METHOD OF PRODUCTION OF MICRO-SPHERES Russian patent published in 2005 - IPC

FIELD: production of micro-spheres from fly ash of thermal power stations.

SUBSTANCE: micro-spheres are used as fillers for building materials and light cements and composite materials; they are also used for manufacture of light sealants, putties, dyes, adhesives, composite wood materials, explosives; manufacture of materials sorbing toxic metals at preservation and protracted storage of radioactive wastes. Proposed method of obtaining micro-spheres from aqueous suspension of fly ash of thermal power stations includes hydraulic separation, removal of emersed micro-spheres, dehydration of micro-spheres and drying them. Removal of emersed micro-spheres by means of mobile plant - ejector pump with filtering attachment at rate of suction of aqueous suspension of 20-250 m³/h from surface of pontoon bottom having area of 5-100 m² which is pressed to lower layer of micro-spheres by fractions in multi-stage rotary drum-type classifier provided with self-cleaning surfaces of screens for screening-out the micro-spheres.

EFFECT: enhanced efficiency and technical reliability; intensification of micro-sphere extraction process.

4 cl, 3 tbl, 1 ex