Biochemical method of iron elimination and colour characteristics of deferrized porcelain

The flowchart of a two-stage method for removing iron from the composition of porcelain stone is presented: with a combination of bio- and chemical reduction of iron under conditions of stagnant and water humidity regimes. The whiteness of the porcelain stone increases both after aging and after subsequent iron removal operations with a difference in their contribution: washing with ammonium oxalate & gt; magnetic separation & gt; rinsing with water.