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Impurity removal method for cold-rolled silicon steel iron oxide red

A technology of iron oxide red and cold-rolled silicon steel, which is applied in the direction of iron oxide, iron oxide/iron hydroxide, etc., can solve the problems that cannot be removed and cannot be applied to cold-rolled silicon steel iron oxide red, and achieves simple and easy operation and improved utilization The effect of value and strong practicality

Pending Publication Date: 2014-07-30
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Patent CN201110057511.3 and patent CN201110219466.7 provide two iron oxide red wet washing purification processes, which can only remove water-soluble impurities in iron oxide red, but cannot remove SiO 2 , cannot be applied to cold-rolled silicon steel iron oxide red

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Carry out chemical composition analysis (mass percentage) to the cold-rolled silicon steel iron oxide red that collects on the spot: Fe 2 o 3 95.7%, SiO 2 2.7%, Al 2 o 3 0.45%, Cl - 0.24%. .

[0020] (2) Put the cold-rolled silicon steel red iron oxide into a high-pressure reactor, and add a NaOH solution with 5 times the mass of the iron oxide red and a concentration of 30%.

[0021] (3) The stirring speed is 36 rpm, heated to 140° C., and kept for 2 hours.

[0022] (4) Separating the reacted red iron oxide suspension through a horizontal spiral unloading sedimentation centrifuge to separate the alkali washing liquid and the red iron oxide solid.

[0023] (5) Put the iron oxide red solid after alkaline washing into a stirring tank, add industrial water with 10 times the mass of iron oxide red, and stir for 10-15 minutes.

[0024] (6) Send the stirred iron oxide red suspension into a diaphragm filter press, and press filter for dehydration.

[0025] (7) The...

Embodiment 2

[0030] (1) Carry out chemical composition analysis (mass percentage) to the cold-rolled silicon steel iron oxide red that collects on the spot: Fe 2 o 3 93.5%, SiO 2 5.6%, Al 2 o 3 0.29%, Cl - 0.21%.

[0031] (2) Put the cold-rolled silicon steel red iron oxide into a high-pressure reactor, and add a NaOH solution with 4 times the mass of the iron oxide red and a concentration of 45%.

[0032] (3) The stirring speed is 36 rpm, heated to 180° C., and kept for 4 hours.

[0033] (4) Separating the reacted red iron oxide suspension through a horizontal spiral unloading sedimentation centrifuge to separate the alkali washing liquid and the red iron oxide solid.

[0034] (5) Put the iron oxide red solid after alkaline washing into a stirring tank, add industrial water with 10 times the mass of iron oxide red, and stir for 10-15 minutes.

[0035] (6) Send the stirred iron oxide red suspension into a diaphragm filter press, and press filter for dehydration.

[0036] (7) The de...

Embodiment 3

[0041] (1) Carry out chemical composition analysis (mass percentage) to the cold-rolled silicon steel iron oxide red that collects on the spot: Fe 2 o 3 94.7%, SiO 2 4.1%, Al 2 o 3 0.37%, Cl - 0.21%.

[0042] (2) Put the cold-rolled silicon steel red iron oxide into a high-pressure reactor, and add a NaOH solution with 4 times the mass of the iron oxide red and a concentration of 30%.

[0043] (3) The stirring speed is 36 rpm, heated to 160° C., and kept for 3 hours.

[0044] (4) Separating the reacted red iron oxide suspension through a horizontal spiral unloading sedimentation centrifuge to separate the alkali washing liquid and the red iron oxide solid.

[0045](5) Put the iron oxide red solid after alkaline washing into a stirring tank, add industrial water with 10 times the mass of iron oxide red, and stir for 10-15 minutes.

[0046] (6) Send the stirred iron oxide red suspension into a diaphragm filter press, and press filter for dehydration.

[0047] (7) The deh...

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Abstract

The invention provides an impurity removal method for cold-rolled silicon steel iron oxide red. The impurity removal method for cold-rolled silicon steel iron oxide red comprises the steps of preparing a NaOH water solution with mass percentage of 30-60%, then performing alkaline washing on cold-rolled silicon steel iron oxide red by using the NaOH water solution in the mass which is 3-5 times of that of cold-rolled silicon steel iron oxide red for 2-5h at the temperature of 140-200 DEG C, further separating solids, washing with water, and drying to obtain pure iron oxide red. The method provided by the invention has the advantages of simple process, low cost, capability of effectively removing SiO2 and other impurities in iron oxide red and very strong practicality.

Description

technical field [0001] The invention belongs to the field of impurity removal and reuse of metallurgical solid waste, and specifically refers to a method for removing impurities from cold-rolled silicon steel iron oxide red. Background technique [0002] The cold rolling pickling process often uses the Ruthner process for waste acid regeneration. The by-product iron oxide red produced by the acid regeneration system is an important raw material source for the production of high-performance soft ferrite. For cold-rolled silicon steel plants, especially those producing high-grade oriented silicon steel, SiO in silicon steel iron oxide red 2 ≥2.0%, direct use will have a fatal impact on the performance of soft magnetic materials, so it cannot be directly used in the production of soft ferrite. At present, the silicon steel iron oxide red generally needs to undergo complicated impurity removal treatment before it can be used as a substitute for ore, so the added value is low. ...

Claims

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Application Information

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IPC IPC(8): C01G49/06
Inventor 康凌晨薛改凤黄建阳焦立新沈良田常晓熊家剑张垒方宏辉卢丽君刘瑛李丽坤刘尚超王丽娜付本全刘璞
Owner WUHAN IRON & STEEL (GROUP) CORP
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