CN114735739A - Method for preparing light calcium carbonate by using sintering method carbon content mother liquor - Google Patents
Method for preparing light calcium carbonate by using sintering method carbon content mother liquor Download PDFInfo
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- CN114735739A CN114735739A CN202210287766.7A CN202210287766A CN114735739A CN 114735739 A CN114735739 A CN 114735739A CN 202210287766 A CN202210287766 A CN 202210287766A CN 114735739 A CN114735739 A CN 114735739A
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- China
- Prior art keywords
- mother liquor
- calcium carbonate
- light calcium
- preparing light
- sintering
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000012452 mother liquor Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 50
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 title claims abstract description 48
- 238000005245 sintering Methods 0.000 title claims abstract description 31
- 229910000019 calcium carbonate Inorganic materials 0.000 title claims abstract description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims description 17
- 229910052799 carbon Inorganic materials 0.000 title claims description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 26
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 23
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 23
- 239000004571 lime Substances 0.000 claims abstract description 23
- 239000008267 milk Substances 0.000 claims abstract description 23
- 210000004080 milk Anatomy 0.000 claims abstract description 23
- 235000013336 milk Nutrition 0.000 claims abstract description 23
- 238000001914 filtration Methods 0.000 claims abstract description 15
- 238000004131 Bayer process Methods 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 9
- 238000000354 decomposition reaction Methods 0.000 claims description 12
- 238000012216 screening Methods 0.000 claims description 9
- 239000002002 slurry Substances 0.000 claims description 9
- 238000001556 precipitation Methods 0.000 claims description 7
- 239000000047 product Substances 0.000 claims description 6
- 230000035484 reaction time Effects 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000003763 carbonization Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 239000011575 calcium Substances 0.000 claims description 4
- 239000000706 filtrate Substances 0.000 claims description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 3
- 239000000920 calcium hydroxide Substances 0.000 claims description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 3
- 239000004615 ingredient Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 238000004090 dissolution Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 abstract description 13
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 9
- 238000005406 washing Methods 0.000 abstract description 6
- 239000012535 impurity Substances 0.000 abstract description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 6
- 239000011734 sodium Substances 0.000 description 6
- 239000006227 byproduct Substances 0.000 description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
-
- 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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a method for preparing light calcium carbonate by using a carbonation mother liquor of a sintering method, which comprises the steps of carrying out deep carbonation treatment on the carbonation mother liquor of an alumina sintering method to obtain the carbonation mother liquor with low impurity content, carrying out causticization reaction by using lime milk after addition and classification treatment, returning the causticized liquor to a Bayer process for proportioning, filtering, washing and drying the generated solid to prepare a light calcium carbonate product.
Description
Technical Field
The invention belongs to the technical field of alumina production, and particularly relates to a method for preparing light calcium carbonate by using a sintering-process carbonization mother liquor.
Background
In the production flow of aluminum oxide by a sintering method, a large amount of mother liquor is generated by preparing an aluminum hydroxide product by carbon separation, the main components in the mother liquor are sodium carbonate and part of unreacted sodium metaaluminate, the mother liquor is generally recovered by evaporating and concentrating the mother liquor, then batching and sintering are carried out to recover the sodium carbonate, but the method needs to evaporate and remove a large amount of water, has large energy consumption, and the recovered sodium carbonate contains impurity aluminum oxide, so that part of the aluminum oxide returns to the front end of the flow to carry out repeated reaction, and the cost is increased. Another method for recovering mother liquor of sintering process is to add lime milk to causticize the mother liquor, then make the causticized liquor enter Bayer process batching, wherein the carbon alkali can be partially recovered, but the solid component generated by causticization is complex, and still need to return to sintering process batching, and increase the energy consumption of sintering process as well.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for preparing light calcium carbonate by using a sintering method carbon content mother liquor, which specifically comprises the following steps:
a method for preparing light calcium carbonate by using a sintering method carbon content mother liquor comprises the following steps:
(1) introducing sufficient CO into the carbon precipitation mother liquor of the sintering method2After the reaction is finished, filtering the reaction system to obtain mother liquor subjected to deep carbonation decomposition;
(2) screening the lime milk to ensure that the 60-mesh screening rate of the screened lime milk is higher than 95 percent;
(3) mixing the mother liquor obtained in the step (1) and the lime milk sieved in the step (2) according to [ Ca ]2+]And [ CO ]3 2-]The molar ratio of the raw materials is 0.5 to 0.8, carrying out causticization reaction, and controlling the reaction temperature to be 30 to 50 ℃;
(4) and filtering the slurry after the causticization reaction, and drying the obtained filter residue to obtain the light calcium carbonate product.
Specifically, Na in the carbon content mother liquor of the sintering method in the step (1)2OCThe content of (b) is 120-160 g/L.
Specifically, the content of alumina in the mother liquor of the deep carbonation decomposition in the step (1) is less than 0.5 g/L.
Specifically, the step (1) further comprises the step of detecting the concentration of carbonate ions in the mother liquor subjected to deep carbonation decomposition.
Specifically, the content of the calcium hydroxide in the lime milk in the step (2) is 200-250 g/L.
Specifically, the reaction time in the step (3) is 1-3 h.
Specifically, the stirring speed of the reaction in the step (3) is controlled to be 50-100 r/min.
Specifically, the filtrate filtered in the step (4) is evaporated and then returned to a Bayer process to be used as a dissolution ingredient.
The invention has the beneficial effects that: the method utilizes the carbonation mother liquor of the alumina sintering method to obtain the carbonation mother liquor with low impurity content through deep carbonation treatment, utilizes the lime milk added with the graded treatment to carry out causticization reaction, returns the causticized liquor to the Bayer process flow for batching, and prepares the light calcium carbonate product after filtering, washing and drying the generated solid.
Detailed Description
The present invention will be described in detail with reference to the following embodiments. The embodiments shown below do not limit the inventive content described in the claims. The entire contents of the configurations shown in the following embodiments are not limited to those required as solutions of the inventions described in the claims.
A method for preparing light calcium carbonate by using a sintering method carbon content mother liquor comprises the following steps:
(1) introducing sufficient CO into the carbon precipitation mother liquor of the sintering method2After the reaction is finished, filtering the reaction system to obtain mother liquor subjected to deep carbonation decomposition;
(2) screening the lime milk to ensure that the 60-mesh screening rate of the screened lime milk is higher than 95 percent;
(3) mixing the mother liquor obtained in the step (1) and the lime milk sieved in the step (2) according to [ Ca ]2+]And [ CO ]3 2-]The molar ratio of the raw materials is 0.5 to 0.8, and the mixture is subjected to causticization reaction, and the reaction temperature is controlled to be 30 to 50 ℃;
(4) and filtering the slurry after the causticization reaction, and drying the obtained filter residue to obtain the light calcium carbonate product.
Step (1) adding Na in the sintering method carbon precipitation mother liquor2OCThe content of (b) can be 120g/L, 130g/L, 140g/L, 150g/L, 160 g/L; the content of alumina in the mother liquor of deep carbonation decomposition is less than 0.5g/L, specifically 0.1g/L, 0.2g/L, 0.3g/L, 0.4g/L and the like; the step (1) also comprises the step of detecting the concentration of carbonate ions in the mother liquor subjected to deep carbonation decomposition.
The content of the calcium hydroxide in the lime milk in the step (2) can be 200g/L, 210g/L, 220g/L, 230g/L, 240g/L and 250 g/L; the content of the lime milk on a 60-mesh sieve can be 1%, 2%, 3%, 4%, 4.5% and the like.
In step (3) [ Ca2+]And [ CO ]3 2-]The molar ratio of (A) to (B) can be 0.5, 0.6, 0.7, 0.8, and the reaction temperature can be 30 ℃, 40 ℃, 45 ℃, 50 ℃; the reaction time may be1h, 2h, 2.5h and 3 h; the stirring speed of the reaction can be 50r/min, 60r/min, 70r/min, 80r/min, 90r/min and 100 r/min.
And (4) evaporating the filtrate filtered in the step (4) and returning the filtrate to a Bayer process to be used as a dissolving ingredient.
Example 1
Separating carbon from mother liquor Na by sintering process2OC120g/l, introducing CO2Deep carbonation decomposition is carried out to lead the content of alumina in the solution to be 0.3g/l, and the deep carbonation mother liquor is prepared by filtration.
And (3) screening lime milk with solid content of 220g/l to ensure that the content of more than 60 meshes in the solid in the slurry reaches 3%.
Controlling the temperature of the deep carbonation mother liquor to 35 ℃ according to the following formula [ Ca2+]/[CO3 2-]Slowly adding the mixture into lime milk at a molar ratio of 0.5, controlling the stirring speed to be 55r/min, and controlling the reaction time to be 1.5h.
And filtering the slurry after reaction, and washing and drying the solid to prepare a light calcium carbonate byproduct. The separated mother liquor is evaporated and then returns to a Bayer process system for batching.
Example 2
Separating carbon from mother liquor Na by sintering process2OC150g/l, introduction of CO2Carrying out deep carbonation decomposition to ensure that the content of alumina in the solution is 0.5g/l, and filtering to prepare deep carbonation mother liquor.
And (3) screening the lime milk with the solid content of 250g/l to ensure that the content of more than 60 meshes in the solid in the slurry reaches 5 percent.
Controlling the temperature of the deep carbonation mother liquor to be 50 ℃ according to the following [ Ca ]2+]/[CO3 2-]Slowly adding the mixture into the lime milk at a molar ratio of 0.8, and controlling the stirring speed to be 100r/min and the reaction time to be 3h.
And filtering the slurry after reaction, and washing and drying the solid to prepare a light calcium carbonate byproduct. The separated mother liquor is evaporated and then returns to a Bayer process system for batching.
Example 3
Separating carbon from mother liquor Na by sintering process2OC130g/l, introduction of CO2Deep carbonation decomposition is carried out to lead the content of alumina in the solution to be 0.4g/l, and the deep carbonation mother liquor is prepared by filtration.
And (3) screening the lime milk with the solid content of 230g/l to ensure that the content of more than 60 meshes in the solid in the slurry reaches 4 percent.
Controlling the temperature of the deep carbonation mother liquor to be 40 ℃ according to the following formula [ Ca2+]/[CO3 2-]Slowly adding the mixture into lime milk at a molar ratio of 0.6, and controlling the stirring speed to be 80r/min and the reaction time to be 2h.
And filtering the slurry after reaction, and washing and drying the solid to prepare a light calcium carbonate byproduct. The separated mother liquor is evaporated and then returns to a Bayer process system for batching.
The method utilizes the carbonation mother liquor of the alumina sintering method to obtain the carbonation mother liquor with low impurity content through deep carbonation treatment, utilizes the lime milk added with the graded treatment to carry out causticization reaction, returns the causticized liquor to the Bayer process flow for batching, and prepares the light calcium carbonate product after filtering, washing and drying the generated solid.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A method for preparing light calcium carbonate by using a sintering method carbon content mother liquor is characterized by comprising the following steps:
(1) introducing sufficient CO into the carbon precipitation mother liquor of the sintering method2After the reaction is finished, filtering the reaction system to obtain mother liquor subjected to deep carbonation decomposition;
(2) screening the lime milk to ensure that the 60-mesh screening rate of the screened lime milk is higher than 95 percent;
(3) mixing the mother liquor obtained in the step (1) and the lime milk sieved in the step (2) according to [ Ca ]2+]And [ CO ]3 2-]The molar ratio of the raw materials is 0.5 to 0.8, and the mixture is subjected to causticization reaction, and the reaction temperature is controlled to be 30 to 50 ℃;
(4) and filtering the slurry after the causticization reaction, and drying the obtained filter residue to obtain the light calcium carbonate product.
2. The method for preparing light calcium carbonate by using the carbonization precipitation mother liquor of the sintering process, which is characterized in that, according to the step (1), Na in the carbonization precipitation mother liquor of the sintering process2OCThe content of (b) is 120-160 g/L.
3. The method for preparing light calcium carbonate by using the carbon content mother liquor of the sintering method according to claim 1, wherein Al in the mother liquor of the deep carbonation decomposition in the step (1)2O3The content of (B) is less than 0.5 g/L.
4. The method for preparing light calcium carbonate by using the carbonization mother liquor of the sintering method according to claim 1, wherein the step (1) further comprises detecting the concentration of carbonate ions in the mother liquor after deep carbonation decomposition.
5. The method for preparing light calcium carbonate by using the carbonation mother liquor of the sintering method as claimed in claim 1, wherein the content of calcium hydroxide in the lime milk in the step (2) is 200-250 g/L.
6. The method for preparing light calcium carbonate by using the carbonization precipitation mother liquor in the sintering process according to claim 1, wherein the reaction time in the step (3) is 1-3 h.
7. The method for preparing light calcium carbonate by using the carbonation mother liquor of the sintering process, which is characterized in that the stirring speed of the reaction in the step (3) is controlled to be 50-100 r/min.
8. The method for preparing light calcium carbonate by using the carbonation mother liquor of the sintering process, which is characterized in that the filtrate filtered in the step (4) is evaporated and then returned to the Bayer process as a dissolution ingredient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210287766.7A CN114735739A (en) | 2022-03-22 | 2022-03-22 | Method for preparing light calcium carbonate by using sintering method carbon content mother liquor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210287766.7A CN114735739A (en) | 2022-03-22 | 2022-03-22 | Method for preparing light calcium carbonate by using sintering method carbon content mother liquor |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1405088A (en) * | 2002-11-12 | 2003-03-26 | 中国铝业股份有限公司 | Alkali-compensating method in process of aluminium oxide |
| CN1594092A (en) * | 2004-06-25 | 2005-03-16 | 中国铝业股份有限公司 | Process for recovering aluminum hydroxide from carbon liquor by sintering method |
| CN101186324A (en) * | 2007-12-17 | 2008-05-28 | 中国铝业股份有限公司 | Deep decomposition method for sodium aluminate solution |
| CN107298452A (en) * | 2017-06-23 | 2017-10-27 | 东北大学 | The method that the hot method of the step alkali of andradite one handles Bayer process red mud production metallurgy grade aluminum oxide |
-
2022
- 2022-03-22 CN CN202210287766.7A patent/CN114735739A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1405088A (en) * | 2002-11-12 | 2003-03-26 | 中国铝业股份有限公司 | Alkali-compensating method in process of aluminium oxide |
| CN1594092A (en) * | 2004-06-25 | 2005-03-16 | 中国铝业股份有限公司 | Process for recovering aluminum hydroxide from carbon liquor by sintering method |
| CN101186324A (en) * | 2007-12-17 | 2008-05-28 | 中国铝业股份有限公司 | Deep decomposition method for sodium aluminate solution |
| CN107298452A (en) * | 2017-06-23 | 2017-10-27 | 东北大学 | The method that the hot method of the step alkali of andradite one handles Bayer process red mud production metallurgy grade aluminum oxide |
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Application publication date: 20220712 |