47results about How to "Flexible process control" patented technology

The invention belongs to the technical field of porous ceramic materials and their preparation and especially discloses a pure silicon carbide filtering membrane and a preparation method thereof. The pure silicon carbide filtering membrane has a high porosity, a low pressure drop, high strength, good thermal shock resistance and a high use temperature. The preparation method can be realized easily and can guarantee product performances. The pure silicon carbide filtering membrane comprises pure SiC, is a surface membrane layer obtained by pile-up and binding of fine SiC particles and has aperture sizes of 0.1 to 20 microns and membrane porosity of 25 to 50%. Fine SiC particles, silicon powder, a pore-forming additive and one or more organic resins as raw materials are prepared into a surface membrane layer by spraying or dipping and the surface membrane layer is dried and sintered to form the pure silicon carbide filtering membrane. The pure silicon carbide filtering membrane can be used in an oxidation atmosphere and in a reducing atmosphere, has strong acid corrosion and alkaline corrosion resistance, and can be used for various high / low temperature fluid filtering purification fields such as coal gasification chemical engineering, integrated gasification combined cycle (IGCC) and pressurized fluidized bed combustion (PFBC) coal gasification power generation, and high temperature flue gas, automobile exhaust and water purification.

The invention discloses a thin strip continuous casting method, that is, molten steel enters the molten pool formed by crystallization rolls, and is cooled and lightly rolled by the crystallization rolls to form a cast strip. In the width direction of the strip, the gas is sprayed on both sides of the cast strip for forced cooling, so that the cast strip is cooled to the temperature required by the process, and then it is hot-rolled and controlled to cool until it is coiled. The device of the present invention includes two blowing, connecting rod transmission and synchronous mechanisms that are respectively arranged on both sides of the casting belt; the blowing mechanism includes bearing seats, support shafts, nozzles, etc.; The rod is connected with the support shaft; the synchronous mechanism includes a moving trolley, a rack, a gear, a trolley driving device, etc. The angle between the nozzle and the casting belt is adjusted by the rotation of the support shaft; the distance between the nozzle and the casting belt is adjusted by the synchronous movement of the moving trolley. The invention can effectively improve the surface and internal quality of the cast strip, increase the productivity and expand the production of steel types.

The present invention proposes a method and equipment for extracting phosphate rock with 93%-98% concentrated sulfuric acid to produce phosphoric acid. Sulfuric acid and phosphate rock pulp are respectively added to two series-connected cylindrical reaction tanks of equal volume according to a certain ratio. The reaction tank is equipped with several sulfuric acid distributors and surface coolers, as well as a single central stirring paddle with large circulation. The cold air passes over the surface of the slurry thrown by the surface cooler and the sulfuric acid distributor, and the cold air is heated and humidified, thereby taking away the water vapor and removing the heat of reaction. The extraction reaction is carried out in two reaction tanks at the same time, and the operating conditions of the two tanks can be controlled separately, which is more conducive to the decomposition of phosphate rock and the coarse crystallization; the sulfuric acid is easy to disperse and more uniform under the sprinkler of the sulfuric acid distributor, and will not produce local A lot of SO 4 2- excess. The invention has strong adaptability to phosphate rock and can effectively improve the P 2 o 5 Improve the extraction rate, improve the crystallization of calcium sulfate dihydrate, and improve the filtration strength.