NurdRage - 2010-03-21
How to purify manganese sulfate that's been contaminated with iron sulfate. The process is called selective precipitation. By carefully controlling the amount of hydroxides in solution, we can precipitate out the iron hydroxides but leave manganese sulfate in the solution.
Boil it for a while to cause the MnO2 to coalesce into larger particles. If that doesn't work, then try filtering over diatomaceous earth.
I revisited this cleaning up procedure and thought of a different way to separate iron and manganese here. I have a massive amount of contaminated manganese II salts from using mno2 as an oxidizer and i want to salvage it. So if you make the nitrate of these salts and then boil down all the water and heat to over the decomposition point of ferric nitrate but not too close to manganese III nitrate its about 80c higher to decompose the manganese nitrate. The iron will decompose to iron hydroxide leaving soluble manganese nitrate which can easily be purified from there by filtering the iron and a small work up on manganese nitrate. Which if you need a different salt conversion to hydroxide or carbonate is very easy. Thought this might be useful for somebody.
Nurdrage, THANK you for making this video. I have been trying to get MnCl2 out of MnO2 (that I got from the same G*****6 vendor you did before I saw you show how bad it is). That stuff was SO iron contaminated I was just stuck. Your method for purifying MnSO4 works for MnCl2 as well. I'm looking at my clean pink MnCl2 right now! Funny, isn't it, the things that make a nurd happy?
Nurdrage, I have a request -- if you get some free time and are bored, would you make a lab cleanup video? How you clean up after doing some of these actions and experiments, and maybe some good safety precautions around the lab after your work is done? Thanks! Great vids!
Chemistry is arguably one of the hardest things to learn.
When contaminated mno2 is used could you use zinc to get the iron out of solution and then add the hydroxide with excess to get manganese hydroxide and sodium or potassium zincate? Then whatever collected in the filter should be cleaner manganese hydroxide which can be converted back to the desired salt.
Awesome video! Keep it up!
Man... I don't even know what's going on. It's just so sublime to watch you go at it, with your chemicals, and your oddly shaped glass containers. Big ass words... Plus, you've got one of the coolest voices I've ever heard!
Awesome! As a matter of interest, judging by your name, are going to extract manganese metal?
just a suggestion, but when there is a redox reaction, can you show the half reactions in your video?
what's the best way to get rid of leftover manganese dioxide? It's so fine that filtering doesn't seem to help very much.
could you initially wash with sodium bicarbonate to neutralize the acid before adding the strong base?
wow, thanks a lot!
Hey
Can somone help me out separating the solution which consists of magnesium sulphate and manganese sulphate.Also is there a way to do this other than electrolysis?
yeah sure, add a metal like zinc or even more magnesium and you'll displace it out. then take the sponge wet mess and wash it with dilute acid to destroy any excess reducing agent.
Is it possible to skip the overnight prosess by adding some low percentage hydrogenperoxide, or will this convert the Mangenesesulfate(II) to Manganesedioxde(IV)?
My main aim is to remove magnesium ion from the solution of the two.
@1RadicalOne You need 2 copper electrodes. Dip them in the H2SO4 and pass some current, something like 12V or less. The solution turns blue. Then let it dry very slowly.
Okay, I have no idea what you did but it sounded so awesome and interesting that I subscribed - I am definitely going to learn this. FUN!!
I wonder what is the calculation used for taking right amount of acids .Anyone know?
1:39 Doesn't oxygen in the air also react with manganese hydroxide to form a highly insoluble precipitate of Manganese dioxide ? Hence the low yield prolly ??!
can this method work for manganese chloride?
Which hydrate of manganese sulfate is the final product?
Can you make a video of making sodium hydroxide when you have a chance?
Heck yeah! Oxide + Al + CaF2, I'll let you know how it goes. @NurdRage: Will this work for chromium? I'm trying to get pure chromium compounds from stainless steel, and as the sulfate of Cr is around 9 times more soluble than an equal amount of Fe, would this work?
@terawattyear thanks for watching! its good to know people still watch and appreciate these more obscure synthetic videos. :)
That is an awesome video.
@elementcollector1 Try using a different source of Maganese Dioxide to make the Manganese Sulfate. Alternatively, if it doesn't defeat your purpose, it could easily be bought online. Or you could repeat the process shown by Nurdrage here multiple times on the batch you just mentioned and see whether you get the pink solution as shown.
@lamboroghini EDTA would also chelate manganese itself, in addition the complex with iron would still be soluble, so it wouldn't work to purify the manganese sulfate. Also, gram for gram, sodium hydroxide is cheaper :)
You use MnO2, how about if we use Mn Ore, Mn content around 55%. We still use the same composition: 30 gr oxalic acid, 300 gr water & 13 gr H2SO4, OR we can add more H2SO4? more oxalic acid? thanks
@sciencoking electrolyzing a solution of MnSO4 in water is most likely the easiest way to do it at home. You'd probably want another piece of Mn wire to start as a seed, and might need a week or so of electrolysis at 1 amp current near 1.5 volts to get a significant amount. Now I think of it, an aluminum plate with one side taped for later preferntial acid dissolution may be another idea for a cathode.
@Masterkan8 I don't think so as the Iron would be present as Iron Sulfate which is non-magnetic. Please correct me if I'm wrong though
i m working with Mn extraction with this method for ore powder contain Mn, Fe, Si content but not getting the same results getting some yellow colore can anybody give some good idea
Another great vid.
Great vid!
What would I do if I wanted to make large copper sulfate crystals from copper metal? Assume I have access to sulfuric acid and cheap "foundational" chemicals (like NaOH, Mg, etc)
couldnt you use a magnetic stir to get rid of the iron then recrystallization to pure it? im just tossing that out there lol
i wanna make manganese chloride but it is also contaminated iron, would this method of purifying the manganese salfate also work with the chlorides?
I would rather like to get manganese metal from it for my element collection. How could I do that without having it turn back into MnO2?
The chemical stains and burns in my equipment cannot be removed. I've tried, the only way to get rid of them is to replace my equipment and rip out the fumehood surface and install a new one. I'm not going to do that just because people have misconceptions as to why my lab looks the way it does.
@NurdRage I was thinking that you could use K3 EDTA that you could pick up at a vetrinarian. Thats what they use to getheavy metals out of blood so amybe it would percipitate off or sink to the bottom of the beaker.
I don't think its aluminum chloride hexahydrate, if it were it would easily be cleaned with water, which i'm sure you've already tried. try washing the funnel with hydrochloric acid, then nitric acid. Do it in a fumehood. If neither of those work then wash away the acids with water and then try concentrated sodium hydroxide solution.
when ever we take out the precipitate of a solution we end up letting it dry over night, is there a reason you didn't?
Why do you use paper towels as filters instead of coffee filters or filter paper? You noted on your video on making ammonium nitrate that the paper towels left impurities in the ammonium nitrate. It seems to me that paper towels offer much lower quality for only a small saving in price. Not to mention it doesn't look very professional. Is there a special reason you use paper towels?
It looks like you're using plain brown paper towel. Couldn't that potentially contaminate the product? Or nothing significantly?
@weggles it does, but i wanted to with a "homemade" video. If you have filter paper go for it :)
aHA! now i know what that really orange shit is when i try to make Fe2O3. its hydroxide! yay for me. Thank you. (btw, I've found a lot of my solutions growing mold, mainly acetate salts(yes i learned later that they are buffers). im pretty sure that wont be a problem here, but who knows, maybe theres a Mn loving-flesh eating parasite out there :D That'd be pretty cool!)
+NurdRage Does that method work with manganese sulfate that´s been contaminated with ferric sulfate instead of been contaminated with ferrous sulfate?
@Masterkan8 if that were true then you'd be able to remove iron from your blood with a magnet.
your kinda helping me in one of my classes in school
Peter Catsoulis - 2015-10-27
Hey, I am trying this with manganate ore and most of it seems to work (from the previous video), I just wanted to know your opinion on recrystallizing using heat. I dont think this should be a problem (as manganese sulfate doesnt melt till around 634C) but nonetheless an opinion is appreciated