Li_2CO_3对高钛型高炉渣提钛后急冷渣水化性能的影响

Effect of Li_2CO_3 on Hydration Capability of High Titanium Blast Furnace Slag after Extracting Titanium

利用等离子熔融技术提取硅钛合金后的急冷尾渣制备铝酸钙水泥。用化学结合水法、孔径分布、XRD以及SEM分析手段,研究Li2CO3对提钛后急冷残渣水化性能的影响。结果表明:提钛后急冷尾渣主要由玻璃相和部分一铝酸钙(CA)以及镁铝尖晶石(MA)组成,具有一定的水化性能;加入Li2CO3能明显促进急冷渣水化,增强急冷渣砂浆强度,提高水化后孔隙率和初期的结合水量,但Li2CO3加入量不应超过0.1%。

The rapid cooling tailings produced in the process of silicon-titanium alloy extraction from high titanium blast furnace slags by plasma fusion technique were used as raw materials to prepare calcium aluminate cement.The chemically combined water content analysis,pore size distribution test,XRD and SEM were employed to investigate the effect of Li2CO3 on the hydration properties of the tailings.The results show that the rapid cooling tailings,mainly consisting of glass phase and also containing part of calcium aluminate（CA） and magnesia alumina spinel（MA） phases,have weak hydration ability;hydration of the tailings can be significantly promoted,and the mortar strength,porosity after hydration and bounding water in early hydration of the tailings are increased by adding not more than 0.1% Li2CO3.