ore is first ground and then roasted at high temperature in large furnaces with soda ash in the presence of oxygen to produce a first contaning Sodium Chromate. This is leached with water and the Sodium Chromate
ore is first ground and then roasted at high temperature in large furnaces with soda ash in the presence of oxygen to produce a first contaning Sodium Chromate. This is leached with water and the Sodium Chromate