Study on the preparation and properties of beryllium waste residue ceramics
In order to implement the resource utilization of waste residue containing beryllium,beryllium waste residue ceramics with high performance were prepared by direct solidification molding method,with waste residue containing beryllium as one of the raw materials,silica,alumina and magnesium oxide as ag-gregates,Portland cement as binder,and calcium oxide,fly ash along with titanium dioxide as composite additives.The effects of additive ratio and calcination conditions on the leaching concentration of Be were in-vestigated.The microstructure,strength density and heat resistance of sintered samples prepared at different aging time,holding time and calcination temperature were studied.The results showed that when the ratio of aggregate,beryllium waste residue,portland cement and composite additives(among which the ratio of calcium oxide,fly ash and titanium dioxide was 5∶5∶1)was 60.8∶4∶6∶11,the leaching con-centration of Be in the beryllium waste residue ceramics was lower than the national standard limit,and it can be reduced to as low as 0.010 7 mg·L-1 after adjusting the preparation parameters.Besides,the sample had good compressive strength and heat resistance.The optimum preparation conditions were aging for 8 h and calcination at 1 200 ℃ for 4 h.This technology can provide an effective way for the comprehen-sive utilization of waste residue containing beryllium.
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