METHOD FOR TREATMENT OF FLY ASH INVOLVING FIXATION OF CARBON DIOXIDE

WIPO Patent Application WO/2005/084837

A1

A method for the treatment of a fly ash involving the fixation of carbon dioxide, which comprises [1] a step (washing step) of washing a fly ash in a fluid having a pulp concentration of 5 to 100 g/L, while blowing a CO₂ gas into the fluid, to thereby dissolve a Ca component as Ca(HCO₃)₂, and [2] a step of subjecting the slurry formed in the above washing step to a solid-liquid separation, to thereby recover Ca(HCO₃)₂ in a solution after washing and also recover a solid component as a washing residue. The above solution after washing can be used for producing CaCO₃. On the other hand, the above washing residue has a low Ca content, which results in the by-production of a Pb-containing residue having a low content of gypsum through subjecting the washing residue to the leaching with sulfuric acid, and the Pb-containing residue is useful in Pb refining. Further, the solution after the separation of the Pb-containing residue can be used as a raw material for Zn refining.

AICHI TARO (JP)
ASADA HIROSHI (JP)
HORIUCHI AKIYOSHI (JP)
DOHI TETSUO (JP)

PCT/JP2005/002375

September 15, 2005

February 09, 2005

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DOWA MINING CO (JP)
AICHI TARO (JP)
ASADA HIROSHI (JP)
HORIUCHI AKIYOSHI (JP)
DOHI TETSUO (JP)

B09B3/00; B01D11/02; C01F11/18; C01F11/46; C02F1/58; C02F1/62; (IPC1-7): B09B3/00; C01F11/18; C01F11/46

JP2003080199A	2003-03-18
JPH06134470A	1994-05-17

NAKAHARA K. ET AL.: "Yoyu Hibai no Kinzoku Kaishu.", HIBAI TAISAKU YUGAIBUSSHITSU JOKYO. MUGAIKA.SAISHIGENKA GIJUTSU., 1998, pages 208 - 241, XP002997262

Wada, Kenji (Lions Mansion Ichigaya 8-10, Sumiyoshi-ch, Shinjuku-ku Tokyo, JP)

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