8 results about "Nitratine" patented technology

The invention relates to the technical field of element detection, in particular to a method for measuring the manganese content in copper concentrate, which comprises the following steps: weighing a copper concentrate sample with the mass of m in a tetrafluoroethylene beaker, and adding a small amount of water to soak the sample; adding nitric acid and hydrochloric acid, and heating at 200-300 DEG C for 5-10 minutes; then adding perchloric acid and hydrofluoric acid, heating at 200-300 DEG C until the copper concentrate sample is completely dissolved, and cooling to room temperature; adding dilute nitric acid, and heating to dissolve the separated salt crystals to obtain a to-be-detected pre-solution; transferring the to-be-detected pre-solution to a volumetric flask, adding water to dilute the pre-solution to a scale line, and uniformly shaking to obtain a to-be-detected solution; according to the method, a nitric acid-hydrochloric acid-perchloric acid-hydrofluoric acid mixed acid digestion system is adopted, so that the manganese element in the copper concentrate is completely dissolved, and the interference of a complex matrix on manganese determination is effectively solved; by combining the high sensitivity and multi-element analysis capability of the inductively coupled plasma emission spectrometer, a linear standard curve of a manganese element characteristic spectral line and concentration is established, and the accuracy and precision of quantitative analysis are remarkably improved.

The invention discloses a perovskite cathode material and a preparation method and application thereof, the general chemical formula of the material is La < 1.2 > Sr < 0.8 > Ni < 0.5 > Cu < x > Fe < 0.5-x > O < 4 + delta > (x = 0.2, 0.3, 0.4), and the material has an R-P perovskite structure of an I4 / mmm space group. The preparation method adopts a sol-gel method, takes nitrate as a raw material, and is prepared by chelating, gelatinizing, drying and calcining at 850 DEG C. The performance of the material is optimal when x is equal to 0.4, the electronic conductivity of the material at the temperature of 400 DEG C reaches 117Scm <-1 >, and the area specific resistance ASR in humid air at the temperature of 650 DEG C is 0.251 ohm cm. According to the invention, Fe and Cu are co-doped at a B site, and a series of materials of La < 1.2 > Sr < 0.8 > Ni < 0.5 > Cu < x > Fe < 0.5-x > O < 4 + delta > (x = 0.2, 0.3, 0.4) are designed and prepared, so that the conductivity and the catalytic activity of the materials are synchronously improved, and the requirements of PCFC cathodes are met.

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.

The application relates to a preparation method of an anisotropic ten-faced nickel-manganese-neodymium ferrite wave-absorbing material and application thereof, and belongs to the technical field of wave-absorbing materials. The method solves the problem that the existing ferrite has a relatively thick matching thickness when absorbing low-frequency electromagnetic waves. The method comprises the following steps: adding magnetic particles into a nickel-manganese-neodymium ferrite-containing nitrate aqueous solution and uniformly mixing, adding citric acid, and adjusting the PH value to obtain a mixed solution; the mixed solution is vacuum dried after heating, and then is heated, ground, high-temperature calcined and ground to obtain the anisotropic ten-faced nickel-manganese-neodymium ferrite wave-absorbing material. The anisotropic ten-faced nickel-manganese-neodymium ferrite wave-absorbing material prepared by the method has a ten-faced crystal structure and multiple crystal structures, has excellent anisotropy, generates high magnetic loss, is beneficial to widening the effective absorption bandwidth of the material under a thinner matching thickness, realizes the lightness of the material, the process has the effect of enhancing the magnetic loss of the material, the method is simple, raw materials are rich in sources, and is suitable for the preparation of most low-frequency wave-absorbing materials.