The Eggshell used in the production of wollastonite will be baked at a temperature of 100 ° C for 24 hours, ground and sieved through 100 mesh and mixed with silica. at the rate of 1: 1 before crushing 5 hours later, put the mixture in a crucible containing boron and nitrogen at a temperature microwave heating 700-1000 ° C for 10 minutes.