Sự hình thành của than

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Kh\u1ea3 n\u0103ng s\u1ea3n xu\u1ea5t lignin \u0111\u00e3 d\u1eabn \u0111\u1ebfn s\u1ef1 ti\u1ebfn h\u00f3a c\u1ee7a nh\u1eefng c\u00e2y \u0111\u1ea7u ti\u00ean. Nh\u01b0ng vi khu\u1ea9n v\u00e0 n\u1ea5m kh\u00f4ng ph\u00e1t tri\u1ec3n ngay kh\u1ea3 n\u0103ng ph\u00e2n h\u1ee7y lignin, v\u00ec v\u1eady g\u1ed7 kh\u00f4ng ph\u00e2n h\u1ee7y ho\u00e0n to\u00e0n m\u00e0 b\u1ecb ch\u00f4n v\u00f9i d\u01b0\u1edbi l\u1edbp tr\u1ea7m t\u00edch, cu\u1ed1i c\u00f9ng bi\u1ebfn th\u00e0nh than. 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V\u00e0o nh\u1eefng th\u1eddi \u0111i\u1ec3m kh\u00e1c nhau trong qu\u00e1 kh\u1ee9 \u0111\u1ecba ch\u1ea5t, Tr\u00e1i \u0111\u1ea5t c\u00f3 nh\u1eefng khu r\u1eebng r\u1eadm \u1edf nh\u1eefng v\u00f9ng \u0111\u1ea5t ng\u1eadp n\u01b0\u1edbc th\u1ea5p. \u1ede nh\u1eefng v\u00f9ng \u0111\u1ea5t ng\u1eadp n\u01b0\u1edbc n\u00e0y, qu\u00e1 tr\u00ecnh than h\u00f3a b\u1eaft \u0111\u1ea7u khi c\u00e1c ch\u1ea5t th\u1ef1c v\u1eadt ch\u1ebft \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 kh\u1ecfi s\u1ef1 ph\u00e2n h\u1ee7y sinh h\u1ecdc v\u00e0 oxy h\u00f3a. \u0110i\u1ec1u n\u00e0y khi\u1ebfn cacbon b\u1ecb gi\u1eef l\u1ea1i trong c\u00e1c v\u0169ng l\u1ea7y than b\u00f9n r\u1ed9ng l\u1edbn m\u00e0 cu\u1ed1i c\u00f9ng \u0111\u00e3 b\u1ecb tr\u1ea7m t\u00edch v\u00f9i l\u1ea5p s\u00e2u. 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D\u00f9ng l\u00e0m ch\u1ea5t \u0111\u1ed1t trong c\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p: c\u00f4ng nghi\u1ec7p nhi\u1ec7t \u0111i\u1ec7n, c\u00f4ng nghi\u1ec7p luy\u1ec7n kim, c\u00f4ng ngh\u1ec7 th\u1ef1c ph\u1ea9m. Ngo\u00e0i ra than \u0111\u00e1 c\u00f2n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0m c\u00e1c \u0111i\u1ec7n c\u1ef1c cho c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n d\u00e2n d\u1ee5ng ph\u1ee5c v\u1ee5 cu\u1ed9c s\u1ed1ng con ng\u01b0\u1eddi.\n2. Than \u0111\u00e1 d\u00f9ng \u0111\u1ec3 l\u00e0m v\u1eadt li\u1ec7u l\u1ecdc n\u01b0\u1edbc\nThan \u0111\u00e1 l\u00e0 ho\u1ea1t t\u00ednh c\u00f3 t\u00ednh ch\u1ea5t h\u1ea5p th\u1ee5 c\u00e1c ch\u1ea5t \u0111\u1ed9c. Ngo\u00e0i ra ch\u00fang c\u00f2n c\u00f3 t\u00e1c d\u1ee5ng tuy\u1ec7t v\u1eddi trong vi\u1ec7c gi\u1eef c\u00e1c ch\u1ea5t kh\u00ed, ch\u1ea5t h\u01a1i, ch\u1ea5t tan trong dung d\u1ecbch tr\u00ean b\u1ec1 m\u1eb7t. \n3. 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Than \u0111\u00e1 c\u00f3 th\u1ec3 g\u00e2y nhi\u1ec5m ngu\u1ed3n n\u01b0\u1edbc\nThan \u0111\u00e1 \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t v\u00e0 s\u1eed d\u1ee5ng than \u0111\u00e1 v\u1edbi m\u1ed9t l\u01b0\u1ee3ng n\u01b0\u1edbc l\u1edbn. \u0110\u00f3 ch\u00ednh l\u00e0 l\u00fd do khi\u1ebfn s\u1ea3n ph\u1ea9m g\u00e2y \u1ea3nh h\u01b0\u1edfng t\u1edbi ngu\u1ed3n n\u01b0\u1edbc s\u1eed d\u1ee5ng c\u1ee7a con ng\u01b0\u1eddi. N\u01b0\u1edbc l\u00e0 th\u1ee9 kh\u00f4ng th\u1ec3 thi\u1ebfu trong su\u1ed1t qu\u00e1 tr\u00ecnh khai th\u00e1c, l\u00e0m s\u1ea1ch, l\u01b0u tr\u1eef than.\n2. Than \u0111\u00e1 g\u00e2y \u00f4 nhi\u1ec5m kh\u00f4ng kh\u00ed\nTrong qu\u00e1 tr\u00ecnh h\u00ecnh th\u00e0nh than, c\u00e1c ch\u1ea5t kh\u00ed \u0111\u1ed9c h\u1ea1i nh\u01b0 carbon dioxide, c\u00e1c h\u1ee3p ch\u1ea5t th\u1ee7y ph\u00e2n, h\u1ee3p ch\u1ea5t l\u01b0u hu\u1ef3nh \u0111ioxit hay c\u00e1c nit\u01a1 oxit s\u1ebd x\u00e2m nh\u1eadp v\u00e0o kh\u00f4ng kh\u00ed. 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