The reason is: 1, China has not opened futures for the time being, and there is little speculation. 2. The production cost of lead in China is 3000 yuan lower than that of zinc. Because our environmental protection cost is low. 3. Lead can be recycled in large quantities, and these recycling workshops are underground, so the cost is very low. 4. Zinc is not easy to recover, and the production process is much more complicated than lead, so it is suitable for mass production.