METHOD FOR MONITORING AND CONTROLLING HOLDING OF CHEMICAL COMPONENT IN WATER/CELLULOSE SLURRY TO BE TREATED

摘要

PURPOSE: To perform measurement based on the reflection of light while recognizing the difference between a chemical component of low concentration and fine fibers by obtaining the data of near infrared spectrum continuously while adding clay to a liquid sample of low concentration and then analyzing a slurry through a computer. CONSTITUTION: A series of near infrared spectrum are read out for a series of samples having known composition prepared by varying the content of chemical components in a low concentration liquid sample of a water/cellulose slurry. A near infrared radiation signal is then projected to a liquid containing the sample in order to scan the liquid over a near infrared spectrum of 1000-2500nm and the spectrum to be recorded by the radiation signal is read out. Subsequently, a data obtained from liquid samples having gradually increasing content is combined with the readings of spectrum obtained for the composition of chemical components to produce a weight data which is subjected to linear regression analysis through a computer thus obtaining a characteristic equation of chemical components.