CN110577231A - method for extracting aluminum oxide and coproducing silicon oxide and ferric oxide from fly ash - Google Patents
method for extracting aluminum oxide and coproducing silicon oxide and ferric oxide from fly ash Download PDFInfo
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- CN110577231A CN110577231A CN201910843755.0A CN201910843755A CN110577231A CN 110577231 A CN110577231 A CN 110577231A CN 201910843755 A CN201910843755 A CN 201910843755A CN 110577231 A CN110577231 A CN 110577231A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
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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
- C01F7/44—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water
- C01F7/441—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water by calcination
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- 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
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- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/02—Oxides; Hydroxides
- C01G49/06—Ferric oxide (Fe2O3)
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- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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Abstract
the invention relates to a comprehensive development and utilization technology of fly ash, in particular to a method for extracting aluminum oxide and co-producing silicon oxide and ferric oxide from fly ash. Reacting fly ash with hydrochloric acid, filtering to obtain precipitate containing SiO2, adjusting pH of the filtrate with sodium hydroxide, separating out soluble sodium metaaluminate, precipitating out aluminum hydroxide with hydrochloric acid, and calcining to obtain aluminum oxide. Dissolving silicon oxide with alkali, precipitating with hydrochloric acid, and oven drying. The iron oxide is prepared by roasting iron hydroxide. The invention only needs 10-22% of aluminum oxide, 45-55% of silicon oxide and 10-22% of ferric oxide to meet the requirements of the content of chemical components in the fly ash, and has the process characteristics of low solvent concentration, low energy consumption, high extraction rate of aluminum oxide, simple process flow, low production cost, no requirement of high-alumina fly ash for raw materials, simultaneous extraction of various useful substances, zero emission of process wastes, no production of toxic gases and no secondary pollution to the environment.
Description
Technical Field
The invention relates to a comprehensive development and utilization technology of fly ash, in particular to a method for extracting aluminum oxide and co-producing silicon oxide and ferric oxide from fly ash.
Background
the fly ash is a solid waste discharged from the bottom of a boiler and a flue at the tail of the boiler in a coal-fired power plant, is the industrial solid waste with the largest discharge in the world at present, and the accumulated fly ash causes serious pollution to the atmosphere, water, soil and the like due to the lack of effective recycling measures. After the fly ash is accumulated in an ash factory for a long time, harmful components such as trace elements, heavy metals and radioactive elements in the fly ash are migrated and diffused, soil, earth surface and underground water are polluted, even the harmful components are transferred to crops, the health of people and animals is harmed, and a large amount of land resources are occupied.
the main chemical components of the fly ash are Al2O3, SiO2, Fe2O3, CaO, TiO2, C and other various trace elements. The mass fractions of Al2O3 and SiO2 in the fly ash can reach more than 80 percent, so that the research on the comprehensive utilization of the fly ash is developed, alumina, silicon dioxide and ferric oxide are extracted from the fly ash to realize the recycling of the fly ash, the comprehensive utilization value of the fly ash can be improved, and the method has great significance for protecting land resources, reducing or eliminating environmental pollution and realizing circular economy.
chinese patent CN 101041450B, "a clean production process for preparing alumina and white carbon black by using high-alumina fly ash", takes sodium carbonate as a material, decomposes the high-alumina fly ash at a medium temperature to generate an acid-soluble aluminosilicate material; acid leaching the sintering material with dilute sulfuric acid to separate alumina and silica in the high-alumina fly ash; the obtained aluminum-containing liquid part is further processed to generate aluminum hydroxide precipitate, the aluminum hydroxide precipitate is calcined to prepare aluminum oxide, and the silica-containing colloidal part is purified, washed, dried and calcined to prepare inorganic silicon compound products such as white carbon black, silica aerogel, superfine silica, porous silica and the like; chinese patent CN 103058239B, "a method for extracting alumina and white carbon black from fly ash", adopts the steps of sodium hydroxide leaching amorphous silica, carbonation separation of silicic acid, sodium carbonate recovery, residue sintering, hydrochloric acid leaching alumina and separation of silicic acid, etc., so as to realize the extraction of silica and alumina from fly ash for producing white carbon black and alumina; chinese patent CN 101759210B, "a method for extracting high-purity alumina and silica gel from fly ash", realizes the purpose of obtaining high-purity alumina and silica gel from fly ash by adopting the steps of circular activation, leaching, carbon separation, sodium carbonate and water recovery, silicon-aluminum separation, pyrolysis, hydrochloric acid recovery and the like; similarly, chinese patent CN 101254933B "method for extracting high purity alumina and silica gel from fly ash" is also included, and the above-mentioned processes can make the extraction rate of alumina and silica in fly ash reach above 90%, but these methods are limited by chemical conditions, and the consumption of acid and alkali is very large, and they cannot be recycled, and the cost of raw materials is very high, so that these techniques are difficult to industrialize.
Chinese patent CN 103663516B, "a method for preparing aluminum hydroxide by using high-alumina fly ash", discloses a method for preparing aluminum hydroxide by using high-alumina fly ash, which adopts deep desiliconization and two-step molten salt dissolution processes, can realize the full utilization of aluminum and silicon components in fly ash, but has the disadvantages of complex process flow, difficult operation, two-step pre-desiliconization treatment, acid activation, difficult recycling of pickling solution, easy environmental pollution, harsh reaction conditions and high energy consumption.
the invention aims to solve the technical problem of providing a method for extracting aluminum oxide and coproducing silicon dioxide and ferric oxide from fly ash, wherein the method only needs 10-22% of aluminum oxide, 45-55% of silicon oxide and 10-22% of ferric oxide according to the requirements on the content of chemical components in the fly ash.
Disclosure of Invention
In order to solve the technical problems in the background art, the technical scheme of the method for extracting aluminum oxide and coproducing silicon oxide and ferric oxide from fly ash is as follows:
a method for extracting aluminum oxide and coproducing silicon oxide and ferric oxide from fly ash is characterized by comprising the following steps:
(1) Mixing the fly ash with 20% hydrochloric acid according to the mass ratio of 1: 6. Placing the mixed solution in a flask, then immersing the flask in a water bath at 95 ℃, inserting a stirrer into the flask containing the mixed solution, stirring for 2 hours at a stirring speed of 250rpm, and separating a filtrate and a solid residue by using a filter for later use;
(2) Adjusting the pH value of the filtrate obtained in the step (1) to 12 by using a sodium hydroxide solution with the concentration of 8mol/L, filtering and separating the filtrate by using a filter, reserving a solid residue after filtration, adjusting the pH value of the filtrate containing NaAlO2 to 5.4 by using hydrochloric acid with the concentration of 20%, filtering and separating the filtrate by using the filter, drying the separated Al (OH)3 at 110 ℃ for 2 hours, and roasting to obtain the gamma-Al 2O 3.
(3) the SiO contained in the step (1)2The separation filtration residue and a sodium hydroxide solution with a concentration of 8mol/L are mixed according to a mass ratio of 1:9The mixed solution was placed in a flask, and the flask was placed in a 75 ℃ water bath and stirred at a stirring speed of 200rpm for 2 hours. Then filtering and separating the solution by a filter, adjusting the pH of the filtered solution to 1 by using a hydrochloric acid solution with the concentration of 20%, and drying the filtered solid at 110 ℃ for 2 hours to obtain silicon dioxide;
(4) Washing the residue filtered in the step (2) with distilled water, and roasting at 1000 ℃ for 2 hours at the heating rate of 3 ℃/min to prepare the iron oxide.
Further, in the present invention,
the mass ratio of the fly ash and the hydrochloric acid solution in the step (1) is 1: 6.
Further, in the present invention,
In the step (1), the mixed solution was placed in a flask, the flask was then immersed in a water bath at 95 ℃, and a stirrer was inserted into the flask containing the mixed solution and stirred at a stirring speed of 250rpm for 2 hours.
further, in the present invention,
And (2) adjusting the pH value to 12 by adopting a sodium hydroxide solution with the concentration of 8 mol/L.
Further, in the present invention,
And (3) roasting in the step (2) at the temperature rise rate of 2 ℃/min and the roasting temperature of 800 ℃ for 2 hours to obtain the gamma-Al 2O 3.
Further, in the present invention,
The iron oxide prepared in the step (4) can be used for preparing an iron catalyst for the advanced treatment of biochemical sewage or the prepared iron oxide pigment is widely applied to the fields of color cement floor tiles, color cement and water-based color paste.
Further, in the present invention,
The alumina prepared in the step (2) can be used as a catalyst, an adsorbent, a catalyst carrier or a refractory material and the like, and the alumina can be used as the adsorbent for column chromatography; the alumina can be used as a dehydrating agent for preparing olefin by dehydrating alcohol, and can be used as a catalyst carrier for esterification catalytic reaction of alumina loaded Lewis base.
further, in the present invention,
The silicon dioxide prepared in the step (3) can be used for manufacturing plate glass, glass products, casting sand, glass fiber, ceramic colored glaze, sand blasting for rust prevention, sand for filtration, flux, refractory materials, light-weight bubble concrete and the like.
Further, in the present invention,
The fly ash comprises the following chemical components in percentage by mass: 10-22% of aluminum oxide, 45-55% of silicon oxide and 10-12% of ferric oxide.
preferably, the first and second liquid crystal materials are,
a method for extracting aluminum oxide and coproducing silicon oxide and iron oxide from fly ash is characterized by comprising the following steps:
(1) The chemical components are respectively as follows by mass percent: 10-22% of aluminum oxide, 45-55% of silicon oxide, 10-22% of ferric oxide and 20% hydrochloric acid solution are mixed according to the mass ratio of 1: 6. Placing the mixed solution in a flask, then immersing the flask in a water bath at 95 ℃, inserting a stirrer into the flask containing the mixed solution, stirring for 2 hours at a stirring speed of 250rpm, and separating a filtrate and a solid residue by using a filter for later use;
(4) Adjusting the pH value of the filtrate obtained in the step (1) to 12 by using a sodium hydroxide solution with the concentration of 8mol/L, filtering and separating the filtrate through a filter, reserving solid residues after filtering, adjusting the pH value of the filtrate containing NaAlO2 to 5.4 by using hydrochloric acid with the concentration of 20%, filtering and separating the filtrate through the filter, drying the separated Al (OH)3 at 110 ℃ for 2 hours, and roasting the dried Al (OH)3 to obtain gamma-Al 2O3, wherein the roasting temperature is 800 ℃, the roasting temperature rise rate is 2 ℃/min, and the roasting time is 2 hours;
(5) the SiO contained in the step (1)2the separation filtration residue and the sodium hydroxide solution having a concentration of 8mol/L were mixed at a mass ratio of 1:9, the mixed solution was placed in a flask, and the flask was stirred in a 75 ℃ water bath at a stirring speed of 200rpm for 2 hours. Then filtering and separating the solution by a filter, adjusting the pH of the filtered solution to 1 by using a hydrochloric acid solution with the concentration of 20%, and drying the filtered solid at 110 ℃ for 2 hours to obtain silicon dioxide;
(6) washing the residue filtered in the step (2) with distilled water, and roasting at 1000 ℃ for 2 hours at the heating rate of 3 ℃/min to prepare the iron oxide.
The invention adopts acid-base combination method to prepare alumina, the fly ash reacts with hydrochloric acid, precipitate containing SiO2 is filtered, the pH of the filtrate is adjusted by sodium hydroxide, hydroxide of iron and the like is removed by filtration, soluble sodium metaaluminate is separated, aluminum hydroxide is precipitated by hydrochloric acid, and the alumina is prepared by roasting.
The main chemical reactions for preparing the alumina are as follows:
Al2O3+6HCl＝2AlCl3+3H2O
AlCl3+4NaOH＝3NaCl+NaAlO2+2H2O
NaAlO2+HCl+H2O＝NaCl+Al(OH)3↓
2Al(OH)3＝Al2O3+2H2O
The low temperature of the Al (OH)3 roasting process is mostly gamma-Al 2O3, the temperature is 1100-1200 ℃ to become alpha-Al 2O3, and the alumina with different crystal forms can be prepared by controlling the roasting temperature.
the acid soluble part of the fly ash is fully dissolved by using excessive hydrochloric acid in the reaction process, and the pH is adjusted by using sodium hydroxide, so that aluminum exists in the form of NaAlO2, and iron becomes precipitated Fe (OH)3, and the pH is preferably adjusted to 12.
The process reaction for extracting the SiO2 is as follows:
The silica reacts with sodium hydroxide to produce sodium silicate and water.
SiO2+2NaOH＝Na2SiO3+H2O
Then filtering the sodium silicate solution, and adding hydrochloric acid to generate silicon dioxide SiO 2.
Na2SiO3+2HCl＝SiO2↓+2NaCl+H2O
The main reactions for preparing iron oxide are:
FeCl3+3NaOH＝Fe(OH)3↓
And then the iron oxide is prepared by high-temperature roasting, and the iron oxide after high-temperature roasting can be used as a high-grade grinding material, such as a polishing grinding material.
The prepared silicon dioxide can produce silicon carbide, and the reaction equation is as follows:
SiO2+2C＝SiC+CO2↑
Silicon carbide can be used as functional ceramics, advanced refractories, abrasives and metallurgical raw materials.
The invention adopts low-speed stirring, and the reaction and the precipitation are carried out for a certain time. The reactants can be fully reacted and completely precipitated, and the yield of the product can be improved.
The final product refined by the method has high yield which is respectively as follows: 84-88% of aluminum oxide, 96-98% of silicon oxide and 96-99% of ferric oxide, wherein the purity of the final product is high, the aluminum oxide is more than or equal to 90%, the silicon oxide is more than or equal to 99%, and the ferric oxide is more than or equal to 90%.
the specific process flow is shown in figure 1.
Advantageous effects of the invention
1. The fly ash raw material has wide application range, low requirement on production equipment and low initial investment of technology.
2. the technology of the invention is not only suitable for refining high-alumina fly ash, but also suitable for refining low-alumina fly ash, and the yield of alumina is high.
3. The technology of the invention not only provides a method for efficiently refining alumina, but also provides a method for refining silicon oxide and ferric oxide.
4. the alumina refined by the technology of the invention not only replaces aluminum ore, but also can be widely applied to catalysts, adsorbents, dehydrating agents, catalyst carriers, refractory materials and the like.
5. The method has the advantages of low solvent concentration, low energy consumption, high alumina extraction rate, simple process flow, no requirement of high-alumina fly ash for raw materials, simultaneous extraction of various useful substances, zero emission of process wastes, avoidance of production of toxic gases and no secondary pollution to the environment.
6. The invention is an acid-base-coupling process. The method has the advantages of low solvent concentration, low energy consumption and high alumina extraction rate, and can realize zero emission of wastes in the process of extracting silicon oxide and iron oxide, thereby avoiding the problems of high-alumina fly ash as raw materials, complex process flow, high production cost, secondary pollution such as toxic gas generation and the like in the prior art.
7. The technology of the invention not only provides a method for efficiently refining alumina, but also provides a method for refining silicon oxide and ferric oxide; the extraction yield of the final product is high: alumina is more than or equal to 84 percent, silicon oxide is more than or equal to 96 percent, ferric oxide is more than or equal to 96 percent, and the purity of the final product is high; more than or equal to 90 percent of aluminum oxide, more than or equal to 99 percent of silicon oxide and more than or equal to 90 percent of ferric oxide.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
before the present embodiments are further described, it is to be understood that the scope of the invention is not limited to the particular embodiments described below; it is also to be understood that the terminology used in the examples is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention.
When numerical ranges are given in the examples, it is understood that both endpoints of each of the numerical ranges and any value therebetween can be selected unless the invention otherwise indicated. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition to the specific methods, devices, and materials used in the examples, any methods, devices, and materials similar or equivalent to those described in the examples may be used in the practice of the invention in addition to the specific methods, devices, and materials used in the examples, in keeping with the knowledge of one skilled in the art and with the description of the invention.
example 1
(1) Mixing the fly ash with 20% hydrochloric acid according to the mass ratio of 1: 6.
placing the mixed solution in a flask, then immersing the flask in a water bath at 95 ℃, inserting a stirrer into the flask containing the mixed solution, stirring for 2 hours at a stirring speed of 250rpm, and separating a filtrate and a solid residue by using a filter for later use;
(2) adjusting pH of the filtrate obtained in step (1) to 12 with 8mol/L sodium hydroxide solution, filtering and separating with filter to obtain solid residue, adjusting pH of the filtrate containing NaAlO2 to 5.4 with 20% hydrochloric acid, filtering and separating with filter to obtain Al (OH)3Drying at 110 ℃ for 2 hours, and then roasting to obtain gamma-Al 2O3, wherein the roasting temperature is 800 ℃, the roasting temperature rise rate is 2 ℃/min, and the roasting time is 2 hours;
(3) The SiO contained in the step (1)2The separation filtration residue and the sodium hydroxide solution having a concentration of 8mol/L were mixed at a mass ratio of 1:9, the mixed solution was placed in a flask, and the flask was stirred in a 75 ℃ water bath at a stirring speed of 200rpm for 2 hours. Then filtering and separating through a filter, adjusting the pH value of the filtered solution to 1 by using a hydrochloric acid solution with the concentration of 20%, and drying the filtered solid at 110 ℃ for 2 hours to obtain silicon dioxide;
(4) Washing the residue filtered in the step (2) with distilled water, and roasting at 1000 ℃ for 2 hours at the heating rate of 3 ℃/min to prepare the iron oxide.
Finally, it is noted that the above-mentioned embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (10)
1. A method for extracting aluminum oxide and coproducing silicon oxide and ferric oxide from fly ash is characterized by comprising the following steps:
(1) Mixing fly ash and 20% hydrochloric acid according to a mass ratio of 1: 6. Placing the mixed solution into a flask, then immersing the flask into a water bath, mixing and stirring the mixed solution by a stirrer, and then separating filtrate and solid residue by a filter for later use;
(2) adjusting pH of the solution filtered in step (1) to 12 with 8mol/L sodium hydroxide solution, filtering with filter, and separating solid residue containing NaAlO2the pH of the filtrate was adjusted to 5.4 with a 20% hydrochloric acid solution, and the filtrate was separated by filtration through a filter, and the separated Al (OH) was added3drying at 110 ℃ for 2 hours, and then roasting to obtain gamma-Al2O3(ii) a Wherein the roasting temperature is 800 ℃, and the roasting temperature rise rate is 2 ℃/min;
(3) The SiO contained in the step (1)2Mixing the separation and filtration residue and a sodium hydroxide solution with the concentration of 8mol/L according to the mass ratio of 1:9, placing the mixed solution into a flask, placing the flask into a water bath with the temperature of 75 ℃ for stirring, and stirring for 2 hours at the stirring speed of 200 rpm; then filtering and separating through a filter, adjusting the pH value of the filtered solution to 1 by using hydrochloric acid with the concentration of 20%, and drying the filtered solid at 110 ℃ for 2 hours to obtain silicon dioxide;
(4) Washing the residue filtered in the step (2) with distilled water, roasting for 2 hours at the temperature of 1000 ℃, and heating at the rate of 3 ℃/min to obtain the iron oxide.
2. the method for extracting aluminum oxide and coproducing silicon oxide and iron oxide from fly ash as claimed in claim 1, wherein the mass ratio of the fly ash and hydrochloric acid in the step (1) is 1: 6.
3. The method for extracting aluminum oxide and coproducing silicon oxide and iron oxide from fly ash as claimed in claim 1, wherein in the step (1), the mixed solution is placed in a flask, then the flask is immersed in a water bath at 95 ℃ for reaction, and a stirrer is inserted into the flask containing the mixed solution and stirred for 2 hours at a stirring speed of 250 rpm.
4. the method for extracting aluminum oxide and coproducing silicon oxide and iron oxide from fly ash as claimed in claim 1, wherein the pH value in the step (2) is adjusted to 12 by using sodium hydroxide with a concentration of 8 mol/L.
5. The method for extracting aluminum oxide and co-producing silicon oxide and iron oxide from fly ash as claimed in claim 1, wherein in the step (2), the roasting temperature is 800 ℃, the heating rate is 2 ℃/min, and the gamma-Al 2O3 is prepared by roasting for 2 hours.
6. The method for extracting aluminum oxide and coproducing silicon oxide and iron oxide from fly ash as claimed in claim 1, wherein the iron oxide obtained in step (4) can be used for preparing iron catalyst for advanced treatment of biochemical sewage or the prepared iron oxide pigment can be widely applied to the fields of color cement floor tiles, color cement and water-based color paste.
7. The method for extracting alumina and coproducing silica and iron oxide from fly ash according to claim 1, wherein the alumina obtained in step (2) can be used as a catalyst, an adsorbent, a catalyst carrier, a refractory material or the like.
8. The method for extracting alumina and coproducing silica and iron oxide from fly ash as claimed in claim 1, wherein the silica obtained in step (5) can be used for manufacturing plate glass, glass products, casting sand, glass fiber, ceramic colored glaze, rust-proof sand blasting, filtering sand, flux, refractory material, lightweight bubble concrete and the like.
9. The method for extracting aluminum oxide and coproducing silicon oxide and iron oxide from fly ash as claimed in claims 1-4, wherein the fly ash comprises the following chemical components in percentage by mass:
10-22% of aluminum oxide, 45-55% of silicon oxide and 10-22% of ferric oxide.
10. the method for extracting aluminum oxide and coproducing silicon oxide and iron oxide from fly ash as claimed in claim 1, wherein the preparation method comprises the following steps:
(1) The chemical components are respectively as follows by mass percent: 10-22% of alumina, 45-55% of silicon oxide and 10-22% of ferric oxide are mixed by hydrochloric acid with the concentration of 20% according to the mass ratio of 1: 6. Placing the mixed solution in a flask, then immersing the flask in a water bath at 95 ℃, inserting a stirrer into the flask containing the mixed solution, stirring for 2 hours at a stirring speed of 250rpm, and separating a filtrate and a solid residue by using a filter for later use;
(2) adjusting pH of the filtrate obtained in step (1) to 12 with 8mol/L sodium hydroxide solution, filtering and separating with filter to obtain solid residue, adjusting pH of the filtrate containing NaAlO2 to 5.4 with 20% hydrochloric acid, filtering and separating with filter to obtain Al (OH)3Drying at 110 ℃ for 2 hours, and then roasting to obtain gamma-Al 2O3, wherein the roasting temperature is 800 ℃, the roasting temperature rise rate is 2 ℃/min, and the roasting time is 2 hours;
(3) The SiO contained in the step (1)2the separation filtration residue and the sodium hydroxide solution having a concentration of 8mol/L were mixed at a mass ratio of 1:9, the mixed solution was placed in a flask, and the flask was stirred in a 75 ℃ water bath at a stirring speed of 200rpm for 2 hours. Then filtering and separating through a filter, adjusting the pH value of the filtered solution to 1 by using a hydrochloric acid solution with the concentration of 20%, and drying the filtered solid at 110 ℃ for 2 hours to obtain silicon dioxide;
(4) Washing the residue filtered in the step (2) with distilled water, and roasting at 1000 ℃ for 2 hours at the heating rate of 3 ℃/min to prepare the iron oxide.
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| CN111252774A (en) * | 2020-01-19 | 2020-06-09 | 刘文治 | Method for producing silica sol by using desulfurized gypsum and fly ash through treating waste with waste |
| CN111392729A (en) * | 2020-03-25 | 2020-07-10 | 昆明理工大学 | Method for carbothermic reduction of mixture of alumina and silica |
| CN111392729B (en) * | 2020-03-25 | 2022-06-07 | 昆明理工大学 | Method for carbothermic reduction of mixture of alumina and silica |
| CN113371745A (en) * | 2021-04-21 | 2021-09-10 | 上海电力大学 | System and method for producing high-purity alumina by recycling fly ash |
| CN113371745B (en) * | 2021-04-21 | 2024-03-29 | 上海电力大学 | System and method for producing high-purity alumina by recycling fly ash |
| CN115571864A (en) * | 2022-09-05 | 2023-01-06 | 六盘水师范学院 | Method for preparing battery-grade iron phosphate by using high-iron type fly ash as raw material |
| CN115709998A (en) * | 2022-11-14 | 2023-02-24 | 国能龙源环保有限公司 | Method for preparing white carbon black by roasting waste wind power blades |
| CN115709998B (en) * | 2022-11-14 | 2023-03-31 | 国能龙源环保有限公司 | Method for preparing white carbon black by roasting waste wind power blades |
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