Sphere sponge iron used for treating water and preparation method thereof

A sponge iron and water treatment technology, applied in the field of metallurgical production, can solve the problems of low strength and low pollutant removal rate, and achieve the effect of high surface energy, good water permeability and easy realization

Inactive Publication Date: 2008-02-13
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, industrial sponge iron shows defects such as low strength and low removal rate of pollutants in water treatment applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take the iron-containing raw material iron fine powder, finely grind it to 200 mesh, add 0.5% diatomite to the iron-containing material, mix well, use a disc pelletizer to make pellets, the diameter of the pellets is 1-5mm; the balls are dried naturally at high temperature In the roasting furnace, oxidize and roast at 1200°C for 90 minutes to obtain iron oxide pellets; mix iron oxide pellets with charcoal (mass ratio 4:1), place them in a high-temperature reduction furnace, and directly reduce them at 900°C for 90 minutes, then cool After that, it is made into spherical sponge iron.

Embodiment 2

[0019] Take the iron oxide scale as the iron-containing raw material, finely grind it to 200 mesh, add 0.7% diatomaceous earth to the iron-containing material, mix well, and use a disc pelletizer to make pellets with a diameter of 1-5mm; the pellets are naturally dried and then roasted at high temperature In the furnace, oxidize and roast at 1300°C for 50 minutes to obtain iron oxide pellets; mix the iron oxide pellets with charcoal (mass ratio 3.5:1), place them in a high-temperature reduction furnace, and directly reduce them at 1050°C for 50 minutes, and after cooling That is, it is made into spherical sponge iron.

Embodiment 3

[0021] Take the iron-containing raw material iron fine powder and half of the iron-containing material, and grind them finely to 200 mesh. Add 1% diatomaceous earth to the iron-containing material. After mixing evenly, use a disc pelletizer to make pellets. The diameter of the sphere is 1- 5mm; the spheres were naturally dried and oxidized and roasted at 1400°C for 20 minutes in a high-temperature roasting furnace to obtain iron oxide pellets; the iron oxide pellets were mixed with charcoal (mass ratio 3:1), placed in a high-temperature reduction furnace, and heated at 1200°C After 20 minutes of direct reduction, the spherical sponge iron can be made after cooling.

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Abstract

The present invention discloses an orbicular sponge iron and the producing method used for treating water, which belongs to the metallurgy manufacturing technology region. The present invention is used for providing an orbicular sponge iron and the producing method used for treating water with appropriate grain diameter, high deoxidized iron content and much less iron crystal grain. The present invention is characterized in that: the grain diameter of the orbicular sponge iron is 1-5mm; the crystal grain is less than 10um, and the metal ratio is more than 90 percent. The preparation steps in the present invention consists of material-mixing, making sphere, oxidation sintering and direct deoxidization and so on. The present invention is developed according to the requirement for the zero-price iron material of the treated water; the method can develop an orbicular sponge iron, which can wipe off the deleterious and baneful infectant such as heavy metal, nitrate, and chlorine organic substance and so on in the water. Compared with the existing industrial sponge iron or other common zero-price iron material, the product is characterized in that the inner iron crystal grain is micron, the surface area is larger, the surface energy is higher, the deoxidization ability is stronger and the metal ratio is higher. The product is with some intensity, which can avoid the pulverization and hardening in the water treating process. The method and device of the present invention has the advantages of simple technical and low manufacturing cost.

Description

technical field [0001] The invention relates to a spherical sponge iron used for water treatment and a production process, belonging to the technical field of metallurgical production. Background technique [0002] At present, in domestic and foreign research reports, zero-valent iron materials can be used for the treatment of halogenated organic compounds, nitroaromatic compounds, nitrates and heavy metals in polluted water bodies. Zero-valent iron materials mainly include iron filings, iron powder, nano-iron powder, etc. . Among them, iron filings and iron powder are mainly industrial wastes, which are cheap and easy to obtain, but their application is limited due to their small specific surface area and low removal efficiency. [0003] Sponge iron refers to the low-carbon, porous and almost pure iron granular steelmaking pre-product obtained by heating and reducing solid ore or solid pellets at high temperature, also known as direct reduced iron. The best current use of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/70C21B13/00C22B1/14
Inventor 李俊国闫小林
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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