How to extract Nickel from Nickel Oxide safely & cost effectively?
957199
If you are doing it in a laboratory setting, you can mix it with carbon and reduce it to the metal. You will need high temperatures, though.
802652
Zn is more reactive than Ni  (this is bcoz Zn is placed higher than Ni in the periodic table), so it would displace Ni from the solution of Ni(NO3)2. The reaction is \nZn + Ni(NO3)2 ----> Zn(NO3)2 + Ni
300790
Here's a link for annealing copper wire.  I don't know if that's what you want.
86077
You should get the MSDS sheets for the chemicals that you use, try invitrogen.com this is the best advice without more details on the techniques you're using.\nThere are two techniques I've used, one is detachment using trypsin/EDTA and the other is scraping the cells off the side of the flask. In both methods there is little danger from the tools you use, more danger is posed by the cells themself. If you're using an established cell line, get the details on it from www.atcc.org if not, be extra careful!
106960
I know 3 ways and they are all difficult and dangerous. The chemicals required are hazardous  and can be lethal. If you happen to find the information on how to do it, I strongly urge you to not. The small amount of gold you will retrieve could come at a VERY high price !!! If you want to prospect for gold (safe and fun) go to www.goldprospectors.org, any information you want about prospecting can be found there.
651090
There are a number of methods: the traditional powder method, magnetic powder, ninhydrin, fuming with super glue...  The best/easiest method is highly dependent on what kind of surface you're attempting to lift the print from.  You'd use one of the powders for glass, but it would be useless on paper; vice versa for ninhydrin.
467500
The gold reclamation process from computer parts (primarily cpus and connecting pins) involves the use of dangerously strong acids and should only be attempted by someone who has researched the process carefully. The 2 items which contain the most gold use similar processes with slightly different acids. I have tried this approach and found more effort in the process, required chemicals, and discarding of the waste products than the value of the gold I recovered.\nThere are a few sellers on EBay and other sites who will gladly sell you the information you need but rest assured that there is more money selling the process to individuals than thay make recovering.\nMay I suggest you sell your CPUs and "finger connectors" on EBay, (just use sheetmetal snips to cut the connector section from the board) they will fetch you a good price with a LOT less effort.
751234
An acid dip will do it. The problem being that the acid will eat the zinc too.  SO, use a dilute acid, such as muriatic. Which is dilute hydrochloric acid.  Nitric, and phosphoric acid would also work. Make sure you don't use a concentrated acid, as it is not needed, and can be quite dangerous.  There is a good chance that a commercial AC coil cleaning solution (inhibited dilute phosphoric I believe) would do the job.  Once the copper is removed, make sure to use tongs to remove the penny, and then rinse it well to stop the action of the acid.
378767
You would complete dissolve it in strong acids and then separate the metals by qualitative analysis techniques.  Not simple and very expensive.
412358
You could skip the Nitrogen Oxide and use Nitrous Oxide.   :o)
817601
try the local chemist....
537198
See the listing of suppliers given in the source below.  If you want to do magnetic separation, you'll want multi-domain particles, which means using particles *larger* than about 100 nm (depending on the material).
630581
I'm not sure there is a 'most common'; the process is specific to the particular chemical to be extracted.  Perhaps the 'most common' extraction process is the 'most common' chemical to be extracted.\n\nMany times a heavy metal in solution is exchanged with a lighter metal (that is non-toxic and safe to dispose).  Ion exchange resins are sometimes used for this purpose. \n\nMembrane filtration is not really effective on dissolved heavy metals.  These days, industrial wastewater is not really dumped down the drain.  It is purified as much as possible, evaporated, and the sludge is taken off to an incinerator or disposed in a hazardous waste unit at great expense.  The EPA will not let contaminated wastewater with heavy metals be dumped into the drain.
848542
The odds are you will spend much more to recover the tiny amount of gold on that necklace than the value of what you recover.\n\nThe plating on gold plated items is very thin and the chemicals used to recover it are very expensive. In order to turn a profit one must run large quantities of recovery materials. The process is very dangerous, even life threatening, so I do not reccommend you attempt this type of gold recovery. I've done it only to be disappointed with my results.
634708
The process of recovering gold from electronics circuits is relatively simple, but also quite expensive to set up.\n\nEquipment required includes a DC power source capable of delivering several amperes of current at approximately 12 to 100 VDC.  ( A DC Arc Welding Power supply will work well here. )\n\nThen the material containing the gold to be extracted must be crushed.  Crushing multi-layer fiberglass circuit boards is difficult, but it must be done to expose as much of the gold as possible.\n\nA solution of water and some Gold Salt should be mixed.  Gold Sulfate is probably the cheapest, but it is STILL very expensive.  The solution should be in the range of 0.5 gram per litre.\n\nObtain a tank or container made of conductive metal.  Copper is best.  Place the crushed material in the tank,\nPour in the Gold Salt solution until crushed material is completely covered. Attach the POSITIVE anode of the power supply to the tank.  Attach the NEGATIVE cathode of the powersupply to a small piece of gold wire or gold goin or jewelry ( Just a seed to get the thing started . ) And immerse this negative lead in the solution, being careful NOT to let it touch the tank or the crushed material.\n\nTurn on the power...And walk way...The Gold from the crushed material will be 'deposited' on the Cathode gradually over time.  The more current you are able to safely supply without burning something up, the faster the process will be.
334010
The only way I've heard of to obtain pure sodium metal is by electrolysis of NaCl.  Basically, place the salt solution between two electrodes (Na+ attracted to anode, Cl- attracted to cathode).\n\nPure Na is extremely reactive, though.  It is very difficult to store, as any exposure to air will cause almost instant oxidation of the surface (formation of Na2O).  There is also very little commercial use for pure Na.  There are many, many commercially viable sodium compounds, but pure sodium is rarely useful.
603614
The mass of a nickel is a 5.02 g. Its density is 8.90 g/mL!\n\nI hope I'm first!