P process of making pig iron in a blast furnace using pellets containing thermoplastic and cellulosic materials
AssigneeSubcoal International B.V.
InventorLars Jennissen
Life of this patent
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Abstract
The use of pellets comprising one or more thermoplastic material(s) of more than 40%, based on the total dry weight of the pellets and one or more cellulosic material(s) of more than 20%, based on the total dry weight of the pellets, as a reducing agent in a process for making pig iron in a blast furnace. The pellets can be provided in unground form, as a partial replacement of coke through the top of the blast furnace, or can be provided as reducing agent in the raceway in an amount of higher than 10 kg/ton iron.
Claims16
Process of making pig iron in a blast furnace having a raceway, said process comprising the steps of:
- a) charging the blast furnace with a top feed comprising an iron ore and coke;
- b) injecting a reducing agent into the blast furnace at the level of one or more tuyeres in the raceway of the blast furnace;
- c) feeding hot air in the raceway of the blast furnace, wherein the blast furnace is furthermore charged with pellets in unground form as a reducing and energy supply agent in an amount of higher than 10 kg/ton iron, said pellets comprising:
- one or more thermoplastic material(s) of more than 40 weight %, based on the total dry weight of the pellets;
- and
- one or more cellulosic material(s) of more than 20 weight %, based on the total dry weight of the pellets
- d) and obtaining pig iron at the bottom of the blast furnace.
Process of making pig iron in a blast furnace, said said process comprising the steps of:
- a) charging the blast furnace with an iron ore and coke;
- b) injecting a reducing agent into the blast furnace at the level of one or more tuyeres in the raceway of the blast furnace;
- c) feeding hot air in the raceway of the blast furnace, wherein the blast furnace is furthermore charged with pellets in unground form as a reducing and energy supply agent in an amount of higher than 10 kg/ton iron, said pellets comprising:
- one or more thermoplastic material(s) of more than 40 weight %, based on the total dry weight of the pellets;
- and
- one or more cellulosic material(s) of more than 20 weight %, based on the total dry weight of the pellets;
- d) and obtaining pig iron at the bottom of the blast furnace;
- wherein said reducing agent in step (b) comprises said pellets;
- wherein the oxygen content of the pellets is in the range of 20 to 30 wt % of the dry weight pellets;
- wherein the hydrogen content of the pellets is in the range of 7 to 8 wt % of the dry weight pellets;
- wherein the pellets have a diameter of between 6 and 20 mm and a length of between 4 and 50 mm.
Dependencies are inferred from the claim text.