Method for preparing an electrolyte and an electrolyte replenishment system during aluminum electrolysis process
The disclosure provides a method for preparing an electrolyte and an electrolyte replenishment system during an electrolytic process. The method includes the following steps: Step A: placing aluminum in a reactor, vacuumizing the reactor and feeding an inert gas, heating the reactor to 700-850 degrees centigrade, and adding one or more of potassium fluozirconate, potassium fluoborate, sodium hexafluorozirconate and sodium fluoroborate; and Step B: stirring the reactants for 4-6 hours and extracting the upper molten liquid to obtain an electrolyte replenishment system during an aluminum electrolysis process. The disclosure has the following beneficial effects: when used in the aluminum electrolysis industry, the electrolyte system provided herein can be directly used as an aluminum electrolyte or a replenishment system in an electrolyte without changing existing electrolysis technology to significantly reduce an electrolysis temperature during an aluminum electrolysis process.
1. A method for preparing an electrolyte comprising the following steps of:
Step A: placing aluminum in a reactor, vacuumizing the reactor and feeding an inert gas, heating the reactor to 700-850 degrees centigrade, and adding only potassium fluozirconate; and
Step B: stirring for 4-6 hours and extracting an upper molten liquid to obtain only zirconium sponge and an
3
2
KF
·
AlF
3
electrolyte according to a reaction formula of
Al
+
3
4
K
2
ZrF
6
=
3
4
Zr
+
3
2
KF
·
AlF
3
so as to replenish the
3
2
KF
·
AlF
3
electrolyte during an electrolytic process.
2. A method for preparing an electrolyte during an electrolytic process, including the steps of:
Step A: placing aluminum in a first reactor, vacuumizing the first reactor and feeding inert gas, heating the first reactor to 700-850 degrees centigrade, adding only a first reactant of potassium fluozirconate, stirring 4-6 hours and extracting a first upper molten liquid to obtain only zirconium sponge and a potassium AlF 3 cryolite; and placing aluminum in a second reactor, vacuumizing the second reactor and feeding inert gas, heating the second reactor to 700-850 degrees centigrade, adding only a second reactant of sodium hexafluorozirconate, stirring for 4-6 hours and extracting a second upper molten liquid to obtain only zirconium sponge and a sodium AlF 3 cryolite; and
Step B: mixing the obtained potassium cryolite with the obtained sodium cryolite in a molar ratio of 1:1 to 1:3.
3. The method for preparing an electrolyte during an electrolytic process according to claim 2 , comprising the steps of:
in said Step A: extracting the first upper molten liquid to obtain the potassium cryolite the molecular formula of which is
3
2
KF
·
AlF
3
;
and extracting the second upper molten liquid to obtain the sodium cryolite the molecular formula of which is
3
2
NaF
·
AlF
3
;
and
in said Step B: mixing the obtained potassium cryolite
3
2
KF
·
AlF
3
with the obtained sodium cryolite
3
2
NaF
·
AlF
3
in a molar ratio of 1:1 to 1:3.
4. A method for preparing an electrolyte comprising the steps of:
Step A: placing aluminum in a reactor, vacuumizing the reactor and feeding an inert gas, heating the reactor to 700-850 degrees centigrade, and adding only sodium hexafluorozirconate; and
Step B: stirring for 4-6 hours and extracting an upper molten liquid to obtain only zirconium sponge and an
3
2
NaF
·
AlF
3
electrolyte during an aluminum electrolysis process according to a reaction formula of
Al
+
3
4
Na
2
ZrF
6
=
3
4
Zr
+
3
2
Na
F
·
AlF
3
.