Eti Maden Müdürlüğü Kırka Bor İşletmeleri Atıksularında Bulunan Lityumun Elde Edilmesi İçin Li-Mn-O Yapılı Adsorbentin Sentezi ve Kullanımının Araştırılması
Özet
Studies on the production and recovery of lithium compounds, which are especially needed in the production of lithium ion batteries, have gained importance in recent years. In recent years, the synthesis and use of template manganese oxide adsorbents has come to the fore in the recovery of lithium(I) ions from waste batteries, sea water, geothermal waters and wastewater containing lithium(I) ions. In this thesis, it is aimed to recover the lithium (I) ions in the wastewater of Kırka Boron Plant by selective adsorption to the template manganese oxide adsorbent by desorption. The adsorbent synthesized by solid state reaction by using LiOH.H2O and Mn3O4 was prepared by washing the redox type spinel LiMn2O4 structure with HCl solution. The characterization studies of the adsorbent structure showed the accuracy of the synthesis.
Experimental studies were carried out with synthetic lithium(I) solution and Kırka Boron Plant wastewater and the results were compared. In the first stage of the studies, the effects of initial pH, initial lithium(I) ion concentration and adsorbent concentration on the adsorption equilibrium in lithium(I) ion adsorption from synthetic solution were investigated and the most suitable working conditions were pH 10, adsorbent concentration 10 g/L and initial lithium(I) ion concentration 200 mg/L. The highest lithium(I) adsorption capacity of the adsorbent in the Langmuir model was found to be 12,71 mg/g.
In the next stage of the studies, the adsorption/desorption of lithium(I) ions from Kırka Boron Plant wastewater was investigated together with ions such as calcium(II), magnesium(II), sodium(I), potassium(I), and boron(III). The reusability of the λ-MnO2 adsorbent was investigated. Since Kırka Boron Plant wastewater has a pH value of 9.54 and adsorption was carried out without a preliminary pH adjustment. The lithium(I) adsorption capacity of the adsorbent in this wastewater containing 165,5 mg/L lithium(I) was determined as 8,31 mg/g.
In the last stage of the studies, the recovery of lithium(I) ions adsorbed by λ-MnO2 adsorbent from wastewater was investigated and 91.5% efficiency was obtained in the first desorption. This adsorption/desorption study was repeated 5 times and the results showed that the desorption efficiency of λ-MnO2 adsorbent decreased by about 10% from 91.5% to 82.5%.
