Cooperative Patent Classification


Version: 2017.02
CPC
COOPERATIVE PATENT CLASSIFICATION
C21B
MANUFACTURE OF IRON OR STEEL (preliminary treatment of ferrous ores or scrap C22B 1/00; electric heating H05B) [2013-01]
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).
C21B 3/00
General features in the manufacture of pig-iron (mixers for pig-iron C21C 1/06) [2013-01]
C21B 3/02
.
by applying additives, e.g. fluxing agents [2013-01]
C21B 3/04
.
Recovery of by-products, e.g. slag [2013-01]
C21B 3/06
. .
Treatment of liquid slag (slag wool C03B; slag stones C04B) [2013-01]
C21B 3/08
. . .
Cooling slag [2013-01]
C21B 3/10
. . .
Slag pots; Slag cars [2013-01]
C21B 5/00
Making pig-iron in the blast furnace [2013-01]
C21B 5/001
.
{Injecting additional fuel or reducing agents} [2013-01]
C21B 5/002
. .
{Heated electrically (plasma)} [2013-01]
C21B 5/003
. .
{Injection of pulverulent coal} [2013-01]
C21B 5/004
. . .
{Injection of slurries} [2013-01]
C21B 2005/005
. .
{Selection or treatment of the reducing gases} [2013-01]
C21B 5/006
.
{Automatically controlling the process} [2013-01]
C21B 5/007
.
{Conditions of the cokes or characterised by the cokes used} [2013-01]
C21B 5/008
.
{Composition or distribution of the charge} [2013-01]
C21B 5/02
.
Making special pig-iron, e.g. by applying additives, e.g. oxides of other metals [2013-01]
C21B 5/023
. .
{Injection of the additives into the melting part} [2013-01]
C21B 5/026
. . .
{of plastic material} [2013-01]
C21B 5/04
.
Making slag of special composition [2013-01]
C21B 5/06
.
Using top gas in the blast furnace process (in coke ovens C10B) [2013-01]
C21B 7/00
Blast furnaces (lifts associated with blast furnaces B66B 9/06) [2013-01]
C21B 7/002
.
{Evacuating and treating of exhaust gases} [2013-01]
C21B 7/005
. .
{Bleeder valves or slides} [2013-01]
C21B 7/007
.
{Controlling or regulating of the top pressure} [2013-01]
C21B 7/02
.
Internal forms [2013-01]
C21B 7/04
.
with special refractories (refractory materials C04B) [2013-01]
C21B 7/06
. .
Linings for furnaces [2013-01]
C21B 7/08
.
Top armourings [2013-01]
C21B 7/10
.
Cooling; Devices therefor [2013-01]
C21B 7/103
. .
{Detection of leakages of the cooling liquid} [2013-01]
C21B 7/106
. .
{Cooling of the furnace bottom} [2013-01]
C21B 7/12
.
Opening or sealing the tap holes [2013-01]
C21B 7/125
. .
{Refractory plugging mass} [2013-01]
C21B 7/14
.
Discharging devices, e.g. for slag [2013-01]
C21B 7/16
.
Tuyéres [2013-01]
C21B 7/163
. .
{Blowpipe assembly} [2013-01]
C21B 7/166
. .
{Tuyere replacement apparatus} [2013-01]
C21B 7/18
.
Bell-and-hopper arrangements [2013-01]
C21B 7/20
. .
with appliances for distributing the burden [2013-01]
C21B 7/22
.
Dust arresters [2013-01]
C21B 7/24
.
Test rods or other checking devices [2013-01]
C21B 9/00
Stoves for heating the blast in blast furnaces [2013-01]
C21B 9/02
.
Brick hot-blast stoves [2013-01]
C21B 9/04
. .
with combustion shaft [2013-01]
C21B 9/06
. .
Linings [2013-01]
C21B 9/08
.
Iron hot-blast stoves [2013-01]
C21B 9/10
.
Other details, e.g. blast mains [2013-01]
C21B 9/12
. .
Hot-blast valves or slides for blast furnaces (valves in general F16K) [2013-01]
C21B 9/14
.
Preheating the combustion air [2013-01]
C21B 9/16
.
Cooling or drying the hot-blast [2013-01]
C21B 11/00
Making pig-iron other than in blast furnaces [2013-01]
C21B 11/02
.
in low shaft furnaces {or shaft furnaces} [2013-01]
C21B 11/06
.
in rotary kilns [2013-01]
C21B 11/08
.
in hearth-type furnaces [2013-01]
C21B 11/10
.
in electric furnaces [2013-01]
C21B 13/00
Making spongy iron or liquid steel, by direct processes [2013-01]
C21B 13/0006
.
{obtaining iron or steel in a molten state} [2013-01]
C21B 13/0013
. .
{introduction of iron oxide into a bath of molten iron containing a carbon reductant} [2013-01]
C21B 13/002
. . .
{Reduction of iron ores by passing through a heated column of carbon} [2013-01]
C21B 13/0026
. .
{introduction of iron oxide in the flame of a burner or a hot gas stream} [2013-01]
C21B 13/0033
.
{In fluidised bed furnaces or apparatus containing a dispersion of the material} [2013-01]
C21B 13/004
.
{in a continuous way by reduction from ores} [2013-01]
C21B 13/0046
.
{making metallised agglomerates or iron oxide} [2013-01]
C21B 13/0053
. .
{On a massing grate} [2013-01]
C21B 13/006
.
{Starting from ores containing non ferrous metallic oxides} [2013-01]
C21B 13/0066
.
{Preliminary conditioning of the solid carbonaceous reductant} [2013-01]
C21B 13/0073
.
{Selection or treatment of the reducing gases} [2013-01]
C21B 13/008
.
{Use of special additives or fluxing agents} [2013-01]
C21B 13/0086
.
{Conditioning, transformation of reduced iron ores} [2013-01]
C21B 13/0093
. .
{Protecting against oxidation} [2013-01]
C21B 13/02
.
in shaft furnaces [2013-01]
C21B 13/023
. .
{wherein iron or steel is obtained in a molten state} [2013-01]
C21B 13/026
. . .
{heated electrically} [2013-01]
C21B 13/04
.
in retorts [2013-01]
C21B 13/06
.
in multi-storied furnaces [2013-01]
C21B 13/08
.
in rotary furnaces [2013-01]
C21B 13/085
. .
{wherein iron or steel is obtained in a molten state} [2013-01]
C21B 13/10
.
in hearth-type furnaces [2013-01]
C21B 13/105
. .
{Rotary hearth-type furnaces} [2013-01]
C21B 13/12
.
in electric furnaces [2013-01]
C21B 13/125
. .
{By using plasma} [2013-01]
C21B 13/14
.
Multi-stage processes {processes carried out in different vessels or furnaces} [2013-01]
C21B 13/143
. .
{Injection of partially reduced ore into a molten bath} [2013-01]
C21B 13/146
. .
{Multi-step reduction without melting} [2013-01]
C21B 15/00
Other processes for the manufacture of iron from iron compounds (general methods of reducing to metal C22B 5/00; by electrolysis C25C 1/06) [2013-01]
C21B 15/003
.
{By using nuclear energy} [2013-01]
C21B 15/006
.
{By a chloride process} [2013-01]
C21B 15/02
.
Metallothermic processes, e.g. thermit reduction [2013-01]
C21B 15/04
.
from iron carbonyl [2013-01]
C21B 2100/00
Exhaust gases [2013-01]
C21B 2100/02
.
Treatment of the exhaust gases [2013-01]
C21B 2100/04
.
Recirculation of the exhaust gases [2013-01]
C21B 2100/06
.
Energy from waste gases used in other processes [2013-01]
C21B 2200/00
Recycling of waste material [2013-01]
C21B 2300/00
Process aspects [2013-01]
C21B 2300/02
.
Particular sequence of the process steps [2013-01]
C21B 2300/04
.
Modeling of the process, e.g. for control purposes; CII [2013-01]