CN102730729A - Calcium aluminate slag containing sodium oxide and titanium oxide - Google Patents
Calcium aluminate slag containing sodium oxide and titanium oxide Download PDFInfo
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- CN102730729A CN102730729A CN2012102279015A CN201210227901A CN102730729A CN 102730729 A CN102730729 A CN 102730729A CN 2012102279015 A CN2012102279015 A CN 2012102279015A CN 201210227901 A CN201210227901 A CN 201210227901A CN 102730729 A CN102730729 A CN 102730729A
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- cao
- slag
- sio
- calcium aluminate
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Abstract
The invention relates to a calcium aluminate slag containing sodium oxide and titanium oxide which has a high alumina leaching rate. The slag comprises the following proportioning materials, by mass, 1.5% to 4% of Na2O, 23.5% to 6% of TiO, 54 to 57% of CaO, 17 to 21% of SiO2, 16 to 20% of Al2O3 and the total of 100%. The mass ratio of Al2O3 to SiO2 in the materials is 0.8 to 1.0. The total amount of CaO meets the following three requirements: the first requirement that CaO reacts with SiO2 to produce 2CaO. SiO2 is met; the second requirement of needed CaO amount to produce 12CaO. 7Al2O3 by reacting with Al2O3 is met; and the third requirement of needed CaO amount to have a molar ratio of 0.5 to 1.25 with TiO2 on the basis of the Na2O and TiO2 content in the slag is met. The alumina leaching rate of the slag increases to more than 83% compared with the initial 78%.
Description
Technical field
The present invention relates to a kind of calcium aluminate slag that is used to extract aluminum oxide, specifically is the high calcium aluminate slag that contains sodium oxide, titanium oxide of a kind of leaching rate of alumina.
Background technology
Lime sinter process is one of industrial production method of alumina, obtains calcium aluminate slag through the lime sintering aluminiferous material, and calcium aluminate slag is the raw material that extracts aluminum oxide.The main thing of calcium aluminate slag is 12CaO ﹒ 7Al mutually
2O
3, 2CaO ﹒ SiO
2, 12CaO ﹒ 7Al in the calcium aluminate slag
2O
3Leach the extraction aluminum oxide through sodium carbonate solution.Therefore, in the traditional lime sintering process proportioning materials process with addition of the amount of CaO except satisfying and SiO
2Reaction generates 2CaO ﹒ SiO
2Requirement outside, also to satisfy and Al
2O
3Reaction generates 12CaO ﹒ 7Al
2O
3Need calcium amount, promptly with addition of total CaO amount remove and SiO
2Behind the CaO that consumes, remaining CaO and Al
2O
3Material molar weight ratio be 1.71 comparatively suitable.
Main oxides in Pingguo, the Guangxi aluminium manufacturer red mud is red stone and aluminum oxide, and the large percentage that both account for reaches about 50%.Adopt the melting of COREX technology melting and reducing to handle red mud; Red stone is reduced the formation molten iron in the retailoring process; Oxide compounds such as the aluminum oxide that is not reduced in the red mud form slag, through with addition of flux such as CaO adjustment slag composition proportioning, finally obtain the calcium aluminate slag in the slag forming process; This calcium aluminate slag leaches through sodium carbonate solution and reclaims aluminum oxide, and then realizes the comprehensive utilization of red mud.This calcium aluminate slag staple is CaO, SiO
2And Al
2O
3, different with traditional calcium aluminate slag is that this slag also contains a certain amount of TiO
2, Na
2O.When adopting traditional CaO and Al
2O
3Proportioning is that CaO amount total in the slag deducts and SiO
2In conjunction with generating 2CaO ﹒ SiO
2Behind the CaO that consumes, remaining CaO and Al
2O
3Material molar weight ratio be 1.71 to adjust slag composition, retailoring obtains calcium aluminate slag.Because TiO in the slag
2, Na
2When the influence of O, this calcium aluminate slag were leached the recovery aluminum oxide through sodium carbonate solution, the highest being merely about 78% of slag oxidation aluminium leaching yield can't be satisfied the aluminum oxide industry production requirement.Therefore, how to obtain the suitable calcium aluminate slag that extracts aluminum oxide, thereby reach the purpose of comprehensive utilization red mud, have great importance through adjustment slag composition proportioning.
Summary of the invention
The objective of the invention is for solve as the calcium aluminate slag that extracts alumina raw material owing to contain a certain amount of sodium oxide, titanium oxide causes the low problem of slag oxidation aluminium leaching yield, and then provides a kind of leaching rate of alumina the high calcium aluminate slag that contains sodium oxide, titanium oxide.
Technical scheme of the present invention: a kind of calcium aluminate slag that contains sodium oxide, titanium oxide comprises that following material component carries out proportioning, wherein Na by mass percentage
2O1.5% ~ 4%, TiO
23.5% ~ 6%, CaO54 ~ 57%, SiO
217 ~ 21%, Al
2O
316 ~ 20%, amount to 100%; Al in the proportioned material
2O
3With SiO
2Mass ratio be 0.8 ~ 1.0; With addition of the CaO total amount satisfy below three aspect requirements, at first satisfied and SiO
2Reaction generates 2CaO ﹒ SiO
2Requirement, secondly also to satisfy and Al
2O
3Reaction generates 12CaO ﹒ 7Al
2O
3The CaO amount that needs is simultaneously according to Na in the slag charge
2O, TiO
2Content, also to satisfy and TiO
2The material molar weight is than the CaO amount that is 0.5～1.25;
The material for preparing melting under 1550 ℃ of temperature, 1 hour time, the speed of cooling by 4～5 ℃/min is cooled to 1200 ℃ then, naturally cools to room temperature again, promptly gets calcium aluminate slag.
In aluminum oxide production process, leaching rate of alumina is a very important technical indicator, and leaching rate of alumina improves very difficulty, and every raising 1% all will bring considerable income concerning enterprise.The present invention went through for 2 years; Analyze the various influence factors that slag forms in the smelting reduction process; Progressively grope the slag material proportion and carried out up to a hundred experiments; Finally confirm the slag material proportion scope that satisfies the aluminum oxide industry manufacturing technique requirent fully of the present invention, thereby reached the purpose of comprehensive utilization red mud.
Advantage of the present invention is on traditional batching basis, through to TiO in the material
2With addition of CaO, efficiently solve owing to contain a certain amount of sodium oxide, titanium oxide causes the low problem of calcium aluminate slag leaching rate of alumina.Slag oxidation aluminium leaching yield is brought up to more than 83% by original the highest 78%, satisfied the aluminum oxide industry manufacturing technique requirent fully, leaching rate of alumina has improved more than 5%, has increased aluminum oxide output greatly, and remarkable in economical benefits improves.
Embodiment
Embodiment 1: slag composition carries out proportioning by mass percentage, wherein, and Na
2O1.96%, TiO
23.93%, CaO56.60%, SiO
220.64%, Al
2O
316.87%, amount to 100%.Al in the proportioned material
2O
3With SiO
2Mass ratio be 0.8; With addition of the CaO total amount satisfy three aspect requirements, at first satisfy and SiO
2Reaction generates 2CaO ﹒ SiO
2Requirement, secondly also to satisfy and Al
2O
3Reaction generates 12CaO ﹒ 7Al
2O
3The CaO amount that needs also will satisfy TiO simultaneously
2The calcium amount of joining, to TiO
2The CaO mass percent of being joined is 2.24%, with this part CaO and TiO
2Mass ratio to be converted into material molar weight ratio be 0.8.
Above-mentioned material in processing condition is: melting under 1550 ℃ of temperature, 1 hour time, the speed of cooling by 4～5 ℃/min is cooled to 1200 ℃ then, naturally cools to room temperature again, promptly gets calcium aluminate slag.
The aluminum oxide leaching condition is: Na in the sodium carbonate solution
2O
CThe mass concentration of (carbon alkali) is that volume and the mass ratio of 110g/L, sodium carbonate solution and slag is 4.5,75 ℃ of extraction temperatures, extraction time 100 minutes, Al
2O
3Leaching yield is 83.5%, satisfies the aluminum oxide industry manufacturing technique requirent fully.
Embodiment 2: slag composition carries out proportioning by mass percentage, wherein, and Na
2O1.87%, TiO
25.61%, CaO56.76%, SiO
219.67%, Al
2O
316.08%, amount to 100%.Al in the proportioned material
2O
3With SiO
2Mass ratio be 0.8; With addition of the CaO total amount satisfy three aspect requirements, at first satisfy and SiO
2Reaction generates 2CaO ﹒ SiO
2Requirement, secondly also to satisfy and Al
2O
3Reaction generates 12CaO ﹒ 7Al
2O
3The CaO amount that needs also will satisfy TiO simultaneously
2The calcium amount of joining, to TiO
2The CaO mass percent of being joined is 5.25%, with this part CaO and TiO
2Mass ratio to be converted into material molar weight ratio be 1.25.
Above-mentioned material carries out melting, cooling by embodiment 1 identical processing condition, gets calcium aluminate slag.
The aluminum oxide leaching condition is identical with embodiment 1, Al
2O
3Leaching yield is 84.1%.Satisfy the aluminum oxide industry manufacturing technique requirent fully.
Embodiment 3: slag composition carries out proportioning, Na by mass percentage
2O3.82%, TiO
23.82%, CaO54.50%, SiO
218.94%, Al
2O
318.94%, amount to 100%.Al in the proportioned material
2O
3With SiO
2The material mass ratio be 1.0; With addition of the CaO total amount satisfy three aspect requirements, at first satisfy and SiO
2Reaction generates 2CaO ﹒ SiO
2Requirement, secondly also to satisfy and Al
2O
3Reaction generates 12CaO ﹒ 7Al
2O
3The CaO amount that needs also will satisfy TiO simultaneously
2The calcium amount of joining, to TiO
2The CaO mass percent of being joined is 1.4%, with this part CaO and TiO
2Mass ratio to be converted into material molar weight ratio be 0.5.
Above-mentioned material carries out melting, cooling by embodiment 1 identical processing condition, gets calcium aluminate slag.
The aluminum oxide leaching condition is identical with embodiment 1, Al
2O
3Leaching yield is 84.8%.Satisfy the aluminum oxide industry manufacturing technique requirent fully.
Embodiment 4: slag composition carries out proportioning, Na by mass percentage
2O3.61%, TiO
25.42%, CaO55.10%, SiO
217.93%, Al
2O
317.93%, amount to 100%.Al in the proportioned material
2O
3With SiO
2The material mass ratio be 1.0; With addition of the CaO total amount satisfy three aspect requirements, at first satisfy and SiO
2Reaction generates 2CaO ﹒ SiO
2Requirement, secondly also to satisfy and Al
2O
3Reaction generates 12CaO ﹒ 7Al
2O
3The CaO amount that needs also will satisfy TiO simultaneously
2The calcium amount of joining, to TiO
2The CaO mass percent of being joined is 5.25%, with this part CaO and TiO
2Mass ratio to be converted into material molar weight ratio be 1.25.
Above-mentioned material carries out melting, cooling by embodiment 1 identical processing condition, gets calcium aluminate slag.
The aluminum oxide leaching condition is identical with embodiment 1, Al
2O
3Leaching yield is 84.3%.Satisfy the aluminum oxide industry manufacturing technique requirent fully.
Claims (2)
1. a calcium aluminate slag that contains sodium oxide, titanium oxide is characterized in that: comprise that following material component carries out proportioning, wherein Na by mass percentage
2O1.5% ~ 4%, TiO
23.5% ~ 6%, CaO54 ~ 57%, SiO
217 ~ 21%, Al
2O
316 ~ 20%, amount to 100%; Al in the proportioned material
2O
3With SiO
2Mass ratio be 0.8 ~ 1.0; With addition of the CaO total amount satisfy below three aspect requirements, at first satisfied and SiO
2Reaction generates 2CaO ﹒ SiO
2Requirement, secondly also to satisfy and Al
2O
3Reaction generates 12CaO ﹒ 7Al
2O
3The CaO amount that needs is simultaneously according to Na in the slag charge
2O, TiO
2Content, also to satisfy and TiO
2The material molar weight is than the CaO amount that is 0.5～1.25.
2. a kind of calcium aluminate slag that contains sodium oxide, titanium oxide according to claim 1; It is characterized in that: the material for preparing melting under 1550 ℃ of temperature, 1 hour time, the speed of cooling by 4～5 ℃/min is cooled to 1200 ℃ then; Naturally cool to room temperature again, promptly get calcium aluminate slag.
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|---|---|---|---|
| CN 201210227901 CN102730729B (en) | 2012-07-04 | 2012-07-04 | Calcium aluminate slag containing sodium oxide and titanium oxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210227901 CN102730729B (en) | 2012-07-04 | 2012-07-04 | Calcium aluminate slag containing sodium oxide and titanium oxide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102730729A true CN102730729A (en) | 2012-10-17 |
| CN102730729B CN102730729B (en) | 2013-10-23 |
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|---|---|---|---|
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB457676A (en) * | 1934-08-30 | 1936-12-03 | Alcan Aluminium Ltd | A process for the production of a calcium aluminate suitable for the manufacture of sodium aluminate by treatment with soda lye |
| US4162923A (en) * | 1977-12-12 | 1979-07-31 | Lafarge Fondu International | Calcium aluminate based refractory hydraulic binder and its process of preparation |
| CN1554778A (en) * | 2003-12-26 | 2004-12-15 | 张延大 | Low-titanium calcium aluminate and its preparing method |
| CN101244835A (en) * | 2008-03-25 | 2008-08-20 | 上海彭浦冶金辅料有限公司 | Preliminary melting type calcium aluminate for ultra-clean steel and method of manufacturing the same |
| CN101550471A (en) * | 2009-05-14 | 2009-10-07 | 张延大 | Method utilizing nonferrous metal production waste to prepare calcium aluminate used for metallurgy |
| JP4527656B2 (en) * | 2005-11-28 | 2010-08-18 | 電気化学工業株式会社 | Calcium aluminate, alumina cement and amorphous refractories |
-
2012
- 2012-07-04 CN CN 201210227901 patent/CN102730729B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB457676A (en) * | 1934-08-30 | 1936-12-03 | Alcan Aluminium Ltd | A process for the production of a calcium aluminate suitable for the manufacture of sodium aluminate by treatment with soda lye |
| US4162923A (en) * | 1977-12-12 | 1979-07-31 | Lafarge Fondu International | Calcium aluminate based refractory hydraulic binder and its process of preparation |
| CN1554778A (en) * | 2003-12-26 | 2004-12-15 | 张延大 | Low-titanium calcium aluminate and its preparing method |
| JP4527656B2 (en) * | 2005-11-28 | 2010-08-18 | 電気化学工業株式会社 | Calcium aluminate, alumina cement and amorphous refractories |
| CN101244835A (en) * | 2008-03-25 | 2008-08-20 | 上海彭浦冶金辅料有限公司 | Preliminary melting type calcium aluminate for ultra-clean steel and method of manufacturing the same |
| CN101550471A (en) * | 2009-05-14 | 2009-10-07 | 张延大 | Method utilizing nonferrous metal production waste to prepare calcium aluminate used for metallurgy |
Non-Patent Citations (2)
| Title |
|---|
| 佟志芳等: "冷却制度及物料配比对铝酸钙炉渣物化性能的影响", 《有色金属科学与工程》 * |
| 王波等: "烧结工艺参数对铝酸钙炉渣体系物化性能的影响", 《过程工程学报》 * |
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|---|---|
| CN102730729B (en) | 2013-10-23 |
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Granted publication date: 20131023 Termination date: 20160704 |