Waste-gypsum of iron works was milled with CaO by planetary mill. TGA analysis of the ground material showed that the characteristics of pyrolysis after mechanical grinding was increased from 90% to 94% at 800℃. From the analysis of XRF the constituent of Na2O, SO3, Cl, PbO and ZnO were decreased while that of MgO, Al2O3, SiO2 and CaO increased a little. XRD analysis showed that high peak swere shown at PbO, PbCl2, PbO2 and Pb2O3 before mechanical treatment. After mechanical grinding of D-2, high peaks were shown at Pb3O4 and Pb5O8 showing the oxidation of Pb. These results showed that mechanochemical grinding in plnetarymill promoted to change chemical properties of waste gypsum of ironworks to oxydize the Pb component of waste gypsum of ironworks.

Houttuynia cordata is used as a raw material of oriental medicine to acquire antioxidant and anti cancer effect and to cure a heart disease. Mechanochemical technology not only reduces the size of the object but also changes the chemical properties of the object. Extraction of functional materials from the Houttuynia cordata after grinding as a pretreatment using the mechanochemical technology was conducted in this study to investigate the effect of grinding on the yields and antioxidant activities of the extract. Houttuynia cordata was ground by the planetary ball mill and the morphology was analyzed by SEM. Yields of functional materials were increased from 6.2 g in the sample without grinding to 7.0, 7.8, 8.8 g after grinding of 30 minutes, 1 hour and 2 hours, respectively. Nitrite scavenging abilities were increased from 57-77% to 69-86% as a result of mechanochemical pretreatment. Also, DPPH scavenging abilities for the methanol extraction were increased from 10.01-40.29% to 11.01-49.29% as a result of mechanochemical grinding.