Method for synthesizing sphene

A synthesis method and technology of sphene are applied in the fields of high radioactive waste disposal, solidification treatment of artificial rock, and synthesis of sphene, which can solve the problems of expensive raw materials, secondary pollution, complicated process, etc., to simplify the solidification treatment process, The effect of reducing secondary pollution and simple process

Inactive Publication Date: 2007-11-14
SOUTHWEAT UNIV OF SCI & TECH
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Problems solved by technology

[0007] (1) In the process of synthesizing titanite, Si and Ti are introduced in the form of raw materials such as hexafluoroepoxy silicic acid, tetraethylorthosilicate, titanium oxychloride, n-butyl titanate, titanyl borate, etc., Raw materials are expensive, which is not conducive to engineering applications
[0008] (2) The liquid phase method is used to synthesize titanite. There are many procedures, the process is complicated, and the process control requirements are high. Secondary pollution is prone to occur in the actual solidification of radioactive waste.

Method used

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  • Method for synthesizing sphene

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Embodiment 1

[0031] A synthetic method of titanite, comprising the following steps:

[0032] (1) Raw material and composition: take raw material calcium carbonate (CaCO 3 ), titanium dioxide (TiO 2 ) and silicon dioxide (SiO 2 ); The percentage by weight of raw materials is composed of: silicon dioxide (SiO 2 ) 25.02wt.%, calcium carbonate (CaCO 3 )41.7wt.%, titanium dioxide (TiO 2 ) 33.28wt.%.

[0033] (2) Ball milling and drying: the raw materials are batched according to the weight percentage, and then put into a ball mill (such as a planetary mill) for wet fine grinding for 240 minutes, so that the powder is fine enough and mixed uniformly; The material is dried at 70°C;

[0034] (3) Calcination: calcining the finely ground and dried material at 1320°C for 30 minutes to obtain high-purity titanite (CaTiSiO 5 ).

Embodiment 2

[0036] A kind of synthetic method of titanite, with metasilicate (H 2 SiO 3 ), calcium carbonate (CaCO 3 ), titanium dioxide (TiO 2 ) is the raw material, and the weight percentage of the raw material is composed of: metasilicate 30.27wt.%, CaCO 3 38.78wt.%, TiO 230.95 wt.%. Weigh the above-mentioned substances according to the weight percentage of the raw materials, and finely grind them in a ball mill (such as a planetary mill) for 210 minutes to obtain powders with fine particle size and uniform composition. The finely ground powder was dried at 50°C, calcined at 1280°C and kept for 30 minutes to obtain high-purity titanite (CaTiSiO 5 ).

Embodiment 3

[0038] A kind of synthetic method of titanite, with calcium carbonate (CaCO 3 ), titanium dioxide (TiO 2 ) and silicon dioxide (SiO 2 ) is a raw material; the weight percent example of raw material consists of: silicon dioxide 25.52wt.% (weight percent), CaCO 3 40.7wt.%, TiO 2 33.78 wt.%. Weigh the above-mentioned substances according to the weight percentage of raw materials, and finely grind them in a ball mill (such as a planetary mill) for 240 minutes to obtain powders with fine particle size and uniform composition. The finely ground powder was dried at 70°C, calcined at 1290°C and held for 60 minutes to obtain high-purity titanite (CaTiSiO 5 ).

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Abstract

This invention relates to synthetic method of a kind of sphene. According to weight, the raw material includes: calcium carbonate 35 to 45%, titanium dioxide 27 to 37%, silica 22 to 29% or metasillicio acid 27 to 34%. The process includes: blend the ingredient, then enclose to ball mill to take wet method fine grinding for 180 to 300 minutes, drying the material, calcinate the material at 1100 to 1350deg for 30 to 60 minutes, then gain high-purity sphene.

Description

technical field [0001] The invention belongs to the preparation of artificial rocks, and relates to a titanite (CaTiSiO 5 ) synthesis method, which is suitable for high radioactive waste disposal and artificial rock solidification treatment. Background technique [0002] The radioactive waste produced by various nuclear reactors, nuclear power plants and other devices is quite harmful and cannot be discharged directly to the environment. It must be solidified by a suitable method and stored in isolation by an appropriate device until the radioactive elements in it decay to no effect on the environment. up to the hazard. The solidification treatment and disposal technology of low-level radioactive waste is relatively mature and has been widely used. The solidification treatment and disposal technology of high-level radioactive waste is still in the research stage, and large-scale engineering application has not been realized. How to solidify and treat high-level radioactiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/16C04B35/22C04B35/622
Inventor 滕元成曾冲盛
Owner SOUTHWEAT UNIV OF SCI & TECH
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