Method for preparing heavy metal adsorbent from blast furnace slag and application

A blast furnace slag and adsorbent technology, which is applied in the field of heavy metal sewage treatment, can solve the problems that metal ions cannot be recovered and reused, the adsorption rate of heavy metal ions is low, and the application effect is poor, and achieves low cost, cheap raw materials, and good adsorption. rate effect

Active Publication Date: 2021-08-10
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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  • Method for preparing heavy metal adsorbent from blast furnace slag and application
  • Method for preparing heavy metal adsorbent from blast furnace slag and application
  • Method for preparing heavy metal adsorbent from blast furnace slag and application

Examples

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preparation example 1

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

[0030] S2: Mix the grinding product obtained in step S1 with a sodium hydroxide solution with a concentration of 10mol / L at a weight ratio of 1:6, heat up to 60°C, then keep stirring at a constant temperature for 1.5h, and finally cool and filter with suction, and keep the filtrate Record it as solution 1, wash the filter residue with water 4 times to constant weight, dry it for later use and record it as solid 1; this step is to separate aluminum and silicon from blast furnace slag with lye.

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

preparation example 2

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

preparation example 3

[0039] The rest is the same as that of Preparation Example 1, except that in Step S4, Suspension 2 is prepared by Suspension 1 and Solution 3 at a weight ratio of 1:3.

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Abstract

The invention discloses a method for preparing a heavy metal adsorbent from blast furnace slag and application, and the method comprises the following steps: soaking blast furnace slag in water, filtering, drying and grinding; reacting the ground product with alkali liquor, carrying out suction filtration, retaining the filtrate as solution 1, and recording the filter residue as solid 1; adjusting the pH value of the solution 1, performing suction filtration, and recording filtrate as solution 2; adding filter residues into alkali liquor 2, and reacting to obtain a clear solution 3; and performing ultrasonic dispersion on the solid 1 in water to obtain a suspension 1, adding the solution 3 into the suspension 1, performing ultrasonic dispersion to obtain a suspension 2, adding the solution 2, and finally performing centrifugal separation to obtain the adsorbent. According to the invention, aluminum ions and silicate ions are separated from blast furnace slag, then the aluminum ions and the silicate ions are mixed with a treated blast furnace slag skeleton, and the use amounts and curing conditions of the aluminum ions, the silicate ions and the treated blast furnace slag skeleton are controlled, so that the adsorbent which has a fluffy and granular skeleton and covers a layer of bulges and wrinkles on the surface of the skeleton is prepared, the specific surface area is large, and the adsorption rate on heavy metals is good.

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 utilizing blast furnace slag. Background technique [0002] my country is a big country of iron and steel, and its steel production ranks first in the world. 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 ton of iron produced, and the utilization rate Only at 70% to 85%, compared with developed countries, the recovery rate of blast furnace slag in my country is still at a low level. 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, electronics ...

Claims

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Application Information

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Patent Type & Authority Applications(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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