CN103803564B - Take residue of aluminum-extracted pulverized fuel ash as method and the fine silica powder that fine silica powder prepared by raw material - Google Patents
Take residue of aluminum-extracted pulverized fuel ash as method and the fine silica powder that fine silica powder prepared by raw material Download PDFInfo
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Abstract
The invention discloses a kind of method and the fine silica powder that take residue of aluminum-extracted pulverized fuel ash as raw material and prepare fine silica powder.Should be with residue of aluminum-extracted pulverized fuel ash that the method that fine silica powder prepared by raw material comprises: S1, sodium hydroxide to be mixed with residue of aluminum-extracted pulverized fuel ash, and calcine, obtain calcined material; S2, in calcined material, add hydrochloric acid, after reaction, to filter and dry, obtain fine silica powder.By sodium hydroxide and residue of aluminum-extracted pulverized fuel ash mixed calcining, water glass and sodium metaaluminate can be formed.Meanwhile, in residue of aluminum-extracted pulverized fuel ash, other carbonaceous material also can change carbonic acid gas into and is removed.Add hydrochloric acid in calcined material after, reaction generates aluminum chloride, sodium-chlor soluble salt and precipitation of silica, and this just makes silicon-dioxide be separated.After filtration and dry, the fine silica powder that purity is higher can be obtained.This method, technological operation is simple, and the operational cycle is shorter, is applicable to the remanufacture of extensive fine silica powder.
Description
Technical field
The present invention relates to silicon-dioxide preparation field, in particular to a kind of be method and the fine silica powder that fine silica powder prepared by raw material with residue of aluminum-extracted pulverized fuel ash.
Background technology
Fine silica powder is as use a kind of powder material widely, the premium properties such as have that temperature tolerance is good, acid-alkali-corrosive-resisting, size-grade distribution are controlled, high insulation, low bulk, stable chemical performance, hardness are large, is widely used in the fields such as special cermacis, chemical industry, electronics, plastics, senior paint, rubber, national defence.After entering the nineties in 20th century, China's electronic industry obtains develop rapidly, and circuit card industry size has risen and occupied the whole world the second, and has participated among world's competition.Thus the demand of fine silica powder goods is surged.Although China's quartz reserves enrich, to production that is high-purity, ultra-pure, super-fine silicon micro-powder, be still in the starting stage at present.
Flyash exists with particle form, and the mineral composition of these particles, size, form are different.People are divided into Beads and the large class of scoriform particle two by shape usually.Research shows, flyash is made up of multiple particulate, and wherein Beads comprises hollow glass spheres (drift pearl), heavy wall and the five large kinds such as solid microbeads (heavy pearl), iron shot (magnetic bead), carbon granule, irregular vitreum and porous vitreum.Wherein irregular vitreum is one of particle more in flyash, and its main component is silicon-dioxide, and is by the seemingly ball adhesion body granulometric composition different with aspheric various perfectly round degree mostly.After some adhesion bodies disconnect, its outward appearance is identical with various glass sphere body with character, and its chemical composition is then slightly different.Porous vitreum likeness in form honeycomb, have larger surface-area, easily stick other chips, density is less, and fusing point is more on the low side than other microballons, its color by milky white to grey not etc.If this part recovery of silica can be utilized, then can alleviate the shortage of fine silica powder dramatically.
At present, mainly contain following several from the method for coal ash for manufacturing prepared silicon dioxide micro mist:
Patent 101049935 discloses a kind of method utilizing flyash to produce silicon-dioxide and aluminum oxide.Be after activation treatment is carried out to flyash, be greater than the NaOH solution leaching of 40% with mass concentration, by silicon wherein with the form stripping of water glass, pass into CO
2gas generation silicon-dioxide, allocates CaO or CaCO in alkali leaching slag
3mature calcined material, prepares aluminum oxide with bayer's process, and waste residue is for the production of cement.
Patent 101993084A is a kind of method of coal ash for manufacturing prepared silicon dioxide and aluminum oxide.The method is for raw material with flyash, sodium hydroxide, calcium oxide, in pyroreaction system, alkali is molten obtains sodium silicate solution, calcium carbonate and desiliconization flyash solid, wherein water glass divides through carbonic acid gas carbon and obtains silicon-dioxide, and calcium carbonate and desiliconization flyash solid obtained aluminum oxide further.
Patent 101759210A is a kind of method extracting high-purity alpha-alumina and silica gel from flyash.The steps such as the method adopts cyclic activation, leaching, carbon divide, sodium hydroxide and Water Sproading, sial separation, pyrolysis, HCl recovery, obtain aluminum oxide and silica gel from flyash.The CO produced in whole technological process
2and the alkali used in leaching process, acid and water are all recyclable and realize recycle.
Above-mentioned from the process of coal ash for manufacturing prepared silicon dioxide, reactions steps is complicated, and the production cycle is longer.
Summary of the invention
The present invention aims to provide a kind of method and the fine silica powder that take residue of aluminum-extracted pulverized fuel ash as raw material and prepare fine silica powder, and when preparing silicon-dioxide from residue of aluminum-extracted pulverized fuel ash to solve in prior art, reactions steps is complicated, the problem that the production cycle is longer.
To achieve these goals, according to an aspect of the present invention, providing a kind of is the method that fine silica powder prepared by raw material with residue of aluminum-extracted pulverized fuel ash, and it comprises the following steps: S1, mixed with residue of aluminum-extracted pulverized fuel ash by sodium hydroxide, calcining, obtains calcined material; S2, in calcined material, add hydrochloric acid, after reaction, to filter and dry, obtain fine silica powder.
Further, in above-mentioned steps S1, be that 0.5 ~ 2:1 mixes according to sodium hydroxide and the mass ratio of residue of aluminum-extracted pulverized fuel ash.
Further, in above-mentioned steps S1, in the process of calcining, calcining temperature is 700 ~ 900 DEG C, and calcination time is 1 ~ 5h.
Further, in above-mentioned steps S2, add in the step of hydrochloric acid to calcined material, the concentration of hydrochloric acid is 10 ~ 30wt%, and the mass ratio of calcined material and described hydrochloric acid is 1:1 ~ 5.
Further, in above-mentioned steps S2, add hydrochloric acid in calcined material after, stir, make it react; Wherein, stir speed (S.S.) is 500 ~ 2000r/min, and churning time is 2 ~ 5h.
Further, before being mixed with residue of aluminum-extracted pulverized fuel ash by sodium hydroxide in above-mentioned steps S1, by residue of aluminum-extracted pulverized fuel ash ball milling, the particle diameter of residue of aluminum-extracted pulverized fuel ash is made to be 0.5 ~ 3 μm.
Further, before adding hydrochloric acid to calcined material in above-mentioned steps S2, by calcined material ball milling, the particle diameter of calcined material is made to be 1 ~ 5 μm.
Further, in above-mentioned steps S2, after obtaining fine silica powder, aftertreatment is carried out to fine silica powder; The step of aftertreatment comprises: fine silica powder being washed to pH is 7, centrifugal, and dry, obtain the fine silica powder of aftertreatment, preferably, in centrifugal process, centrifugal rotational speed is 2000 ~ 4000r/min, and centrifugation time is 5 ~ 15min; In dry process, drying temperature is 70 ~ 120 DEG C, and time of drying is 5 ~ 12h.
According to a further aspect in the invention, provide a kind of fine silica powder, it is prepared from by above-mentioned method.
Further, the purity of above-mentioned fine silica powder is greater than 99%, and specific surface area is greater than 220m
2/ g.
Apply a kind of method and fine silica powder taking residue of aluminum-extracted pulverized fuel ash as raw material and prepare fine silica powder of the present invention, by sodium hydroxide and residue of aluminum-extracted pulverized fuel ash mixed calcining, silicon-dioxide and aluminum oxide can be made to react with sodium hydroxide respectively, form water glass and sodium metaaluminate.Meanwhile, in residue of aluminum-extracted pulverized fuel ash, other carbonaceous material also can change carbonic acid gas into and is removed under the condition of calcining.Add hydrochloric acid in calcined material after, water glass and hcl reaction generate sodium-chlor soluble salt and precipitation of silica, and sodium metaaluminate and hcl reaction form aluminum chloride and the sodium-chlor of solubility, and this is separated with regard to making the silicon-dioxide in calcined material.After filtration and dry, the fine silica powder that purity is higher can be obtained.This take residue of aluminum-extracted pulverized fuel ash as the method that fine silica powder prepared by raw material, and technological operation is simple, and the operational cycle is shorter, is applicable to the remanufacture of extensive fine silica powder.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.The present invention is described in detail below in conjunction with embodiment.
Introducing as background technology part, there is complex process, cycle longer problem in the method preparing silicon-dioxide from residue of aluminum-extracted pulverized fuel ash.In order to address this problem, it is the method that fine silica powder prepared by raw material with residue of aluminum-extracted pulverized fuel ash that inventor provides a kind of, it is characterized in that, comprises the following steps: S1, mixed with residue of aluminum-extracted pulverized fuel ash by sodium hydroxide, calcining, obtains calcined material; S2, in calcined material, add hydrochloric acid, after reaction, to filter and dry, obtain fine silica powder.
In aforesaid method, owing to there is a large amount of silicon-dioxide and aluminum oxide in residue of aluminum-extracted pulverized fuel ash, by sodium hydroxide and residue of aluminum-extracted pulverized fuel ash mixed calcining, silicon-dioxide and aluminum oxide can be made to react with sodium hydroxide respectively, form water glass and sodium metaaluminate.Meanwhile, in residue of aluminum-extracted pulverized fuel ash, other carbonaceous material also can change carbonic acid gas into and is removed under the condition of calcining.Add hydrochloric acid in calcined material after, water glass and hcl reaction generate sodium-chlor soluble salt and precipitation of silica, and sodium metaaluminate and hcl reaction form aluminum chloride and the sodium-chlor of solubility, and this is separated with regard to making the silicon-dioxide in calcined material.After filtration and dry, the fine silica powder that purity is higher can be obtained.This take residue of aluminum-extracted pulverized fuel ash as the method that fine silica powder prepared by raw material, and technological operation is simple, and the operational cycle is shorter, is applicable to the remanufacture of extensive fine silica powder.
In above-mentioned method, the consumption of sodium hydroxide and residue of aluminum-extracted pulverized fuel ash can adjust according to the amount of the silicon-dioxide of question response in residue of aluminum-extracted pulverized fuel ash and aluminum oxide.In a preferred embodiment, in above-mentioned steps S1, be that 0.5 ~ 2:1 mixes according to sodium hydroxide and the mass ratio of residue of aluminum-extracted pulverized fuel ash.Sodium hydroxide concentration is very few, and the silicon-dioxide in residue of aluminum-extracted pulverized fuel ash and aluminum oxide can be caused to react not exclusively, makes part of silica in residue of aluminum-extracted pulverized fuel ash cannot carry out calcining and acid-soluble reaction, thus can reduce the quality of fine silica powder.The consumption of sodium hydroxide is too much, can cause the wasting of resources, also can increase calcining and acid-soluble burden, the production time is increased.According to aforementioned proportion mixing sodium hydroxide and residue of aluminum-extracted pulverized fuel ash, be conducive to the silicon-dioxide in residue of aluminum-extracted pulverized fuel ash and aluminum oxide are reacted more fully on the basis of less sodium hydroxide concentration.
According to the instruction that this law is bright, those skilled in the art have the ability to select concrete calcining process, to make silicon-dioxide in residue of aluminum-extracted pulverized fuel ash and alumina conversion for water glass and sodium metaaluminate.Preferably, in the process of calcining, calcining temperature is 700 ~ 900 DEG C, and calcination time is 1 ~ 5h.Under this calcination condition, be conducive to making the silicon-dioxide in residue of aluminum-extracted pulverized fuel ash and aluminum oxide fully be converted into water glass and sodium metaaluminate, meanwhile, other carbon-containing impurities in residue of aluminum-extracted pulverized fuel ash can also be converted into CO2 removal.
In above-mentioned method, when carrying out hydrochloric acid to calcined material and being acid-soluble, the concentration of hydrochloric acid and consumption can adjust according to the amount of calcined material mesosilicic acid sodium and sodium metaaluminate.In a preferred embodiment, in above-mentioned steps S2, add in the step of hydrochloric acid to calcined material, the concentration of hydrochloric acid is 10 ~ 30wt%, and the mass ratio of calcined material and hydrochloric acid is 1:1 ~ 5.Calcined material carried out hydrochloric acid according to above-mentioned ratio acid-soluble, be conducive to water glass and sodium metaaluminate and hydrogenchloride are fully reacted, with by other component separating in silicon-dioxide and residue of aluminum-extracted pulverized fuel ash.
According to instruction of the present invention, those skilled in the art have the ability to select the concrete acid-soluble technique of hydrochloric acid, react to make the water glass in calcined material and sodium metaaluminate.In a preferred embodiment, in above-mentioned steps S2, add hydrochloric acid in calcined material after, stir, make it react; Wherein, stir speed (S.S.) is 500 ~ 2000r/min, and churning time is 2 ~ 5h.Stir according to the mixed system of above-mentioned condition to hydrochloric acid and calcined material, be conducive to that the water glass in calcined material and the hydrogenchloride in hydrochloric acid are fully reacted and form sodium-chlor soluble salt and precipitation of silica, hydrogenchloride in sodium metaaluminate and hydrochloric acid is fully reacted and forms aluminum chloride soluble salt and sodium-chlor soluble salt, thus be conducive to silicon-dioxide is fully separated, improve the purity of fine silica powder further.
In above-mentioned method, as long as calcined by the mixture of residue of aluminum-extracted pulverized fuel ash and sodium hydroxide, the two reaction can be made to form water glass and sodium metaaluminate.In a preferred embodiment, before being mixed with residue of aluminum-extracted pulverized fuel ash by sodium hydroxide in above-mentioned steps S1, by residue of aluminum-extracted pulverized fuel ash ball milling, as ball milling 5 ~ 15min, the particle diameter of residue of aluminum-extracted pulverized fuel ash is made to be 0.5 ~ 3 μm.Make its particle diameter reach above-mentioned scope residue of aluminum-extracted pulverized fuel ash ball milling, be conducive to itself and sodium hydroxide are fully reacted, meanwhile, ball milling can by residue of aluminum-extracted pulverized fuel ash mechanical activation, thus make its reactive behavior improve, and improves the rate of recovery of silicon-dioxide further.
In above-mentioned method, as long as it is acid-soluble calcined material to be carried out hydrochloric acid, the water glass in calcined material and sodium metaaluminate and hydrogenchloride can be made to react.In a preferred embodiment, before adding hydrochloric acid to calcined material in above-mentioned steps S2, by calcined material ball milling, as ball milling 2 ~ 10min, the particle diameter of calcined material is made to be 1 ~ 5 μm.Calcined material being carried out ball milling makes its particle diameter be positioned at above-mentioned scope, be conducive to the speed of reaction improving water glass and sodium metaaluminate and hydrogenchloride, meanwhile, ball milling can by calcined material mechanical activation, thus its reactive behavior is improved, improve the rate of recovery and the activity of silicon-dioxide further.
In above-mentioned method, after acid-soluble for calcined material hydrochloric acid, just by silicon-dioxide with the isolated in form of precipitation out, after filtration drying, fine silica powder can be obtained.In a preferred embodiment, in above-mentioned steps S2, after obtaining fine silica powder, aftertreatment is carried out to fine silica powder; The step of aftertreatment comprises: fine silica powder being washed to pH is 7, centrifugal, dry, obtains the fine silica powder of aftertreatment.Being washed to pH is 7, can remove hydrochloric acid residual in fine silica powder, thus the purity of fine silica powder is improved.
According to instruction of the present invention, those skilled in the art have the ability to select concrete aftertreatment technology, and by out centrifugal from aqueous suspension for the fine silica powder after washing, and drying obtains product.In a preferred embodiment, in centrifugal process, centrifugal rotational speed is 2000 ~ 4000r/min, and centrifugation time is 5 ~ 15min; In dry process, drying temperature is 70 ~ 120 DEG C, and time of drying is 5 ~ 12h.According to above-mentioned centrifugal and drying conditions, fine silica powder can be made centrifugal and dry fully, thus improve the rate of recovery and the purity of fine silica powder.
In addition, inventor additionally provides a kind of fine silica powder, and it is prepared from by above-mentioned method.According to the fine silica powder that above-mentioned method is prepared from residue of aluminum-extracted pulverized fuel ash, make it have higher purity and specific surface area through calcining and the acid-soluble step of hydrochloric acid.Wherein, the purity of fine silica powder is greater than 99%, and specific surface area is greater than 220m
2/ g.The fine silica powder of the high purity high-specific surface area prepared from residue of aluminum-extracted pulverized fuel ash like this can meet the application requiring in most of field, and then effectively can alleviate the shortage of fine silica powder.
Be described in further detail the present invention below in conjunction with specific embodiment, these embodiments can not be interpreted as restriction the present invention scope required for protection.
Embodiment 1
By residue of aluminum-extracted pulverized fuel ash ball milling 5min, its median size is made to reach 3 μm.Sodium hydroxide and residue of aluminum-extracted pulverized fuel ash being mixed according to mass ratio 0.5:1 is placed in retort furnace, calcines 1h, obtain calcined material at 900 DEG C;
By above-mentioned calcined material ball milling 2min, its median size is made to reach 5 μm.In calcined material, add according to the mass ratio 1:1 of calcined material and hydrochloric acid the hydrochloric acid that concentration is 10wt%, low whipping speed is after 1000r/min magnetic agitation 5h, filters, obtains much filtrate;
Above-mentioned much filtrate is washed to pH value and equals 7, then centrifugal 5min under the condition of 4000r/min, at 70 DEG C of temperature, dry 10h, obtains fine silica powder.
Embodiment 2:
By residue of aluminum-extracted pulverized fuel ash ball milling 15min, its median size is made to reach 0.5 μm.Sodium hydroxide and residue of aluminum-extracted pulverized fuel ash being mixed according to mass ratio 2:1 is placed in retort furnace, calcines 5h, obtain calcined material at 900 DEG C;
By above-mentioned calcined material ball milling 5min, its median size is made to reach 3 μm.In calcined material, add according to the mass ratio 1:5 of calcined material and hydrochloric acid the hydrochloric acid that concentration is 30wt%, low whipping speed is after 2000r/min magnetic agitation 2h, filters, obtains much filtrate;
Above-mentioned much filtrate is washed to pH value and equals 7, then centrifugal 15min under the condition of 3000r/min, at 170 DEG C of temperature, dry 5h, obtains fine silica powder.
Embodiment 3:
By residue of aluminum-extracted pulverized fuel ash ball milling 10min, its median size is made to reach 2 μm.Sodium hydroxide and residue of aluminum-extracted pulverized fuel ash being mixed according to mass ratio 1:1 is placed in retort furnace, calcines 3h, obtain calcined material at 700 DEG C;
By above-mentioned calcined material ball milling 10min, its median size is made to reach 1 μm.In calcined material, add according to the mass ratio 1:3 of calcined material and hydrochloric acid the hydrochloric acid that concentration is 15wt%, low whipping speed is after 500r/min magnetic agitation 10h, filters, obtains much filtrate;
Above-mentioned much filtrate is washed to pH value and equals 7, then centrifugal 10min under the condition of 2000r/min, at 80 DEG C of temperature, dry 12h, obtains fine silica powder.
Embodiment 4:
By residue of aluminum-extracted pulverized fuel ash ball milling 8min, its median size is made to reach 3 μm.Sodium hydroxide and residue of aluminum-extracted pulverized fuel ash being mixed according to mass ratio 2:1 is placed in retort furnace, calcines 4h, obtain calcined material at 800 DEG C;
By above-mentioned calcined material ball milling 8min, its median size is made to reach 2.5 μm.In calcined material, add according to the mass ratio 1:2 of calcined material and hydrochloric acid the hydrochloric acid that concentration is 10wt%, low whipping speed is after 500r/min magnetic agitation 2h, filters, obtains much filtrate;
Above-mentioned much filtrate is washed to pH value and equals 7, then centrifugal 10min under the condition of 3500r/min, at 70 DEG C of temperature, dry 10h, obtains fine silica powder.
Embodiment 5:
Sodium hydroxide and residue of aluminum-extracted pulverized fuel ash being mixed according to mass ratio 0.4:1 is placed in retort furnace, calcines 6h, obtain calcined material at 650 DEG C;
In calcined material, add according to the mass ratio 1:0.8 of calcined material and hydrochloric acid the hydrochloric acid that concentration is 35wt%, low whipping speed is after 480r/min magnetic agitation 1.5h, filters, obtains much filtrate;
Above-mentioned much filtrate is washed to pH value and equals 7, then centrifugal 4min under the condition of 1800r/min, at 65 DEG C of temperature, dry 4h, obtains fine silica powder.
Embodiment 6:
By residue of aluminum-extracted pulverized fuel ash ball milling 4min, its median size is made to reach 4 μm.Sodium hydroxide and residue of aluminum-extracted pulverized fuel ash being mixed according to mass ratio 2.5:1 is placed in retort furnace, calcines 1.5h, obtain calcined material at 1000 DEG C;
By above-mentioned calcined material ball milling 0.5min, its median size is made to reach 10 μm.In calcined material, add according to the mass ratio 1:0.6 of calcined material and hydrochloric acid the hydrochloric acid that concentration is 8wt%, low whipping speed is after 2200r/min magnetic agitation 11h, filters, obtains much filtrate;
Above-mentioned much filtrate is washed to pH value and equals 7, then centrifugal 20min under the condition of 4500r/min, at 140 DEG C of temperature, dry 14h, obtains fine silica powder.
Characterization test is carried out to the fine silica powder in above-described embodiment.
Testing method:
1) purity: adopt the purity of Xray fluorescence spectrometer to fine silica powder to characterize;
2) specific surface area: adopt the specific surface area of N2 adsorption specific surface area measuring instrument to fine silica powder to characterize; Result is as shown in table 1:
Table 1
| Purity (%) | Specific surface area (m 2/g） | |
| Embodiment 1 | 99.25 | 237 |
| Embodiment 2 | 99.47 | 275 |
| Embodiment 3 | 99.09 | 228 |
| Embodiment 4 | 99.61 | 280 |
| Embodiment 5 | 99.01 | 200 |
| Embodiment 6 | 99.05 | 216 |
From above data, can find out, adopt the fine silica powder that the method in the above embodiments of the present invention is prepared from residue of aluminum-extracted pulverized fuel ash, its purity is higher, specific surface area is larger.In particular, with the fine silica powder prepared by the processing condition in embodiment 1 to 4, its purity is higher, specific surface area is larger.
Generally speaking, adopt method provided by the present invention, residue of aluminum-extracted pulverized fuel ash can be made to turn waste into wealth, make silicon-dioxide wherein obtain efficient recovery, and prepared fine silica powder has higher quality.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. be the method that fine silica powder prepared by raw material with residue of aluminum-extracted pulverized fuel ash, it is characterized in that, comprise the following steps:
By described residue of aluminum-extracted pulverized fuel ash ball milling 8min, its median size is made to reach 3 μm; Sodium hydroxide and described residue of aluminum-extracted pulverized fuel ash being mixed according to mass ratio 2:1 is placed in retort furnace, calcines 4h, obtain calcined material at 800 DEG C;
By described calcined material ball milling 8min, its median size is made to reach 2.5 μm; In described calcined material, add the hydrochloric acid that concentration is 10wt% according to the mass ratio 1:2 of described calcined material and hydrochloric acid, low whipping speed is after 500r/min magnetic agitation 2h, filters, obtains much filtrate;
Described much filtrate is washed to pH value and equals 7, then centrifugal 10min under the condition of 3500r/min, dry 10h at 70 DEG C of temperature, obtains described fine silica powder.
2. a fine silica powder, is characterized in that, is prepared from by method according to claim 1.
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| CN105502419B (en) * | 2015-12-21 | 2018-05-01 | 华东理工常熟研究院有限公司 | A kind of extensive method for preparing mesoporous silicon oxide |
| CN107285774B (en) * | 2016-04-05 | 2020-04-24 | 神华集团有限责任公司 | Method for preparing mullite from white mud or fly ash and prepared mullite |
| CN107285739B (en) * | 2016-04-05 | 2022-04-19 | 国家能源投资集团有限责任公司 | Multi-component composite phase material and preparation method thereof |
| CN106044784B (en) * | 2016-07-27 | 2018-07-10 | 陕西师范大学 | A kind of method using flyash production high-purity silicon dioxide |
| CN106517222A (en) * | 2016-11-14 | 2017-03-22 | 清华大学 | Method for synthesizing ordered mesopore nano-silica through pulverous coal |
| CN111517344A (en) * | 2020-05-15 | 2020-08-11 | 中能化江苏地质矿产设计研究院有限公司 | Method for extracting aluminum from coal ash |
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