CN103643050B - A kind of method utilizing high alumina pre-melted slag to produce aluminum oxide - Google Patents
A kind of method utilizing high alumina pre-melted slag to produce aluminum oxide Download PDFInfo
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- CN103643050B CN103643050B CN201310682936.2A CN201310682936A CN103643050B CN 103643050 B CN103643050 B CN 103643050B CN 201310682936 A CN201310682936 A CN 201310682936A CN 103643050 B CN103643050 B CN 103643050B
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- high alumina
- melted slag
- aluminum oxide
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The present invention relates to a kind of preparation method utilizing high alumina pre-melted slag to use alumina producing Bayer process, belong to metallurgical solid field of waste resource comprehensive utilization.This alumina-producing method is with addition of bauxite main material with high alumina pre-melted slag for auxiliary material, uses the Bayer process technological process of production to carry out alumina producing.The present invention can effectively utilize high alumina pre-melted slag, reduce the production cost of commercial alumina simultaneously, wherein the aluminum oxide in bauxite relative to dissolution rate up to more than 95%, the present invention effectively make use of discarded secondary resource high alumina pre-melted slag, achieve the zero-emission of this waste residue, there is preferable industrialization prospect simultaneously.
Description
Technical field
The invention belongs to metallurgical solid field of waste resource comprehensive utilization, particularly relate to one and utilize high alumina pre-melted slag to produce aluminum oxide
Method, high alumina pre-melted slag is for the lime replacing in original production method.
Background technology
Using smelting reduction process to produce in the smelting process of alloy, in addition to obtaining respective objects ferroalloy, also can produce substantial amounts of
Tailings, wherein high alumina pre-melted slag is exactly a kind of produced secondary residue during alloy smelting, and its dominant is with calcium aluminate
It is main with magnesium aluminate spinel.Its main component percentage by weight is Al2O350～60%, CaO 15～25%, SiO21～3%,
MgO3～8%, TiO2Content is less than 2%, and remaining is inevitable impurity；Thus effectively utilize this slag to be possible not only to solve
The sedimentary environment problem certainly brought because of a large amount of industrial residues, has certain economic benefit simultaneously.
At present, the bauxite resource that China's aluminum oxide industry uses is mainly diaspore type bauxite, wherein contains TiO2About
2～3%.During bauxite high pressure digestion, due to TiO2Retardation, the aluminum oxide in ore can be made to be difficult to the most molten
Go out.For eliminating TiO2Harm, when diaspore type bauxite high pressure digestion generally be required for add lime, typically add
Amount is 7～10%, is more up to 15～20% in lime bayer method.The high alumina pre-melted slag that the present inventor uses in advance contains
There is CaO about 22%, if utilizing CaO therein to replace lime for Bayer digestion of bauxite dissolution, it will bring significant economy
Benefit.
Existing alumina-producing method is:
A, dispensing: lime 15～20%, bauxite 80-85%；
B, employing alumina producing Bayer process.
Wherein, step B uses alumina producing Bayer process concrete grammar as follows:
Mixing bauxite and lime, be subsequently adding 200g/L concentration sodium carbonate liquor and under the conditions of 220 DEG C molten 2 hours of alkali,
Obtain sodium aluminate solution；After sodium aluminate solution separates with residue, reduce temperature, add aluminium hydroxide and make crystal seed, through long-time (12
Hour) stirring, sodium aluminate decomposes precipitation aluminium hydroxide, cleans, and at 950～1200 DEG C of temperature lower calcinations, just obtains aluminum oxide.
Summary of the invention
The mesh of the present invention is to provide a kind of method utilizing high alumina pre-melted slag to produce aluminum oxide, has and utilizes secondary waste resource, nothing
Public hazardsization effectively utilize, and the advantage reducing alumina production cost.
The inventive method is:
A, dispensing: high alumina pre-melted slag 15～20%, bauxite 80-85%；
B, employing alumina producing Bayer process.
Step B uses alumina producing Bayer process concrete grammar as follows:
1) mixing bauxite and high alumina pre-melted slag, is subsequently adding the preferred 200g/L of 150-250g/L() sodium carbonate liquor and
Molten 1-3 hour of alkali (preferably 2 hours) under the conditions of 200-280 DEG C (preferably 220 DEG C), filters, obtains sodium aluminate solution；
2) sodium aluminate solution reduction temperature is to 50-75 DEG C, adds aluminium hydroxide and makees crystal seed, through long-time (12 hours) stirring,
Sodium aluminate decomposes precipitation aluminium hydroxide, cleans, and at 950～1200 DEG C of temperature lower calcinations, obtains aluminum oxide.
The key point of technical solution of the present invention is with high alumina pre-melted slag as raw material, by adjust its with bauxite with addition of ratio and phase
Closing dissolution parameter (temperature, time etc.), in raising aluminum oxide production process, the aluminum oxide of bauxite is relative to dissolution rate.
Use high alumina pre-melted slag to replace lime production aluminum oxide, not only can play the effect of lime, simultaneously can be by high alumina pre-melted slag
In alumina leaching, its production cost can be effectively reduced.Meanwhile, the leaching temperature of high alumina pre-melted slag is 200～280 DEG C,
Dissolution time is between 1-3 hour, and in its bauxite, the relative dissolution rate of aluminum oxide is up to more than 95%.
Production method of the present invention no longer produces new tailings, it is possible to achieve high alumina pre-melted slag comprehensive resource and harmless treatment, symbol
Close the industrial policy of country's recycling economy.
Detailed description of the invention
Illustrate below by way of specific description of embodiments of the present invention but be not intended to the present invention.
The method utilizing high alumina pre-melted slag production aluminum oxide of present invention offer, comprises the steps:
A, dispensing: high alumina pre-melted slag 15～20%, bauxite 80-85%；
B, employing alumina producing Bayer process.
Described high alumina pre-melted slag dominant is based on calcium aluminate and magnesium aluminate spinel.
Wherein, described high alumina pre-melted slag main component percentage by weight is Al2O350～60%, CaO 15～25%, SiO21～
3%, MgO3～8%, TiO2Content is less than 2%, and remaining is inevitable impurity.The leaching temperature of high alumina pre-melted slag 200～
280 DEG C, dissolution time is 30～90 minutes.
Wherein, step B uses alumina producing Bayer process method as follows:
1) mixing bauxite and high alumina pre-melted slag, is subsequently adding the preferred 200g/L of 150-250g/L() sodium carbonate liquor and
Molten 1-3 hour of alkali (preferably 2 hours) under the conditions of 200-280 DEG C (preferably 220 DEG C), filters, obtains sodium aluminate solution；
2) sodium aluminate solution reduction temperature is to 50-75 DEG C, adds aluminium hydroxide and makees crystal seed, stirs (preferably mixing time at least 12
Hour) decompose precipitation aluminium hydroxide to sodium aluminate, clean, and at 950～1200 DEG C of temperature lower calcinations, obtain aluminum oxide.
Below for production method of the present invention prepare example.
Embodiment 1:
Using high alumina pre-melted slag is that raw material replaces lime, its main component Al2O3Be 52.4%, CaO be 22.3%, MgO be
8.2%, SiO2Be 5.3%, TiO2It is 1.6%；Bauxite uses Henan bauxite, and its leading indicator is: Al2O3Content is
58.38%, A/S are 3.59；Being 16% at high alumina pre-melted slag with addition of ratio, Henan bauxite is 84% with addition of ratio, dissolution temperature
Spending 260 DEG C, dissolution time is 60 minutes, uses Bayer process process for making alumina, and in its bauxite, aluminum oxide is relative to dissolution rate
Being 95.78%, in high alumina pre-melted slag, aluminum oxide is 96.58% relative to dissolution rate.
Embodiment 2:
Using high alumina pre-melted slag is that raw material replaces lime, its main component Al2O3Be 52.4%, CaO be 22.3%, MgO be
8.2%, SiO2Be 5.3%, TiO2It is 1.6%；Bauxite uses Henan bauxite, and its leading indicator is: Al2O3Content is
58.38%, A/S are 3.59；Being 15% at high alumina pre-melted slag with addition of ratio, Henan bauxite is 85% with addition of ratio, in dissolution
Temperature 270 DEG C, dissolution time is 180 minutes, uses Bayer process process for making alumina, and in its bauxite, aluminum oxide is the most molten
Going out rate is 96.23%, and in high alumina pre-melted slag, aluminum oxide is 97.11% relative to dissolution rate.
Embodiment 3:
Using high alumina pre-melted slag is that raw material replaces lime, its main component Al2O3Be 52.4%, CaO be 22.3%, MgO be
8.2%, SiO2Be 5.3%, TiO2It is 1.6%；Bauxite uses Henan bauxite, and its leading indicator is: Al2O3Content is
58.38%, A/S are 3.59；Being 16% at high alumina pre-melted slag with addition of ratio, Henan bauxite is 84% with addition of ratio, in dissolution
Temperature 260 DEG C, dissolution time is 90 minutes, uses Bayer process process for making alumina, and in its bauxite, aluminum oxide is relative to dissolution
Rate is 95.68%, and in high alumina pre-melted slag, aluminum oxide is 96.18% relative to dissolution rate.
Comparative example 1
With lime, bauxite is raw material, and lime main component CaO is 85%；Bauxite uses Henan bauxite, and it refers mainly to
It is designated as: Al2O3Content is 58.38%, and A/S is 3.59；Being 16% at lime with addition of ratio, Henan bauxite with addition of ratio is
84%, leaching temperature 260 DEG C, dissolution time is 60 minutes, uses Bayer process process for making alumina, oxygen in its bauxite
Changing aluminium is 93.35% relative to dissolution rate.
Comparative example 2
With lime, bauxite is raw material, and it is 85% that lime is mainly composed of CaO；Bauxite uses Henan bauxite, and it is main
Index is: Al2O3Content is 58.38%, and A/S is 3.59；Being 15% at lime with addition of ratio, Henan bauxite is with addition of ratio
Being 85%, leaching temperature 270 DEG C, dissolution time is 180 minutes, uses Bayer process process for making alumina, its bauxite
Middle aluminum oxide is 95.28% relative to dissolution rate.
The embodiment of the present invention is shown in Table 1 with the processing parameter contrast of comparative example.
Table 1
To sum up, the present invention can effectively utilize high alumina pre-melted slag, reduces the production cost of commercial alumina, wherein bauxite simultaneously
In aluminum oxide relative to dissolution rate up to more than 95%, the present invention effectively make use of discarded secondary resource high alumina pre-melted slag, it is achieved
The zero-emission of this waste residue, has a preferable industrialization prospect simultaneously.
Claims (5)
1. utilize the method that high alumina pre-melted slag produces aluminum oxide, it is characterised in that: comprise the steps:
A, dispensing: high alumina pre-melted slag 15～20%, bauxite 80-85%；
Described high alumina pre-melted slag main component percentage by weight is Al2O350～60%, CaO 15～25%, SiO21～3%,
MgO 3～8%, TiO2Content is less than 2%；Dominant is based on calcium aluminate and magnesium aluminate spinel；
B, employing alumina producing Bayer process, method is as follows:
1) mixing bauxite and high alumina pre-melted slag, be subsequently adding 150-250g/L sodium carbonate liquor and under the conditions of 200-280 DEG C alkali
Molten 1-3 hour, filter, obtain sodium aluminate solution；
2) sodium aluminate solution reduction temperature is to 50-75 DEG C, adds aluminium hydroxide and makees crystal seed, stirs to sodium aluminate decomposition precipitation hydrogen-oxygen
Change aluminium, clean, and at 950～1200 DEG C of temperature lower calcinations, obtain aluminum oxide.
The method utilizing high alumina pre-melted slag to produce aluminum oxide the most according to claim 1, it is characterised in that: described high alumina is pre-
The leaching temperature of slag is at 200～280 DEG C, and dissolution time is 1-3 hour.
The method utilizing high alumina pre-melted slag to produce aluminum oxide the most according to claim 1, it is characterised in that: described sodium carbonate
Solution is 200g/L.
The method utilizing high alumina pre-melted slag to produce aluminum oxide the most according to claim 1, it is characterised in that: step 1)
Molten 2 hours of alkali under the conditions of 220 DEG C.
The method utilizing high alumina pre-melted slag to produce aluminum oxide the most according to claim 1, it is characterised in that: step 2) institute
State mixing time at least 12 hours.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB782984A (en) * | 1954-08-31 | 1957-09-18 | Julius Dezso Madaras | Process for refining metals and apparatus for performing the same |
| US3782922A (en) * | 1967-06-26 | 1974-01-01 | Avery J Miles | Aluminothermic production of magnesium and an oxidic slag containing recoverable alumina |
| CN101113001A (en) * | 2007-07-12 | 2008-01-30 | 中国铝业股份有限公司 | Method for producing aluminium oxide by middle-low grade alumyte |
| CN102583477A (en) * | 2012-03-16 | 2012-07-18 | 东北大学 | Comprehensive utilization method of high-ferrum and low-grade bauxite |
| CN102586610A (en) * | 2012-03-19 | 2012-07-18 | 河北钢铁股份有限公司承德分公司 | Cleaner production process for synchronously extracting vanadium and aluminum from aluminothermic vanadium iron slag |
| CN102936024A (en) * | 2012-11-23 | 2013-02-20 | 攀枝花钢城集团有限公司 | Preparation method of metallurgical aluminum oxide |
-
2013
- 2013-12-12 CN CN201310682936.2A patent/CN103643050B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB782984A (en) * | 1954-08-31 | 1957-09-18 | Julius Dezso Madaras | Process for refining metals and apparatus for performing the same |
| US3782922A (en) * | 1967-06-26 | 1974-01-01 | Avery J Miles | Aluminothermic production of magnesium and an oxidic slag containing recoverable alumina |
| CN101113001A (en) * | 2007-07-12 | 2008-01-30 | 中国铝业股份有限公司 | Method for producing aluminium oxide by middle-low grade alumyte |
| CN102583477A (en) * | 2012-03-16 | 2012-07-18 | 东北大学 | Comprehensive utilization method of high-ferrum and low-grade bauxite |
| CN102586610A (en) * | 2012-03-19 | 2012-07-18 | 河北钢铁股份有限公司承德分公司 | Cleaner production process for synchronously extracting vanadium and aluminum from aluminothermic vanadium iron slag |
| CN102936024A (en) * | 2012-11-23 | 2013-02-20 | 攀枝花钢城集团有限公司 | Preparation method of metallurgical aluminum oxide |
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