6results about How to "Rapid solid-liquid separation" patented technology

The application discloses a solid superacid catalyst and a preparation method and application thereof, and relates to the technical field of catalysts, and specifically discloses the preparation method of the solid superacid catalyst, which comprises the following steps: dissolving a zirconium source, a titanium source, silica sol, urea and hexadecyl trimethyl ammonium bromide in water to prepare a precursor solution; heating the precursor solution to react, wherein the pH value of the system is increased from acidity to alkalinity during the reaction, and a reaction slurry is obtained; performing hydrothermal aging treatment on the reaction slurry, and then collecting the obtained precipitate; treating the precipitate with a rare earth salt solution to obtain a rare earth modified product; immersing the rare earth modified product in a sulfuric acid solution; and performing calcination on the immersed product to obtain the solid superacid catalyst. The solid superacid catalyst provided by the application has a regular sheet-like morphology and a composite structure of silica-rare earth synergistically anchoring sulfate, can guarantee high catalytic activity, realize strong anchoring of active components and rapid separation of the catalyst, and significantly improves the recycling stability.

The invention belongs to the technical field of polyester recovery, and relates to a method for preparing BHET by catalyzing ethylene glycol alcoholysis of PET. According to the method, gamma-Fe2O3 (at) meso-SiO2-DBU is adopted as a catalyst, the gamma-Fe2O3 (at) meso-SiO2-DBU is composed of gamma-Fe2O3 (at) meso-SiO2 and DBU, the gamma-Fe2O3 (at) meso-SiO2 is of a core-shell structure, the core is gamma-Fe2O3, the shell is composed of meso-SiO2, the DBU and the shell form ion pairs through electrostatic attraction, and the ion pairs are enriched in mesopores of the meso-SiO2. The problem that the yield of BHET is low in an existing magnetic separation heterogeneous catalysis system is solved, the conversion rate of PET and the yield of BHET are effectively increased, and the catalyst is stable in structure and lasting in catalytic activity, can be magnetically separated and recycled and adapts to the strict reaction conditions for catalyzing ethylene glycol to depolymerize PET.

The invention relates to the technical field of waste liquid treatment, in particular to a self-adaptive pH amphoteric polymer-calcium salt compounded bentonite slurry rapid sedimentation treatment method. According to the method, a calcium salt working solution, a buffer working solution, an amphoteric polymer working solution and a functionalized calcium carbonate micro-powder dispersion solution are added in stages, and the stirring speed and time are accurately controlled, so that rapid sedimentation of the slurry is realized. The amphoteric polymer is formed by copolymerizing a plurality of monomers and has wide pH adaptability; the functionalized calcium carbonate micro powder is used as a weighting carrier to enhance the floc density. The method solves the problems of slow sedimentation, high supernatant turbidity and poor adaptability to water quality fluctuation in the traditional method, has the advantages of high sedimentation speed and high supernatant clarity, can be directly reused, and is suitable for bentonite slurry treatment in the fields of electric power engineering and the like.

A high-efficiency micro-sand circulating sedimentation device relates to the field of wastewater treatment technology. It comprises a flocculation reaction system, a maturation reaction zone, a high-efficiency settler, a flocculant dosing device, and a micro-sand circulating system. The high-efficiency settler houses the flocculation reaction system, which includes an inner tank with a rotating stirring shaft inside. The upper part of the flocculation reaction system is a mixing reaction zone. A wastewater pipe is connected to the outside of the inner tank, and a static mixer and a check valve are installed at the upper end of the wastewater pipe. Based on traditional flocculation sedimentation tank theory, micro-sand is added to accelerate floc agglomeration and sedimentation, shortening the residence time in the sedimentation tank and achieving rapid solid-liquid separation. This invention features an integrated design, saving space and energy. The device consists of a flocculation reaction system, a maturation reaction zone, a high-efficiency settler, a flocculant dosing device, a polymer coagulant aid dosing device, a cyclone sludge separation device, a micro-sand circulating replenishment device, and a PLC electrical control system.

A kind of calcified biomass red mud quick solid-liquid separation device belongs to the field of solid-liquid separation after bauxite dissolution, including: stirring shaft, ore pulp feeding pipeline, venturi device, settling tank body, clear liquid overflow tank, spiral flow guide bucket, electromagnetic induction coil, rake, underflow outlet.Ore pulp feeding pipeline is arranged at the top of settling tank body, liquid inlet is connected with the horizontal direction of spiral flow guide bucket tangential, ore pulp feeding pipeline is additionally provided with venturi device, and multiple flocculating agent adding ports are installed at the narrow place of venturi device;Spiral flow guide bucket is arranged in the settling tank body and is fixed at the upper part of the settling tank, and the inside of spiral flow guide bucket is provided with spiral downward lines;Electromagnetic induction coil is additionally provided outside spiral flow guide bucket;Stirring shaft is deeply into the settling tank body, stirring shaft bottom is connected with rake by connecting rod, and red mud leaves the settling tank from underflow outlet;Clear liquid is discharged from the top of settling tank body by clear liquid overflow tank;The device realizes the rapid solid-liquid separation of bauxite dissolution ore pulp.

This invention discloses a method for recycling high-salt dyeing and finishing wastewater, belonging to the field of dyeing wastewater treatment technology. Addressing the problems of traditional coagulants' easy failure in high-salt environments, difficulty in solid-liquid separation, and inability to regenerate and recycle, this invention uses a magnetic composite coagulant for coagulation and sedimentation. Rapid solid-liquid separation is achieved through an external magnetic field, and the separated magnetic composite coagulant is recycled after alternating water washing and desorption. The wastewater is subsequently treated by oxidation, evaporation and crystallization to recover salts, and activated carbon adsorption for deep treatment before being reused in production. The magnetic composite coagulant has a core-shell structure and a temperature-sensitive polymer graft layer, possessing high salt resistance, magnetic response, and temperature-sensitive desorption characteristics. This invention achieves efficient flocculation, rapid magnetic separation, and intelligent desorption and regeneration in high-salt environments, significantly reducing reagent consumption and operating costs. The effluent quality meets the requirements of the "Water Quality Standard for Reclaimed Water in Textile Dyeing and Finishing Industry".