Dear Sir, We are Hunan Jingshi group CO.,Ltd. As the larggest manufacturer of zinc sulphate monohydrate in China. Our monthly demond for zinc oxide ore and zinc concentrate is more than 10000MT. The Zn content must be 30% min. If you can supply this matrail, please contact with me. Kind regards, Alex Long Hunan Jingshi Group Co.,Ltd Xiangshi Western Road Shifeng Dist Zhuzhou Hunan China Email: longch_1215(at)yahoo.com.cn Show More