2018年5月9日 · 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.

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.

2018年5月29日 · 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.

Fueling even a small ironworks required a large area of forest, as charcoal production was a necessary step preliminary to the smelting process. A colonial blast furnace produced approximately 400 tons of pig iron per year (2 tons of ore could be smelted into 1 ton of pig iron), with each ton requiring between 100 and 120 cords of wood as fuel.

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 ...

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 ...

2018年5月18日 · slag / slag/ • n. 1. stony waste matter separated from metals during the smelting or refining of ore. ∎ similar material produced by a volcano; scoria.

The smelting segment of the U.S. industry ranked first in tonnage of zinc produced until 1971, when a combination of economic factors, environ-mental pressures, and shifting patterns of foreign-resource allocation resulted in nearly one-half of the domestic smelters ceasing operation in a two-year period.

2018年6月8日 · 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.

Indeed, the mining, smelting, and refining of metals constituted an important industry in central Europe during the sixteenth century, and the princes who ruled emerging nation-states sought to encourage its development everywhere as an economic and military resource. Coinage.