Patent ID: 8679318
Filing Date: 2014-03-25
Classification: C01D,C01F,C25C

Abstract:
1. A method for preparing an electrolyte supplement system in an aluminium electrolysis process which includes low-molecular-ratio cryolite, wherein the low-molecular-ratio cryolite is selected from mKF.AlF 3 , nNaF.AlF 3 or mixture thereof, where m=1˜1.5 and n=1˜1.5, the method for preparing the electrolyte supplement system in the aluminium electrolysis process including the following steps: A) putting aluminium into a reactor, injecting an inert gas into the reactor after vacuumizing, heating the reactor to a temperature of between 700 and 850 DEG C., adding potassium fluoborate; stirring for 4 to 6 hours, then pumping the superstratum melt liquid to obtain potassium cryolite of which the molecular formula is KF.AlF B) adding a mixture of sodium fluoborate and sodium fluotitanate with a mole ratio of 2:1 in the reactor; stirring for 4 to 6 hours, then pumping the superstratum melt liquid to obtain sodium cryolite of which the molecular formula is 6/5 NaF.AlF C) mixing the obtained potassium cryolite KF.AlF