It has proved by practice that Al-Ca double alkali method is more direct than Na-Ca double alkali method.

运行实践证明，铝钙双碱法比钠钙双碱法更顺行。

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In order to decrease Ca and al content in silicon metal, the process equipments and operations of refining silicon metal by oxygen bottom blowing are introduced.

为了降低工业硅中的钙、铝含量，介绍了氧气底吹精炼工业硅的工艺设备和工艺操作。

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The methods of removal such impurities as al and Ca include chlorination and oxidation refining process industrially.

工业上去除杂质元素的方法主要有氯化精炼法和氧化精炼法。

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Senators Richard Shelby (R-AL), Barbara Boxer (D-CA), Dick Durbin (D-IL), Mike Enzi (R-WY), Chuck Schumer (D-NY), Frank Lautenberg (D-NJ), Johnny Isakson (R-GA), Jeff Merkley (D-OR) and Michael Bennet (D-CO) are accompanying Senate Majority Leader Reid on the trip.

FORBES: What Will Sen. Harry Reid Bring Back from China?