the pyritic sulfur content of the coal was significantly reduced.

 Coal is recognized as one of the most important fossil fuels. However, the use of coal without cleaning can cause serious environmental problems. For this reason, coal must be cleaned before use. Flotation is one of the methods used to clean fine-sized -0.5 mm coals. The flotation method utilizes the difference in surface properties of the grains. Many studies have been carried out to increase the efficiency of coal flotation. The use of ultrasonic waves in flotation is one of these studies. Cleaning the surfaces of oxidized coals, removing clay minerals from the surface of coals, and separating minerals adsorbed on the coal surface from the coal are very important factors for the successful flotation process. It is known that ultrasound is used to clean the surfaces of materials in many scientific fields thanks to its cavitation effect. The mechanical effects produced by ultrasonic cavitation cause an increase in flotation selectivity by removing the clay and oxide layer from the coal surface to restore the hydrophobic surface of coal particles. Therefore, ultrasonic waves can be used in coal flotation to clean the surface of the coals before the flotation process to make the coals more hydrophobic. In this study, the floatability of coal with high ash-sulfur content was investigated by flotation method using only ultrasonic waves without using chemical reagents. Müzret coal was subjected to ultrasonic treatment at different ultrasonic times 0.5; 1; 2; 3 and 4 minutes and flotation experiments were carried out. The combustible recovery, ash rejection and efficiency index of the clean coals obtained were found. The maximum combustible recovery was 60.49 at 4 minutes of ultrasonic treatment. Ash rejection values and efficiency index values vary between 77.98-79.84 and 29.27-38.47, respectively. In addition, it was determined that the pyritic sulfur content of the coal was significantly reduced.

 Kömür en önemli fosil yakıtlardan biri olarak kabul edilmektedir. Ancak, kömürün temizlenmeden kullanılması ciddi çevre sorunlarına neden olabilmektedir. Bu nedenle kömürlerin kullanılmadan önce temizlenmesi gerekmektedir. Toz boyutlu -0,5 mm kömürlerin temizlenmesinde kullanılan yöntemlerden bir tanesi flotasyondur. Flotasyon yönteminde tanelerin yüzey özellikleri farklılığından yararlanılır. Kömür flotasyonunun etkinliğinin artırılması için birçok çalışma yapılmaktadır. Ultrasonik dalgaların flotasyonda kullanımı da bu çalışmalardan bir tanesidir. Oksitli kömürlerin yüzeylerinin temizlenmesi, kil minerallerinin kömürlerin yüzeyinden uzaklaştırılması, kömür yüzeyine adsorbe olmuş minerallerin kömürden ayrılması flotasyon işleminin başarılı bir şekilde yapılması için çok önemli olan faktörlerdendir. Ultrasonun kavitasyon etkisi sayesinde pek çok bilim alanında malzemelerin yüzeylerini temizleme amacıyla kullanıldığı bilinmektedir. Ultrasonik kavitasyon tarafından üretilen mekanik etkiler, kömür partiküllerinin hidrofobik yüzeyini eski haline getirmek için kömür yüzeyinden kil ve oksit tabakasını kaldırarak flotasyon seçiciliğinde bir artışa neden olur. Dolayısıyla ultrasonik dalgalar kömürün flotasyonunda, flotasyon işleminden önce kömürlerin yüzeylerini temizleyip kömürleri daha fazla hidrofobik yapmak amacıyla kullanılabilir. Bu çalışmada, yüksek kül-kükürt içerikli kömürün kimyasal reaktif kullanılmadan sadece ultrasonik dalgalar kullanılarak flotasyon yöntemiyle yüzebilirliği araştırılmıştır. Müzret kömürü farklı ultrason sürelerde 0,5; 1; 2; 3 ve 4 dak. ultrasonik işleme tabi tutulup flotasyon deneyleri gerçekleştirilmiştir. Elde edilen temiz kömürlerin yanabilir verim, kül giderimi ve verim indeksleri bulunmuştur. Maksimum yanabilir verim 4 dakika ultrason süresinde 60,49 olarak elde edilmiştir. Kül giderimi değerleri ve verim indeksi değerleri sırasıyla 77,98-79,84 ve 29,27-38,47 arasında değişmektedir. Bununla birlikte kömürün piritik kükürt içeriğinin de önemli ölçüde azaltıldığı belirlenmiştir.

Makale detayları

Utilization of Ultrasonic Waves in the Flotation of Coal with High Ash-Sulfur Content

Yazarlar:

Ercan Şahinoğlu

Yayıncı:

Afyon Kocatepe University

Ana Başlıklar:

Yer Bilimleri ve Jeoloji Mühendisliği (Diğer)

Dergi:

Afyon Kocatepe Üniversitesi Fen Ve Mühendislik Bilimleri Dergisi Vol.24 Issue 2, pp.441-446

Belge Tipi:

Makale

Yayın Tarihi:

4/2024

Belge Dili:

Türkçe

Document ID (Org No.):

2001315297

pISSN:

2149-3367

Coal

Flotation

Ultrasonic waves

Combustible recoveryKömür

Flotasyon

Ultrasonik dalgalar

Yanabilir verim

Sayı

Makale detayları

Yazarlar: Ercan Şahinoğlu

Yayıncı: Afyon Kocatepe University

Ana Başlıklar: Yer Bilimleri ve Jeoloji Mühendisliği (Diğer)

Dergi: Afyon Kocatepe Üniversitesi Fen Ve Mühendislik Bilimleri Dergisi Vol.24 Issue 2, pp.441-446

Belge Tipi: Makale

Yayın Tarihi: 4/2024

Belge Dili: Türkçe

Document ID (Org No.): 2001315297

pISSN: 2149-3367

Sayı

Yazarlar:

Ercan Şahinoğlu

Yayıncı:

Afyon Kocatepe University

Ana Başlıklar:

Yer Bilimleri ve Jeoloji Mühendisliği (Diğer)

Dergi:

Afyon Kocatepe Üniversitesi Fen Ve Mühendislik Bilimleri Dergisi Vol.24 Issue 2, pp.441-446

Belge Tipi:

Makale

Yayın Tarihi:

4/2024

Belge Dili:

Türkçe

Document ID (Org No.):

2001315297

pISSN:

2149-3367