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nature : wood in isolation from the air under the conditions of heat generated from decomposition. The main ingredient is carbon, ash low heat value of about 27.21 to 33.49 MJ / kg. Pine porous quality, containing air hole can float on the water surface. A gas absorption characteristics. For biscuit factories, smelters and other fuels are used in water filtration, liquid bleaching, and the preparation of black gunpowder, etc.. Method two : (1) the fires of the kiln, built with mud ditches, filled with wood, or kerosene from the kiln entrance doors combustion point, charring the wood kiln, the volatiles escape and the remaining charcoal; (2) dry distillation method, see dry distillation of timber. According to the kiln out the blaze, there are charcoal and white charcoal two.
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