CN107364872A - A kind of method for removing galapectite iron in minerals and alunite - Google Patents
A kind of method for removing galapectite iron in minerals and alunite Download PDFInfo
- Publication number
- CN107364872A CN107364872A CN201710019256.0A CN201710019256A CN107364872A CN 107364872 A CN107364872 A CN 107364872A CN 201710019256 A CN201710019256 A CN 201710019256A CN 107364872 A CN107364872 A CN 107364872A
- Authority
- CN
- China
- Prior art keywords
- galapectite
- alunite
- iron
- solution
- purity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- C01B33/20—Silicates
- C01B33/26—Aluminium-containing silicates, i.e. silico-aluminates
- C01B33/28—Base exchange silicates, e.g. zeolites
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/04—Particle morphology depicted by an image obtained by TEM, STEM, STM or AFM
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/10—Particle morphology extending in one dimension, e.g. needle-like
- C01P2004/13—Nanotubes
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
- C01P2006/65—Chroma (C*)
-
- C—CHEMISTRY; METALLURGY
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
Abstract
The invention provides a kind of method for removing galapectite iron in minerals and alunite, belong to Deep processing of minerals field.Preparation method of the present invention includes four steps:(1) preparation of galapectite mineral powder, (2) roughing of galapectite mineral, (3) preparation of the aqueous solution such as mixed acid, strong ionic salt, hydro-thermal and the galapectite for obtaining high-purity iron-free and alunite is cleaned under (4) certain temperature.Purity provided by the present invention is high, iron-free and alunite and the high-purity halloysite of similar impure mineral, realize the substep ionic compartmentation to alunite, process costs are cheap, common existing alunite and iron impurities in galapectite mineral can be removed, the purity of galapectite can be greatly improved, while improves the whiteness of product, does not destroy the tubular morphology of galapectite, and suitably expand the internal diameter of galapectite pipe, and lift the specific surface area of product.
Description
Technical field
The present invention relates to a kind of method of nonmetallic ore purification, especially a kind of raw ore containing alunite prepares high-purity angstrom of Lip river
The method of stone.
Background technology
The chemical composition of galapectite is Al [Si2O5](OH)4·2H2O, belong to the aqueous layer silicate of monoclinic system
Mineral.Crystal structure belongs to 1 similar in appearance to kaolin:The dioctahedron type structure of 1 type construction unit layer, but construction unit layer it
Between with the presence of intermediary water, therefore also referred to as halloysite.Most of intermediary water is lost at 50~90 DEG C, turns into galapectite.Ai Luo
Stone is in generally compact shape or white, greyish white, yellow ribbon, under an electron microscope in straight tube-like condition, is shown in transmitted electron
It is in natural hollow nano tubular morphology under micro mirror (TEM), pipe external diameter is 50~100nm, and internal diameter is 16~30nm, and pipe range is several
Hundred nanometers.In former report, galapectite is usually used in preparing high quality whiteware material, but surcharge is relatively low.
The surface of galapectite and the heterogeneity of tube cavity determined by its microstructure, halloysite nanotubes be by
Silicon-oxy tetrahedron [SiO4] and alumina octahedral [AlO6] press 1：1 order is arranged to make up, and this arrangement is very regular,
It is [SiO outside all galapectite pipes4], and inside is then [AlO6], therefore the property of the surfaces externally and internally of galapectite mineral is poor
Heteropole is big.As a kind of more natural nanotube-shaped mineral are distributed in a kind of earth's crust, galapectite has in all parts of the world
Substantial amounts of mineral reserve, but due to wherein containing plurality of impurities, such as limonite, alunite, kaolinite, illite, chlorite, three water
Aluminium stone, di-iron trioxide etc., hinder its application in nm regime.In above-mentioned various impurity, because galapectite is in acidity
Caused by hydrothermal solution leaching, alunite impurity (K (Al are typically all associated with3(SO4)2(OH)6)), thus remove alunite or similar
Impurity it is particularly important in the application of galapectite.But alunite is a kind of not soluble in water, also without the associated minerals of reactivity
Thing, it is difficult to effectively remove using in general method, so as to hinder the application of galapectite mineral in the industrial production.
(Qin Feng etc., nonmetallic ore, 2016,39 (4) in existing data：11-13) report in the method for water-bath acidleach
The technology of galapectite is brightened, purifies, the reduction for the iron content being successfully realized in galapectite mineral.But XRD therefrom comes
See, do not eliminate alunite impurity therein substantially, the XRD peaks (17.95 °, 29.82 °) for belonging to alunite do not have before and after acidleach
Effectively eliminated.Patent CN101759195A discloses the kaolinite mineral slurries that will be prepared by being sieved after grader,
Centrifugation progress is fine graded after adding dispersant afterwards, and high-purity halloysite is obtained after concentrate drying；Patent CN101704531A
Disclose and centrifuged after dispersant stirring is directly added to galapectite mineral slurry, be dried to obtain the high-purity angstrom of Lip river that purity is more than 90%
Stone.Although the method for above two patent can remove most impurity in mineral, the alunite similar to galapectite year
Impurity does not remove but.And patent CN102275946A is disclosed and hydrochloric acid is added after mineral slurry is centrifuged, ore deposit is eliminated
Gibbsite impurity in thing.Not only technique is complex for the method, and does not remove the alunite impurity in mineral.Other documents
In data, the report to removing alunite impurity in galapectite raw ore is also had no.
The content of the invention
The present invention has the characteristic of stronger ion-exchange capacity based on alunite under certain condition, using a kind of mixed acid and
The mixed solution hydro-thermal process galapectite raw ore of strong ionic salt, will by the ion exchange and solvability under hydrothermal condition
The insoluble K of crystallization in alunite+、Al3+And SO4 2―Fe in ion and galapectite3+Coloring impurity ion etc., step by step quilt
H+、Na+、Cl―、NO3 ―Plasma substitute, resolve into soluble-salt, so as to reach remove galapectite mineral in association alunite and
The method of iron tramp, prepare the purification galapectite of the mineral such as a kind of high purity, iron-free and alunite.Product is in appropriate condition
Under, remain to keep its tubular morphology, reached the purpose of purification, and can suitably expand the bore of galapectite mineral, be advantageous to
Application of the galapectite mineral in functional material.
A kind of method for removing galapectite iron in minerals and alunite, its specific preparation process are：
Step 1: by the ground 200 mesh sieves of galapectite raw ore, galapectite raw ore powder is obtained, it is standby；
Step 2: it is 1 according to solid-to-liquid ratio:60~1:100(g：ML ratio) takes galapectite obtained by step 1 and water mixing,
Magnetic agitation obtains dirty solution after 1~3 hour at room temperature, is filtered, and is carried out repeatedly to filtering gained solid product
After washing, dried 8~12 hours at a temperature of 60~80 DEG C, obtain roughing galapectite；
Step 3: configuration concentration is the aqueous solution such as 0.1~2mol/L inorganic acid, strong ionic salt, it is standby；
Step 4: taking the acid solution and ion salt solution of proper proportion, according to appropriate solid-to-liquid ratio, take obtained by step 2
Roughing galapectite, the mixed acid of step 3, the solution of salt, at room temperature magnetic agitation dirty solution is obtained after 1~3 hour, then
Hydro-thermal reaction in reactor is transferred to, is filtered after being cooled to room temperature, after clear water washing, is dried at a temperature of 60~80 DEG C
It is dry, obtain the galapectite of high-purity iron-free and alunite.
The beneficial effects of the invention are as follows：
1st, the present invention is to prepare a kind of high purity, iron-free and alunite and the high-purity halloysite of similar impure mineral, system
Standby cost is cheap, can remove common existing alunite and iron impurities in galapectite mineral, can greatly improve galapectite
Purity improves the whiteness of product to more than 90, does not destroy the tubular morphology of galapectite, and suitably expand galapectite to more than 97%
The internal diameter of pipe, and the specific surface area of product is lifted, acceptable material can be provided for application of the galapectite in nm regime, had important
Application value；
2nd, the present invention prepared by high-purity halloysite experiment proves that, be uniformly dispersed, crystalline tubular form is complete, soilless sticking
With sleeve pipe phenomenon, about 50~100 μm, pipe external diameter about 50~100nm, bore about 35~60nm of halloysite nanotubes pipe range, than
Surface area reaches 110m2/ more than g, there is natural nano polycrystalline material property.
Brief description of the drawings
Fig. 1 is the XRD spectra of galapectite raw ore.
Fig. 2 is the XRD spectra of high-purity halloysite prepared by embodiment 1.
Fig. 3 is the TEM figures of high-purity halloysite prepared by embodiment 3.
Embodiment
For a better understanding of the present invention, present disclosure is further illustrated with reference to embodiment, but the present invention is simultaneously
Following examples are not limited to, person skilled in the relevant technique, without departing from the spirit and scope of the present invention, are gone back
Can be so that various changes can be made.Therefore, all equivalent technical schemes should also belong to scope of the invention, should be by each claim
Limit.
Embodiment 1
A kind of method for removing galapectite iron in minerals and alunite, its specific preparation process are：
Step 1: by the ground 200 mesh sieves of galapectite raw ore, galapectite raw ore powder is obtained, it is standby；
Step 2: it is 1 according to solid-to-liquid ratio:100(g：ML ratio) takes galapectite obtained by step 1 and water mixing, in room temperature
Lower magnetic agitation obtains dirty solution after 3 hours, is filtered, and is carried out to filtering gained solid product after repeatedly washing, 60
Dried 8 hours at a temperature of DEG C, obtain roughing galapectite；
Step 3: 2.2mL concentrated nitric acid, the 1.4mL concentrated sulfuric acid, 0.4g ammonium chlorides and 0.2g sodium chloride are added
In the 71.4mL aqueous solution, after being stirred 0.5 hour at 60 DEG C, the aqueous solution such as mixed acid, strong ionic salt are obtained, it is standby；
Step 4: taking the acid solution and ion salt solution of proper proportion, according to appropriate solid-to-liquid ratio, take obtained by step 2
Roughing galapectite, the mixed acid of step 3, the solution of salt, at room temperature magnetic agitation dirty solution is obtained after 3 hours, then shift
The hydro-thermal reaction into reactor, filtered after being cooled to room temperature, after clear water washing, dry, obtain at a temperature of 60 DEG C
The galapectite of high-purity iron-free and alunite.
Embodiment 2
A kind of method for removing galapectite iron in minerals and alunite, its specific preparation process are：
Step 1: by the ground 200 mesh sieves of galapectite raw ore, galapectite raw ore powder is obtained, it is standby；
Step 2: it is 1 according to solid-to-liquid ratio:50(g：ML ratio) takes galapectite obtained by step 1 and water mixing, in room temperature
Lower magnetic agitation obtains dirty solution after 1 hour, is filtered, and is carried out to filtering gained solid product after repeatedly washing, 60
Dried 8 hours at a temperature of DEG C, obtain roughing galapectite；
Step 3: 0.7mL concentrated nitric acid, 0.7mL concentrated hydrochloric acid, 1.1g sodium chloride and 0.6g potassium chloride are added
In the 73.6mL aqueous solution, after being stirred 0.5 hour at 60 DEG C, the aqueous solution such as mixed acid, strong ionic salt are obtained, it is standby；
Step 4: taking the acid solution and ion salt solution of proper proportion, according to appropriate solid-to-liquid ratio, take obtained by step 2
Roughing galapectite, the mixed acid of step 3, the solution of salt, at room temperature magnetic agitation dirty solution is obtained after 1 hour, then shift
The hydro-thermal reaction into reactor, filtered after being cooled to room temperature, after clear water washing, dry, obtain at a temperature of 60 DEG C
The galapectite of high-purity iron-free and alunite.
Embodiment 3
A kind of method for removing galapectite iron in minerals and alunite, its specific preparation process are：
Step 1: by the ground 200 mesh sieves of galapectite raw ore, galapectite raw ore powder is obtained, it is standby；
Step 2: it is 1 according to solid-to-liquid ratio:100(g：ML ratio) takes galapectite obtained by step 1 and water mixing, in room temperature
Lower magnetic agitation obtains dirty solution after 1 hour, is filtered, and is carried out to filtering gained solid product after repeatedly washing, 60
Dried 8 hours at a temperature of DEG C, obtain roughing galapectite；
Step 3: 3.6mL concentrated nitric acid, 3.3mL concentrated hydrochloric acid, 2.1g ammonium chlorides and 2.8g potassium chloride are added
In the 68.1mL aqueous solution, after being stirred 0.5 hour at 60 DEG C, the aqueous solution such as mixed acid, strong ionic salt are obtained, it is standby；
Step 4: taking the acid solution and ion salt solution of proper proportion, according to appropriate solid-to-liquid ratio, take obtained by step 2
Roughing galapectite, the mixed acid of step 3, the solution of salt, at room temperature magnetic agitation dirty solution is obtained after 1 hour, then shift
The hydro-thermal reaction into reactor, filtered after being cooled to room temperature, after clear water washing, dry, obtain at a temperature of 80 DEG C
The galapectite of high-purity iron-free and alunite.
Claims (5)
- A kind of 1. method for removing galapectite iron in minerals and alunite, it is characterised in that：Including following specific step：Step 1: by the ground 200 mesh sieves of galapectite raw ore, galapectite raw ore powder is obtained, it is standby；Step 2: it is 1 according to solid-to-liquid ratio:60~1:100(g：ML ratio) takes galapectite obtained by step 1 and water mixing, in room The lower magnetic agitation of temperature obtains dirty solution after 1~3 hour, is filtered, and is repeatedly washed to filtering gained solid product Afterwards, dry 8~12 hours at a temperature of 60~80 DEG C, obtain roughing galapectite；Step 3: configuration concentration is the aqueous solution such as 0.1~2mol/L inorganic acid, strong ionic salt, it is standby；Step 4: taking the acid solution and ion salt solution of proper proportion, according to appropriate solid-to-liquid ratio, roughing obtained by step 2 is taken Galapectite, the mixed acid of step 3, the solution of salt, at room temperature magnetic agitation dirty solution is obtained after 1~3 hour, then shift The hydro-thermal reaction into reactor, filtered after being cooled to room temperature, after clear water washing, dried at a temperature of 60~80 DEG C, Obtain the galapectite of high-purity iron-free and alunite.
- 2. method according to claim 1, it is characterised in that：Inorganic acid described in step 3 etc. includes hydrochloric acid, nitric acid, sulphur Two or three of mixing in acid solution, solution concentration is 0.1~1mol/L, preferably 0.6mol/L；Described strong ionic salt To be one or two kinds of in sodium chloride, sal-ammoniac, potassium chloride, concentration of salt solution is 0.1~1mol/L, preferably 0.2mol/L.
- 3. method according to claim 1, it is characterised in that：Solid-to-liquid ratio described in step 4 is 1：20~75 (g：ML), It is preferred that 1：75(g：mL).
- 4. method according to claim 1, it is characterised in that：Step 4 reclaimed water heat treatment temperature is at 100~180 DEG C, preferably 150 DEG C, described hydro-thermal reaction is 2~8h, preferably 5h.
- A kind of 5. high-purity halloysite of the iron-free and alunite prepared by the method as described in claim 1, it is characterised in that：It is real Now to the substep ionic compartmentation of alunite, process costs are cheap, can remove common existing alunite and iron in galapectite mineral Matter impurity, can greatly improve the purity of galapectite, while improve the whiteness of product, not destroy the tubular morphology of galapectite, and The appropriate internal diameter for expanding galapectite pipe, and lift the specific surface area of product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710019256.0A CN107364872A (en) | 2017-01-11 | 2017-01-11 | A kind of method for removing galapectite iron in minerals and alunite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710019256.0A CN107364872A (en) | 2017-01-11 | 2017-01-11 | A kind of method for removing galapectite iron in minerals and alunite |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107364872A true CN107364872A (en) | 2017-11-21 |
Family
ID=60303706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710019256.0A Pending CN107364872A (en) | 2017-01-11 | 2017-01-11 | A kind of method for removing galapectite iron in minerals and alunite |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107364872A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021085375A1 (en) * | 2019-10-28 | 2021-05-06 | Ｊｆｅミネラル株式会社 | Halloysite powder |
| CN113135574A (en) * | 2021-04-23 | 2021-07-20 | 中南大学 | Method for removing impurities and expanding halloysite tube cavity |
| CN114759190A (en) * | 2022-04-01 | 2022-07-15 | 中南大学 | Preparation method for preparing lithium-sulfur battery sulfur positive electrode by tubular mineral |
-
2017
- 2017-01-11 CN CN201710019256.0A patent/CN107364872A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021085375A1 (en) * | 2019-10-28 | 2021-05-06 | Ｊｆｅミネラル株式会社 | Halloysite powder |
| JPWO2021085375A1 (en) * | 2019-10-28 | 2021-05-06 | ||
| CN114599607A (en) * | 2019-10-28 | 2022-06-07 | 杰富意矿物股份有限公司 | Halloysite powder |
| JP7381598B2 (en) | 2019-10-28 | 2023-11-15 | Ｊｆｅミネラル株式会社 | halloysite powder |
| CN113135574A (en) * | 2021-04-23 | 2021-07-20 | 中南大学 | Method for removing impurities and expanding halloysite tube cavity |
| CN114759190A (en) * | 2022-04-01 | 2022-07-15 | 中南大学 | Preparation method for preparing lithium-sulfur battery sulfur positive electrode by tubular mineral |
| CN114759190B (en) * | 2022-04-01 | 2023-11-21 | 中南大学 | Preparation method for preparing lithium-sulfur battery sulfur anode from tubular minerals |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11524901B2 (en) | Method for efficiently separating magnesium and lithium from salt lake brine and simultaneously preparing high-purity magnesium oxide and battery-grade lithium carbonate | |
| Wang et al. | The dissolution behavior and mechanism of kaolinite in alkali-acid leaching process | |
| WO2015165369A1 (en) | Method for preparing nanometer titanium dioxide | |
| CN105802282B (en) | The method for preparing red hybrid pigment using red attapulgite stone clay | |
| CN107364872A (en) | A kind of method for removing galapectite iron in minerals and alunite | |
| CN105154979B (en) | A kind of method for producing phosphoric acid by wet process by-product αsemiwatergypsum whisker and the high whiteness αsemiwatergypsum whisker of high-purity | |
| CN104894636B (en) | The preparation method of eight potassium titanate crystal whiskers | |
| JP2014519468A (en) | Method for preparing hematite | |
| CN106315605B (en) | Method for preparing 1.1nm tobermorite from low-grade attapulgite clay | |
| CN112357955B (en) | Method for preparing titanium dioxide powder with different morphologies by solid phase method | |
| Li et al. | Comprehensive use of dolomite-talc ore to prepare talc, nano-MgO and lightweight CaCO3 using an acid leaching method | |
| US20220212940A1 (en) | Synthesis of adsorption materials | |
| CN108658092B (en) | Method for preparing P-type molecular sieve and high-silicon mordenite from aluminum residue extracted by fly ash acid method and utilization method of fly ash | |
| CN101983924B (en) | Method for preparing calcium carbonate with controllable topography by using calcium sulfate | |
| CN103601203A (en) | Halloysite nanotube purification method | |
| CN105129834B (en) | A kind of nanometer level RE oxide raw powder's production technology | |
| CN100465096C (en) | Method for preparing sheet alumina using coal series kaolin rock or flyash as raw material | |
| Zhang et al. | Thiourea-induced change of structure and color of brick-red palygorskite | |
| CN107285378A (en) | The method that ilmenite concentrate prepares macroporous titanium dioxide material | |
| CN107117627A (en) | Rapid preparation of intercalation vermiculite superfine powder by ball grinding method | |
| RU2740995C1 (en) | Method of producing microsilica from natural diatomite by precipitation of nitric acid solution | |
| CN109574024A (en) | The method for preparing silica nano material using natural 1-dimention nano clay mineral | |
| CN111302352B (en) | Iron-removing and whitening method for attapulgite | |
| CN112320831A (en) | Method for preparing aluminum chloride crystal from fly ash to synergistically produce gallium metal | |
| CN108658086B (en) | Method for preparing sodalite and high-silicon mordenite from residue of aluminum extraction by fly ash acid method and utilization method of fly ash |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20171121 |