Aluminum Cold Cathode The Ramming Paste Research,

The placement temperature of cold ramming paste for aluminium electrolysis is 25～50℃against 100℃of hot ramming paste for aluminium electrolysis. The cold ramming paste for aluminium electrolysis can be used at room temperature without heating. The characteristics of the cold ramming paste are as good as hot ramming paste for aluminium electrolysis after roasting. However the placement environment can be improved obviously and the environmental pollution can be reduced greatly. The technology of cold ramming paste for aluminium electrolysis is controlled by some developed counties for example America, Canada, Japan, Norway and so on. The independent technology of cold ramming paste for aluminium electrolysis needs to be developed and applied to production presently because of the technological blockade against our country.The cold ramming paste for aluminium electrolysis has been studied in the paper with electrically calcined anthracite as aggregate, soft pitch as binder, anthroic oil as thinner, metallic Si powder and sulfur powder as additive for binder and adding some graphite and TiB2-The effect of the grain size distribution and the added quantity of anthroic oil on carbonization rata of binder has been studied. The effect of the ratio of blinder on the ash content, volatile components, density of rock, compressive strength, resistively, skeletal density, shrinkage rate and erosion resistance of Na has also been studied. Then the phase analysis has been researched. Finally, the effect of additive added quantity of graphite and TiB2 on the samples has been studied. The results show that:(1) The particle size distribution has a great influence on physical properties. The research on the sample baked show that the physical of sample is best when the particle size distribution parameter (n) is 0.45.(2) The coke yield decreases with increasing the content of anthroic oil. The density of rock is big, the resistively is small and the ash content, volatile components, skeletal density and shrinkage rate is good when the content of anthroic oil is 30%.(3) The density of rock and compressive strength increase because the coke yield of cold ramming paste increases by adding metallic Si powder and sulfur powder. The results show that the compressive strength, density of rock, resistance rate and shrinkage rate of sample is good when the added quantities of metallic Si and sulfur powder are 3% and 2.5% respectively.(4) The resistance rate decreases by adding graphite which also has a negative effect on the compressive strength of sample. The erosion resistance of Na increases by adding TiB2 because the bulge of Na in carbon block cathode decreases.(5)The phase analysis has been researched in the baking process by TGA (thermogravimetric analysis). And the mechanism of thinner has also been studied. Then the researches have a positive effect on the characters of the products.