59results about How to "Control concentration" patented technology

The invention discloses a ZnFeP-particle gradient abrasion-resistant chemical composite coating and a preparation method of the ZnFeP-particle gradient abrasion-resistant chemical composite coating. The ZnFeP-particle gradient abrasion-resistant chemical composite coating is divided into a passivation layer, a low-iron ZnFeP-particle chemical composite coating and a high-iron ZnFeP-particle chemical composite coating from outside to inside, and a gradient coating with the corrosion potential from low to high is formed; the content of iron in the low-iron ZnFeP-particle chemical composite coating ranges from 0.03 wt% to 1.0 wt%, the thickness of the low-iron ZnFeP-particle chemical composite coating ranges from 8 micrometers to 18 micrometers, and the hardness of the low-iron ZnFeP-particle chemical composite coating ranges from 150 HV to 300 HV. The content of iron in the high-iron ZnFeP-particle chemical composite coating ranges from 5 wt% to 30 wt%, the thickness ranges from 8 micrometers to 18 micrometers, and the hardness ranges from 500 HV to 650 HV. By means of the ZnFeP-particle gradient abrasion-resistant chemical composite coating, a metal component can be resistant to abrasion and corrosion, and therefore the service capacity of the metal component such as electric power fittings in the abrasion working condition is obviously improved.

The utility model provides a cutting fluid supply system of a numerical control machining center. The cutting fluid supply system comprises a cutting fluid supplementing system, a precipitation water tank, a machine tool fluid supply system, a cooling system, a filtering system, a backflushing system and a control system. And the cutting fluid supplementing system conveys the stock solution in the raw material barrel to the stock solution box, and supplements the stock solution to the precipitation water tank through the proportional liquid preparation pump and the liquid supplementing pipeline. And the cooling system cools the cutting fluid in the precipitation water tank through a water cooler and a heat exchanger. And the filtering system comprises a back-flushing scraper chip cleaner and a cloth bag filter and is used for filtering and purifying the cutting fluid. And the backflushing system is used for cleaning a backflushing filtering roller through a backflushing pump. And the machine tool liquid supply system conveys the cooled and filtered cutting liquid to a machine tool liquid supply pipeline. According to the utility model, all the systems are matched and linked, so that the full-automatic operation of conveying, distributing, replacing, filtering and recycling cutting fluid and cleaning the filter screen is realized, the labor intensity is reduced, the labor cost is saved, and the cutting fluid utilization rate and the machining efficiency of a machine tool are improved.

The invention discloses a refractory COD emergency treatment adding device and a control method, and relates to the technical field of wastewater treatment in environmental protection engineering, the refractory COD emergency treatment adding device comprises a stock bin used for storing activated carbon, the stock bin is provided with a feeding pipeline used for conveying the activated carbon to the stock bin, and a feeding electric valve is arranged at the bottom of the stock bin; the weighing mechanism is used for weighing the activated carbon and comprises a hopper and a weighing sensor, the hopper is supported on the weighing sensor and located at the bottom of the stock bin, the hopper is connected with a feeding electric valve of the stock bin, the stirring device is connected with the hopper, and the stirring device is used for receiving the weighed activated carbon and quantitatively adding water for stirring; the conveying device is connected with the stirring device and used for conveying the stirred activated carbon aqueous solution into the COD treatment system, the adding amount of the activated carbon is accurate, the activated carbon is uniformly dispersed after being stirred, and the wastewater treatment effect of the COD treatment system can be improved.

The invention discloses a pulse dynamic electrochemical mechanical composite polishing method which comprises the following steps: step 1, preparing a polishing medium with an electrochemical thickening effect, the polishing medium being formed by mixing a dispersion medium, a dispersion phase, an electrolyte, an additive and an abrasive; secondly, a polishing medium is placed in a polishing groove, and a workpiece is fixed to a connecting shaft of a polishing device through a pneumatic clamp; thirdly, the positive electrode of a pulse power source is connected with the connecting shaft through a wire, and the negative electrode of the pulse power source is connected with the polishing groove through a wire; fourthly, a multi-dimensional coupling vibration device is fixedly connected with the polishing groove through an insulation connecting body, and the vibration frequency, the vibration amplitude, the voltage, the duty ratio and the frequency of a pulse power source are set; and fifthly, the polishing medium is subjected to the directional vibration effect of the multi-dimensional coupling vibration device. By setting a programmable vibration direction, a polishing medium is directionally induced to generate a shear thickening effect and an electrochemical oxidation effect on the surface of a specific workpiece, so that localized removal of a material is realized.

The invention discloses an automatic dosing device and method for circulating water. The automatic dosing device comprises a box body, and an automatic quantitative dosing mechanism for quantitatively dosing into the box body is arranged at the top of the box body; and the automatic quantitative chemical adding mechanism comprises a round box fixed to the top of the box body, the top of the round box communicates with a hopper, a mounting cylinder is fixed to the top wall of the round box, a rotating cylinder is rotationally connected to the interior of the mounting cylinder, and a connecting column is fixed to the bottom of the rotating cylinder. According to the circulating water automatic dosing device and method, through the arrangement of the automatic quantitative dosing mechanism, automatic quantitative dosing of medicine powder is achieved, one-time quantitative medicine adding is completed by rotating a cam by a circle and pressing a sleeve once, medicine added every time is quantified, and therefore the concentration of medicine in water is well controlled; the phenomena of medicine waste and poor purification effect due to too little medicine are avoided.

The invention provides mixing equipment for disinfectant production, and relates to the technical field of disinfectant preparation, the mixing equipment comprises a reaction tank and a partition plate; a partition plate is arranged in the reaction tank, a material leakage opening is formed in the partition plate, a threaded rod is rotatably connected to the interior of the reaction tank, a sealing sleeve is connected to the threaded rod through threads, a connecting baffle is slidably connected to the interior of the sealing sleeve, a connecting sleeve is rotatably connected to the connecting baffle, and a material receiving opening corresponding to the material leakage opening is formed in the connecting baffle; the connecting sleeve is fixedly connected with a partition check block capable of partitioning the material receiving port, a connecting rod is fixedly connected in the reaction tank, the connecting rod is in sliding connection with the connecting sleeve, the sealing sleeve and the connecting baffle, a first discharging hole is formed in the sealing sleeve, and a second discharging hole is formed in the connecting sleeve. According to the application, the loss of silver ions in the filtering process of the silver phosphate precipitate can be reduced.

The utility model relates to the technical field of water cups, and particularly discloses a connecting rod type stroke amplification mechanism for a cup cover, the cup cover and a tea making cup, the connecting rod type stroke amplification mechanism comprises a cup cover base and a traction belt, a stroke amplification assembly and a driving assembly are installed on the cup cover base, and the stroke amplification assembly comprises a connecting rod structure; the traction belt is arranged on the connecting rod structure in a penetrating mode, the driving assembly drives the connecting rod structure to move so as to drive the traction belt to conduct stroke amplification motion, and the input stroke of the driving assembly to the connecting rod structure is smaller than the output stroke of the traction belt. The tea making cup has the advantages that the tea water concentration is controlled, and meanwhile the use convenience of the tea making cup is improved.

The invention discloses an epitaxial structure, a preparation method thereof and a light-emitting diode, and belongs to the technical field of semiconductors. The epitaxial structure comprises a substrate, a light-emitting layer formed on the substrate, an N-type current expansion layer and a P-type current expansion layer which are formed on the two sides of the light-emitting layer, and an electron blocking layer formed between the light-emitting layer and the P-type current expansion layer. Wherein the light-emitting layer comprises at least one pair of quantum well layer In < x > Ga < 1-x > N and quantum barrier layer In < y > Ga < 1-y > N, and y < lt > is greater than or equal to 0; x < 1. The material components of the quantum well layer InxGa1-xN and the quantum barrier layer InyGa1-yN both comprise indium, gallium and nitrogen, so that lattice mismatch is reduced, compression stress caused by lattice mismatch is reduced, the piezoelectric polarization effect is weakened, meanwhile, the recombination efficiency of current carriers is improved, the external quantum efficiency is improved, and the performance of the light emitting diode is improved.

A novel teacup allowing a user to autonomously control the concentration of tea soup comprises a bottle body and a bottle cap, a detachable filter screen is arranged in the bottle cap, and a tea containing chamber is formed by the filter screen, the side wall of the bottle cap and the top of the bottle cap; bottle body threads are tapped on the outer side of the top of the side wall of the bottle body, first threads corresponding to the bottle body threads are tapped on the lower portion of the inner wall of the bottle cap, and when the bottle cap covers the bottle body, the bottle body threads are connected with the first threads in a matched mode. The outer wall of the filter screen is provided with filter screen threads, the inner wall of the bottle cap above the first threads is provided with second threads corresponding to the filter screen threads, and the filter screen is connected with the bottle cap through matching of the filter screen threads and the second threads.

The invention belongs to the technical field of air purification, and particularly relates to an activated carbon adsorbent with ultra-high molecular weight polyethylene fibers as a framework and a preparation method of the activated carbon adsorbent. The activated carbon adsorbent is of a porous sheet structure and comprises 85-95 wt% of activated carbon powder, 1-10 wt% of a polymer and 0.2-3.0 wt% of an auxiliary agent, wherein the polymer is ultra-high molecular weight polyethylene or a mixture of ultra-high molecular weight polyethylene and high-density polyethylene; the polymer presents a cross network skeleton structure in a fibrous form, and the active carbon powder and the auxiliary agent are attached to the polymer fiber. The activated carbon adsorbent has the advantages of extremely low dust capacity in the use process, high content of effective components, small bed resistance, high harmful gas adsorption rate and the like.

The utility model relates to the technical field of quantitative bottle caps, in particular to a coffee quantitative bottle cap which comprises a shell cover and a shell which are in running fit, the side, away from the shell cover, of the shell is detachably fixed to a containing bottle, a containing cylinder is arranged between the shell cover and the shell, the containing cylinder is fixed to the shell, and the containing cylinder is connected with the shell. A containing cylinder is arranged in the shell cover, a quantitative cavity is formed in the containing cylinder, a discharging port is formed in the shell cover, a feeding port is formed in the shell, the quantitative cavity can be communicated with the feeding port or the discharging port, and the quantitative cavity cannot be communicated with the feeding port and the discharging port at the same time. The coffee machine has the advantages that quantitative taking of coffee powder is achieved, and therefore the purpose of controlling the concentration of brewed coffee is achieved.

The invention discloses a mica paper pulp quality control method based on image recognition, a medium and a system, and relates to the field of image recognition, and the method comprises the following steps: obtaining a target area image of mica paper pulp through operation of a vibrator at the bottom of a mica paper pulp pool, and carrying out image recognition on the target area image to obtain vibration ripple characteristics of the target area image; determining a first concentration range of mica paper pulp according to the vibration ripple characteristics of the target area image; incident light is emitted to a target area; acquiring a current image of the target area; determining the number of scales on the surface of the mica paper pulp through the current image; determining a second concentration range of the mica paper pulp according to the scale number on the surface of the mica paper pulp; and determining a final concentration range of the mica paper pulp by combining the first concentration range and the second concentration range of the mica paper pulp so as to generate a quality control strategy according to the final concentration range. The mica paper pulp quality control method can effectively improve the accuracy of mica paper pulp quality control.

The invention provides a stomach-strengthening and digestion-promoting oral gel and a preparation method thereof, and relates to the field of medical technology. The stomach-strengthening and digestion-promoting oral gel of the invention comprises components by weight fraction: 0.5-2% compound glue, 0.05-0.2% potassium chloride, 5-20% sucrose, 0.05-0.25% citric acid, 0.025-0.075% antibacterial agent, 2.5-4% fruit powder and 73.475-91.875% liquid; in the liquid, the concentration of the Chinese medicine extract is 0.19-0.51g crude drug / mL; in the compound glue, the mass ratio of carrageenan, locust bean gum and xanthan gum is 1-5:0.3-3:0.5-2.5; the prepared stomach-strengthening and digestion-promoting oral gel has moderate elasticity and hardness, is convenient to chew, has a good taste, can meet the needs of different groups of people, improve the compliance of people with chewing and swallowing difficulties, can also significantly reduce the relative residual rate of pigment in the stomach, and significantly accelerate the pigment propulsion movement in the small intestine.

The invention relates to the technical field of reaction kettles, and particularly discloses a high-pressure polymerization reaction kettle which comprises a base and a reaction kettle body, a constant-proportion material preparation mechanism is arranged in the reaction kettle body, the constant-proportion material preparation mechanism comprises a driving motor, and by arranging the constant-proportion material preparation mechanism, the constant-proportion material is prepared by utilizing the driving force of the driving motor. The linkage transmission operation of the chain driving assembly and the transmission assembly is matched, the quantitative feeding unit is driven to achieve fixed-ratio feeding of materials in the stirring tank every time, and meanwhile the raw material lifting assembly achieves lifting feeding operation of raw materials; therefore, synchronous integrated operation of continuous feeding operation of the materials, quantitative storage of the materials, quantitative proportioning operation of the materials and mixing and stirring operation of the polymers is realized, so that the efficiency of raw material preparation operation before chemical polymer preparation is effectively improved, and the concentration of the raw materials is controlled; therefore, the subsequent chemical synthesis reaction is more complete.

The application discloses a pulse joule heat method for lithium-zinc ferrite post-treatment and wave absorption application, and the pulse joule heat method comprises the following steps: a pre-sintered lithium-zinc ferrite material is prepared by using a sintering furnace method; the pre-sintered lithium-zinc ferrite material is wrapped with carbon cloth and clamped between two electrodes of a joule heating device, then direct current is inputted to generate joule heat; in a vacuum environment, the heating temperature is controlled by adjusting the current parameters, and the heating time is controlled by adjusting the current time, so that the lithium-zinc ferrite material is rapidly post-treated. By introducing the pulse joule heating method, the lithium-zinc ferrite material can be rapidly heat-treated in a very short time, the effective regulation of the defect concentration and the electronic structure is realized, and thus the inherent parameters of the lithium-zinc ferrite are effectively improved and the wave absorption performance is improved.

The present application relates to a sintered grinding wheel grinding surface morphology simulation control method, device, equipment and medium, the method comprising: according to the external vertices of random abrasive particles located in the circumference of the first retained abrasive particles, the volume of the convex polyhedron of the random abrasive particles is calculated and determined, and the random abrasive particles are determined as interference abrasive particles and removed according to the volume of the convex polyhedron to determine the second retained abrasive particles in the binder unit; according to the multiple first vertices of the random abrasive particles in the circumference of the second retained abrasive particles, the multiple second vertices of the second retained abrasive particles in the circumference of the random abrasive particles, and the characteristic surfaces constructed by the multiple characteristic vertices and the second vertices, the random abrasive particles are determined as interference abrasive particles and removed to determine the third retained abrasive particles in the binder unit, to determine multiple sintered grinding wheel unit cells of different grinding wheel concentrations, and to construct a sintered grinding wheel of target grinding wheel concentration using multiple sintered grinding wheel unit cells of different grinding wheel concentrations for simulation. The present application greatly improves the accuracy of the sintered grinding wheel.

The invention discloses a preparation method of a biological selective porous iron-sulfur autotrophic denitrification filler. The preparation method comprises the following steps: respectively grinding pyrite and sulfur in a sampling machine to-74 microns, and then carrying out ball milling; carrying out aerobic biological activation on the ball-milled pyrite powder in a 9K basic culture medium, and then carrying out solid-liquid separation to obtain aerobic activated ore; after a fresh culture medium is replaced, sulfur is added, nitrogen is used for blowing air to conduct anaerobic biological activation, then solid-liquid separation is conducted, and anaerobic activated ore is obtained; and cleaning the surface of the obtained anaerobic activated ore with diluted hydrochloric acid, mixing with sodium bicarbonate and activated carbon, ball-milling, pelletizing and sintering at low temperature to obtain the biological selective porous iron-sulfur autotrophic denitrification filler. According to the preparation method of the biological selective porous iron-sulfur autotrophic denitrification filler, the raw materials are wide in source and low in cost, adsorption growth of iron-sulfur autotrophic microorganisms can be selectively promoted, and the ideal effects of advanced sewage treatment and nitrogen and phosphorus removal can be achieved.

The application discloses a reagent for overcoming distant hybridization incompatibility of plants in the Rutaceae family and a use method thereof. 2+ The reagent is EDTA or EGTA solution which is sprayed on the stigma of the plants in the Rutaceae family, so that the Ca content of the stigma of the plants in the Rutaceae family during the flowering period is effectively reduced, and the distant hybridization incompatibility between the Citrus grandis and the Clausena lansium is overcome. The reagent has little harm to the plants, has remarkable effect in overcoming the distant hybridization incompatibility, has wide application range, can be further used for overcoming the distant hybridization incompatibility of other plants in the Rutaceae family, and has important value for breeding and seed production of the plants in the Rutaceae family.

The invention discloses a preparation method of a single-layer graphene field effect transistor with a conductive copper adhesive tape as a back gate. The method comprises the following steps: carrying out thermal oxidation on a silicon wafer, spin-coating photoresist, exposing and developing to obtain an electrode pattern; preparing a metal electrode through etching and thermal evaporation; transferring the graphene film to a prefabricated structure through wet transfer, and performing critical drying; and etching the back silicon dioxide, and taking the conductive copper adhesive tape as a back gate to obtain the graphene field effect transistor taking the conductive copper adhesive tape as the back gate. A method of transferring and prefabricating an electrode in advance is adopted in the preparation process of the device, so that the transferring quality of the graphene is effectively improved; in addition, a test result shows that the conductive copper adhesive tape is used as the back grid electrode, good contact is achieved by increasing the contact area with substrate silicon, good regulation and control on graphene can be achieved within a small grid electrode voltage range, and meanwhile the device shows a large conduction current value.

The utility model discloses a hydrogen-burning fuel gas backflow stable-burning premixing condensing boiler which comprises a lower box body and an upper box body, a water cooling wall is communicated between the lower box body and the upper box body, a plurality of water cooling pipes I are arranged in an air inlet, a flow guide frame body is fixedly connected outside the water cooling pipes I, a plurality of water cooling pipes II are arranged on the downstream of the water cooling pipes I, and the water cooling pipes II are communicated with the upper box body. The second water-cooling pipes are located on the downstream of the first gas channel, second gas channels are formed between the second water-cooling pipes and the adjacent flow guide frame bodies, third gas channels are formed between every two adjacent second water-cooling pipes, a plurality of third water-cooling pipes are arranged on the downstream of the second water-cooling pipes, and a plurality of fourth water-cooling pipes are arranged on the downstream of the third water-cooling pipes. A fin is fixedly connected between the water-cooling pipe II and the water-cooling pipe III, and a water-cooling pipe group I, a water-cooling pipe group II and a water-cooling smoke barrier wall are sequentially arranged in the tapered hearth from upstream to downstream. According to the burner, flame combustion is more stable, meanwhile, the high-temperature flame is cooled, tempering is prevented, and generation of nitric oxide is reduced.

The cup cover comprises a cup cover base, the cup cover base comprises a top cover and a cover body, the cover body is concavely arranged inwards to form a cup cover cavity, and internal threads are arranged on the cavity wall of the cup cover cavity; a penetrating hole is formed in the top cover; the cover body is arranged on the cup cover base in a covering mode, a stroke amplifying mechanism is arranged on the cup cover base, and a driving mechanism is arranged on the cover body; the traction belt is provided with a free end, the free end of the traction belt is arranged in the penetrating hole in a penetrating mode, and the position, away from the free end, of the traction belt is wound around the stroke amplification mechanism; the driving mechanism drives the stroke amplification mechanism to move so as to drive the traction belt to perform stroke amplification motion, and the input stroke of the driving mechanism to the stroke amplification mechanism is smaller than the output stroke of the traction belt; the tea making cup further comprises a cup body, the cup cover covers the cover body, a tea making piece is arranged in the cup body, and the tea making piece is connected to the free end of the traction belt. According to the tea making cup, tea water and the tea making piece can be rapidly separated, the tea making efficiency is improved, and practicability is high.

The utility model provides a novel silicon-rich nutrient solution hydroponic system, which belongs to the technical field of plant hydroponics and comprises a support frame, an inclined strut is mounted at the bottom of the support frame, a hollow support table is fixed at the top of the support frame, a hydroponic component is mounted on the support table, a filter screen is mounted below the support frame, and the filter screen is fixed on the support frame. An inclined plate is mounted below the filter screen, and a liquid storage tank is mounted below the inclined plate; the device further comprises a control assembly and an adding assembly, and the adding assembly is electrically connected with the control assembly. The utility model solves the problems that the concentration and the proportion of nutrient solution are difficult to accurately control during the existing crop water culture, an effective intelligent operating system is lacked, the water culture system is usually operated in a relatively closed environment, once root system diseases occur, the root system diseases are easy to spread quickly in the whole system, large-area infection and loss are caused, and the water culture cost is low. And water resources or nutrient solutions cannot be recycled, and large waste is easily caused.

This invention relates to the field of deep processing technology of white hyacinth bean, specifically to a method for preparing a compound spleen-strengthening and dampness-removing white hyacinth bean paste. This invention utilizes low-temperature roasting to pretreat a specific ratio of dampness-removing medicinal herbs, including licorice, poria cocos, coix seed, and bitter almond, and prepares a compound decoction rich in dampness-removing components. This decoction is then used as a biological stressor to promote the germination of white hyacinth beans, with its concentration controlled to encourage moderate germination and the production of substances that resist adverse conditions. Simultaneously, leveraging the plant's water absorption capacity during germination, the invention incorporates the dampness-removing components of the compound decoction. Stable solid-state fermentation with pure Rhizopus further enhances the dampness-removing components of the compound white hyacinth bean and fermented soybean. This not only increases the content of major dampness-removing components such as polyphenols, proteins, and polysaccharides in the white hyacinth bean and fermented soybean, but also increases the content of trace dampness-removing substances such as rutin, quercetin, kaempferol, luteolin, and picolinic acid. It also promotes the dissolution of dampness-removing amino acids—alanine and glycine. The dampness-removing compound white hyacinth bean and fermented soybean components are clearly defined, and the content of spleen-strengthening and dampness-removing substances is richer.

The invention provides a continuous polymerization method and system of PAO. The continuous polymerization method of the PAO comprises the following steps: firstly, premixing a gas-phase catalyst, an auxiliary agent and part of polymerization raw materials twice, and then mixing the obtained mixture with the residual polymerization raw materials for polymerization reaction to obtain the PAO, wherein the second premixing is carried out in a pipeline static mixer; in the polymerization reaction, three layers of paddles are adopted for mixing, and the paddles are respectively a turbine paddle, a self-suction stirring paddle and an axial flow paddle from bottom to top. According to the method, continuous polymerization production of PAO is achieved, the requirement for large-scale production of PAO can be met, in addition, premixing and mixing are carried out through the pipeline static mixer and the blades of the specific structure respectively, the polymerization reaction efficiency is improved, the polymerization reaction is fully and stably carried out, the conversion efficiency of polymerization raw materials is improved, the PAO viscosity is reduced, and the production cost is reduced. The PAO product is narrow in molecular weight distribution and stable in quality.

A method and device for preparing hexagonal flaky magnesium hydroxide by continuous electrodeposition, belonging to the field of inorganic material preparation. The method comprises: adding a sodium chloride aqueous solution into an electrolytic cell, heating it to 30-60°C, adding bischofite to the anode area and stirring it, so that the Mg 2+ The concentration is 0.1-0.5 mol / L; then electrodeposition is performed. The corresponding device is: a diaphragm is set in the electrolytic cell, which divides the electrolytic cell into an anode area and a cathode area connected only by the diaphragm; the cathode and cathode are distributed in an asymmetric structure; the anode area is provided with a heating device, a stirring device and a filter tank. 2+ The concentration is 0, and the Mg in the anode area 2+ The diaphragm penetrates into the cathode to participate in the reaction under the action of electromigration, thereby reducing or even eliminating the influence of the cathode plate on the growth of the product. At the same time, the cathode reaction zone is expanded to reduce the supersaturation of the reaction, so that the product is directly generated in the cathode reaction zone, and nano-scale hexagonal flaky magnesium hydroxide with good dispersion is obtained. The device has great advantages in low-cost and high-efficiency continuous preparation.

The invention discloses a sulfur-fluorine mixed acid evaporation, concentration and separation system, which comprises a mixed acid separation and concentration device used for heating, concentrating and separating sulfur-fluorine mixed acid, cooling obtained hydrofluoric acid steam to prepare hydrofluoric acid, and conveying obtained low-fluorine sulfuric acid to a sulfuric acid fluorine removal device through a pipeline; the sulfuric acid defluorination device is used for heating and separating low-fluorine sulfuric acid and removing fluorine-containing substances in the low-fluorine sulfuric acid, obtained sulfuric acid is conveyed to the sulfuric acid concentration device through a pipeline, and obtained hydrofluoric acid steam is cooled to prepare hydrofluoric acid; and the sulfuric acid concentration device is used for heating and concentrating sulfuric acid, and the obtained concentrated sulfuric acid is reused in the mixed acid separation and concentration device to obtain production water containing trace sulfuric acid. The invention also discloses a sulfur-fluorine mixed acid evaporation, concentration and separation method. According to the method, high-concentration concentrated sulfuric acid can be obtained from the low-concentration sulfur-fluorine mixed acid in the evaporation and concentration process, and comprehensive utilization of F and S resources is achieved.

The utility model discloses a water-soluble fertilizer applying tank which comprises a trolley, and a dissolving and stirring tank, a standby water tank, a dilution water tank, a high-pressure fertilizer applying tank and a quantitative feeding box which are arranged on the trolley, the quantitative feeding box is arranged on one side of the upper surface of the top of the dissolving and stirring tank, and a stirring motor is arranged in the middle of the dissolving and stirring tank; a wall scraping assembly is arranged on a motor shaft of the stirring motor, a particle discharging assembly is arranged at the bottom of the dissolving stirring tank, a dilution motor is arranged at the top of the dilution water tank, a water pump is arranged on the standby water tank, a water outlet pipe of the water pump is inserted into the top position in the dilution water tank, and a booster pump is arranged on the trolley beside the high-pressure fertilization tank. According to the utility model, the quantitative feeding box can be used for quantitatively feeding a fertilizer into the dissolving and stirring tank so as to control the concentration of the dissolved fertilizer, the wall scraping assembly can be used for effectively scraping scales, a water and fertilizer solution with overhigh concentration can be further diluted in the dilution water tank, and the high-pressure fertilization tank can be used for effectively controlling the fertilization effect.

The utility model relates to the technical field of water electrolysis hydrogen production, and discloses a pH gradient adjusting device which comprises an electrolysis tank, a liquid storage tank and a stirring barrel, the electrolysis tank is communicated with the liquid storage tank through a first water pump and a first water pipe, and the liquid storage tank is communicated with the bottom end of the stirring barrel through a second water pump and a second water pipe. One side of the top of the stirring barrel is communicated with a water inlet pipe, the water inlet pipe is externally connected with water supply equipment, the other side of the top of the stirring barrel is communicated with a feeding pipe, a quantitative discharging mechanism is arranged on one side of the feeding pipe, and a stirring mechanism is arranged in the stirring barrel. The weight of alkaline materials entering the stirring barrel can be controlled by controlling the number of times that the air cylinder drives the quantitative pipe to move back and forth, the amount of water entering the stirring barrel is controlled in cooperation with the liquid level sensor, the concentration of prepared alkaline liquor can be conveniently controlled by workers, and then the PH value in the electrolysis box can be conveniently controlled.

The invention discloses a preparation method of R, R-2, 3-butanediol, which is characterized in that 2, 3-butanedione is used as a raw material, and the preparation of the R, R-2, 3-butanediol is realized through ketoreductase; the method specifically comprises the following operation steps: preparation of immobilized enzyme, construction of a temperature-pH double-gradient reaction system, construction of a coenzyme regeneration system and product separation. The method is used for improving the yield of the R, R-2, 3-butanediol product and improving the purity of the R, R-2, 3-butanediol due to the separation difficulty of the product.

The application provides a clean and efficient electrochemical flow reaction device for vat dyes, which comprises a cathode electrolysis module, an anode electrolysis module and an ion exchange film, the cathode electrolysis module and the anode electrolysis module are arranged on the two sides of the ion exchange film, the outer sides of the cathode electrolysis module and the anode electrolysis module are provided with shell plates, the cathode electrolysis module comprises a cathode functional plate and a cathode plate, the anode electrolysis module comprises an anode functional plate and an anode plate, two pipes for liquid inlet and liquid outlet are arranged on the cathode functional plate and the anode functional plate respectively, the two sides of the ion exchange film are provided with films, the inner sides of the shell plates are provided with insulating plates, and the inner sides of the insulating plates are provided with backing plates. The device has the advantages of simple structure, convenient disassembly, assembly and modification, low cost, easy availability of the materials of the functional plate modules, selection of appropriate functional plates, ingenious design of electrodes, expansion of the electrode plate area, expansion of the electrode area, sufficient contact with the electrolyte, and great improvement of the electrolysis efficiency of the system.