Dissolution rate determination of alumina in molten cryolite-based aluminum electrolyte

来源期刊:中南大学学报(英文版)2012年第4期

论文作者:阚洪敏 张宁 王晓阳

文章页码:897 - 902

Key words:aluminum electrolyte; dissolution rate; image analysis; alumina; Gabor wavelet transform

Abstract: Determination of dissolution rate of alumina is one of the classical problems in aluminum electrolysis. A novel method which can measure the dissolution rate of alumina was presented. Effect of factors on dissolution rate of alumina was studied intuitively and roundly using transparent quartz electrobath and image analysis techniques. Images about dissolution process of alumina were taken at an interval of fixed time from transparent quartz electrobath of double rooms. Gabor wavelet transforms were used for extracting and describing the texture features of each image. After subsampling several times, the dissolution rate of alumina was computed using these texture features in local neighborhood of samples. Regression equation of the dissolution rate of alumina was obtained using these dissolution rates. Experiments show that the regression equation of the dissolution rate of alumina is y=?0.000 5x3+0.024 0x2?0.287 3x+ 1.276 7 for Na3AlF6-AlF3-Al2O3-CaF2-LiF- MgF2 system at 920 °C.

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