C
SECTION C — CHEMISTRY AND METALLURGY
  
METALLURGY
 C21
METALLURGY OF IRON
 C21B
MANUFACTURE OF IRON AND STEEL
 C21B

Note(s)

This sub-class covers the pretreatment of iron ores, production of pig-iron, blast furnaces, and air heaters.

 C21B 1/00
Pretreatment of iron ores of ferrous material for the production of iron (pretreatment of ores in general C22B; washing and separating of ores B03; furnaces, sintering apparatus F27B)
 C21B 1/02
·  Methods of roasting (C21B 1/10 takes precedence)
 C21B 1/04
·  Removing sulphur, phosphorus, arsenic, other than by roasting
 C21B 1/06
·  Partial reduction, i.e. to a lower state of oxidation
 C21B 1/08
·  Agglomerating, binding, or briquetting iron ores, or intermediate products, e.g. flue dust
 C21B 1/10
·  ·  Sintering
 C21B 1/12
·  ·  ·  in tunnel furnaces
 C21B 1/14
·  ·  ·  in shaft furnaces
 C21B 1/16
·  ·  ·  in rotary furnaces
 C21B 1/18
·  ·  ·  in other apparatus, e.g. pots, sintering machines
 C21B 1/20
·  ·  Binding or briquetting
 C21B 1/22
·  ·  ·  with binders
 C21B 1/24
·  ·  ·  ·  inorganic
 C21B 1/26
·  ·  ·  ·  organic
 C21B 1/28
·  ·  ·  ·  ·  with carbonaceous material for the production of coked agglomerates
 C21B 1/30
·  ·  ·  of ferrous waste or alloys
 C21B 3/00
General features in the manufacture of pig-iron (mixers for pig-iron C21C 1/06)
 C21B 3/02
·  by applying additives, e.g. fluxing agents
 C21B 3/04
·  Recovery of by-products, e.g. slag
 C21B 3/06
·  ·  Treatment of liquid slag (slag wool C03B; slag stones C04B)
 C21B 3/08
·  ·  ·  Cooling slag
 C21B 3/10
·  ·  ·  Slag pots; Slag cars
 C21B 5/00
Making pig-iron in the blast furnace
 C21B 5/02
·  Making special pig-iron, e.g. by applying additives, e.g. oxides of other metals
 C21B 5/04
·  Making slag of special composition
 C21B 5/06
·  Using top gas in the blast furnace process (in coke ovens C10B)
 C21B 7/00
Blast furnaces (lifts associated with blast furnaces B66B 9/06)
 C21B 7/02
·  Internal forms
 C21B 7/04
·  with special refractories (refractory materials C04B)
 C21B 7/06
·  ·  Linings for furnaces
 C21B 7/08
·  Top armourings
 C21B 7/10
·  Cooling; Devices therefor
 C21B 7/12
·  Opening or sealing the tap holes
 C21B 7/14
·  Discharging devices, e.g. for slag
 C21B 7/16
·  Tuyères
 C21B 7/18
·  Bell-and-hopper arrangements
 C21B 7/20
·  ·  with appliances for distributing the burden
 C21B 7/22
·  Dust arresters
 C21B 7/24
·  Test rods or other checking devices
 C21B 9/00
Stoves for heating the blast in blast furnaces
 C21B 9/02
·  Brick hot-blast stoves
 C21B 9/04
·  ·  with combustion shaft
 C21B 9/06
·  ·  Linings
 C21B 9/08
·  Iron hot-blast stoves
 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
 C21B 11/00
Making pig-iron other than in blast furnaces
 C21B 11/02
·  in low shaft furnaces
 C21B 11/06
·  in rotary kilns
 C21B 11/08
·  in hearth-type furnaces
 C21B 11/10
·  in electric furnaces
 C21B 13/00
Making spongy iron or liquid steel, by direct processes
 C21B 13/02
·  in shaft furnaces
 C21B 13/04
·  in retorts
 C21B 13/06
·  in multi-storied furnaces
 C21B 13/08
·  in rotary furnaces
 C21B 13/10
·  in hearth-type furnaces
 C21B 13/12
·  in electric furnaces
 C21B 13/14
·  Multi-stage processes
 C21B 15/00
Other processes for the manufacture of iron from iron compounds (by electrolysis C22D 1/24)
 C21B 15/02
·  Metallothermic processes, e.g. thermit reduction
 C21B 15/04
·  from iron carbonyl