Zinc is extracted from zinc blende. The zinc blende is roasted. The solid product is mixed with coke in a blast furnace from which zinc vapours emerge.
What is the purpose of using coke?

Explanation

To answer the question about the purpose of using coke in the extraction of zinc from zinc blende, we can break down the process step by step.

### Step-by-Step Solution:

1. **Understanding Zinc Blende**:
- Zinc is extracted from zinc blende, which is chemically known as zinc sulfide (ZnS).

2. **Roasting Process**:
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