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Method for preparing alkali earth metal stannate

An alkaline earth metal and stannate technology, which is applied in chemical instruments and methods, tin compounds, inorganic chemistry, etc., can solve the problems of low SnO2 conversion rate, complicated alkaline earth metal stannate process, and restricting the popularization and application of process methods. The effect of shortened roasting time, short roasting time and high tin conversion rate

Active Publication Date: 2015-07-15
CENT SOUTH UNIV
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Problems solved by technology

The process of preparing alkaline earth metal stannate by this method is also more complicated, and the required time is longer, and the purity of the product is not high, and SnO 2 The conversion rate is low, and the product is often mixed with M 2 SnO 4 , SnO 2 and other impurities, which also restricts the popularization and application of this process method

Method used

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  • Method for preparing alkali earth metal stannate
  • Method for preparing alkali earth metal stannate
  • Method for preparing alkali earth metal stannate

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Use tin dioxide and calcium carbonate with a purity of 99.5% as raw materials, grind them until the mass percentage of -0.074mm particle size is not less than 80%, and then mix the two evenly according to the Sn:Ca molar ratio of 1: 1; dry the mixture After that, put it into the roaster under CO / CO 2 Atmosphere heating and roasting, the roasting temperature is 600°C, the roasting time is 120min, the volume concentration of CO [CO / (CO+CO 2 )] is 5%; the roasted product is cooled and taken out to obtain calcium stannate (CaSnO 3 ). The calculated conversion rate of tin is 98.9%.

[0033] The XRD result of the prepared product under this condition is as attached figure 1 shown. From attached figure 1 It can be seen that the substance corresponding to all the diffraction peaks is calcium stannate (CaSnO 3 ), indicating that the purity of calcium stannate in the obtained product is high. figure 1 No diffraction peaks were found for other impurities.

Embodiment 2

[0035] Use tin dioxide and calcium oxide with a purity of 99.5% as raw materials, grind them separately until the mass percentage of -0.074mm particle size is not less than 80%, and then mix the two evenly according to the Sn:Ca molar ratio of 1: 1.09; dry the mixture After that, put it into the roaster under CO / CO 2 Atmosphere heating and roasting, the roasting temperature is 800°C, the roasting time is 60min, the volume concentration of CO [CO / (CO+CO 2 )] is 15%; the roasted product is cooled and taken out to obtain calcium stannate (CaSnO 3 ). The conversion rate of tin was 99.1%.

Embodiment 3

[0037] Use tin dioxide and calcium carbonate with a purity of 99.5% as raw materials, grind them separately until the mass percentage of -0.074mm particle size is not less than 80%, and then mix the two evenly according to the Sn:Ca molar ratio of 1: 1.2; dry the mixture After that, put it into the roaster under CO / CO 2 Atmosphere heating and roasting, the roasting temperature is 1200°C, the roasting time is 10min, the volume concentration of CO [CO / (CO+CO 2 )] is 20%; the roasted product is cooled and taken out to obtain calcium stannate (CaSnO 3 ). The conversion rate of tin was 99.2%.

[0038] (2) Preparation of strontium stannate:

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Abstract

The invention provides a method for preparing alkali earth metal stannate, which comprises the following steps: respectively grinding tin dioxide and alkali earth metal carbonate (CaCO3 / SrCO3 / BaCO3) or oxide (CaO / SrO / BaO) to a certain particle size, uniformly mixing according to a certain mol ratio, and heating and roasting the mixture in a CO / CO2 atmosphere, thereby obtaining the roasted product alkali earth metal stannate. Compared with the traditional method for preparing alkali earth metal stannate by a solid-phase sintering process, the invention has the characteristics of high stannum conversion rate, low roasting temperature, short roasting time, low cost and the like.

Description

technical field [0001] The invention relates to the field of preparation methods of stannates, and specifically provides a preparation method of alkaline earth metal stannates. Background technique [0002] Tin dioxide can form stannate compounds with various metal ion compounds. As an important class of dielectric materials, alkaline earth metal stannate MSnO 3 (M = Ca, Sr, Ba) has attracted much attention due to its wide application in the electronics industry, especially in thermally stable capacitors and gas sensors. Due to their unique dielectric properties, calcium, strontium, and barium stannates are widely used to prepare high-frequency ceramic capacitors. In addition, due to CO, H 2 S, butane, CH 4 , LPG, CH 3 Gases such as SH and NOx are gas sensitive, and alkaline earth metal stannates are also commonly used to make gas sensors. [0003] Alkaline earth metal stannate MSnO 3 The preparation methods of (M=Ca, Sr, Ba) mainly include solid phase sintering met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G19/00
Inventor 张元波李光辉姜涛苏子键刘兵兵范晓慧黄柱成郭宇峰杨永斌李骞陈许玲朱忠平游志雄周友连张永建罗伟吴玉东赵熠饶明军徐斌
Owner CENT SOUTH UNIV
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