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Outline
Indent Level
Color Curly Brackets (indicating CPC extensions to IPC)

CPC
COOPERATIVE PATENT CLASSIFICATION
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MANUFACTURE OF IRON OR STEEL (preliminary treatment of ferrous ores or scrap C22B 1/00; electric heating H05B)
NOTE
-
This subclass covers the production of iron or steel from source materials, e.g. the production of pig-iron, and apparatus specially adapted therefor, e.g. blast furnaces, air heaters (furnaces in general F27).

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C21B 3/00
General features in the manufacture of pig-iron (mixers for pig-iron C21C 1/06)
.
by applying additives, e.g. fluxing agents
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.
Recovery of by-products, e.g. slag
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. .
Treatment of liquid slag (slag wool C03B; slag stones C04B)
. . .
Cooling slag
C21B 3/10
. . .
Slag pots; Slag cars
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Making pig-iron in the blast furnace
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C21B 5/001
.
{
Injecting additional fuel or reducing agents
}
C21B 5/002
. .
{
Heated electrically (plasma)
}
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C21B 5/003
. .
{
Injection of pulverulent coal
}
C21B 5/004
. . .
{
Injection of slurries
}
C21B 2005/005
. .
{
Selection or treatment of the reducing gases
}
C21B 5/006
.
{
Automatically controlling the process
}
C21B 5/007
.
{
Conditions of the cokes or characterised by the cokes used
}
C21B 5/008
.
{
Composition or distribution of the charge
}
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C21B 5/02
.
Making special pig-iron, e.g. by applying additives, e.g. oxides of other metals
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C21B 5/023
. .
{
Injection of the additives into the melting part
}
C21B 5/026
. . .
{
of plastic material
}
C21B 5/04
.
Making slag of special composition
.
Using top gas in the blast furnace process (in coke ovens C10B)
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Blast furnaces (lifts associated with blast furnaces B66B 9/06)
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C21B 7/002
.
{
Evacuating and treating of exhaust gases
}
C21B 7/005
. .
{
Bleeder valves or slides
}
C21B 7/007
.
{
Controlling or regulating of the top pressure
}
C21B 7/02
.
Internal forms
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.
with special refractories (refractory materials C04B)
. .
Linings for furnaces
C21B 7/08
.
Top armourings
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.
Cooling; Devices therefor
C21B 7/103
. .
{
Detection of leakages of the cooling liquid
}
C21B 7/106
. .
{
Cooling of the furnace bottom
}
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.
Opening or sealing the tap holes
C21B 7/125
. .
{
Refractory plugging mass
}
.
Discharging devices, e.g. for slag
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.
Tuyéres
C21B 7/163
. .
{
Blowpipe assembly
}
C21B 7/166
. .
{
Tuyere replacement apparatus
}
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C21B 7/18
.
Bell-and-hopper arrangements
. .
with appliances for distributing the burden
.
Dust arresters
.
Test rods or other checking devices
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C21B 9/00
Stoves for heating the blast in blast furnaces
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C21B 9/02
.
Brick hot-blast stoves
C21B 9/04
. .
with combustion shaft
C21B 9/06
. .
Linings
C21B 9/08
.
Iron hot-blast stoves
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C21B 9/10
.
Other details, e.g. blast mains
C21B 9/12
. .
Hot-blast valves or slides for blast furnaces (valves in general F16K)
C21B 9/14
.
Preheating the combustion air
C21B 9/16
.
Cooling or drying the hot-blast
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C21B 11/00
Making pig-iron other than in blast furnaces
C21B 11/02
.
in low shaft furnaces
{
or shaft furnaces
}
C21B 11/06
.
in rotary kilns
C21B 11/08
.
in hearth-type furnaces
C21B 11/10
.
in electric furnaces
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Making spongy iron or liquid steel, by direct processes
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C21B 13/0006
.
{
obtaining iron or steel in a molten state
}
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C21B 13/0013
. .
{
introduction of iron oxide into a bath of molten iron containing a carbon reductant
}
C21B 13/002
. . .
{
Reduction of iron ores by passing through a heated column of carbon
}
C21B 13/0026
. .
{
introduction of iron oxide in the flame of a burner or a hot gas stream
}
C21B 13/0033
.
{
In fluidised bed furnaces or apparatus containing a dispersion of the material
}
C21B 13/004
.
{
in a continuous way by reduction from ores
}
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C21B 13/0046
.
{
making metallised agglomerates or iron oxide
}
C21B 13/0053
. .
{
On a massing grate
}
C21B 13/006
.
{
Starting from ores containing non ferrous metallic oxides
}
C21B 13/0066
.
{
Preliminary conditioning of the solid carbonaceous reductant
}
C21B 13/0073
.
{
Selection or treatment of the reducing gases
}
C21B 13/008
.
{
Use of special additives or fluxing agents
}
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C21B 13/0086
.
{
Conditioning, transformation of reduced iron ores
}
C21B 13/0093
. .
{
Protecting against oxidation
}
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C21B 13/02
.
in shaft furnaces
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C21B 13/023
. .
{
wherein iron or steel is obtained in a molten state
}
C21B 13/026
. . .
{
heated electrically
}
C21B 13/04
.
in retorts
C21B 13/06
.
in multi-storied furnaces
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C21B 13/08
.
in rotary furnaces
C21B 13/085
. .
{
wherein iron or steel is obtained in a molten state
}
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.
in hearth-type furnaces
C21B 13/105
. .
{
Rotary hearth-type furnaces
}
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.
in electric furnaces
C21B 13/125
. .
{
By using plasma
}
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.
Multi-stage processes
{
processes carried out in different vessels or furnaces
}
C21B 13/143
. .
{
Injection of partially reduced ore into a molten bath
}
C21B 13/146
. .
{
Multi-step reduction without melting
}
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Other processes for the manufacture of iron from iron compounds (general methods of reducing to metal C22B 5/00; by electrolysis C25C 1/06)
C21B 15/003
.
{
By using nuclear energy
}
C21B 15/006
.
{
By a chloride process
}
C21B 15/02
.
Metallothermic processes, e.g. thermit reduction
C21B 15/04
.
from iron carbonyl
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C21B 2100/00
Exhaust gases
C21B 2100/02
.
Treatment of the exhaust gases
C21B 2100/04
.
Recirculation of the exhaust gases
C21B 2100/06
.
Energy from waste gases used in other processes
C21B 2200/00
Recycling of waste material
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C21B 2300/00
Process aspects
C21B 2300/02
.
Particular sequence of the process steps
C21B 2300/04
.
Modeling of the process, e.g. for control purposes; CII
This page is owned by Office of Patent Classification.
Last Modified: 10/10/2013