Investigation of Phosphate Adsorption Properties of Zinc Production Residue Cakes

Öz

In this study, the conditions for removing phosphate from the aqueous environment of the residue containing zinc and iron in addition to lead, which is called as lead cake and formed during zinc production in çinkur plants in Kayseri was investigated. For this purpose, the effects of parameters such as cake dose, time, and environment pH and temperature and phosphate concentration on the removal of phosphate from aqueous environment with this cake were investigated. Using the obtained results, adsorption isotherms were obtained and some thermodynamic quantities were calculated. In the experiments, it was found that the phosphate removal efficiency is highly dependent on the pH and the lead cake dose. In addition, it was observed that phosphate removal complied with the Langmuir and Freundlich isotherm, and the equilibrium was established at the end of a period of 120 minutes. Approximately 75% of the phosphate in the solution can be removed by mixing the orthophosphate solution with a concentration of 100 mg-P /L with an original pH of 7.69 with lead cake at a dose of 30 g /L and contacting it for 120 minutes.

Anahtar Kelimeler

• Zinc Extraction Wastes
• Lead Cakes
• Phosphate Removal
• Adsorption

Çinko Üretimi Atık Kekinin Fosfat Adsorpsiyon Özelliklerinin İncelenmesi

Öz

Bu çalışmada Kayseri’de bulunan Çinkur işletmelerinde, çinko üretimi sırasında meydana gelen kurşunlu kek olarak adlandırılan, yüksek oranda kurşunun yanında çinko ve demir içeren artığın sulu ortamdan fosfat uzaklaştırılma şartları araştırılmıştır. Bu amaçla bu kekle sulu ortamdan fosfat giderilmesi üzerine, kek dozu, süre, ortam pH’sı ve sıcaklığı ve fosfat konsantrasyonu gibi parametrelerin etkileri incelenmiştir. Elde edilen sonuçlar kullanılarak adsorpsiyon izotermleri elde edilmiş ve bazı termodinamik büyüklükler hesaplanmıştır. Yapılan deneylerde fosfat giderme veriminin önemli ölçüde pH’ya ve kurşun keki dozuna bağlı olduğu bulunmuştur. Ayrıca fosfat uzaklaştırılmasının Langmuir ve Freundlich izotermine uyduğu, 120 dakikalık bir sürenin sonunda dengenin kurulduğu gözlenmiştir. Orijinal pH’sı 7.69 olan 100 mg-P/L konsantrasyonundaki ortofosfat çözeltisinin, 30 g/L dozunda kurşun kekiyle karıştırılıp 120 dakika temas ettirilmesiyle çözeltideki fosfatın yaklaşık %75’i giderilebilmektedir.

Anahtar Kelimeler

• Çinko Ekstraksiyon Atıkları
• Kurşun Kekler
• Fosfat Giderimi
• Adsorpsiyon

Kaynakça

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