In order to determine the bulk density of refractory raw materials,the so-called water method following the Archimedes principle is normally used.This is where the effect of water displacement on the mass of the sampl...In order to determine the bulk density of refractory raw materials,the so-called water method following the Archimedes principle is normally used.This is where the effect of water displacement on the mass of the sample is used to determine the bulk volume of the sample grains.During this test procedure,the surface of water infiltrated sample grains must be dried with a wet towel.Experience shows,that this drying step is the main root cause for variation in reproducibility of results and even repeatability of tests.A new spin dryer(centrifuge)was developed and introduced to automate this surface drying step,and is now included as a new method in ISO 8840:2021.The paper discusses the improvement of measurement with the new approach and industrial experiences from two big industrial players in the raw material business.展开更多
文摘In order to determine the bulk density of refractory raw materials,the so-called water method following the Archimedes principle is normally used.This is where the effect of water displacement on the mass of the sample is used to determine the bulk volume of the sample grains.During this test procedure,the surface of water infiltrated sample grains must be dried with a wet towel.Experience shows,that this drying step is the main root cause for variation in reproducibility of results and even repeatability of tests.A new spin dryer(centrifuge)was developed and introduced to automate this surface drying step,and is now included as a new method in ISO 8840:2021.The paper discusses the improvement of measurement with the new approach and industrial experiences from two big industrial players in the raw material business.
