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A kind of method and application of preparing heavy metal adsorbent by using blast furnace slag

A technology of blast furnace slag and adsorbent, which is applied in the field of heavy metal sewage treatment, can solve the problems of metal ions not being recovered and reused, poor application effect, and low adsorption rate of heavy metal ions, and achieve low cost, good adsorption rate, and raw material cheap effect

Active Publication Date: 2022-07-12
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

Although the preparation method of the above-mentioned technical adsorbent is simple and low in cost, its application effect is slightly poor, especially the adsorption rate of heavy metal ions is low, and metal ions cannot be effectively recovered and reused. Therefore, it is necessary to further improve blast furnace slag The preparation method of adsorbent, in order to improve the adsorption rate of heavy metal ions, so that metal ions can be effectively recovered and reused, and blast furnace slag can also maximize resource utilization

Method used

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  • A kind of method and application of preparing heavy metal adsorbent by using blast furnace slag
  • A kind of method and application of preparing heavy metal adsorbent by using blast furnace slag
  • A kind of method and application of preparing heavy metal adsorbent by using blast furnace slag

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Effect test

preparation example 1

[0029] S1: Immerse 100 parts of blast furnace slag in 200 parts of water for 20 minutes, filter, dry, take out and place in a ball mill, grind to a particle size of 120 mesh, for use;

[0030] S2: Mix the ground product obtained in step S1 with a sodium hydroxide solution with a concentration of 10 mol / L at a weight ratio of 1:6, heat up to 60° C., then keep the constant temperature stirring for 1.5 hours, and finally cool and filter with suction to retain the filtrate. Denoted as solution 1, the filter residue was washed with water 4 times to a constant weight, dried for use and denoted as solid 1; this step is to separate aluminum and silicon from blast furnace slag with alkaline solution.

[0031] S3: adding the hydrochloric acid solution with a concentration of 4mol / L in solution 1 to adjust pH to 8, then suction filtration, and retaining the filtrate as solution 2 for subsequent use; washing the filter residue with water 3 times, then adding to the sodium hydroxide solutio...

preparation example 2

[0037] The rest are the same as in Preparation Example 1, except that in Step S4, the suspension 1 is prepared from the solid 1 and the water in a weight ratio of 1:4.

preparation example 3

[0039] The rest are the same as in Preparation Example 1, except that in step S4, suspension 2 is prepared by suspension 1 and solution 3 in a weight ratio of 1:3.

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Abstract

A method and application for preparing a heavy metal adsorbent using blast furnace slag, the method comprises: soaking blast furnace slag in water, filtering, drying, and grinding; Record solid 1; adjust the pH of solution 1, suction filtration, and record the filtrate as solution 2; add the filter residue to lye 2, and react to obtain clear solution 3; ultrasonically disperse solid 1 in water to obtain suspension 1, and add solution to suspension 1 3, ultrasonically disperse to obtain suspension 2, then add solution 2, and finally centrifuge to obtain adsorbent. In the present invention, aluminum ions and silicate ions are separated from blast furnace slag, then the two are mixed with the treated blast furnace slag skeleton, and the dosage and curing conditions of the three are controlled to prepare a fluffy, granular skeleton, At the same time, the surface of the skeleton is covered with a layer of convex and "wrinkled" aluminosilicate rough gel adsorbent, which has a large specific surface area and a good adsorption rate for heavy metals.

Description

technical field [0001] The invention belongs to the technical field of heavy metal sewage treatment, and in particular relates to a method and application for preparing a heavy metal adsorbent by using blast furnace slag. Background technique [0002] my country is a big iron and steel country with the world's largest iron and steel output. Blast furnace ironmaking is the most common ironmaking method. According to incomplete statistics, in the process of blast furnace ironmaking, 350kg of blast furnace slag will be discharged for every 1t of iron produced, and the utilization rate of iron will be 350kg. Only at 70% to 85%, the recovery rate of blast furnace slag in my country is still at a low level compared with developed countries. In order to improve the resource reuse rate of blast furnace slag, scholars have conducted in-depth research on it. According to the diversification of chemical composition and chemical properties, it is often used in machinery, construction, el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/10B01J20/04B01J20/08B01J20/30C02F1/28C02F101/20
CPCB01J20/041B01J20/10B01J20/08C02F1/281B01J2220/4887C02F2101/20Y02W30/50
Inventor 刘晓明王亚光张未郝先胜鲁洋薛阳
Owner UNIV OF SCI & TECH BEIJING
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