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Zehnder Verkaufs-Und Verwaltungs Ag

Ekm-Roth Gmbh

Hubert Roth

Gernot Mayer-Schwinning

Hansjoerg Herden

Stefan Federhen

The apparatus for separating toxic organic substances from a dust-containing exhaust gas of a sintering plant, includes a clay adsorption agent, advantageously consisting of kaolinite, bentonite, illite and/or mixtures thereof, having a mean particle diameter of from 5 to 100 micrometers; a solids-entraining reactor (4) connected to the sintering plant (1) to receive the exhaust gas containing dust from it and a supply device (5) with feed line (6) for supplying the clay adsorption agent to the solids-entraining reactor (4) to bring the entire exhaust gas containing dust into contact with the clay adsorption agent for a reaction time of from 0.5 to 10 seconds above a dew point of the exhaust gas at a temperature from 90.degree. to 180.degree. C. and at a velocity from 6 to 20 meters per second to thus form a gas-solids suspension having a mean suspension density of from 5 to 500 g solids per sm.sup.3 of the exhaust gas; a cyclone (R) for separating and recycling recovered solids from the gas-solids suspension to form a partially purified gas; and a multifield electrostatic precipitator (7) connected to the cyclone(R) to form separated solids and a purified gas from the partially purified gas; and a recycling device (9) for recycling the separated solids formed in the electrostatic precipitator (7) to the solids-entraining reactor (4).

Process and apparatus for separating polycyclic and polyhalogenated

The process for separating toxic organic substances from a dust-containing exhaust gas from a sintering process, particularly a process of sintering iron ore, includes bringing the entire exhaust gas from a sintering conveyor into contact with clays, layer silicate, and diatomaceous earth or mixtures thereof within a gas-solids suspension for a reaction time of from 0.5 to 10 seconds above the dew point at a temperature from 90.degree. to 180.degree. C. and at a velocity from 6 to 200 meters per second. The median particle diameter, d.sub.50, of the solid adsorption agent in the gas-solids suspension is from 5 to 100 micrometers and the mean suspension density of the gas-solids suspension is from 5 to 500 g solids per sm.sup.3 exhaust gas. The dust and other solids are subsequently jointly separated from the gas-solids suspension, and part of the separated solids is again contacted with the exhaust gas from the sintering conveyor. An apparatus for carrying out the process is also described.

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Bad Vilbel, Germany

Hubert Roth