Haldun Kurama

In this study, Bigadic upper zone zeolitic tuff, which contains about 87% clinoptilolite was used as an ion exchanger for removal of Pb{sup ++}, Cu{sup ++}, Cd{sup ++} and Hg{sup ++}ions from wastewater. Bench scale experiments with two different glass columns, were carried out continuously under the closed/open circuit conditions. Before ion exchange tests, zeolite samples were treated with NaCl (6ml/min. and 42BV). The effects of particle size, bed volume, pH and flow rate on the ion exchange capacity were determined. Under the best operation conditions, the effect of initial influent solution concentration on ion exchange selectivity was tested. As a result, it was found that the Bigadic clinoptilolite had the following ion exchange capacities; Pb{sup ++}, 0.7540 meg/g; Cu{sup ++}, 0.6986 meg/g; Cd{sup ++}, 0.6580 meg/g; Hg{sup ++}, 0.5530 meg/g.

... ESKİŞEHİR Ebru ATAŞLAR, İsmühan POTOĞLU, Filiz SAVAROĞLU, Süleyman TOKUR Osmangazi Üniversitesi. ... Bir heulandit grubu minerali olan klinoptilolit (Na4K4)(Al8Si40 09 6 .24H2 0), silika içeriğinin yük sek olması nedeniyle yüksek silikalı heulandit olarak sınıflandırılır. ...

In this paper, dissolved air flotation (DAF) was examined as a possible treatment method for the removal of ammonium ions (NH4+) from surface water. A natural zeolite, clinoptilolite sample with a fine particle size (<10µm) was used as a carrier material during the flotation tests. Two types DAF cells, batch and continuous implemented in our laboratories, were used in the flotation experiments. Flotation tests revealed that the test loaded with 5mg/L ammonium resulted in a residual ammonium concentration of <0.5mg/L with corresponding turbidity values of treated water (<10NTU). It was observed that the usage of carrier material with higher treatment capacity and finer ion exchange material of higher surface area than classical ion exchangers may provide better advantages over the classical DAF method.

A lead‐zinc ore deposit in Balikesir/Balya, Turkey, was mined and abandoned almost 70 years ego. Nearly 1,000,000 tons of flotation tailings and 300,000 tons of slag, which contain considerable amounts of zinc remain. In this study, an assessment of the technical feasibility of an acidic leach process for the recovery of zinc from slag was considered. The slag contained approximately 29% Fe, 13% Zn, 3% Pb and 2% S. Preliminary leach tests showed that it was not possible to achieve a selective and efficient extraction of Zn from the slag using low concentrations of H2SO4 and low temperatures. This result can be attributed to the proportions of zinc present as oxide and ferrite (Zn Fe2O4). This slag composition has a significant effect on treatment options because the oxide is soluble to a varying degree in most leachants, whereas ferrites tend to be insoluble. In order to increase the recovery using extraction, leaching tests were performed in two stages. Slag was first subjected to leaching, and residue was contacted with a hot and more concentrated sulfuric acid solution in order to dissolve the ferrite. The dissolved iron was then recovered from solution by ammonium jarosite precipitation. The optimum conditions to leach the slag were determined: 1.85 N and 4.07 N H2SO4 at 1/10 solids ratio, at a temperature of 55° C and 95° C in the first and second stages, respectively. Results show that the 77.45% Zn extraction could be achieved by atmospheric leaching. Compared to other processes, such as pressure leaching, ammonia, and NaOH leaching, pressure leaching had the highest extraction efficiency of 87% Zn and 80% Fe, but may have extremely high investment and operation costs.

... above 6% LOI level [4]. Consequently, it is critical that removal/recovery technologies should be developed so that high carbon CBA ... 2.1. Characterization of material. ... in a ceramic ball mill to a fineness of the 25 mass% residues on a 38 μm to improve its pozzolanic properties. ...

In this study, Bigadic upper zone zeolitic tuff, which contains about 87% clinoptilolite was used as an ion exchanger for removal of Pb{sup ++}, Cu{sup ++}, Cd{sup ++} and Hg{sup ++}ions from wastewater. Bench scale experiments with two different glass columns, were carried out continuously under the closed/open circuit conditions. Before ion exchange tests, zeolite samples were treated with NaCl (6ml/min. and 42BV). The effects of particle size, bed volume, pH and flow rate on the ion exchange capacity were determined. Under the best operation conditions, the effect of initial influent solution concentration on ion exchange selectivity was tested. As a result, it was found that the Bigadic clinoptilolite had the following ion exchange capacities; Pb{sup ++}, 0.7540 meg/g; Cu{sup ++}, 0.6986 meg/g; Cd{sup ++}, 0.6580 meg/g; Hg{sup ++}, 0.5530 meg/g.

Although there are various studies published in the relevant literature on the use of borates in tile production, borax waste has been mainly used in place of feldspar and the results showed that borate migration to the surface was the commonly encountered problem. Previously, the same authors have investigated the possible use of dewatering sieve waste (TSW) of Etibor Kırka

In this study, hydration behavior of the magnesia waste, supplied from the electrostatic bag house of the sintering unit of MAS Company, Eskisehir-Turkey was studied to find out re-usability of the material as a source of magnesium hydroxide (Mg(OH)2) production. According to chemical and crystalline phase analyses, MgO content of the sample was determined as 49.9 wt% and consists of mainly raw magnesite (MgCO3), sintered magnesia-periclase (MgO) and small amount of serpentine (lizardite) phases. In hydration process, the reactivity of magnesium oxide determines the rate and extent of hydration of the sample. Therefore, the waste samples both calcined and uncalcined forms were hydrated in water and the efficiencies were compared according to sample source. The hydration experiments were carried out at temperatures ranging from 30 C and 80 C to evaluate the influence of temperature on particle morphology and surface areas of the products. The efficiency of the hydration was evaluat...

In this study, commercial fertilizers, natural zeolit and zeolites saturated with fertilizer are treated on the seeds of Triticum sativum and Cucumis sativus. Effects on seed germinations and plant growth of these substances were studied. As a result of this study; it was found out that zeolit could be used as a nitrat carrier in the preparation of fertilizer and that amonium could be assesed by plants more effectively and that more manure could be saved.

Abstract: In this study, hydration behavior of the magnesia waste, supplied from the electrostatic bag house of the sintering unit of MAS Company, Eskisehir-Turkey was studied to find out re-usability of the material as a source of magnesium hydroxide (Mg(OH) 2 ) production. According to chemical and crystalline phase analyses, MgO content of the sample was determined as 49.9 wt% and consists of mainly raw magnesite (MgCO 3 ), sintered magnesia-periclase (MgO) and small amount of serpentine (lizardite) phases. In hydration process, the reactivity of magnesium oxide determines the rate and extent of hydration of the sample. Therefore, the waste samples both calcined and uncalcined forms were hydrated in water and the efficiencies were compared according to sample source. The hydration experiments were carried out at temperatures ranging from 30 C and 80 C to evaluate the influence of temperature on particle morphology and surface areas of the products. The efficiency of the hydrati...

Bu caltsmada, yanma islemi strasinda elektrostatik filtrelerde toplanan Tuncbilek termik santralt ucucu kulu icerisindeki metal iyonlarintn (Ni, Cd, Mn) potansiyel hareketliliginin belirlenmesi amaclanmtstir. Caltsmantn ilk bolumunde farklt pH degerlerinde gerceklestirilen kolon lici deneyleri sonunda, pli'taki azalmanin ucucu kulden metal iyonlartrun cozundurulmesinde etkili oldugu tespit edilmistir. Ni ve Cd, cozundurme isleminin ilk 20 dakikast icerisinde htzlt bir sekilde katt partikulden uzaklasirken, matriks elementi olan Mn icin cozunme htzt daha yavasttr. Caltsmantn ikinci ktsminda kul partikul icerisinde farkli kimyasal bilesimlerde bulunan Ni'in kazantmt icin uc fir; yontemi uygulanmtsttr. Lie testleri sonrasi Ni %72 ral1~ dtmanla kati partikulden cozeltiye gecirilebilmektedir.

... reaksiyona girerek klo-raminleri oluşturması içme suyu arıtım tesislerinde ste-rilizasyon ... Suyunhava ile temasına dayanan hava sıyırma prosesi ekonomik açıdan her ne ... bağlı olarak membran filtrasyon teknolojisi uygulama alanını, kimyasal, petrokimyasal, mineral, biyoteknoloji ...

Nowadays, with the environmental regulations becoming more and more stringent and growing pressure on the conservation of mineral resources, recycling has been gaining interest to develop economically‐viable refining technology. As the costs of the wastewater disposal increase (especially in the metal finishing industry) more emphasis is being placed on the recovery and recycling of valuable chemicals contained within these streams. In this study, a commercial plating plant filter waste (PPFW) was examined as an alternative source for the recovery of Ni as a nickel rich precipitate. The treatment tests performed by H2SO4 leaching method showed that dissolution amounts of metals such as Ni, Cu, Zn and Cr were affected by leaching time, temperature and acid concentration. Although the dissolution of metallic compounds almost was completed within the one hour of the extraction time, a rapid and higher dissolution amounts of Ni within the first minute of the leaching process (approximately 81% of the total extractable amount of Ni is extracted at the beginning period for 24 °C) indicated that the usage of this waste as a source of Ni has an advantage compared to Ni recovery from natural ores. A kinetic study carried out to clarify the dissolution of Ni, showed that a series of rate controlling steps, both chemical and diffusion reactions, was involved in the observed kinetic. After leaching, the filtered solution was subjected to two stages of controlled precipitation carried out at a pH of about 4–5.5 and about 8 to produce the solids containing non‐nickel and nickel respectively. The precipitation test performed by NaOH or MgO showed that almost all of the dissolved Ni ions were seperated from the solution. Based on the XRD and IR analysis, it was found out that a final precipitate, obtained by the use of NaOH, could be characterized as a disordered α‐Ni(OH) or as a blend of α and β‐Ni(OH)2, as for the MgO, the precipitate composed of mainly β‐(Ni(OH)2) phase and/or α‐(Ni(OH)2) phases. Santrauka Griežtėjant aplinkos apsaugos reikalavimams ir didėjant poreikiui taupyti mineralinius išteklius, siekiama plėtoti ekonomiškai perspektyvias rafinavimo technologijas. Ypač tai svarbu metalų apdirbimo pramonėje, nes didėja nuotekų šalinimo išlaidos. Išeitis būtų vertingų cheminių preparatų, susidarančių šiuose srautuose, pakartotinis panaudojimas ir perdirbimas. Šiame darbe nikeliavimo gamyklos atliekų filtras buvo išnagrinėtas kaip alternatyvus šaltinis nikeliui išgauti iš nikelio įsisotinusių nuosėdų. Apdorojimo testas atliktas taikant H2SO4 išplovimo metodą. Nustatyta, kad ištirpusių metalų, kaip antai: Ni, Cu, Zn, ir Cr, – kiekiai priklausė nuo plovimo trukmės, temperatūros ir rūgšties koncentracijos. Nors metalų junginiai beveik visai ištirpo per vieną plovimo valandą, iš proceso spartos ir didesnio ištirpusio Ni kiekio per pirmąją plovimo minutę (apytiksliai 81 % bendro išgauto Ni kiekio yra išgaunama pradiniu periodu esant 24 °C temperatūrai) galima spręsti, kad šių atliekų kaip Ni šaltinio panaudojimas yra pranašesnis, palyginti su Ni išgavimu iš natūralios rūdos. Atlikus kinetinį tyrimą Ni tirpumui nustatyti, paaiškėjo, kad proceso spartą lėmė cheminės ir difuzijos reakcijos. Filtruotasis tirpalas buvo nukreiptas nusodinti. Tai atlikta dviem etapais, kontroliuojant sąlygas, kai pH 4–5,5 ir vėliau pH 8,0 – atitinkamai išgaunant nuosėdas. Iš nusodinimo testo, atlikto su NaOH ar MgO, akivaizdu, kad beveik visi ištirpę nikelio jonai buvo išskirti iš tirpalo. Remiantis XRD ir IR analize, nustatyta, kad galutinės nuosėdos, susidarę naudojant NaOH, gali būti apibūdinamos kaip netvarkingas α-Ni(OH) arba kaip α ir β-Ni(OH)2 mišinys, o naudojant MgO, nuosėdos susidarė iš β-(Ni(OH)2 ) ir/arba α-(Ni(OH)2 ) fazių. Резюме В связи с ужесточением требований по охране окружающей среды и природных ресурсов заслуживает внимания вопрос о расширении применения экономически перспективных технологий по рафинированию. Это особенно касается металлургической промышленности в связи с увеличением расходов на удаление стоков, повторное применение и переработку ценных химических препаратов, оcтающихся в стоках. В статье описано исследование коммерческого фильтра по удалению отходов на заводе по обработке никеля в качестве альтернативного источника по получению никеля из осадков. Тест по обработке осадков, выполненный с применением метода вымывания H2SO4 , показал, что количество таких растворенных металлов, как Ni, Cu, Zn и Cr, зависит от времени вымывания, температуры и концентрации кислоты. Несмотря на то, что соединения металлов почти полностью растворились в течение одного часа вымывания, быстрое и большее количество растворенного в первую минуту вымывания Ni (приблизительно 81% от общего количества полученного Ni получают в начальный период при температуре 24 °C) показало, что применение этих отходов в качестве источника Ni имеет преимущество по сравнению с получением никеля из природной руды. Кинетическое исследование растворимости…

In addition to rock waste post-mining waste dump sites also contain coal grains justifying treating the dump sites as secondary mineral deposits. The article presents the results of laboratory tests aimed at determining the possibility of using suspending bed technology to separate a combustible substance from post-mining waste of a 4-0 mm grain size. The test results showed the possibility of obtaining good quality coal concentrates from coal waste of a grain size of 4-1 mm. The need for desludging and densifying the feed for the classifier with an autogenic suspending bed in the case of coal waste beneficiation in a wide 4-0 mm grain size justifies the use of a two-chamber device or two separate classifiers for narrower grain size classes. Concepts of systems for the recovery of fine coal grains providing the use of the classifier with autogenous suspending bed for the density distribution of feeds with high ash content are presented. The concepts were developed for beneficiation ...

In addition to rock waste post-mining waste dump sites also contain coal grains justifying treating the dump sites as secondary mineral deposits. The article presents the results of laboratory tests aimed at determining the possibility of using suspending bed technology to separate a combustible substance from post-mining waste of a 4-0 mm grain size. The test results showed the possibility of obtaining good quality coal concentrates from coal waste of a grain size of 4-1 mm. The need for desludging and densifying the feed for the classifier with an autogenic suspending bed in the case of coal waste beneficiation in a wide 4-0 mm grain size justifies the use of a two-chamber device or two separate classifiers for narrower grain size classes. Concepts of systems for the recovery of fine coal grains providing the use of the classifier with autogenous suspending bed for the density distribution of feeds with high ash content are presented. The concepts were developed for beneficiation ...

ABSTRACT In this study, rice husk ash (RHA) was used as a silica source for cordierite production. Two different groups of samples were prepared in order to achieve the synthesis of cordierite. In the first group (HS-0), kaolinite, alumina and talc were used as raw materials while in the second group (HS-1), active silica, obtained from rice husk, was added in powder composition instead of kaolinite. The rice husks were subjected to the chemical pretreatment with 2 M HCl, 5% solid at 25 °C before calcinations to increase silica contents of husk ash. The mixtures of raw materials were prepared in MgO:Al2O3:SiO2 molar ratio of 2:2:5 and ground in water media. The pressed samples were sintered in air at varying temperatures from 950 °C to 1350 °C and soaked for 1 h. It was found that the higher content of α-cordierite with a lower crystallization temperature could be obtained by using active silica instead of kaolinite in the mixture composition. The activation energy of transition μ → α-cordierite was calculated to be 205 kJ/mol for the active silica doped sample.

... 1^, Cü4""1", Cd"1"4" ve Hg"*""1" için klinoptilolit değişim kapasitesi sırasıyla 0.7540, 0.6984, 0.6980 ve 0.5530 meg/g olarak ... sınıflandırılmıştır Sınıf landırma dışmda fiziksel ve kimyasal aktivasyonda künoptilolitin iyon değişim kapasitesi üzerinde etkilidir (Klive ve Semmens 1980 ...

... ISBN 90 5410 8290 Technological evaluation of Turkish sepiolites H. Kurama, D. Oz & M. Kaya ... external and intracrystalline channels and easily desorped while non-polar organic materialscan penetrate only ... Regresyondaki Tiirkiye madencilik sektorii i? in yeni umut: Sepiolit. ...