Shandong Useen Calcium Co.,Ltd.was founded in 2021 located in Qingzhou city, close to the provincial highway Bolin Road, convenient transportation and advantageous geographical location. Company covers an area of 600 acres, which has   two business departments of calcium oxide and calcium carbonate. With  4 automatic calcium oxide production lines, 9 calcium carbonate production lines, of which calcium carbonate production capacity is 350,000 tons.