CN107855105B - Method for preparing porous microspheres by using coal gasification fine slag and prepared porous microspheres - Google Patents
Method for preparing porous microspheres by using coal gasification fine slag and prepared porous microspheres Download PDFInfo
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
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- B01D24/001—Making filter elements not provided for elsewhere
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
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- B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
- B01J20/28057—Surface area, e.g. B.E.T specific surface area
- B01J20/28061—Surface area, e.g. B.E.T specific surface area being in the range 100-500 m2/g
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- B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
- B01J20/28069—Pore volume, e.g. total pore volume, mesopore volume, micropore volume
- B01J20/28073—Pore volume, e.g. total pore volume, mesopore volume, micropore volume being in the range 0.5-1.0 ml/g
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
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- B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
- B01J20/28078—Pore diameter
- B01J20/28083—Pore diameter being in the range 2-50 nm, i.e. mesopores
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- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/18—Carbon
Abstract
The invention discloses a method for preparing porous microbeads by acid dissolution of coal gasification fine slag, which comprises the following steps: a. taking a proper amount of coal gasification fine slag, and adding water to prepare coal gasification fine slag slurry with the solid content of 10-30 wt%; b. fully stirring the slurry prepared in the step a, and then collecting heavy separation products to obtain silicon-rich composite slurry through gravity cyclone separation; c. mixing a proper amount of acid solution with the silicon-rich composite slurry to obtain mixed slurry, and carrying out acid dissolution reaction; d. carrying out solid-liquid separation on the materials after the acid dissolution reaction, washing and drying to obtain a product; the invention also discloses the prepared composite porous material. The invention utilizes the high activity of the silicon-aluminum-calcium-iron in the coal gasification fine slag, regulates and controls the dissolution under mild conditions to obtain the porous material, the material has good physical and chemical adsorption performance, the preparation process is simple, the cost is low, the dissolved metal ions can be further used for preparing the water purifying agent, the comprehensive utilization of all components of the coal gasification slag is realized, and the waste is changed into valuable.
Description
Technical Field
The invention belongs to the technical field of solid waste resource utilization, and particularly relates to a method for preparing porous microbeads by acid dissolution of coal gasification fine slag and a prepared porous material.
Background
Coal gasification is one of the core contents of clean coal technology, and coal is incompletely oxidized to obtain combustible coal gasification gas (such as raw coal gas) which can be used downstream, and in recent years, coal gasification is rapidly becoming an important direction for coal resources and energy utilization. In recent 20 years, a batch of coal chemical enterprises have been built in Shanxi elm forest, inner Mongolia Erdos, Shanxi Changzhi, Xinjiang east, Yili and other places in China, the enterprises are put into production in succession, the yield is increased year by year, and clean comprehensive utilization of coal resources forms a certain scale in China.
In the coal gasification technology system, most of the carbonaceous part in the coal is converted into gas, and simultaneously, the inorganic mineral components associated with the raw coal, the added catalyst and the carbonaceous part remained after incomplete gasification are discharged in the form of residue (coal gasification slag). Depending on the discharge mode, the gasified slag is further divided into coarse slag and fine slag, where the coarse slag is a residue discharged through the bottom of the coal gasifier, and the fine slag is a residue entrained by the gasified coal gas and discharged separately in the purification process after the gasified coal gas leaves the coal gasifier. The yield of the coal gasification residues is increased rapidly along with the development of the coal chemical industry, and the coal gasification residues occupy land and pollute the environment during stacking, so that the coal gasification residues become new solid wastes which need to be solved urgently.
In recent years, there has been a growing interest around the use of coal slag to some scholars. CN 201510148929.3 discloses a light ceramsite prepared by utilizing fly ash and gasified slag, a preparation method and application thereof, and introduces a light ceramsite prepared by utilizing fly ash and gasified slag and a preparation method thereof; CN 201510420421.4 discloses a composition for producing filter ceramics, the filter ceramics, a preparation method and application thereof, and introduces a method for preparing the filter ceramics by using gasified slag as a main component; CN201310207509.9 discloses a method for realizing aluminum-iron-calcium separation by activating coal gasification ash, which introduces a method that coal gasification ash is dried, calcined at 700-1100 ℃ for 75 minutes and then quenched to obtain an activated material, and then the activated material is reacted with a hydrochloric acid solution or a sulfuric acid solution to realize the separation of aluminum, iron and calcium components, and the heat value of carbon residue in the coal gasification ash can be utilized; CN201210511610.9 discloses a method for treating gasified slag in coal chemical industry, which introduces the steps of uniformly mixing coal slime and gasified slag, adding white mud slurry, adopting a high-pressure pump pipeline conveying technology, conveying the mixture into a fluidized bed boiler which is hundreds of meters away, and realizing the reburning utilization of the gasified slag through a fluidized bed boiler combustion technology; the Yangshai and Shilijun, a Shenhua Ningxia coal industry group Limited liability company, published articles in coal chemical industry, 8 months in 2013, introduce the content and the loss on ignition of various oxide components in 3 kinds of coal gasification fine slag produced by the Shenhua Ningxia coal industry group Limited liability company, combine with national and industrial standards of comprehensive utilization of coal ash, perform feasibility analysis on the coal gasification fine slag used for cement, concrete, road bed mixed materials and the like, and provide suggestions for mixed combustion utilization and sorting utilization of the coal gasification fine slag; the Liu beam and the like summarize the utilization of the gasified slag at home and abroad, and are applied to sewage treatment, road building, baking-free bricks, cement, concrete and the like. From the recent data, people have recognized the hazard of gasified slag, and have begun to systematically study the composition structure and characteristics from different perspectives, and to pay attention to the disposal and utilization problems.
As for pore materials such as various synthetic zeolites, the porous materials are indispensable materials for adsorption, separation, catalysis, catalyst carriers and the like in the industries of modern chemical engineering, materials, energy and the like. The pore material may be classified into micro-pores, meso-pores and macro-pores according to the pore size. The raw material for synthesizing the siliceous pore material can be a chemical raw material or a natural mineral raw material with abundant reserves. In recent years, with increasing attention paid to utilization research of siliceous solid wastes such as fly ash and coal gangue, various reports have been continuously reported on the research results of synthesizing zeolite by using the solid wastes as raw materials. For example, the Sunhong et al (2008) adopt coal gangue to prepare a zeolite-activated carbon composite material; ZhonglinLi et al (2014) published research results on the synthesis of granular X-type zeolite/activated carbon composites by adding pitch and solid silica to coal gangue.
Up to now, zeolite pore materials have been synthesized by using natural raw materials or chemical reagents, mainly by hydrothermal synthesis in an alkaline environment, such as microporous, mesoporous, ordered, disordered, high-silicon or high-aluminum molecular sieves and mesoporous materials, and the like, which are of various varieties. The adoption of the artificial hydrothermal synthesis technology requires special hydrothermal synthesis equipment, the synthesis process conditions are harsh, a large amount of template agents are required to be added during the synthesis of the mesoporous material, and the template agents are removed through heat treatment at the later stage, so the synthesis cost is high, the process is complex, and the product price is high.
Disclosure of Invention
Compared with the traditional porous material, the microsphere porous material prepared by the invention does not need to undergo complicated processes such as hydrothermal synthesis and the like, and has simple preparation process and low cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for preparing porous microbeads through acid dissolution of coal gasification fine slag comprises the following steps:
a. taking a proper amount of coal gasification fine slag, and adding water to prepare coal gasification fine slag slurry with the solid content of 10-30 wt%;
b. fully stirring the slurry prepared in the step a, and then collecting heavy separation products to obtain silicon-rich composite slurry through gravity cyclone separation;
c. mixing a proper amount of acid solution with the silicon-rich composite slurry to obtain mixed slurry, and carrying out acid dissolution reaction;
d. and (3) carrying out solid-liquid separation on the materials after the acid dissolution reaction, washing and drying to obtain the product.
In the present invention, the coal gasification fine slag is a residue entrained by coal gasification gas and discharged in a purification process (for example, cyclone dust removal, bag dust removal and/or water washing) after the coal gasification gas leaves a coal gasification furnace, which is well known in the art, and it is understood by those skilled in the art that solid phase components are inevitably entrained in the coal gasification gas produced by coal gasification due to inorganic mineral components forming coal ash contained in the raw material coal and the presence of char remaining from incomplete gasification at the time of gasification, wherein the solid phase components with smaller particle size leave the gasification furnace to form coal gasification fine slag which is amorphous and has a particle size of usually less than 120 μm, such as 0.1-100 μm.
When the gasified fine slag is mixed with water to form slurry in step a of the present invention, it is understood by those skilled in the art that the gasified fine slag may be dry slag or wet slag, and the solid content of the slurry is 10wt% to 30 wt%, and more preferably 15 wt% to 25wt%, such as 20 wt%. In a preferred embodiment, the configured coal gasification fine slag slurry is subjected to a subsequent stirring treatment after at least 1h, such as 1.5h, 2h or 5h, so that the coal gasification fine slag is fully contacted and wetted with water, thereby facilitating subsequent cyclone separation.
In the step b, the slurry is stirred and then subjected to cyclone separation to obtain carbon-rich composite slurry; the stirring is a treatment means commonly used in the art, and for example, a stirring treatment may be performed by using a stirring device, and preferably, a stirring treatment may be performed by using a power-increasing stirrer. In a preferred embodiment, in the preparation process of the silicon-rich composite slurry, the stirring condition is that the stirring speed is not lower than 1500r/min, and the stirring time is not less than 30 min; preferably, the stirring speed is 1800-3000 r/min, and the stirring time is 60-180 min; to facilitate subsequent cyclonic separation. The research shows that the separation effect of the slurry after the soaking treatment is better particularly through the strong stirring. The cyclone separation is a common treatment means in the field, for example, a cyclone separator can be used for cyclone separation, in the cyclone separation, carbon components with lower density in fine slag mainly overflow from the top of the cyclone separator due to the action of gravity, and silicon-aluminum components with higher density (heavy separation products) are mainly discharged from the bottom, so that the separation is realized.
In step c, mixing a proper amount of acid water solution with the silicon-rich composite slurry to obtain mixed slurry so as to perform acid dissolution reaction; as the coal gasification fine slag is subjected to the process from high temperature (such as 1300-1400 ℃) to water quenching and quenching, the coal gasification fine slag has high chemical reaction activity, so that the metal oxide in the coal gasification fine slag can be dissolved out by reacting with acid, and the residual siliceous components form a disordered porous microbead state with different porosities according to the different dissolved amounts of metal ions, thereby obtaining the siliceous skeleton porous material. Preferably, in step c, the slurry obtained by mixing has a solid content of 10-35wt%, such as 12 wt%, 15 wt% or 20 wt%, the acid concentration (the acid mass in the slurry divided by the mass of the liquid phase in the slurry, i.e. the acid mass fraction in the liquid phase of the slurry) is 5-25wt%, such as 8wt% or 12 wt%, and the acid dissolution reaction is performed with stirring for 2-6h, which is beneficial to ensure the effect of the acid dissolution reaction. The acid solution may be an acid solution commonly used in the art to facilitate the dissolution of metal elements such as aluminum, calcium, iron and the like in the fine slag, and preferably, the acid solution is an aqueous solution of hydrochloric acid or nitric acid.
In step d of the invention, the solid-liquid separation is carried out on the material after the acid dissolution reaction, and the material is washed and dried; the above-mentioned processes are well known in the art, and for example, solid-liquid separation is carried out by filtration, and the solid is washed to have a pH of 4 or more; and drying the solid at 80-120 ℃ to obtain the acid-soluble regulation and control type porous material. Preferably, the carbon content in the product obtained in step d is not more than 10wt%, preferably not more than 8wt%, such as 5 to 8 wt%.
The liquid phase product obtained by the solid-liquid separation mainly contains metal ions such as aluminum, iron, calcium and the like, can be further used for preparing a water purifying agent, realizes comprehensive utilization and further improves the economic benefit, wherein the water purifying agent can be prepared by a method commonly used in the field, for example, a dissolution liquid contains aluminum chloride, iron chloride and calcium chloride, and the material can meet the requirement of the water purifying agent by simply adjusting the concentration of the aluminum chloride to 29 wt%.
In a preferred embodiment of the present invention, the method further comprises the step e: step e: and (d) calcining the product obtained in the step (d) to remove residual carbon, wherein the calcining temperature is 550-750 ℃, such as 600 or 650 ℃, so as to obtain the siliceous porous microbead material with good performance, which can be used as a catalyst carrier, a functional filler and the like.
The invention also provides the porous microbead material prepared by the method; preferably, the amount of silica in the porous microbead material is in the range of 60-95 wt%, such as 80 wt% or 90 wt%.
Compared with the prior art, the invention has the following advantages:
the invention can realize the development of high value-added products of the coal gasification fine slag, and the coal gasification fine slag is a mixture of amorphous silicon-aluminum substances (simultaneously containing calcium, iron and the like) and residual carbon, which are converted from high-temperature melting to water quenching and rapid cooling of inorganic minerals containing silicon, aluminum and the like in coal after the coal is gasified at high temperature. Different from the conventional fly ash, the obvious difference between the microbeads in the coal gasification fine slag and the microbeads in the fly ash is that the components of the coal gasification fine slag all exist in an amorphous state, the chemical activity is good, the contained metal oxides such as aluminum, calcium, iron and the like are easy to be dissolved out by reacting with acid at low temperature, and the dissolving-out degree of metal ions can be regulated and controlled by the using amount of the acid;
the micro-beads are dissolved by low-temperature acid, and after the aluminum, calcium and iron components in the micro-beads are dissolved out, loose and porous silicon glass micro-beads can be obtained, the porous micro-beads have large specific surface area, high pore volume, good thermal stability and high strength, can be used as adsorption, filtration, catalyst carriers or functional fillers and the like, so that the development of high value-added products of coal gasification slag solid waste is realized, the preparation process is simple, and the cost is low; meanwhile, the dissolved metal ions can be further used for preparing a water purifying agent, so that the comprehensive utilization of all components of the gasified slag is realized, and waste is changed into valuable.
Detailed Description
The present invention will be described in detail with reference to examples, but the present invention is not limited thereto.
In the following examples/comparative examples, the coal gasification fine slag used was from the industry park of Touguese, Orificial, with the following properties/combinations: carbon content 40.2 wt%, silica 20.1 wt%; 10.9 wt% of alumina, 12.4 wt% of calcium oxide and 5.3 wt% of iron oxide.
In the following examples, the reagents used were analytically pure unless otherwise specified.
Example 1
Weighing 100g of coal gasification fine slag, adding water to dilute the coal gasification fine slag until the solid content is 10wt%, and stirring the coal gasification fine slag by a high-speed dispersion stirrer (Guangdong Foshan Yifu mechanical Co., Ltd.) at normal temperature, wherein the stirring speed is 1800r/min and the stirring time is 30 min; introducing the slurry into a cyclone separator for separation to obtain lower slurry which is silicon-rich composite slurry, and separating out solid components, wherein the total solid content is about 60g, and the carbon content is about 6 wt%;
adding 130ml of 36 wt% concentrated hydrochloric acid into the solid components, adding water to adjust the total volume of the slurry to 360ml, stirring the slurry at normal temperature for 6h, and then adding concentrated hydrochloric acid with the concentration of about 15.6 wt% and the solid content of about 14.5 wt% into the slurrySolid-liquid separation, washing with water until the pH is equal to 4; the separated mixed solution of calcium chloride, aluminum chloride and ferric chloride can be used for the development of a polyaluminum ferric chloride water purifying agent product; and drying the separated solid at 100 ℃ to obtain the carbon-silicon composite porous material. Under the condition, the dissolution rate of the obtained product alumina is 88 percent, the dissolution rate of calcium oxide is 93 percent, and the dissolution rate of ferric oxide is 91 percent; the specific surface area was determined to be 390m2Per g, pore volume of 0.6748cm3(ii) in terms of/g. The aperture is 3.54 nm.
Performing heat treatment on the composite porous material at 580 ℃ for 3h to remove carbon to obtain a siliceous glass microsphere porous material, and measuring the specific surface area of the siliceous glass microsphere porous material to be 289m2Per g, pore volume of 0.5426cm3(ii)/g, pore diameter is 3.48 nm.
Example 2
Weighing 100g of coal gasification fine slag, adding water to dilute the coal gasification fine slag until the solid content is 10wt%, and stirring the coal gasification fine slag by a high-speed dispersion stirrer (Guangdong Fushan Yifu mechanical Co., Ltd.) at normal temperature at the stirring speed of 1600r/min for 40 min; introducing the slurry into a cyclone separator for separation to obtain lower slurry which is silicon-rich composite slurry, wherein the total amount of separated solid components is about 60g, and the carbon content is about 6 wt%;
taking 100ml of 36 wt% concentrated hydrochloric acid, adding water to dilute the concentrated hydrochloric acid to 130ml, adding the diluted concentrated hydrochloric acid to the solid component, adding water to adjust the total volume of slurry to 360ml, wherein the acid concentration of the slurry is about 12.2 wt%, the solid content is about 14.7 wt%, stirring the slurry at normal temperature for 4 hours, then carrying out solid-liquid separation, washing the slurry until the pH value is equal to 4, and using the separated calcium chloride, aluminum chloride and ferric chloride mixed solution for developing a polyaluminum ferric chloride water purifying agent product; the separated solid is dried at 100 ℃, and the obtained product is a novel porous material compounded by porous silicon microbeads and porous carbon. The dissolution rate of the product alumina obtained under the condition is 74%, the dissolution rate of the calcium oxide is 81% and the dissolution rate of the ferric oxide is 69%; the specific surface area was measured to be 342m2Per g, pore volume of 0.531cm3(ii)/g, pore diameter is 3.59 nm.
Performing heat treatment on the composite porous material for 3h at 600 ℃ to remove carbon to obtain a siliceous glass bead porous material, and measuring the specific surface area of the siliceous glass bead porous material to be 238m2Per g, pore volume of 0.4919cm3(ii) in terms of/g. The aperture is 2.97 nm.
Example 3
Weighing 100g of coal gasification fine slag, adding water to dilute the coal gasification fine slag until the solid content is 10wt%, and stirring the coal gasification fine slag by a high-speed dispersion stirrer (Guangdong Fushan Yifu mechanical Co., Ltd.) at normal temperature, wherein the stirring speed is 1700r/min and the stirring time is 30 min; introducing the slurry into a cyclone separator for separation to obtain lower slurry which is silicon-rich composite slurry, wherein the total amount of separated solid components is about 62g, and the carbon content is about 6.5 wt%;
adding 75ml of 36 wt% concentrated hydrochloric acid into water to be diluted to 130ml, adding the diluted solution into the solid component, adding water to adjust the total volume of the slurry to be 360ml, wherein the acid concentration of the slurry is about 9.3 wt% and the solid content is about 15.3 wt%, stirring the solution at normal temperature for 4h, then carrying out solid-liquid separation, washing the solution until the pH value is equal to 4, and using the separated calcium chloride, aluminum chloride and ferric chloride mixed solution for developing a polyaluminum ferric chloride water purifying agent product; the separated solid is dried at 100 ℃, and the obtained product is a novel porous material compounded by porous silicon microbeads and porous carbon. Under the condition, the dissolution rate of the obtained product alumina is 53 percent, the dissolution rate of calcium oxide is 67 percent, and the dissolution rate of ferric oxide is 55 percent; the specific surface area was determined to be 309m2Per g, pore volume of 0.4541cm3(ii)/g, pore diameter is 3.18 nm.
Performing heat treatment on the composite porous material for 3 hours at 600 ℃ to remove carbon to obtain a siliceous glass bead porous material, and measuring the specific surface area of the siliceous glass bead porous material to be 198m2Per g, pore volume of 0.3982cm3(ii)/g, pore diameter 2.19 nm.
Example 4
Weighing 100g of coal gasification fine slag (containing 50 wt% of water), adding water to dilute the coal gasification fine slag until the solid content is 10wt%, and stirring the coal gasification fine slag by a high-speed dispersion stirrer (Guangdong Fushan Yifu mechanical Co., Ltd.) at normal temperature at the stirring speed of 1600r/min for 40 min; introducing the slurry into a cyclone separator for separation to obtain lower slurry which is silicon-rich composite slurry, wherein the total amount of separated solid components is about 60g, and the carbon content is about 6 wt%;
adding water into 28ml of 70 wt% concentrated nitric acid to dilute the nitric acid to 130ml, adding the nitric acid into the solid component, adding water to adjust the total volume of the slurry to 360ml, wherein the nitric acid concentration of the slurry is about 7.25 wt%, and the solid content of the slurry is about 14.8 percent, stirring for 4 hours at normal temperature, then carrying out solid-liquid separation, washing with water until the pH value is equal to 4, and drying the separated solid at 100 ℃ to obtain the product which is the novel porous material compounded by the porous siliceous microbeads and the porous carbon. Under the condition, the dissolution rate of the obtained product alumina is 90%, the dissolution rate of calcium oxide is 95% and the dissolution rate of ferric oxide is 93%; the specific surface area was measured to be 410m2Per g, pore volume of 0.6925cm3(ii) in terms of/g. The aperture is 3.50 nm.
Performing heat treatment on the composite porous material for 3h at 600 ℃ to remove carbon to obtain a siliceous glass bead porous material, and measuring the specific surface area of the siliceous glass bead porous material to be 295m2Per g, pore volume of 0.5523cm3Per g, pore size 3.46 nm.
Claims (8)
1. A method for preparing porous microbeads through acid dissolution of coal gasification fine slag comprises the following steps:
a. taking a proper amount of coal gasification fine slag, and adding water to prepare coal gasification fine slag slurry with the solid content of 10-30 wt%;
b. fully stirring the slurry prepared in the step a, and then collecting heavy separation products to obtain silicon-rich composite slurry through gravity cyclone separation; in the step b, stirring conditions are that the stirring speed is not lower than 1500r/min, and the stirring time is not less than 30 min;
c. mixing a proper amount of acid solution with the silicon-rich composite slurry to obtain mixed slurry, and carrying out acid dissolution reaction; wherein the solid content in the obtained mixed slurry is 10-35wt%, the acid concentration is 5-25wt%, and the mixed slurry is stirred for 2-6h to carry out acid dissolution reaction;
d. carrying out solid-liquid separation on the materials after the acid dissolution reaction, washing and drying to obtain a product;
the method further comprises step e: and (e) calcining the product obtained in the step (d) to remove residual carbon, wherein the calcining temperature is 550-750 ℃.
2. The process of claim 1 wherein the carbon content of the product of step d is no greater than 10 wt%.
3. The method of claim 2, wherein the carbon content of the product obtained in step d is 5-8 wt%.
4. The method according to any one of claims 1 to 3, wherein the stirring speed is 1800 to 3000r/min and the stirring time is 40 to 180 min.
5. The method according to claim 1, characterized in that the coal gasification fine slag slurry prepared in the step a is stirred for at least 1h before being subjected to the stirring treatment in the step b.
6. The method of any one of claims 1-3 and 5, wherein the acid solution is an aqueous hydrochloric acid or nitric acid solution.
7. The method according to any one of claims 1 to 3 and 5, wherein the acidic aqueous solution obtained by the solid-liquid separation is further used to prepare a water purifying agent.
8. A porous microbead material prepared according to the method of any of claims 1-7.
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| CN108585779B (en) * | 2018-05-04 | 2021-10-15 | 中国科学院过程工程研究所 | Method for preparing aluminum-silicon composite material by using gasified slag |
| CN110452012A (en) * | 2019-08-23 | 2019-11-15 | 成都德菲环境工程有限公司 | A kind of method that gangue cooperates with resource utilization to prepare haydite with coal gas slugging |
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