加入造粒石墨对低水泥氧化铝基浇注料性能的影响

Effect of pelletized graphite addition on property of low cement alumina based castables

分别采用成型后造粒(A l2O3-C造粒Ⅰ)以及直接造粒(A l2O3-C造粒Ⅱ)两种不同的方法对天然鳞片石墨进行处理。研究了这两种造粒石墨的加入对低水泥氧化铝基浇注料物理性能、抗氧化性能以及抗渣性能的影响。结果表明:1)石墨含量较低、热处理温度较低(110℃)时,含A l2O3-C造粒Ⅰ的试样的常温抗折强度、耐压强度均优于含A l2O3-C造粒Ⅱ的试样的;2)石墨含量较高、热处理温度较高(1 500℃)时,含A l2O3-C造粒Ⅰ的试样的常温抗折强度、耐压强度则不如含A l2O3-C造粒Ⅱ的试样的;3)含同种造粒石墨的试样,其石墨含量越低,抗氧化性能越好;4)石墨含量对含A l2O3-C造粒Ⅱ试样的抗渣侵蚀性影响较大,浇注料中引入A l2O3-C造粒Ⅱ比引入A l2O3-C造粒Ⅰ更有利于改善试样抗渣侵蚀性。

Two different methods,after-forming pelletization （Al2O3 - C pelletization I ） and direct pelletization （Al2O3 -C pelletization II ）, were used to treat the natural flake graphite. Effects of additions of two pelletized graphites on physical property, oxidation resistance and slag resistance of low cement alumina based castables were investigated. The results show that ： （ 1） With lower graphite content and hot-treatment temperature （110 ℃）, both cold modulus of rupture and cold crushing strength of the specimens containing Al2O3 -C pelletization I were higher than those of the specimens containing Al2O3 -C pelletization II. （2） When graphite content and heat-treatment temperature （1500℃） were higher,the results were opposite. （3）For specimens containing the same graphite pelletizations, the lower graphite content was,the better oxidation resistance of specimens was. （4）Graphite content has greater influence on slag resistance of specimens containing Al2O3 -C pelletization II. Adding Al2O3 -C pelletization II to the castables is better than adding Al2O3 -C pelletization I for improving corrosion resistance.