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Method and device for continuously preparing nano ferroferric oxide through hollow fiber ultrafiltration dual-membrane

A technology of ferric oxide and ultrafiltration membrane, which is applied in the direction of ferric oxide/hydroxide and ferric oxide, which can solve the problems of inability to realize continuous preparation, low particle purity and uneven distribution, and achieve The effect of low price, simple process and flexible operation

Inactive Publication Date: 2010-07-14
中国大唐集团科学技术研究总院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have produced nano-Fe 3 o 4 The particle purity is not high, the particle size is large and unevenly distributed, the cost is high, etc., and continuous preparation cannot be realized

Method used

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  • Method and device for continuously preparing nano ferroferric oxide through hollow fiber ultrafiltration dual-membrane
  • Method and device for continuously preparing nano ferroferric oxide through hollow fiber ultrafiltration dual-membrane
  • Method and device for continuously preparing nano ferroferric oxide through hollow fiber ultrafiltration dual-membrane

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Embodiment 1

[0034] Embodiment 1 (reaction device of the present invention)

[0035]The device needed to realize the double-membrane continuous preparation of nanometer iron tetroxide by hollow fiber ultrafiltration membrane is mainly composed of reactor 5, protective cover 9, nitrogen bottle 8, pump I 3, pump II 4, storage tank I 1, storage Tank II 2, hollow fiber ultrafiltration membrane module A 6, hollow fiber ultrafiltration membrane module B 7; reactor 5 is equipped with a protective cover 9, and reactor 5 is equipped with agitator and pH meter; protective cover 9 is connected with nitrogen cylinder 8 ; The outlet of the pump I 3 inlet is connected with the storage tank I 1 of the precipitant solution, the outlet of the pump I 3 is connected with the inlet of the hollow fiber ultrafiltration membrane module A 6, and the outlet of the hollow fiber ultrafiltration membrane module A 6 is connected with the precipitant and dispersed The inlet of the storage tank I1 of the agent mixed sol...

Embodiment 2

[0037] Realize the method for continuously preparing nanometer iron tetroxide with double-membrane hollow fiber ultrafiltration membrane, the preparation steps are as follows:

[0038] (1) Preparation of raw materials and precipitant:

[0039] Press Fe 3+ : Fe 2+ = 1:1~3:2 ratio, configure all iron (Fe 3+ +Fe 2 ) mixed solution with a concentration of 0.3mol / L to 0.5mol / L; NaOH or ammonia water containing a dispersant at a concentration of 1mol / L, wherein the molar ratio of NaOH or ammonia water to the dispersant is 1:0.002 to 1:0.01.

[0040] (2) Mixing and reaction

[0041] Add distilled water or desalted water, which accounts for 1 / 2-2 / 3 of the reactor volume, into the reactor for deoxygenation protection at room temperature; under the action of the pump I, the storage tank I contains sodium hydroxide or ammonia water as a dispersant The mixed solution enters the hollow fiber ultrafiltration membrane module A and circulates back to the storage tank I, and part of the s...

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Abstract

The invention relates to a method and a device for continuously preparing nano ferroferric oxide through a hollow fiber ultrafiltration dual-membrane. Distilled water or desalted water is added into a reactor and nitrogen is fed in to remove oxygen protection; a pump I is started up to enable NaOH or ammonia water solution in a storage tank I to enter a membrane assembly A, partial solution enters the reactor through the membrane assembly A and partial solution flows back to the storage tank I in a circulating way; when pH value of solution in the reactor is increased to about 10.40, a pump II is started up to enable Fe2+ and Fe3+ mixed solution in a storage tank II to enter a membrane assembly B, partial solution enters the reactor through the membrane B and partial solution flows back to the storage tank II in a circulating way; the flow of raw materials and precipitant is controlled, the pH value of solution in the reactor is kept to be 10.4-11 and Fe3O4 is generated through reaction under agitation. The Fe3O4 is crystallized in water bath, is separated through a magnetic seat, is water-washed to a state with pH value of 7, is shocked through ultrasonic wave and is dried under a vacuum condition to obtain black nano Fe3O4, wherein the grain size of the black nano Fe3O4 is 10-20nm.

Description

technical field [0001] The invention relates to a method for preparing nano-scale ferric oxide, in particular to a method and device for continuously preparing nano-iron ferric oxide with double-membrane hollow fiber ultrafiltration membranes. Background technique [0002] Superparamagnetism is a special magnetic effect. Substances with superparamagnetism are magnetized when an external magnetic field is applied. When the external magnetic field disappears, the magnetization of superparamagnetic substances is almost zero and the coercive force is very small. Due to this special property, superparamagnetic materials are used in many fields, so superparamagnetic materials have attracted much attention. Among them, nano-Fe 3 o 4 It is one of the most widely used superparamagnetic materials. [0003] Iron Tetroxide Fe 3 o 4 , also known as magnetic iron oxide, black powder, specific gravity 5.18, melting point 1538°C, decomposes at the same time, easily oxidizes to ferric o...

Claims

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Application Information

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IPC IPC(8): C01G49/08
Inventor 关晓辉鲁敏王磊张明媛郑博天
Owner 中国大唐集团科学技术研究总院有限公司
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