Application background and overview of hydrated samarium carbonate
Hydrated samarium carbonate Sm2(CO3)3·3H2O=534.79, yellow-white crystalline powder. Insoluble in water, soluble in acid and releases carbon dioxide. It is obtained by passing carbon dioxide into the suspended aqueous solution of samarium hydroxide and converting it.
Application preparation of hydrated samarium carbonate
Add 2000LSmCl3 solution with a concentration of 0.45mol/L and ZnCl2 concentration of 0.0614mol/L into the precipitation tank, and then add 321kg solid NH4Cl. After the solid NH4Cl is dissolved, when the temperature of the material liquid reaches 60°C, add a concentration of 1.9mol/L. L ammonium bicarbonate and a mixed solution of NH4Cl with a concentration of 3 mol/L, when the pH value of the precipitation mother liquor reaches 6, the Sm3+ in the solution is completely converted into samarium carbonate precipitate.
Applications of hydrated samarium carbonate
1) Dissolving basic zinc carbonate from the solid mixture of samarium carbonate and basic zinc carbonate belongs to the field of rare earth hydrometallurgy. In the present invention, NH4Cl-containing samarium europium is added to the reaction tank to separate the solid mixture of rare earth saponification residual liquid, samarium carbonate and basic zinc carbonate, then solid NH4Cl is added, and ammonia water is used to prepare a solution with a pH value of 7. When the reaction temperature is 60°C, After a certain period of reaction, basic zinc carbonate dissolves from the solid mixture into the solution, while samarium carbonate does not dissolve. After filtering, washing, and burning, a samarium oxide product with a ZnO content of 0.005% is obtained. This method can reduce production costs and simplify production. process to facilitate industrialization.
2) Molten salt electrolysis of gadolinium carbonate and samarium carbonate to prepare aluminum-gadolinium-samarium master alloy. AlF3-NaCl-KCl is used as the electrolyte system, and a mixture of samarium carbonate and gadolinium carbonate is added to the electrolyte system; inert metal tungsten is used as the cathode, graphite is used as the anode, and the electrolysis temperature is 750~840°C, using the sinking cathode method, with the pole distance is 4cm, the cathode current density is 6.2~10A/cm2, the anode current density is 0.5A/cm2, the cell polycarbonate voltage is 4.5~7.2V, after 2~5 hours of electrolysis, Al is deposited near the cathode in the molten salt electrolytic cell -Gd-Sm alloy. The seed production process of the invention is simple and efficient. Compared with the thermal reduction method: the smelting burning loss is small, the high smelting cost is reduced and the shortcomings of large-scale production are solved. And by adding rare earth elements gadolinium and samarium, the creep properties, mechanical strength, and corrosion resistance of aluminum-gadolinium alloys are changed.
3) Prepare a heat-absorbing, energy-saving and environmentally friendly coating. The heat-absorbing, energy-saving and environmentally friendly coating is made of fillers and film-forming materials. The fillers are mixed with the following parts by weight of raw materials: 20 to 35 parts of silica. , 8 to 20 parts of aluminum oxide, 4 to 10 parts of titanium oxide, 4 to 10 parts of zirconium oxide, 1 to 5 parts of zinc oxide, 1 to 5 parts of magnesium bromide, 0.8 to 5 parts of silicon carbide, 0.02 to 0.5 yttrium oxide parts, 0.01 to 1.5 parts of chromium trioxide, 0.01 to 1.5 parts of kaolin, 0.01 to 1.5 parts of rare earth materials, 0.8 to 5 parts of carbon black, and the particle size of each raw material is 1 to 5 μm; the rare earth materials include 0.01 to 5 μm of samarium carbonate. 1.5 parts, 0.01-1.5 parts of europium sulfate, 0.01-1.5 parts of thulium carbonate, 0.01-1.5 parts of ytterbium carbonate and 0.01-1.5 parts of lutetium carbonate; the film-forming material is sodium potassium carbonate. The invention has the characteristics of firm coating adhesion and obvious energy-saving effect.
4) Prepare an energy-saving and environmentally friendly coating for improving heat absorption efficiency. The energy-saving and environmentally friendly coating is made of fillers and film-forming materials. The fillers are mixed with the following raw materials in parts by weight: Dioxide 20 to 35 parts of silicon, 8 to 20 parts of aluminum oxide, 4 to 10 parts of titanium oxide, 4 to 10 parts of zirconium oxide, 1 to 5 parts of zinc oxide, 1 to 5 parts of magnesium oxide, 0.8 to 5 parts of silicon carbide, yttrium oxide 0.02 to 0.5 parts, 0.01 to 1.5 parts of chromium trioxide, 0.01 to 1.5 parts of kaolin, 0.01 to 1.5 parts of rare earth materials, 0.8 to 5 parts of carbon black, and the particle size of each raw material is 1 to 5 μm; the rare earth materials include carbonic acid 0.01 to 1.5 parts of samarium, 0.01 to 1.5 parts of europium sulfate, 0.01 to 1.5 parts of gadolinium oxide, 0.01 to 1.5 parts of terbium oxide and 0.01 to 1.5 parts of dysprosium oxide. The invention has the characteristics of firm coating adhesion and obvious energy-saving effect.
