| 摘要 |
PCT No. PCT/SE92/00428 Sec. 371 Date Feb. 2, 1994 Sec. 102(e) Date Feb. 2, 1994 PCT Filed Jun. 16, 1992 PCT Pub. No. WO93/03363 PCT Pub. Date Feb. 18, 1993.A method and system for Very Low Temperature Ashing (VLTA). In one embodiment, there is provided a method of ashing solid fuel or combusted or partly combusted fuel or any organic and inorganic matrix which contains minerals in a furnace with a partial pressure less than atmospheric pressure including the step of mixing of oxygen and helium with a total pressure less than the atmospheric pressure and producing a plasma in which the mineral components in the samples are not being affected essentially, wherein the proportion of the gas mixture achieve a surface temperature not exceeding 150 DEG C. on the sample. In an alternative embodiment, there is provided a method of ashing solid fuel or combusted or partly combusted fuel or any organic and inorganic matrix which contains minerals in a surface with a plasma including the step of regulating the proportion between oxygen and helium by a reduction of oxygen content, wherein the surface temperature shall not exceed 150 DEG C. and the temperature being controlled during the entire ashing procedure.
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