Technical Library | 2021-06-07 19:10:16.0
The aim of this study was to compare leaching characteristics of metals from printed circuit boards (PCBs), taken from waste electrical and electronic equipment in the presence and in the absence of the iron-oxidizing bacteria, Acidithiobacillus ferrooxidans. A. ferrooxidans not only increases the leached concentration of Cu from the PCBs, but also inhibits the components of the 0K medium and leached Cu from forming precipitates such as libethenite (Cu2(PO4)(OH)), thereby assisting Cu recovery from the PCBs. In addition, the leached concentration of Pb from PCBs decreased in the presence of A. ferrooxidans, due to Pb forming amorphous precipitates. It is expected that Pb is not highly toxic to A. ferrooxidans. Consequently, A. ferrooxidans can be used as a cost-effective and environmentally friendly way to leach out valuable metals from PCBs as low-grade urban ore.
Technical Library | 2022-10-11 17:27:08.0
Lead-free flux technology for electronic industry is mainly driven by high soldering temperature, high alloy surface tension, miniaturization, air soldering due to low cost consideration, and environmental concern. Accordingly, the flux features desired included high thermal stability, high resistance against burn-off, high oxidation resistance, high oxygen barrier capability, low surface tension, high fluxing capacity, slow wetting, low moisture pickup, high hot viscosity, and halogen-free. For each of the features listed above, corresponding desired chemical structures can be deduced, and the impact of those structures on flux residue cleanability can be speculated. Overall, lead-free flux technology results in a greater difficulty in cleaning. Cleaner with a better matching solvency for the residue as well as a higher cleaning temperature or agitation are needed. Alkaline and polar cleaner are often needed to deal with the larger quantity of fluxing products. Reactive cleaner is also desired to address the side reaction products such as crosslinked residue.
Industry News | 2019-12-16 22:45:13.0
Vacuum soldering system is a kind of process welding furnace for high-end products, such as laser devices, aerospace, electric cars and other industries, compared to the traditional chain furnace, has great technical advantages.
Industry News | 2021-05-24 00:19:11.0
Many industries use some types of gasses in many application. Those gases may be harmful to people or possess the ability to cause harm such as able cause explosion when a spark is introduced. However, in many cases, such gas are either odorless or did not have a strong smell. As a result, any leak in the gas would not cause any alert until it causes significant harm. A gas detection system is in desperate need to help prevent those situations by detecting the presence of gas in the surrounding and alert the personnel.
Industry News | 2018-10-18 08:04:17.0
Influences of the solder material for the wave soldering machine soldering quality
Industry News | 2018-10-18 08:05:54.0
The benefits of hard oxidation treatment of wave soldering mahcine and reflow oven guide Rail
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