LAUSR

Abstract In view of the fact that the internal pore structure of electrolytic manganese residue based permeable brick (EMRB) is as difficult to observe as “black box”, which is not conducive to the analysis of its pore structure, this paper combines industrial CT with electrolytic manganese residue based permeable brick to study its pore structure distribution, and makes quantitative statistics and layer-by-layer porosity analysis of each component in electrolytic manganese residue based permeable brick by using digital rock analysis. The internal ball and stick model were built, and the pore radius, volume, shape factor, connectivity (coordination number) and each throat characteristic (throat length, shape factor) connected with it were calculated. In order to establish the relationship between macroscopic permeability coefficient and microscopic pore structure, the pore structure of permeable brick is well displayed by using industrial CT. The results showed that the splitting tensile strength of permeable brick is negatively correlated with the permeability coefficient. To a certain extent, the higher the splitting tensile strength, the lower the permeability coefficient. By scanning the pore structure of the permeable brick, it can be found that the pore in the permeable brick is generally triangular, and the maximum pore can reach 10.46 mm. Through extracting the scanned image to construct the ball and stick model and quantitative statistical results, the parameters such as throat radius, throat length and pore radius of the permeable brick were obtained to characterize the permeability coefficient of the permeable brick, which further verifies the dimensional stability and high throughput of the permeable brick. The pore structure of permeable brick was well characterized by industrial CT, which is an effective method to analyze the pore structure of permeable brick.