1, A kinetic property of acidulation process of waste product of iron pyrite is studied, kinetic data of acidulation process are measured.

2, The acidulation behavior of silicates in water-quenched Ti-bearing slag with dilute sulfuric acid was investigated.

3, The dephosphorizing effect by a series filtration, repulping ( acidulation ) and water washing process in WPA production is studied.

4, In the production of nitrophosphates by the mixed acid process the main components of the acidulation tail gas are nitrogen oxides, and the steam condensate from evaporation contains ammonia.

5, The equipment described in this paper as a kind of sewage treatment device possesses the advantages of both hydrolytic acidulation and biological contact oxidation.

6, In the first step KHSO4 is formed from KCl by acidulation using sulphuric acid.

7, The recovery process of lignin from the alkaline reed paper - effluentliquor by acidulation precipitation was studied.

8, The recovery process of lignin from the alkaline reed paper-pulping effluent black liquor by acidulation precipitation was studied.