Experimental Studies on Enriching Vanadium from Vanadium Tailings Carbon-Containing Pellets by EAF Melting

2012 ◽  
Vol 217-219 ◽  
pp. 776-779
Author(s):  
En Hui Wu ◽  
Shao Li Yang ◽  
Ping Huang ◽  
Jing Hou
Keyword(s):  
Process Parameters ◽  
Experimental Studies ◽  
Electric Arc ◽  
Orthogonal Test ◽  
Optimum Process ◽  
Process Conditions ◽  
Arc Furnace ◽  
Smelting Reduction ◽  
Experimental Scheme ◽  
Roasting Time

The process of smelting reduction by electric arc furnace was adopted to enriching vanadium to iron from vandium tailings,study the effect of vanadium recovery in the carbon-bearing pellet with different coal ratio、alkalinity and smelting time.Design experimental scheme using orthogonal test principle and experimental results was systematically analysed by the comprehensive methods of intuitive analysis and the optimum process parameters were determined. The optimized process conditions are obtained by one-factor at a time tests for recovery vanadium from vanadium tailings as follows: coal ratio of 12%, alkalinity of 1.5, roasting time of 15min.

Optimization Design of Cold Upsetting Process in Bearings Steel Ball Based on DEFROM

2012 ◽  
Vol 538-541 ◽  
pp. 2759-2766
Author(s):  
Cai An Fu ◽  
Meng Tong ◽  
Xian Wang
Keyword(s):  
Process Parameters ◽  
Optimization Design ◽  
Simulation Analysis ◽  
Orthogonal Test ◽  
Process Time ◽  
Optimum Process ◽  
Ratio Increase ◽  
Cold Upsetting ◽  
Utilization Ratio ◽  
Material Utilization

Abstract.Now the largeness of circumferential belt and 2 poles in ball billet after cold upsetting process and the consequently low material utilization ratio increase the following process time and cause a great waste. In order to obtain low allowance of ball billet, high material utilization ratio and productivity, through the research of the cold upsetting process, evaluating indicator including plumpness, roundness, cold upsetting force and volume was established, orthogonal test was designed. By the Deform simulation analysis the optimum process parameters was obtained. The results show that the optimized cold upsetting force is reduced by 35%. So the optimized process parameters has a great application value.

Evaluation of mechanical properties and surface roughness of cotton–viscose hybrid composite

2020 ◽  
pp. 096739112090905
Author(s):  
Kuppuraj Arunkumar ◽  
Angamuthu Murugarajan
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Composite Material ◽  
Process Parameters ◽  
Water Pressure ◽  
Machining Process ◽  
Optimum Process ◽  
Process Conditions ◽  
Machined Surface ◽  
Reinforced Composite

Natural-fibre reinforced composite material is an emerging material that has great potential to be used in various industrial aspects and applications. The cotton-viscose-reinforced composite is prepared using a compression moulding process. In addition to it, analysis of its mechanical properties was also carried out, such as tensile strength, flexural strength, impact strength and hardness. An attempt was made to process the prepared composite material using abrasive water jet machining (AWJM) under different process parameters (water pressure, nozzle transfer speed and abrasive flow rate) levels to determine the better suitable process conditions to achieve the better surface finish and optimize the machining process. The significance of the optimization process was ensured using the results of the analysis of variance. Morphological analyses of the machined surface were performed using a scanning electron microscope. The surface roughness of 8.28 µm was found to be the optimized process parameter. Optimum process parameters in AWJM are used to improve the surface quality.

Recovery of zinc from electric arc furnace dust by vacuum carbothermal reduction

2021 ◽  
Vol 118 (4) ◽  
pp. 415
Author(s):  
Shaobo Ma ◽  
Zhaohui Zhang ◽  
Shuxiang Xu ◽  
Xintao Li ◽  
Lu Feng
Keyword(s):  
Carbothermal Reduction ◽  
Economic Value ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
Optimum Process ◽  
Reduction Temperature ◽  
Arc Furnace ◽  
Electric Arc Furnace Dust ◽  
Thermodynamic Conditions ◽  
Comprehensive Recovery

Recently, the proportion of electric furnace steelmaking has increased rapidly, and the content of electric arc furnace dust has increased. Through comprehensive recovery of electric arc furnace dust, the harm of metallurgical solid waste can be reduced and economic value can be created. In this paper, it gives a common outline about the known recycling techniques from electric arc furnace dusts and presents the carbothermal reduction under vacuum. The evolution in reduction products in the process of vacuum carbothermal reduction of zinc-containing electric arc furnace dust is studied using the X-ray diffraction (XRD) phase and micro-morphology analysis. The thermodynamic conditions for reduction are computed using Factsage 7.1 program. Through thermodynamic study, it is found that the initial temperature of reducing zinc oxide decreases as the pressure of the system drops. In the process of the vacuum carbothermal reduction experiment, the type of reducing agent, reduction temperature, carbon content, and reaction time are studied. According to the test results, the optimum process parameters are determined as follows: reduction time 30 min, reduction temperature 1273 K. The dezincification effect of electric arc furnace dust can reach over 99%.

Cu CONTAMINANT REMOVAL USING UV/O3 AND REMOTE HYDROGEN PLASMA

2002 ◽  
Vol 09 (01) ◽  
pp. 255-259 ◽  
Author(s):  
KYUNSUK CHOI ◽  
KWANG PYO HONG ◽  
CHONGMU LEE
Keyword(s):  
Exposure Time ◽  
Process Parameters ◽  
Hydrogen Plasma ◽  
Optimum Process ◽  
Process Conditions ◽  
Plasma Cleaning ◽  
Contaminant Removal ◽  
Cleaning Process ◽  
Cleaning Efficiency ◽  
X Ray

Removal of Cu contaminants from Si wafer was carried out using remote hydrogen plasma (RHP) and UV/O 3 cleaning techniques. The concentration of Cu impurities on the wafer surface was monitored by TXRF (total reflection X-ray fluorescence) and XPS (X-ray photoelectron spectroscopy). Our results show that Cu impurities can be effectively removed by hydrogen plasma and UV/O 3 cleaning techniques, if it is performed under optimum process conditions. The optimum process parameters for the remote hydrogen plasma cleaning are the rf power of 20 W and the exposure time of 5 min. The optimum exposure time of the UV/O 3 cleaning for Cu impurity removal is 1 min. A two-step cleaning process composed of remote hydrogen plasma cleaning first and UV/O 3 cleaning next has been found to be more effective than a single UV/O 3 cleaning process, a single remote hydrogen plasma cleaning process, or a two-step cleaning process composed of UV/O 3 cleaning first and remote hydrogen plasma cleaning next. Cleaning efficiency is maximized at optimum process conditions where Cu contaminant removal effect and recontamination effect are traded off. Increasing the process parameters higher than the optimum values would decrease the cleaning efficiency.

Experimental Studies on the Effect of Drilling Parameters on Monel Alloy

2020 ◽  
Vol 979 ◽  
pp. 137-141
Author(s):  
K. Jayakumar ◽  
K. Akash Koundinya ◽  
T. Jayakumar ◽  
M. Harshal ◽  
G. Gopinath
Keyword(s):  
Process Parameters ◽  
Gas Turbines ◽  
Nuclear Reactor ◽  
Combustion Engine ◽  
Experimental Studies ◽  
Tool Material ◽  
High Strength ◽  
Chemical Components ◽  
Optimum Process ◽  
Machining Processes

Monel K-500 is a Nickel based super alloy which have superlative properties such as high strength, resistance to corrosion, retention of mechanical properties at service temperature and structural stability. It finds wide application in aerospace application, nuclear reactor, gas turbines, submarines, combustion engine exhaust valve, petro chemical components, heat exchanger, etc. However, during machining of super alloys, difficulties are there due to its low thermal conductivity and work hardening effect. Challenges in conventional machining can be minimized by using suitable machining as well as process parameters. Among the different machining processes, not much work has been initiated on drilling of above super alloys. Normally, drilled holes are used in screws, bolts, shafts, steam pipes, fitting of furniture and other equipments. By considering the applications and difficulties in machining of super alloys, drilling experiment is selected on Monel K-500. Experiments were conducted as per Taguchi’s L9 orthogonal array using process parameters such as different drill tool material, drilling speed, feed and cutting fluids and Surface roughness and MRR values were measured as output responses. Effect of selected process parameters on the above machinability responses were analyzed. Optimum process parameters were identified to improve the machinability of Monel K-500.

scholarly journals Experimental Study on Three-Dimensional Microstructure Copper Electroforming Based on 3D Printing Technology

Micromachines ◽  
2019 ◽  
Vol 10 (12) ◽  
pp. 887
Author(s):  
Yuanyuan Wu ◽  
Shuangqing Qian ◽  
Hua Zhang ◽  
Yong Zhang ◽  
Hongbei Cao ◽  
...  
Keyword(s):  
3D Printing ◽  
Process Parameters ◽  
Current Density ◽  
Three Dimensional ◽  
Machining Process ◽  
Optimum Process ◽  
Process Conditions ◽  
Influence Of Process Parameters ◽  
Printing Technology ◽  
3D Printing Technology

In order to fabricate three-dimensional metal microstructures, a combined machining process based on 3D printing technology and electroforming technology is proposed. Firstly, a substrate with microstructures is fabricated by 3D printing technology, and then the microstructures were fabricated by electroforming technology. The influence of process parameters such as current density, distance between electrodes and pulse current duty cycle on the electroformed layer were studied and analyzed. It was determined that the peak current density 6A/dm2, the void ratio 20%, and the distance between electrodes 40 mm were the optimum process conditions of electroforming experiment. The electroforming experiments of different microstructures were carried out with the optimum process parameters.

scholarly journals Process Improvements for Direct Reduced Iron Melting in the Electric Arc Furnace with Emphasis on Slag Operation

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 402
Author(s):  
Marcus Kirschen ◽  
Thomas Hay ◽  
Thomas Echterhof
Keyword(s):  
Steel Production ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
Raw Material ◽  
Steel Scrap ◽  
Process Conditions ◽  
Arc Furnace ◽  
Process Improvements ◽  
Direct Reduced Iron ◽  
Arc Furnaces

Steelmaking based on direct reduced iron (DRI, and its compacted derivative hot briquetted iron, HBI) is an anticipated important global alternative to current steel production based on FeOx reduction in blast furnaces due to its lower specific CO2 emission. The majority of DRI is melted and refined in the electric arc furnace with different process conditions compared to the melting of steel scrap due to its raw material composition being rather different. We provide data and analysis of slag composition of DRI charges vs. steel scrap charges for 16 industrial electric arc furnaces (EAFs). Suggestions for optimized slag operation and resulting process improvements of DRI melting in the EAF are given. A dynamic mass and energy model of the DRI melting in the EAF is introduced to illustrate the implications of the adapted slag operation on the EAF process with DRI charges.

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