Magnetite powder for kerosene-based ferrofluid was synthesize by air oxidation of waste acid containing Fe^2^+ and Fe^3^+ ions in the ph=11 at 60℃. stable kerosen-based ferrofluid was prepared by addition of polyoxyethylene nonyphencyl ether(POENPE)...
Magnetite powder for kerosene-based ferrofluid was synthesize by air oxidation of waste acid containing Fe^2^+ and Fe^3^+ ions in the ph=11 at 60℃. stable kerosen-based ferrofluid was prepared by addition of polyoxyethylene nonyphencyl ether(POENPE) to the magnetite was examined by means of the fractionof solid dispersed FT-IR spectrum of an addition POENPE to the magnetite was examined by means of the fraction of solid dispersed FT-IR spectrum. And magnetic properties of kerosen-based ferrofluid were examined by method of Vibrating Sample Magnetometer. In order to oil on the water surface by an addition of kerosen-based ferrofluid, the optimum conditions were examined.