C
SECTION C — CHEMISTRY AND METALLURGY
 C

Note(s)

Definitions for Section C:

  • Alkali metals: Li, Na, K, Rb, Cs, Fr
  • Alkaline earth metals: Ca, Sr, Ba, Ra
  • Lanthanides: elements with atomic numbers 57 to 71 inclusive
  • Rare earths: Sc, Y, Lanthanides
  • Actinides: elements with atomic numbers 89 to 103 inclusive
  • Refractory metals: Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W
  • Halogens: F, Cl, Br, I, At
  • Noble gases: He, Ne, Ar, Kr, Xe, Rn
  • Platinum group: Os, Ir, Pt, Ru, Rh, Pd
  • Noble metals: Ag, Au, Platinum group
  • Light metals: alkali metals, alkaline earth metals, Be, Al, Mg
  • Heavy metals: metals other than light metals
  • Iron group: Fe, Co, Ni
  • Non-metals: H, B, C, Si, N, P, O, S, Se, Te, noble gases, halogens
  • Metals: elements other than non-metals
  • Transition elements: elements with atomic numbers 21 to 30 inclusive, 39 to 48 inclusive, 57 to 80 inclusive, 89 upwards

  
METALLURGY
 C21
METALLURGY OF IRON
 C21B
MANUFACTURE OF IRON OR STEEL (preliminary treatment of ferrous ores or scrap C22B 1/00; electric heating per se H05B)
 C21B

Note(s)

This sub-class 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)
 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 (general methods of reducing to metal C22B 5/00; by electrolysis C25C 1/06)
 C21B 15/02
·  Metallothermic processes, e.g. thermit reduction
 C21B 15/04
·  from iron carbonyl