Water treatment for industries using fluorine is a serious issue
Porous Alpha can reduce the cost of fluorine water treatment.
Our technology “Fluorine adsorption agent and fluorine-containing water treatment” is patented
Various industries use and discharge fluoric fluid
- Semiconductor manufacturer uses fluoric fluid to clean silicon wafers
- The glass manufacturers and processors use the fluoric fluid as material for etching
- Liquid crystal display manufacturer use fluoric fluid for etching glass
- Metal processing company use fluoric fluid for pickling
- Coal thermal power plant discharge waters with fluorine from the desulfurization system
Water treatment is a serious issue
Regulation of discharge of fluorine (8 mg/l) must be followed
The existing solution requires a lot of costs
- A large quantity of sludge, which is an industrial waste, is generated
- Resin solution, discharging a small amount of waste, is expensive
The hydrothermally-processed Porous Alpha has increased specific surface area which adsorbs fluorine
| Before Hydrothermal process | After Hydrothermal process |
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| Specific surface area：83m2 g-1 | Specific surface area: 278m2 g-1 |
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Fluorine is removed from its solution as a result of precipitation of fluorine ion as sodium fluorosilicate |
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| Sodium fluorosilicate is valuable as a law material for hydrofluoric acid |
Process flow of fluorine water treatment with Porous Alpha
Fluorine adsorption and desorption process could be implemented in a simple manner with Porous Alpha
Porous Alpha’s capacity of adsorption of fluorine is drastically higher than other agents
Adsorption capacity and contact time for a different agent for adsorption of fluorine
Fluoric water treatment with Porous Alpha has a wider range of use and/or is more cost-effective than others
In addition to the above, a simple plant structure can realize the small size of the initial investment
Our solution for fluoric water treatment is under verification in liquid crystal manufacturer
Customer: Manufacturer of liquid crystal related product
Concentration of fluorine before treatment: Hundreds of thousand ppm
Currently, they’re using the combination of precipitation method with calcium and aluminum to remove fluorine. They have the intention to use our technology to reduce the discharging cost of industrial waste (sludge)
Specification and applied conditions for fluorine adsorption and desorption by Porous Alpha
- Minimum contact time: 1hour
- Fluorine adsorption capacity per 1g of Porous Alpha: 400mg
- In case of a high concentration of fluorine, the adsorption process should be repeated
- The required quantity of Porous Alpha per 1 step: 5% of the quantity of fluid
- The concentration of fluorine after adsorption process: less than 8ppm
- Not guaranteed to decrease the concentration to 0.8 ppm (for potable water)
- The purity of precipitation on sodium fluorosilicate is decreased according to the concentration of Fe (III) and Al(III)
- Technical issues to be solved
- The fluoric water discharged from glass etching contains boron. As a water treatment solution, the removal of BF4 is also required. Now we are developing to remove the boron alongside with fluorine.
- To provide as a system for water treatment of fluoric discharging water, it is required to remove boron at the same time
- Methodology to remove boron is now under investigation.