Nano chromium sesquioxide and preparation method thereof

A technology of chromium trioxide and chromium hydroxide, which is applied in the directions of chromium trioxide, chromium oxide/hydrate, etc., can solve the problems of wide particle size distribution, complex production process and poor morphology uniformity, etc., and achieve no chromium content. The effect of waste residue discharge, uniform and controllable morphology, and simple preparation method

Pending Publication Date: 2022-07-08
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Claims
  • Application Information

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Problems solved by technology

But the used raw material of aforementioned two kinds of methods is sodium dichromate and chromic anhydride, and the production process technology of these two kinds of raw materials is complex (for example, raw sodium dichromate and chromic anhydride need sulfuric acid acidification, impurity removal, crystallization, Recrystallization and other multi-step process), not only will cause serious loss of chromium, but also cause the discharge of a large amount of chromium-containing was...

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  • Nano chromium sesquioxide and preparation method thereof
  • Nano chromium sesquioxide and preparation method thereof
  • Nano chromium sesquioxide and preparation method thereof

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[0026] An aspect of the embodiment of the present invention provides a preparation method of nano-chromium trioxide, comprising:

[0027] A neutral or alkaline aqueous solution containing a hexavalent chromium compound and a reducing agent is prepared as a reaction solution, and the reaction solution is subjected to a hydrothermal reaction at a temperature of 200 to 280 ° C, and then post-processing is performed to obtain a three-dimensional layered monohydrate Chromium hydroxide nanospheres;

[0028] The three-dimensional layered chromium hydroxide monohydrate nanospheres are calcined at 800-1000° C., and then cooled naturally to obtain nano-chromium trioxide.

[0029] Further, the concentration of the hexavalent chromium compound contained in the reaction solution is below the saturation concentration of the hexavalent chromium compound. Preferably, the concentration of the hexavalent chromium compound contained in the reaction solution is 1-2 mol / L.

[0030] Further, the ...

Embodiment 1

[0052] Example 1 25g sodium chromate, 5g sodium carbonate, 3g sodium hydroxide were added to a certain amount of water to configure a 100ml aqueous solution, then 2g citric acid was added, and the pH value of the solution was about 14 at this time; the configured solution was transferred to 150ml stainless steel high temperature reaction kettle, heated to 280℃, hydrothermal reaction for 12h. Then, the obtained slurry was cooled to room temperature naturally, and after suction filtration, it was fully washed with water until neutral, and vacuum-dried to obtain three-dimensional layered chromium hydroxide monohydrate nanospheres as an intermediate. Figure 1 to Figure 4 As shown, its XRD characterization pattern shows that the intermediate is chromium hydroxide monohydrate (such as Figure 5 shown). Afterwards, the obtained three-dimensional layered chromium hydroxide nanospheres were heated to 800°C at a heating rate of 2°C / min in the air, calcined at a constant temperature fo...

Embodiment 2

[0053] Example 2 25g potassium chromate, 10g potassium carbonate were added to a certain amount of water and configured into a 100ml aqueous solution, then 2g acetic acid was added, and the pH value of the solution was about 12 at this time; the configured solution was transferred to a 150ml stainless steel high temperature reactor, Heated to 260°C for hydrothermal reaction for 15h. Then, the obtained slurry is naturally cooled to room temperature, after suction filtration, fully washed with water until neutral, and freeze-dried to obtain three-dimensional layered chromium hydroxide monohydrate nanospheres. Afterwards, the obtained three-dimensional layered chromium hydroxide nanospheres were heated to 900°C at a heating rate of 5°C / min in air, calcined at a constant temperature for 2 hours, cooled naturally, washed and dried to obtain nano-chromium trioxide products.

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Abstract

The invention discloses nano chromium sesquioxide and a preparation method thereof. The preparation method comprises the following steps: preparing a neutral or alkaline aqueous solution containing a hexavalent chromium compound and a reducing agent as a reaction solution, carrying out a hydrothermal reaction on the reaction solution at 200-280 DEG C, and carrying out post-treatment to obtain the three-dimensional layered chromium hydroxide monohydrate nanospheres, and the three-dimensional layered chromium hydroxide monohydrate nanospheres are roasted at the temperature of 800 DEG C to 1000 DEG C, and the nano chromium sesquioxide is obtained. Compared with the prior art, the preparation process of the nano chromium sesquioxide is simple and controllable, chromium loss can be effectively avoided, no chromium-containing waste residue is discharged, the obtained nano chromium sesquioxide is uniform and controllable in particle size and morphology, and the nano chromium sesquioxide has wide application prospects in multiple fields, such as preparation of high-end pigments, grinding materials and the like.

Description

technical field [0001] The invention specifically relates to a nano-chromium trioxide, a preparation method and application thereof, and belongs to the field of material science. Background technique [0002] Chromium trioxide is an important chemical raw material, which can be used as pigment, metallurgy, catalyst, etc. At present, the production methods of chromium trioxide are mainly ammonium sulfate-sodium red vanadium thermal decomposition method and chromic anhydride direct decomposition method. Among them, the ammonium sulfate-sodium alumite thermal decomposition method is the mainstream method for producing chromium oxide in the United States, Britain, Germany and other countries. (can make pigments, abrasives, refractory materials and metallurgical grade chromium oxide), suitable for large-scale production in rotary kilns, and basically no harmful gas is generated during the production process, so it has basically replaced the early pyrolysis method of sodium alum-...

Claims

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Application Information

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IPC IPC(8): C01G37/033
CPCC01G37/033C01P2002/72C01P2004/03C01P2004/62C01P2004/32
Inventor 李波张波梁建李武冯海涛董亚萍
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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