US2013092552A1PendingUtilityA1
Potassium cryolite for aluminum electrolysis industry and preparation method thereof
Assignee: SHENZHEN SUNXING LIGHT ALLOYS MATERIALS CO LTDPriority: May 23, 2012Filed: Dec 9, 2012Published: Apr 18, 2013
Est. expiryMay 23, 2032(~5.8 yrs left)· nominal 20-yr term from priority
C01F 7/54C25C 3/18
56
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Claims
Abstract
The invention provides a potassium cryolite for aluminum electrolysis industry, which has a molecular formula: mKF.AlF 3 , wherein m is from 1 to 1.5. The low-molecular-ratio potassium cryolite (mKF.AlF 3 , and m is from 1 to 1.5) provided by the invention is used for aluminum electrolysis industry, and can improve the dissolvability of aluminum oxide, thus reducing the temperature of electrolysis and the consumption of power, raising the efficiency of electrolysis and lowering the comprehensive production cost.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A potassium cryolite for aluminum electrolysis industry, characterized in that: the potassium cryolite has a molecular formula: mKF.AlF 3 , wherein m is from 1 to 1.5.
2 . A preparation method of potassium cryolite for aluminum electrolysis industry according to claim 1 , wherein the method comprises the following steps:
A) aluminum is put in a reactor, which is heated up to 700-850° C. and then added with potassium fluotitanate, potassium fluoborate or the mixture thereof (sodium fluorotitanate, sodium fluoborate or the mixture thereof); and B) after the mixture in the reactor is stirred for 4-6 hours, liquid molten at the upper layer is sucked out to obtain potassium cryolite.
3 . The preparation method of potassium cryolite for aluminum electrolysis industry according to claim 2 , wherein the method comprises the following steps:
A) aluminum is put in a reactor that is a closed container, inert gas is fed into the reactor after evacuation, and the reactor is heated up to 780-850° C. and then added with potassium fluotitanate; and B) after the mixture in the reactor is stirred for 4-6 hours, liquid molten at the upper layer is sucked out to obtain potassium cryolite having a chemical formula:
3
2
KF
·
AlF
3
.
4 . The preparation method of potassium cryolite for aluminum electrolysis industry according to claim 2 , wherein the method comprises the following steps:
A) aluminum is put in a reactor that is a closed container, inert gas is fed into the reactor after evacuation, and the reactor is heated up to 700-850° C. and then added with potassium fluoborate; and B) after the mixture in the reactor is stirred for 4-6 hours, liquid molten at the upper layer is sucked out to obtain potassium cryolite having a chemical formula: KF.AlF 3 .
5 . The preparation method of potassium cryolite for aluminum electrolysis industry according to claim 2 , wherein the method comprises the following steps:
A) aluminum is put in a reactor that is a closed container, inert gas is fed into the reactor after evacuation, and the reactor is heated up to 700-850° C. and then added with the mixture of potassium fluoborate and potassium fluotitanate based on a molar ratio of 2:1; and B) after the mixture in the reactor is stirred for 4-6 hours, liquid molten at the upper layer is sucked out to obtain potassium cryolite having a chemical formula:
6
5
KF
·
AlF
3
.
6 . The preparation method of potassium cryolite for aluminum electrolysis industry according to claim 2 , wherein the method comprises the following steps:
A) aluminum is put in a reactor, which is heated up to 700-850° C. and then added with the mixture of potassium fluoborate and potassium fluotitanate based on a molar ratio of y:x; and B) after the mixture in the reactor is stirred for 0.5-6 hours, liquid molten at the upper layer is sucked out to obtain potassium cryolite having a chemical formula:
3
y
+
6
x
3
y
+
4
x
KF
·
AlF
3
.
7 . The potassium cryolite for aluminum electrolysis industry according to claim 1 , wherein the m is 1, 1.2 or 1.5.
8 . A preparation method of potassium cryolite for aluminum electrolysis industry according to claim 7 , wherein the method comprises the following steps:
A) aluminum is put in a reactor, which is heated up to 700-850° C. and then added with potassium fluotitanate, potassium fluoborate or the mixture thereof (sodium fluorotitanate, sodium fluoborate or the mixture thereof); and B) after the mixture in the reactor is stirred for 4-6 hours, liquid molten at the upper layer is sucked out to obtain potassium cryolite.
9 . The preparation method of potassium cryolite for aluminum electrolysis industry according to claim 8 , wherein the method comprises the following steps:
A) aluminum is put in a reactor that is a closed container, inert gas is fed into the reactor after evacuation, and the reactor is heated up to 780-850° C. and then added with potassium fluotitanate; and B) after the mixture in the reactor is stirred for 4-6 hours, liquid molten at the upper layer is sucked out to obtain potassium cryolite having a chemical formula:
3
2
KF
·
AlF
3
.
10 . The preparation method of potassium cryolite for aluminum electrolysis industry according to claim 8 , wherein the method comprises the following steps:
A) aluminum is put in a reactor that is a closed container, inert gas is fed into the reactor after evacuation, and the reactor is heated up to 700-850° C. and then added with potassium fluoborate; and B) after the mixture in the reactor is stirred for 4-6 hours, liquid molten at the upper layer is sucked out to obtain potassium cryolite having a chemical formula: KF.AI F 3 .
11 . The preparation method of potassium cryolite for aluminum electrolysis industry according to claim 8 , wherein the method comprises the following steps:
A) aluminum is put in a reactor that is a closed container, inert gas is fed into the reactor after evacuation, and the reactor is heated up to 700-850° C. and then added with the mixture of potassium fluoborate and potassium fluotitanate based on a molar ratio of 2:1; and B) after the mixture in the reactor is stirred for 4-6 hours, liquid molten at the upper layer is sucked out to obtain potassium cryolite having a chemical formula:
6
5
KF
·
AlF
3
.
12 . The preparation method of potassium cryolite for aluminum electrolysis industry according to claim 8 , wherein the method comprises the following steps:
A) aluminum is put in a reactor, which is heated up to 700-850° C. and then added with the mixture of potassium fluoborate and potassium fluotitanate based on a molar ratio of y:x; and B) after the mixture in the reactor is stirred for 0.5-6 hours, liquid molten at the upper layer is sucked out to obtain potassium cryolite having a chemical formula:
3
y
+
6
x
3
y
+
4
x
KF
·
AlF
3
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