Method for preparing large-grain potassium fluotantalate by hydrothermal crystallization method

A technology of potassium fluorotantalate and hydrothermal crystallization, applied in chemical instruments and methods, tantalum compounds, inorganic chemistry, etc., can solve the problems of long crystallization time, small grain size, low purity of potassium fluorotantalate, etc., and achieve high solubility. , the effect of complete crystallization

Pending Publication Date: 2021-09-24
NINGXIA ORIENT TANTALUM IND
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[0005] This application provides a method for preparing large-grain potassium fluorotantalate by hydrothermal crystallization. The preparation of large-grain potassium fluorotantalate by hydrot

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  • Method for preparing large-grain potassium fluotantalate by hydrothermal crystallization method
  • Method for preparing large-grain potassium fluotantalate by hydrothermal crystallization method
  • Method for preparing large-grain potassium fluotantalate by hydrothermal crystallization method

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[0028] The terms and words used in this application should not be construed as being limited to commonly used meanings or dictionary meanings, and based on the principle that inventors can properly define the concept of terms in order to best describe their inventions, these terms and Words should be understood to have meanings and concepts consistent with the technical spirit of the present invention.

[0029] Reference throughout this specification to "a number of embodiments," "some embodiments," "one embodiment," or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one Examples. Thus, appearances of the phrases "in various embodiments," "in some embodiments," "in at least one other embodiment," or "in an embodiment" throughout this specification do not necessarily all refer to the same Example. Furthermore, the particular features, structures, or characteristics may be combine...

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Abstract

The invention relates to the technical field of potassium fluotantalate preparation methods, in particular to a method for preparing large-grain potassium fluotantalate by a hydrothermal crystallization method. The problems that potassium fluotantalate prepared through an existing method is low in purity, small in crystal grain, long in crystallization time and the like are solved. The method comprises the steps of adding hydrofluoric acid into a tantalum-containing solution to adjust the acidity, adding potassium chloride, and fully stirring to obtain a mixed solution; adding the mixed solution into a closed reaction kettle, heating to the temperature of 150-220 DEG C, keeping the constant temperature for 4-24 hours, and carrying out a synthetic reaction to obtain a potassium fluotantalate solution; and cooling the potassium fluotantalate solution to 25-30 DEG C in a gradient cooling manner, separating a sample from a mother solution, and washing and drying the sample to obtain the large-grain potassium fluotantalate.

Description

technical field [0001] The present application relates to the technical field of preparation methods of potassium fluorotantalate, in particular to a method for preparing large-grain potassium fluorotantalate by hydrothermal crystallization. Background technique [0002] Metal tantalum powder is mainly used to prepare tantalum capacitors. Tantalum capacitors are products that are small in size and can achieve large capacitance. It has excellent performance, high reliability, shock resistance and long service life. Potassium fluorotantalate (K 2 TaF 7 ) is the main raw material for the industrial production of metal tantalum powder. The tantalum powder prepared by the molten salt electrolyte composed of potassium fluorotantalate is used to manufacture high-quality capacitors (capacity is more than 5 times larger than that of ordinary capacitors of the same size), and is widely used Used in military equipment and high-tech fields, such as missiles, space vehicles, home appli...

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Application Information

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IPC IPC(8): C01G35/00
CPCC01G35/006C01P2002/85C01P2002/88C01P2006/80
Inventor 郭涛张伟宁张向楠张宇马东鹏李辉
Owner NINGXIA ORIENT TANTALUM IND
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