| 摘要 |
PURPOSE: A calcium oxide molding product using limestone powder which has low availability, a manufacturing method thereof and precipitated calcium carbonate using the same are provided to recycle grounded limestone as high quality lime resources by molding and sintering the grounded limestone. CONSTITUTION: A calcium oxide molding product comprises 95-99 wt% of grounded limestone and 1-5 wt% of divalent metal chloride. A manufacturing method of grounded limestone comprises the following step: powdering the limestone having particle size of 20mm or less which is produced in a particle size allocation process. The grounded limestone has the particle size of 200 meshes or less. The divalent metal is one or more of calcium chloride(CaCl2) and magnesium chloride. A quicklime molded body manufacture method comprises the following steps: mixing 1-5 wt% of divalent metal chloride solution having 40-50% concentration with 90-95 wt% of limestone fine powder having particle size of 200 mesh or less for 5-30 minutes; and molding the grounded limestone at a pressure greater than 100kgf/cm^2. [Reference numerals] (AA) Field heaping limestone powder; (BB) Pulverizer (200 meshes); (CC) Mixer; (DD) Divalent metal chloride solution; (EE) Molder; (FF) Dryer; (GG) Kiln waste heat; (HH) Rotary kiln sintering; (II) Cooler; (JJ) Product tank; (KK) Shipping and secondary processing |
