Hydrothermal treatment method of ceramic oxide composite powder

A ceramic oxide and hydrothermal treatment technology, which is applied in the field of hydrothermal treatment of ceramic oxide composite powder, can solve the problems of difficult process stability, increased ceramic raw material cost, complex reaction system, etc., and achieves narrow particle size distribution range, raw material The effect of cost reduction and simple process

Pending Publication Date: 2018-12-18
GUIZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still many defects in the current hydrothermal method, which are mainly reflected in: 1. The current hydrothermal method must utilize the soluble salt (mainly nitrate) of doping elements as raw material, react with alkali, and finally obtain oxides, but the price of soluble salts is much more expensive than that of oxides, which increases the raw material cost of ceramics; 2. The amount of oxides finally produced by soluble salts of doped elements is only a small part of the amount of soluble salts ( Taking the soluble nitrate of cobalt oxide-cobalt nitrate hexahydrate as an example, after the treatment is completed, the cobalt oxide is 26%, and the remaining 74% is nitrate and crystal water), therefore, a large amount of soluble salt and alkali are required to react , which further increases the raw material cost of ceramics. At the same time, the waste liquid contains a large amount of acid radicals, which pollutes the environment; 3. The reaction system of soluble salts and alkalis is more complicated and the conditions are harsher, and the stability of the process in the treatment process is relatively high. Difficult to grasp

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  • Hydrothermal treatment method of ceramic oxide composite powder
  • Hydrothermal treatment method of ceramic oxide composite powder
  • Hydrothermal treatment method of ceramic oxide composite powder

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Experimental program
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Effect test

Embodiment 1

[0031] Embodiment 1: a kind of hydrothermal treatment method of ceramic oxide composite powder, comprises the following steps:

[0032] 1) Weigh the oxide raw material according to the required ratio of ceramics;

[0033] 2) Put the oxide raw material into a ball mill tank, add deionized water and then fully mix the ball mill, place the slurry obtained after ball milling in a drying oven at 70°C to dry to obtain oxide composite powder;

[0034] 3) Put the oxide composite powder into the reaction kettle, add deionized water at a mass ratio of 1:1, then add ammonia water, seal the reaction kettle, and then heat for hydrothermal treatment. The treatment temperature of the hydrothermal treatment is 300 ° C; the water The treatment time of heat treatment is 15 hours. In the reaction system of hydrothermal treatment, the concentration of ammonia water is 1mol / L, and the powder after hydrothermal treatment can be dried in a drying oven at 70°C.

Embodiment 2

[0035] Embodiment 2: a kind of hydrothermal treatment method of ceramic oxide composite powder, comprises the following steps:

[0036] 1) Weigh the oxide raw material according to the required ratio of ceramics;

[0037] 2) Put the oxide raw material into a ball mill tank, add deionized water, mix the ball mill thoroughly, and place the slurry obtained after ball milling in a drying oven at 60°C to dry to obtain the oxide composite powder;

[0038] 3) Put the oxide composite powder into the reaction kettle, add deionized water according to the mass ratio of 1:0.5, then add citric acid, seal the reaction kettle, and then heat for hydrothermal treatment. The treatment temperature of hydrothermal treatment is 200°C; The treatment time of hydrothermal treatment is 25 hours, the concentration of citric acid in the reaction system of hydrothermal treatment is 0.5mol / L, and the powder after hydrothermal treatment can be dried in a drying oven at 60°C.

Embodiment 3

[0039] Embodiment 3: a kind of hydrothermal treatment method of ceramic oxide composite powder, comprises the following steps:

[0040] 1) Weigh the oxide raw material according to the required ratio of ceramics;

[0041] 2) Put the oxide raw material into a ball mill tank, add alcohol and fully mix the ball mill, place the slurry obtained after ball milling in a drying oven at 80° C. to dry to obtain oxide composite powder;

[0042] 3) Put the oxide composite powder into the reaction kettle, add deionized water according to the mass ratio of 1:0.8, then add oxalic acid, seal the reaction kettle, and then heat for hydrothermal treatment. The treatment temperature of hydrothermal treatment is 250 ° C; the water The heat treatment time is 20 hours. In the reaction system of hydrothermal treatment, the concentration of oxalic acid is 0.8mol / L. The powder after hydrothermal treatment can be dried in a drying oven at 65°C.

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Abstract

The invention discloses a hydrothermal treatment method of ceramic oxide composite powder. The method comprises the following steps that (1) oxide raw materials are weighed according to the required proportion of ceramics; (2) the oxide raw materials are charged into a ball grinding tank; after deionized water or alcohol is added, full mixing and ball grinding are performed; slurry obtained afterthe ball grinding is put into a drying box to be dried; ceramic oxide composite powder is obtained; (3) the ceramic oxide composite powder is added into a reaction kettle; a certain quantity of de-ionized water is added; then, one or several any kinds of compositions of ammonium hydroxide, citric acid or oxalic acid are added; the reaction kettle is sealed; then, heating is performed for hydrothermal treatment; the powder after the hydrothermal treatment is dried in the drying box. The hydrothermal treatment method has the characteristics that the material consumption is low; the cost is low;the pollution is little; the process is simpler; the process stability is high.

Description

technical field [0001] The invention relates to a treatment method for ceramic oxide composite powder, in particular to a hydrothermal treatment method for ceramic oxide composite powder. Background technique [0002] The composition of ceramics usually includes several oxide raw materials or even more than a dozen oxide raw materials. The proportion of some oxide raw materials in the ceramic formula is very low, ranging from a few percent to a few thousandths. Moreover, the particle size of these oxide raw materials varies greatly due to different manufacturers, different production batches, and different production and preparation methods. The particle size of the oxide raw materials is roughly between a few microns and tens of microns. How to evenly disperse a small amount of large-grained oxide raw materials into ceramics is the focus of scientific research and technical personnel. [0003] At present, the ball milling method is generally used for the treatment of oxide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/626
CPCC04B35/622C04B35/62605C04B35/62655
Inventor 庞驰赵文英方超郑德一周芳
Owner GUIZHOU UNIV
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