A CURRENT REVIEW ON BENEFICIATION PROCESS OF BAUXITE ORES FOR PRE-DESILICATION

Year 2018, Volume: 57 Issue: 3, 197 - 218, 01.09.2018

Mustafa Birinci , Ramazan Gök

https://doi.org/10.30797/madencilik.457373

Cited By: 2

Abstract

Today, nearly all commercial production of alumina is obtained from standard Bayer process

using bauxite ores as a raw material. One of the most important criteria for metallurgical-grade

bauxites that can be directly fed to the Bayer process is the total silica content of bauxite.

Because, reactive silica which tends to dissolve during bauxite leaching causes excessive

caustic soda consumption and alumina losses in the Bayer process. For this reason, the reactive

silica content in bauxite plays a critical role in the viability and economics of the Bayer process.

Removing reactive silica from bauxite prior to leaching (also known as pre-desilication) is a

major focus of effort for most alumina production plants. In recent years, it has been known that

beneficiation methods such as froth flotation have been tried to pre-desilication. In this study, the

major problems caused by reactive silica in bauxite ore and several beneficiation methods used

for pre-desilication have been reviewed from the current literature. Among these methods, it has

been determined that froth flotation is more important in terms of silica removal performance and

industrial practice, and so investigations on bauxite flotation have been discussed extensively.

Keywords

Bayer process, Bauxite ore, Reactive silica, Silica removal, Flotation

ÖN DESİLİKASYON AMAÇLI BOKSİT ZENGİNLEŞTİRME İŞLEMLERİ ÜZERİNE GÜNCEL BİR DEĞERLENDİRME

Abstract

Günümüzde ticari alümina üretiminin neredeyse tamamı hammadde kaynağı olarak boksit

cevherlerinin kullanıldığı Bayer prosesiyle karşılanmaya devam etmektedir. Bayer prosesine

doğrudan beslenebilir metalurjik kalitedeki boksitler için en önemli kriterlerden birisi cevherin

toplam silis miktarının bilinmesidir. Çünkü, boksit liçi sırasında çözünme eğilimi gösteren reaktif

silis aşırı miktarda kostik soda tüketimine yol açmakta ve ciddi oranda alumina kayıplarına

neden olmaktadır. Bundan dolayı boksitin reaktif silis içeriği, Bayer prosesinin etkin ve ekonomik

uygulanabilirliği üzerinde belirleyici bir rol oynamaktadır. Silis türlerinin boksitten uzaklaştırılması

işlemi (ön desilikasyon) birçok alümina üretim tesisinin üzerinde çalıştığı ana konulardan birisidir.

Son yıllarda köpük flotasyonu gibi bazı zenginleştirme yöntemlerinin ön desilikasyon amacıyla

denendiği bilinmektedir. Bu çalışmada, boksit cevherindeki reaktif silisin sebep olduğu başlıca

sorunlar ve ön desilikasyon amacıyla uygulanan birtakım zenginleştirme yöntemleri güncel

kaynaklardan derlenerek özetlenmiştir. Bu yöntemler arasında gerek silis uzaklaştırma verimi

gerekse tesis ölçeğinde uygulanabilme bakımından özellikle flotasyonun daha fazla önem

kazandığı belirlenmiş ve bu konuda geniş kapsamda bir değerlendirme yapılmıştır.

Keywords

Bayer prosesi, Boksit cevheri, Reaktif silis, Silis uzaklaştırma, Flotasyon

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