1. CPC Sections
  2. CPC Section C
  3. CPC Class C21
  4. CPC Subclass C21B
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CPC
COOPERATIVE PATENT CLASSIFICATION
​​
C21B
MANUFACTURE OF IRON OR STEEL (preliminary treatment of ferrous ores or scrap C22B 1/00; electric heating H05B) [2019-01]
NOTE

  • This subclass covers:
    • the production of iron or steel from source materials, e.g. the production of pig-iron;
    • apparatus specially adapted therefor, e.g. blast furnaces or air heaters.
WARNING

  • In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme.
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) [2017-08]
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 [2020-08]
C21B 7/205
. . .
{Details concerning the gear-box driving the charge distribution system} [2020-08]
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 [2022-01]
C21B 13/023
. .
{wherein iron or steel is obtained in a molten state} [2013-01]
C21B 13/026
. . .
{heated electrically} [2013-01]
C21B 13/029
. .
{Introducing coolant gas in the shaft furnaces} [2022-01]
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
Handling of exhaust gases produced during the manufacture of iron or steel [2022-01]
C21B 2100/20
.
Increasing the gas reduction potential of recycled exhaust gases [2022-01]
C21B 2100/22
. .
by reforming [2017-05]
C21B 2100/24
. .
by shift reactions [2017-05]
C21B 2100/26
. .
by adding additional fuel in recirculation pipes [2017-05]
C21B 2100/28
. .
by separation [2017-05]
C21B 2100/282
. . .
of carbon dioxide [2017-05]
C21B 2100/284
. . .
of nitrogen [2017-05]
C21B 2100/40
.
Gas purification of exhaust gases to be recirculated or used in other metallurgical processes [2022-01]
C21B 2100/42
. .
Sulphur removal [2017-05]
C21B 2100/44
. .
Removing particles, e.g. by scrubbing, dedusting [2017-05]
C21B 2100/60
.
Process control or energy utilisation in the manufacture of iron or steel [2022-01]
C21B 2100/62
. .
Energy conversion other than by heat exchange, e.g. by use of exhaust gas in energy production [2017-05]
C21B 2100/64
. .
Controlling the physical properties of the gas, e.g. pressure or temperature [2017-05]
C21B 2100/66
. .
Heat exchange [2017-05]
C21B 2100/80
.
Interaction of exhaust gases produced during the manufacture of iron or steel with other processes [2022-01]
C21B 2200/00
Recycling of non-gaseous waste material [2017-05]
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]
C21B 2400/00
Treatment of slags originating from iron or steel processes [2020-08]
C21B 2400/02
.
Physical or chemical treatment of slags [2018-08]
C21B 2400/022
. .
Methods of cooling or quenching molten slag [2018-08]
C21B 2400/024
. . .
with the direct use of steam or liquid coolants, e.g. water [2018-08]
C21B 2400/026
. . .
using air, inert gases or removable conductive bodies [2018-08]
C21B 2400/028
. . .
with the permanent addition of cooled slag or other solids [2018-08]
C21B 2400/03
. .
Removing sulfur [2018-08]
C21B 2400/032
. .
Separating slag from liquid, e.g. from water, after quenching [2018-08]
C21B 2400/034
. .
Stirring or agitating by pressurised fluids or by moving apparatus [2018-08]
C21B 2400/04
.
Specific shape of slag after cooling [2018-08]
C21B 2400/042
. .
Sheets [2018-08]
C21B 2400/044
. .
Briquettes or moulded bodies other than sheets [2018-08]
C21B 2400/05
.
Apparatus features [2018-08]
C21B 2400/052
. .
including rotating parts [2018-08]
C21B 2400/054
. . .
Disc-shaped or conical parts for cooling, dispersing or atomising of molten slag rotating along vertical axis [2018-08]
C21B 2400/056
. . .
Drums whereby slag is poured on or in between [2018-08]
C21B 2400/058
. . .
Rotating beds on which slag is cooled [2018-08]
C21B 2400/06
. .
Conveyors on which slag is cooled [2018-08]
C21B 2400/062
. .
Jet nozzles or pressurised fluids for cooling, fragmenting or atomising slag [2018-08]
C21B 2400/064
. .
Thermally-conductive removable bodies, e.g. balls [2018-08]
C21B 2400/066
. .
Receptacle features where the slag is treated [2018-08]
C21B 2400/068
. . .
with a sealed or controlled environment [2018-08]
C21B 2400/07
. . .
open to atmosphere [2018-08]
C21B 2400/072
. . .
Tanks to collect the slag, e.g. water tank [2018-08]
C21B 2400/074
. . .
Tower structures for cooling, being confined but not sealed [2018-08]
C21B 2400/076
. . .
Fluidised bed for cooling [2018-08]
C21B 2400/08
.
with energy recovery [2018-08]