Simple, convenient and environment-friendly preparation method for beta-eucryptite powder

A technology of eucryptite powder and eucryptite, which is applied in the direction of aluminum silicate, silicate, etc., can solve the problems of unsuitable large-scale production, long preparation period of sol-gel method harmful to health, environmental pollution, etc., and meet the equipment requirements Low, large negative expansion coefficient, high purity effect

Inactive Publication Date: 2017-02-08
BEIJING SINOMA SYNTHETIC CRYSTALS CO LTD
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Problems solved by technology

Among them, the gel-sol method uses one or more organic acids in the process of preparing the precursor, which will inevitably cause certain pollutio

Method used

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  • Simple, convenient and environment-friendly preparation method for beta-eucryptite powder
  • Simple, convenient and environment-friendly preparation method for beta-eucryptite powder

Examples

Experimental program
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specific Embodiment approach 1

[0008] Specific embodiment one: the preparation steps of β-eucryptite in the present embodiment are as follows: take analytically pure lithium carbonate, silicon dioxide and α-alumina in an equimolar ratio, put the above-mentioned complex into a quick mill, and Grinding the mixed materials in the rapid mill for 1-3 hours, putting the mixed raw materials into an alumina sagger, placing them in a high-temperature furnace and calcining at 1200°C-1300°C for 1-3 hours to prepare β-eucryptite.

specific Embodiment approach 2

[0009] Embodiment 2: This embodiment differs from Embodiment 1 in that the calcination temperature is 1200°C-1300°C, the calcination time is 4-8 hours, and other steps are the same as Embodiment 1.

specific Embodiment approach 3

[0010] Embodiment 3: This embodiment differs from Embodiment 1 in that the calcination temperature is 1300°C-1350°C, the calcination time is 4-6 hours, and other steps are the same as Embodiment 1.

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Abstract

The invention relates to a solid-phase preparation method for beta-eucryptite powder. The preparation method comprises the following steps: 1) weighing lithium carbonate, silica and alpha-alumina according to equimolar proportion; 2) subjecting the raw materials weighed in the step 1) to grinding and mixing in a rapid grinding device; and 3) filling an alumina saggar with the raw materials ground and mixed in the step 2), placing the alumina saggar in a high-temperature furnace and carrying out calcining so as to obtain desired beta-eucryptite powder. The preparation method is simple in process, low in equipment requirement, nontoxic and pollution-free; the prepared beta-eucryptite powder has high purity; and the preparation method is suitable for batch production.

Description

technical field [0001] The invention relates to a preparation method of solid phase synthesis of β-eucryptite powder Background technique [0002] Negative thermal expansion (NTE) materials are widely used in high-end technical fields such as aerospace, precision optical instruments, and electronic devices because of their extremely low thermal expansion coefficient and excellent thermal shock resistance. [0003] β-eucryptite is one of the few materials with a large negative expansion coefficient in nature. Commonly used methods for artificially synthesizing β-eucryptite include sol-gel method and solid-state reaction method. Among them, the gel-sol method uses one or more organic acids in the process of preparing the precursor, which will inevitably cause certain pollution to the environment, and is harmful to health. The preparation period of the sol-gel method is very long, and it is not suitable for Large-scale production. For the preparation of β-eucryptite powder b...

Claims

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Application Information

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IPC IPC(8): C01B33/26
CPCC01B33/26C01P2002/72C01P2006/90
Inventor 赵春霞范仕刚王增辉刘杰何粲
Owner BEIJING SINOMA SYNTHETIC CRYSTALS CO LTD
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