scholarly journals Mineralogical and Chemical Specificity of Dusts Originating from Iron and Non-Ferrous Metallurgy in the Light of Their Magnetic Susceptibility

Minerals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 216
Author(s):  
Mariola Jabłońska ◽  
Marzena Rachwał ◽  
Małgorzata Wawer ◽  
Mariola Kądziołka-Gaweł ◽  
Ewa Teper ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Chemical Composition ◽  
Ferrous Metallurgy ◽  
Inductively Coupled Plasma ◽  
Ferrous Metal ◽  
Optical Emission ◽  
Inductively Coupled ◽  
Mineral Phases ◽  
Metallurgical Wastes ◽  
Production Stages

This study aims at detailed characteristics and comparison between dusts from various iron and non-ferrous metal production processes in order to identify individual mineral phases, chemical composition, and their influence on the values of magnetic susceptibility. Various analytical methods used include inductively coupled plasma optical emission spectroscopy, X-ray diffraction, scanning electron microscopy, and Mössbauer spectroscopy integrated with magnetic susceptibility measurements and thermomagnetic analysis. Metallurgical wastes that have arisen at different production stages of iron and non-ferrous steel are subjected to investigation. The analyzed dust samples from the iron and non-ferrous metallurgy differ in terms of magnetic susceptibility as well as their mineral and chemical composition. The research confirmed the presence of many very different mineral phases. In particular, interesting phases have been observed in non-ferrous dust, for example challacolloite, which was found for the first time in the dusts of non-ferrous metallurgy. Other characteristic minerals found in non-ferrous metallurgy dusts are zincite, anglesite, and lanarkite, while dusts of iron metallurgy contain mostly metallic iron and iron-bearing minerals (magnetite, hematite, franklinite, jacobsite, and wüstite), but also significant amounts of zincite and calcite.

scholarly journals Element Vaporization of Ti-6Al-4V Alloy during Selective Laser Melting

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 435 ◽  
Author(s):  
Guohao Zhang ◽  
Jing Chen ◽  
Min Zheng ◽  
Zhenyu Yan ◽  
Xufei Lu ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Selective Laser Melting ◽  
Inductively Coupled Plasma ◽  
Energy Input ◽  
Laser Energy ◽  
Optical Emission ◽  
Enskog Theory ◽  
Laser Melting ◽  
Inductively Coupled ◽  
Optical Emission Spectrometer

The present study aims to reveal the mechanism of element vaporization of Ti-6Al-4V alloy during selective laser melting (SLM). The equations of Redlich–Kister and the thermodynamics principles were employed to calculate the vaporization thermodynamics, which contributes to the obtaining the vaporization kinetic based on the Chapman-Enskog theory and the diffusion model. According to the achieved vaporization model, the elements with the most prominent tendency and flux to vaporize were distinguished. Moreover, the effect of the process parameters on the vaporization of Al and Ti is experimentally investigated using inductively coupled plasma optical emission spectrometer (ICP) technology. The analyzed results of the chemical composition of the powders and builds show a great agreement with the kinetic results calculated by the vaporization model. Notably, the element vaporization can be curbed by regulating the laser energy input.

scholarly journals Determination of the chemical composition of the residual powder in order to identify the source of release

2021 ◽  
Vol 342 ◽  
pp. 03004
Author(s):  
Sonia Niculina Şuvar ◽  
Maria Prodan ◽  
Andrei Szollosi-Moţa ◽  
Irina Nălboc ◽  
Aurelian Nicola
Keyword(s):  
Chemical Composition ◽  
Inductively Coupled Plasma ◽  
Safety Data ◽  
Optical Emission ◽  
Pollutant Emissions ◽  
Emission Spectrometry ◽  
Infrared Spectrometry ◽  
Inductively Coupled ◽  
Home Heating ◽  
Two Samples

Particles in suspension come mainly from pollutant emissions generated by industry, traffic, home heating, etc. Due to these particles, various diseases can occur, such as lung cancer, asthma, cardiovascular diseases. An important problem is represented by the particles with an aerodynamic diameter of less than 10 micrometers, which pass through the nose and throat and enter the alveoli of the lungs causing inflammation and intoxication. This paper aimed to establish the chemical composition of residual powders in a production hall from the automotive industry, to identify the source of release. For this, the infrared spectrometry (FTIR) method, the inductively coupled plasma optical emission spectrometry (ICP-OES) method, and the x-ray spectrometry (XRF) method were used. Two samples of dust from different locations of the production hall were analyzed, as well as a substance used in the process, to determine whether the dust came from its use. A series of safety data sheets for substances used in the technological process was also analyzed. The results obtained from the qualitative and quantitative determinations were evaluated considering the chemical composition of all substances involved, leading to the identification of the residual dust release source.

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