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heated with concentrated hydrochloric acid
I've been trying to make Zinc Sulphide:Manganese doped electroluminescent paints for electronics displays. I'm getting the manganese from old batteries. Getting it cleanly away from the activated carbon and in a usable form with the most basic of chemicals and methods (so others can have a go at home) has required a bit of thinking
But I ended up simply mixing the black paste (after three water washes to remove the base) with 28% hydrochloric. The mixture warmed it's self up and began to foam with all the carbon in there but, on vacuum filtering through a fine grade sinter, I now have my pretty pink, very clean salt.
So I'm not sure precisely how much heating the MnO2 + HCl route requires, but it doesn't seem to need a lot.
If anyone's interested, the zinc is coming from the batteries as well. The casings are dissolved in battery sulphuric for a few days (to get rid of as much acid as possible), filtered, heated to white, powdered, reduced with powdered sulphur rock from the pet store to the sulphide. About 1% of mang.chloride to 0.001% is used for doping the sulphide. Bake under nitrogen at 600 - 900C for a few hours to drive the dopant in.
Is the photo of the anhydrous stuff or the hydrate. The mineral is anhydrous (and hygroscopic apparently) but I would guess that whoever snapped the photo, use the hydrate which is more commonly found inthe lab.--Smokefoot 02:07, 19 May 2006 (UTC)
- Click on the photo and you'll see! It's the tetrahydrate, I took the photo. It's one of my favourites, actually, because I think it looks very pretty! Walkerma 08:45, 19 May 2006 (UTC)
Replacing chembox with chembox new
The information regarding the hydrates has all been moved across- multiple compounds in the chem box will cause problems in future if links to other databases are introduced--Axiosaurus (talk) 10:22, 25 January 2008 (UTC)
Updating this would also provide molecular formula AQ 23:40, 6 October 2008 (UTC)
Solubility in water data does not make sense!