The correct statement is

Options

A. aniline is a froth stabilizer
B. zincite is a carbonate ore
C. sodium cyanide cannot be used in the metallurgy of silver.
D. zone refining process is used for the refining of titanium.

Answer

To solve the question regarding which statement is correct, we will analyze each of the four statements provided.

### Step-by-step Solution:

1. **Analyze Statement 1: Aniline is a froth stabilizer.**
- Aniline is indeed used as a froth stabilizer in the froth flotation process. This process is used for separating minerals from their ores. Therefore, this statement is **correct**.

2. **Analyze Statement 2: Zincite is a carbonate ore.**
- Zincite has the chemical formula ZnO, which indicates that it is an oxide of zinc, not a carbonate. Carbonate ores typically contain the carbonate ion (CO3) in their structure. Thus, this statement is **incorrect**.

3. **Analyze Statement 3: Sodium cyanide cannot be used in the metallurgy of silver.**
- Sodium cyanide is actually used in the extraction of silver from its ores through the cyanidation process. Therefore, this statement is **incorrect**.

4. **Analyze Statement 4: Zone refining process is used for refining of titanium.**
- The zone refining process is primarily used for purifying semiconductors like silicon and germanium, not titanium. Thus, this statement is also **incorrect**.

### Conclusion:
The only correct statement from the options provided is:
- **Statement 1: Aniline is a froth stabilizer.**