CN106345398A - Preparation method of modified coal ash adsorbent - Google Patents

Preparation method of modified coal ash adsorbent Download PDF

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Publication number
CN106345398A
CN106345398A CN201610815115.5A CN201610815115A CN106345398A CN 106345398 A CN106345398 A CN 106345398A CN 201610815115 A CN201610815115 A CN 201610815115A CN 106345398 A CN106345398 A CN 106345398A
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China
Prior art keywords
ball
preparation
coal ash
flyash
fly ash
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Pending
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CN201610815115.5A
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Chinese (zh)
Inventor
张莉
杜险峰
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Wuhan Institute of Technology
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Wuhan Institute of Technology
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Priority to CN201610815115.5A priority Critical patent/CN106345398A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
    • B01J20/103—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate comprising silica
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/105—Phosphorus compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/12—Halogens or halogen-containing compounds
    • C02F2101/14—Fluorine or fluorine-containing compounds

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Analytical Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The invention discloses a preparation method of modified coal ash adsorbent. The preparation method includes the steps of pretreatment of coal ash, namely cleaning the coal ash with distilled water and filtering the coal ash to obtain the coal ash subjected to the pretreatment; ball-milling treatment, namely placing the coal ash in a ball-milling pot, adding water to form a sizing agent prior to adding milling balls; after ball milling, filtering to obtain the coal ash subjected to ball milling; salt solution treatment, namely adding the coal ash into a salt solution prior to soaking, pump filtering, cleaning and drying to obtain the modified coal ash adsorbent. The preparation method has the advantages that new path for comprehensive utilization of resources of the coal ash is widened, source of raw materials of high valued-added adsorbent is expanded, waste resource recovery is realized by using waste to treat waste, the modified coal ash adsorbent prepared with the method is less in adsorbent dosage as compared with an ordinary coal ash adsorbent, obvious in adsorbent effect, less in adsorbent time and the like.

Description

A kind of preparation method of modified fly ash absorbent
Technical field
Field of material technology of the present invention is and in particular to a kind of method to prepare adsorbent for raw material with flyash.
Background technology
Flyash is a kind of granule garbage of coal-burning power plant's pulverized coal friring discharge, and its main chemical composition is sio2, al2o3, fe2o3And a small amount of cao, mgo, so2Deng.China is a country being mainly the disposable energy with coal, coal-fired Power plant will produce substantial amounts of flyash every year, and a large amount of soils are not only occupied in the discharge of flyash, and serious environment pollution, such as Flyash is turned waste into wealth and is used by what, has become as in recent years one of research and development focus of field of Environment Protection both at home and abroad.
Flyash has big surface area and porous, has good absorption and settling property, is given up using flyash The process of water, can play the treatment of wastes with processes of wastes against one another, cost-effective purpose.But the adsorption capacity of flyash itself is not high, directly The shortcomings of adsorption rate ratio is relatively low, and process time is long, consumption is big can be caused using Coal Ash Treating Wastewater.Therefore improve flyash Adsorption capacity becomes the key for being applied to field of waste water treatment, is to improve Powder ash adsorption capacity and absorption by modification Rate, reduces a kind of effective ways of process time and flyash consumption.
Conventional method of modifying can be divided into two big class: one is pyrogenic process, is by flyash and flux according to a certain percentage Melt at high temperature after mixing, so that flyash is decomposed；Two is wet method, mainly by the effect of strong acid and strong base, opens flyash Blind bore road, increases the specific surface area and porosity of flyash with this.Method of modifying the most frequently used at present has acid modification, alkali to change Property, modified, the surfactant-modified, synthetic zeolite from flyash of salt etc..
Content of the invention
Present invention aim at providing total phosphorus and fluorion in a kind of waste water to phosphoric acid to have especially good adsorption effect and change Property coal ash for manufacturing Preparation Method.
For reaching above-mentioned purpose, as follows using technical scheme:
A kind of preparation method of modified fly ash absorbent, comprises the following steps:
1) flyash pretreatment: flyash is cleaned with distilled water, filters, obtain pretreated flyash；
2) ball-milling treatment: by step 1) gained flyash is placed in ball grinder, adds water and make slurry, adds abrading-ball；Ball milling After the completion of, filter, obtain the flyash after ball milling；
3) saline solution is processed: by step 2) gained flyash addition saline solution, soaks, sucking filtration, washing, is changed after drying Property fly ash absorbent.
By such scheme, step 2) concentration of slurry is 20-40wt%.
By such scheme, step 2) mass ratio of the volume of slurry and abrading-ball is (6-12): 1ml/g.
By such scheme, step 2) Ball-milling Time be 60min-180min.
By such scheme, step 2) rotational speed of ball-mill be 300r/min-500r/min.
By such scheme, step 3) described saline solution be iron salt solutions.
By such scheme, step 3) described saline solution ferric chloride solution.
By such scheme, step 3) described concentration of salt solution 0.02mol/l-0.1mol/l；Flyash quality and saline solution The ratio of volume is (2-7): 10g/ml.
By such scheme, step 3) soak time be 5min-30min.
With respect to prior art, the present invention has the beneficial effect that:
The present invention, with flyash as raw material, is modified to it by ball milling and certain salt, has obtained a kind of modified coal ash Adsorbent, this adsorbent can process phosphoric acid industry waste water, goes the effect is significant of Natural zeolite and total phosphorus.
Ball milling makes flyash particle diameter diminish, and specific surface area becomes big, in the same time, can have more molecule contacts thus There is absorption so that absorption is faster more abundant.The modification of iron salt make the ferrum of fly ash grain surface adsorption more amount from Son, the electropositive due to surface particles increases, and the electrostatic attraction to anion in water body strengthens.Further, since the wadding of iron ion Solidifying settlement action, clearance also increases.
The present invention has widened the new way of fly ash comprehensive utilization, and the raw material expanding high added value adsorbent comes Source, realizes changing rejected material to useful resource, the treatment of wastes with processes of wastes against one another, to realize recycling economy and energy-saving and emission-reduction play the role of very positive, and The modified fly ash absorbent of present invention preparation has than common flyash that adsorbent amount is few, adsorption effect notable, absorption The features such as time is few.
Specific embodiment
Embodiment 1
Pretreated flyash is positioned in ball grinder, adds water, be configured to 20% slurry, then press ratio of grinding media to material 6:1 Add abrading-ball, ball milling 60min under 300r/min rotational speed of ball-mill, filter, obtain the flyash after ball milling；By the fine coal after ball milling 5:10 (acid modified flyash quality g: saline solution volume ml) is added to the ferric chloride solution of 0.02mol/l to ash in proportion In, after soaking 5min, sucking filtration, rinses 3 times, dries, obtain modified fly ash absorbent.Modified fly ash absorbent by 0.4g Put in the phosphoric acid waste water (total phosphorus concentration is 50mg/l, and fluorinion concentration is 19mg/l) of 50ml, adsorb 30min.Now, always The clearance of phosphorus is 94.2%, and the clearance of fluorion is 90.8%.
Comparative example 1:
By pretreated flyash, 5:10 (modified flyash quality g: saline solution volume ml of acid) adds in proportion To in the ferric chloride solution of 0.02mol/l, after soaking 5min, sucking filtration, rinses 3 times, dries, obtain modified fly ash absorbent. The modified fly ash absorbent of 0.4g is put into the phosphoric acid waste water of 50ml, and (total phosphorus concentration is 50mg/l, and fluorinion concentration is In 19mg/l), adsorb 30min.Now, the clearance of total phosphorus is 54.2%, and the clearance of fluorion is 48.7%.
Comparative example 2
Pretreated flyash is positioned in ball grinder, adds water, be configured to 20% slurry, then press ratio of grinding media to material 6:1 Add abrading-ball, ball milling 60min under 300r/min rotational speed of ball-mill, filter, obtain the flyash after ball milling and dry.By 0.4g's Modified fly ash absorbent is put in the phosphoric acid waste water (total phosphorus concentration is 50mg/l, and fluorinion concentration is 19mg/l) of 50ml, Absorption 30min.Now, the clearance of total phosphorus is 61.5%, and the clearance of fluorion is 58.9%.
Embodiment 2
Pretreated flyash is positioned in ball grinder, adds water, be configured to 30% slurry, then press ratio of grinding media to material 12:1 Add abrading-ball, ball milling 90min under 500r/min rotational speed of ball-mill, filter, obtain the flyash after ball milling；By the fine coal after ball milling 2:10 (acid modified flyash quality g: saline solution volume ml) is added to the ferric chloride solution of 0.05mol/l to ash in proportion In, after soaking 15min, sucking filtration, rinses 3 times, dries, obtain modified fly ash absorbent.Modified coal ash absorption by 0.4g Agent is put in the phosphoric acid waste water (total phosphorus concentration is 50mg/l, and fluorinion concentration is 19mg/l) of 50ml, adsorbs 30min.Now, The clearance of total phosphorus is 90.7%, and the clearance of fluorion is 89.2%.
Embodiment 3
Pretreated flyash is positioned in ball grinder, adds water, be configured to 40% slurry, then press ratio of grinding media to material 10:1 Add abrading-ball, ball milling 120min under 450r/min rotational speed of ball-mill, filter, obtain the flyash after ball milling；By the powder after ball milling 7:10 (acid modified flyash quality g: saline solution volume ml) is added to the ferric chloride solution of 0.1mol/l to coal ash in proportion In, after soaking 30min, sucking filtration, rinses 3 times, dries, obtain modified fly ash absorbent.Modified coal ash absorption by 0.4g Agent is put in the phosphoric acid waste water (total phosphorus concentration is 50mg/l, and fluorinion concentration is 19mg/l) of 50ml, adsorbs 30min.Now, The clearance of total phosphorus is 92.7%, and the clearance of fluorion is 91.2%.
Embodiment 4
Pretreated flyash is positioned in ball grinder, adds water, be configured to 30% slurry, then press ratio of grinding media to material 10:1 Add abrading-ball, ball milling 90min under 450r/min rotational speed of ball-mill, filter, obtain the flyash after ball milling；By the fine coal after ball milling 5:10 (modified flyash quality g: saline solution volume ml of acid) is added in the ferric chloride solution of 0.1mol/l ash in proportion, After soaking 30min, sucking filtration, rinses 3 times, dries, obtain modified fly ash absorbent.The modified fly ash absorbent of 0.4g is thrown Enter in the phosphoric acid waste water to 50ml (total phosphorus concentration is 50mg/l, and fluorinion concentration is 19mg/l), adsorb 30min.Now, total phosphorus Clearance be 96.7%, the clearance of fluorion is 92.2%.
Each raw material cited by the present invention can realize the present invention, and each raw material bound value, interval value can Realize the present invention；Embodiment numerous to list herein.The bound value of technological parameter (as ratio, time etc.) of the present invention, Interval value can realize the present invention, embodiment numerous to list herein.

Claims (9)

1. a kind of preparation method of modified fly ash absorbent is it is characterised in that comprise the following steps:
1) flyash pretreatment: flyash is cleaned with distilled water, filters, obtain pretreated flyash；
2) ball-milling treatment: by step 1) gained flyash is placed in ball grinder, adds water and make slurry, adds abrading-ball；Ball milling completes Afterwards, filter, obtain the flyash after ball milling；
3) saline solution is processed: by step 2) gained flyash addition saline solution, soaks, sucking filtration, washing, obtains modified powder after drying Coal Ash Adsorption agent.
2. the preparation method of modified fly ash absorbent as claimed in claim 1 is it is characterised in that step 2) concentration of slurry is 20-40wt%.
3. the preparation method of modified fly ash absorbent as claimed in claim 1 is it is characterised in that step 2) volume of slurry and The mass ratio of abrading-ball is (6-12): 1ml/g.
4. the preparation method of modified fly ash absorbent as claimed in claim 1 is it is characterised in that step 2) Ball-milling Time is 60min-180min.
5. the preparation method of modified fly ash absorbent as claimed in claim 1 is it is characterised in that step 2) rotational speed of ball-mill is 300r/min-500r/min.
6. the preparation method of modified fly ash absorbent as claimed in claim 1 is it is characterised in that step 3) described saline solution is Iron salt solutions.
7. the preparation method of modified fly ash absorbent as claimed in claim 1 is it is characterised in that step 3) described saline solution chlorine Change ferrous solution.
8. the preparation method of modified fly ash absorbent as claimed in claim 1 is it is characterised in that step 3) described saline solution is dense Degree 0.02mol/l-0.1mol/l；The ratio of flyash quality and saline solution volume is (2-7): 10g/ml.
9. the preparation method of modified fly ash absorbent as claimed in claim 1 is it is characterised in that step 3) soak time is 5min-30min.
CN201610815115.5A 2016-09-12 2016-09-12 Preparation method of modified coal ash adsorbent Pending CN106345398A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107376829A (en) * 2017-08-28 2017-11-24 云南圣清环保科技有限公司 A kind of preparation method for carrying iron powder coal ash arsenic-removing adsorption agent
CN108325500A (en) * 2018-03-01 2018-07-27 合肥峰腾节能科技有限公司 A kind of air purifying preparation and preparation method thereof
CN108530209A (en) * 2018-07-04 2018-09-14 合肥申沃园艺有限公司 It is a kind of based on coal gangue modified compound fertilizer and preparation method thereof
US10882022B2 (en) 2018-08-07 2021-01-05 King Abdulaziz University Method of removing organic pollutants from water using ball milled and sonicated oil fly ash powder
CN112915973A (en) * 2021-01-27 2021-06-08 广州珠江电力有限公司 Modified fly ash adsorbent and preparation method and application thereof

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CN104209088A (en) * 2014-09-24 2014-12-17 陕西华陆化工环保有限公司 Preparation method of modified fly ash used for absorbing nitrophenol in waste water

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Publication number Priority date Publication date Assignee Title
US20070140940A1 (en) * 2005-12-15 2007-06-21 The United States Of America, As Represented By The Administrator Of The U.S. Environ. Agcy. Compositions and methods for removing mercury from mercury-containing fluids
CN104209088A (en) * 2014-09-24 2014-12-17 陕西华陆化工环保有限公司 Preparation method of modified fly ash used for absorbing nitrophenol in waste water

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107376829A (en) * 2017-08-28 2017-11-24 云南圣清环保科技有限公司 A kind of preparation method for carrying iron powder coal ash arsenic-removing adsorption agent
CN108325500A (en) * 2018-03-01 2018-07-27 合肥峰腾节能科技有限公司 A kind of air purifying preparation and preparation method thereof
CN108530209A (en) * 2018-07-04 2018-09-14 合肥申沃园艺有限公司 It is a kind of based on coal gangue modified compound fertilizer and preparation method thereof
US10882022B2 (en) 2018-08-07 2021-01-05 King Abdulaziz University Method of removing organic pollutants from water using ball milled and sonicated oil fly ash powder
US11110429B1 (en) 2018-08-07 2021-09-07 King Abdulaziz University Method for removing polycyclic aromatic hydrocarbons from water using ball milled and sonicated oil fly ash powder
US11135563B1 (en) 2018-08-07 2021-10-05 King Abdulaziz University Method for making a water treatment adsorbent filter
US11154837B2 (en) 2018-08-07 2021-10-26 King Abdulaziz University Method for making absorbent oil fly ash powder
CN112915973A (en) * 2021-01-27 2021-06-08 广州珠江电力有限公司 Modified fly ash adsorbent and preparation method and application thereof

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Application publication date: 20170125