Blast furnace lining having improved thermal conductivity and use life

A blast furnace having an inner surface lined with a blast furnace lining, the blast furnace lining comprising:

• an upper stack portion, an intermediate bosh portion, a lower hearth portion, and a bottom pad portion;
• wherein at least part of the lower hearth portion of the lining includes an outer layer of a first refractory material having a thermal conductivity of at least about 20 W/m-K and an inner layer of a second refractory material having an iron erosion index of less than about 1% and a thermal conductivity of at least about 8 W/m-K;
• and
• the first refractory material includes:
• about 85% to about 95% by weight silicon carbide;
• about 3% to about 10% by weight silica;
• and
• about 0.5% to about 3% by weight alumina.

A blast furnace having an inner surface lined with a blast furnace lining, the blast furnace lining, comprising:

• an upper stack portion, an intermediate bosh portion, a lower hearth portion, and a bottom pad portion;
• wherein at least part of the lower hearth portion of the lining includes an outer layer of a first refractory material having a thermal conductivity of at least about 16 W/m-K and an inner layer of a second refractory material having an iron erosion index of less than about 1% and a thermal conductivity of at least about 8 W/m-K;
• and
• at least part of the bottom pad portion of the lining includes a lower pad layer of the first refractory material having a thermal conductivity of at least about 16 W/m-K and an upper pad layer of the second refractory material having an iron erosion index of less than about 1% and a thermal conductivity of at least about 8 W/m-K.