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Modified spherical sponge iron for wastewater treatment and preparation method

A technology of sewage treatment and sponge iron, applied in the direction of adsorption water/sewage treatment, chemical instruments and methods, through adsorption, etc., can solve the impact of sponge iron specific surface area and activity, weaken the operability, storage and application difficulties of spherical sponge iron and other problems, to achieve the effect of being suitable for storage and use, not easy to harden, and low production cost

Inactive Publication Date: 2008-09-24
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent application "A Spherical Sponge Iron for Water Treatment and Its Preparation Method" (Application No.: 200710139300.8) is researched and developed on the basis of carbon-based direct reduction to produce sponge iron, and its product spherical sponge iron crystal grains can reach below 10μm , has the characteristics of high specific surface energy and strong reducibility, but the problems are as follows: 1. The reducing agent in the preparation process of spherical sponge iron is charcoal, according to the charcoal gasification reaction (C+CO 2 =2CO), the temperature of the reduction reaction is relatively high and needs to be controlled above 900°C, which requires high reduction equipment, high energy consumption, and high product preparation costs; 2. Due to the high reduction temperature, the iron crystal There is a process of continuous growth of sponge iron grains, so the iron grains are relatively large, and the specific surface area and activity of sponge iron are affected to a certain extent.
3. The sponge iron is prone to secondary oxidation in the air. In order to prevent secondary oxidation, the sponge iron needs to be specially preserved, which brings great difficulties to storage and application, and greatly weakens the practical application of spherical sponge iron. Operability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take iron fine powder, finely grind it to 150 mesh, add 0.5% diatomite to the weight of iron fine powder, mix evenly, add disc pelletizer, and make balls during the process of adding water, the diameter of the ball is 1-10mm; the ball is natural After drying, place it in a high-temperature roasting furnace, and oxidize and roast it at 1400 ° C for 30 minutes to obtain oxidized pellets; place the oxidized pellets in a reduction furnace, and pass 2 NL / min of H 2 , after 1h reduction, spherical sponge iron was obtained; stop passing H 2 , switch to 2NL / min CO gas carburizing for 30min, after cooling, it can be made into modified spherical sponge iron.

Embodiment 2

[0022] Take the iron oxide sheet, finely grind it to 180 mesh, add 1% bentonite to the weight of the iron oxide sheet, mix it evenly and add it to a disc pelletizer, and make pellets during the process of adding water, with a diameter of 1-10mm; the balls are naturally dried and placed in In a high-temperature roasting furnace, oxidize and roast at 1300°C for 60 minutes to obtain oxidized pellets; place the oxidized pellets in a reduction furnace, and feed 1NL / min of H at 700°C 2 , after 2h reduction, spherical sponge iron was obtained; stop passing H 2 , switch to 1NL / min CH 4 Gas carburizing for 60min, after cooling, it can be made into modified spherical sponge iron.

Embodiment 3

[0024] Take fine iron powder, finely grind it to 200 mesh, add 0.3% of diatomite and 0.4% bentonite binder accounting for the weight of the iron fine powder, mix well and add to the disc pelletizer, during the process of adding water, pellets are formed, and the diameter of the ball is The size is 1-10mm; the balls are naturally dried and placed in a high-temperature roasting furnace, and oxidized and roasted at 1200 ° C for 90 minutes to obtain oxidized pellets; the oxidized pellets are placed in a reduction furnace, and 3 NL / min h 2 , after 3 hours of reduction, a highly active spherical sponge iron was obtained; stop passing H 2 , switch to 3NL / minCO, CH 4 Gas carburizing for 90 minutes, after cooling, it can be made into modified spherical sponge iron.

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Abstract

The invention relates to a modified sphere-shaped sponge iron used for sewage treatment and a preparation method thereof, and belongs to the technical field of metallurgical production. The modified sphere-shaped sponge iron is used for reducing crystal grains in the sphere-shaped sponge iron and improving the specific surface area and the stability of the sphere-shaped sponge iron in air. The modified sphere-shaped sponge iron is characterized in that the modification sphere-shaped sponge iron has a porous structure, the diameter of a sphere ranges from 1 to 10mm, while the diameter of an internal elementary iron crystal grain is less than 1 micron, and the specific surface area is 0-50m<2> / g; the surface layer of the sponge iron is cementite with the thickness between 10 nanometers and 100 nanometers. The process of the invention includes material blending, sphere making, oxidizing roasting, direct deoxygenizing and carburizing of the sphere-shaped sponge iron, etc. In the invention, H2 is chosen as a reductant, thereby ensuring low temperature in the preparation of the sponge iron and ensuring the reductive sponge iron finer; the process of the carburizing of the sphere-shaped sponge iron is increased so as to ensure the surface layer of the sponge iron to be attached by a carburizing layer with the thickness between 10 nanometers and 100 nanometers and the sponge iron is not easy to undergo secondary oxidization. Compared with the prior art, the modification sphere-shaped sponge iron has the advantages of low production cost, high efficiency of stain removing, uneasy hardening and convenient storage and usage, etc.

Description

technical field [0001] The invention relates to a modified spherical iron sponge for water treatment and a production process, belonging to the technical field of metallurgical production. Background technique [0002] With the advancement of science and technology, the discharge of industrial pollutants is increasing day by day, and a large amount of heavy metals and organic pollutants enter the environment, which brings great pressure to environmental protection. At present, sewage treatment mainly adopts physical and chemical methods, phytoremediation and biological methods. Among them, the traditional physical and chemical methods have problems such as large amount of water treatment agents used and uncontrollable reactions; Strong; bioremediation technology needs to control the suitable living environment of microorganisms, which is greatly restricted in the process of large-scale application, and cannot treat highly toxic wastewater. [0003] After the 1990s, domestic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/02B01J20/30C02F1/28C21B13/00
CPCY02C10/08Y02C20/40Y02P10/143
Inventor 李俊国田薇闫小林
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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