Dear Sir or Madam, We are the biggest manufacturer of Zinc Sulphate in China and per year need about 30000mt zinc raw material and lead raw material.We are very interested to purchase a number of content zinc 20% min raw material and content lead 20% min raw material such as like the zinc ash,zinc dross,zinc concentrate,off-grade zinc oxide,lead ash,lead dross,lead concentrate etc. If your company can provide such as above mentioned material,please kindly send us your specification,suplly quantity,test result along with pictures etc,we purchased and imported with large quantity. Hope to get your soon reply.