Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of preparation method of magnetic iron oxide

A technology of iron oxyhydroxide and hydrogen peroxide, applied in chemical instruments and methods, oxidized water/sewage treatment, ammonium sulfate, etc., can solve the problem of physical adsorption capacity and chemical adsorption capacity decline, specific surface area reduction, active site reduction, etc. problems, achieve the effects of shortening the preparation cycle, large specific surface area, and improving the breakthrough sulfur capacity

Active Publication Date: 2019-04-30
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above technology mixes solid soluble ferrous salt with solid hydroxide to obtain a mixture, and kneads the mixture to complete the reaction. During the kneading process, the temperature of the material is controlled not to exceed 70°C, and through the oxidation of oxygen in the air, Finally, the mixture is oxidized into amorphous iron oxyhydroxide, but the whole oxidation process is gentle, time-consuming, the oxidation rate is slow, the grain grows gradually, and finally forms iron oxyhydroxide with crystal form, resulting in the reduction of crystal defects, The reduction of active sites and specific surface area leads to a corresponding decrease in physical adsorption capacity and chemical adsorption capacity, which ultimately leads to fewer crystal defects in the magnetic iron oxide prepared after roasting, a decrease in specific surface area, and fewer active sites combined with sulfur.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation method of magnetic iron oxide
  • A kind of preparation method of magnetic iron oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment provides a method for preparing magnetic iron oxide, comprising the following steps:

[0038] 1) adding sulfuric acid with a concentration of 60wt% to the ferrous sulfate heptahydrate solid, stirring evenly to make it fully acidified, wherein the molar ratio of ferrous sulfate to sulfuric acid is 1:0.25;

[0039] 2) Mix the acidified ferrous sulfate with 50wt% hydrogen peroxide and react at 20°C for 0.5h to prepare an iron oxyhydroxide precursor, wherein the molar ratio of the ferrous sulfate to the hydrogen peroxide is 1: 0.7;

[0040] 3) neutralizing the iron oxyhydroxide precursor and ammonium bicarbonate at a molar ratio of 1:5 at 25° C. for 0.5 h to obtain a reaction product;

[0041] 4) performing solid-liquid separation on the reaction product, collecting the solid phase and the liquid phase respectively, evaporating the liquid phase to dryness to obtain ammonium sulfate, and washing the solid phase with water;

[0042] 5) First prepare the solid ...

Embodiment 2

[0047] This embodiment provides a method for preparing magnetic iron oxide, comprising the following steps:

[0048] 1) adding sulfuric acid with a concentration of 70wt% to the ferrous sulfate heptahydrate solid, stirring evenly to make it fully acidified, wherein the molar ratio of ferrous sulfate to sulfuric acid is 1:0.4;

[0049] 2) Mix the acidified ferrous sulfate with 40wt% hydrogen peroxide and react at 30°C for 1 hour to prepare an iron oxyhydroxide precursor, wherein the molar ratio of the ferrous sulfate to the hydrogen peroxide is 1:0.6 ;

[0050] 3) neutralizing the iron oxyhydroxide precursor and ammonium carbonate at a molar ratio of 1:7 at 50° C. for 1 hour to obtain a reaction product;

[0051] 4) performing solid-liquid separation on the reaction product, collecting the solid phase and the liquid phase respectively, evaporating the liquid phase to dryness to obtain ammonium sulfate, and washing the solid phase with water;

[0052] 5) First prepare the soli...

Embodiment 3

[0057] This embodiment provides a method for preparing magnetic iron oxide, comprising the following steps:

[0058] 1) adding sulfuric acid with a concentration of 80wt% to the ferrous sulfate heptahydrate solid, stirring evenly to make it fully acidified, wherein the molar ratio of ferrous sulfate to sulfuric acid is 1:0.3;

[0059] 2) Mix the acidified ferrous sulfate with 30wt% hydrogen peroxide and react at 25° C. for 1.5 h to prepare an iron oxyhydroxide precursor, wherein the molar ratio of the ferrous sulfate to the hydrogen peroxide is 1: 0.55;

[0060] 3) neutralizing the iron oxyhydroxide precursor and ammonium bicarbonate at a molar ratio of 1:5 at 25° C. for 1.5 h to obtain a reaction product;

[0061] 4) performing solid-liquid separation on the reaction product, collecting the solid phase and the liquid phase respectively, evaporating the liquid phase to dryness to obtain ammonium sulfate, and washing the solid phase with water;

[0062] 5) Prepare the washed ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
specific surface areaaaaaaaaaaa
specific surface areaaaaaaaaaaa
specific surface areaaaaaaaaaaa
Login to View More

Abstract

The invention discloses a magnetic iron oxide preparing method. The magnetic iron oxide preparing method includes: 1) acidizing ferrous sulfate by an acid; 2) mixing the acidized ferrous sulfate with hydrogen peroxide to enable reaction to prepare a hydroxyl-ferric oxide precursor; 3) subjecting the hydroxyl-ferric oxide precursor and ammonium bicarbonate or ammonium carbonate to neutralization reaction so as to obtain a reaction product; 4) subjecting the reaction product to solid-liquid separation and collecting solid phases; 5) drying and roasting the solid phases sequentially to prepare magnetic iron oxide. The magnetic iron oxide has a lot of lattice imperfections, a lot of active binding sites and a large specific surface area, thereby being high in adsorption capacity and widely applicable to the fields of sewage treatment and gas purification.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and desulfurization purification, and in particular relates to a preparation method of magnetic iron oxide. Background technique [0002] In the field of sewage treatment and desulfurization purification technology, reagents are often needed to remove impurities in sewage or sulfur in sulfur-containing substances, so as to achieve the purpose of purifying sewage and sulfur-containing substances. In particular, coal or petroleum contains a lot of sulfur-containing substances, which will release hydrogen sulfide in the process of preparing chemical raw materials, which directly leads to poisoning and deactivation of catalyst active substances in subsequent production sections. In order to avoid the above problems, the prior art usually uses a desulfurizer to remove the hydrogen sulfide released in the above process. [0003] In order to better realize the removal of hydrogen sulfide, the r...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/622C05C3/00C01C1/24C02F1/72C02F1/28
CPCC01C1/24C02F1/281C02F1/72C02F2209/08C04B35/26C04B35/622C05C3/00
Inventor 王立贤
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products