Low-molecular-ratio cryolite for aluminium electrolytic industry and method for preparing the same

Abstract

The disclosure provides low-molecular-ratio cryolite for aluminum electrolytic industry, which consists of potassium cryolite and sodium cryolite with a mole ratio of 1:11:3, wherein the molecular formula of the potassium cryolite is mKF.AlF.sub.3 and the molecular formula of the sodium cryolite is nNaF.AlF.sub.3, where m=11.5 and n=11.5. When the low-molecular-ratio cryolite provided by the disclosure is applied to the aluminum electrolytic industry, electrolytic temperature and power consumption can be reduced and electrolytic efficiency is improved.

Claims

1. Low-molecular-ratio cryolite for aluminium electrolytic industry, which consists essentially of a mixture of potassium cryolite and sodium cryolite with a mole ratio of 1:1 to 1:3, wherein the molecular formula of the potassium cryolite is mKF.AlF.sub.3, 1=m1.2; the molecular formula of the sodium cryolite is nNaF.AlF.sub.3, 1=n1.2.

2. The low-molecular-ratio cryolite for aluminium electrolytic industry according to claim 1, wherein m=1 or 1.2; n=1 or 1.2.

3. The low-molecular-ratio cryolite for aluminium electrolytic industry according to claim 1, wherein the mole ratio of the potassium cryolite to the sodium cryolite is 1:1.

4. The low-molecular-ratio cryolite for aluminium electrolytic industry according to claim 1, wherein the mole ratio of the potassium cryolite to the sodium cryolite is 1:3; m=1 and n=1.2.

Description

DETAILED DESCRIPTION OF THE EMBODIMENTS

(1) The disclosure is described below in further detail through specific embodiments.

Embodiment 1

(2) Weighing 1 ton of aluminium and putting it into a reactor, injecting argon to the reactor for protection after vacuumizing, heating the reactor to a temperature of 800 DEG C., adding dried potassium fluotitanate in the reactor slowly in accordance with a reaction ratio and stirring quickly for 5 hours to form titanium sponge and potassium cryolite

(3) 0$\left(\frac{3}{2}\mathrm{KF}.Math.{\mathrm{AlF}}_3\right),$
opening the cover of the reactor, pumping the superstratum melt liquid potassium cryolite through a siphon-pump. Weighing 1 ton of aluminium and putting it into another reactor, injecting argon to the reactor for protection after vacuumizing, heating the reactor to a temperature of 800 DEG C., adding dried sodium fluotitanate in the reactor slowly in accordance with a reaction ratio and stirring quickly for 5 hours to form titanium sponge and sodium cryolite

(4) $\left(\frac{3}{2}\mathrm{NaF}.Math.{\mathrm{AlF}}_3\right),$
opening the cover of the reactor, pumping the superstratum melt liquid sodium cryolite through a siphon-pump.

(5) Mixing the prepared potassium cryolite

(6) $\left(\frac{3}{2}\mathrm{KF}.Math.{\mathrm{AlF}}_3\right),$
with the prepared sodium cryolite

(7) $\left(\frac{3}{2}\mathrm{NaF}.Math.{\mathrm{AlF}}_3\right),$
in a mole ratio of 1:1 and applying the cryolite mixture to the aluminium electrolytic industry, wherein the electrolytic temperature can be controlled in a range of between 850 and 900 DEG C., and virgin aluminium can be obtained by using inert electrode materials or carbon electrode materials or mixed (combination of carbon and inert electrode materials) electrode materials to carry out electrolysis.

Embodiment 2

(8) Weighing 1 ton of aluminium and putting it into a reactor, injecting argon to the reactor for protection after vacuumizing, heating the reactor to a temperature of 780 DEG C., adding dried potassium fluoborate in the reactor slowly in accordance with a reaction ratio and stirring quickly for 5 hours to form boron and potassium cryolite (KF.AlF.sub.3), opening the cover of the reactor, pumping the superstratum melt liquid potassium cryolite through a siphon-pump. Weighing 1 ton of aluminium and putting it into another reactor, injecting argon to the reactor for protection after vacuumizing, heating the reactor to a temperature of 780 DEG C., adding dried sodium fluoborate in the reactor slowly in accordance with a reaction ratio and stirring quickly for 5 hours to form boron and sodium cryolite (NaF.AlF.sub.3), opening the cover of the reactor, pumping the superstratum melt liquid sodium cryolite through a siphon-pump.

(9) Mixing the prepared potassium cryolite (KF.AlF.sub.3) with the prepared sodium cryolite (NaF.AlF.sub.3) in a mole ratio of 1:1 and applying the cryolite mixture to the aluminium electrolytic industry, wherein the electrolytic temperature can be controlled in a range of between 825 and 900 DEG C., and virgin aluminium can be obtained by using inert electrode materials or carbon electrode materials or mixed (combination of carbon and inert electrode materials) electrode materials to carry out electrolysis.

Embodiment 3

(10) Weighing 1 ton of aluminium and putting it into a reactor, injecting argon to the reactor for protection after vacuumizing, heating the reactor to a temperature of 750 DEG C., adding the mixture of dried potassium fluoborate and potassium fluotitanate in the reactor slowly in accordance with a reaction ratio, wherein the mole ratio of the potassium fluoborate to the potassium fluotitanate is 2:1; stirring quickly for 5 hours to form titanium boride and potassium cryolite

(11) $\left(\frac{6}{5}\mathrm{KF}.Math.{\mathrm{AlF}}_3\right),$
opening the cover of the reactor, pumping the superstratum melt liquid potassium cryolite through a siphon-pump. Weighing 1 ton of aluminium and putting it into a reactor, injecting argon to the reactor for protection after vacuumizing, heating the reactor to a temperature of 750 DEG C., adding the mixture of dried sodium fluoborate and sodium fluotitanate in the reactor slowly in accordance with a reaction ratio, wherein the mole ratio of the sodium fluoborate to the sodium fluotitanate is 2:1; stirring quickly for 5 hours to form titanium boride and sodium cryolite

(12) $\left(\frac{6}{4}\mathrm{NaF}.Math.{\mathrm{AlF}}_3\right),$
opening the cover of the reactor, pumping the superstratum melt liquid sodium cryolite through a siphon-pump.

(13) Mixing the prepared potassium cryolite

(14) $\left(\frac{6}{5}\mathrm{NaF}.Math.{\mathrm{AlF}}_3\right)$
with the prepared sodium cryolite

(15) $\left(\frac{6}{5}\mathrm{NaF}.Math.{\mathrm{AlF}}_3\right)$
in a mole ratio of 1:1 and applying the cryolite mixture to the aluminium electrolytic industry, wherein the electrolytic temperature can be controlled in a range of between 825 and 900 DEG C., and virgin aluminium can be obtained by using inert electrode materials or carbon electrode materials or mixed (combination of carbon and inert electrode materials) electrode materials to carry out electrolysis.

Embodiment 4

(16) Mixing the prepared potassium cryolite (KF.AlF.sub.3) with the prepared sodium cryolite

(17) $\left(\frac{6}{5}\mathrm{NaF}.Math.{\mathrm{AlF}}_3\right)$
in a mole ratio of 1:3 and applying the cryolite mixture to the aluminium electrolytic industry, wherein the electrolytic temperature can be controlled in a range of between 850 and 900 DEG C., and virgin aluminium can be obtained by using inert electrode materials or carbon electrode materials or mixed (combination of carbon and inert electrode materials) electrode materials to carry out electrolysis.

Embodiment 5

(18) Mixing the prepared potassium cryolite

(19) $\left(\frac{3}{2}\mathrm{KF}.Math.{\mathrm{AlF}}_3\right)$
with the prepared sodium cryolite (NaF.AlF.sub.3) in a mole ratio of 1:3 and applying the cryolite mixture to the aluminium electrolytic industry, wherein the electrolytic temperature can be controlled in a range of between 850 and 900 DEG C., and virgin aluminium can be obtained by using inert electrode materials or carbon electrode materials or mixed (combination of carbon and inert electrode materials) electrode materials to carry out electrolysis.

Embodiment 6

(20) Mixing the prepared potassium cryolite

(21) 0$\left(\frac{6}{5}\mathrm{KF}.Math.{\mathrm{AlF}}_3\right)$
with the prepared sodium cryolite

(22) $\left(\frac{3}{2}\mathrm{NaF}.Math.{\mathrm{AlF}}_3\right)$
in a mole ratio of 1:3 and applying the cryolite mixture to the aluminium electrolytic industry, wherein the electrolytic temperature can be controlled in a range of between 850 and 900 DEG C., and virgin aluminium can be obtained by using inert electrode materials or carbon electrode materials or mixed (combination of carbon and inert electrode materials) electrode materials to carry out electrolysis.

Embodiment 7

(23) Weighing 5 tons of aluminium and putting it into a reactor, heating the reactor to a temperature of 750 DEG C., adding 2 tons of mixture of dried potassium fluoborate and potassium fluotitanate in the reactor slowly, wherein the mole ratio of the potassium fluoborate to the potassium fluotitanate is 1:1; stirring quickly for 4 hours to form aluminium-titanium-boron alloy and potassium cryolite

(24) $\left(\frac{9}{7}\mathrm{KF}.Math.{\mathrm{AlF}}_3\right)$
due to excessive aluminium, opening the cover of the reactor, pumping the superstratum melt liquid potassium cryolite through a siphon-pump. Weighing 5 tons of aluminium and putting it into a reactor, heating the reactor to a temperature of 750 DEG C., adding 2 tons of mixture of dried sodium fluoborate and sodium fluotitanate in the reactor slowly, wherein the mole ratio of the sodium fluoborate to the sodium fluotitanate is 1:1; stirring quickly for 4 hours to form aluminium-titanium-boron alloy and sodium cryolite

(25) $\left(\frac{9}{7}\mathrm{NaF}.Math.{\mathrm{AlF}}_3\right)$
due to excessive aluminium, opening the cover of the reactor, pumping the superstratum melt liquid sodium cryolite through a siphon-pump.

(26) Mixing the prepared potassium cryolite

(27) $\left(\frac{9}{7}\mathrm{KF}.Math.{\mathrm{AlF}}_3\right)$
with the prepared sodium cryolite

(28) $\left(\frac{9}{7}\mathrm{NaF}.Math.{\mathrm{AlF}}_3\right)$
in a mole ratio of 1:3 and applying the cryolite mixture to the aluminium electrolytic industry, wherein the electrolytic temperature can be controlled in a range of between 850 and 900 DEG C., and virgin aluminium can be obtained by using inert electrode materials or carbon electrode materials or mixed (combination of carbon and inert electrode materials) electrode materials to carry out electrolysis.

(29) The above are the further detailed description of the disclosure made in conjunction with specific preferred embodiments; it can not be considered that the specific embodiment of the disclosure is only limited to the description above. For the common technicians in the technical field of the disclosure, empty simple deductions or substitutes can be made without departing from the concept of the disclosure and they are deemed to be included within the scope of protection of the disclosure.