Process for purifying calcium fluoride from floated fluorite mine

A technology for purifying calcium fluoride from fluorite ore after flotation, applied in the direction of calcium/strontium/barium fluoride, calcium/strontium/barium halide, etc. Low content, unable to meet the quality standards of calcium fluoride for nuclear use, etc., to achieve the effect of simple process and strong operability

Pending Publication Date: 2021-11-23
JIAYUGUAN HONGSHENG ELECTRIC HEATING CO LTD
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Problems solved by technology

[0003] The content of active ingredient calcium fluoride in natural fluorite is low and contains more impurities, which cannot meet the quality standards of nuclear calcium fluoride

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  • Process for purifying calcium fluoride from floated fluorite mine

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Embodiment Construction

[0015] A process for purifying calcium fluoride from fluorite ore after flotation, comprising the following steps:

[0016] (1) Evenly mix the flotation fluorite ore powder with anhydrous sodium carbonate, and the mass of anhydrous sodium carbonate powder is 10% of the mass of fluorite powder.

[0017] (2) First cover a layer of sodium carbonate powder with a thickness of 3mm on the bottom of the nickel plate, then cover a layer of flotation fluorite powder and sodium carbonate powder mixture with a thickness of 75mm on the sodium carbonate powder, and finally cover the mixture with another layer Sodium carbonate powder with a thickness of 2mm; put the nickel plate into a high-temperature furnace to heat up at a heating rate of 10°C / min, heat to 840-860°C, keep the temperature constant for 3-6 hours, cool to room temperature naturally, and break to 200 meshes.

[0018] (3) Add the crushed fluorite powder to a hydrochloric acid solution with a concentration of 20% and a volume ...

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Abstract

The invention provides a process for purifying calcium fluoride from floated fluorite ore. The floated fluorite ore is taken as a raw material, a multi-time purification process is adopted, a corresponding treatment process for purification is formulated according to the characteristics of different impurities, a melting method for gasification decomposition and conversion, acid dissolution, alkali addition for silicon removal and carbonate addition for calcium and magnesium removal are implemented sequentially, acid is added to remove carbonate precipitate, and finally nuclear-grade high-quality calcium fluoride is obtained. Particularly, impurities which are insoluble in water are effectively converted into substances which are soluble in water through alkalifying and melting, and high-temperature decomposition of impurities such as organic matters and sulfate is realized, so that the content of impurity elements of the finally obtained product meets the requirement of nuclear-grade calcium fluoride, and the quality requirement of the nuclear-grade calcium fluoride is met.

Description

technical field [0001] The invention relates to a process for purifying calcium fluoride, in particular to a process for purifying calcium fluoride from fluorite ore after flotation. Background technique [0002] In the process of preparing uranium metal, the nuclear industry generally adopts the method of calcium reduction of uranium tetrafluoride. In order to avoid the introduction of impurities into the metal uranium due to the melting of the metal container at high temperature, the reaction material and the reaction metal container are lined with reaction by-products. Calcium fluoride, the same substance, is made of nuclear-grade calcium fluoride into a crucible as a reaction vessel, thereby avoiding secondary pollution to the purified uranium metal. Due to the particularity of use, nuclear-grade calcium fluoride has extremely high requirements on purity, reaching the standard of superior purity of chemical reagents. In order to meet the requirements of nuclear-use calci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/22
CPCC01F11/22C01P2006/80
Inventor 寇建国周晓东付崇斐
Owner JIAYUGUAN HONGSHENG ELECTRIC HEATING CO LTD
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