Patent ID: 8765051

Claim:
Installation for stainless steel production without electrical energy supply based on liquid pig-iron and FeCr solids, in which the liquid pig-iron is heated, refined and alloyed after a pretreatment in a blast furnace, and is subjected to a dephosphorization, desiliconization, desulphurization (DDD) treatment, comprising two classical Argon Oxygen Decarburization with Lance (AOD-L) converters arranged in parallel in a process line following the blast furnace, which each receive a partial quantity of a total pig-iron quantity pretreated in the blast furnace; wherein each of the converters subjects the pig-iron to the DDD treatment, wherein the converters are equipped with side nozzles and a top lance, wherein a first of the AOD-L converters has a top lance whose lance head with three or four holes corresponds to Basic Oxygen Furnace (BOF) blowing technology and a second of the AOD-L converters has a single-hole top lance which is typical for the Argon Oxygen Decarburization (AOD) process, the AOD-L converters being operatively arranged so as to carry out, in a parallel contrary sequence, chemical process steps of heating, and decarbonizing and alloying using autogenic chemical energy, wherein initially the DDD treatment and charging and heating are carried out in the first AOD-L converter and decarbonization is initially carried out in the second AOD-L converter.