CN112830508A - Method for preparing aluminum hydroxide by using aluminum ash denitrification and fluorine fixation clinker - Google Patents
Method for preparing aluminum hydroxide by using aluminum ash denitrification and fluorine fixation clinker Download PDFInfo
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- 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
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/14—Aluminium oxide or hydroxide from alkali metal aluminates
- C01F7/141—Aluminium oxide or hydroxide from alkali metal aluminates from aqueous aluminate solutions by neutralisation with an acidic agent
- C01F7/142—Aluminium oxide or hydroxide from alkali metal aluminates from aqueous aluminate solutions by neutralisation with an acidic agent with carbon dioxide
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- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
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Abstract
The invention discloses a method for preparing aluminum hydroxide by using aluminum ash denitrification and fluorine fixation clinker. Firstly, roasting aluminum ash serving as a raw material to prepare a crude zeolite product, namely a cooked material A; adding water into the clinker A for leaching and carrying out solid-liquid separation to obtain a filter cake B and a filtrate C; drying the filter cake B to obtain a zeolite product; introducing CO into the obtained filtrate C2Carrying out carbonation decomposition reaction on the gas, and carrying out solid-liquid separation after the reaction to obtain a white precipitate D and a filtrate E; drying the white precipitate D to obtain an aluminum hydroxide product; and concentrating and crystallizing the obtained filtrate E to obtain sodium carbonate which is used as a medicament and returned to the roasting process for recycling. The invention has no waste water and waste residue discharge in the whole operation process and is environment-friendly; the process for preparing the aluminum hydroxide does not generate the red mud, and meets the production requirements of industrialized green factories.
Description
The technical field is as follows:
the invention relates to the technical field of resource utilization of hazardous waste in aluminum industry (including electrolytic aluminum, aluminum processing and secondary aluminum), in particular to a method for preparing aluminum hydroxide by using aluminum ash denitrification and fluorine fixation clinker.
Secondly, background art:
the aluminum ash is solid waste generated in the processes of electrolytic aluminum, aluminum processing and casting of secondary aluminum, and the main components of the aluminum ash are metallic aluminum, aluminum oxide, aluminum nitride, silicon dioxide, chloride, fluoride and the like. At present, most of aluminum ash treatment modes at home and abroad are extensive treatment, metal aluminum contained in the aluminum ash is generally extracted by adopting methods of ball milling separation, ash frying separation, hot pressing separation and centrifugal separation, and a large amount of residual aluminum ash is stockpiled in workshops, dangerous waste depots or landfill sites. The aluminum ash contains 10-30% of aluminum nitride, is relatively active, is easy to generate hydrolysis reaction when meeting water to generate ammonia gas, and has great harm to human beings and the environment. In the water leaching method deamination process, aluminum hydroxide and aluminum oxyhydroxide generated by hydrolysis can wrap the surfaces of aluminum nitride particles to inhibit hydrolysis reaction, so that the problem of removing aluminum nitride in aluminum ash by adopting the water leaching method has a technical bottleneck and is not thoroughly solved so far. Therefore, how to thoroughly remove the aluminum nitride in the aluminum ash and solve the problem of ammonia pollution of the aluminum ash has very important significance on harmlessness and subsequent product utilization of the aluminum ash.
At present, related patents report methods for removing aluminum nitride from aluminum ash. For example: 1. the invention patent CN108217688A discloses a method for deeply hydrolyzing aluminum nitride in aluminum ash, which comprises the steps of grinding, hydrolyzing and deaminating, wherein aluminum hydroxide newly generated on the surface of aluminum nitride is removed by grinding, but the aluminum nitride cannot be completely removed due to the limited solubility of ammonia in aqueous solution and mild hydrolysis conditions. 2. The invention patent CN108671462A discloses a method for removing nitrogen from aluminum ash, which is to add a reactant in the hydrolysis reaction process of aluminum ash to promote the generated ammonia to combine with the reactant to generate ammonium salt which is dissolved in the solution, but the method has relatively high recovery cost of the reagent and the ammonium salt. 3. The invention patent CN110314923A discloses a method for strengthening aluminum ash desalination and denitrification, which comprises two stages of hydrolysis processes of normal-temperature stirring ball milling and high-temperature alkali adding, and the method comprises the steps of ball milling aluminum ash slurry for a certain time, filtering fine slurry to obtain a filter cake and a filtrate, evaporating the filtrate to recover industrial salt, mixing the filter cake with alkali liquor, stirring and hydrolyzing, and absorbing generated ammonia gas to obtain ammonia water or ammonium salt. 4. The invention patent CN109928413A discloses a method for synchronously preparing sodium aluminate by sintering and denitrifying aluminum ash with soda, which comprises the steps of uniformly mixing aluminum ash with a mixed sodium salt consisting of sodium carbonate, sodium bicarbonate and sodium peroxide, and pressing into a briquette; and drying the obtained block mass, sequentially placing the block mass in an air atmosphere for first-stage low-temperature roasting and placing the block mass in a strong oxidizing atmosphere for second-stage high-temperature roasting, cooling and crushing the roasted product, and leaching the roasted product by using an alkaline solution to obtain a sodium aluminate solution. The method has long flow, the aluminum ash needs to be agglomerated and roasted in two sections, and the production cost is high. 5. The invention patent CN111170325A discloses a method for synchronously preparing zeolite by denitrifying and fixing fluorine in aluminum ash, which is characterized in that a material containing sodium oxide and/or potassium oxide and a material containing calcium oxide and/or potassium oxide are added into the aluminum ashThe magnesium oxide materials are uniformly mixed, the mixture is placed in a high-temperature furnace for heating treatment, the mixture is kept in full contact with air in the heating process, aluminum nitride is converted into aluminum oxide and nitrogen at high temperature, and the roasted clinker is coarse zeolite. XRD analysis showed that the main phase of the clinker was Na2O·xAl2O3·ySiO2·zH2O and NaAlO2. The method can prepare zeolite at low cost while removing nitrogen and fixing fluorine from aluminum ash, has no secondary pollution, and meets the production requirements of industrial green factories. However, this method does not allow for the efficient use of other components in the clinker.
Thirdly, the invention content:
the technical problem to be solved by the invention is as follows: aiming at the defects of the prior art in the aspects of aluminum ash deamination treatment and subsequent productization, the invention provides a method for preparing aluminum hydroxide by using aluminum ash denitrification and fluorine fixation clinker. The method can extract the aluminum hydroxide from the clinker leaching solution after the aluminum ash is subjected to denitrification and fluorine fixation and zeolite is synchronously prepared, so that the full utilization of the aluminum ash component is realized, and the method is a further improvement of the invention patent CN 111170325A.
In order to solve the problems, the invention adopts the technical scheme that:
the invention provides a method for preparing aluminum hydroxide by using aluminum ash denitrification and fluorine fixation clinker, which comprises the following steps:
a. firstly, roasting aluminum ash serving as a raw material to prepare a crude zeolite product, namely a cooked material A;
b. b, adding water into the clinker A obtained in the step a for leaching, carrying out solid-liquid separation after leaching, and separating to obtain a filter cake B and a filtrate C; drying the obtained filter cake B to obtain a zeolite product;
c. introducing CO into the filtrate C obtained in the step b2Carrying out carbonation decomposition reaction on the gas, carrying out solid-liquid separation on the product obtained after the reaction, and obtaining white precipitate D and filtrate E after the separation;
d. drying the white precipitate D obtained in the step c, and drying to obtain an aluminum hydroxide product; and concentrating and crystallizing the obtained filtrate E to obtain sodium carbonate.
According to the method for preparing aluminum hydroxide by using the aluminum ash denitrification and fluorine fixation clinker, the aluminum ash is used as a raw material in the step a and is roasted to prepare a coarse zeolite product, and the adopted method is the technical scheme described in application number 202010059394.3.
According to the method for preparing the aluminum hydroxide by using the aluminum ash denitrification and fluorine fixation clinker, when the clinker A is leached by adding water in the step b, the liquid-solid ratio is controlled to be 2-8: 1; the leaching time is 20-90 min.
According to the method for preparing the aluminum hydroxide by using the aluminum ash denitrification and fluorine fixation clinker, when the clinker A is leached by adding water in the step b, the liquid-solid ratio is controlled to be 4-8: 1; the leaching time is 45-90 min.
According to the method for preparing the aluminum hydroxide by using the aluminum ash denitrification fluorine-fixing clinker, the time of the carbonation decomposition reaction in the step c is 5-45 min; said introduction of CO2Control of CO when gas is present2The flow rate of the gas is 0.2-5L/min.
According to the method for preparing the aluminum hydroxide by using the aluminum ash denitrification fluorine-fixing clinker, the time of the carbonation decomposition reaction in the step c is 15-45 min; said introduction of CO2Control of CO when gas is present2The flow rate of the gas is 1-5L/min.
According to the method for preparing the aluminum hydroxide by using the aluminum ash denitrification and fluorine fixation clinker, the sodium carbonate obtained in the step d is returned to the roasting process as a medicament for recycling.
In the technical scheme of the invention, when the clinker A is leached, the liquid-solid ratio is too low, and soluble components of the clinker A are slowly dissolved and incompletely dissolved; the liquid-solid ratio is too high, the water consumption is large, and the production cost is increased. Therefore, the liquid-solid ratio is one of the key points of the technical scheme of the invention.
In the technical scheme of the invention, when the clinker A is leached, the water leaching time is too short, and the soluble components of the clinker A are not completely dissolved; the water immersion time is too long, the energy consumption is high, and the production cost is increased. Therefore, the leaching time is also one of the key points of the technical scheme of the invention.
In the technical scheme of the invention, CO is introduced into the filtrate C2When the gas is subjected to carbonation decomposition reaction, the decomposition time is too short and the gas is generatedThe reaction of the aluminum hydroxide is incomplete, and the product yield is low; too long decomposition time not only causes CO2The consumption of gas is large and sodium carbonate is easily generated into sodium bicarbonate. Therefore, the decomposition reaction time is also one of the key points of the technical scheme of the invention.
In the technical scheme of the invention, CO is introduced into the filtrate C2CO during the carbonation decomposition reaction of gas2The reaction time required by the excessively low flow is long, and the production efficiency is low; CO 22Too high flow rate easily causes peritectic inclusions and affects the purity of the aluminum hydroxide product. Thus, CO2The flow rate is also one of the key points of the technical scheme of the invention.
The main chemical reactions in the process of heating the aluminum ash are as follows:
C+O2→CO2；
2Al+1.5O2→Al2O3；
2NaHCO3→Na2CO3+CO2+H2O；
Na2CO3+xAl2O3+ySiO2+zH2O→Na2O·xAl2O3·ySiO2·zH2O+CO2；
Na2CO3+Al2O3→2NaAlO2+CO2；
K2CO3+Al2O3→2KAlO2+CO2；
2KHCO3→K2CO3+CO2+H2O；
K2CO3+xAl2O3+ySiO2+zH2O→K2O·xAl2O3·ySiO2·zH2O+CO2；
Ca(HCO3)2→CaCO3+CO2+H2O；
2AlN+1.5O2→Al2O3+N2；
CaCO3+2NaF→CaF2+Na2CO3；
Mg(HCO3)2→MgCO3+CO2+H2O；
MgCO3+2NaF→MgF2+Na2CO3。
the main chemical reactions in the carbonation decomposition process of the method of the invention are as follows:
2NaAlO2+CO2+3H2O→2Al(OH)3+Na2CO3
because the denitrification efficiency mainly depends on the reaction of aluminum nitride in aluminum ash to generate alumina, and the aluminum nitride in the aluminum ash is wrapped by the alumina, the aluminum ash is roasted by adopting the method disclosed by the invention patent application with the application number of 202010059394.3, the agent firstly reacts with the alumina on the surface layer of the aluminum nitride to generate zeolite with a porous structure, and along with the generation of the product zeolite, oxygen can react with the aluminum nitride on the inner layer through pores in the zeolite, so that the aluminum nitride is continuously changed into the alumina and nitrogen, the aim of efficiently denitrifying is fulfilled, and the denitrification rate is up to more than 99%. As the clinker A is in a porous zeolite structure, soluble components in the clinker A are easier to leach out, and the subsequent extraction of aluminum hydroxide is easier.
The invention has the following positive beneficial effects:
the technical scheme of the invention utilizes the aluminum industrial waste residue aluminum ash as the main raw material, has wide raw material source and low cost, firstly adopts the method disclosed by the invention patent application No. 202010059394.3 to roast and treat the aluminum ash, does not cause environmental pollution in the denitrification process, can prepare zeolite at low cost while denitrifying and fixing fluorine, has no secondary pollution, and meets the production requirements of industrialized green factories; the porous structure of the zeolite is not only beneficial to denitrification, but also beneficial to leaching soluble components in clinker; the method for extracting the aluminum hydroxide by carbonation decomposition has low cost and high product purity, does not generate red mud, and realizes green full utilization of aluminum ash components. The method has the advantages of cheap and easily-obtained reaction reagents, no pollution, simple operation of the whole process and suitability for industrial popularization and application.
In conclusion, the invention has obvious economic benefit and social benefit.
Fourthly, the specific implementation mode:
the invention is further illustrated by the following examples, which do not limit the scope of the invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art. The test methods in the following examples are conventional methods unless otherwise specified. The raw material aluminum ash used in the following examples was obtained from the processes of electrolytic aluminum, aluminum processing, and casting of secondary aluminum.
Example 1:
the invention relates to a method for preparing aluminum hydroxide by using aluminum ash denitrification and fluorine fixation clinker, which comprises the following detailed steps:
a. firstly, aluminum ash is used as a raw material, and 1000g of coarse zeolite product, namely clinker A1000g, is prepared by roasting by adopting a method disclosed in the sixth embodiment in the patent application specification of application No. 202010059394.3;
b. adding 8000g of industrial pure water into the clinker A obtained in the step a, stirring and leaching for 30min, and performing solid-liquid separation after leaching to obtain 645g of filter cake B and 8355 g of sodium aluminate-containing solution; drying the obtained filter cake B to obtain a zeolite product;
c. continuously introducing CO into the solution containing sodium aluminate obtained in the step b2The gas is subjected to carbonation decomposition reaction to control CO2The flow rate of the gas is 5L/min; white precipitates generated in the reaction process are more and more, and the decomposition reaction is continued for 15 min; obtaining slurry rich in white precipitate after reaction, then carrying out solid-liquid separation to obtain 261.1g of white precipitate and a solution containing sodium carbonate after separation;
d. drying the white precipitate obtained in the step c, and drying to obtain an aluminum hydroxide product; the obtained solution containing sodium carbonate is concentrated and crystallized to obtain 164.7g of sodium carbonate, and the sodium carbonate is returned to the denitrification and fluorine fixation process for recycling.
Example 2:
the invention relates to a method for preparing aluminum hydroxide by using aluminum ash denitrification and fluorine fixation clinker, which comprises the following detailed steps:
a. firstly, aluminum ash is used as a raw material, and 1000g of coarse zeolite product, namely clinker A1000g, is prepared by roasting by adopting a method disclosed in the first embodiment of the patent application specification of application No. 202010059394.3;
b. b, adding 7000g of industrial pure water into the clinker A obtained in the step a, stirring and leaching, wherein the leaching time is 45min, and after leaching, carrying out solid-liquid separation to obtain 662g of filter cake B and 7338 g of sodium aluminate-containing solution; drying the obtained filter cake B to obtain a zeolite product;
c. continuously introducing CO into the solution containing sodium aluminate obtained in the step b2The gas is subjected to carbonation decomposition reaction to control CO2The flow rate of the gas is 4L/min; white precipitates generated in the reaction process are more and more, and the decomposition reaction is continued for 20 min; obtaining slurry rich in white precipitate after reaction, then carrying out solid-liquid separation to obtain 243.7g of white precipitate and a solution containing sodium carbonate after separation;
d. drying the white precipitate obtained in the step c, and drying to obtain an aluminum hydroxide product; the obtained solution containing sodium carbonate is concentrated and crystallized to obtain 153.7g of sodium carbonate, and the sodium carbonate is returned to the denitrification and fluorine fixation process for recycling.
Example 3:
the invention relates to a method for preparing aluminum hydroxide by using aluminum ash denitrification and fluorine fixation clinker, which comprises the following detailed steps:
a. firstly, aluminum ash is used as a raw material, and 1000g of coarse zeolite product, namely clinker A1000g, is prepared by adopting a method disclosed in the fifth embodiment of the patent application specification of application No. 202010059394.3;
b. b, adding 6000g of industrial pure water into the clinker A obtained in the step a, stirring and leaching, wherein the leaching time is 60min, and performing solid-liquid separation after leaching to obtain 686g of filter cake B and 6314 g of sodium aluminate-containing solution; drying the obtained filter cake B to obtain a zeolite product;
c. continuously introducing CO into the solution containing sodium aluminate obtained in the step b2The gas is subjected to carbonation decomposition reaction to control CO2The flow rate of the gas is 3L/min; white precipitates generated in the reaction process are more and more, and the decomposition reaction is continued for 25 min; after the reaction, the rich white is obtainedCarrying out solid-liquid separation on the slurry of the color precipitate to obtain 219.1g of white precipitate and a solution containing sodium carbonate;
d. drying the white precipitate obtained in the step c, and drying to obtain an aluminum hydroxide product; the obtained solution containing sodium carbonate is concentrated and crystallized to obtain 138.2 g of sodium carbonate, and the sodium carbonate is returned to the denitrification and fluorine fixation process for recycling.
Example 4:
the invention relates to a method for preparing aluminum hydroxide by using aluminum ash denitrification and fluorine fixation clinker, which comprises the following detailed steps:
a. firstly, aluminum ash is used as a raw material, and 1000g of coarse zeolite product, namely clinker A1000g, is prepared by roasting by adopting a method disclosed in the third embodiment in the patent application specification of application No. 202010059394.3;
b. b, adding 5000g of industrial pure water into the clinker A obtained in the step a, stirring and leaching for 75min, carrying out solid-liquid separation after leaching, and separating to obtain 707g of filter cake B and 5293 g of sodium aluminate-containing solution; drying the obtained filter cake B to obtain a zeolite product;
c. continuously introducing CO into the solution containing sodium aluminate obtained in the step b2The gas is subjected to carbonation decomposition reaction to control CO2The flow rate of the gas is 2L/min; white precipitates generated in the reaction process are more and more, and the decomposition reaction is continued for 35 min; after the reaction, slurry rich in white precipitate is obtained, then solid-liquid separation is carried out, and 197.6g of white precipitate and solution containing sodium carbonate are obtained after the separation;
d. drying the white precipitate obtained in the step c, and drying to obtain an aluminum hydroxide product; the obtained solution containing sodium carbonate is concentrated and crystallized to obtain 124.6 g of sodium carbonate, and the sodium carbonate is returned to the denitrification and fluorine fixation process for recycling.
Example 5:
the invention relates to a method for preparing aluminum hydroxide by using aluminum ash denitrification and fluorine fixation clinker, which comprises the following detailed steps:
a. firstly, aluminum ash is used as a raw material, and 1000g of coarse zeolite product, namely clinker A1000g, is prepared by roasting by adopting a method disclosed in the fourth embodiment in the patent application specification of application No. 202010059394.3;
b. adding 4000g of industrial pure water into the clinker A obtained in the step a, stirring and leaching, wherein the leaching time is 90min, carrying out solid-liquid separation after leaching, and separating to obtain 723g of filter cake B and 4277 g of sodium aluminate-containing solution; drying the obtained filter cake B to obtain a zeolite product;
c. continuously introducing CO into the solution containing sodium aluminate obtained in the step b2The gas is subjected to carbonation decomposition reaction to control CO2The flow rate of the gas is 1.5L/min; white precipitates generated in the reaction process are more and more, and the decomposition reaction is continued for 45 min; obtaining slurry rich in white precipitate after reaction, then carrying out solid-liquid separation to obtain 181.2g of white precipitate and a solution containing sodium carbonate after separation;
d. drying the white precipitate obtained in the step c, and drying to obtain an aluminum hydroxide product; the obtained solution containing sodium carbonate is concentrated and crystallized to obtain 114.3 g of sodium carbonate, and the sodium carbonate is returned to the denitrification and fluorine fixation process for recycling.
Example 6:
the invention relates to a method for preparing aluminum hydroxide by using aluminum ash denitrification and fluorine fixation clinker, which comprises the following detailed steps:
a. firstly, aluminum ash is used as a raw material, and 1000g of coarse zeolite product, namely clinker A1000g, is prepared by roasting by adopting a method disclosed in the second embodiment in the patent application specification of application No. 202010059394.3;
b. adding 2000g of industrial pure water into the clinker A obtained in the step a, stirring and leaching, wherein the leaching time is 60min, and after leaching, carrying out solid-liquid separation to obtain 815g of filter cake B and 2185 g of sodium aluminate-containing solution; drying the obtained filter cake B to obtain a zeolite product;
c. continuously introducing CO into the solution containing sodium aluminate obtained in the step b2The gas is subjected to carbonation decomposition reaction to control CO2The flow rate of the gas is 0.2L/min; white precipitates generated in the reaction process are more and more, and the decomposition reaction is continued for 100 min; after the reaction, slurry rich in white precipitate is obtained, then solid-liquid separation is carried out, and after the separation, 87.0g of white precipitate and solution containing sodium carbonate are obtained;
d. drying the white precipitate obtained in the step c, and drying to obtain an aluminum hydroxide product; the obtained solution containing sodium carbonate is concentrated and crystallized to obtain 54.9 g of sodium carbonate, and the sodium carbonate is returned to the denitrification and fluorine fixation process for recycling.
Example 7:
the invention relates to a method for preparing aluminum hydroxide by using aluminum ash denitrification and fluorine fixation clinker, which comprises the following detailed steps:
a. firstly, aluminum ash is used as a raw material, and a mixed raw material of examples II, III and V in the patent application specification with the application number of 202010059394.3 is roasted to prepare 1000g of crude zeolite product, namely a cooked material A1000 g;
b. 9000g of industrial pure water is added into the clinker A obtained in the step a, the mixture is stirred and leached, the leaching time is 20min, solid-liquid separation is carried out after leaching, and 799g of filter cake B and 9201 g of solution containing sodium aluminate are obtained through separation; drying the obtained filter cake B to obtain a zeolite product;
c. continuously introducing CO into the solution containing sodium aluminate obtained in the step b2The gas is subjected to carbonation decomposition reaction to control CO2The flow rate of the gas is 6L/min; white precipitates generated in the reaction process are more and more, and the decomposition reaction is continued for 5 min; obtaining slurry rich in white precipitate after reaction, then carrying out solid-liquid separation to obtain 103.4g of white precipitate and a solution containing sodium carbonate after separation;
d. drying the white precipitate obtained in the step c, and drying to obtain an aluminum hydroxide product; the obtained solution containing sodium carbonate is concentrated and crystallized to obtain 65.2 g of sodium carbonate, and the sodium carbonate is returned to the denitrification and fluorine fixation process for recycling.
Claims (7)
1. A method for preparing aluminum hydroxide by using aluminum ash denitrification and fluorine fixation clinker is characterized by comprising the following steps:
a. firstly, roasting aluminum ash serving as a raw material to prepare a crude zeolite product, namely a cooked material A;
b. b, adding water into the clinker A obtained in the step a for leaching, carrying out solid-liquid separation after leaching, and separating to obtain a filter cake B and a filtrate C; drying the obtained filter cake B to obtain a zeolite product;
c. introducing CO into the filtrate C obtained in the step b2Carrying out carbonation decomposition reaction on the gas, carrying out solid-liquid separation on the product obtained after the reaction, and obtaining white precipitate D and filtrate E after the separation;
d. drying the white precipitate D obtained in the step c, and drying to obtain an aluminum hydroxide product; and concentrating and crystallizing the obtained filtrate E to obtain sodium carbonate.
2. The method for preparing the aluminum hydroxide by using the aluminum ash denitrification fluorine fixation clinker as claimed in claim 1, which is characterized in that: in the step a, the aluminum ash is used as a raw material to be roasted to prepare a coarse zeolite product, and the adopted method is the technical scheme recorded in application number 202010059394.3.
3. The method for preparing the aluminum hydroxide by using the aluminum ash denitrification fluorine fixation clinker as claimed in claim 1, which is characterized in that: and b, when the clinker A is leached by adding water in the step b, controlling the liquid-solid ratio to be 2-8: 1; the leaching time is 20-90 min.
4. The method for preparing aluminum hydroxide by using the aluminum ash denitrification fluorine fixation clinker as claimed in claim 3, wherein the method comprises the following steps: and b, when the clinker A is leached by adding water in the step b, controlling the liquid-solid ratio to be 4-8: 1; the leaching time is 45-90 min.
5. The method for preparing the aluminum hydroxide by using the aluminum ash denitrification fluorine fixation clinker as claimed in claim 1, which is characterized in that: the time of the carbonation decomposition reaction in the step c is 5-45 min; said introduction of CO2Control of CO when gas is present2The flow rate of the gas is 0.2-5L/min.
6. The method for preparing aluminum hydroxide by using the aluminum ash denitrification fluorine fixation clinker as claimed in claim 5, wherein the method comprises the following steps: the time of the carbonation decomposition reaction in the step c is 15-45 min; said introduction of CO2Control of CO when gas is present2The flow rate of the gas is 1-5L/min.
7. The method for preparing the aluminum hydroxide by using the aluminum ash denitrification fluorine fixation clinker as claimed in claim 1, which is characterized in that: and d, returning the sodium carbonate obtained in the step d as a medicament to the roasting process for recycling.
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| CN115072755A (en) * | 2022-06-15 | 2022-09-20 | 郑州大学 | Method for producing aluminum hydroxide without red mud |
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