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This is an old revision of this page, as edited by 150.250.5.20 (talk) at 18:58, 19 November 2021. The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

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Good articleManganese has been listed as one of the Natural sciences good articles under the good article criteria. If you can improve it further, please do so. If it no longer meets these criteria, you can reassess it.
Article milestones
DateProcessResult
March 7, 2010Good article nomineeListed

Article changed note

Article changed over to new Wikipedia:WikiProject Elements format by Dwmyers 22:00 Feb 24, 2003 (UTC) and Mkweise. Elementbox converted 14:44, 2 July 2005 by Femto (previous revision was that of 12:16, 27 May 2005). 27 May 2005

Information Sources

Some of the text in this entry was rewritten from Los Alamos National Laboratory - Manganese. Additional text was taken directly from USGS Manganese Statistics and Information, USGS Periodic Table - Manganese, from the Elements database 20001107 (via dict.org), Webster's Revised Unabridged Dictionary (1913) (via dict.org) and WordNet (r) 1.7 (via dict.org). Data for the table was obtained from the sources listed on the subject page and Wikipedia:WikiProject Elements but was reformatted and converted into SI units.

Oxidation States

This was written poorly.

The most common oxidation states of manganese are +2, +3, +4, +6 and +7, though oxidation states from +1 to +7 are observed.

The only oxidation states missing are +1 and +5, so why not -

The most common oxidation states of manganese are +2, +3, +4, +6 and +7, but oxidation states of +1 and +5 are also observed.

References

Re-rate?

I think this is getting to be close to A class. I'd like to see it as a Featured Article. SBHarris

GA Review

This review is transcluded from Talk:Manganese/GA1. The edit link for this section can be used to add comments to the review.

Reviewer: Tea with toast (talk) 04:46, 7 March 2010 (UTC)[reply]

Review summary

I find that this article sufficiently meeting the Good article criteria:

  1. Article is very well written.
  2. The text is accurate and is supported by reliable references.
  3. The text sufficiently covers the main aspects of the topic.
  4. Article is written in a neutral tone.
  5. Article is stable.
  6. Article contains appropriate and helpful images.

Tea with toast (talk) 17:52, 7 March 2010 (UTC)[reply]

Suggestions moving forward to Featured article review

This article is one of the best articles I've read in reviewing GA nominees, and I find it is mostly ready for FA review as it stands. --Tea with toast (talk) 17:52, 7 March 2010 (UTC)[reply]

A few minor changes might be helpful:

  1. In the "Occurrences and production" section, there are photos of manganese ore and Psilomanganese (manganese ore); however, I could not find what distinguishes these two different ores in the text.
  2. I find the third paragraph in "Occurrences and production" to be a bit confusing. Also, the term "ferromanganese" is first occurs there but the subsequent paragraph suggests that ferromangaese is produced, not mined. I would create a new paragraph (or expand the second paragraph) describing the different types of ore.

Further comments

  1. The phrase "undergo a sort of resettlement" is used twice; once in the intro and the other in Geology. I recommend finding a different term that wouldn't cause repetition. I also went ahead an made a grammar fix. Codyorb (talk) 14:40, 22 August 2020 (UTC)[reply]

Process mixup?

"A more progressive extraction process involves directly reducing manganese ore in a heap leach. This is done by percolating natural gas through the bottom of the heap; the natural gas provides the heat (needs to be at least 850 °C) and the reducing agent (carbon monoxide). This reduces all of the manganese ore to manganese oxide (MnO), which is a leachable form. The ore then travels through a grinding circuit to reduce the particle size of the ore to between 150–250 μm, increasing the surface area to aid leaching. The ore is then added to a leach tank of sulfuric acid and ferrous iron (Fe2+) in a 1.6:1 ratio. The iron reacts with the manganese dioxide to form iron hydroxide and elemental manganese. This process yields approximately 92% recovery of the manganese. For further purification, the manganese can then be sent to an electrowinning facility.[35]"

Manganese in soluble salts is typically in a 2+ oxidation state while the manganese ore are typically 4+ or 3+, thus the ores need to be reduced before or during the leach process. This can be done in a variety of ways. Something is wrong with the section above. Either it describes two different processes, one using gas to reduce the ore to MnO for leaching as described and the other using ferrous iron to reduce manganese dioxide i.e. ore that has not previously been reduced, but is it really possible to reduce the manganese to elemental form using Fe2+ or is it used to reduce it to Mn2+ for leaching?

In case Fe2+ really can reduce Mn2+ to elemental manganese and the process really is a two step process with reduction by gas followed by reduction with ferrous iron the error in the text would be smaller: the second reduction by Fe2+ would not be of manganese dioxide but Mn2+ (MnO) (or possibly Mn3+) would be reduced by the ferrous iron.150.227.15.253 (talk) 16:46, 19 March 2020 (UTC)[reply]

Heavy metals

"The tobacco plant readily absorbs and accumulates heavy metals such as manganese from the surrounding soil into its leaves. " --> Manganese is not a heavy metal.Eudialytos (talk) 20:16, 18 March 2021 (UTC)[reply]

´Biological role in humans´: deficiency effects possibly Osteoporosis, Alzheimer's or (sorry) Parkinson

To ´Biological role in humans´: it appears to be a new discovery, that a deficiency may lead to Osteoporosis, Alzheimer's. Just to mention, please. Thanks.
In the german article Mangan at ´Biologische Bedeutung´ (biological meaning) is a (little) list with mangan-rich food: black tea, wheat germ, hazelnuts, oat flakes, soybeans, flaxseed, blueberries, aronia berries, rye full grain bread.
--Visionhelp (talk) 19:04, 10 August 2021 (UTC)[reply]

Mineralogy errors

As a rule for Wikipedia, there is a number of mineralogical errors also here.

(1) "spatial relation to the iron ores, such as sphalerite" --> completely wrong. Sphalerite is a ZINC ore!

(2) "psilomelane" - this name is disused for many years and is a DISCREDITED name; the correct name of this mineral is romanèchite.

Refs. (to mention few):

(1) https://www.ima-mineralogy.org/

(2) https://www.mindat.org/min-3441.html

(3) https://www.mindat.org/min-3727.html Eudialytos (talk) 21:27, 23 September 2021 (UTC)[reply]

Meant as support, if it helps: the links to the Wikipedia-articles.
Sphalerite, Romanèchite.
--Visionhelp (talk) 08:58, 24 September 2021 (UTC)[reply]
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