CN105271297A - Method for preparing 4A molecular sieves by using tailings and application of 4A molecular sieves - Google Patents
Method for preparing 4A molecular sieves by using tailings and application of 4A molecular sieves Download PDFInfo
- Publication number
- CN105271297A CN105271297A CN201510691372.8A CN201510691372A CN105271297A CN 105271297 A CN105271297 A CN 105271297A CN 201510691372 A CN201510691372 A CN 201510691372A CN 105271297 A CN105271297 A CN 105271297A
- Authority
- CN
- China
- Prior art keywords
- molecular sieve
- molecular sieves
- mine tailing
- time
- tailings
- 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
Landscapes
- Manufacture And Refinement Of Metals (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
Abstract
The invention belongs to the field of silicate compounds and particularly relates to a method for preparing 4A molecular sieves by using tailings and an application of the 4A molecular sieves. The method comprises 4A molecular sieve synthesis steps as follows: high temperature alkali fusion of sodium carbonate, water addition for ageing, heating for crystallization as well as washing and drying. Al(OH)3 is added before high temperature alkali fusion, and a raw material NaAlSiO4 required by synthesis of the molecular sieves can be generated during alkali fusion. The synthesized molecular sieves are used for treating lead containing wastewater, the optimal pH ranges from 4 to 8, the treatment time is within 10 s, the treatment effect reaches the national emission standard, and the adsorption capacity ranges from 150 mg/g to 200 mg/g. The molecular sieve recovery effects are as follows: more than 70% of the molecular sieves are recovered for the first time, and more than 93% of the molecular sieves are recovered for the second time and the third time. The method for preparing the 4A molecular sieves by using the tailings and the application of the 4A molecular sieves have the benefits as follows: according to the method, the molecular sieves are synthesized by using the high-silicon tailings, the wastewater is treated, environmental problems caused by the tailings are solved, the heavy metal wastewater can also be treated, and the purpose of waste control by waste is achieved.
Description
Technical field
The invention belongs to silicate compound field, relate to a kind of utilize mine tailing to prepare 4A molecular sieve method and application.
Background technology
4A molecular sieve is a kind of alkali metal aluminosilicate of cubic crystallographic state, is connected and is formed have the porous material of duct and cavity by silicon-oxy tetrahedron with aluminum-oxygen tetrahedron by oxo bridge key.This special skeleton structure is often electronegative, and metallic cation is balancing charge, among the duct being distributed in skeleton structure and cage, has larger mobility, in the solution, can carry out cationic exchange, reduces harmful heavy metal content in water.At plumbous smelting industry, the lead waste water that normal generation is a large amount of, lead waste water has teratogenesis, causes prominent and carcinogenic harm, utilizes molecular sieve process lead waste water will be an one new developing direction.
The raw material synthesizing 4A molecular sieve in industry mostly is chemical pure water glass and aluminium hydroxide, and expensive, raw materials cost is high.Element required in 4A sieve synthesis procedure mostly is the composition that in mine tailing and lean ore, content is a lot, as SiO
2and Al
2o
3, be the main raw material of Zeolite synthesis, utilize the report of kaolin and flyash synthesis of molecular sieve also to progress into the visual field of people at present.China's make of refuse and accumulating amount huge, to environment and safety produce serious threat, effectively utilize mine tailing synthesis of molecular sieve to bring the double benefit of environment and economy.The molecular sieve process lead waste water of synthesis is utilized to reach the object of the treatment of wastes with processes of wastes against one another.
Summary of the invention
In order to solve the problem, the object of this invention is to provide one and utilizing mine tailing to prepare 4A molecular sieve, recycling synthesis of molecular sieve process lead waste water, and the molecular sieve after process is recycled.Make full use of resource of tailings, realize the recycling of waste, reduce production cost, utilize the molecular sieve process lead waste water of synthesis, realize the target of the treatment of wastes with processes of wastes against one another.The present invention is intended to utilize and prepares molecular sieve containing silicon tailings, utilizes the molecular sieve process lead waste water of synthesis, and reclaim molecular sieve prepare the method for 4A molecular sieve and application and recovery process with mine tailing.
Technical scheme of the present invention is: a kind of mine tailing prepares the method for 4A molecular sieve, after mine tailing is milled to certain particle size by the method, then with a certain amount of solid Na
2cO
3with solid Al (OH)
3mixing, through high temperature alkali fuse-add water ageing-heating crystalline-washing and drying, obtains having cubes crystalline structure, the 4A molecular sieve of even particle distribution.
Specifically comprising the following steps of the method:
Step 1. high temperature alkali fuse: a certain amount of mine tailing is milled to 325 orders, with certain solid Na
2cO
3with solid Al (OH)
3mixing, be placed in heat reaction again in crucible, Heating temperature is 840-860 DEG C, heats and is incubated 1.8-2.2h, obtaining sample ore, for subsequent use;
Step 2. adds water ageing: the sample ore that step 1 obtains adds water and stirs ageing 25-35min; Wherein, sample ore and quality are than being 1:5-1:10;
Step 3. heating crystalline: the sample ore after above-mentioned is placed in reactor, temperature is 100 DEG C-120 DEG C, and the time is 3-5h;
Step 4: washing is dry: the sample ore after above-mentioned steps washes filtration with water, dry 5h at temperature is 45-60 DEG C, namely obtains having cubes crystalline structure, the 4A molecular sieve of even particle distribution.
Further, in described step 1: sodium carbonate and the silicon-dioxide quality in mine tailing are than being 1:0.8-1:1.2, and the silicon-dioxide in mine tailing and alumina molar ratio are 2.
Further, SiO in described mine tailing
2containing more than 50%, Al
2o
3containing 5%-20% and Fe
2o
3and other a small amount of K
2o, CaO, MgO, and the impurity that Ti, P, Zn etc. are micro-.
Further, described in there is cubes crystalline structure, the loading capacity of the 4A molecular sieve of even particle distribution is 100mg/g-200mg/g.
The 4A molecular sieve prepared of a kind of aforesaid method is applied in process lead waste water, be pH is 4.6 by the molecular sieve process lead waste water suitable condition of above-mentioned synthesis, and the treatment time is within 10s, and loading capacity is 150-200mg/g.Treating processes is: the lead waste water 200ml getting 0.12g molecular sieve process 100mg/L, measure plumbum ion concentration after 1h, plumbum ion concentration drops to below 0.5mg/L, reaches discharging standards.
After synthesis of molecular sieve process lead waste water, recovery method is: utilize saturated NaCl solution to resolve molecular sieve, refilters to dry to reclaim molecular sieve, and recovering effect first pass more than 92%, second reaches more than 99% throughout the 3rd time; Utilize saturated NaS solution and filtered liquid to react and reclaim heavy metal lead.Molecular sieve analysis condition is that the saturated NaCl solution of normal temperature 500ml resolves 1g molecular sieve 30min.
Utilize XRD, a series of characterization method such as SEM characterizes synthesis of molecular sieve, shows well-crystallized, and pattern is positive tetrahedron micron order 4A molecular sieve.Utilize ICP to detect lead waste water, show good lead ion removal effect, the ion-exchange capacity of synthesis of molecular sieve is strong, and repeating utilization factor is good.
The invention has the advantages that: the main raw material of (1) synthesis of molecular sieve is mine tailing, siliceous height, a lot of mine tailing composition and content similar with it, synthesis of molecular sieve realizes the object of the treatment of wastes with processes of wastes against one another; (2) the good lead waste water of 4A molecular sieve ion-exchange performance of synthesizing has good treatment effect, lead ion can be removed fast within 10s and; (3) the 4A molecular sieve recovering effect synthesized is good, has well heavy multiplexing performance; (4), in building-up process, before high temperature alkali fuse, Al (0H) is added
3, the raw material NaAlSiO generated in alkali fusion process needed for Zeolite synthesis can be made
4, be conducive to reducing the time of hydrolysis and required water consumption.
Accompanying drawing explanation
Fig. 1: prepare 4A molecular sieve process lead waste water and recovery process figure with mine tailing.
Fig. 2: prepare 4A molecular sieve XRD figure with mine tailing.
Fig. 3: prepare 4A molecular sieve SEM with mine tailing and scheme.
Fig. 4: prepare 4A Size of Zeolite analysis chart with mine tailing.
Fig. 5: synthesis of molecular sieve recycles and reuses design sketch.
Embodiment
Below in conjunction with specific embodiment, technical scheme of the present invention is described further.
Embodiment 1:
Raw material is mine tailing, mainly containing SiO2, Al2O3, and the elements such as a small amount of Fe, K, Ca, Mg, Ti, P, Zn, main chemical composition following (%wt):
Mine tailing is utilized to synthesize 4A molecular sieve step:
High temperature alkali fuse: mine tailing is milled to 325 orders, mixes with certain solid Na2CO3 and solid Al (OH) 3, is placed in heat reaction again in crucible.Heating temperature is 855 DEG C, heats and is incubated 2h, and sodium carbonate and silicon-dioxide quality are than being 1:1.2, and silicon-dioxide and alumina molar ratio are 2.
Add water ageing: the sample ore after above-mentioned steps adds water and stirs ageing 20h.Ore deposit and quality are than being 1:8.
Heating crystalline: the sample ore after above-mentioned is placed in reactor, heating is held for some time also.Temperature is 100 DEG C, and the time is 5h.
Washing is dry: the sample ore after above-mentioned steps washes filtration with water, 50 DEG C of dry 5h.
The molecular sieve of synthesis is carried out XRD, SEM to detect and sreen analysis, XRD detected result shows that it is 4A molecular sieve, and purity is higher.SEM shows synthesis of molecular sieve and is mainly cubes crystalline structure, crystallization effect, even particle distribution.Granularity Detection result display synthesis of molecular sieve granularity is micron order, and median size is 5 μm.
Be pH by the molecular sieve process lead waste water suitable condition of above-mentioned synthesis be 4.6, the treatment time is within 10s, and loading capacity is 150mg/g.Treating processes is: the lead waste water 200ml getting 0.12g molecular sieve process 100mg/L, measure plumbum ion concentration after 1h, plumbum ion concentration drops to below 0.5mg/L, reaches discharging standards.
By the molecular sieve after process, carry out parsing and reclaim, step is:
Get synthesis of molecular sieve molecular sieve 0.24g, the lead waste water 200ml of process 200mg/L, absorption 10min, surveys strength of solution.To the waste water filtering of molecular sieve be added, get appropriate NaCl saturated solution, rinse molecular sieve, refilter washing, at 60 DEG C dry 5 hours for subsequent use.
Enough NaS solids are added in filtered liquid by after the washing of NaCl saturated solution, after forming black precipitate, filtered and recycled PbS solid.
By plumbous with the divalence of concentration same volume for the molecular sieve process after resolving, after absorption 1h, survey strength of solution, repeat 4 times altogether.
Washings utilizes NaS solution washing, filtered and recycled PbS solid.
ICP is utilized to measure the content of lead ion in solution, result display first time molecular sieve recycling effect is original 71.2%, the utilizing status of second time molecular sieve is primary 99.9%, and third time is secondary 93.8%, shows good recycling effect.
Embodiment 2:
Raw material is mine tailing, mainly containing SiO2, Al2O3, and the elements such as a small amount of Fe, K, Ca, Mg, Ti, P, Zn, main chemical composition following (%wt):
Mine tailing is utilized to synthesize 4A molecular sieve step:
High temperature alkali fuse: mine tailing is milled to 325 orders, mixes with certain solid Na2CO3 and solid Al (OH) 3, is placed in heat reaction again in crucible.Heating temperature is 855 DEG C, heats and is incubated 2h, and sodium carbonate and silicon-dioxide quality are than being 1:1.2, and silicon-dioxide and alumina molar ratio are 2.
Add water ageing: the sample ore after above-mentioned steps adds water and stirs ageing 20h.Ore deposit and quality are than being 1:8.
Heating crystalline: the sample ore after above-mentioned is placed in reactor, heating is held for some time also.Temperature is 100 DEG C, and the time is 5h.
Washing is dry: the sample ore after above-mentioned steps washes filtration with water, 50 DEG C of dry 5h.
The molecular sieve of synthesis is carried out XRD, SEM to detect and sreen analysis, XRD detected result shows that it is 4A molecular sieve, and purity is higher.SEM shows synthesis of molecular sieve and is mainly cubes crystalline structure, crystallization effect, even particle distribution.Granularity Detection result display synthesis of molecular sieve granularity is micron order, and median size is 5 μm.
Be pH by the molecular sieve process lead waste water suitable condition of above-mentioned synthesis be 4.6, the treatment time is within 10s, and loading capacity is 200mg/g.Treating processes is: the lead waste water 200ml getting 0.12g molecular sieve process 100mg/L, measure plumbum ion concentration after 1h, plumbum ion concentration drops to below 0.5mg/L, reaches discharging standards.
By the molecular sieve after process, carry out parsing and reclaim, step is:
Get synthesis of molecular sieve molecular sieve 0.24g, the lead waste water 200ml of process 200mg/L, absorption 10min, surveys strength of solution.To the waste water filtering of molecular sieve be added, get appropriate NaCl saturated solution, rinse molecular sieve, refilter washing, at 60 DEG C dry 5 hours for subsequent use.
Enough NaS solids are added in filtered liquid by after the washing of NaCl saturated solution, after forming black precipitate, filtered and recycled PbS solid.
By plumbous with the divalence of concentration same volume for the molecular sieve process after resolving, after absorption 1h, survey strength of solution, repeat 4 times altogether.
Washings utilizes NaS solution washing, filtered and recycled PbS solid.
ICP is utilized to measure the content of lead ion in solution, result display first time molecular sieve recycling effect is original 72.8%, the utilizing status of second time molecular sieve is primary 99.9%, and third time is secondary 93.6%, shows good recycling effect.
Embodiment 3:
Raw material is mine tailing, mainly containing SiO2, Al2O3, and the elements such as a small amount of Fe, K, Ca, Mg, Ti, P, Zn, main chemical composition following (%wt):
Mine tailing is utilized to synthesize 4A molecular sieve step:
High temperature alkali fuse: mine tailing is milled to 325 orders, mixes with certain solid Na2CO3 and solid Al (OH) 3, is placed in heat reaction again in crucible.Heating temperature is 855 DEG C, heats and is incubated 2h, and sodium carbonate and silicon-dioxide quality are than being 1:1.2, and silicon-dioxide and alumina molar ratio are 2.
Add water ageing: the sample ore after above-mentioned steps adds water and stirs ageing 20h.Ore deposit and quality are than being 1:8.
Heating crystalline: the sample ore after above-mentioned is placed in reactor, heating is held for some time also.Temperature is 100 DEG C, and the time is 5h.
Washing is dry: the sample ore after above-mentioned steps washes filtration with water, 50 DEG C of dry 5h.
The molecular sieve of synthesis is carried out XRD, SEM to detect and sreen analysis, XRD detected result shows that it is 4A molecular sieve, and purity is higher.SEM shows synthesis of molecular sieve and is mainly cubes crystalline structure, crystallization effect, even particle distribution.Granularity Detection result display synthesis of molecular sieve granularity is micron order, and median size is 5 μm.
Be pH by the molecular sieve process lead waste water suitable condition of above-mentioned synthesis be 4.6, the treatment time is within 10s, and loading capacity is 198mg/g.Treating processes is: the lead waste water 200ml getting 0.12g molecular sieve process 100mg/L, measure plumbum ion concentration after 1h, plumbum ion concentration drops to below 0.5mg/L, reaches discharging standards.
By the molecular sieve after process, carry out parsing and reclaim, step is:
Get synthesis of molecular sieve molecular sieve 0.24g, the lead waste water 200ml of process 200mg/L, absorption 10min, surveys strength of solution.To the waste water filtering of molecular sieve be added, get appropriate NaCl saturated solution, rinse molecular sieve, refilter washing, at 60 DEG C dry 5 hours for subsequent use.
Enough NaS solids are added in filtered liquid by after the washing of NaCl saturated solution, after forming black precipitate, filtered and recycled PbS solid.
By plumbous with the divalence of concentration same volume for the molecular sieve process after resolving, after absorption 1h, survey strength of solution, repeat 4 times altogether.
Washings utilizes NaS solution washing, filtered and recycled PbS solid.
ICP is utilized to measure the content of lead ion in solution, result display first time molecular sieve recycling effect is original 73.2%, the utilizing status of second time molecular sieve is primary 99.9%, and third time is secondary 92.9%, shows good recycling effect.
Claims (7)
1. prepare a method for 4A molecular sieve with mine tailing, it is characterized in that, after mine tailing is milled to certain particle size by the method, then with a certain amount of solid Na
2cO
3with solid Al (OH)
3mixing, through high temperature alkali fuse-add water ageing-heating crystalline-washing and drying, obtains having cubes crystalline structure, the 4A molecular sieve of even particle distribution.
2. method according to claim 1, is characterized in that, the method specifically comprises the following steps:
Step 1. high temperature alkali fuse: a certain amount of mine tailing is milled to 325 orders, with certain solid Na
2cO
3with solid Al (OH)
3mixing, be placed in heat reaction again in crucible, Heating temperature is 840-860 DEG C, heats and is incubated 1.8-2.2h, obtaining sample ore, for subsequent use;
Step 2. adds water ageing: the sample ore that step 1 obtains adds water and stirs ageing 25-35min, isolates sample ore; Wherein, sample ore and quality are than being 1:5-1:10;
Step 3. heating crystalline: the sample ore after step 2 processes is placed in reactor is 100 DEG C-120 DEG C in temperature, and the time is 3-5h;
Step 4: washing is dry: wash the sample ore after step 3 processes with water filtration, dry 5h at temperature is 45-60 DEG C, namely obtain having cubes crystalline structure, the 4A molecular sieve of even particle distribution.
3. method according to claim 1, is characterized in that, in described step 1: sodium carbonate and the silicon-dioxide quality in mine tailing are than being 1:0.8-1:1.2, and the silicon-dioxide in mine tailing and alumina molar ratio are 2.
4. method according to claim 1, is characterized in that, SiO in described mine tailing
2containing more than 50%, Al
2o
3containing 5%-20%, surplus is Fe
2o
3, K
2the impurity of O, CaO, MgO and Ti, P, Zn trace element.
5. method according to claim 1, is characterized in that, described in the 4A molecular sieve for preparing there is cubes crystalline structure, even particle distribution, and loading capacity is 100mg/g-200mg/g.
6. an application for the 4A molecular sieve as described in claim 1-5 any one, is characterized in that, described 4A molecular sieve is applied in process lead waste water.
7. one kind as recovery method after the 4A molecular sieve process lead waste water of claim as described in claim 1-5 any one, it is characterized in that, specifically comprise the following steps: utilize saturated NaCl solution to resolve 4A molecular sieve, refilter and dry back 4A molecular sieve, recovering effect first pass more than 92%, second reaches more than 93% throughout the 3rd time; Utilize saturated NaS solution and filtered liquid to react and reclaim heavy metal lead; Wherein, described analysis condition: adopt the saturated NaCl solution of 500ml to resolve the 4A molecular sieve of 1g at normal temperatures, the parsing time is 30min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510691372.8A CN105271297A (en) | 2015-10-22 | 2015-10-22 | Method for preparing 4A molecular sieves by using tailings and application of 4A molecular sieves |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510691372.8A CN105271297A (en) | 2015-10-22 | 2015-10-22 | Method for preparing 4A molecular sieves by using tailings and application of 4A molecular sieves |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105271297A true CN105271297A (en) | 2016-01-27 |
Family
ID=55141236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510691372.8A Pending CN105271297A (en) | 2015-10-22 | 2015-10-22 | Method for preparing 4A molecular sieves by using tailings and application of 4A molecular sieves |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105271297A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107758681A (en) * | 2017-11-21 | 2018-03-06 | 北京科技大学 | NaOH and Na2CO3The method for mixing alkali fusion flyash synthesis 4A type molecular sieves |
| CN110452703A (en) * | 2019-08-28 | 2019-11-15 | 孙毅 | One heavy metal species normal temperature cure agent and the method for using heavy metal in its curing heavy metal pollutant |
| CN111908484A (en) * | 2020-07-10 | 2020-11-10 | 广东石油化工学院 | 4A molecular sieve and preparation method and application thereof |
| CN116440884A (en) * | 2023-03-30 | 2023-07-18 | 河南理工大学 | Lead/copper-containing mining acidic wastewater treatment agent and preparation method and application thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1267641A (en) * | 1999-03-15 | 2000-09-27 | 中国地质大学（北京） | Technology of applying 13x zeolite in treating heavy metal-containing waste water and recovering metal |
| CN1346794A (en) * | 2001-09-24 | 2002-05-01 | 复旦大学 | High-temp alkali fusing-hydrothermal crystallizing process for preparing A-type zeolite from coal gangue |
| US20060140853A1 (en) * | 2004-12-27 | 2006-06-29 | Council Of Scientific And Industrial Research | Process for preparing detergent builder zeolite-a from kimberlite tailings |
| CN101090864A (en) * | 2004-12-30 | 2007-12-19 | 科学与工业研究委员会 | Process for preparing detergent builder zeolite - A from kimberlite tailings |
-
2015
- 2015-10-22 CN CN201510691372.8A patent/CN105271297A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1267641A (en) * | 1999-03-15 | 2000-09-27 | 中国地质大学（北京） | Technology of applying 13x zeolite in treating heavy metal-containing waste water and recovering metal |
| CN1346794A (en) * | 2001-09-24 | 2002-05-01 | 复旦大学 | High-temp alkali fusing-hydrothermal crystallizing process for preparing A-type zeolite from coal gangue |
| US20060140853A1 (en) * | 2004-12-27 | 2006-06-29 | Council Of Scientific And Industrial Research | Process for preparing detergent builder zeolite-a from kimberlite tailings |
| CN101090864A (en) * | 2004-12-30 | 2007-12-19 | 科学与工业研究委员会 | Process for preparing detergent builder zeolite - A from kimberlite tailings |
Non-Patent Citations (1)
| Title |
|---|
| 石飞: "分子筛去除水中重金属离子Pb2+及其吸附机理研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107758681A (en) * | 2017-11-21 | 2018-03-06 | 北京科技大学 | NaOH and Na2CO3The method for mixing alkali fusion flyash synthesis 4A type molecular sieves |
| CN110452703A (en) * | 2019-08-28 | 2019-11-15 | 孙毅 | One heavy metal species normal temperature cure agent and the method for using heavy metal in its curing heavy metal pollutant |
| CN111908484A (en) * | 2020-07-10 | 2020-11-10 | 广东石油化工学院 | 4A molecular sieve and preparation method and application thereof |
| CN116440884A (en) * | 2023-03-30 | 2023-07-18 | 河南理工大学 | Lead/copper-containing mining acidic wastewater treatment agent and preparation method and application thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Murukutti et al. | Synthesis of nano-crystalline zeolite-A and zeolite-X from Indian coal fly ash, its characterization and performance evaluation for the removal of Cs+ and Sr2+ from simulated nuclear waste | |
| Cardoso et al. | Synthesis of zeolite Na-P1 under mild conditions using Brazilian coal fly ash and its application in wastewater treatment | |
| CN104291349B (en) | A kind of take flyash as the method that P type molecular sieve prepared by raw material | |
| CN104495899B (en) | A kind of carbide slag and flyash work in coordination with the method for recycling | |
| Chunfeng et al. | Evaluation of zeolites synthesized from fly ash as potential adsorbents for wastewater containing heavy metals | |
| Zhang et al. | Utilization of iron ore tailing for the synthesis of zeolite A by hydrothermal method | |
| CN105271297A (en) | Method for preparing 4A molecular sieves by using tailings and application of 4A molecular sieves | |
| Rozhkovskaya et al. | Synthesis of high-quality zeolite LTA from alum sludge generated in drinking water treatment plants | |
| AU2020102183A4 (en) | Preparation of zeolite 4a from tailings and method for treatment of pb-containing wastewater | |
| CN101077777B (en) | Method for preparing white carbon black from secondary carbon component | |
| CN102627305B (en) | Method using alkaline process to extract alumina in coal ash | |
| CN101811712A (en) | Method for preparing metallurgical-grade aluminum oxide by using fluid-bed fly ash | |
| CN103861567A (en) | Preparation method of hydroxyapatite/bagasse active carbon | |
| CN104817099B (en) | The method that the solid fluorine reconstruct lepidolite of a kind of improvement extracts alkali metal compound | |
| CN104445311A (en) | Clean poly-generation preparation method for flyash with high-content silicon dioxide | |
| CN103349960A (en) | Method for preparing uranium adsorption material with intercalation structure by use of oil shale ash as raw material | |
| Su et al. | Preparation of potassium sulfate and zeolite NaA from K-feldspar by a novel hydrothermal process | |
| CN114425549B (en) | Method for microwave hydrothermal detoxification and synchronous synthesis of tobermorite by using waste incineration fly ash | |
| CN110394350A (en) | A method of recycling aluminium ash valuable component | |
| CN102502722A (en) | Preparation method of high-purity magnesium oxide | |
| CN114180603A (en) | Method for producing active magnesium oxide from waste residues of spices | |
| CN105731486A (en) | Method for preparing spherical analcite mesoporous material by using low-quality attapulgite clay tailings | |
| CN103253681B (en) | Method for preparing Na-A/X or Na-A/X/P cocrystallized molecular sieve by lithium slag hydrothermal synthesis | |
| Wang et al. | A clean method for gallium recovery and the coproduction of silica-potassium compound fertilizer and zeolite F from brown corundum fly ash | |
| Zhao et al. | Efficient separation and comprehensive extraction of aluminum, silicon, and iron from coal fly ash by a cascade extraction method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160127 |