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A heavy metal adsorbent based on alkali slag recycling and its preparation method and application

A heavy metal and adsorbent technology, applied in the directions of alkali metal compounds, alkali metal oxides/hydroxides, chemical instruments and methods, etc., can solve the problems of non-recyclable, complex composition of alkali slag, poor adsorption effect, etc. Treatment cost, obvious adsorption and fixation effect, simple material effect

Active Publication Date: 2020-12-11
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the complex composition and strong alkalinity of the alkali slag, it is very difficult to really use it.
At the same time, some researchers use alkali slag as an adsorbent to remove heavy metals. Most of them directly adsorb heavy metals through acid-base modification of alkali slag. The problem of secondary pollution, and the resource reuse of alkali slag cannot be realized in the true sense

Method used

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  • A heavy metal adsorbent based on alkali slag recycling and its preparation method and application
  • A heavy metal adsorbent based on alkali slag recycling and its preparation method and application

Examples

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Effect test

Embodiment 1

[0042] A heavy metal adsorbent based on alkali slag recycling and a preparation method thereof, comprising the following steps:

[0043] (1) Weigh a certain amount of alkali slag, dissolve it in water after crushing, stir it into a slurry and pass it through a 100-mesh sieve to remove insoluble matter, let it stand overnight for 12 hours, remove the supernatant and put it in a dryer at 60°C for 10 hours. Get pretreated dehydrated alkali slag.

[0044] (2) Dissolve 12 g of pretreated dehydrated alkali slag in 200 ml of water, stir for 4 hours to form a slurry, add 2 g of ferric oxide powder with a particle size of 100 nm, and continue stirring to obtain a mixed solution.

[0045] (3) After adding sodium carbonate and hydrochloric acid (concentration of 0.1 mol / L) to the mixed solution to adjust the pH value of the mixed solution to 10, fully react for 20 minutes.

[0046] (4) Add 8 g of sodium alginate to the mixed solution, and stir evenly to obtain a gel mixed solution syste...

Embodiment 2

[0052] A heavy metal adsorbent based on alkali slag recycling and a preparation method thereof, comprising the following steps:

[0053] (1) Weigh a certain amount of alkali slag, dissolve it in water after crushing, stir it into a slurry and pass it through a 100-mesh sieve to remove insoluble matter, let it stand overnight for 10 hours, remove the supernatant and put it in a dryer at 60°C for 12 hours. Get pretreated dehydrated alkali slag.

[0054] (2) Take 10 g of the pretreated dehydrated alkali residue and fully dissolve it in 200 ml of water, stir for 4 hours to form a slurry, add 2 g of ferric oxide powder with a particle size of 90 nm, and continue to stir evenly to obtain a mixed solution.

[0055] (3) Add sodium carbonate and hydrochloric acid (concentration: 0.1 mol / L) to the mixed solution to adjust the pH value of the mixed solution to 9, and react fully for 20 minutes.

[0056] (4) Add 6 g of sodium alginate to the mixed solution, and stir evenly to obtain a ge...

Embodiment 3

[0062] A heavy metal adsorbent based on alkali slag recycling and a preparation method thereof, comprising the following steps:

[0063] (1) Weigh a certain amount of alkali slag, dissolve it in water after crushing, stir it into a slurry and pass it through a 200-mesh sieve to remove insoluble matter, let it stand overnight for 16 hours, remove the supernatant and put it in a dryer at 60°C for 12 hours. Obtain pretreatment dehydration alkali slag;

[0064] (2) Dissolve 16 g of the pretreated dehydrated alkali slag in 200 ml of water, stir for 4 hours to form a slurry, add 3 g of ferric oxide powder with a particle size of 90 nm, and continue stirring to obtain a mixed solution.

[0065] (3) Add sodium carbonate and hydrochloric acid (concentration: 0.1 mol / L) to the mixed solution to adjust the pH value of the mixed solution to 9, and react fully for 20 minutes.

[0066] (4) Add 8 g of sodium alginate to the mixed solution, and stir evenly to obtain a gel mixed solution syst...

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Abstract

The invention discloses a recycling heavy metal adsorbent based on alkali slag and a preparation method and application thereof. An adsorbent material capable of cyclically adsorbing heavy metals is prepared by the alkali slag and an alginate, and is applied to removal of heavy metals in a water body, a range of resource utilization of the alkali slag is opened up, and a new way for utilization ofthe alkali slag is opened up. At the same time, the prepared adsorbent has magnetism and porosity, the alkali slag material has the efficient heavy metal adsorption ability, is light in weight, can float on the water surface, and is convenient to recycle, and thereby the purpose of removing the heavy metals in the water body is achieved. The material has a wide application range, and can be usedfor restoration of the heavy metal polluted water body such as urban or industrial sewage, rivers, ponds and lakes.

Description

technical field [0001] The invention belongs to the technical field of adsorbing heavy metal materials and environmental protection, and in particular relates to a heavy metal adsorbent based on alkali slag recycling and its preparation method and application. Background technique [0002] my country is the world's largest producer of soda ash. The soda ash produced by the ammonia-soda method produces a large amount of waste every year. Because of its high alkali value (pH is 10-12) and its main component is CaCl 2 , CaCO 3 , chloride ions, etc. At present, there is no effective method to deal with them at home and abroad, and most manufacturers of alkali slag mainly use stockpiling or reclamation. It not only occupies a large amount of land resources, but also alkalizes the soil and pollutes water bodies, causing great environmental problems. The sea area occupied by alkali slag deposition forms a "white sea", which poses a safety hazard. Many enterprises at home and abro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28
CPCB01J20/0229B01J20/24B01J20/28047C02F1/28
Inventor 蒋刚彪王少杰胡甜刘永林胡汉剑
Owner SOUTH CHINA AGRI UNIV
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