13 results about "Sodalite" patented technology

This invention provides a method for synthesizing sodalite from 4A zeolite and simultaneously solidifying radioactive waste salts in situ, belonging to the field of radioactive waste salt solidification treatment technology in the dry reprocessing of spent fuel. The invention involves mixing 4A zeolite powder, radioactive waste salts, alkali metal chloride salts, and a dispersant at a specific liquid-to-solid ratio, followed by heating and drying to obtain a solidification precursor. The precursor is then ground, sieved, and sintered at temperatures not exceeding 900°C to obtain a solidified sodalite body. The method provided by this invention features low energy consumption, simple operation, low 4A zeolite usage, high radioactive waste salt coating rate, and high radioactive element fixation. The synthesized solidified sodalite body exhibits strong thermal stability and high mechanical hardness, with a normalized leaching rate of less than 5 x 10⁻⁶ after soaking in water at 90°C for 28 days. ‑ 4 g / (cm 2 ·d) The sodalite solidified body of the present invention can be geologically stored for a long time, effectively reducing the risk of migration, diffusion and leakage of radioactive materials.

This invention provides a hierarchical interconnected sodalite molecular sieve particle, its preparation method, and its application, belonging to the field of molecular sieve technology. The preparation method of the hierarchical interconnected sodalite molecular sieve particle provided by this invention includes the following steps: mixing an aluminum source, an alkali source, a silicon source, a first solvent, and a mesoporous template agent to obtain a silica-alumina gel solution; aging and drying the silica-alumina gel solution sequentially to obtain a silica-alumina dry gel; mixing the silica-alumina dry gel, a molding aid, and a second solvent, and kneading to obtain silica-alumina gel particles; and crystallizing and calcining the silica-alumina gel particles sequentially to obtain hierarchical interconnected sodalite molecular sieve particles. This invention uses a dry gel conversion method to synthesize microporous sodalite crystals; introduces a mesoporous template agent using a hard template method, forming mesopores after calcination; and removes the molding aid and mesoporous template agent by calcination to form macropores, thus obtaining hierarchical interconnected sodalite molecular sieve particles, while avoiding the adverse effects of the molding aid.

The invention provides a sodalite molecular sieve particle with through multistage pore channels as well as a preparation method and application thereof, and belongs to the technical field of molecular sieves. The preparation method of the sodalite molecular sieve particles with through multistage pore channels comprises the following steps: mixing an aluminum source, an alkali source, a silicon source, a first solvent and a mesoporous template agent to obtain a silica-alumina gel solution; sequentially aging and drying the silica-alumina gel solution to obtain silica-alumina dry gel; mixing the silica-alumina dry glue, a molding auxiliary agent and a second solvent, and performing kneading molding to obtain silica-alumina gel particles; and sequentially crystallizing and calcining the silica-alumina gel particles to obtain the sodalite molecular sieve particles with through multistage pore channels. The microporous sodalite crystal is synthesized by adopting a dry glue conversion method; introducing a mesoporous template agent by adopting a hard template method, and calcining to form mesopores; the molding aid and the mesoporous template agent are removed through calcination to form macropores, so that the sodalite molecular sieve particles with through multistage pore channels are obtained, and meanwhile, the adverse effect of the molding aid is avoided.

The invention discloses a method for synthesizing sodalite by taking kaolin as a raw material in a specific atmosphere through step-by-step heat treatment and application of the sodalite. The method comprises the following steps: mixing kaolin with an alkali activator, a structure-directing agent (such as chloride or sulfate) and a water-containing medium to form slurry; then in the atmosphere containing inert gas, water vapor, oxygen and optional reducing gas, pretreatment is conducted for a certain time at the low temperature (such as 80-250 DEG C), then the temperature is increased to 700-750 DEG C at the temperature increasing rate of 10-25 DEG C / min, and a reaction is conducted to generate sodalite crystals. The prepared sodalite is high in purity (greater than 85%), can be used as a stable curing carrier, effectively contains radionuclides such as Cs < + > and Sr < 2 + > through ion exchange and lattice curing, and has good curing performance.

The application discloses a method for synthesizing sodalite by a hydrothermal method and solidifying and stabilizing harmful metal elements and application thereof, and belongs to the technical field of solidification treatment of hazardous waste. In the method, raw materials for synthesizing the sodalite, such as silicon dioxide, are pretreated by ball milling, and then the sodalite solidification body is rapidly synthesized by hydrothermal synthesis at a low temperature for a certain time, and radioactive harmful substances, such as radioactive waste salt in the nuclear industry, are simultaneously solidified in the process. The sodalite synthesized under the optimized conditions can also be used as an adsorbent to be extended to environmental media such as aqueous solution and liquid salt and be used for adsorbing radioactive or other common heavy metal harmful elements. The method has the advantages of fast reaction rate, high immobilization rate, strong stability, low cost and environmental friendliness and the like, and has important application value in the field of treatment and disposal of radioactive waste salt and other hazardous waste.

The application discloses a green preparation method of high-performance shaped sodalite and application. Natural minerals, solid alkali and water are uniformly mixed to obtain a mixture; the mixture is extruded by using an extruder to obtain a shaped mixture; and then the shaped mixture is crystallized, filtered and washed to obtain high-performance shaped sodalite. The shaped sodalite prepared by the green preparation method has the characteristics of high mechanical strength, high water absorption and high maximum adsorption capacity of metal ions, can be used for adsorbing water and adsorbing metal ions, and is a material with excellent performance.

This invention describes methods of alkylating isobutane which include a catalytic reaction system comprising a crystalline zeolite catalyst and a rare earth-modified molecular sieve adsorbent (RE-MSA). The crystalline zeolite catalyst comprises sodalite cages and supercages, a Si / Al molar ratio of 20 or less, less than 0.5 weight percent alkali metals; and up to 5 wt % of Pt, Pd and or Ni, and acid-site density (including both Lewis and Brønsted acid sites) of at least 100 μmole / gm. The RE-modified molecular sieve adsorbent (Re-MSA) comprising sodalite cages and supercages, a Si / Al molar ratio of 20 or less, less than 1 wt % of alkali metals, RE (rare earth elements) in the range of 10 to 30 wt % and transition metals selected from groups 9-11 in the range from 2 wt % to 10 wt; and acid-site density of no more than 30 μmole / gm. The invention also includes methods of making RE-MSA.

The application discloses a method for synthesizing sodalite zeolite molecular sieve by taking granite weathered residual soil as raw material, and relates to the technical fields of solid waste resource utilization and inorganic functional material. The method for synthesizing sodalite zeolite molecular sieve by taking granite weathered residual soil as raw material comprises the following steps: purifying the granite weathered residual soil to obtain clay powder; performing ball milling treatment on the clay powder to obtain mechanically activated material; mixing the mechanically activated material with sodium hydroxide solution, and then performing reaction at 50-80 DEG C for 6-24h to obtain reaction synthesis; and sequentially washing and drying the reaction synthesis to obtain the sodalite zeolite molecular sieve. The application can realize the purpose of resource utilization of the granite weathered residual soil, and the synthesis method has the advantages of low reaction temperature, simple synthesis process and normal pressure, and solves the problems of high energy consumption and complicated process of the traditional method for preparing the sodalite zeolite molecular sieve.

The application discloses a method for preparing sodalite type zeolite molecular sieve by using fly ash and a product thereof, and the method comprises the following steps: mixing dry and ground fly ash and sodium hydroxide according to a mass ratio of 1:0.8-1.0, then transferring the mixture into a reaction kettle with tetrafluoroethylene lining, placing the reaction kettle in an oven, and performing hot-pressing reaction at 160-180 DEG C and 1.2-1.5 MPa for 9-18 h, after the reaction is completed, washing the product with distilled water until the washing liquid is neutral, filtering and drying the filter residue, and then the sodalite type zeolite molecular sieve is obtained. The application provides a method for efficiently and low-energy-consumption grinding-hot-pressing-washing synthesis of sodalite type zeolite molecular sieve, and the obtained sodalite has high purity, good crystallinity and uniform morphology. The application provides a new way for resource utilization of fly ash and synthesis of zeolite, and has remarkable economic and environmental benefits.

The invention relates to the field of hollow ZIF-8 nanospheres, in particular to a hollow ZIF-8 nanosphere and a preparation method thereof. The hollow ZIF-8 nanosphere is of a sodalite structure, the specific surface area of the hollow ZIF-8 nanosphere is not smaller than 1300m < 2 > / g, and the pore volume of the hollow ZIF-8 nanosphere is not smaller than 0.75 cm < 3 > / g. The sodalite structure, the high specific surface area and the pore volume of the hollow ZIF-8 nanosphere are limited, the structural stability is maintained through a rigid framework of a sodalite topological structure, the large specific surface area provides rich gas adsorption sites, and the molecular diffusion efficiency and the storage capacity are improved through cooperation of a hollow cavity and the pore volume. By means of the hierarchical structure of the cavities and the micropores, efficient capture and separation of gas molecules such as CO2 are achieved, meanwhile, it is guaranteed that the material is not prone to collapse in the cyclic adsorption / desorption process through a rigid framework, and the material is suitable for a long-term stable operation gas separation scene.

The application discloses a preparation method of lanthanum modified Y molecular sieve with high catalytic activity and application of the lanthanum modified Y molecular sieve. The preparation method of the lanthanum modified Y molecular sieve is as follows: S1, dispersing NH4Y molecular sieve in a lanthanum salt solution, stirring at 60-100 DEG C for 2-12 hours, filtering, and drying to obtain a solid powder; S2, filling the solid powder into a quartz tube with air inlet at both ends, then heating one side of the quartz tube and introducing dry flow gas, heating the quartz tube to 400-800 DEG C, then keeping the reaction at 400-800 DEG C and under the flow gas for 2-24 hours, after the reaction is completed, continuously introducing the dry flow gas and naturally cooling to obtain the lanthanum modified Y molecular sieve with high catalytic activity. The preparation method of the lanthanum modified Y molecular sieve is simple and easy to operate, more importantly, the method can effectively inhibit the migration of lanthanum element from the supercage to the sodalite cage, and the catalytic cracking activity is obtained, and the method has a wide application prospect in the petroleum fluid catalytic cracking reaction.

The invention discloses a method for synthesizing sodalite through a hydrothermal method and solidifying and stabilizing harmful metal nuclides and application, and belongs to the technical field of solidification treatment of hazardous wastes. According to the method, silicon dioxide and other raw materials for synthesizing sodalite are subjected to ball milling pretreatment and then subjected to heat preservation for a certain time at the low temperature, sodalite solidified bodies are rapidly subjected to hydro-thermal synthesis, and radioactive harmful substances such as nuclear industry radioactive waste salt are synchronously solidified in the process; the sodalite synthesized under optimized conditions can also be used as an adsorbent to be expanded and applied to environmental media such as aqueous solutions and liquid salts, and is used for adsorbing radioactive or other common heavy metal harmful elements. The method has the advantages of high reaction rate, high immobilization rate, strong stability, low cost, environmental friendliness and the like, and has important application value in the field of treatment and disposal of hazardous wastes such as radioactive waste salt and the like.

The invention discloses a method for synthesizing sodalite from kaolinite and solidifying radioactive waste salt in situ and application of the method, the method comprises the following steps: mixing kaolinite, inorganic alkali, molten salt and chlorine-containing radioactive waste salt, and then carrying out heat treatment, at least one of the inorganic alkali and the molten salt containing Na element; a mixture of kaolinite, inorganic alkali, molten salt and chlorine-containing radioactive waste salt is converted and synthesized into sodalite, and in-situ capture of splitting elements and chlorine elements is achieved. According to the method, the natural clay mineral kaolinite which is rich in natural reserves, stable in chemical property and rich in silicon and aluminum sources is used as a raw material, sodalite is synthesized in a molten salt system, radioactive waste salt is solidified synchronously, and the high-temperature molten salt electrolytic refining and electrolytic reduction processes can be better linked in the process. According to the method, efficient capturing and fixing of various splitting elements and chlorine elements in the radioactive waste salt can be achieved, the stability and safety of a solidified body are improved, the treatment cost and energy consumption are reduced, and the treatment process is simplified.