Microporous magnesium-chromium spinel raw material and preparation method thereof

A technology of microporous magnesia-chromium spinel and spinel, which is applied in the field of microporous magnesia-chromium spinel raw materials and its preparation, can solve the problems of poor sintering performance of magnesia-chromium spinel, high reaction temperature of electric melting method, and technical problems. Complicated problems, to achieve the effect of improving spinel conversion rate, high spinel conversion rate, and reducing thermal conductivity

Active Publication Date: 2017-12-15
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using the molten salt method to wash and remove the remaining molten salt requires a large amount of water and energy, and the cost is high, which hinders the large-scale industrial production of the molten salt method.
[0005] The preparation of magnesia-chromium spinel by electric melting method is mainly to add chromium-containing salt and magnesium-containing salt into a high-temperature electric furnace, and cool after melting. High temperature, complicated process and high energy consumption greatly increase the preparation cost of magnesia-chromium spinel
[0006]

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A microporous magnesia-chromium spinel raw material and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:

[0030] In the first step, according to the mass ratio of magnesium oxalate: chromium carbide (1.1~1.12) : 1, the magnesium oxalate and the chromium carbide are placed in a ball mill, and ball milled to a particle size of ≤ 100 μm to obtain a ball mill powder.

[0031] In the second step, the ball-milling powder is placed in an oven and kept at 200-220° C. for 30-40 minutes to obtain heat-treated powder.

[0032] Step 3: Add water accounting for 15-17wt% of the heat-treated powder to the heat-treated powder, and wet-grind in a ball mill until the particle size is ≤60 μm to obtain a wet abrasive.

[0033] The fourth step is to add the wet abrasive into the mud refining machine, vacuum squeeze the mud, and trap the material for 24 to 36 hours; then put it in the muffle furnace, and keep it warm for 3 to 3.4 ...

Embodiment 2

[0036] A microporous magnesia-chromium spinel raw material and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:

[0037] In the first step, according to the mass ratio of magnesium oxalate: chromium carbide (1.11~1.13) ︰ 1, the magnesium oxalate and the chromium carbide are placed in a ball mill, and ball milled to a particle size of ≤ 100 μm to obtain a ball mill powder.

[0038] In the second step, the ball-milling powder is placed in an oven and kept at 210-230° C. for 30-40 minutes to obtain heat-treated powder.

[0039] Step 3: adding water accounting for 16-18 wt% of the heat-treated powder to the heat-treated powder, and wet-milling in a ball mill until the particle size is ≤60 μm to obtain a wet abrasive.

[0040] The fourth step is to add the wet abrasive into the mud refining machine, vacuum squeeze the mud, and trap the material for 24 to 36 hours; then put it in the muffle furnace, and keep it warm for 3....

Embodiment 3

[0043] A microporous magnesia-chromium spinel raw material and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:

[0044] In the first step, according to the mass ratio of magnesium oxalate: chromium carbide (1.12~1.14) ︰ 1, the magnesium oxalate and the chromium carbide are placed in a ball mill, and ball milled to a particle size of ≤ 100 μm to obtain a ball mill powder.

[0045] In the second step, the ball-milling powder is placed in an oven and kept at 220-240° C. for 30-40 minutes to obtain heat-treated powder.

[0046] Step 3: adding water accounting for 17-19 wt% of the heat-treated powder to the heat-treated powder, and wet-milling in a ball mill until the particle size is ≤60 μm to obtain a wet abrasive.

[0047] The fourth step is to add the wet abrasive into the mud refining machine, vacuum squeeze the mud, and trap the material for 24-36 hours; then put it in the muffle furnace, and keep it warm for 3.4-3...

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Abstract

The invention relates to a microporous magnesium-chromium spinel raw material and a preparation method thereof. According to the technical scheme, the preparation method comprises the following steps: adding magnesium oxalate and chromium carbide into a ball mill in a mass ratio of (1.1-1.15) to 1, and carrying out ball milling until the particle sizes are less than or equal to 100 microns, so as to obtain ball-milled powder; putting the ball-milled powder into a drying oven, and maintaining the temperature at 200-250 DEG C for 30-40 minutes, so as to obtain thermally processed powder; adding water which accounts for 15wt%-20wt% of the thermally processed powder into the thermally processed powder, carrying out wet milling in the ball mill until the particle size is less than or equal to 60 microns, so as to obtain a wet-milled material; and adding the wet-milled material into a mud refining machine, carrying out vacuum mud extrusion molding, and standing for 24-36 hours; putting the processed material into a muffle furnace, maintaining the temperature at 1550-1600 DEG C in an air atmosphere for 3-4 hours, carrying out furnace cooling, and crushing, so as to obtain the microporous magnesium-chromium spinel raw material. The preparation method is simple and low in production cost; the prepared microporous magnesium-chromium spinel raw material is good in sintering performance, high in spinel conversion rate and low in heat conductivity coefficient.

Description

technical field [0001] The invention belongs to the technical field of magnesia-chrome spinel. It specifically relates to a microporous magnesia-chromium spinel raw material and a preparation method thereof. Background technique [0002] Magnesium chromium spinel (MgO Cr 2 o 3 ) are MgO and Cr 2 o 3 A type of solid solution formed after high temperature treatment. Magnesium-chromium spinel has both MgO and Cr 2 o 3 It has the advantages of high melting point, high temperature strength, strong chemical corrosion resistance and good thermal shock stability. It is widely used in high temperature furnaces such as refining ladles, copper smelting converters and electric furnaces. [0003] The existing preparation methods of magnesia-chromium spinel mainly include molten salt method, electric melting method and sintering method. [0004] Magnesium-chromium spinel is prepared by molten salt method, mainly using chromium-containing salt and magnesium-containing minerals as r...

Claims

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Application Information

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IPC IPC(8): C04B35/04C04B35/622
CPCC04B35/04C04B35/622C04B2235/3241C04B2235/5436C04B2235/77C04B2235/9607
Inventor 张寒赵惠忠李正坤张家勤赵鹏达陈建威江文涛余俊
Owner WUHAN UNIV OF SCI & TECH
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