铝电解废阴极炭块水浸研究

对铝电解废旧阴极炭块进行XRD分析，了解物相成分后反复水浸，研究水浸次数及温度对铝电解废旧阴极炭块中不同电解质浸出情况。每次水浸实验采用1~2 mm的废旧阴极炭粒，固液质量比1:5的条件下进行实验，过滤得到水浸液和炭粒，蒸发结晶水浸液并进行物相分析。实验结果表明，铝电解废旧阴极炭浸出蒸发结晶量随温度的升高，第1次浸出蒸发结晶量最大，再次水浸蒸发结晶中氟的百分含量增大。浸出温度增加30 ℃后首次浸出氟含量是升温前第1次浸出和第2次浸出氟含量总和。130 ℃浸出F、Al、Na效果较优。 

Experimental study on water immersion of waste cathode carbon block in aluminum electrolysis

XRD analysis was used to understand the phase composition of waste cathode carbon block in aluminum electrolysis. After that, water leaching was done repeatedly and then the electrolyte leaching situation of the block was studied by the number and temperature of water leaching. Waste cathode carbon particles of 1 ~ 2 mm were used for each experiment of water leaching, under the condition of solid-liquid mass ratio of 1:5. The water leaching solution and carbon particles were obtained through filtration, and the crystallized water leaching solution was evaporated for phase analysis. The experimental results showed that the evaporation crystallization amount of waste cathode carbon in the aluminum electrolysis increased with the increase of temperature, the evaporation crystallization amount of the first leaching was the highest, and the percentage of fluorine in the evaporation crystallization of the second one increased. After the leaching temperature was increased by 30 ℃, the fluorine content of the first leaching was the sum of the first and the second leaching before the temperature rise. F, Al and Na had the best leaching effect at 130 ℃.