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Preparation process of calcium stannate ceramic material precursor

A ceramic material and preparation technology, which is applied in the field of new preparation technology of calcium stannate ceramic material precursor, can solve the problems of low conversion rate of SnO2, complex process of calcium stannate, low product purity, etc., shorten the roasting time, reduce The effect of secondary pollution and high product purity

Active Publication Date: 2013-12-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Preparation process of calcium stannate ceramic material precursor
  • Preparation process of calcium stannate ceramic material precursor
  • Preparation process of calcium stannate ceramic material precursor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Chemically pure tin dioxide (SnO 2 content of 99.15%) and calcium carbonate (CaCO 3 Content is 99.5%) as raw material. Mix the finely ground tin dioxide and calcium carbonate in a molar ratio of 1:1, add 1% slaked lime and 12% water, and mix evenly; then use a disc pelletizer to pellet the mixture, and after drying , placed in a controlled-atmosphere static muffle furnace for heating and roasting, the roasting temperature was 900°C, the roasting time was 30min, and the roasting atmosphere consisted of CO and CO 2 The composition of the mixed gas, where the volume concentration of CO [CO / (CO+CO 2 )] is 15%. After the calcined mass is cooled, it is crushed and ground to obtain a calcium stannate ceramic precursor. The conversion rate of Sn was 99.4%.

[0039] The XRD analysis of the sample obtained under the experimental conditions is shown in the appendix figure 2 , from attached figure 2 It can be seen that all the diffraction peaks correspond to calcium stanna...

Embodiment 2

[0041] Industrial grade tin dioxide (SnO 2 content of 97%) and calcium oxide (CaO content of 98%) as raw materials. Mix the finely ground tin dioxide and calcium oxide in a molar ratio of 1:1.05, add 1% bentonite and 15% water, and mix evenly; then use a double-roller briquetting machine to briquette the mixture and dry it. Finally, put it into a simulated annular rotary hearth furnace device for heating and roasting, the roasting temperature is 800 °C, the roasting time is 45 min, and the roasting atmosphere is composed of CO and CO 2 The composition of the mixed gas, where the volume concentration of CO [CO / (CO+CO 2 )] is 10%. After the calcined mass is cooled, it is crushed and ground to obtain a calcium stannate ceramic precursor. The conversion rate of Sn was 99.2%.

Embodiment 3

[0043] Industrial grade tin dioxide (SnO 2 content of 97%) and calcium carbonate (CaCO 3 Content is 98%) as raw material. Mix the finely ground tin dioxide and calcium oxide in a molar ratio of 1:1.05, add 2% slaked lime and 13% water, and mix evenly; then use a double-roller briquetting machine to briquette the mixture and dry it. Finally, put it into a simulated tunnel kiln device for heating and roasting, the roasting temperature is 1000 ° C, the roasting time is 15 min, and the roasting atmosphere is composed of CO and CO 2 The composition of the mixed gas, where the volume concentration of CO [CO / (CO+CO 2 )] was 17%. After the calcined mass is cooled, it is crushed and ground to obtain a calcium stannate ceramic precursor. The conversion rate of Sn was 99.1%.

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Abstract

The invention provides a preparation process of a calcium stannate ceramic material precursor. The preparation process comprises the following steps: respectively grinding stannic oxide and calcium carbonate (or calcium oxide) into powder with certain granularity; mixing the stannic oxide and the calcium carbonate (or calcium oxide) at the Sn:Ca molar ratio of 1:(1-1.1) to obtain a mixed material; agglomerating and drying the mixed material; placing the mixed material into CO / CO2 atmosphere, heating and roasting, wherein the roasting temperature is 800 to 1,000 DEG C, the roasting time is 15 min to 60 min, and the CO volume concentration [CO / (CO+CO2)] of the roasting atmosphere is 10% to 25%; and cooling, crushing and levigating the roasted product to obtain the calcium stannate ceramic material precursor. The process has the characteristics of low sintering temperature, short roasting time, high stannum conversion rate, short process flow, simplicity and convenience in operation and the like. The whole roasting process is performed under a solid condition, without a special requirement on roasting equipment, so that the industrialized production is easy to realize.

Description

technical field [0001] The invention relates to the field of synthesis technology of inorganic ceramic materials, in particular to a new preparation technology of calcium stannate ceramic material precursor. Background technique [0002] Tin dioxide can form stannate compounds with various metal ion compounds. As an important class of dielectric materials, stannate 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. Due to the high dielectric constant of calcium stannate (ε=16), the sintering performance is the best, and my country's cassiterite and calcite resources are relatively rich, so the production of capacitor ceramics based on calcium stannate is relatively common. [0003] The preparation methods of calcium stannate mainly inclu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/00C04B35/457
Inventor 张元波姜涛李光辉苏子键刘兵兵游志雄范晓慧黄柱成郭宇峰杨永斌李骞陈许玲朱忠平周友连罗伟张永建吴玉东赵熠饶明军徐斌
Owner CENT SOUTH UNIV
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