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A kind of preparation method and application of adsorbent for treating zinc-containing wastewater

An adsorbent and waste water technology, applied in water/sewage treatment, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of high preparation and operation cost of composite zinc removal agent, unfavorable comprehensive utilization of waste resources, etc. Achieve good adsorption performance, increase porosity and specific surface area, and achieve high overall adsorption capacity

Inactive Publication Date: 2016-06-22
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is also expensive in the preparation and operation of the composite zinc removal agent, which is not conducive to the comprehensive utilization of waste resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Crush the phosphogypsum sample to 120 mesh, wash with deionized water three times to remove impurities in the phosphogypsum and separate to obtain purified phosphogypsum, dissolve 8g of purified phosphogypsum in 250mL saturated sodium chloride solution, prepare a suspension, and After stirring for 3 hours at 30°C, filter under reduced pressure, wash with deionized water until neutral, and dry at room temperature until the water content is less than or equal to 0.5% to obtain a sodium phosphogypsum sample;

[0020] (2) Add 8g of sodium phosphogypsum sample to 250mL of 1% Al 2 (SO 4 ) 3 In the solution, after stirring for 4 hours at 30°C, filter under reduced pressure, wash with deionized water until neutral, dry at 120°C until the water content is less than or equal to 0.5%, and then grind and pass through a 120-mesh sieve to obtain aluminum Modified phosphogypsum adsorbent;

[0021] (3) Add the adsorbent obtained in step (2) into the zinc-containing wastewater in...

Embodiment 2

[0023] (1) Crush the phosphogypsum sample to 160 mesh, wash it with deionized water for 4 times to remove impurities in the phosphogypsum and separate to obtain purified phosphogypsum, dissolve 10g of purified phosphogypsum in 250mL saturated sodium chloride solution, prepare a suspension, and After stirring for 5 hours at 35°C, filter under reduced pressure, wash with deionized water until neutral, and dry at room temperature until the water content is less than or equal to 0.5% to obtain a sodium phosphogypsum sample;

[0024] (2) Add 10g of sodium phosphogypsum sample to 250mL of 3% Al 2 (SO 4 ) 3 In the solution, after stirring for 6 hours at 35°C, filter under reduced pressure, wash with deionized water until neutral, dry at 140°C until the water content is less than or equal to 0.5%, and then grind and pass through a 160-mesh sieve to obtain aluminum Modified phosphogypsum adsorbent;

[0025] (3) Add the adsorbent obtained in step (2) into zinc-containing wastewater i...

Embodiment 3

[0027] (1) Crush the phosphogypsum sample to 180 mesh, wash 5 times with deionized water to remove impurities in the phosphogypsum and separate to obtain purified phosphogypsum. Dissolve 12g of purified phosphogypsum in 250mL saturated sodium chloride solution to prepare a suspension. After stirring for 7 hours at 40°C, filter under reduced pressure, wash with deionized water until neutral, and dry at room temperature until the water content is less than or equal to 0.5% to obtain a sodium phosphogypsum sample;

[0028] (2) Add 12g of sodium phosphogypsum sample to 250mL of 5% Al 2 (SO 4 ) 3 In the solution, after stirring at 40°C for 8 hours, filter under reduced pressure, wash with deionized water until neutral, dry at 160°C until the water content is less than or equal to 0.5%, and then grind and pass through a 180-mesh sieve to obtain aluminum Modified phosphogypsum adsorbent;

[0029] (3) Add the adsorbent obtained in step (2) into the zinc-containing wastewater in an ...

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Abstract

The invention discloses a preparation method and application of an adsorbent for treating zinc-containing waste water and belongs to the technical field of heavy metal wastewater treatment. The preparation method comprises the following steps: performing pretreatment on phosphogypsum with sodium chloride, modifying phosphogypsum by adopting an aluminium sulphate modification technology to obtain an aluminium-base-modified phosphogypsum absorbent, allowing Al <3+> entering phosphogypsum layers through an ion exchange react to prop open the layers to increase the layer distance and diameter. Micropore structures of the absorbent provided by the invention are further increased, so that the porosity rate and the specific surface area of phosphogypsum are increased, and the absorbent has better adsorption performance; the further treated phosphogypsum has a higher adsorption capacity, so that the adsorbent becomes an excellent adsorbing material for removing zinc ions.

Description

technical field [0001] The invention relates to a preparation method and application of an adsorbent for treating zinc-containing wastewater, and belongs to the technical field of heavy metal wastewater treatment. Background technique [0002] Zinc is a heavy metal resource that is abundant in the earth. my country's zinc reserves rank second in the world, and zinc resources are widely used in modern industrial production such as smelting, pharmaceutical and food industries. Zinc is an indispensable element for human health. It widely exists in human muscles and bones, but the content is very small. If it is excessive, serious consequences will occur. The main source of zinc-containing wastewater is electroplating wastewater. Its discharge has serious hazards to human health and industrial and agricultural activities. It has hazards such as persistence, high toxicity, and serious pollution. Once it enters the environment, it cannot be biodegraded. Most of it participates in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/04B01J20/30C02F1/28C02F1/62
CPCB01J20/048B01J20/3085B01J2220/4806C02F1/281C02F1/62C02F2101/20
Inventor 宁平杨月红石磊程杨张怀予于珊珊
Owner KUNMING UNIV OF SCI & TECH
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