Preliminary Study of the Effect of Stirring Rate, Temperature and Oxygen Pressure on the Leach Rate of Copper Powder, Generated by Grinding of Printed Circuit Boards of Computer

2017 ◽  
pp. 699-707
Author(s):  
M. A. Mesinas Romero ◽  
I. Rivera Landero ◽  
M. I. Reyes Valderrama ◽  
E. Salinas Rodríguez ◽  
J. Hernández Ávila ◽  
...  
Keyword(s):  
Oxygen Pressure ◽  
Copper Powder ◽  
Printed Circuit Boards ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Leach Rate ◽  
Stirring Rate ◽  
Preliminary Study

scholarly journals Production of copper powder form printed circuit boards by electrodeposition

2013 ◽  
Vol 11 (2) ◽  
pp. 241-247
Keyword(s):  
Copper Powder ◽  
Printed Circuit Boards ◽  
High Current Density ◽  
Special Section ◽  
Dendritic Structure ◽  
Powder Form ◽  
High Current ◽  
Circuit Boards ◽  
Acid Media ◽  
Printed Circuit

During the last years, the waste electrical and electronic equipment (WEEE) are gathering attention, as a very special section of waste. In fact, they have been proven to be source for the recovery of metals. In the present study printed circuit boards (PCBs) were cut and treated thermally at 500oC for 1 h in both air and nitrogen atmosphere. The obtained material was dissolved in three different acid media HNO3aq, HClaq and H2SO4aq, in order to extract copper. The achieved Cu recovery percentages were 97.5, 65 and 76.5% respectively. Electrodeposition technique was applied in order to recover copper in powder form. More than 98% of copper was recovered achieved by application of high current density resulting to dendritic structure of copper. The applied process was characterised by a high current efficiency and led to the production of copper powder of 80 μm mean diameter appropriate for powder metallurgy applications.

Slit Effect of Common Ground Patterns in Affecting Cross-Talk Noise between Two Parallel Signal Traces on Printed Circuit Boards

2008 ◽  
Vol 128 (11) ◽  
pp. 657-662 ◽  
Author(s):  
Tsuyoshi Maeno ◽  
Yukihiko Sakurai ◽  
Takanori Unou ◽  
Kouji Ichikawa ◽  
Osamu Fujiwara
Keyword(s):  
Cross Talk ◽  
Printed Circuit Boards ◽  
Common Ground ◽  
Circuit Boards ◽  
Printed Circuit

Laser dicing of electronics printed circuit boards using a DPSS UV Nd:YVO4 laser

2007 ◽  
Author(s):  
X. C. Wang ◽  
Z. L. Li ◽  
T. Chen ◽  
K. H. L. Li ◽  
B. K. Lok ◽  
...  
Keyword(s):  
Printed Circuit Boards ◽  
Circuit Boards ◽  
Printed Circuit

Influence of Component Mounting Density on Oscillating Characteristics of Multilayer Printed Circuit Boards

2018 ◽  
Vol 23 (2) ◽  
pp. 141-148
Author(s):  
S.Sh. Rekhviashvili ◽  
◽  
M.O. Mamchuev ◽  
V.V. Narozhnov ◽  
M.M. Oshkhunov ◽  
...  
Keyword(s):  
Printed Circuit Boards ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Oscillating Characteristics

Noise properties of thin-film Ni-P resistors embedded in printed circuit boards

2013 ◽  
Vol 61 (3) ◽  
pp. 731-735
Author(s):  
A.W. Stadler ◽  
Z. Zawiślak ◽  
W. Stęplewski ◽  
A. Dziedzic
Keyword(s):  
Thin Film ◽  
Printed Circuit Boards ◽  
Circuit Boards ◽  
Noise Component ◽  
Printed Circuit ◽  
Resistance Bridge ◽  
Different Types ◽  
Signal Path ◽  
Resistance Fluctuations ◽  
Made In

Abstract. Noise studies of planar thin-film Ni-P resistors made in/on Printed Circuit Boards, both covered with two different types of cladding or uncladded have been described. The resistors have been made of the resistive-conductive-material (Ohmega-Ply©) of 100 Ώ/sq. Noise of the selected pairs of samples has been measured in the DC resistance bridge with a transformer as the first stage in a signal path. 1/f noise caused by resistance fluctuations has been found to be the main noise component. Parameters describing noise properties of the resistors have been calculated and then compared with the parameters of other previously studied thin- and thick-film resistive materials.

LEACHING OF METALS FROM WASTE PRINTED CIRCUIT BOARDS (WPCBs) USING SULFURIC AND NITRIC ACIDS

2014 ◽  
Vol 13 (10) ◽  
pp. 2601-2607 ◽  
Author(s):  
Jae-chun Lee ◽  
Manoj Kumar ◽  
Min-Seuk Kim ◽  
Jinki Jeong ◽  
Kyoungkeun Yoo
Keyword(s):  
Printed Circuit Boards ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards
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