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Method for removing fluorine in liquid after tungsten ion exchange

An ion exchange and fluoride ion technology, which is applied in the field of removing fluorine in the liquid after tungsten ion exchange, can solve the problems such as the inability to achieve the fluorine removal effect, and achieve the effect of high stability and simple process flow.

Active Publication Date: 2017-03-29
CHONGYI ZHANGYUAN TUNGSTEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing purification methods, including ion exchange methods, cannot achieve such a high-required defluorination effect.

Method used

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  • Method for removing fluorine in liquid after tungsten ion exchange
  • Method for removing fluorine in liquid after tungsten ion exchange
  • Method for removing fluorine in liquid after tungsten ion exchange

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Take 500ml of tungsten ion-exchanged liquid with a fluorine concentration of 42.6mg / L, divide it into four groups A, B, C, and D, and then add CaCl according to the reagent dosage shown in Table 1 2 And mix and stir for 10min, the stirring speed is 100r / min, then add Fe 2 (SO 4 ) 3 , stirred at room temperature for 10min at a stirring speed of 100r / min, and finally added Ca(OH) 2 Precipitate and adjust the pH, the stirring speed is 100r / min, the stirring time is 5min, and then add 0.5ml of polyacrylamide flocculant.

[0053] Table 1 Reagent dosage and fluorine concentration

[0054]

Embodiment 2

[0056] Take 500ml of tungsten ion-exchanged solution with a fluorine concentration of 42.6mg / L, divide it into four groups E, F, G, and H, and then add CaCl respectively according to the reagent dosage shown in Table 2 2 And mix and stir for 10min, the stirring speed is 300r / min, then add Fe 2 (SO 4 ) 3 , stirred at room temperature for 10min at a stirring speed of 300r / min, and finally added Ca(OH) 2 Precipitate and adjust the pH, the stirring speed is 300r / min, the stirring time is 10min, and then add 0.5ml of polyacrylamide flocculant.

[0057] Table 2 Reagent dosage and fluorine concentration

[0058]

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Abstract

The invention discloses a method for removing fluorine in liquid after tungsten ion exchange. The method comprises the following steps: (1) mixing the liquid after tungsten ion exchange with a calcium chloride liquid to obtain a first mixed liquid; (2) mixing the first mixed liquid with a ferric sulfate liquid to obtain a second mixed liquid; (3) mixing the second mixed liquid with slaked lime and a flocculating agent to obtain the liquid after fluorine removal. The fluorine ion concentration in the liquid after fluorine removal prepared by use of the method is lower than 10mg / L, and the process flow is simple and high in stability.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, in particular, the invention relates to a method for removing fluorine in liquid after tungsten ion exchange. Background technique [0002] Fluorine is the most active non-metallic element and reacts easily with various elements and chemicals. At the same time, fluorine is also one of the essential trace elements for the human body, which is mainly taken into the body through drinking water, breathing and food. Excessive intake of fluorine will have adverse effects on human health. When the fluoride content of drinking water is greater than 1.0 mg / L, long-term drinking can cause dental fluorosis and skeletal fluorosis. When the fluorine content exceeds 6.0 mg / L, it can cause severe disabling skeletal fluorosis, manifested as bone deformation, general pain, loss of working ability and even paralysis. [0003] Fluoride is a toxicological indicator of water quality and widely exists in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/16C02F101/14
CPCC02F1/56C02F1/66C02F9/00C02F2101/14C02F2103/16
Inventor 何人桂刘宏萱黄泽辉
Owner CHONGYI ZHANGYUAN TUNGSTEN
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