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331results about How to "Reduce fouling" patented technology

Technology for recovering production of electrolytic copper and zinc from smelting ash

The invention discloses a technology for recovering production of electrolytic copper and zinc from smelting ash. The technology comprises a step of smelting ash leaching, a step of copper extraction and purification through copper electrodeposition, a step of iron removal through neutralization, a step of cadmium removal, and a step of zinc extraction and purification through zinc electrodeposition. The method is characterized in that chemical components in the smelting ash are analyzed, and the smelting ash is leached by a sulfuric acid solution leaching agent; the leachate obtained after the above leaching reaction undergoes a separation operation of copper extraction and purification through the copper electrodeposition; the resultant copper extraction liquor is neutralized by high-zinc dust which is a neutralizer to remove iron; cadmium is displaced and deposited by zinc powder having a mass same with cadmium after the iron removal through the neutralization; and the zinc extraction is carried out through the zinc electrodeposition by casting zinc ingot products. The technology has a wide adaptability, adopts two steps to complete the exchange reaction of zinc oxide and copper oxide in the raw material with an acid, and adopts the high-zinc dust as the neutralizer, so the massive zinc loss caused by entrainment of routine neutralizers comprising calcium oxide and sodium hydroxide is avoided. A zinc extraction liquor obtained in the above step is purified by N235, so economy and effectiveness are realized.
Owner:江西自立环保科技有限公司

System and method for treating water recycled from straw pulp papermaking wastewater

The invention discloses a system and a method for treating water recycled from straw pulp papermaking wastewater. The system is formed by sequentially or respectively connecting a regulating tank, a primary efficient coagulative precipitation tank, a secondary efficient coagulative precipitation tank, a middle water tank, an ultrafiltration membrane treatment device, a reverse osmosis membrane treatment device, an ozone contact oxidation tower, an active carbon adsorption tower, an acid regulating tank, a higher oxidization reaction tank, a neutralizing precipitation tank and a water-producing tank. The system organically combines the coagulative precipitation treatment, the higher oxidization treatment, the ozone catalysis oxidation treatment and the treatment of an ultrafiltration membrane and a nanofiltration membrane, treats the water recycled from the straw pulp papermaking wastewater by using a physical and chemical treatment technology and a shunting treatment and combined effluent treatment process and mode, can ensure that the large scale recycled water of the straw pulp papermaking industry reaches the requirement of reuse water after treated and does not affect a papermaking process and a paper product on the premise of ensuring the low operating cost, and the treated reverse osmosis concentrated water reaches the emission standard of the industry.
Owner:BEIJING SOUND ENVIRONMENTAL ENG

Membrane bioreactor capable of realizing synchronous nitration denitrification denitrogenation function

The invention relates to the treatment of industrial wastewater and domestic sewage containing nitrogen, in particular a membrane bioreactor (MBR) which can realize the function of synchronous nitrogen removal of nitrification and denitrification. The reactor comprises a reactor cylinder, a membrane component, spherical elastic filler, dissolved oxygen (DO) electrode, a pH electrode, a thermometer and other on-line monitoring and controlling components. A water production end on an internal membrane component of the MBR is connected with a water production pressure gauge and a vacuum pump. Except the membrane component, the inside of the MBR is also evenly provided with the spherical elastic filler which forms an integer by connecting in series from top to bottom and is fixed on the top and bottom of the reactor. The bottom of the MBR has a micropore aerator connected with an air pump for the aeration utilization of the MBR. The membrane bioreactor introduces the porous spherical elastic filler into the MBR and regulates the micro-environment inside the MBR, so as to realize the function of synchronous nitrogen removal of nitrification and denitrification. The membrane bioreactor has small land occupancy and simple operation, saves energy consumption, can remove a plurality of pollutants of organic matters, ammonia nitrogen, etc., and is applicable to the treatment of industrial organic wastewater, domestic sewage, etc.
Owner:SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI

Marine heat pipe type seawater desalination device

The invention belongs to the field of seawater desalination, and particularly relates to a marine heat pipe type seawater desalination device. The marine heat pipe type seawater desalination device is composed of a pressure gage, a liquidometer, heat pipes, a liquid distributor, a baffling plate, a snuffle valve, a cylinder body, a support, a one-way valve, a fresh water pump, a jet flow vacuum pump, a seawater pump, a partition plate, a demister and connecting pipelines. The marine heat pipe type seawater desalination device provided by the invention fully utilizes the advantage that the heat conductivity coefficient of a gravity heat pipe is high, adopts the heat of the cooling water of a ship engine as a heat source, and can greatly reduce the seawater boiling point under the vacuum environment created by the jet flow vacuum pump driven by a centrifugal pump; the seawater is distilled under the lower boiling point, thus the seawater desalination device provided by the invention has the advantages that the manufacture is simple, the structure is compact, the material consumption is less, the dual purposes that the cooling water of the ship engine is recycled and fresh water of a ship body is autarkical are achieved, the maintenance is convenient, the cost is low, the service life is long, and the installation space is small.
Owner:QINGDAO UNIV OF SCI & TECH

Method for modifying Bayer process, processing low-grade diaspore bauxite and producing alumina

The invention provides a method for modifying a Bayer process, processing low-grade diaspore bauxite and producing alumina. The method comprises steps that: (1) silicon is chemically pre-removed, wherein the low-grade bauxite is immersed into a sodium aluminate solution containing a stabilizing agent, such that a slurry containing dissolved silica is obtained; (2) obtained high-silicon sodium aluminate solution is processed through desilication, wherein desilication crystal seeds are added to the slurry processed through filtration, such that desilication is carried out; (3) the sodium aluminate solution is processed through seed precipitation, wherein aluminum hydroxide crystal seeds are added to the sodium aluminate solution processed through desilication, such that seed precipitation is carried out; (4) the obtained aluminum hydroxide product is baked, such that an alumina product is obtained; (5) a high-pressure dissolution process is carried out, wherein the obtained seed precipitation mother liquor is processed through evaporation and alkali supplementation, and is used in high-pressure dissolution of a concentrate obtained in the step (2); a stabilizing agent is added to the obtained sodium aluminate solution, the sodium aluminate solution is then used for processing the next batch of bauxite, and the steps (1) to (4) are repeated. The method provided by the invention is suitable to be used for processing low-grade diaspore bauxite. With the method, a silicon scaling problem in alumina industries can be effectively solved, energy consumption can be substantially improved, and the quality of the finished product alumina can be improved.
Owner:INST OF PROCESS ENG CHINESE ACAD OF SCI

Water purification system and control method thereof

The invention provides a water purification system which comprises a concentrated water emission control unit, wherein the concentrated water emission control unit comprises a first branch, a second branch and a wastewater ratio assembly; a water outlet end of the first branch is connected with a water inlet pipeline; the first branch is provided with a first electromagnetic valve; a water outlet end of the second branch is connected with a water outlet section of a concentrated water pipeline or is directly evacuated; the second branch is provided with a second electromagnetic valve; and a water inlet end of the first branch and a water inlet end of the second branch are connected to a concentrated water pipeline between a concentrated water outlet of a reverse osmosis membrane treatment unit and a concentrated water emission electromagnetic valve through the wastewater ratio assembly. The first electromagnetic valve on the first branch and the second electromagnetic valve on the second branch are controlled to open and close intermittently, thereby implementing concentrated water intermittent reflux, reducing the concentrated water emission, and enhancing the recovery rate of the water purification system. The concentrated water reflux is intermittent and controllable, thereby greatly lowering the reverse osmosis membrane pressure and avoiding the shortening of the service life.
Owner:GREE ELECTRIC APPLIANCES INC

Garbage leachate treatment process

The invention discloses a garbage leachate treatment process; a garbage leachate is treated by an adjusting pool, an anaerobic biological treatment unit, a minisize anaerobic-aerobic treatment unit, a membrane bioreactor and an evaporation system (MVC) in turn, and through evaporation, distilled water formed from water and ammonia reaches standards and is discharged after passing through a cation-anion resin exchange system; non-condensable gas reaches standards and is discharged after passing through a deodorization system, and a concentrate is discharged out of the evaporation system; the garbage leachate treatment process is respectively subjected to anaerobic biological treatment, minisize anaerobic-aerobic treatment and membrane bioreactor treatment before evaporation treatment, so as to greatly alleviate the operation burden of the evaporation system (MVC), relieve the fouling problem of the evaporation system (MVC) to a largest extent and reduce the frequency of cleaning; the garbage leachate treatment process is applicable to treatment of conventional high-COD and high-NH3-N garbage leachates, at the same time, is applicable to treatment of leachates with different landfill ages or different types through adjustment of related process parameters, and effectively relieves the burden of process operation.
Owner:江苏金恒环境科技有限公司

Anaerobic reactor

The invention relates to an anaerobic reactor. The anaerobic reactor comprises a cylinder body, a water inlet pipe, a water outlet pipe, a filling device on the middle part of the water outlet pipe, a water distribution device at the bottom of the filling device and a sludge discharge device at the bottom of the water distribution device; the water distribution device comprises a water distribution main pipe and more than four closed annular water distribution branch pipes; water outlet holes of the water distribution branch pipes are alternately arranged along more than three concentric circumferences; the cylinder body is positioned on the upper part of the filling device; the lower part of each water distribution branch pipe is provided with more than two water outlets; the water outlets are connected with the water outlet pipe; a reflowing pipe of the water outlet pipe is mixed with the water inlet pipe by a circulating pump and is communicated with the water distribution main pipe; a first medicating device and a second medicating device are communicated with the water inlet pipe respectively through connecting pipes; the filling device comprises a filling rack, a membrane hanging rack and a zonal biomembrane strip; the biomembrane strip is hung on the membrane hanging rack; and the sludge discharge device comprises a sludge discharge main pipe and six sludge discharge branch pipes arranged in length alternation along radial direction. The anaerobic reactor has the characteristics of reasonable water distribution, compact structure and stable operation of the reactor.
Owner:WELLE ENVIRONMENTAL GRP CO LTD

Pulsed tube bundle heat exchange assembly and fused salt heat storage tank thereof

The invention provides a pulsed tube bundle heat exchange assembly and a fused salt heat storage tank thereof. The pulsed tube bundle heat exchange assembly comprises coiled tubes, an inlet vertical tube and an outlet vertical tube. The multiple coiled tubes are arranged. Each coiled tube comprises multiple arc heat exchange tubes. The ends of the adjacent heat exchange tubes are communicated, andthe multiple heat exchange tubes form a series-connection structure. A heat exchange tube free end is formed at the end of each heat exchange tube. The inlet vertical tube is connected with an inletof the first heat exchange tube, and the outlet vertical tube is connected with an outlet of the last heat exchange tube. The inlet vertical tube is connected with the inlet of the first heat exchangetub through a pulsed tube. An inlet of the inlet vertical tube is connected with a pulsating flow generation device. The pulsating flow generation device is used for generating pulsating flow in theheat exchange tubes. Pulsating flow is designed in the heat exchange tubes, the heat exchange efficiency can be further improved, the convection heat transfer process outside and inside the tubes canbe enhanced, the time needed for fused salt heat storage can be shortened, and meanwhile the effect of descaling in the tubes can be achieved.
Owner:SHANDONG UNIV

Elliptical tube H-shaped fin heat exchanger for waste heat recovery

ActiveCN103438746AIncrease disturbanceIncrease the thermal resistance of heat transfer, reduce the wake zone" enhanced heat transfer principleTubular elementsParticle adhesionWaste heat recovery unit
The invention discloses an elliptical tube H-shaped fin heat exchanger for waste heat recovery. The elliptical tube H-shaped fin heat exchanger comprises an elliptical heat exchange tube, a plurality of groups of H-shaped fins and a heat exchanger surface, wherein the H-shaped fins are sleeved on the surface of the heat exchange tube; the heat exchanger surface consists of non-uniform triangular small wings, which are elliptically arranged, on the surfaces of the H-shaped fins around the elliptical heat exchange tube. When dusty flue gas flows through the surfaces of the H-shaped fins, the small wings disturb the fluid to enhance the heat exchange on the tube wall and the downstream side, and meanwhile, the deposition of particles on the tube wall is reduced; the pressure drop can be reduced by the elliptical tube while the particle adhesion is reduced. A plurality of longitudinal vortexes are arranged in a non-uniform manner; at the front and rear edges of the wing, the size of the small wings and the windward attack angle are larger; on the middle parts of the H-shaped fins, the size of the small wings and the attack angle are smaller; by using the device, the heat exchange surface in different flow states can be enhanced respectively, the heat exchange of the fins are effectively enhanced, the pressure drop is reduced, and the deposition of dust particles in the flue gas on the heat exchange surface is reduced, so that the heat exchanger can operate efficiently for a long time in the dusty flue gas.
Owner:XI AN JIAOTONG UNIV

Sodium sulfide evaporation concentration system and method

The invention discloses an alkali sulphide evaporation concentration system and a method thereof. The system includes a preheater, a compound evaporator, a middle finished product tank, a single effect condensation water preheater, a single effect evaporator, a middle storing tank and a finished product storing tank; a pre-evaporating apparatus is set between the preheater and the compound evaporator, the pre-evaporating apparatus is composed of one preseparator and two alternative pre-evaporator, the pre-evaporator and the compound evaporator are communicated circularly, the pre-evaporator communicates with first high pressure steam. A stock solution heat exchanger and a stock solution flash drum are connected between the pre-evaporator apparatus; another part of the stock solution heat exchanger communicates with a filtering solution storing tank and the compound evaporator. Stock solution forms most scale formation after passing through the pre-separator and the pre-evaporator, then enters into the compound evaporator for evaporating after precipitating, filtering, clarifying and heat exchanging; therefore, the compound evaporator has little scale formation, and period of stopping for scale removal is delayed from 1-4 weeks to after one year.
Owner:SHIJIAZHUANG GONGDA CHEM EQUIP

Low-energy-consumption electrochemical treatment device and method for degradation-resistant organic wastewater

The invention relates to an electrochemical treatment device and method for degradation-resistant organic wastewater, and designs a'zero polar distance' SPE (Solid Polymer Electrolysis) electrooxidation sewage treatment electrolytic bath like a solid polymer electrolyte fuel cell technology. According to the device, an anode chamber and a cathode chamber are separated by utilizing an ion exchange membrane, the anode with stable titanium-based size, the ion exchange membrane and the nickel cathode are pressed by utilizing an end plate, and a'zero polar distance' SPE electrooxidation sewage treatment electrolytic bath is formed. When the device is subjected to electrolytic operation, the wastewater is electrically oxidized at the anode, so that organic matters and ammonia nitrogen in the water are mineralized and degraded; and running water or the wastewater is introduced into the cathode chamber, and hydrogen separated out due to electrolysis at the cathode is recovered. The device has the advantages that extra supporting electrolyte is not needed to be added, the bath pressure and energy consumption of electrooxidation can be greatly reduced due to the'zero polar distance', and the problem that oxygen (chlorine) and hydrogen separated out in the electrolysis process is solved. In addition, a carbon material is not used, reduction of current efficiency caused by carbon corrosion is avoided, and the reliability and stability of the sewage treatment device are improved. Moreover, continuous water flow is utilized at the cathode, and the scaling and plugging possibility on the cathode side of the ion exchange membrane can be greatly reduced.
Owner:BEIJING JINDAYU ENVIRONMENT TECH CO LTD

Baffled regulable ultrasonic/ultraviolet combined disinfection reactor

The invention provides a baffled regulable ultrasonic/ultraviolet combined disinfection reactor, belonging to the field of sewage and sludge treatment. The device utilizes ultrasonic and ultraviolet combined action, and by utilizing the crushing, cavitation and mechanical shearing action of ultrasonic wave, the particle size distribution state of particulate matters in sewage can be improved, the ultraviolet is forced to kill pathogenic bacteria, so that the ultraviolet disinfection efficiency and stability can be improved. The contact time of water flow and a disinfectant can be prolonged as water flow is baffled to pass through all reaction chambers of the reactor, multistage reaction processes can be formed, and the controllability of reaction processes can be enhanced. Through the technology, the side product risk brought by the disinfection of chemical medicaments can be greatly lowered, the baffled regulable ultrasonic/ultraviolet combined disinfection reactor is especially applicable to disinfection treatment of small and middle-sized sewage treatment plants, the technical operation is simple, auxiliary equipment facilities are not required, so that the baffled regulable ultrasonic/ultraviolet combined disinfection reactor is safe and high-efficiency.
Owner:UNIV OF SCI & TECH BEIJING

Zinc oxide desulphurization system

The invention discloses a zinc oxide desulphurization system comprising an absorption tower, a settling tank, a slurrying tank, an acidifying tank and a sulfur dioxide desorption tower, wherein the absorption tower is provided with an air inlet, an air outlet, an absorption liquid inlet and an absorption liquid outlet; the settling tank is communicated with the absorption liquid outlet; the slurrying tank is communicated with the settling tank, so that absorbent and supernatant liquor are sent to the absorption tower after being stirred; the acidifying tank is connected with a solid-contained slurry outlet of the settling tank; and the sulfur dioxide desorption tower is connected with the acidifying tank. According to the zinc oxide desulphurization system, by the control on the solid content and the pH value of the absorption liquid in the absorption tower, the problems of equipment blockage and scaling are obviously reduced and the absorption efficiency of SO2 is not influenced. In addition, without the discharge of any waste gas, waste liquid and waste solid, fully-closed operation is achieved. The equipment is simple, the operation and the maintenance are convenient and the cost is low; and compared with the traditional zinc oxide desulphurization, the zinc oxide desulphurization of the invention is short in process, convenient to operate and capable of realizing continuous operation.
Owner:CHINA ENFI ENGINEERING CORPORATION

Negative plate, preparation method thereof and lithium ion battery

ActiveCN110911637APrevent edge leakagePrevent thick edges from bulgingNegative electrodesSecondary cellsBattery cellFilm-coated tablet
The invention discloses a negative plate, a preparation method thereof and a lithium ion battery. The negative plate comprises a negative current collector. The negative current collector is coated with negative slurry to form a negative film coating area. At least one side edge of the negative film coating area is coated with insulating slurry to form an insulating film coating area, and the insulating film coating area and the negative film coating area are adjacent or partially miscible. A negative electrode blank area for forming a negative electrode lug is reserved on the edge of one side, far away from the negative electrode coating area, of the insulating coating area. The insulating coating area is positioned at the root of the negative electrode lug. According to the invention, the insulating coating area is additionally arranged on the edge of the cathode coating area, the foil leakage or thick edge bulging of the edge of the negative plate can be prevented. Moreover, the rigidity of the root part of the negative tab can be enhanced, the negative electrode lug is prevented from wrinkling and collapsing, the potential lithium precipitation risk of the battery due to the fact that the negative electrode lug is folded and inversely inserted into the battery cell to be covered with a negative material is avoided, the operability of the process is improved during electrodelug forming, winding or lamination assembly, the defects are reduced, and the production yield and the production efficiency are improved.
Owner:JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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