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A method for recovering fluorine resources in acidic fluorine-containing wastewater

A recovery method and waste water technology, which is applied to the recovery of fluorine resources in acidic fluorine-containing wastewater, and in the field of recovery of fluorine resources in acidic fluorine-containing wastewater, can solve the problems of difficult regeneration of adsorbent, complicated treatment process, and large lime consumption, etc., and achieve The effect of saving material consumption, good economy and wide application

Active Publication Date: 2020-04-03
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the existing technical solutions for the treatment and recovery of fluorine in fluorine-containing wastewater, there are problems such as large lime consumption, difficulty in regeneration of adsorbent, large amount of use, complicated treatment process and high treatment cost. Recycling method of resources

Method used

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  • A method for recovering fluorine resources in acidic fluorine-containing wastewater
  • A method for recovering fluorine resources in acidic fluorine-containing wastewater

Examples

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Embodiment 1

[0061] This example provides a method for recovering fluorine resources in acidic fluorine-containing wastewater. The acidic fluorine-containing wastewater is fluorine-containing acidic wastewater from a niobium-tantalum hydrometallurgy enterprise, and its main chemical components are listed in Table 1. Show:

[0062] Table 1: Contents of chemical components in fluorine-containing acidic wastewater from a niobium-tantalum hydrometallurgy enterprise

[0063]

[0064] The method comprises the steps of:

[0065] (1) Evaporate the acidic fluorine-containing wastewater at 100°C and a vacuum of 90kPa to obtain an evaporation condensate and an evaporation concentrate; the evaporation concentrate is cooled to obtain titanium-rich and iron-rich solid slag and the The liquid phase is the main component, and the liquid phase is neutralized with lime milk for harmless disposal, and can also replace concentrated sulfuric acid for the preparation of anhydrous hydrogen fluoride or be rec...

Embodiment 2

[0071] This embodiment provides a method for recovering fluorine resources in acidic fluorine-containing wastewater. The acidic fluorine-containing wastewater is fluorine-containing acidic wastewater from a niobium-tantalum hydrometallurgy enterprise, and its main chemical component content is the same as that in Example 1. same.

[0072] The method comprises the steps of:

[0073] (1) Evaporate acidic fluorine-containing waste water at 180°C under atmospheric pressure to obtain evaporation condensate and evaporation concentrate; the evaporation concentrate is cooled to obtain titanium-rich and iron-rich solid slag and liquid with concentrated sulfuric acid as the main component The liquid phase is neutralized with milk of lime for harmless disposal, and can also replace concentrated sulfuric acid for the preparation of anhydrous hydrogen fluoride or be recycled as a hydrometallurgy medium;

[0074] (2) Add sodium fluoride solid to the evaporative condensate obtained in step ...

Embodiment 3

[0079] This embodiment provides a method for recovering fluorine resources in acidic fluorine-containing wastewater. The acidic fluorine-containing wastewater is fluorine-containing acidic wastewater from a niobium-tantalum hydrometallurgy enterprise, and its main chemical component content is the same as that in Example 1. same.

[0080] In the method, except that the evaporation temperature in step (1) is 80°C, the evaporation vacuum is 60kPa, the molar ratio of the sodium fluoride added in the step (2) to the silicon element in the evaporation condensate is 1.9:1, and the step (3) The temperature of the carbon-alkali decomposition reaction is 110° C., and the reaction time is 0.5 h. The amount of other materials and the preparation method are the same as those in Example 1.

[0081] The recoveries of fluorine and silicon in the acidic fluorine-containing wastewater described in this example were 90.3% and 91.6%, respectively.

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Abstract

The invention provides a method for recycling fluorine resources in acidic fluorine-containing wastewater. The method includes: evaporating the acidic fluorine-containing wastewater to obtain evaporation condensate and evaporation concentrate; adding metal fluoride salt into the evaporation condensate to perform reaction, performing solid-liquid separation to obtain solid filter cake and filtrate,and performing rectification and purification on the filtrate to obtain a hydrofluoric acid solution; allowing the solid filter cake and a metal carbonate solution to have carbon-alkali decompositionreaction to obtain slurry containing metal fluoride salt and slurry containing silica colloid, and performing solid-liquid separation to obtain filter cake containing the metal fluoride salt and filter cake containing the silica colloid; allowing part of dried filter cake containing the metal fluoride salt to have reaction with sulfuric acid to obtain anhydrous hydrogen fluoride; drying the filter cake containing the silica colloid to obtain white carbon black. The method has the advantages that the resources such as fluorine and silicon can be efficiently recycled from the fluorine-containing wastewater, the treatment cost of the fluorine-containing wastewater is lowered greatly, and the treatment process of the fluorine-containing wastewater is simplified.

Description

technical field [0001] The invention belongs to the field of recovery of inorganic fluorine resources, and relates to a method for recovering fluorine resources in acidic fluorine-containing wastewater, in particular to a method for recovering fluorine resources from acidic fluorine-containing wastewater in niobium-tantalum hydrometallurgy industry and / or phosphate fertilizer industry . Background technique [0002] Fluorine chemical products are known as the gold industry because of their variety, excellent performance, wide application fields and high added value. On the one hand, fluorspar, also known as fluorspar, has become a national strategic resource and has the characteristics of co-existence and few rich ores. However, most of fluorspar is difficult to process ore, and the resource consumption is fast, so the degree of protection is seriously insufficient; on the other hand, the water environment The potential harm of fluorine pollution is large and the waste of f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/12C01B7/19C02F1/04C02F101/14
CPCC01B7/191C01B7/196C01B33/126C02F1/04C02F2101/14
Inventor 曹绍涛张毅陈芳芳曹宏斌
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI