This article concludes the test result of the internal puddler about injecting the bituminous and anthracite mixed coal.

本文归纳了国内炼铁工作者关于高炉喷吹烟无混合煤的试验结果。

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The conventional material in these filters has long been a bituminous coal base, whereas one of Siemens' new products uses coconut shells.

这些过滤器的常规材料一直以来都使用烟煤做滤材，而西门子的一种新产品使用椰壳做滤材。

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Less dense types, such as sub-bituminous and lignite coal, can contain up to 50% water.

低浓度的煤炭，如亚煤烟煤和褐煤等，其含水量最高可达50%。

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Mr. Petzer "is the best coal geologist I've known, " says Mr. Slater, who is currently using him to look for bituminous coal in the Orange Free State.

WSJ: In Geology, Old-Timers Can Be Worth Their Weight in Gold

On 1 September 1990, Dublin banned the sale and burning of bituminous coal.

BBC: The filthy air conundrum

The majority of coal produced domestically is of the bituminous and subbituminous variety.

FORBES: Chinese Demand Will Drive This Wyoming Coal Stock