High concentration organic wastewater is treated by the methods of slag filter and deep internal circulation.

After pressing balls and drying treatment at chromic filter residue generated during the process of recovery of vanadium by means of different methods,and after adding some volumes of reductant and slagging flux,we smelt the chromic filter residue in the furnace.

The properties and the method of manufacturing and determining phytin and the quality standard of phytin were introduced and the use of the dregs of phytin was expounded.