A kind of organic-inorganic composite material for stabilizing treatment of heavy metal waste residue and preparation method thereof

A technology of inorganic composite materials and heavy metal chelating agents, applied in chemical instruments and methods, other chemical processes, transportation and packaging, etc., can solve the problems of easy dissolution of heavy metals, low efficiency of heavy metal treatment, poor stability and strength of solidified bodies, etc. , to achieve the effect of slowing down the pollution of heavy metal ions in groundwater, short consolidation time and compact structure

Active Publication Date: 2022-07-19
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional heavy metal solidification and stabilization technologies mainly include cement concrete and lime solidification and stabilization technologies, but these methods have problems such as low heavy metal treatment efficiency, poor stability and strength of the solidified body, and heavy metals are easy to dissolve and pollute groundwater sources.

Method used

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Examples

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preparation example Construction

[0023] A preparation method of an organic-inorganic composite material for processing heavy metal waste residues, which mainly comprises the following steps:

[0024] S1. Preparation of magnesium phosphate cementitious material: in terms of mass, the raw materials are mixed according to m (magnesium oxide) / m (phosphate)=2~6, m (retarder) / m (phosphate)=0.005~0.5 , after stirring evenly, the magnesium phosphate gelling material can be obtained. Among them, magnesia is calcined from magnesite at a high temperature of 1700 ℃, and the specific surface area of ​​calcined MgO is treated to 300 m 2 Obtained after / kg, phosphate, specifically potassium dihydrogen phosphate, is ground to 100-180 mesh for use, and retarder, specifically borax, is ground to 200-400 mesh for use. The magnesium oxide, potassium dihydrogen phosphate and borax are put into a mixer to be mixed, and the uniformly stirred mixture is put into a dryer for drying (drying temperature is 60-150° C.) to obtain a magn...

Embodiment 1

[0057] S1, preparation of magnesium phosphate cementitious material: in terms of mass ratio, m (magnesium oxide) / m (potassium dihydrogen phosphate)=5, m (borax) / m (potassium dihydrogen phosphate)=0.18 to mix raw materials, stir After uniform, magnesium phosphate gelling material can be obtained;

[0058] S2. Preparation of chitosan modified product:

[0059] S21. The method for preparing chitosan by microwave method is as follows: using chitin as a material, a sodium hydroxide solution with a concentration of 55%, in a mass ratio, after mixing according to chitin:sodium hydroxide=1:15, to obtain The mixed solution was microwaved at a microwave power of 400 W for 20 min to obtain chitosan;

[0060]S22. The method for preparing phosphorylated chitosan is as follows: Weigh 2 g of chitosan prepared in S21 and dissolve it in 100 mL of 2% acetic acid solution. After fully stirring and dissolving, the acetic acid solution is heated to 60°C, and the molar ratio is calculated as , ad...

Embodiment 2

[0065] S1. Preparation of magnesium phosphate cementitious material: in terms of mass, m (magnesium oxide) / m (potassium dihydrogen phosphate)=3, m (borax) / m (potassium dihydrogen phosphate)=0.25 to mix the raw materials, and stir evenly Then, the magnesium phosphate gelling material can be obtained;

[0066] S2. Preparation of chitosan modified product:

[0067] S21. The method for preparing chitosan by microwave method is as follows: using chitin as a material, a sodium hydroxide solution with a concentration of 55%, in a mass ratio, after mixing according to chitin:sodium hydroxide=1:15, to obtain The mixed solution was microwaved at a microwave power of 400 W for 20 min to obtain chitosan;

[0068] S22. The method for preparing phosphorylated chitosan is as follows: Weigh 5g of chitosan prepared in S21 and dissolve it in 50mL, 1% acetic acid solution, after fully stirring and dissolving, add dropwise 10g, 50% phosphoric acid solution to the acetic acid solution, After sti...

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Abstract

The invention relates to the technical field of chemical materials, in particular to an organic-inorganic composite material for stabilizing treatment of heavy metal waste residues and a preparation method thereof. The method mainly includes the following steps: S1 preparing the magnesium phosphate gelling material; S2 preparing chitosan and chitosan modified products; S3 preparing the modified starch heavy metal chelating agent; S4 preparing the magnesium phosphate gelling material prepared in S1, S2 The prepared chitosan or chitosan modified product and the chelating agent prepared by S3 are mixed, and dried to obtain an organic-inorganic composite material, wherein, in terms of mass ratio, m (magnesium phosphate gelling material) / m (chitosan or modified chitosan)=9~90, m (magnesium phosphate gelling material) / m (modified starch heavy metal chelating agent)=9~90. The organic-inorganic composite material prepared by the method of the invention has the advantages of good mechanical strength, low energy consumption for preparation, simple process, large consumption of slag waste, and the like.

Description

technical field [0001] The invention relates to the technical field of chemical materials, in particular to an organic-inorganic composite material for stabilizing treatment of heavy metal waste residues and a preparation method thereof. Background technique [0002] Magnesium Phosphate Cementitious Material (MPC) is a cement material bound by phosphate, which forms chemical bonds through acid-base reaction and has a certain mechanical strength. Compared with ordinary Portland cement, magnesium phosphate cementitious materials have the characteristics of fast setting speed, high strength, dry shrinkage, and frost resistance. They can be used as stabilizers to form stable substances with heavy metal ions, so they can be effectively cured at room temperature. heavy metal ion. At the same time, as chelating agents, natural polymers and their derivatives not only have the advantages of abundant sources, biochemical degradation, simple preparation process, and low cost, but also...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/25C04B28/34B01J20/24B01J20/30C04B111/20
CPCC04B28/344B01J20/24B01J2220/4825C04B2201/50C04B2111/00767C04B2111/20C04B22/16C04B22/0013C04B22/066C04B24/38C04B24/08C04B22/085C04B24/045C04B24/121C04B18/0472
Inventor 冯川玉段平江金萍
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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