关键词: 碱渣, 铁尾矿, 核壳结构, 煅烧制度, 烧结陶粒性能, 氯离子渗出率

Abstract: The alkaline residue and fine iron tailings belong to the polluted bulk solid waste， in order to determine the possibility of prepared the high strength and environmental ceramisite using them as main material， the preparation conditions of sintering ceramisite with core-shell structure were investigated， and the mineral composition of sintering ceramisite at the important technological conditions was analyzed. The results indicate that: ① with the dosage increasing of iron tailings and alkaline residue， and calcined temperature increase and calcined time prolonging， the water absorption and expansion rate of sintering ceramisites with core-shell structure increased， as a whole， the cylinder compressive strength of them decreased， which were lower only at the lower calcined temperature and shorter calcined time. ② The sintering ceramisites of core-shell structure with the water absorption of 1.25%， expansion rate of 1.24%， bulk density of 870.3 kg/m3 and cylinder compressive strength of 10.67 MPa were prepared， when the dosage of iron tailings and alkaline residue is 70% and 6%， respectively at the condition of 1 140 ℃ calcined temperature and 90min calcined time， it can meet the requirement of high strength ceramisite in the national standard （for the water absorption＜10%， bulk density grade＜900 kg/m³ and cylinder compressive strength grade＞6.5 MPa）. ③ The chloride exudation rate of the ground product （0.075~0 mm） for this ceramisite was 0.000 1%， which is far lower than that of class I sand （≤0.01%） in the national standard. ④ In the core batch of sintering ceramisite with the core-shell structure， the alkaline residue is the important raw material for promoting the formation of kyanite， which is a key mineral for influencing the cylinder compressive strength of this ceramisite， and the formation of chlorine compound in the ceramisite was promoted through elevating calcined temperature and prolonging the calcined time， and it can prevent the chloride exudation of this ceramisite with the addition of alkaline residue.

Key words: Alkaline residue, Iron tailings, Core-shell structure, Calcined system, Performance of sintering ceramisite, Chloride exudation rate