Prepn of nano-cobaltosic oxide powder

A nano-powder and cobalt salt technology, applied in the direction of cobalt oxide/cobalt hydroxide, cobalt carbonate, etc., can solve the problems of chemical composition, purity, particle size, crystal form, etc., and achieve easy control of parameters and simple process operation Effect

Inactive Publication Date: 2002-04-17
SHANDONG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cobalt oxides produced by the rough production process in the past cannot meet the requirements of t

Method used

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  • Prepn of nano-cobaltosic oxide powder
  • Prepn of nano-cobaltosic oxide powder
  • Prepn of nano-cobaltosic oxide powder

Examples

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Example Embodiment

[0044] Example 1.

[0045] First, dissolve the cobalt flakes in nitric acid with a volume ratio of 1:1 under heating, and continuously add high-purity water to adjust the density and pH of the solution during the dissolution process, and finally obtain a density of 1.35g / cm 3 , PH 4.5 cobalt nitrate solution, let stand for one day, filter to remove the solid precipitate; then adjust the pH of the solution to 1.5 with nitric acid, carefully evaporate the solvent to obtain a cobalt nitrate solution with a density of 1.57, stand still, cool, and precipitate Cobalt nitrate crystals. Analysis shows that the Fe element content in the cobalt nitrate crystal is less than 0.004%, and the Ni element content is less than 0.025%.

[0046] Chemical precipitation agent adopts food grade NH 4 HCO 3 , The content of Na is less than 0.02%. 25 parts (parts by weight, the same below) of ammonium bicarbonate and 100 kg of high-purity water are used to prepare a 20% weight percent ammonium bicarbonate...

Example Embodiment

[0049] Example 2. As described in Example 1, the difference is:

[0050] 25 parts of ammonium bicarbonate and 150 kilograms of high-purity water are used to prepare an ammonium bicarbonate suspension with a concentration of 14.3% by weight for later use. Under stirring conditions, slowly add the purified density to the ammonium bicarbonate suspension to 1.60g / cm 3 The ratio of cobalt nitrate solution to the weight of the substance: CO 3 2- / Co 2+ =2.6, and adjust the pH of the clear liquid after the reaction =6.7. After the addition is complete, continue stirring for 2.5 hours. Let stand and centrifuge. The cobalt content of the solid is controlled at 21%, and the clear liquid obtained by separation is recycled. Place the wet cobalt carbonate material obtained in the previous step in a suitable container, raise the temperature to 400° C. and keep it for 3.5 hours to obtain a black powder.

[0051] This process uses cobalt flakes and ammonium bicarbonate as initial raw materials, ...

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Abstract

The present invention relates to chemical industry technology. The preparation of nanometer cobaltosic oxide powder includes purifying material, cobalt salt deposition, solid-liquid separation and solid calcination. Cobalt sheet is dissolved in nitric acid while being heated and high purity water is added to regulate solution density and pH value so as to obtain cobalt nitrate solution of 1.5-1.65 g/cu cm density and pH 4-5; ammonium bicarbonate suspension in 14-30 wt% is prepared with ammonium bicarbonate and water; cobalt nitrate solution is added into the suspension slowly to result in weight ratio of carbonate radical to cobalt ion being 2.4-2.6; and the wet cobalt carbonate material is heated to 300-450 deg.c for 3-6 hr to obtain black Co3O4 powder.

Description

(1) Technical field [0001] The present invention relates to a kind of nano material Co 3 o 4 A powder preparation method belongs to the technical field of chemical industry. (2) Background technology [0002] As a multifunctional material, metal oxide solid powders have many uses. At present, it is widely used as gas sensing material, humidity sensing material, temperature sensing material, infrared reflective material; as a catalyst in the petrochemical industry; as an additive in the paint, pigment, and ceramic industries. The following two fields cannot be ignored in the study of the synthesis of metal oxides: one is to prepare solid materials with uniform composition, size, shape, and porosity of various shapes, and to develop different functions of materials with different shapes or to make the existing functions of materials The second is to study the preparation method of simple and feasible metal oxide nanomaterials. [0003] Different types of oxides have differ...

Claims

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Application Information

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IPC IPC(8): C01G51/04C01G51/06
Inventor 孙思修张卫民杨延钊王善政曹相民徐德华
Owner SHANDONG UNIV
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