In the paper,the development in preparing ultrafine explosive at home and abroad is comprehensively analyzed,and a disquisitive content was set up by consulting the domestic and overseas correlative datum,that is NTO ultrafine and particle gradation with using supercritical CO2 anti-solvent.

The present development of the explosive of thinning and particle gradation both hereand abroad is summarized in the paper.

In order to guarantee that the products of spinelbased inert anode possess high volume density and low porosity, based on the theory of ball arrangement and started with grain composition of the raw material, the grain graduation of spinel was studied experimentally.

Based on the service conditions of the lance for molten iron pretreatment,this paper analyzes the grain size distribution and the selection of the micro-powder and admixtures,and probes into the influences of introducing the andalusite and carborundum on its thermal shock resistance and slag resistance.