Preparation method of hercynite

A technology of iron-aluminum spinel and iron salt, which is applied in the field of preparation of iron-aluminum spinel, can solve the problems of non-compact structure, high sintering temperature of iron-aluminum spinel, low content of iron-aluminum spinel, etc., and achieve internal Compact structure, shortened reaction time, fully and evenly reacted effect

Inactive Publication Date: 2012-07-25
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the problems of high sintering temperature, low content of iron-aluminum spinel and non-compact structure i

Method used

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  • Preparation method of hercynite

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Example Embodiment

[0028] Example 1

[0029] A method for preparing iron-aluminum spinel, the steps are as follows:

[0030] 1) Mix aluminum nitrate and ferric nitrate at a molar ratio of 2:1 and dissolve them in ethanol to make a mixed solution with a concentration of 1 mol / L for use;

[0031] 2) Add ammonia water dropwise to the mixed solution prepared in step 1 while stirring for neutralization until the pH of the mixed solution is 7, and precipitation is generated during the neutralization process;

[0032] 3) Filter out the precipitate in step 2, wash with distilled water, add ethylene glycol for dispersion, and then dry it for use;

[0033] 4) The dried precipitate in step 3 is calcined at 300°C-800°C for 1-3h, then 5% of the total weight of the precipitate and 1.6% graphite powder are added and mixed thoroughly. , Use cold isostatic pressing to form a compact for use;

[0034] 5) The briquettes prepared in step 4 are sintered under a vacuum condition of 1400°C for 4 hours, and after natural cooling...

Example Embodiment

[0035] Example 2

[0036] A method for preparing iron-aluminum spinel, the steps are as follows:

[0037] 1) Mix aluminum chloride and ferric chloride at a molar ratio of 2:1 and dissolve them in distilled water to make a mixed solution with a concentration of 1 mol / L for use;

[0038] 2) Add sodium hydroxide solution dropwise to the mixed solution prepared in step 1 while stirring for neutralization until the pH of the mixed solution is 7, and precipitation is generated during the neutralization process;

[0039] 3) Filter out the precipitate in step 2, wash with distilled water, add absolute ethanol for dispersion, and then dry it for use;

[0040] 4) The dried precipitate in step 3 is calcined at 300°C-800°C for 1-3h, then 3% of the total weight of the precipitate and 1% graphite powder are added and mixed thoroughly. After that, cold isostatic pressing is used to form compacts for use;

[0041] 5) The briquettes prepared in step 4 are sintered at 1550°C under argon protection for 3 ...

Example Embodiment

[0042] Example 3

[0043] A method for preparing iron-aluminum spinel, the steps are as follows:

[0044] 1) Mix aluminum sulfate and ferrous sulfate according to the molar ratio of aluminum ion to iron ion 2:1 and dissolve them in distilled water to make a mixed solution with a concentration of 1mol / L;

[0045] 2) Add potassium hydroxide solution dropwise to the mixed solution prepared in step 1 while stirring for neutralization until the pH of the mixed solution is 7, and precipitation is generated during the neutralization process;

[0046] 3) Filter out the precipitate in step 2, wash with distilled water, add ethylene glycol for dispersion, and then dry it for use;

[0047] 4) The dried precipitate in step 3 is calcined at 300°C-800°C for 1-3h, and then 1% polyethylene glycol and 2.5% graphite powder of the total weight of the precipitate are added, and after mixing well, Press cold isostatic pressing into a compact for use;

[0048] 5) The briquettes prepared in step 4 are sintere...

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Abstract

The invention provides a preparation method of hercynite, comprising the following steps of: dissolving iron salt and aluminum salt into water or alcohol to prepare a mixed solution in a molar ratio of iron ion to aluminum ion of 1:2; dropwise adding aqueous alkali into the mixed solution to neutralize till the pH value is 7; washing, dispersing and calcining precipitate; adding a binding material and graphite powder to be pressed into a briquette; sintering the briquette at the neutral atmosphere; and cooling to prepare the material. In the method, aluminum hydroxide precipitate and iron hydroxide precipitate, which are evenly mixed with each other, are generated by reaction of aqueous alkali, the aluminum salt and the iron salt react in the solution, and then the precipitate is dispersed by organic alcohol, so that the raw material can be sufficiently dispersed, the reaction is more sufficient and even, and the formed hercynite is more compact in an inner structure; and as the reductive graphite powder is added during sintering, the hercynite can be more preferably generated, so that the reaction time is shortened, and the content is increased.

Description

technical field [0001] The invention belongs to a method for preparing refractory materials, in particular to a method for preparing iron-aluminum spinel. Background technique [0002] my country's cement output in 2010 was 1.88 billion tons, a year-on-year increase of 14.3%. Due to Cr 2 o 3 It can improve the erosion resistance and thermal shock resistance of magnesia refractory materials, and reduce the thermal conductivity, and the performance of hanging kiln skin is better. Therefore, the firing zone of cement rotary kiln in my country still mainly uses 4-12% Cr 2 o 3 magnesia chrome bricks. But under this working condition, trivalent chromium (Cr 3+ ) is easily transformed into hexavalent chromium (Cr 6+ ). Hexavalent chromium is a chemical substance that is harmful to human health. It is soluble in water and can also exist in the gas phase. Therefore, hexavalent chromium can enter the atmosphere through flue gas, and also dissolve into water, polluting water sou...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/44C04B35/622
Inventor 魏世忠周玉成徐流杰张国赏马向东李继文
Owner HENAN UNIV OF SCI & TECH
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