METHOD FOR MEASURING CONCENTRATION OF CACO3 IN SLURRY

摘要

PURPOSE:To enable continuous measurement of the concn. of CaCO3 in a slurry contg. CaCO3 by controlling the temp. and pH of the slurry to prescribed values, sucking air into the slurry and calculating the respective values of the concn. of CO2 in the gaseous mixture, the sampling flow rate of the slurry and the flow rate of the gaseous mixture. CONSTITUTION:A slurry A is conducted by a metering pump 1 to a reaction vessel 5 and the temp. of stagnating liquid 6 is maintained at >=50 deg.C by using a detector 4 and a temp. controller 3. The pH of the slurry is detected with a pH detector 14 and a micro pump 12 is controlled with a pH controller 15 to feed sulfuric acid C into the vessel 5 thereby controlling the pH of the liquid 6 to <=4. The air B subjected to control of the flow rate by a flow rate controller 11 is sucked through a distributing valve 22 into the liquid 6 and a part of the waste gas F thereof is fed to a CO2 analyzer 19 by which the concn. of CO2 is measured. The detection signal is inputted together with the flow rate signal *1 of the air flowmeter 11 and the flow rate signal *2 of the slurry pump 1 to a calculator 20 which calculates the concn. of CaCO3 in the slurry A by using these signals.