Production method for low-iron low-silicon fire-resistant material grade chromium oxide green

A refractory material, chromium oxide green technology, applied in the field of chromium salts, can solve problems such as mixing silicon and iron, affecting product performance, etc., to achieve the effect of increasing product varieties, increasing product added value, and good demonstration effect

Active Publication Date: 2014-11-19
GANSU JINSHI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high temperature in the roasting process of the traditional chromic anhydride thermal decomposition process, the kiln head and refractory bricks are made of ordinary carbon steel and ordinary refractory brick

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] Example 1

[0019] Rotary kiln is not modified, 1000Kg of first grade chromic acid anhydride is evenly put into the rotary kiln within 2 hours, the kiln head is sprayed with liquefied petroleum gas to burn, the kiln head flame temperature is controlled to 1000 ℃, and the material is roasted in the rotary kiln for about 3 hours . A total of 0.75 tons of chromium oxide green was produced. The silicon content of the product is 0.28%, the iron content is 0.31%, and the Cr2O3 content is 99.18%. The product does not meet the requirements of refractory grade chromium oxide green products because the content of ferrosilicon exceeds the standard (less than 0.15%).

Example Embodiment

[0020] Example 2

[0021] Renovate the rotary kiln, replace the ordinary steel sealing cover that is easy to oxidize and rust the kiln head to a stainless steel sealing cover to prevent iron rust impurities from being mixed into the product to increase the iron content; replace the kiln head refractory brick material with zirconia high temperature resistant high-grade refractory material. The tail is not modified; 3. For the production processes of mixing, screening, grinding, and packaging involved in the production process, stainless steel is used. After the transformation, 1000Kg of high-grade chromic acid anhydride is uniformly put into the rotary kiln within 2 hours, the kiln head is sprayed with liquefied petroleum gas to burn, the flame temperature of the kiln head is controlled to 1000 ℃, and the material is roasted in the rotary kiln for about 3 hours. The total production also obtained 0.75 tons of chromium oxide green, the silicon content of the product was 0.14%, the ...

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PUM

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Abstract

The invention discloses a production method for low-iron low-silicon fire-resistant material grade chromium oxide green. The production method comprises the following steps: (1), selecting premium-grade chromic anhydride, wherein the silicon content and the iron content are less than 0.02%; (2), adding the chromic anhydride in a rotary kiln, wherein the kiln head sealing cover of the rotary kiln adopts a stainless steel sealing cover, the kiln head refractory bricks are made of zirconia refractory, and the kiln tail is made of normal refractory material; (3), heating the rotary kiln, controlling the temperature of the kiln head to 1000-1200 DEG C, controlling the temperature of the kiln tail to 400-600 DEG C, and enabling the material to stay for 2-4 h in the rotary kiln; (4), after roasting, performing natural cooling to the room temperature, mixing material, screening, grinding and packaging, so as to obtain the low-iron low-silicon fire-resistant material grade chromium oxide green. According to the invention, through improvement and process optimizing control, the content of the silicon and iron meets the requirements of the fire-resistant material grade chromium oxide green, the product meeting the requirements of customers are produced, the product market is expanded, and the additional value of the low-iron low-silicon fire-resistant material grade chromium oxide green is increased.

Description

technical field [0001] The invention relates to the technical field of chromium salts, in particular to a production method of low-iron and low-silicon refractory grade chromium oxide green. Background technique [0002] Chromium oxide green is light green to dark green fine hexagonal crystals. It turns brown when hot, and turns green when cold. The crystal is extremely hard and stable, even if it is fed with hydrogen under red heat, it will not change. The melting point is about 2435°C and the boiling point is 4000°C. The Mohs hardness is 8.5, second only to diamond and corundum. It is mainly used as a pigment to produce refractory materials such as high chrome bricks and chrome corundum bricks, and to smelt metal chromium and chromium carbide. It is also used as a coloring agent for enamel, ceramics, artificial leather, building materials, a catalyst for organic chemical synthesis, light-resistant coatings, abrasive materials, green polishing paste and special ink for p...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 韩登仑张忠元谢希智陈荣
Owner GANSU JINSHI CHEM
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