A kind of submicron iron-aluminum spinel and its preparation method and application

A Fe-Al spinel, sub-micron technology, applied in the field of refractory materials, can solve the problem of high energy consumption

Inactive Publication Date: 2016-09-14
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The sintering temperature used in the original sintering method to prepare iron-aluminum spinel is relatively high, so it consumes more energy; for example, the sintering used in the patent document with application number 201010104503. The temperature is 1300-1700°C, and the sintering temperature used in the patent document with application number 201210013925.0 is 1200-1500°C

Method used

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  • A kind of submicron iron-aluminum spinel and its preparation method and application
  • A kind of submicron iron-aluminum spinel and its preparation method and application
  • A kind of submicron iron-aluminum spinel and its preparation method and application

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Embodiment 1

[0015] Prepare 8wt% ferrous sulfate solution and 45wt% aluminum sulfate solution respectively, these two kinds of solutions add reactor successively, add the ammonium sulfide solution that concentration is 5wt% in mixed solution; The mol ratio of three kinds of reactants is: Fe : Al: S = 1:2.03: 4.15. Filtrate, put the filter cake in a vacuum furnace, evacuate to a vacuum degree of 0.08MPa, raise the temperature to 150°C in 1 hour, then rise to 900°C in 1.5 hours and keep the temperature at a constant temperature for 3 hours, and naturally cool down to 160°C while maintaining the vacuum condition , took out the roasted sample, and measured its X-ray diffraction spectrum as shown in figure 1 ;From figure 1 It can be seen that the prepared sample belongs to spinel with higher purity; the scanning electron microscope image of the sample is shown in figure 2 ,From figure 2 It can be seen that the particle diameters are basically in the submicron range of 0.1-0.9 microns; the ...

Embodiment 2

[0017] Prepare 23wt% ferrous sulfate solution and 28wt% aluminum sulfate solution respectively, these two kinds of solutions add reactor successively, add the ammonium sulfide solution that concentration is 12wt% in mixed solution; The mol ratio of three kinds of reactants is: Fe : Al: S =1: 2.20: 4.50. Filtrate, put the filter cake in a vacuum furnace, evacuate to a vacuum degree of 0.09MPa, heat up to 150°C in 2 hours, then rise to 1000°C in 2.5 hours and keep the temperature for 2 hours, and cool down naturally to 160°C while maintaining the vacuum condition , took out the roasted sample, and measured its X-ray diffraction spectrum as shown in figure 1 ;From figure 1 It can be seen that the prepared sample belongs to spinel with high purity; from the scanning electron microscope image of the sample (figure omitted), it can be seen that the particle diameter is basically in the submicron range of 0.1-0.9 microns; the filtrate is evaporated and concentrated, cooled and cryst...

Embodiment 3

[0019] Prepare 38wt% ferrous sulfate solution and 10wt% aluminum sulfate solution respectively, these two kinds of solutions add reactor successively, add the ammonium sulfide solution that concentration is 20wt% in mixed solution; The mol ratio of three kinds of reactants is: Fe : Al: S =1: 2.16: 4.34. Filtrate, put the filter cake in a vacuum furnace, evacuate to a vacuum degree of 0.09MPa, raise the temperature to 150°C in 1.5 hours, then rise to 900°C in 4 hours and keep the temperature at a constant temperature for 3 hours, and naturally cool down to 160°C while maintaining the vacuum condition Left and right, take out the roasted sample, measure its X-ray diffraction spectrum and see figure 1 ;From figure 1 It can be seen that the prepared sample belongs to iron-aluminum spinel with high purity; from the scanning electron microscope image of the sample (figure omitted), it can be seen that the particle diameter is basically in the submicron range of 0.1-0.9 microns; the...

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Abstract

The invention relates to sub-micron hercynite. The sub-micron hercynite is characterized in that the grain diameter is below 1.0micron, the hercynite is added into materials for synthesizing a hercynite flame-retardant raw material by a sintering process to serve as seed crystal, and the sintering temperature can be reduced. The invention further provides a method for preparing the sub-micron hercynite. The method comprises the following steps: respectively preparing a ferrous sulfate solution and an aluminum sulfate solution; sequentially adding the ferrous sulfate solution and the aluminum sulfate solution into a reactor, mixing, adding an ammonium sulfide solution into the mixed solution, and filtering after mixed precipitation is generated; carrying out vacuum drying and roasting on a filter cake to obtain the sub-micron hercynite; and distillating, concentrating and crystallizing the filtrate to obtain ammonium sulfate.

Description

technical field [0001] The invention relates to a synthetic submicron iron-aluminum spinel, its preparation method and application, and belongs to the technical field of refractory materials. Background technique [0002] Ferrous aluminum spinel belongs to normal spinel, in which the iron element exists in the form of ferrous ions (the valence is positive divalent) in the tetrahedral gaps formed by the accumulation of oxygen ions, chemically named as ferrous aluminum spinel , but it is customarily referred to as iron-aluminum spinel in the field of refractory materials. [0003] Adding iron-aluminum spinel to magnesia-based refractories can significantly improve the kiln skin hanging performance of magnesia materials in cement rotary kilns. Therefore, magnesia bricks added with iron-aluminum spinel (referred to as magnesia-iron-aluminum spinel bricks) have become a chromium-free material to replace magnesia-chrome bricks. [0004] Iron-aluminum spinel is rare in nature and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/44C04B35/626
CPCC01C1/20C04B35/44C04B35/626C04B35/66C04B2235/785
Inventor 刘俊成丁锐白佳海李成峰杜庆洋封立杰
Owner SHANDONG UNIV OF TECH
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