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Title:
SYSTEM AND METHOD FOR RECOVERING MERCURY FROM CEMENT KILN DUST
Document Type and Number:
Japanese Patent JP2014055345
Kind Code:
A
Abstract:

To recover mercury efficiently from the dust contained in cement kiln combustion gas.

A system 1 for recovering mercury from cement kiln dust includes: an air current heating furnace 2 for heating the cement kiln dust KD2 in an air current; a sorting machine 3 for separating the cement kiln dust-containing exhaust gas G4 from the air current heating furnace into coarse powder D1 and fine powder D2-containing exhaust gas G5; a solid-gas separation unit 5 for separating the fine powder-containing exhaust gas from the sorting machine into fine powder and exhaust gas; a microwave heating unit 6 for irradiating/heating the separated fine powder D5 with a microwave; and a mercury recovery unit 8 for recovering the mercury volatilized, when the fine powder is irradiated with the microwave, and the mercury contained in the exhaust gas G7 separated in the solid-gas separation unit. It does not matter if a gas cooler 4 is arranged for cooling the fine powder from the sorting machine and the fine powder-containing gas from the gas cooler is supplied to the solid-gas separation unit. The fine powder separated in the solid-gas separation unit can be sent continuously to the microwave heating unit so that the sent fine powder can be irradiated continuously with the microwave.


Inventors:
YOSHIKAWA TOMOHISA
WADACHI HITOSHI
Application Number:
JP2012000202551
Publication Date:
March 27, 2014
Filing Date:
September 14, 2012
Export Citation:
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Assignee:
TAIHEIYO CEMENT CORP
International Classes:
C22B43/00; B01D53/64; B07B7/08; C22B7/02; F27D11/12
Domestic Patent References:
JP2011088770A2011-05-06
JP2007130565A2007-05-31
JPS6160840A1986-03-28
JPS62151532A1987-07-06
Attorney, Agent or Firm:
Nakai Jun