To develop a new orewashing method with addition of chemical reagents for treating bauxite, effects of some chemical reagents on soil ball breaking and bauxite ore washing were investigated.

The desirable deinking and repulping effect on ONP/OMG with sodium sulphite added;

The detachment dynamics of ink for repulping of waste paper

The progress in waste paper repulping,waste paper pulp screening,flotation and bleaching in foreign countries in recent years is introduced in this paper.

According to the documents and results of indoor experiments,this paper recommended proportioning of two kinds of permeable base materials which are composed of asphalt-aggregate of grading type Ⅱ and cement-aggregate of grading type Ⅵ respectively.

Causes of the segregation of cement stabilized macadam mixture and treatment measures;