Study of transfer of minor elements during ironmaking by neutron activation analysis

Auto junk markets have been observed to be one of the sources of heavy metal pollution in soils and water. The aim of this study is to assess the level of heavy metal pollution within two largest auto junk markets in Nigeria at Obosi and Nnewi, respectively. Twenty-four (24) composite soil samples including the background (control) samples at 0-15 and 15-30 cm depths, and six (6) water samples were randomly collected. Samples were properly digested and subjected to spectroscopic analysis using atomic absorption spectrometer (AAS) for trace metals. Seven selected heavy metals (Fe, Cu, Ni, Cr, Zn, Mn, and Pb) were analyzed in three replicates. The results revealed that trace metals' concentration (ppm) in 0-30 cm depth are well above the background values with Ni in excess of international standard. Metal enrichment is in the order of Ni > Fe >> Zn > Cu > Mn > Pb > Cr. Results of heavy metals obtained from the water samples revealed that Mn, Fe, Cu, and Ni are in excess when compared with the World Health Organization (WHO 2009) and Nigerian Standard for Drinking Water Quality (NSDWQ 2007) standards for drinking water. The pollution load index and contamination factor reveals that the soil around the automobile junk markets are at various stages of pollution with heavy metals, ranging from slight contamination to severe pollution. Water around the automobile junk markets are not advisable for domestic uses, as a result of its heavy metal contents, which are connected to the effects of industrial waste accumulation and indiscriminate domestic waste disposal as suggested by the principal component analysis.

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“…5 and 6) (Ene et al 2009). Many reasons have been given for this decrease in heavy metal concentration with increase in depth.…”

Section: Resultsmentioning

confidence: 98%

Analysis of heavy metals’ contamination in soils and water at automobile junk markets in Obosi and Nnewi, Anambra State, Southeastern Nigeria

2015

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“…However, they are dangerous due to the unstable subsoil. It was found that the radioactivity of iron slag in Slovakia [5,6] and in Romania [7] does not exceed the limit permitted by the legislation.…”

Section: Introductionmentioning

confidence: 97%

The load dependence of the micro-hardness of the blast furnace slag

et al. 2020

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Deposits of old blast-furnace slag are an environmental problem. The slag’s hardness is an important for calculation of the energy cost for crushing and grinding process. Due to its porosity, measurement of the (macro) hardness is. To adapt the dimensions of the indentations to the character of the slag, it is necessary to apply loads in the range of micro-hardness. The purpose of this paper is to evaluate the influence of load on the micro-hardness - the Indentation Size Effect (ISE) using Meyer’s, Hays-Kendall and PSR methods. ISE for all samples is “normal”, the slag’s basicity affects micro-hardness and ISE.

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“…X-rays fluorescence (XRF) is an analytical method widely used for the quantitative and qualitative determination of the elementary chemical composition of samples with a variable number of elements. The great advantage of this method of analysis results from the fact that the samples, mainly the metallic ones and the powders, are not destroyed during the analysis and do not require a prior chemical treatment [3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

XRF assessment of microcomposition and basicity index of metallurgical slags

Ene

Szabo

2021

Ann_UGAL_Math_Phys_Mec

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Slag analysis is very important in maintaining the quality standards of metallurgical processes. The chemical structure and the physical features of slag play a very important role in the management of blast furnace (BF) processes, favouring the development of the decreasing reactions and acting as a thermoregulator of the furnace by the adjustment of heat transmission through the metallic bath. In this paper, the following ranges of oxides concentrations were obtained in BF slags by X-ray fluorescence with wavelength dispersion (WXRF): 32.29-35.56% SiO2; 42.41-44.1 % CaO; 12.20-15.63% Al2O3; 0.40-0.85% MnO; 5.38-6.17% MgO; 0.45-0.69% FeO. The calculated basicity index of slags varied between 1.031 and 1.103, denoting the acidic character of slags.

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Study of transfer of minor elements during ironmaking by neutron activation analysis

Cited by 9 publications

References 20 publications

Analysis of heavy metals’ contamination in soils and water at automobile junk markets in Obosi and Nnewi, Anambra State, Southeastern Nigeria

Analysis of heavy metals’ contamination in soils and water at automobile junk markets in Obosi and Nnewi, Anambra State, Southeastern Nigeria

The load dependence of the micro-hardness of the blast furnace slag

XRF assessment of microcomposition and basicity index of metallurgical slags

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