CN101898128A - Preparation and application method of aluminum modified red mud defluorinating absorbent - Google Patents
Preparation and application method of aluminum modified red mud defluorinating absorbent Download PDFInfo
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- CN101898128A CN101898128A CN2009100847074A CN200910084707A CN101898128A CN 101898128 A CN101898128 A CN 101898128A CN 2009100847074 A CN2009100847074 A CN 2009100847074A CN 200910084707 A CN200910084707 A CN 200910084707A CN 101898128 A CN101898128 A CN 101898128A
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Abstract
The invention relates to preparation of aluminum modified red mud into a defluorinating absorbent and a defluorinating application method. The preparation is mainly characterized by adopting red mud waste slag of alumina industrial production as a raw material, modifying by utilizing acidic aluminum salt and alkali liquor, and preparing a modified red mud defluorinating absorbent by baking. The method in the invention has simple process, low cost, cleanness and harmlessness, rapid absorption speed, large saturated capacity, and good defluorinating effect when the pH value is neutral.
Description
Technical field
This method belongs to water-treatment technology field, relates to a kind of aluminum modified red mud preparation of adsorbent and application process.
Background technology
Fluorine element is biological required necessary trace element, and according to the WHO suggestion, the suitableeest fluoride concentration should be at 0.5～1.0mg/L in the drinking water, and the concentration that is higher than this scope may cause fluorine poisoning.China is fluoride pollution big country, and a lot of areas are owing to geological conditions or industrial pollution, fluorine concentration severe overweight in the water body.
In recent years, a lot of technologies have appearred in the removal at fluorine ion in the water body both at home and abroad, but the focus of research concentrates on absorbing process, flocculence, chemical precipitation method, ion-exchange-resin process, electrochemical process, membrane process etc. substantially.Comparatively speaking, absorption method at home and abroad is most widely used at present with its lower cost and removal effect preferably.
Sorbing material commonly used at present mainly comprises natural mineral matters such as aluminium oxide, bone carbon, zeolite etc., but the modification that most patent reports all are based on above-mentioned material to be carried out is handled, improve adsorption capacity and usefulness with it, modification prepares defluorinating agent method (patent publication No. CN101244378) as modification of chitosan; Modified montmorillonite used defluorination material preparation of aluminium and application process (patent publication No. CN1315293); The production method of modified zeolite defluoridation filter material and the defluorinating process that adapts (CN1795981) thereof, and a kind of high performance agent for removing fluorin and its production and application (CN101091903) or the like.Above-mentioned de-fluoridation adsorbent ubiquity or adsorption-defluorination poor effect, or defluorination operating cost is crossed high shortcoming.Therefore seek a kind of efficient relatively cheap de-fluoridation adsorbent and just become the task of top priority.
The abandoned mine slag that produces in the aluminum oxide production process is bronzing and is referred to as red mud because of it is rich in iron oxide (20～50%).In aluminum oxide production process, 1 ton of Al of every production
2O
3Can produce 0.5～1.2 ton abandoned mine slag, the high speed development of China's aluminum oxide industry in recent years, 2008 nearly 2,000 ten thousand tons.Red mud year, accumulating amount also reached ten thousand tons/year of 1500-2000.On the one hand, the red mud discarded object of a large amount of strong basicities, high salinity is stored up in the open, not only takies a large amount of land resources, and to soil, water body and underground water, and the regional environment air quality all causes severe contamination harm.On the other hand, contain a large amount of iron, aluminium, silicon, calcium isoreactivity metal oxide component in the red mud, be the basic raw material of preparation flocculant, adsorbent, but be not utilized effectively so far, cause the secondary waste of renewable resource.
Summary of the invention
This method is to produce red mud abandoned mine slag in the alumina by sintering production process as base stock, to handle by acid aluminium salt and alkali lye modification, the inexpensive water quality de-fluoridation adsorbent of preparation novel economizer.The object of the present invention is to provide a kind of highly active changed red mud preparation of adsorbent method and be applied to fluoride waste and handle.
1, the adsorbent preparation procedure is as follows:
1. it is standby 100 mesh sieves to be ground in initial red mud oven dry.
2. prepare 0.5-2.0mol/L AlCl
3.6H
2O solution and 0.5-1mol/LNaOH solution.
3. under the normal temperature red mud that grinds is joined AlCl gradually
3.6H
2In the O solution, and stirring with magnetic stirring apparatus is powerful, is to stop to add red mud at 3 o'clock until the pH value of solution value.Continued powerful magnetic agitation again 24 hours.
4. the red mud suspension is slowly added in this NaOH solution, the powerful stirring left standstill 12 hours after dropping to 7-8 until alkali lye pH is stable again.
5. adopt centrifugal process that this suspension is carried out Separation of Solid and Liquid then, separating solids places muffle furnace roasting 2 hours, and sintering temperature is 200-300 ℃, grinds 100 mesh sieves, obtains aluminum modified red mud defluorinating absorbent.
2, defluorination using method
Getting the fluorinated water of certain concentration of certain volume, is to add changed red mud suspending agent at 100: 1 by fluorine mass ratio in changed red mud and the water, the standing sedimentation after 2 hours that vibrates, and fluorinated volume in the water is measured in the upper clear liquid centrifugation.
The red mud raw material that this method adopted is a red mud from sintering process, and cost of material is cheap, and is simple to operate.In addition, different with the suitable acid condition of other a lot of de-fluoridation adsorbents, the aluminum modified red mud adsorbent is issued to better adsorption-defluorination effect in pH neutrality (7-8) condition.Below in conjunction with example this method is described further:
Example 1:
Get 100ml fluoride ion (5mg/L, pH is about 7.5) pending water sample, add back-ground electolyte NaCl0.01mol/L, place the 250ml conical flask, add aluminum modified red mud adsorbent 0.5g, with the velocity fluctuation of 150r/min 2 hours, centrifugal at ambient temperature, get supernatant and adopt that content of fluoride ion is 0.65mg/L in the ion-chromatographic determination supernatant, be lower than national drinking water standard 1.0mg/L.
Example 2:
Get 100ml fluoride ion (3mg/L, pH is about 7.5) pending water sample, add back-ground electolyte NaCl0.01mol/L, place the 250ml conical flask, add aluminum modified red mud adsorbent 0.3g, with the velocity fluctuation of 150r/min 2 hours, centrifugal at ambient temperature, get supernatant and adopt that content of fluoride ion is 0.92mg/L in the ion-chromatographic determination supernatant, be lower than national drinking water standard 1.0mg/L.
Claims (6)
1. an aluminum modified red mud is as the preparation and the defluorination application process of de-fluoridation adsorbent.Be primarily characterized in that: abandoned mine slag one red mud that extracts in the aluminum oxide industry production with bauxite is a raw material, invades to soak with alkali lye by the acid aluminium salt compound and handles, more a kind of new modified mud adsorbent for preparing by roasting.
2. prepare the changed red mud adsorbent according to the described method of claim 1, it is characterized in that: used aluminum salt solution is the AlCl of 0.5-2.0mol/L
3Solution.Alkali lye is the NaOH solution of 0.5-1.0mol/L.
3. prepare the changed red mud adsorbent according to the described method of claim 1, under the normal temperature an amount of red mud joined gradually above-mentioned described AlCl
3In the solution, and mix, reach at 3 o'clock until the pH value of solution value and stop with the magnetic stirring apparatus brute force.Again this suspension is added in the NaOH solution gradually after 24 hours, after alkali lye pH reduction is stabilized in 7-8, left standstill again 12 hours.
4. prepare the changed red mud adsorbent according to the described method of claim 1, its special type is: the above-mentioned suspension that staticly settles is carried out Separation of Solid and Liquid, again this centrifugal solids particle is placed muffle furnace roasting 2 hours, sintering temperature is 200-300 ℃, grind 100 mesh sieves, promptly got aluminum modified red mud defluorinating absorbent.
5. prepare the changed red mud adsorbent according to the described method of claim 1, it is characterized in that: adsorption reaction optimal pH scope is 5-8, and the adsorption reaction equilibration time is 2 hours.
6. according to the water quality de-fluoridation adsorbent of the described method preparation of claim 1, it is characterized in that: also can be used for removing As in the water
-, PO
4 3-Deng anion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100847074A CN101898128A (en) | 2009-05-25 | 2009-05-25 | Preparation and application method of aluminum modified red mud defluorinating absorbent |
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|---|---|---|---|
| CN2009100847074A CN101898128A (en) | 2009-05-25 | 2009-05-25 | Preparation and application method of aluminum modified red mud defluorinating absorbent |
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| CN101898128A true CN101898128A (en) | 2010-12-01 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102240551A (en) * | 2011-04-21 | 2011-11-16 | 山西开兴赤泥开发有限公司 | Method for preparing visible light photochemical catalyst with high specific surface area by using red mud |
| CN103071450A (en) * | 2013-01-16 | 2013-05-01 | 河海大学 | Defluorination adsorbent as well as preparation method and application thereof |
| CN103601311A (en) * | 2013-08-16 | 2014-02-26 | 崇义章源钨业股份有限公司 | Method for removing fluorine, phosphor, and arsenic from tungsten ion exchange wastewater |
| CN110589927A (en) * | 2019-09-30 | 2019-12-20 | 安徽大学 | Process method for treating fluorine-containing wastewater by using chitosan and aluminum sulfate composite modified zeolite |
| CN113020242A (en) * | 2021-03-11 | 2021-06-25 | 中铝环保生态技术(湖南)有限公司 | Fluorine-contaminated soil remediation agent and laboratory application method |
| CN115364809A (en) * | 2022-08-23 | 2022-11-22 | 长春工业大学 | Modified alumina adsorbent and preparation method thereof |
-
2009
- 2009-05-25 CN CN2009100847074A patent/CN101898128A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102240551A (en) * | 2011-04-21 | 2011-11-16 | 山西开兴赤泥开发有限公司 | Method for preparing visible light photochemical catalyst with high specific surface area by using red mud |
| CN102240551B (en) * | 2011-04-21 | 2013-04-17 | 山西开兴赤泥开发有限公司 | Method for preparing visible light photochemical catalyst with high specific surface area by using red mud |
| CN103071450A (en) * | 2013-01-16 | 2013-05-01 | 河海大学 | Defluorination adsorbent as well as preparation method and application thereof |
| CN103071450B (en) * | 2013-01-16 | 2014-11-12 | 河海大学 | Defluorination adsorbent as well as preparation method and application thereof |
| CN103601311A (en) * | 2013-08-16 | 2014-02-26 | 崇义章源钨业股份有限公司 | Method for removing fluorine, phosphor, and arsenic from tungsten ion exchange wastewater |
| CN110589927A (en) * | 2019-09-30 | 2019-12-20 | 安徽大学 | Process method for treating fluorine-containing wastewater by using chitosan and aluminum sulfate composite modified zeolite |
| CN113020242A (en) * | 2021-03-11 | 2021-06-25 | 中铝环保生态技术(湖南)有限公司 | Fluorine-contaminated soil remediation agent and laboratory application method |
| CN115364809A (en) * | 2022-08-23 | 2022-11-22 | 长春工业大学 | Modified alumina adsorbent and preparation method thereof |
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Open date: 20101201 |