| 摘要 |
PURPOSE:To quantify transported liquid chemical by transporting liquid chemical from a liquid chemical storage tank to a reaction tank through a main duct, then allowing passage of the chemical to a hydrometer in a bypass duct, determining a transport amount by calculation based on data obtained by the hydrometer and controlling a solenoid valve on the main duct. CONSTITUTION:A main duct 15 for transporting liquid chemical is connected to an area between a liquid chemical storage tank 11 and a reaction tank 13. A solenoid valve 16 and a flow meter 18 are provided on this main duct 15. In addition, bypass ducts 20 are connected in parallel to the solenoid valve 16 and the flow meter 18. Further, a calculation processing device 25 calculates and determines a transport amount based on data obtained by a hydrometer 22 provided in the bypass duct 20, and controls the solenoid valve 16 in the main duct 15. Consequently, liquid chemical at varying specific gravity can be quantitatively transported for an estimated product weight after reaction. Subsequently, the yield of a reaction product based on the above-described liquid chemical is stabilized. For instance, the yield of ZnS which becomes a main component of a sulfide fluorescent material for a color cathode ray tube is stabilized. |
