The degree of silicic acid is the ratio of the total amount of acidic oxides in the slag to the total amount of oxygen in the basic oxide. Usually indicated by the letter K, the slag of K = acidic oxygen / basic oxysilicic acid higher than 1 is acidic slag, and vice versa is alkaline slag. Silicate slag refining of gold with a generally K = 1 ~ 2. Bass Series Vacuum Cleaner,Professional Vacuuming Tool,Portable Vacuum Cleaner,Car Washing Vacuum Cleaner Haotian Cleaning Equipment Technology Co.,Ltd. , https://www.vacuumcleanersupply.com