| 摘要 |
The particle size and particle size distribution of the particulate TiO2 solids in a solids burdened reaction product gas produced in a vapor phase process for making pyrogenic TiO2 are measured by diluting a sample of the solids burdened gas by an order of magnitude of at least about 1012 and feeding the diluted sample to measuring-means in the form of a multi-channel light scattering sensor the read-out of which constantly measures the particle size and particle size distribution of the particulate solids in the reaction product gases being produced. It is, of course, well known that particle size and particle size distribution of particulate TiO2 particles may be correlated with the optical properties of the pigment. Hence the read-out of the light scattering sensor will be indicative of the quality of TiO2 pigment being produced and may be usedd manually i.e. visual observation or by electronic means to effect adjustments in the appropriate plant operational controls so as to maintain the optical properties of the pigment substantially constant and at optimum levels throughout a plant run.
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