掺入铁合金渣对赤泥陶瓷性能和颜色的影响

Effect of ferroalloy slag on the properties and color of red mud ceramics

在赤泥陶瓷原料中协同掺入锰铁渣、铬铁渣并制备了赤泥陶瓷样品,利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)等测试手段,对矿相、微观形貌与结构、物理性能等进行分析,将化学试剂MnO和Cr_(2)O_(3)掺入赤泥并对其进行对比,研究铁合金渣对赤泥陶瓷性能和颜色的影响规律。结果表明,赤泥陶瓷中加入锰铁渣会变为黑色,而加入铬铁渣赤泥陶瓷未显著变色;赤泥陶瓷变色的主要原因是锰铁渣中Mn^(2+)能与赤泥中Fe^(3+)反应生成MnFe_(2)O_(4)尖晶石类矿物,该类矿物的析出使赤泥陶瓷变为黑色。在低于1140℃时,与赤泥协同铬铁渣相比,赤泥协同锰铁渣制备的陶瓷性能更优,其抗折强度可达33.16 MPa,吸水率为1.65%;当温度继续升高后,赤泥协同锰铁渣制备的赤泥陶瓷出现过烧,性能逐渐下降。

In this paper,red mud ceramic samples with different appearances were prepared by adding ferromanganese slag and ferrochromium slag into the red mud ceramic raw materials.The mineral phases,microstructures and physical properties were analyzed using X-ray diffractometer(XRD),scanning electron microscope(SEM)and performance test.Furthermore,the effects of ferroalloy slag on the properties and colors of red mud ceramics were analyzed by the incorporation of chemical reagents MnO and Cr_(2)O_(3).The results show that the addition of ferromanganese slag made the red mud ceramics black,but the addition of ferrochromium slag didn’t significantly change their color.The major reason for the discoloration of red mud ceramics is that Mn^(2+)in ferromanganese slag can react with Fe^(3+)in red mud to form spinel minerals of MnFe_(2)O_(4),making red mud ceramics black.Below 1140℃,the properties of red mud ceramics prepared by red mud and ferromanganese slag are better than those with red mud and ferrochromium slag,and its flexural strength can reach 33.16 MPa and the water absorption rate is 1.65%.However,the red mud ceramics prepared by red mud and ferromanganese slag will exhibit oversintering,and their properties will gradually decline as the temperature continues to rise.