CN111892073A - Method for removing organic matters in seed precipitation mother liquor by Bayer process - Google Patents
Method for removing organic matters in seed precipitation mother liquor by Bayer process Download PDFInfo
- Publication number
- CN111892073A CN111892073A CN202010656029.0A CN202010656029A CN111892073A CN 111892073 A CN111892073 A CN 111892073A CN 202010656029 A CN202010656029 A CN 202010656029A CN 111892073 A CN111892073 A CN 111892073A
- Authority
- CN
- China
- Prior art keywords
- mother liquor
- carbon
- concentration
- bayer process
- 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.)
- Pending
Links
Images
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
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
-
- 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
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/46—Purification of aluminium oxide, aluminium hydroxide or aluminates
-
- 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
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/46—Purification of aluminium oxide, aluminium hydroxide or aluminates
- C01F7/47—Purification of aluminium oxide, aluminium hydroxide or aluminates of aluminates, e.g. removal of compounds of Si, Fe, Ga or of organic compounds from Bayer process liquors
- C01F7/473—Removal of organic compounds, e.g. sodium oxalate
-
- 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
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/46—Purification of aluminium oxide, aluminium hydroxide or aluminates
- C01F7/47—Purification of aluminium oxide, aluminium hydroxide or aluminates of aluminates, e.g. removal of compounds of Si, Fe, Ga or of organic compounds from Bayer process liquors
- C01F7/473—Removal of organic compounds, e.g. sodium oxalate
- C01F7/476—Removal of organic compounds, e.g. sodium oxalate by oxidation
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a method for removing organic matters in seed precipitation mother liquor by a Bayer process, which comprises the following steps: conveying the Bayer process seed precipitation mother liquor into a carbon precipitation tank, introducing carbon dioxide into the carbon precipitation tank, performing carbonation decomposition to obtain carbon precipitation slurry, performing solid-liquid separation on the obtained carbon precipitation slurry to obtain aluminum hydroxide and carbon precipitation mother liquor, evaporating and batching the carbon precipitation mother liquor, and then entering a clinker kiln for sintering. The invention effectively removes soluble organic matters harmful to the Bayer process flow through the conversion of the Bayer process and the sintering process materials. Meanwhile, valuable substances in the materials transferred by the Bayer process are all recycled with high efficiency and low consumption.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a method for removing organic matters in Bayer process seed precipitation mother liquor.
Background
In the production process of the low-temperature Bayer process, organic matters influence the normal and stable operation of the processOne of the key indexes is that research shows that when the content of organic matters in the Bayer process concentrate liquid is 2.57g/L, the decomposition rate of seed precipitation is reduced by 3.45 percent. The organic carbon concentration of the refined liquid of an alumina factory is increased by 12.1g/L from 8.2g/L in three years, the decomposition rate of the seed dressing of the alumina factory is reduced from 56% to 51%, and Na of alumina products is added2The O content is increased from 0.16% to 0.40%. In addition, the increase of the organic matter concentration of the system can cause the production technical problems of granularity refinement of alumina products, whiteness reduction of products, scab thickening of heat exchange equipment, concentrated scab thickening of seed precipitation tanks, easy shedding, sedimentation in the system, reduction of the operation efficiency of filtering processes and the like. Bayer process alumina factories are likely to face the problem of too high organic content, the content of organic carbon in the refined liquid of Germany AOS alumina factories is as high as 34g/L, and the content of organic carbon in the refined liquid of Japan Sumitomo alumina factories is 18g/L, which directly affects the production of alumina.
The organic substances in the Bayer process refined liquor mainly comprise formic acid, acetic acid, succinic acid, oxalic acid, humic acid, benzoic acid and the like. The composition of organic matters of alumina factories varies according to the ore source and the process. In the Bayer process concentrate liquid, only the concentration of oxalate can reach the saturation solubility, and crystallization is separated out.
At present, the method for removing organic matters by the Bayer process flow comprises the following steps: (1) concentration-increasing precipitation method: by utilizing the dissolution and precipitation rule of oxalate, the intermediate materials with higher sodium oxalate content, such as decomposition mother liquor, hydroaluminum washing liquor and the like in Bayer process circulation are enriched, and Na is increased2And the concentration of O ensures that oxalate in the solution is precipitated in a supersaturated state, the precipitated oxalate is discharged out of the Bayer process flow in a solid-liquid separation mode, and the filtrate returns to the Bayer process flow for continuous circulation. (2) Causticizing precipitation method: by utilizing the dissolving and separating rule of calcium oxalate, lime can be added into intermediate materials with higher oxalate content and lower alumina concentration, such as crystal seed washing liquor, aluminum hydroxide washing liquor and the like in Bayer process circulation, so that oxalate in the solution can be separated out in the form of calcium oxalate, and the separated calcium oxalate is discharged out of the Bayer process flow in a settling separation mode. However, the thickening precipitation method and the causticizing precipitation method only can remove oxalate in a Bayer process system and cannot remove the herbicidal acidOrganic substances other than salts that are always present in the liquid phase feed. (3) Ion exchange method: when the Bayer liquor passes through the ion exchange resin, organic molecules are exchanged on the resin, and the removal and separation can be realized. However, because of the high cost and difficulty of ion exchange resin regeneration, research on ion exchange methods is limited to the laboratory scale and has not been applied to the industrial practice of alumina production. (4) And (3) wet oxidation: under certain conditions, it is sometimes necessary to add an oxidizing agent (oxygen, ozone, manganese dioxide, etc.) at a specific node of the bayer process cycle, raise the reaction temperature or add a catalyst (copper oxide, tricobalt tetraoxide, nickel sesquioxide, etc.), and finally convert the organic carbon into an inorganic carbonate or carbon dioxide. However, the wet oxidation method causes problems such as accelerated corrosion of equipment, difficulty in recovering a catalyst, and contamination of products. Meanwhile, the problems of incomplete oxidation reaction of organic matters, increased oxalate content and the like exist. (5) Pyrogenic oxidation: under the condition of not higher than 1100 deg.C, the raw bauxite ore can be directly roasted, so that the organic substances brought in the bauxite ore can be completely removed, and the dissolution condition of the bauxite ore is not affected. However, the bauxite has long roasting time, large heat loss, huge energy consumption and high equipment and production cost.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for removing organic matters in Bayer process seed precipitation mother liquor, which solves the problem that soluble organic matters in a Bayer process system are difficult to remove at low cost by utilizing the characteristic of complementation of a Bayer process and a sintering process alumina process.
The invention is realized by the following technical scheme.
A method for removing organic matters in seed precipitation mother liquor of a Bayer process is characterized by comprising the following steps:
(1) carbonating and decomposing Bayer process seed precipitation mother liquor:
conveying the Bayer process seed precipitation mother liquor into a carbon precipitation tank, introducing carbon dioxide into the carbon precipitation tank, and performing carbonation decomposition to obtain carbon precipitation slurry;
the main reaction equation in the carbonation decomposition process is as follows:
2NaAlO2+3H2O+CO2→Na2CO3+2Al(OH)3
(2) and (3) carrying out solid-liquid separation on the carbon slurry:
carrying out solid-liquid separation on the carbon content slurry obtained in the step (1), wherein the obtained solid phase is an aluminum hydroxide material, and the obtained liquid phase is a carbon content mother liquor;
(3) and (3) carbon separation mother liquor proportioning and sintering:
and (3) carrying out evaporation and batching processes on the carbon content mother liquor obtained in the step (2), and then entering a clinker kiln for sintering.
The main reaction equation of the sintering process is as follows:
2Na(C)n+2nO2→Na2O+2nCO2((C)nrepresents an organic group such as oxalate, formate, acetate, succinate, benzoate, humate, etc.)
Further, the quality of the Bayer process seed precipitation mother liquor is 0.2-10% of the total seed precipitation mother liquor in the Bayer process alumina production process.
Further, the Bayer process seed precipitation mother liquor comprises an aqueous solution of sodium aluminate, sodium hydroxide, sodium carbonate and an organic acid sodium salt.
Further, the sodium aluminate concentration (typically characterized by the concentration of alumina in the liquid phase) is characterized by alumina (Al)2O3) The concentration meter is 69-113 g/L; the sodium hydroxide concentration (typically characterized using a caustic soda concentration) is in terms of caustic soda (Na)2O) concentration meter is 130-200 g/L; the sodium carbonate concentration (as Na)2O) is 5-20 g/L; the concentration of the organic acid sodium salt (calculated by TOC (total organic carbon)) is 4-20 g/L.
Further, the introduction amount of the carbon dioxide in the step (1) is determined according to the decomposition speed of the sodium aluminate in the liquid phase, namely, per m3The Bayer process seed precipitation mother liquor consumes 100m3-1000m3Carbon dioxide.
Further, the concentration of alumina in the carbon content slurry in the step (1) is 0-70g/L, and the carbonation decomposition rate is 38% -100%, so that the concentration of liquid phase alumina in the sintering method raw slurry is not more than 35g/L after the subsequent carbon content mother liquor participates in the batching. (decomposition by carbonation)Then, aluminum hydroxide (as Al) precipitated from the liquid phase2O3Calculated) as a percentage of alumina in the liquid phase of the seed mother liquor prior to carbonation decomposition, referred to as the decomposition rate).
Further, in the step (1), the Bayer process mother liquor and other materials in the production process of the aluminum oxide are mixed and then subjected to carbonation decomposition, the proportion of the other materials is 0-90% by mass, the other materials are sintering process seed precipitation mother liquor or aluminum hydroxide filtering washing liquor, the concentration of caustic sodium oxide in the sintering process seed precipitation mother liquor or the aluminum hydroxide filtering washing liquor is 80-150g/L, and the concentration of the aluminum oxide is 40-90 g/L.
Further, in the step (2), the solid-liquid separation process of the carbon content slurry obtained in the step (1) is to filter the carbon content slurry to obtain a solid-phase material and a liquid-phase material.
Further, the average grain diameter of the aluminum hydroxide material obtained in the step (2) is 70-150 microns, and the content of impurities (dry basis) in the aluminum hydroxide material is 0-3% by mass percent.
Furthermore, the sintering process in the step (3) is carried out in an aerobic environment with air being sucked in under the negative pressure of the clinker kiln at the temperature of 1300-1600 ℃.
Further, the green slurry prepared by the sintering method through batching in the step (3) comprises the following components in percentage by mass: 30-45% of liquid phase, 8-20% of CaO content and Na210-22% of O, SiO25% -10% of Fe2O31-6% of Al2O3The content is 18-30%; wherein, the liquid phase comprises the following components by mass percent: 5-100% of carbon content mother liquor and 0-95% of sintering process mother liquor.
Further, Na in the mother liquor of the sintering method2The concentration of O is 160-270g/L, Al2O3The concentration is 10-45 g/L.
Furthermore, in the step (3), organic matters in the carbon precipitation mother liquor are converted into caustic alkali in the sintering process, so that the caustic alkali is replaced by alkali supplement in the sintering method.
The method has the value that the method can effectively remove a large amount of organic matters in the Bayer process system seed precipitation mother liquor, and avoids the production technical problems of seed precipitation decomposition rate reduction caused by the rising of the organic matters in the Bayer process system, granularity refinement of alumina products, reduction of product whiteness, scar thickening of heat exchange equipment, centralized scar thickening of a seed precipitation tank, easy shedding, sedimentation in the system, reduction of the operation efficiency of a filtering process and the like.
The invention has the beneficial technical effects that:
(1) the method removes the organic matters in the liquid phase of the seed precipitation mother liquor of the Bayer process by a burning mode, and can effectively remove a large amount of soluble organic matters in a Bayer process system.
(2) The organic matter component is mixed into a clinker kiln as a part of raw slurry and sintered, so that the organic matter in the mother liquor is converted into caustic sodium oxide component in the clinker and is efficiently recycled in a sintering system.
(3) Through carbonation decomposition, the alumina concentration in the Bayer process mother liquor can be reduced, and the problem of raw material leakage or overhigh kiln temperature caused by directly adding the Bayer process mother liquor with high alumina concentration into raw slurry is avoided.
(4) By controlling the carbonation decomposition conditions, products or intermediate products with high added values can be produced according to market requirements or process requirements.
(5) The method does not add new cost increase points in each process link, and is an efficient and low-consumption method for removing the organic matters in the Bayer process system.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
Example 1
240 ten thousand tons of alumina are produced in a Bayer process flow of an alumina factory every year, and 20 ten thousand tons of alumina are produced in a sintering process flow every year. The Bayer process system has an average daily organic carbon inlet term of 21t, the Bayer process routine material inlet and outlet of the plant has an average daily organic carbon outlet term of 18t, and the daily organic carbon accumulation is 3 t. As a result of this accumulation, the Bayer process flow of the plant cannot be kept in continuous, efficient and low-consumption operation.
The plant will have a total sodium oxide concentration of 175 g/mlL (caustic soda concentration: 157g/L, among others), alumina (Al)2O3) The Bayer process seed precipitation mother liquor with the concentration of 87g/L and the organic carbon concentration of 9.64g/L is conveyed into a carbon precipitation tank. Introducing carbon dioxide gas for carbonation decomposition. The carbon dioxide consumption was 270m3/m3Under the condition of continuous operation of seed precipitation mother liquor, the average carbon content of the seed precipitation mother liquor can reach 500m per day3The percentage of the carbon content in the mother liquor is 0.5 percent of the total seed precipitation mother liquor, 32t of carbon content aluminum hydroxide products are produced, and 3.9-4.8t of organic carbon is brought out. By the method, the process dilemma of organic carbon accumulation of the Bayer process system of the plant can be effectively reversed, and the continuous, efficient and low-consumption operation of the Bayer process production flow of the plant is ensured.
The carbon slurry after carbonation decomposition had a total sodium oxide concentration of 187g/L (wherein, caustic sodium oxide concentration is 19g/L) and alumina (Al)2O3) The concentration is 23g/L, the decomposition rate of the alumina in the liquid phase is 75%, and the raw slurry is mixed by evaporation and sintering method to be used as a part of the raw slurry (wherein, the raw slurry prepared by the mixing method by the sintering method comprises the following components by mass percent: 30% of liquid phase, 20% of CaO content and Na2O content 10% SiO2Content 5% Fe2O31% of Al2O3The content is 30 percent; wherein, the liquid phase comprises the following components by mass percent: 21% of carbon content mother liquor, 79% of sintering process mother liquor and Na in sintering process mother liquor2O concentration 160g/L, Al2O3The concentration is 45g/L), the process requirement of clinker sintering can be met, and the sintering temperature is 1300 ℃. The alkali and organic matters in the carbon precipitation mother liquor are converted into caustic sodium oxide component of clinker every day, and the caustic sodium oxide component enters the sintering process flow and is recycled with high efficiency and low consumption.
Carbonated decomposed aluminum hydroxide, SiO20.253% of Fe2O30.002% of Na2The O content is 0.453 percent, the average grain diameter is 115 microns, and the aluminum hydroxide can be used as aluminum hydroxide which is blended with a Bayer process to produce metallurgical-grade aluminum oxide products by roasting.
Example 2
50 ten thousand tons of alumina are produced in a Bayer process flow of an alumina plant every year, 150 ten thousand tons of alumina are produced in a sintering process flow every year, the daily organic carbon entry of a Bayer process system of the plant is 10t on average, the daily organic carbon entry of the conventional materials in and out of the Bayer process of the plant is 4t on average, and the daily organic carbon accumulation is 6 t.
The plant measured the total sodium oxide concentration of 211g/L (of which, caustic soda concentration was 200g/L), alumina (Al)2O3) The Bayer process seed precipitation mother liquor with the concentration of 113g/L and the organic carbon concentration of 5g/L is conveyed into a carbon precipitation tank and is mixed with sintering process seed precipitation mother liquor (the caustic sodium oxide concentration in the liquid phase is 150g/L, and the alumina concentration in the liquid phase is 90g/L) according to the volume ratio of 1: 9. Introducing carbon dioxide gas for carbonation decomposition. Carbon dioxide consumption of 1000m3/m3-seed precipitation liquor. Under the condition of continuous operation, the average carbon content of the Bayer process seed precipitation mother liquor can reach 1500m per day3And the proportion of the organic carbon is 10 percent of the total seed precipitation mother liquor, the organic carbon is carried out for 7.5t, and 64t of carbon precipitation aluminum hydroxide products are produced. By the method, the process dilemma of organic carbon accumulation of the Bayer process system of the plant can be effectively reversed, and the continuous, efficient and low-consumption operation of the Bayer process production flow of the plant is ensured.
The carbon slurry after carbonation decomposition has a total sodium oxide concentration of 213g/L (wherein the caustic sodium oxide concentration is 35g/L) and alumina (Al)2O3) The concentration is 70g/L, the decomposition rate of the alumina in the liquid phase is 38%, and the alumina is used as a part of raw slurry after evaporation and batching (wherein, the raw slurry prepared by batching in a sintering method comprises the following components in percentage by mass: liquid phase 45%, CaO content 10%, Na2O content 21%, SiO29% of Fe2O35% of Al2O3The content is 19 percent; wherein, the liquid phase comprises the following components by mass percent: 5% of carbon content mother liquor, 95% of sintering process mother liquor and Na in sintering process mother liquor2O concentration 260g/L, Al2O3The concentration is 11g/L), the process requirement of clinker sintering can be met, and the sintering temperature is 1500 ℃. Carbon points per day of alkali and organic matter (as Na) in mother liquor2Calculated as O) is fed into the sintering process at 213t, and all the components are converted into caustic sodium oxide components of clinker, and the caustic sodium oxide components are fed into the sintering process and recycled with high efficiency and low consumption.
Carbonated decomposed aluminum hydroxide, SiO20.012% of Fe2O30.002% of Na2The O content is 0.30 percent, the average grain diameter is 150 microns, and the aluminum hydroxide can be directly sold as a commodity.
Example 3
500 ten thousand tons of alumina are produced in a Bayer process flow of an alumina plant every year, organic carbon entry of a Bayer process system with 10 ten thousand tons of alumina is average 40t every day in a sintering process flow every year, organic carbon entry of the conventional materials in and out of the Bayer process of the plant is average 35t every day, and the organic carbon accumulation amount of the Bayer process of the plant is 5t every day.
The plant measured the total sodium oxide concentration of 141g/L (of which, caustic soda concentration was 130g/L), alumina (Al)2O3) The Bayer process pregnant solution with the concentration of 69g/L and the organic carbon concentration of 5g/L is conveyed into a carbon precipitation tank and mixed with sintering process aluminum hydroxide filter washing liquid (the caustic sodium oxide concentration in the liquid phase is 80g/L, and the alumina concentration in the liquid phase is 40g/L) according to the volume ratio of 5: 1. Introducing carbon dioxide gas for carbonation decomposition. The consumption of carbon dioxide is 100m3/m3-seed precipitation liquor. Under the condition of continuous operation, the average carbon content of the Bayer process seed precipitation mother liquor can reach 1000m per day3And the proportion of the organic carbon is 0.4 percent of the total seed precipitation mother liquor, the organic carbon is 7t, and 69t of carbon precipitation aluminum hydroxide products are produced. By the method, the process dilemma of organic carbon accumulation of the Bayer process system of the plant can be effectively reversed, and the continuous, efficient and low-consumption operation of the Bayer process production flow of the plant is ensured.
The total sodium oxide concentration of the carbonated decomposed slurry was 142g/L (caustic sodium oxide concentration: 0g/L), and alumina (Al)2O3) The concentration is 0g/L, the decomposition rate of the alumina in the liquid phase is 100%, and the raw slurry is mixed by evaporation and sintering method to be used as a part of the raw slurry (wherein, the raw slurry prepared by the mixing method by the sintering method comprises the following components by mass percent: liquid phase 40%, CaO content 15%, Na2O content 16%, SiO2Content 7% Fe2O3Content 3% of Al2O3The content is 25 percent; wherein, the liquid phase comprises the following components by mass percent: 100% of carbon content mother liquor), can meet the process requirement of clinker sintering, and the sintering temperature is 1600 ℃. The alkali and organic matters in the carbon content mother liquor are converted into caustic sodium oxide component of clinker, and then the caustic sodium oxide component enters the sintering processAnd is recycled with high efficiency and low consumption.
Carbonated decomposed aluminum hydroxide, SiO2Content 2.61%, Fe2O30.002% of Na2The content of O is 0.35 percent, the average grain diameter is 70 microns, and the aluminum hydroxide can be used for distributing aluminum hydroxide by a blending Bayer process to produce metallurgical-grade aluminum oxide products by roasting.
Comparative example
240 ten thousand tons of alumina are produced in a Bayer process flow of an alumina factory every year, and 20 ten thousand tons of alumina are produced in a sintering process flow every year. The Bayer process system has an average daily organic carbon inlet term of 21t, the Bayer process routine material inlet and outlet of the plant has an average daily organic carbon outlet term of 18t, and the daily organic carbon accumulation is 3 t. After 1 year of accumulation, the concentration of Bayer process liquid phase organic carbon in the factory is increased by 1 time, the productivity of filtering equipment such as a Bayer process flow leaf filter, a vertical disc filter and the like is reduced, a foam layer of a seed precipitation tank is thickened, and oxalate generated and separated by degradation of aluminum hydroxide fine seed crystals and organic matters is enriched in foam, so that the granularity of products is refined, and the quality is degraded.
| Unit: t/d | Organic carbon intake | Organic carbon outturn | Organic carbon accumulation in process | Consequence of |
| Comparative example | 21 | 18 | Accumulation of | The productivity is reduced and the production efficiency is lowered,deterioration of product quality |
| Example 1 | 21 | 22 | Does not accumulate | Without adverse effects |
| Example 2 | 10 | 11.5 | Does not accumulate | Without adverse effects |
| Example 3 | 40 | 42 | Does not accumulate | Without adverse effects |
The results show that:
1. the method can effectively improve the removal amount of organic matters in the circulation of the Bayer process system of the alumina plant, reverse the process dilemma of organic matter accumulation and eliminate the negative influence of the organic matter accumulation of the Bayer process system on the production flow.
2. The invention can efficiently and lowly utilize all valuable materials generated in the material conversion process without increasing the process links of high cost investment.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention. It should be noted that other equivalent modifications can be made by those skilled in the art in light of the teachings of the present invention, and all such modifications can be made as are within the scope of the present invention.
Claims (13)
1. A method for removing organic matters in seed precipitation mother liquor of a Bayer process is characterized by comprising the following steps:
(1) carbonating and decomposing Bayer process seed precipitation mother liquor:
conveying the Bayer process seed precipitation mother liquor into a carbon precipitation tank, introducing carbon dioxide into the carbon precipitation tank, and performing carbonation decomposition to obtain carbon precipitation slurry;
(2) and (3) carrying out solid-liquid separation on the carbon slurry:
carrying out solid-liquid separation on the carbon content slurry obtained in the step (1), wherein the obtained solid phase is an aluminum hydroxide material, and the obtained liquid phase is a carbon content mother liquor;
(3) and (3) carbon separation mother liquor proportioning and sintering:
and (3) carrying out evaporation and batching processes on the carbon content mother liquor obtained in the step (2), and then entering a clinker kiln for sintering.
2. The method according to claim 1, wherein the quality of the Bayer process pregnant solution is 0.2-10% of the total pregnant solution in the Bayer process alumina production process.
3. The process as claimed in claim 1, wherein the Bayer process pregnant liquor comprises an aqueous solution of sodium aluminate, sodium hydroxide, sodium carbonate and sodium salts of organic acids.
4. The method according to claim 3, wherein the sodium aluminate concentration is 69-113g/L in terms of alumina concentration; the concentration of the sodium hydroxide is 130-200g/L in terms of the concentration of caustic soda; the concentration of the sodium carbonate is 5-20g/L calculated by the concentration of sodium oxide; the concentration of the organic acid sodium salt is 4-20g/L calculated by all organic carbon.
5. The method of claim 1, wherein step (1) is performed every m3The Bayer process seed precipitation mother liquor consumes 100m3-1000m3Carbon dioxide.
6. The method according to claim 1, wherein the alumina concentration in the carbon-containing slurry in the step (1) is 0-70g/L, and the carbonation decomposition rate is 38-100%.
7. The method according to claim 1, wherein in the step (1), the Bayer process mother liquor and other materials in the alumina production process are mixed and then subjected to carbonation decomposition, the proportion of the other materials is 0-90% by mass, the other materials are sintering process seed precipitation mother liquor or an aluminum hydroxide filter washing liquid, the concentration of caustic sodium oxide in the sintering process seed precipitation mother liquor or the aluminum hydroxide filter washing liquid is 80-150g/L, and the concentration of aluminum oxide is 40-90 g/L.
8. The method according to claim 1, wherein the step (2) of solid-liquid separating the carbon slurry obtained in the step (1) is to filter the carbon slurry to obtain a solid-phase material and a liquid-phase material.
9. The method according to claim 1, wherein the average particle size of the aluminum hydroxide material obtained in the step (2) is 70-150 μm, and the content of impurities in the aluminum hydroxide material is 0-3% by mass.
10. The method as claimed in claim 1, wherein the sintering process of step (3) is carried out in an aerobic environment with air being sucked in under the negative pressure of the clinker kiln at a temperature of 1300 ℃ to 1600 ℃.
11. The method according to claim 1, wherein the step (3) of preparing raw slurry by sintering comprises the following steps in percentage by mass: 30-45% of liquid phase, 8-20% of CaO content and Na210-22% of O, SiO25% -10% of Fe2O31-6% of Al2O3The content is 18-30%; wherein, the liquid phase comprises the following components by mass percent: 5-100% of carbon content mother liquor and 0-95% of sintering process mother liquor.
12. The method of claim 11, wherein the method is performed in a batch processCharacterized in that Na in the mother liquor of the sintering method2The concentration of O is between 160-270g/L, Al2O3The concentration is 10-45 g/L.
13. The method according to claim 1, wherein in the step (3), organic matters in the carbon precipitation mother liquor are converted into caustic alkali during the sintering process and become a substitute for alkali supplement in the sintering process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010656029.0A CN111892073A (en) | 2020-07-09 | 2020-07-09 | Method for removing organic matters in seed precipitation mother liquor by Bayer process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010656029.0A CN111892073A (en) | 2020-07-09 | 2020-07-09 | Method for removing organic matters in seed precipitation mother liquor by Bayer process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111892073A true CN111892073A (en) | 2020-11-06 |
Family
ID=73191961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010656029.0A Pending CN111892073A (en) | 2020-07-09 | 2020-07-09 | Method for removing organic matters in seed precipitation mother liquor by Bayer process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111892073A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112357942A (en) * | 2020-12-03 | 2021-02-12 | 中铝中州铝业有限公司 | Method for improving whiteness of aluminum hydroxide product by Bayer process |
| CN114105178A (en) * | 2020-12-23 | 2022-03-01 | 中铝中州铝业有限公司 | Method for improving organic carbon removal rate of Bayer process evaporation mother liquor |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1686806A (en) * | 2005-05-18 | 2005-10-26 | 中国铝业股份有限公司 | Alkali supplement method in production of alumina |
| CN101058433A (en) * | 2007-05-31 | 2007-10-24 | 中国铝业股份有限公司 | Method of purifying organic substance in solution by Bayer method |
| JP2008019158A (en) * | 2006-06-14 | 2008-01-31 | Hiroko Ishikuri | Method for producing high purity aluminum hydroxide and high purity aluminum hydroxide obtained by the method |
| CN101734696A (en) * | 2009-12-14 | 2010-06-16 | 中铝国际技术发展有限公司 | Method for removing organic matter by Bayer process |
| CN101837999A (en) * | 2010-06-10 | 2010-09-22 | 中国铝业股份有限公司 | Preparation method of Beta-type aluminum hydroxide |
| CN108793213A (en) * | 2018-07-05 | 2018-11-13 | 云南文山铝业有限公司 | The method and device of organic matter in aluminium ash sintering process cooperation-removal aluminium oxide mother liquor |
-
2020
- 2020-07-09 CN CN202010656029.0A patent/CN111892073A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1686806A (en) * | 2005-05-18 | 2005-10-26 | 中国铝业股份有限公司 | Alkali supplement method in production of alumina |
| JP2008019158A (en) * | 2006-06-14 | 2008-01-31 | Hiroko Ishikuri | Method for producing high purity aluminum hydroxide and high purity aluminum hydroxide obtained by the method |
| CN101058433A (en) * | 2007-05-31 | 2007-10-24 | 中国铝业股份有限公司 | Method of purifying organic substance in solution by Bayer method |
| CN101734696A (en) * | 2009-12-14 | 2010-06-16 | 中铝国际技术发展有限公司 | Method for removing organic matter by Bayer process |
| CN101837999A (en) * | 2010-06-10 | 2010-09-22 | 中国铝业股份有限公司 | Preparation method of Beta-type aluminum hydroxide |
| CN108793213A (en) * | 2018-07-05 | 2018-11-13 | 云南文山铝业有限公司 | The method and device of organic matter in aluminium ash sintering process cooperation-removal aluminium oxide mother liquor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112357942A (en) * | 2020-12-03 | 2021-02-12 | 中铝中州铝业有限公司 | Method for improving whiteness of aluminum hydroxide product by Bayer process |
| CN114105178A (en) * | 2020-12-23 | 2022-03-01 | 中铝中州铝业有限公司 | Method for improving organic carbon removal rate of Bayer process evaporation mother liquor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2023509228A (en) | Complete resource recycling method for wastewater from sulfuric acid titanium white production | |
| CN111892073A (en) | Method for removing organic matters in seed precipitation mother liquor by Bayer process | |
| CN112499813A (en) | Production method for full resource recycling of waste water in titanium dioxide production by sulfuric acid process | |
| CN115417431B (en) | Method for extracting potassium in process of producing alumina by Bayer process | |
| CN110028087B (en) | Method for reducing carbon-alkali concentration of system in alumina production process | |
| CN106629847A (en) | Method for preparing vanadium trioxide from sodium-vanadate salt | |
| CN112758964A (en) | Process for producing lithium carbonate by mixing spodumene and salt lake ore | |
| WO2021036391A1 (en) | Method for removing humate and oxalate impurities in bayer liquor | |
| CN113149048B (en) | Method for treating sodium oxalate solid waste residues in alumina production process | |
| CN211920886U (en) | Device for preparing battery-grade lithium carbonate by using membrane separation technology | |
| CN112551564B (en) | Deep purification method of sodium aluminate solution | |
| CN1152823C (en) | High-purity barium carbonate productive technology for electronic material | |
| CN115108584A (en) | Method for efficiently preparing vanadium pentoxide and calcium carbonate by using calcium vanadate | |
| CN103991851A (en) | New process for green and cyclic production of hydrazine hydrate | |
| CN101935061A (en) | Method for removing impurity of mother liquid in preparation process of calcium carbonate crystal whisker | |
| CN113912093B (en) | Method for thickening evaporation mother liquor and discharging sodium carbonate salt in alumina production | |
| EP1351886B1 (en) | Process for removing contaminants from bayer liquors | |
| US20220402786A1 (en) | Production method for full resource recycling of sulphate-process titanium dioxide production wastewater | |
| CN114735736B (en) | Method for removing various organic compounds in sodium aluminate solution in alumina production | |
| CN111268702A (en) | Method and device for preparing battery-grade lithium carbonate by using membrane separation technology | |
| CN114477257B (en) | Method for preparing low-sodium low-iron aluminum hydroxide flame retardant and co-producing ammonium chloride by using circulating fluidized bed fly ash | |
| CN221027728U (en) | System for utilize crude calcium nitrate liquid preparation fused salt level sodium nitrate | |
| CN116177779B (en) | Method for recycling titanium dioxide wastewater | |
| CN113460976B (en) | Purification method of tin-containing tellurium dioxide | |
| CN112142083A (en) | Method for removing organic matters in aluminum hydroxide washing liquor by secondary thickening |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201106 |
|
| RJ01 | Rejection of invention patent application after publication |