Method and device for preparing sandy cryolite from fluoride waste water

A cryolite and waste water technology, applied in aluminum fluoride, aluminum halide and other directions, can solve the problems of difficult solid-liquid separation, high water content, small particle size of cryolite, etc., and achieve the effect of avoiding environmental pollution and wide application range.

Pending Publication Date: 2017-06-13
WUHAN INSTITUTE OF TECHNOLOGY
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Problems solved by technology

[0004] At present, most of the research on the preparation of cryolite from fluorine-containing wastewater focuses on the recovery rate of

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  • Method and device for preparing sandy cryolite from fluoride waste water
  • Method and device for preparing sandy cryolite from fluoride waste water

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[0031] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0032] see figure 1 and figure 2, a device for preparing sandy cryolite using fluorine-containing waste water, including a fluidized bed reactor 1, a waste water tank 2, a medicine tank 3, and a water collecting tank 4. The fluidized bed reactor 1 consists of a sedimentation zone 14, a transition zone 13, a reaction zone 12, and a water distribution zone 11 in order from top to bottom, and the central axes of the sedimentation zone 14, the transition zone 13, the reaction zone 12, and the water distribution zone 11 are the same Straight line; between the reaction zone 12 and the water d...

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Abstract

The invention discloses a device for preparing sandy cryolite from fluoride waste water. The device comprises a fluidized bed reactor, a waste water tank, a chemical box and a water collecting box, wherein a water inlet of the fluidized bed reactor is connected with the waste water groove through a water inlet pump; a chemical inlet of the fluidized bed reactor is connected with the chemical box through a chemical feeding pump; a water outlet of the fluidized bed reactor is connected with the water collecting groove; a backflow outlet of the fluidized bed reactor is connected with a backflow inlet of the fluidized bed reactor through a backflow pump; cryolite crystal seeds are arranged in the fluidized bed reactor; a sampling opening is formed in the fluidized bed reactor. The invention also provides a method for preparing the sandy cryolite from the fluoride waste water. The fluorine can be recovered from the waste water for preparing the sandy cryolite.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of industrial waste resources, and in particular relates to a method and a device for preparing sandy cryolite by utilizing fluorine-containing wastewater. Background technique [0002] Excessive fluorine in water can lead to diseases such as osteoporosis and arthritis, and also affect plant metabolism, photosynthesis, and respiration. At present, the commonly used treatment methods for fluorine-containing wastewater at home and abroad include chemical precipitation, electrocoagulation, reverse osmosis, ion exchange, membrane separation and adsorption. Although these methods have good removal effect, they do not utilize the fluorine therein, resulting in a waste of resources. [0003] Cryolite, also known as sodium fluoroaluminate, has the molecular formula Na 3 AlF 6 , white fine crystals. As a chemical product, cryolite is mainly used as a flux for smelting metal aluminum, and can al...

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Application Information

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IPC IPC(8): C01F7/54
CPCC01F7/54
Inventor 张莉李兰田凌霄
Owner WUHAN INSTITUTE OF TECHNOLOGY
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