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Method for preparing calcium tantalate powder

A technology of calcium tantalate and powder, which is applied in the field of preparation of calcium tantalate powder, which can solve the problems of restricting the production of calcium tantalate powder and long time consumption, and achieve the effect of meeting requirements, low preparation cost and high purity

Inactive Publication Date: 2014-12-24
BOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional solid-state reaction technology for preparing calcium tantalate powder takes a long time and requires high temperature conditions. The reaction is usually carried out at 1100-1300°C, which limits the production of calcium tantalate powder.

Method used

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  • Method for preparing calcium tantalate powder
  • Method for preparing calcium tantalate powder
  • Method for preparing calcium tantalate powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Accurately weigh calcium nitrate, tantalum pentachloride and urea, put them into methanol aqueous solution (volume ratio 1:1) and stir to dissolve for more than 30 minutes. The solution was subjected to a cross-linking reaction at 200 °C for 12 h. After the reaction, it was naturally cooled to room temperature, mixed with calcium chloride molten salt, and then put into a mortar and ground finely for 30 minutes. The molar ratios of calcium nitrate, tantalum pentachloride, calcium chloride molten salt and urea are 2:1:8:200 in sequence. Put the above mixture into a crucible and put it into a box-type resistance furnace for calcination reaction. The reaction temperature is 900 °C, and the reaction time is 10 h. After cooling, wash and dry with water to prepare calcium tantalate powder. The purity of its products is not less than 99.73%, and the impurity content: carbon is less than 0.13%; chlorine is less than 0.09%. Under the condition of ultraviolet light (main waveleng...

Embodiment 2

[0031] Accurately weigh calcium chloride, tantalum pentachloride and urea and put them into aqueous methanol solution (volume ratio 1:1) and stir to dissolve for more than 30 minutes. The solution was subjected to a cross-linking reaction at 200 °C for 12 h. After the reaction, it was naturally cooled to room temperature, mixed with calcium chloride molten salt, and then put into a mortar and ground finely for 30 minutes. The molar ratios of the above-mentioned calcium chloride, tantalum pentachloride, calcium chloride molten salt and urea are 2:1:8:100 in sequence. Put the above-mentioned mixture into a crucible and put it into a box-type resistance furnace for calcination reaction. The reaction temperature is 1000 °C and the reaction time is 4 h. After cooling, it is washed with water and dried to prepare calcium tantalate powder. The purity of its products is not less than 99.71%, and the impurity content: carbon is less than 0.08%; chlorine is less than 0.11%. Under the c...

Embodiment 3

[0033] Accurately weigh calcium nitrate, tantalum pentaethoxide and citric acid, put them into aqueous methanol solution (volume ratio 1:1) and stir to dissolve for more than 30 minutes. The solution was subjected to a cross-linking reaction at 500 °C for 2 h. After the reaction, it was naturally cooled to room temperature, mixed with calcium chloride molten salt, and then put into a mortar and ground finely for 30 minutes. The molar ratios of calcium nitrate, tantalum pentaethoxide, molten calcium chloride and citric acid are 2:1:8:100 in sequence. Put the above mixture into a crucible and put it into a box-type resistance furnace for calcination reaction. The reaction temperature is 800 °C and the reaction time is 24 h. After cooling, it is washed with water and dried to prepare calcium tantalate powder. The purity of its products is not less than 99.83%, and the impurity content: carbon is less than 0.08%; chlorine is less than 0.02%. Under the condition of ultraviolet lig...

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Abstract

The invention discloses a method for preparing calcium tantalate powder. The method is characterized in that soluble calcium salt, soluble tantalum salt and a crosslinking agent are sufficiently dissolved in a methyl alcohol and water mixed solution, have a crosslinking reaction at a certain temperature, are mixed with fused salt, and are ground to be sufficiently mixed; after a high-temperature reaction, the temperature is lowered to a room temperature, and then water washing and drying are performed, so that a target product, namely the calcium tantalate powder, is obtained. According to the method, the mole ratio of the soluble calcium salt, the tantalum salt, the fused salt and the crosslinking agent is 2:1:8:(20-200); the soluble calcium salt is one or the mixture of calcium chloride or calcium nitrate; the soluble tantalum salt is one or the mixture of tantalum chloride or tantalum pentaethoxide; the crosslinking agent is one or the mixture of urea or citric acid. The method has the advantages of high technological purity, low impurity content and low preparation cost for products, and is suitable for industrial production, and the products can be used in ferroelectric, photoelectric, photocatalysis, fuel cell and other fields.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic non-metallic materials, and in particular relates to a method for preparing calcium tantalate powder. Background technique [0002] Hydrogen energy is considered to be one of the ideal green energy sources, and the technology of producing hydrogen through photolysis of water is a more ideal way to produce hydrogen, which has been attracting much attention. The technology of hydrogen production by photolysis of water began in 1972, when two professors, Fujishima A and Honda K of the University of Tokyo, Japan first reported the discovery of TiO 2 The single-crystal electrode photocatalytically splits water to generate hydrogen, which reveals the possibility of using solar energy to directly split water to produce hydrogen. A large class of compounds such as tantalates are used as photocatalysts in the field of photolysis of water to produce hydrogen. The main research object, calc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G35/00B01J23/20
Inventor 许家胜张杰
Owner BOHAI UNIV
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