scholarly journals Decomposition of ferronickel slag through alkali fusion in the roasting process

2021 ◽  
Vol 2 (12 (110)) ◽  
pp. 44-51
Author(s):  
Wahyu Mayangsari ◽  
Isma Nur Avifah ◽  
Agus Budi Prasetyo ◽  
Eni Febriana ◽  
Ahmad Maksum ◽  
...  
Keyword(s):  
Smelting Process ◽  
Process Conditions ◽  
Potential Hazard ◽  
Icp Oes ◽  
Alkali Fusion ◽  
Roasting Process ◽  
Ferronickel Slag ◽  
Nickel Smelting ◽  
Mg Content

Ferronickel slag is a by-product of the nickel smelting process. Recycling of ferronickel slag is required since it contains valuable elements besides its potency to pollute the environment. In order to take advantage of the valuable materials and reducing the potential hazard, beneficiation of ferronickel slag is essential. Alkali fusion of ferronickel slag using Na2CO3 in the roasting process was carried out. This study aims to determine the decomposition of the mixture of ferronickel slag-Na2CO3 in the roasting process. Roasting temperature and time were 800–1,000 °C and 60‒240 minutes, respectively. Characterizations of the ferronickel slag were conducted by XRF, ICP-OES, XRD and SEM-EDS. Meanwhile, roasted products were characterized using ICP-OES, XRD and SEM-EDS. Characterization of the ferronickel slag indicates that Mg and Si are the main elements followed by Fe, Al and Cr. Moreover, olivine is detected as the main phase. The roasting process caused percent weight loss of the roasted products, which indicates decomposition occurred and affected the elements content, phases and morphology. The roasting process at about 900 °C for 60 minutes is a preferable decomposition base on the process conditions applied and the change of elements content. Aluminum (Al) and chromium (Cr) content in the roasted products upgraded significantly compared to iron (Fe) and magnesium (Mg) content. Olivine phase transforms to some phases, which were bounded with the sodium compound such as Na2MgSiO4, Na4SiO4 and Na2CrO4. The rough layer is observed on the surface of the roasted product as a result of the decomposition process. It indicates that liquid-solid mass transfer is initiated from the surface

scholarly journals Merits of microwave plasmas for optical emission spectrometry – characterization of an axially viewed microwave-sustained, inductively coupled, atmospheric-pressure plasma (MICAP)

2020 ◽  
Vol 35 (10) ◽  
pp. 2369-2377
Author(s):  
Helmar Wiltsche ◽  
Matthias Wolfgang
Keyword(s):  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Optical Emission ◽  
Plasma Source ◽  
Optical Emission Spectrometry ◽  
Emission Spectrometry ◽  
Icp Oes ◽  
Microwave Plasmas ◽  
Inductively Coupled

The MICAP is a microwave driven plasma source employing nitrogen as the plasma gas. In this work we compare LODs and LOQs obtained in axial viewing with those obtained by ICP-OES and evaluate the effect of air instead of nitrogen as the plasma gas.

Physico-Chemical Characterization of Alumina Sols Prepared From Aluminum Alcoxides

1986 ◽  
Vol 73 ◽  
Author(s):  
William L. Olson
Keyword(s):  
Room Temperature ◽  
Gel Filtration ◽  
Chemical Characterization ◽  
Process Conditions ◽  
Chemical Processing ◽  
Rotary Evaporation ◽  
Physico Chemical ◽  
Elution Curves ◽  
Alumina Sol

ABSTRACTAlumina sols derived from aluminum sec-butoxide (Yoldas) were characterized. The distribution of the polymer sizes within the sol, determined by gel filtration chromatography (GFC), was found to be dramatically affected by small changes in the chemical processing or preparative procedure. Aging the sol at room temperature for two weeks produced no significant change in the GFC elution curves of the alumina sol. Sols with a “milky” appearance were found to exhibit a wider distribution of polymers by GFC than transparent sols. Rotary evaporation of the sol followed by redissolution of the residue was found to change the polymer size distribution described by the gel filtration elution curves. These observations coupled with 27Al NMR spectroscopy and viscometry measurements were used to elucidate the effects of process conditions and aging on the molecular structure of the sol.

scholarly journals Thermal regeneration of waste foundry phenolic sand in a lab scale fluidized bed

2018 ◽  
Vol 23 (1) ◽  
Author(s):  
Johny Anderson Severo ◽  
Regina Célia Espinosa Modolo ◽  
Carlos Alberto Mendes Moraes ◽  
Flávia Schwarz Franceschini Zinani
Keyword(s):  
Fluidized Bed ◽  
Regeneration Process ◽  
Process Conditions ◽  
Loss On Ignition ◽  
Molding Process ◽  
Partial Removal ◽  
Thermal Regeneration ◽  
Previously Treated ◽  
Regeneration Efficiency

ABSTRACT Improper disposal of sand used in molding processes after casting increases logistical costs and environmental impact because of the presence of the phenolic resin in its composition. The regeneration process of waste foundry phenolic sand (WFPS) aims to recycle this material. As mechanical regeneration methods are not efficient to guarantee 100% cleaning of the sand grains and their use again in the molding process, this work investigated the efficiency of a method of thermal regeneration of this type of residue that can be employed as a complementary procedure. A laboratory-scale fluidized bed reactor was designed and built to regenerate WFPS that was previously treated by a mechanical method. The methodology used to design and construct the fluidized bed prototype is described, as well as the characterization of the residual, the standard clean sand and the regenerated sand. The results of the thermal regeneration in the fluidized bed were very satisfactory with respect to the regeneration efficiency. For the nine process conditions tested, loss on ignition values were reduced when compared to standard clean sand. This study presents the advantages of a combination of two processes, mechanical and thermal regeneration, which allows to reduce the time and eventual temperature of resin removal due to the partial removal of the resin layer or its weakening during the mechanical regeneration process. Of the nine process conditions tested, six had loss on ignition values below the CSS. Thus, the thermal regeneration in the fluidized bed results was quite satisfactory in relation to the regeneration efficiency.

scholarly journals Characterization of interactions between natural organic matter and metals by tangential-flow ultrafiltration and ICP OES

2011 ◽  
Vol 22 (1) ◽  
pp. 98-103 ◽  
Author(s):  
Adilson C. Santos ◽  
Luciane P. C. Romão ◽  
Valéria L. de Oliveira ◽  
Mônica C. Santos ◽  
Carlos A. B. Garcia ◽  
...  
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Icp Oes ◽  
Tangential Flow

Growth and Characterization of 2″ 6H-Silicon Carbide

1999 ◽  
Vol 572 ◽  
Author(s):  
Erwin Schmitt ◽  
Robert Eckstein ◽  
Martin Kölbl ◽  
Amd-Dietrich Weber
Keyword(s):  
Silicon Carbide ◽  
Boundary Conditions ◽  
Growth Process ◽  
Defect Density ◽  
Crystal Quality ◽  
Process Conditions ◽  
Thermal Boundary Conditions ◽  
Sublimation Growth ◽  
Defect Densities

ABSTRACTFor the growth of 2″ 6H-SiC a sublimation growth process was developed. By different means of characterization crystal quality was evaluated. Higher defect densities, mainly in the periphery of the crystals were found to be correlated to unfavourable process conditions. Improvement of thermal boundary conditions lead to a decreased defect density and better homogeneity over the wafer area.

Preparation and characterization of porous ceramics from nickel smelting slag and metakaolin

2020 ◽  
Vol 46 (4) ◽  
pp. 4581-4586 ◽  
Author(s):  
Qisheng Wu ◽  
Qiujing Chen ◽  
Zichen Huang ◽  
Bin Gu ◽  
Huajun Zhu ◽  
...  
Keyword(s):  
Porous Ceramics ◽  
Smelting Slag ◽  
Nickel Smelting

scholarly journals Synthesis and characterization of a high performance polycarboxylic acid water reducing agent

2020 ◽  
Vol 198 ◽  
pp. 01018
Author(s):  
Qiong Yan ◽  
Liangke Yao ◽  
Yongzhong Xia ◽  
Shishan Liu ◽  
Lingcong Chen
Keyword(s):  
High Performance ◽  
Chain Transfer ◽  
Reducing Agent ◽  
Acid Water ◽  
Synthesis Process ◽  
Process Conditions ◽  
Polycarboxylic Acid ◽  
Synthetic Process ◽  
Working Performance

The optimal synthesis process conditions of polycarboxylic acid water reducers were investigated and characterized by infrared spectroscopy as well as GPC using high performance polycarboxylic acid water reducers synthesized by isoproterenol polyoxyethylene ether polymerized with acrylic acid and introducing unsaturated monomeric dibasic ester. The results showed that the optimum synthetic process conditions were as follows: acid-ether ratio of 3.0:1, amount of binary ester as 2.8% of monomer mass, amount of initiator as 0.35% of monomer mass, amount of chain transfer agent as 0.35% of monomer mass; the initial slump and initial expansion of the concrete of the synthetic water-reducing agent PCE-H were greater than those of the commercially available polycarboxylic acid water-reducing agent PCE-W, and the working performance of the concrete was better. PCE-H also has no adverse effect on strength.

Characterization of effective permeability of prepreg fibers under autoclave molding process conditions using process model simulations

2020 ◽  
Vol 112 (1) ◽  
pp. 1-7
Author(s):  
Prosenjit Maji ◽  
Arpit Jain ◽  
Nibedita Dutta ◽  
Ahmed Ovais Siddiqui ◽  
Debdarsan Niyogi ◽  
...  
Keyword(s):  
Process Model ◽  
Effective Permeability ◽  
Process Conditions ◽  
Molding Process ◽  
Model Simulations
Sign in / Sign up

Export Citation Format

Share Document