Utilization of pyrite ash wastes by pelletization process

Tuğrul, Nurcan; Derun, Emek Möröydor; Pişkin, Mehmet Burçin

doi:10.1016/j.powtec.2007.01.012

Cited by 35 publications

(17 citation statements)

References 6 publications

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“…[3][4][5][6] To date, an increasing amount of pyrite cinder containing low nonferrous metals and high grade of iron is used as blast furnace burden by sintering and pelletizing. [7][8][9] However, sintering and pelletizing requires high iron grade, especially oxidized pellets (the grade of iron should be more than 63%). Also, the nonferrous metal content in pyrite cinder must be very low because it is hard to remove the nonferrous metals by sintering and pelletizing.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Prereduced Pellets by Pyrite Cinder Containing Nonferrous Metals with High Temperature Chloridizing-reduction Roasting Technology

2014

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Pyrite cinder contains considerable amount of nonferrous metals and the iron grade of pyrite cinder is low for blast furnace burden, so processing the pyrite cinder has become a significant issue for the utilization of valuable resources and environmental protection. In this study, a technique with high temperature chloridizing-reduction roasting is presented in aim to remove nonferrous metals from iron and produce blast furnace burden with high quality. The effects of chloridizing temperature and time, chlorinating agent dosage, reduction temperature and time are investigated. The optimum process parameters are determined as follows: chloridizing at 1 125°C for 10 min, CaCl2 dosage of 2% and reduction at 1 100°C and the coal/cinder ratio of 2.5 for 40 min. Under these conditions, the compressive strength of prereduced pellets is 1147N per pellet, the metallization degree is 84.53% and the removal rates of Cu, Pb and Zn are 37.87%, 99.31% and 80.20%, respectively.

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Section: Introductionmentioning

confidence: 99%

Preparation of Prereduced Pellets by Pyrite Cinder Containing Nonferrous Metals with High Temperature Chloridizing-reduction Roasting Technology

2014

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“…At the Eti Mine Works in Bandırma, Turkey, where PA is produced, it is generally landfilled or dumped into the sea, and is thus a potential pollution source (Tugrul et al 2007). Alp et al (2009) demonstrated that PA can be used as an iron source in cement production.…”

Section: Introductionmentioning

confidence: 99%

黄铁矿灰渣去除溶解态砷

Türk

2016

Mine Water Environ

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Pyrite ash (PA), a waste produced during the roasting of pyrite ores to produce sulfuric acid, was studied as a potential adsorbent for removing arsenic (As) from groundwater. The collected pyrite ash waste samples contained [86 % iron (as Fe 2 O 3 ). The results indicate that adsorption of As by PA was only slightly affected by initial pH at pH B 9. Arsenate removal efficiency increased with the amount of adsorbent added over the range of 0.1-50 g/L. The As(V) removal increased with time, and 79 % removal was achieved within 1 h. Moreover, there was no significant change in As concentrations after 24 h. The adsorption process was best described by a second-order kinetic model. The adsorption of As(V) onto the PA was found to have followed the Langmuir isotherm. In batch studies, the maximum As(V) removal efficiency was 97 % at an adsorbent dose of 10 g/L, with an initial As(V) concentration of 300 lg/L. Thus, the PA was shown to be a suitable sorbent, reducing As from an initial level of 600 to\10 lg/L As(V), i.e., below the WHO limit for drinking water.

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“…After the utilization of this waste material in a heterogeneous Fenton process, generated sludge is mainly composed of the used pyrite cinder. As pyrite cinder also contains traces of toxic/hazardous heavy metals such as Cu, Zn, Pb, and As [4][5][6], generated sludge may be toxic and cannot be disposed of directly without previous treatment.…”

Section: Introductionmentioning

confidence: 99%

Treatment of pyrite cinder sludge after usage in dye degradation: Feasibility study

Kerkez¹,

Bečelić‐Tomin²,

Dalmacija³

et al. 2016

Zas Mat

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Over the last couple of years greener concept in hazardous waste management is gaining increasing relevance. This term refers to the processes and activities that have little or negligible impact on the environment. The aim of this study is to systematically quantify the physical and chemical properties of the solidified/stabilized (S/S) sludge generated in dye effluent treatment, when pyrite cinder is used as catalytic iron source in the modified heterogeneous Fenton process. S/S treatment was performed by using two clay materials (kaolinite and bentonite) and lime in order to immobilize Cu, Pb and Zn present in the sludge. Microwave assisted sequential extraction procedure was employed to assess potential metal mobility and risk to the environment. In order to determine the long-term behaviour of the S/S mixtures, the semi-dynamic ANS 16.1 leaching test was performed. S/S effectiveness was evaluated by measuring the cumulative fractions of leached metals, effective diffusion coefficients -De and leachability indices -LX. Scanning electron microscope (SEM) and X-ray diffraction (XRD) were implemented to elucidate the mechanisms responsible for immobilization of the

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Utilization of pyrite ash wastes by pelletization process

Cited by 35 publications

References 6 publications

Preparation of Prereduced Pellets by Pyrite Cinder Containing Nonferrous Metals with High Temperature Chloridizing-reduction Roasting Technology

Preparation of Prereduced Pellets by Pyrite Cinder Containing Nonferrous Metals with High Temperature Chloridizing-reduction Roasting Technology

黄铁矿灰渣去除溶解态砷

Treatment of pyrite cinder sludge after usage in dye degradation: Feasibility study

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