Optimization of the comminution process in the industrial manufacture of powder from steel swarf

1985 ◽  
Vol 24 (4) ◽  
pp. 259-262
Author(s):  
V. L. �sikman ◽  
S. S. Kiparisov ◽  
O. V. Padalko
Keyword(s):  
Comminution Process ◽  
Industrial Manufacture ◽  
Steel Swarf

scholarly journals Application of Electrocoagulation with a New Steel-Swarf-Based Electrode for the Removal of Heavy Metals and Total Coliforms from Sanitary Landfill Leachate

2021 ◽  
Vol 11 (11) ◽  
pp. 5009
Author(s):  
Mayk Teles de Oliveira ◽  
Ieda Maria Sapateiro Torres ◽  
Humberto Ruggeri ◽  
Paulo Scalize ◽  
Antonio Albuquerque ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Landfill Leachate ◽  
Lower Cost ◽  
Sanitary Landfill ◽  
Leachate Treatment ◽  
Removal Of Heavy Metals ◽  
Waste Characteristics ◽  
Electrode Passivation ◽  
Steel Swarf ◽  
Sanitary Landfill Leachate

Sanitary landfill leachate (LL) composition varies according to climate variables variation, solid waste characteristics and composition, and landfill age. Leachate treatment is essentially carried out trough biological and physicochemical processes, which have showed variability in efficiency and appear a costly solution for the management authorities. Electrocoagulation (EC) seems a suitable solution for leachate treatment taking into account the characteristics of the liquor. One of the problems of EC is the electrode passivation, which affects the longevity of the process. One solution to this problem could be the replacement of the electrode by one made of recyclable material, which would make it possible to change it frequently and at a lower cost. The objective of the present work was to evaluate the removal of heavy metals (As, Ba, Cd, Cr, Cu, Fe, Pb, Mn, Ni, Se and Zn) and coliforms from a LL by EC using electrodes made from steel swarf (SfE) up to 8 h. Removal efficiencies of detected heavy metals were 51%(Cr), 59%(As), 71%(Cd), 72%(Zn), 92%(Ba), 95%(Ni) and >99%(Pb). The microbial load of coliforms in leachate was reduced from 10.76 × 104 CFU/mL (raw leachate) to less than 1 CFU/mL (after treatment with SfE) (i.e., approximately 100% reduction). The use of SfE in EC of LL is very effective in removing heavy metals and coliforms and can be used as alternative treatment solution for such effluents.

scholarly journals Grain-based DEM for Particle Bed Comminution

Minerals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 306
Author(s):  
Michael Klichowicz ◽  
Holger Lieberwirth
Keyword(s):  
Grain Size ◽  
Discrete Element Method ◽  
Specific Energy ◽  
Coarse Particles ◽  
Full Understanding ◽  
Real Experiment ◽  
Helpful Tool ◽  
Ore Processing ◽  
Comminution Process ◽  
Particle Bed

The comminution at the grain size level for liberating the valuable minerals usually requires the highest size-specific energy. Therefore, a full understanding of the comminution process at this level is essential. Models based on the Discrete Element Method (DEM) can become a helpful tool for this purpose. One major concern, however, is the missing representativeness of mineral microstructures in the simulations. In this study, a method to overcome this limitation is presented. The authors show how a realistic microstructure can be implemented into a particle bed comminution simulation using grain-based models in DEM (GBM-DEM). The improved algorithm-based modeling approach is exemplarily compared to an equivalent real experiment. The simulated results obtained within the presented study show that it is possible to reproduce the interfacial breakage observed in real experiments at the grain size level. This is of particular interest as the aim of comminution in mineral processing is not only the size reduction of coarse particles, but often an efficient liberation of valuable components. Simulations with automatically generated real mineral microstructures will help to further improve the efficiency of ore processing.

The Intelligent Clamping Fixture

2012 ◽  
Vol 152-154 ◽  
pp. 1670-1674 ◽  
Author(s):  
Miroslava Kostalova ◽  
Peter Košťál
Keyword(s):  
Manufacturing Systems ◽  
Present Situation ◽  
Intelligent Manufacturing ◽  
Intelligent Manufacturing Systems ◽  
Industrial Manufacture ◽  
New Generation

Present situation in the industrial manufacture has brought new trends in the kind of flexibility and intelligence. That means new generation of intelligent manufacturing systems. New generation of clamping fixtures is represented by group of clamping fixtures which can be used in intelligent manufacturing systems.

Effect of the Milling Time and Addition of a Grinding Agent of Quasicrystalline Powder Based on AlCuFeB Alloys

2012 ◽  
Vol 727-728 ◽  
pp. 324-328
Author(s):  
Danielle Guedes de Lima Cavalcante ◽  
T.P.S. Barros ◽  
B.A.S.G. Lima ◽  
Tibério Andrade dos Passos ◽  
S.J.G. de Lima ◽  
...  
Keyword(s):  
High Hardness ◽  
Icosahedral Phase ◽  
Matrix Composites ◽  
Low Friction ◽  
Particle Size Reduction ◽  
Crystalline Materials ◽  
Brittle Behavior ◽  
New Class ◽  
Comminution Process ◽  
The Stability

Quasicrystalline (QC) materials represent a new class of alloys differing from amorphous and crystalline materials due to quasicrystalline periodicity and therefore unusual properties. Applications of quasicrystals range from surface coatings, thin films to reinforcements of ductile matrix composites such aluminum and, more recently, polymers. Quasicrystalline alloys show fundamentally different behavior compared to crystalline alloys even when their compositions are very similar, including low friction coefficient, high hardness and high brittleness. Due to this brittle behavior there are some limitations with respect to what methods can be used to process QC materials restricting their applications to powder form. One of the techniques for particle size reduction is mechanical milling which, however may lead to destabilization of the icosahedral phase. Therefore, there is a need to study the stability of quasicrystalline alloys during this comminution process. In the present study, AlCuFeB alloys were milled with the aid of a grinding agent that helps reduce overheating and thus controlling the QC powder stability. It was found that QC phase was destabilized after 10 h while the addition of a grinding agent led to milling times of 20 h without destabilizing the QC phase.

Complementary Industries

2019 ◽  
pp. 81-94
Author(s):  
Karl Raitz
Keyword(s):  
High Capacity ◽  
White Oak ◽  
Maritime Shipping ◽  
Industrial Manufacture ◽  
Oak Barrels

Kentucky distillers bought white oak barrels from local coopers or established dedicated cooperages near their works. Coopers worked in independent shops as owners or employees, in larger urban commercial shops with a dozen or more employees, or in dedicated shops owned by distilleries. Stills were initially made by self-taught coppersmiths, but skilled professionals dominated the industrial manufacture of high-capacity copper distilling equipment. Copper was comparatively rare and expensive and was often recycled from naval and maritime shipping or vessel and machinery manufacturers.

A new method for simulation of comminution process in jet mills

2019 ◽  
Vol 343 ◽  
pp. 867-879 ◽  
Author(s):  
Viktor Rodnianski ◽  
Avi Levy ◽  
Haim Kalman
Keyword(s):  
New Method ◽  
Comminution Process

Formation of Biogenic Amines throughout the Industrial Manufacture of Red Wine

2006 ◽  
Vol 69 (2) ◽  
pp. 397-404 ◽  
Author(s):  
Á. MARCOBAL ◽  
P. J. MARTÍN-ÁLVAREZ ◽  
M. C. POLO ◽  
R. MUÑOZ ◽  
M. V. MORENO-ARRIBAS
Keyword(s):  
Amino Acids ◽  
Sulfur Dioxide ◽  
Biogenic Amines ◽  
Biogenic Amine ◽  
Alcoholic Fermentation ◽  
Red Wine ◽  
Malolactic Fermentation ◽  
Industrial Manufacture ◽  
Amino Acid Precursors ◽  
Wine Aging

Changes in biogenic amines (histamine, methylamine, ethylamine, tyramine, phenylethylamine, putrescine, and cadaver-ine) were monitored during the industrial manufacture of 55 batches of red wine. The origin of these amines in relation to must, alcoholic fermentation, malolactic fermentation, sulfur dioxide addition, and wine aging and the interactions between amines and their corresponding amino acids and pH were statistically evaluated in samples from the same batches throughout the elaboration process. Some amines can be produced in the grape or the musts (e.g., putrescine, cadaverine, and phenylethylamine) or can be formed by yeast during alcoholic fermentation (e.g., ethylamine and phenylethylamine), although quantitatively only very low concentrations are reached in these stages (less than 3 mg/liter). Malolactic fermentation was the main mechanism of biogenic amine formation, especially of histamine, tyramine, and putrescine. During this stage, the increase in these amines was accompanied by a significant decline in their amino acid precursors. Significant correlations between biogenic amine formation and the disappearance of their corresponding amino acids were observed, which clearly supports the hypothesis that malolactic bacteria are responsible for accumulation of these amines in wines. No increase in the concentration of biogenic amines was observed after SO2 addition and during wine aging, indicating that sulfur dioxide prevents amine formation in subsequent stages.

scholarly journals Kinetics of Whey Protein Glycation Using Dextran and the Dry-Heating Method

Foods ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 528 ◽  
Author(s):  
Na Li ◽  
Abhiram Arunkumar ◽  
Mark R. Etzel
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Whey Protein ◽  
Chromatographic Analysis ◽  
Sodium Dodecyl ◽  
Protein Glycation ◽  
Heating Method ◽  
Glycated Protein ◽  
Industrial Manufacture ◽  
Dodecyl Sulfate ◽  
Dry Heating

Glycation of proteins by polysaccharides via the Maillard reaction improves the functional properties of proteins in foods, such as solubility, heat stability, emulsification, foaming, and gelation. Glycation is achieved by either the dry heating or the wet heating method, and considerable research has been reported on the functionality of the reaction mixture as tested in foods. While the characteristics of the glycates in foods have been well studied, the kinetics and equilibrium yield of the protein-polysaccharide glycation reaction has received little attention. Industrial manufacture of the glycates will require understanding the kinetics and yield of the glycation reaction. This work examined the glycation of whey protein isolate (WPI) and glycomacropeptide (GMP) by using dextran and the dry-heating method at 70 °C and 80% relative humidity. The disappearance of un-glycated protein and the creation of glycated protein were observed using chromatographic analysis and fluorescence laser densitometry of sodium dodecyl sulfate-polyacrylamide gels. Data were fit using a first-order reversible kinetic model. The rate constants measured for the disappearance of un-glycated protein by sodium dodecyl sulfate-polyacrylamide (SDS-PAGE) (k = 0.33 h−1) and by chromatographic analysis (k = 0.38 h−1) were not statistically different from each other for WPI-dextran glycation. Dextran glycation of GMP was slower than for WPI (k = 0.13 h−1). The slower rate of glycation of GMP was attributed to the 50% lower Lys content of GMP compared to WPI. Yield for the dry-heating dextran glycation method was 89% for WPI and 87% for GMP. The present work is useful to the food industry to expand the use of glycated proteins in creating new food products.

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