所有的煤都或多或少地含有硫,少的在百分之零点几,多的可达百分之十左右,煤中的硫一般以有机硫和无机硫两种形式存在。有机硫与有机质结合紧密,分布均匀,通过洗选等方法也难以除去,但这种硫的含量不太高,一般在百分之零点几以下。无机硫主要以硫化物和硫酸盐的形式出现。煤中的硫化物主要是黄铁矿和白铁矿,这种物质在煤中呈草莓状或结核状。呈草莓状分布的黄铁矿通常较小,只有在显微镜下才 All of the coal contains more or less sulfur, a little less than a few tenths of a percent, mostly up to about ten percent, and sulfur in coal generally exists in both organic sulfur and inorganic sulfur forms. Organic sulfur and organic matter closely integrated, evenly distributed, by washing and other methods are also difficult to remove, but the sulfur content is not too high, usually less than a few percent. Inorganic sulfur occurs mainly in the form of sulphides and sulphates. Sulfides in coal are mainly pyrite and white iron ore, which are strawberries or tuberculosis in coal. Pyrites in the shape of strawberries are usually smaller, only under a microscope