Al2O3 Recovery From Waste Tetra Pak Packages

Year 2023, Volume: 39 Issue: 3, 463 - 474, 31.12.2023

Mehmet Buğdaycı , Ahmet Turan , Levent Öncel , Fatih Bayıroğlu

Abstract

In this study, it was aimed to obtain Al2O3 from waste Tetra Pak packages by using the hydrometallurgical method. Tetra Pak recycling has become an increasingly researched topic around the world. Cellulose, polyethylene and aluminum, which form the structure of Tetra Pak packages, are raw materials that can be reused after recycling. Cellulose was separated from Tetra Pak's structure by hydropulping process and polyethylene was separated from Tetra Pak's structure by leaching with HCl, and optimum parameters of these processes were investigated in experimental studies. Aluminum in the structure was dissolved in acid solution with 100% efficiency in the experiments carried out with 0.1750 M and 0.1312 M acid concentration. Aluminum, which was dissolved in acid solution, was obtained as the AlCl3 phase and precipitated as Al(OH)3 with the addition of 100% stoichiometric NaOH, and the precipitates were calcined at 950 °C for 1 hour to obtain the Al2O3 structure. The materials used in the experimental studies and the products obtained as a result of these experiments were analyzed by Atomic Absorption Spectrometry (AAS), Fourier Transform Infrared (FTIR) Spectroscopy, Scanning Electron Microscopy (SEM) / Energy-Dispersive X-ray Spectroscopy (EDS), and optical microscopy techniques.

Keywords

Aluminum, Tetra Pak, Recycling

Atık Tetra Pak Paketlerinden Al2O3 Geri Kazanımı

Abstract

Bu çalışmada atık Tetra Pak ambalajlarından hidrometalurjik yöntem kullanılarak Al2O3 elde edilmesi amaçlanmıştır. Tetra Pak geri dönüşümü, dünya çapında giderek daha fazla araştırılan bir konu haline gelmiştir. Tetra Pak ambalajlarının yapısını oluşturan selüloz, polietilen ve alüminyum, geri dönüştürülerek yeniden kullanılabilen hammaddelerdir. Tetra Pak’ın yapısından selüloz hidropulping prosesi ile, polietilen ise HCl ile liç prosesiyle ayrıştırılmış ve deneysel çalışmalarda bu prosesler için optimum parametreler araştırılmıştır. Yapıdaki alüminyum, 0,1750 M ve 0,1312 M asit konsantrasyonuyla yapılan deneylerde %100 verimle çözünmüştür. Asit çözeltisinde çözünen alüminyum, AlCl3 fazı olarak elde edilmiş ve %100 stokiyometrik NaOH ilavesiyle Al(OH)3 olarak çöktürülmüştür. Bu çökeltiler Al2O3 yapısı elde etmek için 950 °C'de 1 saat kalsine edilmiştir. Deneysel çalışmalarda kullanılan malzemelerin ve bu deneyler sonucunda elde edilen ürünlerin analizleri Atomik Absorbsiyon Spektroskopisi (AAS), Fourier Dönüşümlü Kızılötesi (FTIR) Spektroskopisi, Taramalı Elektron Mikroskobu (SEM) / Enerji Saçılımlı X-Işını Spektroskopisi (EDS) ve optik mikroskopi teknikleriyle gerçekleştirilmiştir.

Keywords

Alüminyum, Tetra Pak, Geri dönüşüm

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