Talk:Zinc smelting

Content
I removed the following from the pyrometallurgical section because I don't understand what was trying to be said. If someone else can decipher this then please rework it and repost it.

''Another pyrometallurgical process is flash smelting. Then zinc oxide is obtained, usually producing zinc of lesser quality than the hydrometallurgical process. Zinc oxide treatment has much fewer applications, but high grade deposits have been successful in producing zinc from zinc oxides and zinc carbonates using hydrometallurgy.''

--Wizard191 (talk) 01:46, 18 April 2008 (UTC)

Cementation (metallurgy)
Wizard191 split the article cementation into a number of different articles on completely different uses of the term. One of these cementation (metallurgy) links to the purification section of this article. There are several problems with it. Could I ask those who whatch this page to look at its talk page, and comment there? Peterkingiron (talk) 08:47, 29 May 2008 (UTC)

Clarification
I'm not sure what needs to be clarified. Based on the source, which states: "The process takes place at temperatures ranging from 40 to 85EC (104 to 185EF), and pressures ranging from atmospheric to 240 kPa (2.4 atmospheres).", I would assume the pressures are absolute. Wizard191 (talk) 15:58, 25 February 2010 (UTC)


 * The "E" I'm assuming should be the degree sign °.


 * That may well be so—but it isn't necessarily so. That's why it needs to be clarified.  If they are both absolute pressures,  would be clearer if stated to be "absolute pressures from 100 to 240 kPa".
 * Just calling it "atmospheric" without any numbers can easily give the impression that that is the zero point from which the next pressures are measured. In other words, that they are gauge pressures. Gene Nygaard (talk) 16:44, 25 February 2010 (UTC)


 * The source says it's a range therefore both values are of the same pressure measurement; and atmospheric pressure is an absolute pressure, therefore the 2.4 atm pressure is of the absolute kind. I will make note of this in the text even though I don't think it is needed. Wizard191 (talk) 18:25, 25 February 2010 (UTC)


 * It's still a range, if it is from 0 atm to 2.4 atm gauge pressure. "Atmospheric" is merely 0 atm when measured in gauge pressure. There is neither a 0 nor a 1 associated with the first element of the range as it was stated in this article, and apparently in the source as well, so we don't really know what was intended, do we? Gene Nygaard (talk) 01:58, 26 February 2010 (UTC)


 * I see your point. After doing a short search I can't find any other sources about purification pressures, so I'm thinking about removing it as it is probably not pertinent to most readers. Wizard191 (talk) 14:37, 26 February 2010 (UTC)

History
The following statement though taken directly from Encyclopædia Britannica seems incorrect.

"the first production of zinc in quantity seems to have been in India and China".

It is clear from the Encyclopædia Britannica article that the first production in quantity happened in India starting from 12th century whereas as stated in wiki article, in China it started only in 16th Century. If there was a gap of almost 4 century between mass production in India and China then why club them together in this sentence? Shouldn't the article state following instead?

"the first production of zinc in quantity seems to have been in India starting from 12th century and later in China from 16th century" — Preceding unsigned comment added by 86.36.66.129 (talk) 10:30, 15 February 2017 (UTC)

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