Magnesium Removal from Secondary Aluminum Melts in Reverberatory and Rotary Furnaces

2012 ◽  
pp. 584-596
Author(s):  
Eulogio Velasco ◽  
Jose Nino ◽  
Marcos Cardoso
Keyword(s):  
Secondary Aluminum ◽  
Magnesium Removal

scholarly journals Friction-Induced Recycling Process for User-Specific Semi-Finished Product Production

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 663
Author(s):  
Thomas Borgert ◽  
Werner Homberg
Keyword(s):  
High Efficiency ◽  
Research Work ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
Efficient Production ◽  
Secondary Aluminum ◽  
Shape Accuracy ◽  
Aluminum Chips ◽  
Spinning Process ◽  
Complex Parts

Modern forming processes often allow today the efficient production of complex parts. In order to increase the sustainability of forming processes it would be favorable if the forming of workpieces becomes possible using production waste. At the Chair of Forming and Machining Technology of the Paderborn University (LUF) research is presently conducted with the overall goal to produce workpieces directly from secondary aluminum (e.g., powder and chips). Therefore, friction-based forming processes like friction spinning (or cognate processes) are used due to their high efficiency. As a pre-step, the production of semi-finished parts was the subject of accorded research work at the LUF. Therefore, a friction-based hot extrusion process was used for the full recycling or rework of aluminum chips into profiles. Investigations of the recycled semi-finished products show that they are comparable to conventionally produced semi-finished products in terms of dimensional stability and shape accuracy. An analysis of the mechanical properties of hardness and tensile strength shows that a final product with good and homogeneously distributed properties can be produced. Furthermore, significant correlations to the friction spinning process could be found that are useful for the above-mentioned direct part production from secondary aluminum.

Production Levels of Bauxite and Aluminum: Global Historical Survey (1850–2015)

2019 ◽  
Author(s):  
Charles Christopher Sorrell ◽  
Pramod Koshy
Keyword(s):  
Primary Aluminum ◽  
Data Sets ◽  
List Type ◽  
Historical Survey ◽  
Secondary Aluminum ◽  
Comprehensive Data ◽  
Conversion Rates ◽  
Global Data

The present work provides a concise examination of the historical global production levels of bauxite, primary aluminum, and secondary aluminum from 1850 to 2015. It also provides a contextual background to these data by summarizing the main etymological, technical, and commercial developments throughout most of this period. It further includes comprehensive data for the pricing of primary aluminum in both historical and 2015 dollars on the basis of economy cost. The syntheses of the data include the following: Global production levels of bauxite based on three data setsGlobal production levels of primary aluminum based on three data setsGlobal production levels of secondary aluminum based on three data setsComparative global production levels of secondary aluminum based on five data setsPrices of primary aluminum in historical US dollars and in US dollars indexed to 2015 values based on four data setsConversion rates for historical US dollars against 2015 valuesIn addition to the preceding global data, extensive pre-1900 data for French, Swiss, and US production levels and French and US prices of primary aluminum are compiled.

scholarly journals Mathematical Modelling for Furnace Design Refining Molten Aluminum

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1798
Author(s):  
Alfredo Alan Flores Saldívar ◽  
Rodrigo Juárez Martínez ◽  
Alfredo Flores Valdés ◽  
Jesús Torres Torres ◽  
Rocío Maricela Ochoa Palacios ◽  
...  
Keyword(s):  
Mathematical Modelling ◽  
Melting Furnace ◽  
Temperature Profiles ◽  
Complex Flow ◽  
Optimal Position ◽  
Combustion Gases ◽  
Physical Experiments ◽  
Simulation Based ◽  
Final Design ◽  
Magnesium Removal

The design of an aluminium melting furnace has faced two challenges: mathematical modelling and simulative optimization. This paper first uses fluid dynamics to model the aluminium process mathematically. Then, the model is utilized to simulate a round shaped reverberatory furnace for melting aluminium alloys. In order to achieve the highest thermal efficiency of the furnace, modelling and simulation are performed to predict complex flow patterns, geometries, temperature profiles of the mixture-gas air through the main chamber, as well as the melting tower attached to the furnace. The results led to the establishment of optimal position and angle of the burner, which are validated through physical experiments, ensuring recirculation of the combustion gases through the melting chamber and the melting tower. Furthermore, a proper arrangement of refractory materials is derived to avoid heat losses through the outer surface of the furnace. Temperature profiles are also determined for the optimization to arrive at the final design of the furnace. Compared with manual designs previously practiced, the simulation-based optimal design of furnaces offers excellent guidance, an increase in the aluminium processing and magnesium removal for more refined alloys, and an increased processing rate of aluminium chip accession.

Additions of Salt Cake and KAlF4 from Aluminum Production to Steelmaking Slags

2012 ◽  
Vol 31 (4-5) ◽  
pp. 529-537
Author(s):  
G.A. Sweet ◽  
S. Ferenczy ◽  
W.F. Caley ◽  
G.J. Kipouros
Keyword(s):  
Raw Materials ◽  
Aluminum Production ◽  
Secondary Aluminum ◽  
Promising Alternative ◽  
Salt Cake ◽  
Steelmaking Slags ◽  
Alternative Means ◽  
Temperature Operating ◽  
Plant Trials

AbstractFluorspar, a mineral primarily composed of CaF2 is the most commonly used slag fluidizer in steelmaking. Due to increasing costs for fluorspar steelmakers are seeking alternative means of achieving slag fluidity. The research has concentrated on other minerals or the wastes of other high temperature operating industries. A promising alternative to fluorspar has been identified in a previous work from this laboratory which is the salt cake from secondary aluminum production such as the flux in remelting aluminum scrap and dross. This material is widely available and also considered toxic (meaning that use in steelmaking helps to reduce environmental impacts from disposal). The present work is an investigation of the viability of using mixtures of salt cake and KAlF4 in slag-fluidizing applications by measurements of viscosity and weight loss at high temperatures (to evaluate whether large amounts of potentially harmful gases are formed). In addition, characterization of raw materials and melted slags has been performed. In terms of fluidity the mixtures of aluminum salt cake and KAlF4 are qualified for use as fluidizers. The results of the present study will be used to design plant trials.

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