白云尾矿与转炉渣制备烧结透水砖及性能研究

Study on Preparation and Properties of Fired Permeable Brick by Baiyun Obo Tailings and Converter Slag

为充分利用白云鄂博再选尾矿和包钢转炉渣,以其为原料采用高温煅烧的方式制备烧结透水砖。结果表明:选定钢渣骨料级配5~10 mm∶2.5~5 mm∶0~2.5 mm=4∶3∶3,最佳方案为尾矿掺量25%,成型压力30MPa,烧结温度1180℃,保温时间50 min,此时透水砖的粘结相为镁铁尖晶石相和硅酸钙相,抗压强度为28 MPa,透水系数为0.091 cm/s,均优于国标《烧结普通砖》(GB/T 5101-2017)中MU25(25 MPa)的抗压强度要求和《透水路面砖和透水路面板》(GB/T 25993-2010)中A级0.02cm/s的透水系数要求。

In order to fully utilize the Baiyun Obo re-election tailings and the converter slag from Baotou Steel,a high-temperature calcination method was employed to prepare sintered permeable bricks using them as raw materials.The results showed that the selected aggregate grading of the steel slag is 5 ~10 mm ∶ 2.5 ~ 5 mm ∶ 0 ~ 2.5 mm=4 ∶ 3 ∶ 3.The optimal scheme included tailings content of 25%,molding pressure of 30 MPa,sintering temperature is 1180 ℃,and an insulation time of 50 minutes.At this condition,the binding phases of the permeable bricks are magnesium iron spinel phase and calcium silicate phase,exhibiting a compressive strength of 28 MPa and a permeability coefficient of 0.091 cm/s,both of which exceed the requirements of the national standard “Fired Common Bricks”(GB/T 5101-2017) for MU25(25 MPa) compressive strength and the requirements of “Permeable Paving Bricks & Permeable Paving Flags”(GB/T 25993-2010) for Grade A with a permeability coefficient of 0.02 cm/s.