Method for removing arsenic in waste acid by ferroferric oxide/kaolin nano composite material

A technology of nanocomposite materials and ferroferric oxide, applied in the fields of iron oxide/iron hydroxide, chemical instruments and methods, nanotechnology, etc., can solve the problems of toxic elements polluting the environment, large amount of secondary hazardous waste residue, and high water hardness , to avoid secondary pollution, improve adsorption efficiency, and facilitate magnetic separation

Active Publication Date: 2020-08-18
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the widely used sewage acid treatment method is lime neutralization precipitation method. Although this method has simple process and low disposal cost, its harmless disposal is not complete in practical application, and the amount of secondary hazardous waste residue is large.
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Method used

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  • Method for removing arsenic in waste acid by ferroferric oxide/kaolin nano composite material
  • Method for removing arsenic in waste acid by ferroferric oxide/kaolin nano composite material
  • Method for removing arsenic in waste acid by ferroferric oxide/kaolin nano composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: The polluted acid in this example comes from the polluted acid containing a large amount of impurities such as arsenic, which is produced after the sulfuric acid workshop of a zinc smelter in Southwest China washes the smelting flue gas. The main components are shown in Table 1;

[0023] Table 1 Sewage acid composition

[0024]

[0025] A kind of ferroferric oxide / kaolin nanocomposite material removes the method for arsenic in polluted acid, concrete steps are as follows:

[0026] (1) FeCl 3 •6H 2 O and FeSO 4 •7H 2 O was added to the alkaline aqueous solution (NaOH aqueous solution) and mixed evenly, and then hydrothermally reacted for 6 h to obtain Fe-containing 3 o 4 The mixture A; where FeCl 3 •6H 2 O and FeSO 4 •7H 2 The molar ratio of O is 2:1, FeCl 3 •6H 2 O and FeSO 4 •7H 2 The ratio of the total mass of O to the volume of the alkaline aqueous solution mg:mL is 1.2:2; the concentration of the NaOH aqueous solution is 0.06 g / mL; the tem...

Embodiment 2

[0039] Embodiment 2: The polluted acid in this example comes from the polluted acid containing a large amount of impurities such as arsenic produced after the sulfuric acid workshop of a zinc smelter in Southwest China washes the smelting flue gas. The main components are shown in Table 4;

[0040] Table 4 Sewage Acid Components

[0041]

[0042] A kind of ferroferric oxide / kaolin nanocomposite material removes the method for arsenic in polluted acid, concrete steps are as follows:

[0043] (1) FeCl 3 •6H 2 O and FeSO 4 •7H 2 O was added to the alkaline aqueous solution (NaOH aqueous solution) and mixed evenly, and then hydrothermally reacted for 8 h to obtain Fe-containing 3 o 4 The mixture A; where FeCl 3 •6H 2 O and FeSO 4 •7H 2 The molar ratio of O is 3:1, FeCl 3 •6H 2 O and FeSO 4 •7H 2 The ratio of the total mass of O to the volume of the alkaline aqueous solution mg:mL is 0.8:2; the concentration of the NaOH aqueous solution is 0.04 g / mL; the temperature o...

Embodiment 3

[0056] Embodiment 3: The polluted acid in this example comes from the polluted acid containing a large amount of impurities such as arsenic produced after the sulfuric acid workshop of a zinc smelter in Southwest China washes the smelting flue gas. The main components are shown in Table 7;

[0057] Table 7 Sewage Acid Components

[0058]

[0059] A kind of ferroferric oxide / kaolin nanocomposite material removes the method for arsenic in polluted acid, concrete steps are as follows:

[0060] (1) FeCl 3 •6H 2 O and FeSO 4 •7H 2 O was added to the alkaline aqueous solution (NaOH aqueous solution) and mixed evenly, and then hydrothermally reacted for 7 h to obtain Fe-containing 3 o 4 The mixture A; where FeCl 3 •6H 2 O and FeSO 4 •7H 2 The molar ratio of O is 2.5:1, FeCl 3 •6H 2 O and FeSO 4 •7H 2 The ratio of the total mass of O to the volume of the alkaline aqueous solution mg:mL is 1:2; the concentration of the NaOH aqueous solution is 0.05 g / mL; the temperature...

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Abstract

The invention relates to a method for removing arsenic in waste acid by using a ferroferric oxide/kaolin nano composite material, and belongs to the technical field of heavy metal pollution treatment.A mixture (A) containing Fe3O4 is prepared from FeCl3.6H2O and FeSO4.7H2O; the Fe3O4/kaolin nano composite material is prepared from the mixture (A) containing Fe3O4 and a kaolin nano material; and the Fe3O4/kaolin nano composite material reacts with waste acid to remove arsenic in the waste acid. Fe3O4 is loaded on the surface of a kaolin nanotube, so that Fe3O4 is better dispersed, and more arsenic ions can be adsorbed.

Description

technical field [0001] The present invention relates to a kind of Fe 3 o 4 The invention discloses a method for removing arsenic in polluted acid by a kaolin nanocomposite material, which belongs to the technical field of heavy metal pollution control. Background technique [0002] Arsenic, commonly known as arsenic, is a non-metallic element, and its compounds are extremely toxic and harmful to the human body, animals and plants. Arsenic exists in large quantities in water resources and soil through natural and human effects, which poses a great threat to human and plant health. Ferric oxide, chemical formula Fe 3 o 4 . Commonly known as iron oxide black, iron magnet, and black iron oxide, it is a black crystal with magnetic properties, so it is also called magnetic iron oxide. Kaolin is a non-metallic mineral, a kind of clay and clay rock mainly composed of kaolinite clay minerals. Both of them have very good effect on the treatment of arsenic-containing wastewater....

Claims

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Application Information

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IPC IPC(8): C01G49/08C01B33/40B82Y30/00C02F1/28C02F101/10
CPCC01G49/08C01B33/40B82Y30/00C02F1/288C02F1/281C02F2101/103C01P2004/80
Inventor 祁先进李雪竹李国华祝星王华卢治旭段孝旭杨妮娜
Owner KUNMING UNIV OF SCI & TECH
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