安裝中文字典英文字典辭典工具!
安裝中文字典英文字典辭典工具!
|
- Smelting - Encyclopedia. com
Smelting caused much of the ecological damage via acid rain and elevated levels of copper and nickel in the vicinity of the smelters Efforts by government and industry since the 1970s have eliminated most of the sulfur dioxide emissions in the area, and there has been significant progress toward achieving sustainable ecosystems
- Smelters - Encyclopedia. com
Smelting is a method of separating gold, silver, and other metals from their ores with fire and heat intense enough to melt the ores A Spanish law of 22 August 1584 required a government smelter to be established in every mining district in the New World and required all miners to bring their gold and lead-silver to a government furnace
- Slag - Encyclopedia. com
slag slag • n 1 stony waste matter separated from metals during the smelting or refining of ore ∎ similar material produced by a volcano; scoria
- Mitsui Mining Smelting Co. , Ltd. | Encyclopedia. com
MMS was created as Kamioka Mining Smelting Co , Ltd , in 1950 when Mitsui Mining Company was forced to dissolve by the Allied occupation forces in Japan Mitsui Mining was one of the oldest and most important of the many affiliates of the Mitsui zaibatsu, or conglomerate, its large coal mines having first been acquired by the parent company
- Abraham Darby - Encyclopedia. com
He had worked for a while in the copper smelting industry and observed that coke was used in that smelting process with success Coke burned hotter and more steadily than coal and sustained the higher temperatures needed for smelting Darby began to think about an iron smelting operation that would incorporate coke rather than coal
- Metallurgy through the Ages | Encyclopedia. com
The first smelting of iron probably occurred in Anatolia, part of modern Turkey, in 2000 b c But pure iron is fragile, and the first uses of iron were generally ornamental A breakthrough occurred with the development of coking, which allowed melting at lower temperatures and provided a harder, more durable version of the metal (really a
- Ore - Encyclopedia. com
Mining, beneficiation, and smelting have led to the introduction of unacceptable levels of metals into lakes, streams, and ground water Underground mining has caused land surface subsidence problems in many parts of the country, principally in coal mining areas
- Melting Pot - Encyclopedia. com
MELTING POT MELTING POT is a term that originated in Israel Zangwill's 1908 drama, The Melting Pot It examined the American dream, the acceptance of newcomers, and their subsequent Americanization
|
|
|