CONCLUSION:Compound ferrous sulfate and folic acid tablets are optimal therapeutic scheme for iron deficiency anemia in pregnant women.

Preparation of ferrous sulfate sustained-release tablets

Study on ferrous sulfate microencapsulation;

Preparation of nanometer ferric oxide from ferrous sulfate by liquid phase method;

Preparation of highpurity manganese dioxide by leaching manganese ore with ferrous sulfate from by-product of titanium white;

There is a vice-product FeSO4 in the process.

FeSO4 is used as coagulation agent in pretreatment process,the activated sludge process and biological contact oxidation process are jointly applied in the aerobic treatment stage.

The ferrous sulphate is obtained in the way that pyrite cinder is first deoxidized via roasting;then leached with acid,treated through pH value adjustment,provided with flocculant and finally settled.

This article has reported the existing of secondary seed-real seed during synthesis of ammonium neutralized iron oxide by use of ferrous sulphate and described the forming process of real seed in the early stage of oxidation(two-step oxidation).

In order to treat the wastewater from vat blue production,we obtain ferrous sulphate as water treatment chemical and incinerate residue in general coal-fired boiler.