98results about How to "Low concentration requirement" patented technology

The invention discloses a method for recovering lead from a lead-containing material by matching a leaching-electrowinning method. The method comprises the following steps of: selectively leaching the lead from the lead-containing material at the temperature of -95DEG C by using a mixture of 0.005-0.5M ethylenediaminotetraacetateedetate and 0.05-1.0M alkali as a leaching agent, and filtering and separating to obtain a lead-containing solution; and separating out metal lead powder from the solution by using an electrowinning method, blending electrowinning waste liquor, and returning to the leaching step. By leaching lead from secondary zinc oxide soot, the grade of zinc in secondary zinc oxide and the leaching rate of subsequent leaching can be improved, and subsequent treatment is facilitated; and by leaching lead from low-grade lead slag containing lead oxide, lead sulfate or lead chloride, the leached sewage in the slag piling process never contains lead or contains little lead, environment is not affected, the waste is changed into treasure, and the lead can be recovered from the lead slag. The method has the advantages of simple flow, simple operation, low energy consumption and the like, and can be widely used for treating lead-containing secondary zinc oxide materials and low-grade lead slag.

The invention discloses a treatment method of nitrogen and phosphorus-containing waste water. The three-step treatment including magnesium ammonium phosphate reaction, biochemical treatment and deep treatment is sequentially performed on nitrogen and phosphorus waste water phosphorus containing high-concentration ammonium salt and phosphate; a great number of ammonium salts and phosphate can sequentially react with Mg<2+>; MgNH4PO4.6H2O is recovered to be reused as a slow-release fertilizer; through the biochemical treatment on primary treatment liquid supernatant containing low-content ammonium salt and phosphate, ammonia, nitrogen and partial PO4<3-> ions can be removed; finally, through Ca<2+> ions, a small number of PO4<3-> ions remained after the biochemical treatment can be treated;the outlet water stability can be ensured; the standard reaching discharging is reached.

The invention relates to the technical field of filtering separation of membranes, in particular to a rotating disc type dynamic membrane separating assembly. The rotating disc type dynamic membrane separating assembly comprises a machine frame, an outer cylinder and a motor, wherein the outer cylinder is vertically arranged on a mounting plate, the lower port of the outer cylinder is connected with the mounting plate through sealing components, and a separation barrel is arranged in the outer cylinder; a dynamic sealing bearing is arranged on the mounting plate, a hollow shaft is arranged on the dynamic sealing bearing in a rotating manner, and a plurality of filtering discs are arranged in the separation barrel; a belt wheel is arranged on the hollow shaft under the dynamic sealing bearing, and the motor is arranged on the machine frame on one side of the outer cylinder and connected with the belt wheel in a transmission manner. According to the rotating disc type dynamic membrane separating assembly disclosed by the invention, organic filtering materials in various flux specifications can be mounted on the filtering discs, the filtering discs in flat design can improve the filling densities of the organic filtering materials, and hollow flow baffles in fluid flow passage design are arranged among the filtering discs, so that a good hydraulic shear effect and rotary currents are formed on the surfaces of the membranes of the filtering discs by the flow baffles, the membrane pollution can be reduced, the generation of the concentration polarization can be alleviated, the decay speed of membrane flux is lowered, and the cleaning and maintaining period is shortened.

The invention belongs to the technical field of nonferrous metallurgy and particularly relates to a comprehensive recovery processing method for cobalt-sulfur concentrates. The comprehensive recoveryprocessing method comprises the following steps: carrying out oxidizing boiling roasting on the cobalt-sulfur concentrates so as to obtain roasted sand and SO2 flue gas, carrying out purification anddust removal on the SO2 flue gas, introducing the SO2 flue gas into a flue gas acid-making system, and carrying out acid making; after the roasted sand is cooled, carrying out ball milling so as to obtain fine particles, carrying out pulpifying and presoaking on the fine particles, carrying out continuous and selective leaching by virtue of a continuous pressurizing system, pre-neutralizing lime milk ore pulp so as to obtain supernate and a filter residue, treating the supernate, introducing the supernate into a copper extraction system, and carrying out extraction, so as to obtain cathode copper, an electrodeposited liquid and raffinate; and washing the filter residue to obtain a washing liquid, carrying out pulpifying and presoaking on the roasted sand by virtue of the electrodeposited liquid and the washing liquid which are taken as a pulpifying liquid, introducing raffinate into a cobalt precipitation process and a magnesium precipitation process, carrying out cobalt precipitationand magnesium precipitation so as to obtain cobalt and magnesium solids, and transporting the cobalt and magnesium solids to a residue field, and carrying out stockpiling. According to the method, cobalt and copper in ores can be effectively recycled once, the recovery rates of cobalt and copper are high, low grade cobalt and sulfur concentrates can be effectively treated, and the maximal utilization of resources is realized.

The invention belongs to the field of micro-fluidic chips, and relates to a biological macromolecule detection method. An alpha-LISA technology and a droplet-based microfluidics technology are combined and optimized to prepare a micro-fluidic chip liquid. A novel biological macromolecule detection method with a high sensitivity is provided. A three-phase mixing technology is adopted. A passive mixing structure is used to fully and evenly mix the reaction liquid. A cross focusing technology is used to form droplets. The generated droplets have the advantage of smaller volume, and thus the reactions become faster. Moreover, the requirements on the samples are lower, the reactions are specific, sensitive, fast, and full; the washing does not need to be carried out after reactions; complicated complexes such as complete proteins, enzyme complex, bacteriophage, and the like, can be detected; the technical bottleneck of conventional commercial liquid chips at present can be broken through; the provided method can be applied to fast clinical biological macromolecule detection; the detection sensitivity and specificity are both improved, and the required sample amount is reduced.

This invention relates to a method for preparing superfine prednisolone powder, and belongs to the field of micronization. Open question at present: particle diameter of prednisolone is small but can not obtain dry powder, or the dry powder has wide size distribution, bad redispersibility, and instability in water. The invention is to realize the preparation of prednisolone granule with controllable particle diameter, narrow particle size distribution, and superfine or nano-graded quadrilate and hexagon through inverse solvent recrystallization.the prednisolone of the invention has the advantages of controllable particle diameter, narrow particle size distribution, good redispersibility, stable micropowder, and good dissolving effect; and has prodigious dominance in the development of drug effect and new medicament form.

The invention discloses a method for recovering tellurium by swirl electrolysis of a tellurium-containing solution, which comprises the following steps: adding concentrated sulfuric acid into the tellurium-containing solution until the pH value of the tellurium-containing solution is 5.7-6.5, controlling the temperature of the tellurium-containing solution to be higher than React at 90°C for 2 to 4 hours, filter; leach the filter residue obtained after filtration with sodium hydroxide solution; perform swirl electrolysis on the leaching solution obtained after leaching, and take out the cathode after swirl electrolysis; The solution is boiled, washed, and dried to obtain high-purity tellurium. The invention adopts swirl electrolysis to recover tellurium in the tellurium-containing solution, which avoids the influence of unfavorable factors on electrowinning such as the decrease of current efficiency and the increase of concentration polarization caused by the slow flow of the solution in the traditional electrolysis process, and shortens the electrolysis cycle of tellurium , which reduces the concentration requirements of impurity elements in the electrolyte, and has many advantages such as high selectivity, high current density, and high product purity.

The invention relates to a horizontal flow precipitation separation device. The horizontal flow precipitation separation device is characterized by comprising multiple corrugated plates arranged in a precipitation pond, wherein each corrugated plate is vertically arranged relative to a horizontal plane, the adjacent corrugated plates are symmetrically arranged and are spaced, and the smallest interval of the adjacent corrugated plates serves as a sludge discharging channel. Compared with the prior art, the horizontal flow precipitation separation device preserves the advantages that a flow direction and a precipitate sludge discharging direction are mutually vertical without interfering with each other, the disturbance between the horizontal flow and a precipitate is avoided, the submerged sludge is prevented from suspending again, meanwhile, a sludge discharging manner is optimized, the vertical sludge discharging channel is adopted, when stream horizontally flows through a stream channel, suspended solids are collided with a frame of the stream channel to rapidly precipitate, and slide downwards along the frame to enter the sludge discharging channel so as to directly precipitate to the bottom of the precipitation pond, and a wobble plate does not need to bear load, so that a problem of load-bearing of the wobble plate caused by large precipitate quantity is solved.

The invention relates to a particulate matter detection device and a detection method, in particular relates to a detection device and a detection method based on a dielectrophoresis and electrical impedance measurement technology, and more in particular relates to an electrical impedance detection device utilizing a microfluidic chip and application of the electrical impedance detection device todetection of target particles.

The invention relates to the technical field of gene polymorphism detection, in particular to a detection method of yak FOXO1 gene single nucleotide polymorphism and a kit thereof. The detection method comprises the following steps: 1) preparing a yak FOXO1 gene amplification product; 2) synthesizing a high and low temperature interior label; 3) preparing an HRM-PCR (High Resolution Melt-Polymerase Chain Reaction) amplification product; 4) collecting a fluorescence signal. Compared with an HRM method used for detecting polymorphic sites in the prior art, a gene probe designed by the detection method is more accurate and flexible in positioning, is accurate in parting, does not need PCR post-processing, has high working efficiency and good repeatability and is low in sample quality and quantity requirements, especially, the concentration requirement of a DNA template can be lowered to 0.1ng/mu L, and time and labor are saved when a sample size is large. Meanwhile, the detection kit has the advantages of high sensitiveness, high detection speed and good stability.

The invention discloses a photohydroionization air purifier, which comprises a ventilated encloser and an electric cabinet. The encloser is provided with a photon wave generating tube and a nanometer catalytic coating inside. The photon wave generating tube is connected with the electric cabinet. The air purifier can be arranged in an air duct of a central air-conditioning, through the process of photohydroionization, to kill various bacteria and viruses in the air rapidly and effectively to remove various peculiar smell and odor in the air, and to oxidize and decompose chemical toxic and harmful gas in the air. In particular, the encloser is provided with a grid plate with a catalytic coating, which can maximize the effect of air purification. The air purifier can fully and efficiently purify the air, and the purification process does not produce chemical residual substance and avoids secondary pollution.

The invention discloses a method of extracting defibrase from snake poison and preparing defibrase injection preparation, and the process of extracting defibrase includes the steps: preparing monoclonal antibody; preparing crude defibrase; preparing antibody affinity chromatography column; preparing defibrase; and the process of preparing the defibrase injection preparation includes the steps: taking and adding purified defibrase to a proper amount of injection water for dissolving so as to obtain a solution, adding 5-20g NaCl stabilizer to every 1000ml solution, making split charging and obtaining the defibrase injection preparation.

The invention discloses a method for preparing cellulose nanocrystals. The method comprises the following steps of: (1) putting refined cotton linter into water of which the mass is 10 to 20 times that of the refined cotton linter, and performing ultrasonic stirring in an ultrasonic generator for 4 to 8 hours; (2) continuously adding a 0.5mol/L sulfuric acid aqueous solution of which the mass is 5 to 8 times that of the refined cotton linter and a 0.5mol/L hydrochloric acid aqueous solution of which the mass is 2 to 6 times that of the refined cotton linter into the ultrasonic generator, and performing ultrasonic stirring at the temperature of between 30 and 60 DEG C for 8 to 12 hours; and (3) washing a solid product obtained in the step (2) by using water until the pH value is 6 to 7. The method is simple in process and low in cost; and the prepared cellulose nanocrystals are uniform in granularity and high in performance.

The invention relates to a method and equipment for producing acetal through catalytic distillation. Through the application of a catalytic rectifying tower and an ethanol recycle tower, the method comprises the following specific steps of: (1) feeding a raw material, namely ethanol into a lower feeding hole of the catalytic rectifying tower after passing through a metering pump and a preheater, feeding a raw material, namely an acetaldehyde solution into an upper feeding hole of the catalytic rectifying tower after passing through the metering pump, wherein aldolization happens between the raw material acetaldehyde and ethanol at the middle part of the catalytic rectifying tower, and carrying out vapor-liquid mass transferring; (2) condensing mixed vapor of acetal and ethanol obtained at the top of the catalytic rectifying tower through a condenser, wherein a part of the condensed mixed vapor flows back to the top of the catalytic rectifying tower through a reflux pump, and collecting the remaining mixed vapor out as product; and (3) pumping waste water discharged out at the bottom of the catalytic rectifying tower into the middle part of the ethanol recovery tower to carry out distillation and separation, and condensing azeotrope steam of ethanol and water obtained at the top of the tower through the condenser, wherein a part of the condensed azeotrope steam flows back to the top of the ethanol recovery tower by depending on gravity, and the remaining condensed azeotrope steam flows back to the ethanol inlet of the catalytic rectifying tower for cyclic utilization. The device has the advantages of being high in yield, small in circulating amount, low in energy consumption and the like.

The invention discloses a device and a method for producing high-concentration dimethyl carbonate. Low-concentration dimethyl carbonate is separated in a light component removal column, a part of light components is refluxed and the other part of light component and heavy components are fed into a methanol fuel tank; a mixture of dimethyl carbonate and methanol is extracted from the side line andis fed into a pressurized column; through separation in the pressurized column, high-concentration dimethyl carbonate is obtained at the column bottom and conveyed to a refining column for further purification; a methanol azeotrope containing 15-18% of dimethyl carbonate is distilled off from the column top, a part of the azeotrope is refluxed, and the other part of the methanol azeotrope is sentto an atmospheric-pressure column; through separation in the atmospheric-pressure column, an azeotrope containing dimethyl carbonate and methanol and having a concentration of 30% is distilled off from the column top, a part of the azeotrope is refluxed, and the other part of the azeotrope is sent to the pressurized column; methanol is discharged from a column bottom and conveyed into the methanolfuel tank; the high-concentration dimethyl carbonate is separated in the refining column, a part of light components is refluxed, the other part of light component and heavy components are fed into the methanol fuel tank, and high-purity dimethyl carbonate with the content of 99.9% or above is extracted from the side line to serve as a product.

The invention relates to a novel sewage treatment device. The novel sewage treatment device comprises a reaction tank, wherein the reaction tank is separated into an aerobic zone, an anaerobic oxygen-poor zone and an anaerobic zone; the side wall is provided with a water inlet hole and a mud scraper is arranged at the bottom; a mud bucket is arranged below the reaction tank; the mud bucket is internally provided with a pushing device; a separation plate is provided with an aeration device and is accumulated with an AO reactor; a water passing hole and a water passing weir are arranged on the upper part of the reaction tank; a sludge reflowing hole and a liquid supernatant reflowing hole which is connected with a liquid supernatant pumping-out hole of a sedimentation basin are formed in the side wall of the reaction tank; the sedimentation basin and the reaction tank share one side wall; the sludge reflowing hole on the lower part of the sedimentation basin is communicated with the bottom of the sedimentation basin; the sedimentation basin is internally provided with a horizontal flow sediment separation device; a clean water outlet hole is formed in the side wall of the sludge sedimentation basin; the clean water outlet hole is formed above the horizontal flow sediment separation device; a water outlet weir is arranged on the outer side wall of the sedimentation basin. According to the novel sewage treatment device, the plane occupied area is greatly reduced; organic carbon in raw water can be sufficiently utilized to be used as a carbon source needed by a denitrification process of the oxygen-poor zone can be sufficiently utilized so that the adding amount of the additionally-arranged carbon source is reduced and the whole performance of a sewage treatment system is strengthened.

The invention provides a preparation method of diaminodiphenyl ether. The method comprises the following steps: under the catalysis of solid acid, mixing aromatic ether and nitric acid for nitration reaction; carrying out hot filtration on the nitration reaction product, recovering the filtrate, and carrying out post-treatment on the filtrate; and reducing the filtrate subjected to post-treatment to obtain the diamino diphenyl ether. According to the invention, the requirement of nitration reaction on the concentration of nitric acid is greatly reduced, the yield of the diamino diphenyl ether is increased, and the preparation process is environmentally friendly, efficient and low in cost.

The invention discloses a construction of an up-conversion weak light detector and an application thereof in detecting glutathione and relates to the construction of an up-conversion weak light detection instrument. The detection instrument has the main advantages of (1) excellent detection performance and capability of detecting alpha-phase UCNPs with simple synthetic method and weak luminescenceduring the process of detecting UCNPs, and (2) low demand on UCNPs concentration and capability of detecting UCNPs in an approximately homogeneous system. In addition, the invention develops a biosensor taking a rare earth doped up-conversion nanometer material as a fluorescence probe and the application thereof in detecting GSH. The fluorescence response value of the sensor and the GSH concentration within the scope of 0.5-100uM have an excellent linear relation; the detection limit is 0.24uM; thus, the up-conversion weak light detector is expected to become a novel detection method for up-conversion luminescence and can be applied to more fields.