高炉钛渣碳氮化实验研究

Experimental Study on Carbothermal Reduction of Blast Furnace Slag Bearing Titania

利用碳热还原氮化法在1300～1500℃内处理高炉钛渣,用X射线衍射仪、扫描电镜等研究了温度对Ti(C,N)晶粒的生成及其长大的影响。结果表明,实验温度范围内合成钛渣碳氮化后都有Ti(C,N)生成。随温度升高,Ti(C,N)相含量逐渐增多,晶粒明显长大。1450℃时Ti(C,N)相生成最多。与合成钛渣相比,攀钢高炉渣中生成的Ti(C,N)晶粒明显要大,合成钛渣中的为1～3μm,攀钢高炉钛渣中的为3～5μm。攀钢高炉渣中的Ti(C,N)相易附着在金属铁上形成或长大。金属铁提高Ti(C,N)晶粒尺寸效果明显。

Employing slags bearing titania and carbon black as materials, Ti（C,N） were prepared by carbothermal reduction and nitridation between 1300 ℃ and 1500 ℃. The influence of temperature on the formation of Ti（C,N） was investigated by X-ray diffractometry （XRD） and scanning electron microscope （SEM）. The experimental results showed that Ti（C,N） could be produced in synthetic slags under experimental temperature. The content and grain size of Ti（C,N） in the products increased with the increase of temperature. Ti（C,N） phase attained more in number at 1450 ℃. It was found the grain size of Ti（C,N） in Pansteel blast furnace slag bearing titania was bigger than that in synthetic slag. The latter was 1 ～3 μm while the former was 3～5 μm. Ti（C,N） in Pansteel blast furnace slag bearing titania are easy to adhere on the iron to formation and growth. The effect the iron increased the grain size of Ti（C,N） was very obvious.