4 results about "Nitratine" patented technology

The invention relates to a nano rare earth garnet-based material and a preparation method thereof. The invention relates to a nano rare earth garnet-based material. The chemical formula of the nano rare earth garnet-based material is Y3Al2Ga3O12. The preparation method solves the problem that in the prior art, a pure-phase Y3Al2Ga3O12 nano rare earth garnet-based material cannot be temporarily subjected to hydro-thermal synthesis. According to the preparation method, a simple hydrothermal method is adopted, nitrate is taken as a main material, and the preparation of the pure-phase Y3Al2Ga3O12 nano rare earth garnet-based material is realized by adjusting conditions and parameters such as the pH value, the reaction time and the reaction temperature of a system.

The invention discloses a method for inducing superconducting-insulator phase change of two-dimensional Mo2C through doping of rare earth elements. The method comprises the following steps: 1, weighing Mo2C powder and nitrate hydrate containing the rare earth elements in a glove box protected by inert atmosphere; 2, putting Mo2C powder and nitrate hydrate containing rare earth elements into a polytetrafluoroethylene lining of a hydrothermal reaction kettle, and adding deionized water to form a mixed solution; 3, sealing and then carrying out hydrothermal reaction; and 4, separating the reaction product, and carrying out washing and vacuum drying to obtain the rare earth element doped Mo2C material. A hydrothermal synthesis method is adopted, rare earth elements uniformly enter Mo2C crystal lattices in an atomic scale through in-situ ion exchange and doping in the hydrothermal reaction process, the Mo2C material uniformly doped with the rare earth elements is prepared, phase change of the Mo2C material from a superconductor to an insulator is achieved, operation is easy, conditions are mild, and cost is low.

This invention provides a grinding and flotation separation method for silicate minerals. The method includes: grinding a mixture containing silicate minerals, nitrite, and a solvent using grinding media to induce a redox reaction during grinding, resulting in a slurry; and performing flotation separation on the slurry to obtain a concentrate and tailings; wherein at least one of the silicate minerals and the grinding media contains iron, and the iron is primarily Fe2+ or Fe3+. 2+ and Fe 3+ The slurry contains one or more of the following forms: the solid matter includes mineral particles and Fe3O4, and at least some of the mineral particles are coated with an H2SiO3 layer. Compared with the traditional "grinding + flotation separation" method, the method provided in this application can improve the separation efficiency and recovery rate of various metal elements and silicate products in silicate minerals.

The invention relates to the technical field of radioactive waste solidification treatment, and provides a method for controlling ruthenium oxide (RuO2) precipitate morphology in a high-level liquid waste glass solidification process, and the method comprises the following steps: S1, mixing glass raw materials, heating and melting, cooling, and crushing to prepare 1-2 mm basic glass particles; s2, a nitrate reagent is dissolved in nitric acid, simulated high-level radioactive waste liquid with the nitric acid concentration being 1-8 mol / L is prepared, and dried simulated high-level radioactive waste is obtained after evaporation drying; s3, mixing the basic glass with the dried simulated high-level radioactive waste, heating and melting, and cooling to obtain a glass solidified body sample. The RuO2 morphology control is realized by regulating and simulating the concentration of nitric acid in the high-level liquid waste: in the step S2, when the concentration of the nitric acid is 1-3 mol / L, short rod-shaped and granular RuO2 crystals are mainly separated out from a solidified body; and when the concentration of the nitric acid is 3-8 mol / L, forming a long needle-shaped RuO2 crystal. In addition, the simulated high-level radioactive waste which is dried by distillation is calcined at 650-850 DEG C, so that more granular RuO2 crystals can be obtained or needle-shaped RuO2 can be converted into particles.