The defluorination agent produced by FORTUNE Environmental Protection is a high-molecular-weight reagent that can effectively remove fluoride ions from zinc sulfate solution. It is a white solid and has good regeneration ability during use, allowing for multiple cycles of use.


Fluoride removal process: The fluoride-containing solution before the fluoride removal has a fluoride content of 150-700mg/L and a pH value of 4-5. The dosage of fluoride removal agent is 10-30 times the fluoride content. The reaction temperature is 55-65°C. After the reaction, the filtrate is filtered and sent for testing.
On-site use of fluoride removal agent: According to the specific process flow of the customer, the fluoride removal tank may be located in different places, usually in the purification section or before purification. The fluoride content of the solution before testing is checked, and the pH value is adjusted if necessary. The appropriate amount of fluoride removal agent is weighed and added to the fluoride removal tank. After the fluoride removal reaction is completed, the hot filtrate is filtered and washed with a filter press, and the filtrate enters the next process, while the fluoride removal residue is stored in a pile.

ADVANTAGES:

1.Our FAF series agents will not affect the water body, will not increase COD, N, P and other pollutants in the water body, and can realize the defluorination process without discharging waste water.

2.Only one reaction precipitation, high defluorination efficiency, fast defluorination speed, stirring reaction 45 ~ 60min can complete the reaction, fluorine removal rate can reach 95% or more.

3.In addition to the solid waste precipitated by the reaction with fluorine, there are no other solids. The amount of slag produced in the process of fluorine removal is small, and it will not lead to the entrainment loss of valuable elements. The slag rate is low, so that the filter press discharge slag frequency is greatly reduced, reduce the labor intensity of workers, slag can be completed after pickling, but also purify the working environment

4.The defluorination process is simple, also simple to use and operate. No need to adjust pH value, high purification depth of the system, good quality of new liquid, high qualified rate, system stability; There is no fluorine cadmium reverse dissolution, so that the production of high moving rate, reagent reaction is faster, normally 45 ~ 60min, in traditional defluorination requires at least 90 ~ 120min.

5.The requirement range of fluorine content in the pre-solution to defluorination is very wide, and the adaptability is strong, which plays a positive role in the procurement range of mineral raw materials, and the consumption of zinc powder in the purification and defluorination of the metallurgical process is greatly reduced, and the dependence on zinc powder in production is reduced

A zinc smelting plant in Northeast China has a pre-treatment solution with a pH of around 5.0 and a fluoride concentration of 150mg/L to 200mg/L at a temperature of 50-70℃, which needs to be de-fluorinated to below 50mg/L. The pre-treatment solution has characteristics such as high salt content, high heavy metal content, strong buffering capacity, and difficult treatment. The purification process uses the latest developed activator and de-fluorination agent in combination by our company.
The purification process is as follows: Zinc smelting pre-treatment solution → add 0.05% activator and react for 10 minutes → add de-fluorination agent with a fluoride content of 15-20 times → stir and react for 60 minutes → settle and filter → post-de-fluorination solution.

The results show that the de-fluorination agent with the activator has significantly improved de-fluorination effect compared to not adding an activator, reducing the total amount of de-fluorination agent by 17%, and reducing the total cost of de-fluorination by about 15%.

Concentration of Fluoride in Liquid Before Treatment.(mg/L)	Pre-treatment liquid pH value	emission standard(mg/L)	pH value of the liquid aftertreatmentpH
150-200	5.0	＜50	5.0

Significant defluorination effect
Simple process
Low zinc loss