A kind of adsorbent capable of removing heavy metals in industrial wastewater and preparation method thereof

A technology for industrial wastewater and adsorbents, applied in chemical instruments and methods, adsorbed water/sewage treatment, water pollutants, etc., can solve the problems of complex preparation process, high price, secondary pollution, etc., and achieve simple preparation process and cost. Low cost and high recovery rate

Active Publication Date: 2021-11-05
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned adsorbents are not only complicated in preparation process and expensive, but also powdery adsorbents are difficult to separate and recycle when dispersed in liquid, and easily cause secondary pollution

Method used

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  • A kind of adsorbent capable of removing heavy metals in industrial wastewater and preparation method thereof
  • A kind of adsorbent capable of removing heavy metals in industrial wastewater and preparation method thereof

Examples

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preparation example Construction

[0026] Please refer to figure 1 The invention provides a preparation method of an adsorbent capable of removing heavy metals in industrial wastewater. The specific steps are shown in the following examples.

[0027] Here, it should be noted that the raw materials and instruments used in the following implementations are all commercially available. Wherein, the sodium hydroxide is industrial grade sodium hydroxide, and the NaOH content in the sodium hydroxide is ≥99.0wt%; the particle size of the steel slag fine powder is less than or equal to 200 mesh; the particle size of the sawdust powder is 500 mesh to 200 mesh , the wood content is greater than or equal to 85wt%; the water glass is industrial grade water glass, and its modulus is 2.0-3.5.

Embodiment 1

[0029] A preparation method of an adsorbent capable of removing heavy metals in industrial wastewater, which mainly comprises the following steps:

[0030] S1, mix and stir 10wt% of sodium hydroxide and 90wt% of water glass until the sodium hydroxide solid particles are completely dissolved to obtain an alkali activator; wherein, the modulus of the water glass is 2.2;

[0031] S2, after mixing 58wt% of sawdust powder, 28wt% of steel slag fine powder and 14wt% of the alkali activator, grind in a grinder for 0.5-1 hour to obtain a uniformly mixed mixed powder;

[0032] S3. Put the mixed powder into a mold, and keep it for 1-3 min under a pressure of 110 MPa to obtain a slag sawdust geopolymer precursor;

[0033] S4. Drying the geopolymer precursor in an oven at 50-65°C for 8-10h, then calcining under nitrogen protection at a temperature of 600-750°C, keeping the temperature for 1-2.5h, and cooling to obtain steel slag Sawdust carbon composite material;

[0034] S5. Repeatedly ...

Embodiment 2

[0036] A preparation method of an adsorbent capable of removing heavy metals in industrial wastewater, which mainly comprises the following steps:

[0037] S1. Mix and stir 15wt% of sodium hydroxide and 85wt% of water glass until the sodium hydroxide solid particles are completely dissolved to obtain an alkali activator; wherein, the modulus of the water glass is 2.8;

[0038] S2, after mixing 60wt% of sawdust powder, 25wt% of steel slag fine powder and 15wt% of the alkali activator, grind in a grinder for 0.5 to 1 hour to obtain a uniformly mixed mixed powder;

[0039] S3. Put the mixed powder into a mold, and keep it for 1-3 min under a pressure of 130 MPa to obtain a slag sawdust geopolymer precursor;

[0040] S4. The geopolymer precursor is dried in an oven at 60-75°C for 9-11 hours, then calcined at a temperature of 700-800°C under nitrogen protection, kept for 1-2.5 hours, and cooled to obtain steel slag Sawdust carbon composite material;

[0041] S5. Repeatedly washin...

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Abstract

The invention belongs to the technical field of industrial wastewater treatment adsorbents, in particular to an adsorbent capable of removing heavy metals in industrial wastewater and a preparation method thereof. The preparation method of the adsorbent comprises mixing and stirring 10-20wt% sodium hydroxide and 80-90wt% water glass until the sodium hydroxide particles are completely dissolved to obtain an alkali activator; mixing 55-65wt% sawdust powder, 20 ~30wt% steel slag powder and 10~20wt% alkali activator are mixed, and ground for 0.5~1h to obtain mixed powder; the mixed powder is machine-pressed under a pressure of 100~150MPa to obtain steel slag sawdust geopolymer precursor; After drying the precursor at 50-80°C, keep it at 600-850°C under nitrogen protection for 1-2.5 hours to obtain the steel slag sawdust-carbon composite material; wash the steel slag sawdust-carbon composite material with deionized water until the pH of the washing water is 5-7 hours, the adsorbent can be obtained. The preparation method of the invention has the advantages of low cost, simple process, and easy industrial production, and the prepared and easily recycled adsorbent for removing heavy metals in industrial wastewater has good adsorption effect on heavy metals and is easy to recycle.

Description

technical field [0001] The invention belongs to the technical field of adsorbents for industrial wastewater treatment, in particular to an adsorbent capable of removing heavy metals in industrial wastewater and a preparation method thereof. Background technique [0002] The development of industrialization process increases the discharge of wastewater containing heavy metal ions, which pollutes water bodies and soil, and directly affects the sanitation of human drinking water. Therefore, the treatment of industrial wastewater containing heavy metal ions has become a focus of attention of scholars around the world. At present, the methods used to treat heavy metal ions in wastewater mainly include chemical precipitation, ion exchange, electrolysis, membrane separation and adsorption. Among them, the adsorption method uses an adsorbent to adsorb one or more heavy metal ions in the water body, and then achieves the purpose of separating and enriching heavy metals through desor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/22
CPCB01J20/041B01J20/06B01J20/10B01J20/20B01J2220/4806B01J2220/4825B01J2220/4887C02F1/281C02F1/283C02F2101/22
Inventor 吴雨波栗海峰罗翔罗文君
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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