Korea Institute of Geoscience and Mineral Resources

Other

Myung Eun Ju

Dae Sup Kil

Yong Jae Suh

Hee Dong Jang

Sung Wook Cho

The present invention provides a method for removing phosphorus and nitrogen contained in sewage or wastewater using iron ore wastewater. According to the method of the present invention, in which the phosphorus and nitrogen contained in sewage or wastewater are crystallized in the form of struvite using iron ore wastewater containing a large amount of Mgproduced in a process of upgrading low-grade iron ore and removed, it is possible to reduce the cost of Mgand the cost of iron ore wastewater treatment, thereby earning economic profits. Moreover, it is possible to prevent water pollution by the removal of the phosphorus and nitrogen contained in sewage or wastewater. Furthermore, it is possible to use struvite crystals obtained as a by-product as a time-release compound fertilizer so as to reduce the amount of fertilizer used and the number of fertilizations, thereby reducing soil contamination.

Method for removing phosphorus and nitrogen contained in sewage or wastewater using iron ore wastewater

The present invention provides a hybrid powder of halloysite nanotubes and light-scattering nanoparticles, a method for preparing the same, and a UV-screening cosmetic composition containing the same as an active ingredient. The hybrid powder of halloysite nanotubes and light-scattering nanoparticles according to the present invention, in which the light-scattering nanoparticles are loaded into the halloysite nanotubes, can prevent the light-scattering nanoparticles from penetrating the skin, which minimizes side effects, and has excellent UV-screening effect. Thus, the hybrid powder of halloysite nanotubes and light-scattering nanoparticles according to the present invention can be effectively used as a UV-screening cosmetic composition.

Hybrid powder of halloysite nanotube and light-scattering nanoparticle, method for preparing the same, and UV-screening cosmetic composition containing the same as active ingredient

The present invention provides a method for preparing magnetite nanoparticles from low-grade iron ore and magnetite nanoparticles prepared by the same. According to the method of the present invention, in which iron ore leachate is obtained by adding low-grade iron ore powder to an acidic solution, Si and Mg that inhibit the formation of magnetite nanoparticles present in the leachate are selectively removed, iron hydroxide (Fe(OH)) is allowed to be precipitated from a supernatant containing Feions and Feions, a mixed iron solution containing Feions and Feions is prepared using the iron hydroxide (Fe(OH)), and the mixed iron solution is added to an alkaline solution to react, thereby preparing magnetite nanoparticles.

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Daejeon, South Korea

Myung Eun Ju