Take first-grade metallurgical coke and second-grade metallurgical coke as samples. Classification reflects the price change trend of China coke market. The base period is 2006 1 month, and the base period index is set to 100. The standards of primary metallurgical coke and secondary metallurgical coke are as follows (Table 1):

Table 1 standard ash A d/% of primary metallurgical coke and secondary metallurgical coke:

Meet; 40 mm ash a d/%:< 13.5, sulfur content standard /%:< 0.8.

Meet; 40 mm