How to produce magnesium sulfate heptahydrate via Sulfuric acid process?

Raw materials:Magnesium oxide or magnesium hydroxide or magnesium carbonate and sulfuric acid.

Reaction formula:

MgO+H2SO4+6H2O=MgSO4*7H2O

Mg(OH)2+H2SO4+5H2O=MgSO4*7H2O

MgCO3+H2SO4+6H2O=MgSO4*7H2O

Make an example as Magnesium Oxide:

1.Measure the magnesium oxide ore and sulfuric acid proportionally.

2.Add some water in neutralizing tank, slowly adding magnesium oxide and Stiring it，after that adding sulfuric acid and keep PH=5,Density=1.370g/m³ - 1.384g/m³,Temperature=80℃.

3.Filter the mixture and put it in the crystallizer.

4.Cooled to 30℃ and subjected to centrifugal separation.

5.Put wet material into vibration fluidized bed.

6.Dry it and get Magnesium sulfate heptahydrate at 50℃-55℃