Chrome oxide product sintering method

A sintering method and chromium oxide technology are applied in the field of sintering chromium oxide products by controlling the atmosphere, which can solve problems such as failure to realize industrialization, and achieve the effects of easy industrial application, low labor intensity, and easy process control.

Active Publication Date: 2006-07-12
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods of controlling the sintering atmosphere have not

Method used

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  • Chrome oxide product sintering method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Chromium oxide products use pure Cr 2 o 3 The fine powder is put into the electric furnace kiln after being pressed and formed, and 98% N is fed into the kiln through the control of the flow meter. 2 and 2%H 2 Observe the height difference of the water column in the U-shaped tube so that the pressure in the kiln is 20 mm of water column to ensure that the kiln is in a state of slight positive pressure and a reducing atmosphere to prevent outside air from entering the electric furnace kiln, and then keep warm at 1450 ° C for 1 hour sintering. In Comparative Example 1, the same sample was sintered at 1700°C for 1 hour in an air atmosphere. Under the same atmosphere, the higher the firing temperature, the higher the bulk density of the chromium oxide product and the lower the apparent porosity. Their bulk density and apparent porosity are compared in Table 1.

[0013] Bulk density (g / cm 3 )

Embodiment 2

[0015] Chromium oxide products use pure Cr 2 o 3 Composite fine powder, its raw material composition is (by percentage weight): Cr 2 o 3 97%, TiO 2 3%, put it into the electric furnace kiln after being pressed and formed, and pass 95% N into the kiln through the control of the flow meter 2 and 5%H 2 Observe the height difference of the water column in the U-shaped tube so that the pressure in the kiln is 10 mm of water column, and keep the temperature at 1400 °C for 4 hours for sintering. In Comparative Example 2, the same sample was sintered at 1680° C. for 1 hour in an air atmosphere. Their bulk density and apparent porosity are compared in Table 2.

[0016] Bulk density (g / cm 3 )

Embodiment 3

[0018] Chromium oxide products use pure Cr 2 o 3 Composite fine powder, its raw material composition is (by percentage weight): Cr 2 o 3 88%, TiO 2 4%, ZrO 2 8%, put it into the electric furnace kiln after being pressed and formed, and pass 99.5% N into the kiln through the control of the flow meter 2 and 0.5% H 2 Observe the height difference of the water column in the U-shaped tube so that the pressure in the kiln is 30 mm of water column, and keep the temperature at 1500 ° C for 2 hours for sintering. In comparative example 3, the same sample was sintered at 1700° C. for 2 hours in an air atmosphere. Their bulk density and apparent porosity are compared in Table 3.

[0019] Bulk density (g / cm 3 )

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Abstract

The invention provides a method for burning chrome green product which comprises: venting the N2/H2 mixing gas to the electric stove with chrome green product, controlling the rate and the gauge of N2 and H2 by flow gauge to ascertain it is positive pressure condition inside the stove, burning the chrome green product at the tempter of 1400-1550 deg. for 1-8 hours. Wherein in the N2/ H2 mixing gas (by volume rate), N2 95-99.5%, H2 0.5-5%; The positive pressure rage is 10-30 mille water columns.

Description

technical field [0001] The invention relates to a sintering method for chromium oxide products, in particular to a method for sintering chromium oxide products by controlling the atmosphere. Background technique [0002] Due to its excellent corrosion resistance and long service life, chromium oxide products are used for lining of alkali-free glass fiber tank kilns and gasifiers and other industrial kiln linings, hot surface materials, etc. As the material of these key parts, there is no material that can replace it at present. [0003] For the sintering of chromium oxide products, there are mainly buried carbon sintering methods, electric melting methods, and controlled sintering atmosphere methods. The first two methods have problems such as large energy consumption, high work intensity, and easy to cause environmental pollution. The third method mainly refers to controlling the oxygen partial pressure by controlling the atmosphere, so as to obtain densified sintering. ...

Claims

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Application Information

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IPC IPC(8): C04B35/64C04B35/12
Inventor 耿可明徐延庆范志辉王金相
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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