Reasons for exceeding the standard of cathode copper and bismuth

1. Raw material quality problem: In the production process, the raw materials used contain too much bismuth, resulting in the final product bismuth exceeding the standard.

2. Production process: During the preparation of cathode copper, improper control of process parameters such as temperature, time, current and voltage will lead to bismuth exceeding the standard, so the production process needs strict management and control.

3. Detection method: Incorrect detection method or improper selection of cathode copper and bismuth content will lead to bismuth exceeding the standard.

4. Other factors: aging equipment, improper maintenance, insufficient skills of operators and other factors will lead to excessive copper and bismuth in cathode.