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Multiple-hearth Furnace

Fluorine and chlorine from zinc flue dust mainly exist in the form of PbCl, PbF, ZnCl and ZnF. Multiple-hearth furnace provides high temperature and certain negative pressure where physical and chemical reactions take place on the fluorides and chlorides. Consequently, the fluorides and chlorides are evaporated into gas status at 600-750°C and removed with flue gas and dust.


Compared with Waelz kiln, multiple hearth furnace uses lower working temperature and generates less fume dust. Multiple hearth furnace is superior in treating high F/Cl bearing zinc material (Crude Zinc Oxide) than Waelz Kiln.


Specification

1

Hearths

12 layers

2

Effective area

270m2

3

Hearth temp.

650-700°C, max. 900 °C

4

Feed size

≤ 5mm

5

Capacity

≥ 100t/d

6

Zinc direct recovery

≥ 98%

7

F- removal efficiency

≥ 90%

8

Cl- removal efficiency

≥ 80%

9

Fume rate

1.7-2.3%

10

CO gas consumption

Max.1,800m3/h

11

Combustion chamber

8 sets

12

Operation pressure

Slight negative pressure


Metalcess Multiple-hearth furnace-s.jpg
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