SHANGHAI, Mar 9 (SMM) - Looking forward to March, March has 31 calendar days and more production time will become the main force for output increase in March. At the same time, the new capacity of lead smelters in Henan continued to ramp up, and the production of enterprises such as Yunnan Zhenxing and Hunan Yinxing resumed after maintenance. SMM expects China's primary lead output will rise more than 30,000 mt to 317,000 mt in March.