On the eve of the annual meeting of the national Calcium carbonate industry on April 28, in order to promote the development concept of new quality productivity, Ye Lijun, Secretary General of the China Inorganic Salt Industry Association, Hu Yongqi, president of the calcium carbonate industry branch, and Hao Zhigang, secretary General, led the secretariat and some experts to Shandong Useen Calcium Co.,Ltd. Go on a tour.