The lining of blast furnace is made up of fire clay bricks.

Answer

### Step-by-Step Text Solution:

1. **Understanding the Statement**: The statement provided is that the lining of a blast furnace is made up of fire clay bricks.

2. **Definition of Fire Clay Bricks**: Fire clay bricks are a type of refractory material that can withstand high temperatures without melting. They are specifically designed for use in high-temperature environments, such as furnaces.

3. **Composition of Fire Clay Bricks**: The main components of fire clay bricks are silica (SiO2) and alumina (Al2O3). These materials contribute to their ability to resist high temperatures. Additionally, small amounts of other oxides like calcium (CaO), iron (Fe2O3), titanium (TiO2), and potassium (K2O) may also be present.

4. **Application in Blast Furnaces**: In a blast furnace, the inner lining must withstand extreme heat generated during the smelting process. Fire clay bricks are ideal for this purpose due to their refractory nature.

5. **Conclusion**: Since fire clay bricks are indeed used for the lining of blast furnaces, the statement is true.

### Final Answer:
The statement that the lining of a blast furnace is made up of fire clay bricks is **true**.

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