The porosity of the aluminum liquid ceramic filter refers to the percentage of the total volume of pores in the filter plate product to the total volume of the filter plate product. The porosity determines the filtration capacity of the aluminum liquid ceramic filter plate per unit volume. The higher the flow rate of the plate filter, the stronger the filter capacity, and vice versa.
At present, there are two main methods for measuring porosity:
Method 1: Calculate the volume of the holes in the filter plate according to Archimedes’ law.
That is, pour water into a glass beaker with an overflow tube until the water flows out of the overflow tube. When the water no longer flows out, gently place all the samples to be tested in the water. At this time, the water flows out from the overflow pipe, and the volume of the water in this part is measured. Subtract the volume of overflowed water from the physical volume of the filter plate to give the total volume of the holes in the filter plate.
Method 2: first measure the true density and bulk density of the filter plate sample to be tested, and then calculate the porosity of the sample according to the formula.
Both methods have advantages and disadvantages. Method 1 The operation process is simple and convenient, and the detection speed is fast, but its fatal weakness is that the filter plate material itself has the characteristics of water absorption, so the volume of water discharged is less than the actual volume, which causes the measured data to be too small.
Although the test process of method 2 is more complicated, the influence caused by the water absorption of the filter plate material is excluded in the test process, and the obtained data is relatively accurate. The porosity index of the aluminum liquid ceramic filter plate is greater than 84%.