鈉提取方法的問題

It is absolutely INCORRECT. Sodium is NEVER extracted by the way you described.

Deville process is sometimes known as Deville-Pechiney process, which "was" used to produce alumina (Al2O3) from bauxite (ore of alumina with impurities like Fe2O3 and silica).

The first stage is the heating of the bauxite at 1200°C with sodium carbonate with coke. The alumina is converted in sodium aluminate.
Al2O3 + Na2CO3 + C → 2NaAlO2 + 2CO
Sodium can NEVER be formed in this step.

In the second stage sodium hydroxide solution is added, which dissolves the sodium aluminate, leaving the impurities as a solid residue. The amount of sodium hydroxide solution needed depends upon the amount of silica present in the raw material.

The solution is filtered off; carbon dioxide bubbled through the solution, causing aluminium hydroxide to precipitate, leaving a solution of sodium carbonate. The latter can be recovered and reused in the first stage.
2NaAlO2 + CO2 + 3H2O → 2Al(OH)3 + Na2CO3

The aluminium hydroxide is heating to produce alumina.
2Al(OH)3 → Al2O3 + 3H2O­

The process has now been replaced by the Bayer process.

I repeat, Sodium can NEVER be formed in this process.

2011-02-04 00:42:26 補充：
我不是抄維基來答問題，而是抄維基來答「維基不是這樣寫的」。

若果問題是 Deville process 是怎樣的，當然要找一些較可信的資料來源。但現在問題提到在基看到的 Deville process 是這樣的，是不是呢？最直接答法是如我這樣答，維基不是那樣寫的，而是這樣寫的。

我當然曾經參考維基來作答。因為維基的內容抄的，若果抄得正確，大部分的內容以前都看過，所以每次都根據自己所學的記憶，參詳每字每句，改動成流暢易明。

老爺子, 你的資料不又是從維基裡抄出來, 改兩個字眼加兩條equation, 再加一句"sodium is not extracted in this way"?
這就當成你的出品?

況且你抄的那頁沒citation, 而sodium 一頁至少有一個citation:
Eggeman, Tim. Sodium and Sodium Alloys. Kirk-Othmer Encyclopedia of Chemical Technology. John Wiley & Sons, Inc. Published online 2007.

2011-02-01 16:33:38 補充：
我這裡沒能看其(網上版)內容, 圖書館也只有1985年版 ---- 一會就去查找; 你的說法除了那一被維基, 還有沒有佐證?

2011-02-04 02:24:41 補充：
不幸地, 那本encyclopedia 也只有一句提及這種方法.
雖然那一條目後還有三條文獻引用, 但我已是沒好氣再追查下去了.

tsunhin//維基 提到的方法中並沒有下bauxite, 不能以"下了bauxite"的情況去證明"不下bauxite" 反應就不成.