D2EHPA Kullanılarak Asidik Alüminyum Klorür Çözeltilerinden Demirin Solvent Ekstraksiyonu İle Uzaklaştırılması

Öz

Bu çalışma, bir alüminyum silikat kil cevherinden elde edilen alüminanın saflığını artırmak amacıyla, asidik alüminyum klorür çözeltilerindeki demir (Fe) gibi safsızlıkların uzaklaştırılması için bir yöntem sunmaktadır. Araştırmada, kerosen içinde çözülmüş di(2-etilheksil)fosforik asidin (D2EHPA) çözücü olarak kullanıldığı bir solvent ekstraksiyon yöntemi uygulanmıştır. Çalışma, hem yapay çözeltiler hem de kil cevherinin hidroklorik asit ile liçiyle edilen gerçek liç çözeltileri kullanılarak yürütülmüştür. Anahtar deneysel parametreler arasında reaksiyon süresi, organik-ağır faz oranı (O/A) ve HCl, D2EHPA, demir, alüminyum, potasyum ve sodyum derişimleri yer almaktadır. Sonuçlar, demir uzaklaştırma verimliliğinin hem HCl hem de D2EHPA’nın derişiminin artmasıyla önemli ölçüde iyileştiğini göstermiştir. Bununla birlikte, aşırı klorür iyonu varlığının bu verimlilik üzerinde olumsuz bir etkisi olduğu tespit edilmiştir. McCabe-Thiele diyagramı kullanılarak yapılan analiz, %91'in üzerinde yüksek bir demir uzaklaştırma oranı elde etmek için iki aşamalı bir ekstraksiyon sürecinin gerekli olduğunu işaret etmiştir. Çalışma, bu saflaştırma işlemi için optimal koşulları belirlemiştir: 30 dakikalık bir karıştırma süresi, %20'lik bir D2EHPA konsantrasyonu ve eşit organik-ağır faz oranı (O/A = 1:1). Bu kesin koşullar altında, proses, bu spesifik uygulama için yüksek etkinliğini gösteren %95,58'lik kayda değer bir demir uzaklaştırma verimliliğine ulaşmıştır.

Anahtar Kelimeler

• Asidik alüminyum klorür çözeltileri
• demir giderimi
• solvent ekstraksiyon
• D2EHPA

Removal of Iron From Acidic Aluminum Chloride Solutions by Solvent Extraction Using D2EHPA

Öz

This study presents a method for purifying acidic aluminum chloride solutions, specifically targeting the removal of iron (Fe) impurities to enhance the quality of alumina produced from aluminum silicate clay. The research employed solvent extraction using di(2-ethylhexyl)phosphoric acid (D2EHPA) dissolved in kerosene as the extracting agent. The investigation was conducted using both simulated solutions and actual leach solutions derived from hydrochloric acid processing of clay ore. Key experimental parameters included reaction time, organic-to-aqueous phase ratio (O/A), and the concentrations of HCl, D2EHPA, iron, aluminum, potassium, and sodium. The results demonstrated that the efficiency of iron extraction improved significantly with increased concentrations of both HCl and the D2EHPA extractant. However, the presence of excessive chloride ions was found to have a negative impact on this efficiency. Analysis using a McCabe-Thiele diagram indicated that a high iron removal rate exceeding 91% necessitates a two-stage extraction process. The study identified optimal conditions for this purification: a mixing time of 30 minutes, a D2EHPA concentration of 20%, and an equal organic-to-aqueous phase ratio (O/A = 1:1). Under these precise conditions, the process achieved a remarkable iron removal efficiency of 95.58%, demonstrating its high effectiveness for this specific application.

Anahtar Kelimeler

• Acidic aluminum chloride solutions
• Iron removal
• Solvent extraction
• D2EHPA

Kaynakça

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