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Method and equipment for purifying calcium fluoride from decarbonated fluorine-containing solid waste

A technology for purifying calcium fluoride and solid waste, applied in the direction of calcium/strontium/barium fluoride, calcium/strontium/barium halide, etc., can solve problems such as complex process, achieve high yield and purity, and improve yield

Active Publication Date: 2022-05-17
深圳市考拉生态科技有限公司
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Problems solved by technology

The process is more complicated; two to three precipitations are required, and the sediment needs to be ground to powder after pressure filtration and drying

Method used

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  • Method and equipment for purifying calcium fluoride from decarbonated fluorine-containing solid waste
  • Method and equipment for purifying calcium fluoride from decarbonated fluorine-containing solid waste
  • Method and equipment for purifying calcium fluoride from decarbonated fluorine-containing solid waste

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Embodiment Construction

[0066] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by persons of ordinary skill in the art on the premise of understanding the inventive concepts of the present invention all fall within the protection scope of the present invention.

[0067] It should be noted that if there is a directional indication (such as up, down, left, right, front, back...) in the embodiment of the present invention, the directional indication is only used to explain the position in a certain posture (as shown in the accompanying drawing). If the specific posture changes, the directional indication will also change accordingly.

[0068] In order to unde...

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Abstract

It relates to a method and equipment for purifying calcium fluoride from decarbonated fluorine-containing solid waste. The method is to perform selective acid leaching on the fluorine-containing solid waste from which carbonate has been removed, and use hydrofluoric acid solution to remove di Silicon oxide; after acid-solid-liquid separation, the separated silicon-containing fluorine-containing solid waste and silicon-containing fluoric acid waste acid liquid are obtained; the silicon-containing fluorine-containing solid waste is rinsed in the first cycle and dried to obtain the finished product of calcium fluoride; recycling Regenerate the silicofluoric acid in the waste acid solution containing silicofluoric acid, take the solid and dry to obtain the fluorosilicate solid and separate the recovered acid for mixing with the acid leaching solution of selective acid leaching; when the leaching in the first cycle rinsing If the acidity of the solution exceeds the lower pH threshold, it is exported and used for second precipitation and solid-liquid separation using calcium salts to obtain separated calcium fluoride and calcium chloride. The invention can individually purify calcium fluoride, calcium chloride and fluorosilicate solids from fluorine-containing solid waste with high efficiency, use hydrofluoric acid with high efficiency, and realize the discharge of zero waste acid waste water.

Description

technical field [0001] The invention relates to a recycling technology for fluorine-containing solid waste, in particular to a method and equipment for purifying calcium fluoride from decarbonated fluorine-containing solid waste. Background technique [0002] Industrial solid waste, especially hazardous waste, is known as a "tumor" that endangers the environment. It is large in volume and pollutes the environment. If it cannot be treated effectively, it will not only endanger the environment and people's physical and mental health, but also greatly restrict economic development. At present, there is a huge gap in my country's industrial solid waste treatment capacity. In terms of comprehensive utilization of industrial solid waste, it has not really achieved efficient utilization. The treatment method is basically still in the process of purifying (extracting) a part of it, and most of it has not been fully utilized. The waste water and waste residues that are discarded or pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/22
CPCC01F11/22C01P2006/80
Inventor 邵宗强黄燕生王淼
Owner 深圳市考拉生态科技有限公司
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