PROCESSING OF WASTE OF PHOSPHATIC PRODUCTION WITH USE OF LIQUID METALS

Authors & Affiliations

Orlova E.A., Alekseev V.V., Sorokin A.P., Zhmurin V.G., Zagrebaev S.A., Zasorin I.I.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia

Orlova E.A. - Leading Researcher, Cand. Sci. (Tech.), Associate Professor, A.I. Leypunsky Institute for Physics and Power Engineering. Contacts: 1, sq. Bondarenko, Obninsk, Kaluga reg., Russia, 249033, Tel.: (484) 399-42-34, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Alexeev V.V. – Chief Researcher, Doc. Sci. (Tech.), A.I. Leypunsky Institute for Physics and Power Engineering.
Sorokin A.P. – Deputy Director, Academician of Engineering Academy, Doc. Sci. (Tech.), A.I. Leypunsky Institute for Physics and Power Engineering.
Zmurin V.G. – Leading Enginear, A.I. Leypunsky Institute for Physics and Power Engineering.
Zagrebaev S.A. – Researcher, A.I. Leypunsky Institute for Physics and Power Engineering.
Zasorin I.I. – Leading Enginear, A.I. Leypunsky Institute for Physics and Power Engineering.

Abstract

By production of phosphates waste of the type H₂SiF₆, Na₂SiF₆ and others is formed of a ftorapatit, polluting environment. Production of phosphatic fertilizers is developed on JSC Gomel Chemical Plant in Belarus and a number of plants in Russia.

On liquid metall technology of coolents of the nuclear power developed in SSC Russian Federation-IPPE waste of phosphatic production (Na₂SiF₆) are processed in the high-pure silicon besieged on substrates in polycrystalline and amorphous modifications, gaseous SiF₄, NaF used in medical, etc. the purposes and a sheeting on the steels (MgF₂).

High-pure silicon is demanded in the world market in connection with development of electronics and solar power, its price grows.

Possibility of dissolution of silicon from Na₂SiF₆ which is in the mesh container and sedimentation of crystal silicon on a substrate with accumulation of NaF in the container is proved. Use of steel mesh containers allows to intensify silicon restoration process. The device allowing to establish a silicon stream density maximum by a container cell choice is patented.

Increases of pressure in system at interaction of Na₂SiF₆ with Na didn't observe that testifies to lack of gaseous products of reaction. Observed the pressure decrease connected probably with decrease in temperature and endothermicity of reaction that proves ecological purity of process.

For small (some grams) and big (4,75 kg) quantities of Na₂SiF₆ dependence of speed of its restoration on the size of a cell of a grid of the container coincides that allows to predict results of researches on the quantity of a Na₂SiF₆ of sodium sufficient for receiving 10 kg and more silicon per day.

Keywords
waste, siliconfluoride of sodium, high-pure silicon, silicon tetrafluoride, magnesium fluoride, liquid metal

Article Text (PDF, in Russian)

References

UDC 621.039.534

Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2016, issue 5, 5:19