It is possible to insolubilize fluorine in gypsum.
Fluorine in gypsum is more difficult to immobilize than fluorine in soil, but by using supermagnetite, it can be immobilized below environmental standards.
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basic information
Regarding the Insolubilization of Fluorine in Gypsum Our company has been conducting research on the solidification of dihydrate gypsum and hemihydrate gypsum, as well as the insolubilization of fluorine, through the Gypsum Board Recycling Research Association for a long time. We have performed various leaching tests of fluorine using different insolubilization agents, but none have met environmental standards. In particular, dihydrate gypsum tends to be more difficult to insolubilize than hemihydrate gypsum. By adding a small amount of the powdery fluorine insolubilization agent Super Magnecloze to dihydrate gypsum and stirring for just 5 minutes, we achieved results in the fluorine leaching test that were well below environmental standards. Example of Fluorine Insolubilization When 5% Super Magnecloze was added and stirred into crushed and separated dihydrate gypsum, the fluorine leaching amount of 6.9 mg/L from the dihydrate gypsum was reduced to 0.45 mg/L after insolubilization treatment, thus meeting environmental standards.
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Applications/Examples of results
FSC Method Examples of Using Hemihydrate Gypsum When 4% Super Magnecloze is added to hemihydrate gypsum and stirred, fluoride can be reduced to below environmental standards; however, due to the influence of Super Magnecloze, the pH becomes weakly alkaline. Since hemihydrate gypsum is neutral, if it is to be used as a neutral solidifying agent, a pH adjusting agent called Control Soil is necessary to bring the pH to neutral. Using a mixture of 4% Super Magnecloze and 20% Control Soil added to red soil with a pH of 7.7, we measured the elapsed time for stirring 150 kg/m3 for up to three days. The measurement method was JGS0211-2000. The pH immediately after treatment was 9.2, after one day it was 8.8, after two days it was 8.4, and after three days it became neutral at 7.8. The effectiveness of Control Soil was confirmed.
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Company information
Our company is small, but we have applied for patents for electric dust collectors and sludge solidification treatment devices. Currently, we are providing environmental purification technology consulting based on cutting-edge environmental purification technology, as well as developing and planning environmental purification devices. We have developed and are selling environmental purification products such as the dioxin removal coagulant Ultra Separate SDS, the heavy metal removal coagulant Ultra Separate S300, and the turbidity coagulant Ultra Separate MC, which is effective for a wide range of applications from organic wastewater to the purification of lake water quality. We are also currently selling a dihydrate gypsum semi-hydration device that can convert waste gypsum boards after crushing and separation into recyclable raw materials. We are developing solidifying agents for soil conditioners, high-moisture sludge, and sludge containing heavy metals, utilizing the semi-hydrated gypsum produced from the dihydrate gypsum semi-hydration device, and we plan to sell these as well. We intend to continue developing products and goods based on environmental purification technology in the future.