55results about How to "Precipitation is effective" patented technology

The invention belongs to the field of titanium-based alloys, and particularly relates to a novel heat-resisting titanium alloy and a processing and manufacturing method and application thereof. The processing and manufacturing method comprises the composition elements of alloy components, smelting, heat processing, heat treatment and the like, wherein the alloy components are as follows (in percentage by weight): 5.4%-6.3% of Al, 3.0%-5.0% of Sn, 2.5%-6.4% of Zr, 0.0%-0.96% of Mo, 0.25%-0.5% of Si, 0.2%-0.5% of Nb, 0.3%-3.4% of Ta, 0.2%-1.6% of W, 0.0%-0.07% of C, less than or equal to 0.17% of O, less than or equal to 0.03% of Fe and the balance of Ti and inevitable impurity elements. The novel heat-resisting titanium alloy disclosed by the invention can obtain different matching of tensile strength, plasticity, permanence, creep strength and heat stability through the combination of different heat processing process and heat treatment processes, can be used for manufacturing parts, namely blades, coil assemblies and the like which are positioned on the high-temperature parts of an advanced aircraft engine, is used for a long time within a range of 600-650 DEG C, can also be used for manufacturing high temperature-resistant structural members, namely aerospace craft skin and the like, is used for a short time at about 700 DEG C and can be used as a material and the like used for high temperature-resistant corrosion-resistant valves of an automobile and a boiler.

The invention discloses a human cytomegalovirus immunoglobulin for intravenous injection and a preparation method thereof, and aims to improve the purity, yield and safety of the product. In the invention, the specific activity of the human cytomegalovirus immunoglobulin for intravenous injection is not less than 2.5 PEI-U / mg, the anti-CMV titer is not less than 100 PEI-U / ml, the purity is greater than 98.2%, and the protein content is 51-55 mg / ml. Caprylic acid precipitation and anion exchange chromatography are used instead of the partial ethanol precipitation step in the traditional low-temperature ethanol method, thereby keeping IgG in the supernate all the time so as to keep the IgG activity; and processes of caprylic acid virus inactivation and nano film virus removal are used, thereby effectively ensuring the safety of the product. Researches show that the preparation method disclosed by the invention improves the purity, yield and safety of the product, saves the energy and reduces the production cost.

The invention discloses a waste water processing method during a heavy metal compound production process, and specifically relates to a waste water processing method during a lithium ion battery cathode material producing process. According to the invention, a precipitating agent and a flocculating agent are added into heavy metal compound production waste water; the mixture is filtered and separated, such that heavy metal precipitate and a high-concentration salt solution are obtained; the high-concentration salt solution is processed through multiple-effect evaporation, condensation, and separation, such that inorganic salt crystals can be obtained; and residue waste water can be discharged into a city sewage processing system. With the method, heavy metal ions can be effectively precipitated and recovered, and ammonia nitrogen and other high-concentration salt ions can be removed and recovered. The method is simple, and the cost is low. With the method, waste water can satisfy a standard for being discharged into the city sewage processing system.

The invention relates to a modified section cleaning device. The modified section cleaning device comprises brackets, a transmission roller way, a cover body, a burr cleaning mechanism, a cleaning mechanism and a drying mechanism, wherein the transmission roller way is embedded on the brackets; a plurality of transmission rollers are distributed in the transmission roller way, and the cover body covers the transmission roller way; a burr cleaning cavity, a cleaning cavity and a drying cavity are separately formed in the cover body from the input end to the output end, and the burr cleaning mechanism is arranged in the burr cleaning cavity; the burr cleaning mechanism comprises an upper brush roller, a lower brush roller, and a group of side brush rollers symmetrically arranged relative to the transmission roller way; the lower brush roller is embedded in the middle of the transmission roller way, and the upper brush roller with adjustable height is arranged right above the lower brush roller; the side brush rollers are arranged on a pedestal at the side end of the transmission roller way, a dust sucking device communicates with the top of the burr cleaning cavity, and the cleaning mechanism is arranged in the cleaning cavity; and the drying mechanism is arranged in the drying cavity. The modified section cleaning device disclosed by the invention is simple in structure, can be adaptive to cleaning operation of the surfaces of sections with different dimensions, and is simple in structure and high in working efficiency.

The invention belongs to the field of Ti-Al intermetallic compounds, and in particular relates to a cast toughened Ti3Al intermetallic compound as well as a preparation method and application thereof. The cast toughened Ti3Al intermetallic compound comprises constitution factors such as alloy components, smelting, precise casting and thermal treatment. The alloy components comprise 10.2-11.8 percent by weight of Al, 26.0-29.0 percent by weight of Nb, 1.0-3.0 percent by weight of Mo, and the balance of Ti and inevitable impurity elements, wherein the inevitable impurity elements comprise Fe, Si, O, N and H; Fe is less than or equal to 0.3%; Si is less than or equal to 0.3%, O is less than or equal to 0.15%; N is less than or equal to 0.04%; and H is less than or equal to 0.01%. Therefore, with the combination of the component optimization process and the thermal treatment processes, different matches between tensile strength and plasticity and between fatigue strength and thermal stability can be achieved, and the compound can be also used for manufacturing precise cast parts such as high-temperature parts of aero-engines, and can be used for a long time at 600-700 DEG C; and the alloy can be also used for manufacturing high-temperature resistant structural parts of aerospace crafts, and can be used for a short time at 650-750 DEG C.

The invention relates to the field of building construction, and discloses a super pressure and suction combined well point dewatering construction method of a deep foundation pit of a metro. The method comprises: (1) staking out in survey; (2) middle measurement and leveling; (3) hole drilling; (4) a well descending pipe and water filter pipe; (5) filling back gravels; (6) well sealing: cement paste is injected in a well through a grouting pipe; (7) well washing: compressed air is introduced to the lower portion of a drainage pipe by an air compressor through an intake pipe, so that mud outside the drainage pipe flows into the drainage pipe under the effect of an internal and external pressure difference of the drainage pipe and is taken outside the well by the drainage pipe; and when water drained from the drainage pipe meets designed well washing quality requirements, well washing is finished; (8) trial water pumping: a pump is put in for trial pumping, and the well completion is finished if the trial pumping is successful; and (9) formal dewatering: the water in a dewatering well is pumped into a drainage ditch of the top of the foundation pit by a super pressure and suction combined water pumping system. The method realizes quick and effective dewatering of the deep foundation pit so as to meet the dewatering demand in the deep foundation pit engineering.

The invention discloses a method for extracting super oxide mutase from red blood cells, which comprises the following procedures: carrying out anti-coagulation treatment for fresh animal blood, collecting in a centrifugal way red blood cells, haemolyting, thermal modifying, settling by stages through acetone, freezing dry to get crude SOD, separating the crude SOD by ion exchanging separation and / or molecular sieve separation to get refined SOD. The invention has completely eliminates chloroform alcohol, just uses thermal modification and stage-by-stage settlement through acetone to separate crude SOD with high activity. The method can maintain to the max. extent the original SOD activity, and the yield rate is higher than prior chloroform alcohol method. The invention is easy to operate and is applicable for industrialized production.

The invention relates to the technical field of a skin care product, in particular to anti-oxidation moisture preserving essence and a preparation method thereof. The anti-oxidation moisture preserving essence is prepared from the following raw materials in parts by weight: water, humectants, sea grape extracts, disodium ethylene diamine tetraacetate, tocopheryl acetate moisturizing soothing agents, suspending agents, emollients, preservatives, essence, selaginella tamariscina extracts, nicotinamide and honey. The anti-oxidation moisture preserving essence obtained through preparation has the advantages that uniform oil bead molecules are contained in a waterborne system; the moisturizing effect is good; the moisture retention effect is prominent; the long-acting moisture preserving performance is excellent; meanwhile, the anti-oxidation function is realized; the moisturizing is realized, meanwhile, the moisture is fast supplemented, and the generation of free radicals is prevented, so that the skin is smooth, tender, healthy and elastic.

The invention relates to a combined type artificial wetland sewage treatment system, which comprises a bar screen, an aeration water-collecting tank, a sedimentation tank and an artificial wetland connected in turn, wherein the bottom of the aeration water-collecting tank is provided with an aerator for aeration in the tank; the bottom of the sedimentation tank can be connected with a sludge pump; a discharge pipeline of the sludge pump is connected with a sludge concentration tank; and the artificial wetland adopts a horizontal baffling structure, and the water outlet is provided with a water storage tank. Because the aerator is arranged in the water-collecting tank to form the aeration water-collecting tank, the aeration and aerobic biochemical treatments are performed while collecting water, which reduces the pollutant content in the sewage, is helpful to the subsequent sludge sedimentation in the sedimentation tank to separate out the sludge in the sewage effectively, and simultaneously saves the space and equipment, and avoids fermentation and peculiar smell in the process of collecting water; and because the artificial wetland adopts the horizontal baffling structure, the processing effect is improved. The combined type artificial wetland sewage treatment system can treat the sewage with higher concentration and has lower pretreatment cost.

The invention discloses a treating method for industrial waste water. The treating method includes the steps that firstly, a heavy metal precipitating agent is input into industrial waste water and placed for 1-5 hours; secondly, the industrial waste water treated in the first step is filtered through a filtering net, and the treated industrial waste water is obtained, wherein the heavy metal precipitating agent comprises sodium hydroxide, potassium hydroxide, sodium carbonate, magnesium carbonate, activated carbon and nanometer calcium oxide. Relative to the sodium hydroxide of 100 weight parts, the content of the potassium hydroxide is 30-70 weight parts, the content of the sodium carbonate is 10-50 weight parts, the content of the magnesium carbonate is 1-30 weight parts, the content of the activated carbon is 1-10 weight parts, and the content of the nanometer calcium oxide is 1-10 weight parts. By means of the technical scheme, toxic and harmful substances in the treated industrial waste water are greatly reduced, and the water quality is greatly improved.

The invention provides sand prevention and water reduction proppant particles and a preparing method thereof. The sand prevention and water reduction proppant particles comprise quartz sand core particles and resin coating films which cover the surfaces of the quartz sand core particles and are rich in portland cement clinker. The resin coating films rich in portland cement clinker are formed by mixing a mixture A with a resin solution. The mixture A contains portland cement clinker, and the mass ratio of quartz sand core particles to portland cement clinker to resin is (18-22) : (9-11) : (2-4). The sand prevention and water reduction proppant particles are a particle composite material which has high hydrophilia and can be consolidated, oil-water flow selective permeation is high, a water flow preferential migration passage is blocked by sand prevention and water reduction proppant particles in a proper particle size according to the size of a duct and the water outlet condition of an oil and gas well, water direction is changed, and then the water content of the oil and gas well is reduced.

The invention discloses an environment-friendly anti-blocking sewage treatment device. The device comprises a main filter box, a support column, a precipitation bin, a water inlet pipe, a connecting cylinder and a water outlet, wherein the bottom end of the main filtering box is connected with a supporting column; the top end of the main filter box is connected with a connecting cylinder; a connecting frame is connected to the inner wall, close to the bottom end, of the connecting cylinder, a first sleeve is connected to the center of the connecting frame, a connecting rod penetrates through the interior of the first sleeve, the surface of the top end of the connecting rod is sleeved with a propeller, a flow guide plate is connected to the center of the inner wall of the connecting cylinder, and an arc-shaped filter screen is fixed to the inner wall of the connecting cylinder. By arranging the precipitation bin and the inner bin, solid particles in the sewage can be effectively precipitated, the possibility that the interior of the device is blocked by the solid particles is reduced, and by arranging the stirring device, the connecting box and the filter plate, the sewage can be further filtered, so that the filtering effect of the device is improved.

The present invention relates to the technical field of rainwater collection devices, in particular to a rainwater collection device for preventing precipitation, which includes a box body, the fine filter plate is located on the lower side of the coarse filter plate, and a fixing plate is provided on the left side of the box body. The right side of the box body is provided with a discharge pipe corresponding to the push plate, the upper end of the cross bar is provided with a housing connected with the water outlet, and the left side of the housing is equipped with a second motor. The right side of the body is provided with an outlet, the second motor passes through the housing through the second rotating shaft and is connected with a second helical blade, and the first motor, the cylinder, the second motor, and the electromagnetic valve are all connected to an external control switch. Compared with the existing technical features, this device has great advantages, and effectively filters the internal garbage, and avoids the effect of anti-sedimentation, which brings a relatively good effect and removes the rainwater containing many minerals. Impurities avoid the problem of internal influence caused by long-term use, and it is worth promoting and using in the future.

The invention relates to a treatment equipment of wastewater produced from chromate treatment by using a coke-scrap iron method, wherein, a reaction device is essentially composed of a roller (6) which is placed in an incline way, bent plates (16), and a stirrer (10) and a drug tank (11) arranged on a settling water tank. A plurality of bent plates are arranged at the rims of the two sides of a neutralizing tank (21) in a tooth form; an aftertreatment device is provided with the settling tank, in which a plurality of transitional bins and filtration bins that are arranged crosswise and communicated are arranged, wherein, the neutralizing tank (21) that is communicated with a first transitional bin (15) is arranged in the first transitional bin (15) which is also provided with rough hole and pore foam board filtration devices (13) and double-inclined-tube settlers arranged in different filtration bins. The treatment equipment has novel design. The roller can lead the coke and the scrap iron to make free fall in the roller, thereby avoiding caking of the scrap iron; the economic and suitable double-inclined-tube settlers are used in the filtration bins; a rough hole and pore foam board design is used in the last purifying procedure; therefore, the final water quality requirements are guaranteed. The whole equipment can treat wastewater continuously.

The invention discloses a rainwater collection and treatment system for sponge city construction. The rainwater collection and treatment system for the sponge city construction comprises a rainwater collection device, a rainwater treatment device and an intelligent controller, staggered water collection pipes can realize rapid rainwater collection through arranging the rainwater collection device,and a precipitation layer can be arranged to precipitate larger impurities such as sand and stone contained in rainwater preliminarily; through arranging a filter tank in the rainwater treatment device, a double-layer filter layer can filter impurities such as fine particles, organic pollutants and the like contained in the rainwater effectively, and the rainwater is disinfected through a disinfection tank, so that the redistribution and utilization of water resources can be realized after the rainwater is detected to be qualified by a water quality detector; through configuring the intelligent controller, the tonnage of treatment water, the water quality detection data and the like of the rainwater collection and treatment system can be uploaded to a partition server in real time for intelligent control, a fault can be located and solved in time through an own positioning system, so the urban waterlogging problem is solved effectively.

The invention discloses a river and lake sediment heavy metal precipitation, solidification and foundation reinforcement test device, a detachable drainage plate is arranged in a transparent model tank, and the drainage plate divides the transparent model tank into a drainage chamber and a soil body treatment chamber; geotextile is arranged on the inner side surfaces of the drainage plates which are oppositely arranged; a PPR pipeline with an opening is detachably connected into the soil body treatment chamber; and an anode iron net and a cathode iron net are arranged in the soil body treatment chamber and close to the geotextile. The device is simple in structure, and can be used for realizing non-embedded continuous observation of the internal displacement and heavy metal migration process of the soil body and evaluating the treatment effect of the heavy metal pollutants in each stage of river and lake sediment heavy metal pollutant precipitation, in-situ solidification and foundation reinforcement combined treatment. The invention further provides a river and lake sediment heavy metal precipitation and solidification and foundation reinforcement test method. The foundation reinforcement effect is achieved while the removal efficiency of heavy metal in a soil body is greatly improved. The method is simple, effective and wide in applicability.

The invention discloses a sewage treatment device based on urban ecological environment treatment, which comprises a water storage tank, a water injection assembly, a sealing tank cover, a spraying assembly, a disinfection assembly, a water outlet tank, a graded water outlet plate and a water outlet pipe; the sealing tank cover is fixedly mounted in the center of the top end surface of the water storage tank; a spraying assembly is fixedly installed in the center of the top end face of the sealing box cover, a water injection assembly is fixedly installed on one side of the top end face of thewater storage box, a disinfection assembly is fixedly installed on one side of the end face of the water storage box, and a water outlet box is connected to one side of the exterior of the disinfection assembly; a plurality of graded water outlet plates are fixedly mounted in the water outlet tank, and a water outlet pipe is connected to the bottom of one end of the water outlet tank. According to the sewage treatment device based on urban ecological environment treatment, water storage is convenient, a large amount of sewage can be treated at a time, and the sewage treatment effect is good;the sewage can be effectively precipitated, filtered and disinfected; the sewage purification efficiency is effectively improved.

The invention relates to a high temperature-resistant nanosized self-adhesive optical protective film and a production method thereof. The self-adhesive optical protective film comprises a self-adhesive layer, an intermediate layer and an unwinding layer, wherein the self-adhesive layer comprises metallocene polyethylene elastomer resin, soft rubber resin and ternary polymerized polypropylene resin at a mass ratio of (70-80):(10-20):(5-15), the intermediate layer includes high-density polyethylene resin, linear low-density polyethylene resin and low-density polyethylene resin at a mass ratio of (25-35):(35-45):(25-40), and the unwinding layer includes block polypropylene resin and a fluorine-containing auxiliary agent at a mass ratio of (90-98):(2-10). The self-adhesive optical protectivefilm is produced in a multi-layer coextrusion tape-casting mode, and has the excellent properties of high temperature resistance, no shrinkage, repeated sticking and no precipitation.

The invention discloses a sedimentation tank for sewage treatment. The sedimentation tank comprises a sedimentation tank body, a mixing shell is arranged on the outer wall of one side of the sedimentation tank body, a feeding hopper is arranged on the outer wall of the top of the mixing shell, a discharging box of a conical structure is arranged on the inner wall of the top of the mixing shell, discharging openings which are evenly distributed are formed in the circumference of the outer wall of the top of the discharging box, and transition hoppers and flow guide plates are alternately connected to the inner wall of the circumference of the mixing shell through fastening bolts. Sewage to be treated is injected into the mixing shell through the feeding funnels; meanwhile, a chemical agentis injected into the discharging box, overflows from the discharging openings and is mixed with sewage, a mixture of the chemical agent and the sewage sequentially and alternately flows through the transition funnels and the flow guide plates, so that the chemical agent and the sewage are fully mixed, a conveying pump pumps the sewage mixture mixed at the bottom of the mixing shell and injects thesewage mixture into the feeding pipe to achieve feeding, and the function of effectively mixing the chemical agent and the sewage is achieved.

The invention discloses a refrigerator, comprising a refrigerator body, multiple shelves, a pesticide degrading device, and a water storing plate, wherein a compartment is defined in the refrigerator body; multiple shelves are arranged in the compartment in the vertical direction at intervals for placing fruits and vegetables, multiple hollow parts arranged horizontally at intervals are formed on each of multiple shelves; the pesticide degrading device is arranged in the compartment and arranged above multiple shelves so as to dissolve the pesticide on the surface of fruits and vegetables out and make the pesticide fall down sequentially through multiple hollow parts of the shelves; the water storing plate is arranged on the bottom of the compartment so as to store the fallen pesticide. According to the refrigerator in the embodiment of the present invention, the degradation of pesticide has no bad effect on other food, and the refrigerator can treat a bulk of fruits and vegetables at a time, is convenient to use and has high pesticide precipitation rate, increases the food safety, causes no pickling phenomenon on the bottom of the fruits and vegetables and is favorable for the preservation of fruits and vegetables.

The invention discloses a high-water-cut oil well sand prevention and precipitation method, and belongs to the technical field of oil field oil extraction. According to the high-water-cut oil well sand prevention and precipitation method, a proper amount of sand prevention and precipitation particles are squeezed in firstly, then gravel filling sand prevention construction is conducted, the sand prevention and precipitation particles are solidified to form a blocking layer under the condition that an oil layer is not polluted, a large hole channel formed by injected water or edge and bottom water is blocked, and meanwhile gravel and a screen pipe form a high-flow-guide sand blocking belt. According to the method, a composite gravel filling mode is adopted, sand prevention and precipitation particles are combined with quartz sand used for mechanical sand prevention, the sand prevention and precipitation particles capable of being solidified are firstly filled to form an oil seepage and water blocking sand blocking barrier, and then multi-particle-size quartz sand is adopted for filling to form a high-permeability sand blocking barrier. According to the method, the advantages of two sand prevention technologies are integrated; and the double effects of effective precipitation and effective sand prevention are achieved, the purposes of sand prevention, precipitation and oil increase are achieved, and the production requirement of the high-water-cut period is met.

The invention provides a water quality processing system of a diversion and drainage river channel. The water quality processing system is arranged on the diversion and drainage river channel between an external water body and a receiving water body, and comprises a diversion and drainage unit, a natural settlement unit and an interception and filtration processing unit, wherein the diversion and drainage unit, the natural settlement unit and the interception and filtration processing unit are sequentially arranged in a water diversion direction. The diversion and drainage unit is arranged at a water diversion port and is provided with a two-way pump and sluice. The cross section of the natural settlement unit is wider than that of the diversion and drainage river channel and is longer than that of the interception and filtration processing unit, and a bottom surface of the natural settlement unit is lower than that of the diversion and drainage river channel. The interception and filtration processing unit comprises multiple interception and filtration processing devices with filtration stuffing inside; in the length direction of the diversion and drainage river channel, the interception and filtration processing devices are parallel; in the width direction of the diversion and drainage river channel, the interception and filtration processing devices are sequentially overlapped; in the depth direction of the diversion and drainage river channel, the interception and filtration processing devices are sequentially staggered. The system can be used for purifying and processing the introduced water body comprehensively in the length, width and depth directions of the diversion and drainage river channel in a three-dimensional manner and effectively purifies the introduced water body.

The invention relates to a balanced water distribution and clarification tank which comprises a backflow tank and a clean water tank, as well as a precipitation tank, wherein a water inlet is formed in one side of the backflow tank; the other side of the backflow tank is communicated with the clean water tank through a water outlet; the precipitation tank is communicated with the clean water tank through a filtration unit; a sewage pump is arranged at the bottom of the backflow tank; the sewage pump is communicated with the precipitation tank. A water body is filtered after being subjected to adsorption precipitation by using the backflow tank so as to be fed to the clean water tank, and after sludge precipitated in the backflow tank is subjected to precipitation filtration in the precipitation tank, moisture in the sludge is fed to the clean water tank, so that the effective precipitation and filtering of externally water are achieved, the reaction requirements of subsequent flocculation are met, and the improvement of water treatment efficiency and quality is facilitated, and water source is saved.

The invention discloses a precipitation method of a horizontal flow tank, which aims to improve the precipitation effect on the premise of not enlarging the volume of the horizontal flow tank. In the precipitation method, holes are perforated on a water inlet retaining wall of the horizontal flow tank to manufacture a screen wall; the bottom on the water inlet side of the horizontal flow tank is provided with a sloping plate which is placed behind the water inlet retaining wall in a sloping mode; the front end of the sloping plate is higher than the bottom of the tank and is abutted on the water inlet retaining wall, the back end of the sloping plate stuck on the bottom of the horizontal flow tank, and the whole sloping plate is paved in a sloping mode with a slop angle of 45 degrees; the middle part of the horizontal flow tank is provided with a flow retaining wall which is made of thick steel plates, two sides of the flow retaining wall are in suspending fixation on two side walls of the horizontal flow tank through channel steels; an inclined tube settler is arranged between the flow retaining wall and a water outlet retaining wall, and the inclined tube settler comprises a hexangular honeycomb packing and a steel frame; and the inside of the steel frame is uniformly divided into a plurality of partitions, and each partition is filled with the hexangular honeycomb packing respectively.

The invention provides a sludge scraping device for a sewage treatment sedimentation tank, and relates to the field of sewage treatment. Comprising a sedimentation tank, a water inlet and a water outlet are fixedly mounted at the left top end and the right top end of the sedimentation tank respectively, and a supporting plate is fixedly mounted at the top end of the sedimentation tank. According to the sludge scraping device for the sewage treatment sedimentation tank, by arranging a spring barrel, a buffer spring and a spring rod, when sludge settled on the inner bottom wall of the sedimentation tank is treated, the spring rod can extrude the buffer spring to buffer the resistance brought by the sludge to a fender, so that the fender can stably and continuously move, and a motor is prevented from being burnt out due to short circuit; the sludge treatment device has the advantages that the sludge treatment device is provided with the sludge discharge pipe, the sludge pump and the control valve, the loose sludge can be discharged from the sludge discharge pipe by starting the sludge pump, and the sludge in the sedimentation tank can be quickly pumped out, so that space can be reserved, and dirt carried by sewage can be effectively settled.

The invention discloses a heavy metal precipitator and a preparation method therefor and application thereof. The heavy metal precipitator comprises sodium hydroxide, nano calcium oxide, modified potassium hydroxide, dithiocarboxylic acid and nano sodium carbonate, wherein relative to 100 parts of sodium hydroxide, the content of nano calcium oxide is 1-10 parts by weight, the content of modified potassium hydroxide is 20-30 parts by weight, the content of dithiocarboxylic acid is 1-10 parts by weight and the content of nano sodium carbonate is 1-10 parts by weight. The heavy metal precipitator prepared by the method in actual use in heavy metal containing water can be used for effectively precipitating heavy metals in sewage so as to effectively improving the water quality of sewage, so that the pollution on a water body is greatly reduced.

The invention discloses mine water treatment plant for underground coal mine. The mine water treatment plant comprises a housing. Supporting legs are fixedly installed at corners of the bottom of thehousing. A blow-off pipe is fixedly installed at one side of the bottom of the housing, and a clear water drain pipe is fixedly mounted at the other side of the bottom of the housing. A first water suction pump is fixedly installed between the blow-off pipe and the clear water drain pipe at the bottom of the housing. A water inlet of the first water suction pump is fixedly equipped with a first pumping pipe, and a water outlet of the first water suction pump is fixedly provided with a first drainage pipe. A sewage inlet tank is fixedly installed at one side of the upper part of the housing. Anactive rotating shaft is movably installed at one side of the sewage inlet tank through a fixed mount. The mine water treatment plant for underground coal mine can directly filter out large chunks offoreign materials in sewage and also can realize the function of multistage sedimentation.

The invention discloses a crushing type concrete recycling device, and belongs to the field of concrete recycling. The crushing type concrete recycling device comprises a box body; limiting plates arerespectively and fixedly arranged at the top end and the bottom end of an inner cavity of the box body; the middle of the front surface on one side of the box body is provided with round holes; the middles of the back surfaces of the two sides of the box body are respectively provided with sliding grooves; rolling shafts are respectively and movably connected with the interiors of the two slidinggrooves and the interiors of the round holes in a sleeving mode; threaded holes are respectively formed in the middle of the back surfaces of inner cavities of the two sliding grooves; one ends of the two rolling shafts both penetrate through and extend to the outside of the box body and are respectively and fixedly connected with spur gears in a sleeving mode; external teeth of the two spur gears are engaged with each other; and two ends of one of the rolling shafts are respectively and movably connected with movable blocks positioned in the two sliding grooves in a sleeving mode. The crushing type concrete recycling device is simple in structure and convenient to use, can drop due to the movement of one crushing tool rest, and prevents a waste concrete grinding and recycling recovery device from being blocked.