Multiple Hearthing Roasting Furnace Metalurgi
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Transcript of Multiple Hearthing Roasting Furnace Metalurgi
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7/27/2019 Multiple Hearthing Roasting Furnace Metalurgi
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Multiple Hearthing Roasting Furnace adalah nama sebuah alat ekstrasi metalurgi.
Multiple Hearth Roaster dapat juga digunakan secara luas untuk mengoksidasi, sulfatizing,
chloridizing, volatilizing, reducing, dan proses calcining.
Multiple Hearth Roaster adalah besi berlapis yang tahan api, silinder vertikal bercangkang baja
ditempatkan pada Roaster berfungsi sebagai tungku refraktori.
Contoh penggunaan Multiple Hearthing Roasting Furnace
PENGOLAHAN ZINC
Mineral :
Sphalerite (ZnS), Franklinite (ZnO, MnO, Fe2O3). Kdr Zn pd ZnS sekitar 3%
PBG :
Differential FlotationPreparasi Kimia :
Roasting dilakukan pd flash roster, multiple hearth roaster mengubah sulfida menjadi oksida.
Diharapkan sulfida dpt direduksi dari 50% menjadi 8% saja.
ZnS +3/2O2 à ZnO + SO2
Preparasi Fisik:
Dialkukan sintering (digumpalkan) juga akan mereduksi S dr 8% mjd 1% saja.
Retorting:
Ada 2 mcm : vertical dan horizontal
Zinc akan melebur pd 419 C, mendidih 906 C sedang mereduksi dibutuhkan Temp 910-930 CReaksi :
ZnO + C à Zn + CO……..1
ZnO + CO à Zn+CO2…...2
CO2 + C à 2CO…………3
Hal2 yg perlu diperhatikan:
-Zinc mudah bereaksi dgn CO
-Pd T 1000 C, CO jmlnya sedikit
Reynold Kevin W.
1009045040
Metallurgy
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EQUIPMENT - 3-FOOT-DIAMETER MULTIPLE-HEARTH FURNACE
A 3-foot inside diameter, eight-hearth roaster is available at Hazen for pilot-plant
thermal processing studies. Materials most suited for processing in this unit include
finely divided ores, and concentrates, samples with adhering characteristics, and
samples requiring combustion or pyrolysis over long residence times at controlledtemperatures (e.g. carbon activation).
The multiple-hearth furnace
is 4.5-feet in diameter by
6.5-feet high, and its
perimeter is lined with eight
inches of insulating
refractory. Hearth floors have
an average surface area of
about 6.5 square feet. The
maximum operationalcapacity of the furnace is
about 8.7 cubic feet when
using a two-inch-deep bed on
51.7 square feet of hearth
floor. Rabble arms attached
to a central vertical shaft
agitate and move material
from each hearth to the next.
Both the vertical shaft and rabble arms are made of cast 309 stainless steel and
can be internally cooled with air, allowing operating temperatures up to 1000°C
(1850°F).
The multiple hearth is heated to operating temperature using gas burners mounted
on each of five different hearths, as shown in the schematic. Each burner has a
thermal capacity of 140,000 Btu per hour, providing an overall furnace capability of
about 700,000 Btu per hour. Process temperature profiles are adjusted and
maintained with the use of the burners and secondary air adjustments. Steam or
reformed gas can be injected for gas atmosphere control. Flue gases from the
furnace are conveyed through an exhaust duct to a cyclone and baghouse for dust
removal. A scrubber is used for final gas cleaning before the gas is exhausted to the
atmosphere.
Feed rate and retention time can be varied to accommodate a wide range of
operating conditions. Material is introduced using a variable-speed screw located
above the top hearth. Feed rates to the furnace range from 25 to 700 pounds per
hour, depending on the physical characteristics and processing requirements of the
material. Retention times can be controlled to range from 30 minutes to 12 hours.
Final product is discharged from the bottom hearth to a canister, to a four-inch
water-cooled screw, or to other solids-handling equipment.