Al-al2s3-al(oh)3-al2(so4)3-AL(OH)3-AL2O3
2Al + 3S = Al2S3 Al2S3 + 6KOH = 2Al(OH)3 + 3K2S 2Al(OH)3 + 3Na2SO4 = Al2(SO4)3 + 6NaOH Al2(SO4)3 + 6NaOH = 2Al(OH)3 + 3Na2SO4 2Al(OH)3 = Al2O3 + 3H2O