铁尾矿贝利特硫铝酸盐水泥的制备及性能研究

摘要

以首云矿业股份有限公司铁尾矿、低品位矾土等为原料制备铁尾矿贝利特硫铝酸盐水泥,为铁尾矿的高附加值利用探索新的途径.研究结果表明:在生料中铁尾矿、矾土、煅烧石灰石、Al2 O3、CaSO4·2H2O的配比为10∶ 17∶ 48∶ 15∶10,煅烧温度为1 350℃,煅烧时间为20 min条件下,可制备出矿物成分以C4A3S、C2S、C4AF为主,f-CaO含量小于1.5％的铁尾矿贝利特硫铝酸盐水泥熟料.向该熟料中配入与其质量比均为8％的天然石膏和石灰石制成水泥,再按胶砂比为1∶3、水胶比为0.6制成水泥胶砂,胶砂的3d抗压强度达38.1 MPa、28 d抗压强度达52.5 MPa.%With iron tailings and low grade bauxite from Shouyun Mining Company as raw materials,the belite-sulphoaluminate cement clinker was prepared,which proposes a new way for exploring the high added value of iron tailings.The results showed that with the ratio of iron tailings,bauxite,calcined limestone,Al2 O3,CaSO4 · 2H2O of 10∶ 17∶ 48∶ 15∶10 in the raw meal,and at the calcination temperature of 1 350 ℃ for 20 min,belite-sulphoaluminate cement clinker with major components of C4A3S,C2S,C4AF and f-CaO content of less than 1.5％ was prepared.Then,natural gypsum and limestone were added into the clinker with the quality ratio of 8％ to prepare the cement raw meal.With the cement-sand ratio of 1∶3,and water-cement ratio of 0.6,the cement-mortar product reached the compressive strength of 38.1 MPa,at 3 d,and 52.5 MPa at 28 d.