International Doctoral Research Fellowship Programme

Production of Magnetic Nanomaterials as Adsorbents for Precious and Toxic Metal Removal From Aqueous Solutio

Heavy metals removal from wastewaters by using coal washery wastes

Bu çalışmada ağır metal içeren endüstriyel atık su sorununa kömür yıkama tesislerinden çıkan ince boyutlu kömür atıkları kullanılarak çözüm bulunmaya çalışılmıştır. Kömür yıkama atıkları içeriğindeki killi ve karbonlu yapıdan dolayı adsorptif özellikleri bulunmaktadır. Atık suların içerisinde bulunan Pb, Zn, Cu ve Cd metallerinin kömür yıkama atıklarına adsorpsiyonu, pH, temas süresi ve başlangıç konsantrasyon parametreleri ile araştırılmıştır. Ayrıca metallerin hangi mekanizması ile giderildiğinin belirlenmesi amacıyla adsorpsiyon deneylerine paralel çöktürme deneyleri yapılmıştır. Adsorpsiyon izotermlerinden Langmuir, Freundlich, Temkin ve Dubinin-Radushkevich modelleri uygulanmış, bunlardan Langmuir ve Freundlich iyi sonuç verdiği bulunmuştur. Adsorpsiyonun fiziksel olduğu ve hesaplanan Gibss serbest enerjisine göre kendiliğinden geliştiği bulunmuştur. Bu çalışma ile kömür hazırlama tesislerinden üretilen yıkama atıklarının atık sulardan ağır metal uzaklaştırılmasında kullanılabilecek etkili bir adsorbent olduğu belirlenmiştir.In this study, the heavy metal containing waste waters problem is solved with fine coal wastes produced from coal washing plants. Coal washery wastes have adsorptive properties due to their clayey and carbonaceous structure. The adsorption of Pb, Zn, Cu and Cd metals in waste water onto coal washery waste is investigated by pH, contact time and initial concentration parameters. Besides, precipitation tests were carried out to determine the metal removal mechanism is either precipitation or adsorption depending on pH. Langmuir, Freundlich, Temkin and Dubinin-Radushkevich models have been applied as the adsorption isotherms, Langmuir and Freundlich have been found to give the best correlations. It is found that adsorption mechanism is physisorption and the Gibbs energy reaction is spontaneous. As a result of this study, the tailings of the coal preparation plants could be employed as an efficient adsorbent for removal of metal ions from wastewater

Calcium ferrite nanoparticle production from mining wastes: marble dust and pyrite ash

Calcium ferrite nanoparticles were prepared by microwave-sonication assisted hydrothermal route obtained from mining wastes, marble dust and pyrite ash. The magnetism strength, XRD, and FT-IR were performed. Different thermal modifications as microwave and autoclave following sintering applications were investigated. Scanning Electron Microscope images show that microwave treated calcium ferrite nanoparticles have formed as cubic shape while others have irregular-noncrystallized shapes. The arsenic removal was searched by calcium ferrite nanoparticules, found that microwave treated samples have higher capacity

Manganese ferrite nanoparticle production from industrial wastes as sorbent material for arsenic removal from aqueous solutions

Manganese ferrite nanoparticles were prepared by microwave-sonication assisted hydrothermal route and produced from wastes of Li-ion batteries and pyrite ash. The leaching solution of waste pyrite ash was used as the Fe source while the Mn-bearing solution recovered from the Li-ion battery recycling process was used as the Mn source. X-ray diffractometry showed that manganese ferrite can be obtained as single crystalline phase. Scanning electron microscope images showed that double-pyramid or octahedral particles were formed with an average size of 24.3 nm. These MnFe 2 O 4 nanoparticles demonstrated good sorption capacity toward As (101 ± 0.5 mg/g at pH 3)

Pathway to Prediction of Pyrite Floatability from Copper Ore Geological Domain Data

The depletion of mining resources forces the mining industry to process more heterogeneous and complex orebodies. The inherent heterogeneity of these orebodies and their relation to processing recoveries have received considerable interest in recent years. The properties of ores, such as mineral composition and association, are known to affect flotation performance. Even ores with similar compositions can vary significantly regarding their texture, where the same minerals can occur in different forms. Therefore, very careful geometallurgical planning is needed to overcome the recovery losses. Glencore’s Mount Isa Copper Operation has reported historical difficulties decreasing the copper losses associated with natural floatable pyrites. Understanding the rock properties of naturally floatable pyrites and how they relate to chalcopyrite losses is crucial for concentrator operations. The Mount Isa geometallurgy team is looking for proxies for predicting copper losses and natural floatable pyrites to improve mine planning. This paper presents an approach for predicting the collector-less flotation of pyrite, as well as chalcopyrite losses from rock properties. The statistical analysis between the rock quality and ore type gives an indication of the chalcopyrite losses and natural floatable pyrites, which has potential use in geometallurgy plans

Recovery of nanoferrites from metal bearing wastes: Synthesis, characterization and adsorption study

Manganese ferrite (MnFe2O4) nanoparticles were produced by surfactant-assisted method using as metal sources both synthetic chemicals and industrial wastes (spent Li-ion batteries and pyrite ash) and performing different thermal treatments (microwave, autoclave, furnace at different temperature, oven). Nanoferrites obtained using synthetic precursor by microwave-surfactant assisted hydrothermal route showed distinct XRD peak of spinel phase; nanoparticles were characterized by SEM, BET, magnetism and adsorption tests. Nanoferrites were found to have plate shape with 715 nm width size, 5.23 emu/g, 57 ± 1 m2/g surface size, 0.59 ± 0.03 mmol/g arsenic and 0.80 ± 0.04 mmol/g copper adsorption capacity. Thermal treatment performed during synthesis by microwaves gave the best results in terms of crystallinity, surface area, magnetism and metals sorption capacity. In particular, the ideal nanoparticles were found to have octahedron shape with 22.3 nm size, 38.63 emu/g magnetism, 159 ± 1 m2/g surface size, 0.63 ± 0.03 mmol/g As(V) and 1.17 ± 0.05 mmol/g Cu(II) adsorption capacity. Then experimental findings showed that using the same optimized conditions (microwave assisted hydrothermal route) waste precursors gave nanoferrites with different morphology, similar mineralogical phase, and improved characteristics in terms of magnetic properties, surface area and metal sorption capacity