Heavy metal pollution potential of zinc leach residues discarded in Çinkur plant

• Published in: Turkish journal of engineering & environmental sciences Vol. 22; no. 3; pp. 167 - 177
• Main Authors: TÜMEN, Fikret, ALTUNDOĞAN, H. Soner, ÖZER, Ahmet, ERDEM, Mehmet, ORHAN, Ramazan
• Format: Journal Article
• Language: English
• Published: 1998
• Subjects: Ağır metal kirliliği; Cevherden özütleme; Environmental Pollution; EPA ekstraksiyon testi; EPA extraction test; extraction; filter cake; Filtre çamuru; hazardous waste; heavy metal pollution; Kayseri; Kirlilik izleme; Kurşun; lead; Maden Mühendisliği; Mining Engineering; ore leaching; pollution monitoring; soil pollution; Su kirliliği; Toprak kirliliği; water pollution; Zararlı atık; zinc ore; Çevre Kirliliği; Çinko cevheri; Özütleme
• ISSN: 1300-0160

Bu makalede, Çikur tesislerinde cinko ekstraksiyonunda a çı ğa çı kan filtre keklerinin a ğı r metal çözünürlük
davran ışları üzerine yap ılan çalı şmanı n sonu çları verilmi ştir. Çözünürlük deneyleri yap ılarak keklerden a ğı r metallerin suya ge çi şleri sistematik olarak incelenmi ştir. Metallerin suya ge çi şlerine temas süresi, pH, s ıvı /kat ı oran ve ard ış ık ekstraksiyonları n etkileri incelenmi ş ve metal konsantrasyonları yüzey sular i çin verilen çe şitli limitler ile mukayese edilmi ştir. Keklerden çözünen metallerin konsantrasyonları n ı EPA tarafı ndan verilen toksisite limitleri ile kı yaslamak amacı yla kekler ayrı ca EPA taraf ndan önerilen "Ekstraksiyon testlerine" tabi tutulmu ştur.
Filtre keklerinden a ğı r metallerin çözünürlüklerinin sı vı /katı oranı , temas süresi ve kar ışı m pH'sı na ba ğlı oldu gu belirlenmi ştir. Metallerin çözünen miktarları bu parametrelere ba ğlı olarak de ği şmektedir. Ancak
In this paper, results of the study on heavy metals solubility behaviour of filter cakes from leaching of clinkerized Waelz oxide and flue dust collected during clinkerization in çinkur plant are given. The release of heavy metals into water was investigated by subjecting the cakes to solubility tests systematically. The effect of contact time, pH, liquid/solid ratio and successive extractions on the releasing of heavy metals (Cd, Pb, Mn and Zn) into water was examined and their concentrations in the solutions were compared to the various limits for surface waters. Also, ``Extraction procedure tests'' approved by EPA were applied to the both residues to determine whether concentration of metals released from them are over toxicity limits given by EPA for solid wastes. Solubilization of metals from filter cakes was found to be a function of liquid/solid ratio, contact time and pH of mixture. Depending upon these parameters, the concentration of solubilized metals from the cakes is various. However, the pH of medium is most effective parameter for the solubility of filter cakes. The release of metals into solution was accelerated by increasing acidity, whereas solubilization of Pb was not affected very much. The concentration of Cd and Pb in the extracts obtained from filter cakes by applying EPA extraction procedures at pH 5 are over 1.0 and 5.0 mg/L which are toxicity limits, respectively. The concentration of other metals in the solution are above the limits given by various quality standard for surface water. From these findings, it can be resulted that leach residues are hazardous wastes for environment.