Grain size adjustable spherical chromium oxide superfine powder preparing method

A technology of ultrafine powder and chromium trioxide, which is applied in the direction of oxide/hydroxide preparation, chromium trioxide, chromium oxide/hydrate, etc., can solve the problems of large technical difficulty of chromium oxide powder, and achieve a wide range of The effect of applying the foreground

Inactive Publication Date: 2003-11-12
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to Cr 2 o 3 or Cr(OH) 3 Due to the inherent crystallization habit, it is very difficult to prepare spherical and ultrafine chromium oxide powder by traditional synthesis process, and there are few related technical patents or literature reports at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take Na 2 Cr 2 o 7 50 grams, 50 grams of water and 60 grams of concentrated sulfuric acid are carefully added to the reactor. After stirring and dissolving, add 15 grams of methyl alcohol and stir to make it return to a blue-green solution; then add 0.85 grams of surfactant to the solution and continue Stir for 20-40 minutes, and adjust the pH value of the solution to 3.3-4.0 with ammonia water.

[0017] Add dropwise an aqueous solution containing precipitant A to the above solution, which is composed of 100 grams of ammonium carbonate and 300 grams of water; the rate of addition is controlled at 30 to 50 ml / min, and sufficient stirring is ensured; then the obtained solid-liquid slurry is separated , and then calcined at about 800-900°C and a weak reducing atmosphere for 1.5-2 hours; the calcined powder is washed, dried and air-flow / pulverized to obtain the required bright green spherical chromium oxide ultra-fine powder product, the particle size It is around 40-50...

Embodiment 2

[0019] Take Na 2 Cr 2 o 7 30 grams, 40 grams of water and 37 grams of concentrated sulfuric acid were carefully added to the reactor. After stirring and dissolving, 10 to 20 grams of methanol was added and stirred to reduce it to a blue-green solution; then, 500 milliliters of water and 0.85 gram of surfactant, continue stirring for 20-40 minutes, and adjust the pH value of the solution to 3.3-4.0 with ammonia water. Under continuous stirring, 500 milliliters of 10% ammonium carbonate solution was first added dropwise to the above solution, the rate of addition was controlled at about 20 ml / min, then 25 milliliters of aqueous solution containing NaOH 20% was added, and stirring was continued for 1 hour; Separation, and then calcining at about 800-900°C and a weak reducing atmosphere for 1.5-2 hours; the calcined powder is washed, dried and air-flow / pulverized to obtain the required bright green spherical chromium oxide ultra-fine powder product. Its particle size is around...

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Abstract

The preparation method of spherical Cr2O3 high-purity ultrafine powder body by using liquid phase method which can control grain size. It uses Na2Cr2O7 as raw material and adopts the processes of acidity reduction, surfactant treatment, pH value regulation, using composite precipitant to control precipitation, solid-liquor separation and roacting to obtain the fresh green spherical Cr2O3 ultrafine powder body with different grain size ranges, and its grain size can be controlled in the range of submicrometer and nanometer range according to the requirements. Said invention also provides a simple method for controlling its granule form and granule size, and said product has extensive application in functional coating material, special product special-purpose additive or special field special-purpose material field.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of functional inorganic materials, and in particular relates to a preparation method of spherical chromium trioxide high-purity ultrafine powder liquid phase method capable of controlling particle size. Background technique [0002] Chromium oxide is an important inorganic green pigment, grinding material and catalyst, etc. It is widely used in various ceramics, functional coatings, banknote printing, organic synthesis, etc. As a pigment, compared with organic pigments, it has excellent thermal stability and chemical stability, and is an excellent raw material / pigment for fine ceramics and green polishing paste; its high hardness and chemical activity make it suitable for grinding materials and organic catalytic synthesis. occupies an important position. About Cr 2 o 3 There are many preparation methods, including high-temperature solid phase, reduction method, thermal decomposition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B13/14C01G37/033
Inventor 宁桂玲林源李云恒
Owner DALIAN UNIV OF TECH
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