41 results about "Chlorate salt" patented technology

The invention discloses a method for efficiently removing perchlorate in wastewater based on quaternary ammonium salt assisted ultrafiltration, which comprises the following steps: adding quaternary ammonium salt with the carbon chain length of C12-C16 into perchlorate wastewater, enabling quaternary ammonium cations and perchlorate to form nanoscale floc through hydrophobic interaction, electrostatic attraction and Van der Waals force, and filtering through an ultrafiltration membrane to obtain the perchlorate. The high-selectivity and high-efficiency removal of the perchlorate in the wastewater is realized. The method is simple and convenient to operate, can be completed only by adding trace quaternary ammonium salt and combining the trace quaternary ammonium salt with a conventional ultrafiltration process, does not need complex equipment or a regeneration process, avoids the problem of secondary pollution caused by an adsorption material, and is remarkably improved in environmental friendliness. Meanwhile, the composite material also has good anti-anion interference capability and low flux attenuation. The method is wide in material source, low in cost, easy and convenient to operate, free of regeneration, low in operation cost and free of secondary waste, has good engineering popularization potential and is particularly suitable for on-site rapid treatment and large-scale application of perchlorate wastewater.

The present application relates to a kind of methods for removing heavy metal complex in wastewater, comprising the following steps, S1 configuration PMS composite reagent, the PMS composite reagent is made by including the following weight percentage of raw material ball milling, persulfate 50~90%, sulfite 5~30%, hypochlorite 5~20%;S2 in the heavy metal complex-containing industrial wastewater join the PMS composite reagent obtained in the S1, heavy metal in heavy metal complex is Cu, and one or several of Co, Cr, Ni, Pb and Zn, complex in heavy metal complex is one or several of EDTA, NTA, citric acid, oxalic acid, tartaric acid, sorbic acid, stirring is dissolved, and lye is added to maintain the pH of industrial wastewater to 9.5~11.0, and carries out fenton-like oxidation and breaks the complex reaction, after reaction, aftertreatment is obtained, and the regenerated water is obtained.The present application achieves the purpose of removing heavy metal complex in wastewater by the method of in-situ activation of persulfate without additional catalyst or the application of electricity, ultraviolet and other energy.

The invention relates to the technical field of chemical mechanical polishing solutions, in particular to a chemical mechanical polishing solution for silicon carbide and a preparation method thereof, the polishing solution comprises a catalyst, abrasive particles, a dispersing agent, an oxidizing agent, a surfactant, an acid-base regulator and deionized water; the catalyst is nano platinum particles; the abrasive particles are aluminum oxide; the dispersing agent is at least one of sodium polyacrylate, sodium hexametaphosphate, hexadecyl trimethyl ammonium bromide and the like. The oxidizing agent is at least one of permanganate, pypocholoride, dichromate and the like; the surfactant is at least one of sodium dodecyl benzene sulfonate, organic bentonite and the like; the pH regulator is at least one of phosphoric acid, nitric acid, oxalic acid and citric acid. The polishing solution can effectively improve the removal rate of silicon carbide, and meanwhile, a polished silicon carbide wafer is high in flatness and free of scratches.

The invention belongs to the technical field of wastewater treatment, and provides a method for treating wastewater containing perchlorate, which comprises the following steps of: adding mixed quaternary ammonium salt into the wastewater, reacting the mixed quaternary ammonium salt with the perchlorate in the industrial wastewater to generate perchlorate quaternary ammonium salt precipitate, and filtering to remove the perchlorate quaternary ammonium salt in the wastewater to realize the enrichment of the perchlorate, the perchlorate in the industrial wastewater can be reduced to 0.02 mg / L or below. According to the process provided by the invention, the perchlorate in the wastewater is directly recycled in the form of the perchlorate quaternary ammonium salt precipitate, and the recycled perchlorate quaternary ammonium salt precipitate can be used as an oxidant for producing fireworks, so that the perchlorate quaternary ammonium salt is reused, and high-added-value recycling is realized.

The utility model discloses integrated perchlorate treatment equipment which comprises a water storage tank connected with a sewage discharge pipe, a lifting pump is arranged in the water storage tank, and an integral box shell is arranged at the output end of the lifting pump. The middle water tank, the quartz sand filter, the activated carbon filter, the ion exchanger, the pipeline mixer, the precision filter and the two-stage reverse osmosis structure are arranged in the integral box shell and are connected with the output end of the air flotation machine; the bottom end of the air flotation machine is connected with a sludge box through a guide pipe; a plate filter press is arranged at the output end of the sludge box; a plurality of medicament storage tanks are further arranged and are respectively connected with the reservoir, the air flotation machine, the ion exchanger and the pipeline mixer through output pipes. The device disclosed by the utility model is reasonable in structural arrangement, can avoid external interference, is beneficial to improving the overall safety performance, prolongs the service life of the overall structure, does not cause material waste, improves the sewage treatment efficiency, has few byproducts and reduces the treatment cost.

The invention relates to a method and plant for producing hydrogen comprising an electrochlorination unit (10) and a water electrolysis unit (11). In the electrochlorination unit (10), seawater (12) or brine is electrolyzed to produce a liquid hypochlorite stream and an oxygen-polluted hydrogen gas stream. The hydrogen gas is separated from the liquid phase in a degasser vessel (18). High-purity hydrogen produced in the water electrolysis unit (11) from demineralized water (22) is divided into two portions, one portion (37) being mixed with the oxygen-polluted hydrogen in the degasser vessel (18) to form a non-flammable mixed gas, and the other portion (38) being supplied to an ejector (50) for compressing and further concentrating the mixed hydrogen. Optionally, residual oxygen is removed in a DE-OXO unit (54). The invention enables recovery and utilization of hydrogen from electrochlorination processes while improving overall hydrogen yield and safety.

The present invention discloses a method for catalytic oxidation degradation of organic / inorganic wastewater by a calcium-iron-aluminum composite catalytic material and hypochlorite, belonging to the technical field of wastewater treatment. This method is to add the calcium-iron-aluminum composite catalytic material and hypochlorite into organic wastewater and / or inorganic wastewater for catalytic oxidation reaction. Among them, the calcium-iron-aluminum composite catalytic material is obtained by hydrolysis co-precipitation method from calcium salt, iron salt and aluminum salt. The calcium-iron-aluminum composite catalytic material used in this method has good stability in the hypochlorite system, can be reused repeatedly for many times and has a long service life. At the same time, it has high catalytic activity, and shows good adsorption effect, fast oxidation degradation rate, thorough oxidation degradation and high hypochlorite utilization rate for difficult-to-oxidize and degrade organic matters, ammonia nitrogen, metal complexes, etc. in organic / inorganic wastewater, and can effectively solve the technical problems existing in the application of hypochlorite oxidation to the oxidation degradation of organic / inorganic wastewater.

An electrochlorination process includes treating water from a source of water in an advanced water conditioning system that removes at least a portion of anions and cations from the water and produces demineralized water, blending the demineralized water with sodium chloride to form a brine solution, and treating the brine solution in an electrolyzer to form a disinfection solution including sodium hypochlorite having a concentration of chlorate of less than 0.25 mg / L.

The invention discloses a portable handheld solid oxygen generator used in a special environment. The portable handheld solid oxygen generator comprises an oxygen generator body, a heat insulation protective layer and a shell. More than two heat insulation protective layers are arranged between the outer wall of the oxygen generator and the shell, and the overall outer diameter is not more than 70 mm; an oxygen generating core of the oxygen generator comprises chlorate, a catalyst, fuel and a chlorine inhibitor; chlorate is sodium chlorate or potassium perchlorate; the catalyst is one or more of cobalt oxide, cobaltosic oxide, cobalt hydroxide or cobalt chloride; the fuel is metal fuel; the chlorine inhibitor is one or more of barium peroxide or calcium hydroxide. The oxygen generator is fast in oxygen generation, high in purity, small in size, light in weight, free of maintenance, easy to operate, convenient to carry, safe, reliable, high in environmental adaptability and low in surface temperature, and can be used under the limiting working condition without being affected by the external environment.

The present invention relates to the technical field of household appliances, and in particular to a dishwasher, comprising: a main body having an inner container, in which a spray arm assembly is provided; a door body, which is openably provided on the main body; an electrolytic water disinfection mechanism, which is provided on the door body, and the electrolytic water disinfection mechanism comprises: a shell, which has an electrolytic chamber, which is suitable for accommodating a salt solution, a plurality of water inlet holes provided on at least one side of the shell facing the inner container, and water sprayed by the spray arm assembly is suitable for entering the shell through the water inlet holes, a water outlet is provided on the wall of the electrolytic chamber, and the water outlet is arranged toward the inner container; an electrolytic electrode, which is provided in the electrolytic chamber. When the spray arm assembly is in operation, the water sprayed by the spray arm assembly can enter the electrolytic chamber through the water inlet hole, and the electrolytic electrode electrolyzes the salt solution to generate hypochlorous acid and hypochlorite with strong oxidizing properties. After flowing out through the water outlet, the water enters the water circulation system in the dishwasher, and can disinfect tableware and parts in the dishwasher, with good disinfection effect.

The present application relates to a kind of acidic etching waste liquid for FPC copper reduction method, copper reduction liquor and FPC manufacturing system, the method comprises: obtaining acidic etching overflow waste liquid in circuit etching process, the overflow waste liquid includes copper chloride, hydrochloric acid and chlorate;Citric acid is added to acidic overflow waste liquid, and is dissolved and uniformly formed copper reduction liquor, and the citric acid addition amount is 1-10g / L;The temperature of the copper reduction liquor is adjusted to 15-25 ℃;The flexible copper-clad plate is soaked or sprayed using the copper reduction liquor for a certain time;After the flexible copper-clad plate is rinsed and dried, it is placed for use.The copper reduction liquor is composed of acidic etching overflow waste liquid and citric acid.The FPC manufacturing system includes acidic etching device, copper reduction liquor preparation device, copper reduction device and post-processing device.The copper reduction method has the advantages of moderate rate, good controllability and uniform copper reduction.

The invention discloses a perchlorate wastewater treatment device which comprises an automatic lifting assembly, an alarm assembly, a top sealing cover, an auxiliary plate and a wastewater treatment box. The invention belongs to the technical field of wastewater treatment, and provides an automatic lifting assembly and an alarm assembly in order to solve the problem that the water level alarm of an existing perchlorate wastewater treatment device is not obvious enough. When the water level of waste water exceeds the height of the particle storage shell, an L-shaped bent rod automatically drives an auxiliary plate to be lifted, an alarm assembly is synchronously lifted, the alarm assembly penetrates through a moving through groove, and a worker is warned, so that the striking degree of warning the operator is achieved, the warning effectiveness and the equipment safety are improved, and accidents are reduced.

The invention discloses a transition metal-based composite electrode for hydrogen production by alkaline electrolysis of water and a preparation method thereof, and the preparation method comprises the following steps: 1) uniformly dissolving a first transition metal salt and a second transition metal salt in the same organic alcohol respectively, and then mixing the two obtained salt-alcohol solutions to obtain a uniform and stable electro-deposition solution; and (2) a two-electrode system is adopted, the conductive substrate serves as a cathode, the cathode and an anode are immersed in the electrodeposition liquid for electrochemical deposition, then washing and drying are conducted, and the transition metal-based composite electrode evenly deposited with the binary alloy particle layer is obtained. According to the method, the single organic alcohol is selected as the electrode liquid solvent, and the front transition metal chlorate is selected as the solute, so that the introduction of the oxometallate is avoided, the direct conversion from the low-valence front transition metal ions to the rough alloy particle deposition layer is realized, the deposition energy consumption is effectively reduced, and the deposition efficiency is improved. And meanwhile, the catalyst has higher intrinsic hydrogen evolution activity and good mechanical strength and chemical stability, and is suitable for popularization.

A method for preparing stannate through an electrochemical method comprises the steps that tin powder, alkali liquor with the concentration of 2.0-4.0 M and chlorination liquid with the concentration of 1.0 M are prepared, the alkali liquor is a sodium hydroxide solution or a potassium hydroxide solution, and the chlorination liquid is a sodium chloride solution or a potassium chloride solution; the material molar ratio of Sn to the alkali liquor to the chlorination liquid is 1.0: (2.0-4.0): 1.0; under the stirring condition, tin powder is added into alkali liquor, and suspension liquid is formed; adding a chlorination solution into the suspension, heating to 50-80 DEG C, and keeping the temperature for electrolytic reaction until tin is completely dissolved in the solution; and after electrolysis is completed, filtering while the solution is hot, concentrating filtrate, cooling and crystallizing, carrying out centrifugal separation, and washing and drying separated solid substances to obtain a stannate product. The invention provides a novel method for preparing stannate by electrolyzing a sodium chloride / potassium chloride solution to prepare pypocholoride instead of hydrogen peroxide as an oxidizing agent, and solves the problems of potential safety hazards in storage and transportation, poor product stability and the like in preparation of stannate by using hydrogen peroxide in the prior art.

Methods of manufacturing a moisture-activated powder are provided which provide generation and release of chlorine dioxide without detectable amounts of any toxic by-products such as chlorine gas, chlorites, or chlorates. The powder need not be exposed to light before or during exposure of the powder to moisture or relative humidity to generate the gas. The powder can also be prepared under conditions that minimize or prevent decomposition or oxidation of sodium chlorite or premature moisture activation of the powder during the manufacturing process to maximize its activity.

A system for producing hypochlorite, comprises an electrolyser with an inlet for receiving a saline solution and an outlet for the electrolysation products which include hydrogen and hypochlorite; a tank for separating hydrogen from hypochlorite, and a conduit for facilitating the flow of hydrogen and hypochlorite from the electrolyser to the tank; wherein the system further comprising a further conduit from the tank to the electrolyser to facilitate the circulation of hypochlorite from the tank to the electrolyser; wherein the system further comprises one or more of the following a) a heat exchanger which receives hypochlorite from the further conduit; whereby the temperature of the hypochlorite is adjusted prior to returning to said electrolyser; b) a pump for driving the circulation of hypochlorite from the tank to the electrolyser; the pump being configured to drawn in a saline solution for causing the circulation of the saline solution in conjunction with the hypochlorite solution to the electrolyser.

The invention relates to the field of chlorate electrolysis treatment, and discloses an ionic membrane chlorate electrolysis treatment device which comprises a frame, a plurality of electrolytic cells are arranged in the frame, fastening plates are slidably connected to the interiors of the electrolytic cells, a storage tank is fixedly connected to the top end of the frame, and a liquid level balance mechanism is arranged in the storage tank. And a scraping mechanism is arranged outside the frame, a butt joint mechanism is arranged outside the electrolytic bath, the liquid level balancing mechanism comprises a fixed outer cylinder, and the bottom end of the fixed outer cylinder is fixedly connected to the interior of the storage tank. Liquid in the second backflow pipe flows back to the storage tanks through the water pump, and the two storage tanks balance air pressure through the communicating pipe; liquid enters the movable inner cylinder through the first backflow pipe, overflows into the annular space in a waterfall mode after the liquid level exceeds the top edge of the movable inner cylinder and converges into the main storage tank area, flow fluctuation is flattened, the change of the water head on the weir is extremely small, and it is guaranteed that the pressure in the tank is stable.

The invention relates to a chlorate electrolysis assembly line and an electrolysis process thereof, and relates to the technical field of chlorate electrolyte treatment.The chlorate electrolysis assembly line comprises an electrolytic bath, an impurity cleaning mechanism is arranged in the electrolytic bath, an impurity separating mechanism is installed on the front side of the exterior of the electrolytic bath, and an impurity cleaning mechanism is installed on the left side of the top of the electrolytic bath; the impurity cleaning mechanism comprises a frame, the frame is slidably connected to the interior of the electrolytic tank, a first filter plate is mounted in the frame, bearing seats are fixedly connected to the left side of the exterior of the electrolytic tank, a motor is arranged at the top of the bearing seat on the upper side, and a lead screw is fixedly connected to the output end of the motor; and the lead screw is installed in the two bearing seats, the outer portion of the lead screw is in threaded connection with a screw cylinder, a second filter plate is arranged on the left side in the electrolytic tank, and the screw cylinder and the second filter plate are magnetically attracted. The device has the effects that impurities in the electrolyte are rapidly cleaned out, and the collection efficiency of the impurities in the electrolyte is improved.

Provided is a fire extinguishing agent composition characterized by containing a chlorate (A), containing 6 to 1000 parts by mass of a potassium salt (B) with respect to 100 parts by mass of the total amount of the chlorate, and further containing a divalent or higher metal salt (C), in order to realize adjustment of a combustion rate while maintaining the fire extinguishing performance of the fire extinguishing agent composition.

The invention discloses a process and system for directly producing solid polyferric sulfate in a one-step ball milling mixed reaction. Ferrous sulfate containing crystal water and grinding balls are added to a horizontal ball milling reaction equipment cylinder. 30-45 DEG C of hot air are conveyed in the cylinder. The cylinder rotates and drives the grinding balls to slide back and forth. The crystal water-containing ferrous sulfate crystal particles are ball milled and crushed. After the conditioning agent is conveyed in the cylinder and mixed, the chlorate oxidant solid particles are continuously and evenly conveyed into the cylinder for oxidation reaction. The material color gradually turns yellow-brown. More than 98wt% of concentrated sulfuric acid is evenly sprayed into the surface of the material in the cylinder in an atomized form. It is regulated that the hot air temperature entering the cylinder is 45-60 DEG C. The material is further oxidized, hydrolyzed and polymerized under the mechanical force of ball milling mixing and collision to obtain brown solid powdered polyferric sulfate. The crystal water removed containing ferrous sulfate containing crystal water and the water vapor and gaseous by-products produced by the reaction are extracted from the cylinder by negative pressure.

The utility model discloses integrated equipment for removing perchlorate in water, and particularly relates to the technical field of removal of perchlorate in water, the integrated equipment comprises a built-in frame body, and a perchlorate removal auxiliary device is arranged at the upper end of the built-in frame body; the perchlorate removal auxiliary device comprises an in-water perchlorate removal assembly and a stable mounting assembly. According to the integrated equipment for removing perchlorate in water, compared with the prior art, part of harmful gas can be extracted into the gas purification treatment device through the detection extraction pipeline group to be treated and then discharged; according to the device, gas generated by processing treatment is prevented from being directly discharged to pollute the external air environment, and the device is provided with an in-water perchlorate removal assembly, so that the discharge of industrial wastewater reaches the standard, and the problem of excessive pollution of industrial processing to the environment is greatly reduced; according to the device, supporting and pre-burying protection work is conducted through the stable mounting assembly, and the practicability and use convenience of the whole device are greatly improved.

The invention discloses a manganese oxide polyhedral material for an aqueous zinc ion battery and a preparation method thereof. The method comprises the following steps: dissolving a divalent manganese salt and a chlorate in an aqueous solution of acetic acid, subjecting the obtained mixed solution to a hydrothermal treatment, washing the hydrothermal precipitate, vacuum drying, and then annealing to obtain the manganese oxide polyhedral material. The invention utilizes the weak acidity and surface activity of acetic acid and special atmosphere control to prepare a manganese oxide material having a unique polyhedral structure, and has good zinc storage capacity as a positive electrode material for an aqueous zinc ion battery.

The present invention relates to the technical field of water electrolysis, and particularly to an electrolyte additive for improving water electrolysis reaction performance, an electrolyte, an electrolyte solution, and a method for improving water electrolysis reaction performance. The additive includes a non-metal oxyacid salt (sulfate, phosphate, borate, selenate, silicate, carbonate, perchlorate, trifluoroacetate, etc.) and an aqueous solution thereof, and an oxometallate (molybdate, tungstate, vanadate, chromate, niobate, ferricyanate, zincate, aluminate, stannate, etc.) and an aqueous solution thereof, as electrolyte solution additives for a water electrolysis reaction. The present invention provides a use of an oxyacid salt for improving the activity and stability of oxygen evolution during water electrolysis. In particular, the oxyacid salt is also suitable for electrolysis reactions carried out at high and low temperatures. Due to the addition of the oxyacid salt, the present invention reduces the oxygen evolution reaction potential and the charge transfer resistance, increases the electron transport rate, and exhibits relatively fast chemical reaction kinetics, thereby facilitating the improvement of the reaction activity.

The invention relates to a perchlorate wastewater treatment method, which comprises: (1) under a stirring condition, adjusting the pH value of clarified perchlorate wastewater to an acidic state, adding a metal reducing agent, carrying out a reduction reaction, adjusting the pH value of the wastewater to a weak alkaline state by using a sodium carbonate solution, and filtering to obtain a reduced liquid; and (2) carrying out column-loading targeted deep adsorption on the reduced solution obtained in the step (1) by using anion exchange resin to obtain a solution subjected to adsorption deep treatment. The method disclosed by the invention is efficient, rapid, stable, short in flow, low in cost, safe and reliable in wastewater treatment process, simple to operate, environment-friendly, free of secondary pollution, capable of realizing up-to-standard discharge and suitable for industrial production.

The invention discloses a Fe monatomic catalyst as well as a preparation method and application thereof, and belongs to the field of oxidation catalytic materials and fine chemical engineering. The preparation method comprises the following steps: 1) dispersing SiO2 in a solvent, sequentially adding a ligand and FeCl2. 4H2O, carrying out ultrasonic dispersion, and continuously stirring; 2) performing rotary evaporation on the system obtained in the step 1) to obtain solid powder, and fully drying and grinding the solid powder; and (3) putting the powder obtained in the step (2) into a tubular furnace, heating, carrying out pyrolytic reaction, and treating after the reaction is finished, so as to obtain the Fe monatomic catalyst. The preparation method is simple, raw materials are easy to obtain, and industrial production is easy. The Fe monatomic catalyst prepared by the preparation method disclosed by the invention is used for activating a chlorite selective oxidation aromatic hydrocarbon derivative, and the adsorption and activation capability of sodium chlorite can be enhanced, so that the Fe monatomic catalyst has high selectivity on the oxidation aromatic hydrocarbon derivative, and the oxidation selectivity on the aromatic hydrocarbon derivative is improved.

The application relates to the technical field of air purification, and discloses an air purification agent which comprises a solid-phase paste and a solid-phase activator; the paste comprises, in terms of weight fractions, 9-12 parts of cellulose thickening powder, 4-6 parts of sodium alginate, 1.5-2.5 parts of chitin, 13-16 parts of chitosan, 0.5-1.2 parts of zinc oxide, 1.5-2.5 parts of chlorate and 60-70 parts of water; the activator comprises, in terms of weight fractions, 18-23 parts of condensate, 45-55 parts of citric acid and 10-40 parts of flower fragrance; the air purification agent has high stability and a long purification cycle.

The invention refers to an electrochemical equipment (10, 10', 10", 10"', 10"") for the treatment of water contaminated by oxidizable pollutants (such as petroleum hydrocarbons and derivatives, herbicides, pesticides, PFAS and the like), reducible pollutants (such as halogenated organic solvents, perchlorate, nitrate and the like) and / or mixtures thereof. The equipment comprises an anode (1, 1', 1", 1'", 1"") and a cathode (2, 2', 2'", 2"", 2""), jointly referred to as electrodes (1, 1', 1", 1'", 1""; 2, 2', 2", 2"", 2""); the equipment also comprises a voltage or current generator (3, 3', 3", 3'", 3"") and a non- conductive separator (4, 4', 4'", 4"", 4"") placed between the electrodes. The anode (1, 1', 1", 1'", 1"") is preferably made of titanium coated with mixed oxides (preferably, Jr and Ru) and the cathode (2, 2', 2'", 2'", 2"") is preferably made of carbon material in granular form (preferably chosen from graphite, activated carbon and biochar) mixed with ferrous material (preferably chosen from zero-valent iron of millimetric dimensions and iron colloidal suspensions). According to the preferred embodiment of the invention, anode (1, 1') and cathode (2, 2') are concentrically arranged; according to an alternative embodiment of the invention, anode (1") and cathode (2") are made in superimposed modules. The invention also refers to a method that provides that, by applying a voltage (preferably between 0 V and 220 V, more preferably between 1 V and 20 V) or a current (preferably between 0 A and 50 A, more preferably between 0 A and 5 A) between the electrodes, Fenton reagents (i.e., H2O2 and Fe2+ ions) are generated in-situ, said reagents being able of completely oxidizing the pollutants contained in the water to be treated; furthermore, the ferrous material present in the cathode allows the simultaneous chemical reduction (i.e., reductive dehalogenation) of the substances contained in the water. Advantageously, the invention allows to treat waters polluted by toxic and recalcitrant substances without the need to continuously supply from the outside chemical conditioners (such as hydrogen peroxide or other chemical oxidants, iron, air, oxygen and the like). The invention is preferably and advantageously applied for the remediation of contaminated sites and for the treatment of wastewater; the invention is advantageously used both inside wells, piezometers or boreholes and in devices, pipes or reactors, in plug-in configuration.

The invention discloses a chlorate-salt water separation device and a separation method, which relate to the technical field of chlorate-salt water separation. The device comprises a pretreatment unit, an electrodialysis unit, and an evaporation separation unit; the evaporation separation unit is provided with a circulation pump; the electrodialysis unit is provided with a plurality of electrodialysis membrane stacks and a plurality of cleaning mechanisms; a first drive structure, a bidirectional screw device, and a cleaning box cooperate to control a cleaning seat to move back and forth; a conveyor belt structure, a cleaning belt, a first auxiliary roller, and a second auxiliary roller cooperate to enable a cleaning bar to clean the electrodialysis membrane stack; a gravity bar, a return spring, and a rotating member cooperate to adjust the direction of the cleaning bar, thereby improving the cleaning effect of the cleaning mechanism, eliminating the need to stop the electrodialysis unit to disassemble and clean the electrodialysis membrane stack, thereby improving the separation efficiency of the chlorate-salt water and reducing the labor intensity of workers.

The application relates to the field of gas fire extinguishing of fire-fighting equipment, and discloses a low-temperature and low-corrosion hot aerosol fire extinguishing medium, a preparation method and application thereof. The hot aerosol fire extinguishing medium comprises an oxidant and modified aluminum hydroxide, the oxidant is a mixture of strontium nitrate, potassium organic acid and chlorate, the content of silane groups in the modified aluminum hydroxide is 10-30 wt%, and the weight ratio of the oxidant to the modified aluminum hydroxide is 1:0.01-0.5. The hot aerosol fire extinguishing medium is stable in performance during combustion, can effectively reduce the combustion temperature, significantly improve the fire extinguishing efficiency, and simultaneously reduce the corrosiveness to electrical equipment.

The invention discloses a method for echelon removal of perchlorate and nitrate in fireworks and crackers wastewater, which comprises the following steps: (1) denitrification removal: introducing wastewater containing perchlorate and nitrate into a denitrification reactor, and controlling the oxidation-reduction potential in the denitrification reactor to be-100mV to-200mV in a micro-aeration or intermittent aeration mode; adding a first part of a carbon source to realize preferential removal of nitrate; (2) perchlorate reduction: introducing the effluent treated in the step (1) into a perchlorate reactor; the method comprises the following steps: stopping aeration, selecting a closed anaerobic reactor, maintaining an anaerobic environment, and controlling the oxidation-reduction potential in a perchlorate reactor to be reduced to-250 mV to-350 mV; and adding a second part of the carbon source to realize reduction of the perchlorate. The method provided by the invention realizes step-by-step efficient removal of perchlorate and nitrate.