When the copper content is 20.00%, it will settle normally. Settlement price of copper concentrate = average settlement price of 65438 months+0# electrolytic copper futures of Shanghai Metal Exchange × copper concentrate pricing coefficient+copper grade change price difference.

Copper concentrate price difference table corresponding to copper grade change

2. Deduction of impurities exceeding the standard (gradual deduction)

Normal settlement when (1)p b+ Zn≤8.00%; At 8 o'clock.

(2) Normal calculation of MgO ≤ 4.00%; When 4.00%

(3) Normal settlement when As ≤ 0.40%; When 0.40

(4) Normal settlement when S ≥ 25.00%; When S< is 25.00%, the settlement price will decrease by 20 yuan/ton for every decrease of 1% compared with the standard.