Iron Removal by HCl Acid Leaching From BaTa2O6 Ceramic Produced by Mechanochemical Synthesis

Yıl 2014, Cilt: 14 Sayı: 3, 493 - 498, 01.12.2014

Mustafa İlhan , Ayhan Mergen Cemalettin Yaman

Öz

Hydrochloric acid leaching was applied to remove iron impurity from BaTa2O6 ceramic produced by mechanochemical synthesis. Leaching was performed using acid concentration of 6-12 M HCl, temperature of 95-105 °C and leaching time of 1-15 h. Fe impurity content in the leached powders was determined by EDS analysis. 10.36% Fe content in the milled powder decreased to 1.97-3.16% indicating 70-81% reduction in iron content after leaching. Leach temperature was more effective than concentration in iron removal. Most of the iron impurity in BaTa2O6 ceramic powder was removed after 1h of leaching due to low activation energy and rapid micropore growth. Nevertheless, the iron content cannot be decreased to low levels due to high iron content in the cracks and voids

Anahtar Kelimeler

Mechanochemical

Mekanokimyasal Sentezle Üretilen BaTa2O6 Seramiğinde HCl Asit Liçi ile Demir Giderimi

Öz

Mekanokimyasal sentez yöntemiyle üretilen BaTa2O6 seramik tozunda öğütme ortamından kaynaklanan empürite demirin giderilmesi amacıyla hidroklorik asit liçi uygulanmıştır. Liç işlemi 6-12 M HCl asit konsantrasyonu, 95-105 °C sıcaklık ve 1-15 saat aralığında değişen sürelerde uygulanmıştır. Liç edilen numunelerde empürite Fe miktarı EDS analizi ile belirlenmiştir. Öğütme tozunda %10.36 olan Fe konsantrasyonu, liç sonrası %1.97-3.16 seviyelerine düşerek, demir miktarı %70-81 azalma göstermiştir. Demir azalışında, liç sıcaklığının konsantrasyondan daha etkilidir. BaTa2O6 seramik tozunda demir empüritesinin büyük bir kısmı düşük aktivasyon enerjisi ve yüzeyde hızlı mikropor çap büyümesi nedeniyle ilk 1 saat içerisinde giderilmektedir. Ancak, çatlak ve boşluklarındaki yüksek Fe içeriği nedeniyle demir giderimi uzun sürelerde dahi çok düşük seviyelere indirilememektedir

Anahtar Kelimeler

Mekanokimyasal Sentez, HCl Asit Liçi, Demir Giderimi, BaTa2O6 Seramiği.

Kaynakça

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