Flakt SO2 Scrubbing Technology for Primary Aluminum Smelters

JOM ◽  
1984 ◽  
Vol 36 (2) ◽  
pp. 57-62 ◽  
Author(s):  
Erik Keul ◽  
Avrid Tokerud
Keyword(s):  
Primary Aluminum ◽  
Aluminum Smelters

Perfluorocarbon (PFC) Generation at Primary Aluminum Smelters

2013 ◽  
pp. 1015-1023 ◽  
Author(s):  
Bernard P. Léber ◽  
Alton T. Tabereaux ◽  
Jerry Marks ◽  
Brian Lamb ◽  
Touche Howard ◽  
...  
Keyword(s):  
Primary Aluminum ◽  
Aluminum Smelters

Perfluorocarbon (PFC) Generation at Primary Aluminum Smelters

2016 ◽  
pp. 1015-1023
Author(s):  
Bernard P. Leber ◽  
Alton T. Tabereaux ◽  
Jerry Marks ◽  
Brian Lamb ◽  
Touche Howard ◽  
...  
Keyword(s):  
Primary Aluminum ◽  
Aluminum Smelters

scholarly journals Recycling of Spent Pot Lining First Cut from Aluminum Smelters by Utilizing the Two-Step Decomposition Characteristics of Dolomite

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5283
Author(s):  
Yifei Wang ◽  
Xiping Chen ◽  
Shaojun Zhang ◽  
Peixu Yang
Keyword(s):  
Sodium Fluoride ◽  
Heating Temperature ◽  
Calorific Value ◽  
Primary Aluminum ◽  
Electrolytic Production ◽  
Calcination Process ◽  
Aluminum Smelters ◽  
Tiny Amount ◽  
High Level ◽  
Pidgeon Process

Spent Pot Lining First Cut (shortened to SPL-1cut) is a solid waste discharged from a primary aluminum electrolytic production process. SPL-1cut is classified as hazardous waste in China because it contains large amounts of soluble sodium fluoride and a tiny amount of cyanide. Most of SPL-1cut is carbon—about 65%—and its calorific value is 22.587 MJ∙kg−1. There is a high level of sodium fluoride in SPL-1cut—about 15%—and sodium fluoride is randomly distributed in the carbon granule. The recycling of SPL-1cut using dolomite as a reactant, based on the characteristics of the two-step decomposition of dolomite at a high temperature, is discussed. The recycling of SPL-1cut was performed under the following heating conditions: the heating temperature was 850 °C, the holding time was 120 min, and 40% of the dolomite was added to the SPL-1cut. It was found that the cyanides are completely oxidized and decomposed, and dolomite is decomposed into MgO and active CaCO3. At the same time, NaF reacts with active CaCO3 and converts into CaF2. The results provide references for using SPL-1cut as an alternative fuel in the dolomite calcination process of the Pidgeon Process.

Evaluation of the reactivity of treated spent pot lining from primary aluminum production as cementitious materials

2021 ◽  
Vol 170 ◽  
pp. 105584
Author(s):  
Victor Brial ◽  
Hang Tran ◽  
Luca Sorelli ◽  
David Conciatori ◽  
Claudiane M. Ouellet-Plamondon
Keyword(s):  
Primary Aluminum ◽  
Cementitious Materials ◽  
Aluminum Production ◽  
Primary Aluminum Production

Electron Back Scattering Diffraction Analysis of A357 Alloy Modified by Sr

2010 ◽  
Vol 160-162 ◽  
pp. 831-835
Author(s):  
Zhong Wei Chen ◽  
Hai Fang Zhang ◽  
Jiang Chao Zhao
Keyword(s):  
Cast Alloy ◽  
Primary Aluminum ◽  
Mapping Technique ◽  
Eutectic Solidification ◽  
Preparation Technique ◽  
Ion Milling ◽  
A357 Alloy ◽  
Back Scattering ◽  
Eutectic Si ◽  
Eutectic Morphology

Microstructure of A357 alloy modified by Sr has been investigated by the Electron Back Scattering Diffraction (EBSD) mapping technique using a Field Emission Gun Scanning Electron Microscopy (FEG-SEM). An appropriate sample preparation technique by ion milling was applied to obtain a sufficiently smooth surface for EBSD mapping. Results show that the eutectic morphology in microstructure of A357 alloy modified by Sr was changed to fine fibrous, and the grain size was refined. By comparing the orientation of the aluminum in the eutectic to that of the primary aluminum dendrites, the nucleation and growth mechanism of the eutectic solidification in A357 cast alloy was determined. The eutectic Si phase of the modified sample nucleates on the heterogeneous nuclei located in the region between primary α-Al dendrites and grows up, while the eutectic Si phase of the sample without modification nucleates on the primary α-Al dendrites and grows up.

Analysis of Primary Aluminum Composite Panel Gypsum Board Construction Method Paste

2011 ◽  
Vol 255-260 ◽  
pp. 161-165
Author(s):  
Xiang Rong Zhang ◽  
Lu Li
Keyword(s):  
Primary Aluminum ◽  
Economic Benefits ◽  
Construction Method ◽  
Composite Panel ◽  
Aluminum Plate ◽  
Gypsum Board ◽  
Aluminum Composite ◽  
Quality Requirements ◽  
Construction Period ◽  
Silicone Adhesive

Gypsum board as the basis, combined with double-sided adhesive sponge and neutral silicone adhesive connection, this method using gypsum board as the primary fire to A-level, affordable. With high construction speed, short construction period, it can save money and meet the quality requirements and bring greater economic benefits to investors. Therefore, the gypsum board primary aluminum plate construction method paste will be introduced to more and more application.

Deactivation of Red Mud by Primary Aluminum Production Wastes

2021 ◽  
Vol 1040 ◽  
pp. 109-116
Author(s):  
V.Yu. Piirainen ◽  
A.A. Barinkova ◽  
V.N. Starovoytov ◽  
V.M. Barinkov
Keyword(s):  
Carbon Dioxide ◽  
Red Mud ◽  
Negative Impact ◽  
Waste Product ◽  
Primary Aluminum ◽  
Raw Material ◽  
Aluminum Production ◽  
Environmentally Safe ◽  
Primary Aluminum Production ◽  
Knowledge Intensive

Current global environmental challenges and, above all, global warming associated with a change in the carbon balance in the atmosphere has led to the need for urgent and rapid search for ways to reduce greenhouse gas emissions into the atmosphere, which primarily include carbon dioxide as a by-product of human activity and technological progress. One of these ways is the creation of industries with a complete cycle of turnover of carbon dioxide. Aluminum is the most sought-after nonferrous metal in the world, but its production is not environmentally safe, so it constantly requires the development of knowledge-intensive technologies to improve the technological process of cleaning and disposal of production waste, primarily harmful emissions into the atmosphere. Another environmental problem related to aluminum production is the formation and accumulation in mud lagoon of huge amounts of so-called highly alkaline "red mud," which is a waste product of natural bauxite raw material processing into alumina - the feedstock for aluminum production. Commonly known resources and technological methods of neutralizing red mud and working with it as ore materials for further extraction of useful components are still not used because of their low productivity and cost-effectiveness. This article describes the negative impact of waste in the form of "red" mud and carbon dioxide of primary aluminum production on the environment. The results showed that thanks to carbonization of red mud using carbon dioxide, it is possible to achieve rapid curing and its compact formation for safer transportation and storage until further use. Strength tests of concrete samples filled with deactivated red mud were also carried out, which showed the prospects of using concrete with magnesia binder.

The Effect of Electromagnetic Vibration on the Structure Control of A356 Alloy

2007 ◽  
Vol 539-543 ◽  
pp. 329-332 ◽  
Author(s):  
Jung Pyung Choi ◽  
Tae Woon Nam ◽  
Eui Pak Yoon
Keyword(s):  
Structural Control ◽  
Eutectic Silicon ◽  
A356 Alloy ◽  
Low Frequency ◽  
Primary Aluminum ◽  
Magnetic Flux Density ◽  
Structure Control ◽  
Electromagnetic Vibration ◽  
Fine Fiber ◽  
Electro Magnetic

The structural control of A356 alloy, which was not studied among various electromagnetic processing of materials, was considered applying the alternating current and direct current magnetic flux density. The main aim of the present study is to investigate the effects of electromagnetic vibration on the macro and microstructure of A356 alloy in order to develop a new process of structural control in A356 alloy. When the electromagnetic vibration is conducted for changing the shape of primary aluminum, at low frequency (≤60Hz), the shape of dendrite is changed speroidal shape. When the electromagnetic vibration is conducted for changing the shape of eutectic silicon, a morphological change of the eutectic silicon from coarse platelet flakes to fine fiber shape is observed with EMV (Electro Magnetic Vibration) process at high frequency (≥500Hz).

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