6results about How to "Lower decomposition temperature" patented technology

The invention relates to the technical field of silicon carbide ceramics, in particular to an in-situ induced low-temperature eutectic silicon carbide porous ceramic and a preparation method thereof. The material is prepared by mixing and sintering the following materials: silicon carbide, a synergistic sintering system, a dispersing agent, a plasticizer and water, wherein the synergistic sintering system comprises the following components: pregelatinized starch, a silicate mineral material, aluminum oxide, calcium carbonate, glass powder and rare earth oxide; the pregelatinized starch is adopted as an adhesive, the thermal decomposition behavior of the pregelatinized starch and the chemical reaction activity of the glass powder and the calcium carbonate form synergy in the process, seamless connection of the whole process from the room temperature to the sintering temperature is achieved, the sintering temperature is greatly reduced, meanwhile, the glue discharging step is omitted, and the silicon carbide porous ceramic product with good performance and few defects is obtained.

The application provides a bacillus megaterium and application of the bacillus megaterium in preparation of nano selenium organic fertilizer for increasing selenium content of tea, and belongs to the technical field of microorganisms, wherein the bacillus megaterium NT2 is preserved in China Center for Type Culture Collection, and the preservation number is CCTCC NO:M 20251806; the bacillus megaterium NT2 has strong tolerance and reduction capacity to selenium elements, can survive in high-concentration inorganic selenium, and reduce the inorganic selenium into nano selenium, and has weak capacity to enrich arsenic, cadmium and lead; can be mixed with high-temperature calcination activated high-selenium rock powder to carry out mixed fermentation, to prepare a selenium source of nano selenium organic fertilizer, to increase the selenium content of tea while ensuring that the heavy metal content does not exceed the national standard. The bacillus megaterium provided by the application can reduce the toxicity of inorganic selenium in high-selenium rock and convert it into nano selenium, and can stably, safely and standardly produce selenium-rich tea, so that the heavy metal content of tea does not exceed the standard, and the application has a broad market prospect.

This invention discloses a small-diameter, high-flow-rate microporous chemical oxygen generator and its preparation method, relating to the field of chemical oxygen generator technology. The small-diameter, high-flow-rate microporous chemical oxygen generator comprises an ignition propellant and an oxygen-generating propellant. The oxygen-generating propellant has a pit for holding the ignition propellant. The raw materials of the oxygen-generating propellant, by mass percentage, include: sodium chlorate 55%–75%, catalyst 4%–10%, chlorine inhibitor 2%–8%, metal powder 4%–10%, pore-forming component 5%–20%, kaolin 4%–10%, and water 0.5%–2%, wherein the pore-forming component includes at least one of ammonium carbonate and ammonium bicarbonate. This invention increases the combustion surface of the oxygen-generating propellant by forming micropores on its surface and inside, achieving a large flow rate of oxygen within a limited volume. Furthermore, operators can determine whether the propellant is completely dried by observing the presence or absence of odor during the drying process, thereby ensuring product uniformity and the purity of subsequent oxygen.

This invention discloses a method for preparing calcium ferrite from iron-based solid waste through low-temperature catalytic decomposition of phosphogypsum, belonging to the field of comprehensive utilization of solid waste. The method involves mixing, granulating, and roasting raw materials, including iron-based solid waste and phosphogypsum, to obtain calcium ferrite-containing sintered material. The roasting process involves feeding the material onto a belt roaster, first performing reduction roasting under a reducing atmosphere, and then performing oxidative roasting under an oxidizing atmosphere. This method fully utilizes the mineral composition characteristics of iron-based solid waste and phosphogypsum from the steel industry. By controlling the temperature and atmosphere during the high-temperature solid-phase reaction, the method achieves the directional transformation of iron and calcium components in the two industrial solid wastes into calcium ferrite-based products, while effectively removing harmful elements, resulting in high-quality calcium ferrite products.

This invention relates to the field of rubber additive preparation technology, and provides a microcapsule for rubber foaming agents. By weight, it comprises the following raw materials: core material: 50-80 parts chemical foaming agent, 1-5 parts dispersant, and 100-200 parts deionized water; wall material: 20-40 parts methyl methacrylate monomer, 10-30 parts ethylene-octene copolymer emulsion grafted with maleic anhydride, 0.5-2 parts initiator, and an appropriate amount of pH adjuster. The apparatus includes a premixing tank, a main reactor, a secondary reactor, a dehydration chamber, a heating tank, and a heat exchange tank, all connected in series via a diaphragm pump. By employing a double-layer composite wall material—an inner layer of rigid and tough barrier and an outer layer of flexible and compatible material—the problem of easy breakage during mixing of traditional single-layer brittle wall materials is solved. The 70°C hot water discharged from the main reactor is cooled to 50°C by the heat exchange tank and supplied to the secondary reactor, achieving cascaded utilization of thermal energy. A reversing component allows for switching between heating, water replenishment, and cleaning pipelines, resulting in a compact structure and simple operation.

The application provides a resourceful treatment method of sodium chloride-containing waste and polyvinyl chloride waste, and belongs to the technical field of waste treatment. The resourceful treatment method comprises the following steps: mixing sodium chloride-containing waste, polyvinyl chloride waste, a promoter and a solid halogen agent, and performing calcination treatment to obtain calcined material; mixing the calcined material with water, and performing solid-liquid separation to obtain liquid material and solid material; the solid material is recovered promoter; and the liquid material is crystallized to obtain recovered sodium chloride. The resourceful treatment method can remove organic pollutants in the sodium chloride-containing waste, effectively fix the chlorine element in the polyvinyl chloride waste, prevent the chlorine element from escaping, and reduce the harm to the environment.