119 results about "Potassium ferrate" patented technology

The invention discloses a potassium ferrate composite environmental remediation material as well as a preparation method and application thereof. The material comprises the following components in percentage by weight: 40-70% of potassium ferrate; 20-50% of a porous carrier; and 5-10% of a stabilizer. The preparation method comprises the following steps: S1, potassium ferrate synthesis: synthesizing potassium ferrate under the action of an auxiliary catalyst by adopting a sodium hypochlorite oxidation method; s2, modifying a porous carrier: activating the porous carrier with acid, soaking the porous carrier in a stabilizer solution, and drying for later use; and S3, composite loading: mixing the potassium ferrate powder and the porous carrier in proportion, then adding a binder, carrying out ball milling, then carrying out tabletting molding, and then carrying out calcination in an inert atmosphere to obtain porous composite particles, namely the environmental remediation material. The composite structure delays decomposition of potassium ferrate, and the validity period of the material is prolonged to 6 months or above. The porous carrier provides adsorption sites and cooperates with the oxidation-adsorption effect to improve the pollutant removal rate. The calcining process enhances the mechanical strength of the material, and is suitable for flowing water or deep soil injection.

The invention belongs to the field of electro-catalysis, and particularly discloses preparation and application of an efficient self-supporting bifunctional electrolytic alkaline seawater catalyst.The catalyst is of a self-supporting stable structure formed by loading FeOOH-NiAl-LDH of a nano-sheet structure on a foamed nickel framework, and the preparation method comprises the following steps that 1, a hydrothermal growth method is adopted, foamed nickel serves as a substrate, and the self-supporting stable structure is formed; the preparation method comprises the following steps: weighing nickel nitrate hexahydrate, aluminum nitrate nonahydrate and urea, dispersing in deionized water, uniformly stirring, transferring into a reaction kettle, keeping at 100-120 DEG C for 10-12 hours, naturally cooling, washing and drying; and (2) adopting a room-temperature dipping etching method, taking flaky sodium hydroxide, dissolving the flaky sodium hydroxide in deionized water, fully dissolving, adding potassium ferrate to form a purple-red FeOOH colloid, putting the NiAl-LDH electrode prepared in the step (1) into the colloid, and dipping and etching at the room temperature of 25 DEG C for 12-24 hours to obtain the FeOOH-NiAl-LDH electrode. The scheme is mainly used for preparing the electrolytic seawater catalyst, and the problem that a traditional self-supporting electrolytic alkaline seawater catalyst is unstable in structure is solved.

The invention belongs to the field of water environment restoration materials, and discloses a preparation method of a slow-release / temperature-controlled ferrate-silicon dioxide core-shell material and an antibiotic removal effect of the slow-release / temperature-controlled ferrate-silicon dioxide core-shell material. The method mainly comprises the following steps: preparing a slow-release ferrate-silicon dioxide core-shell material by adopting an in-situ growth coating synthesis method and combining potassium ferrate with strong oxidizing property on the basis of a silicon dioxide material which is excellent in biocompatibility, relatively large in specific surface area and pore volume and easy in surface modification; furthermore, by loading a phase change material on the slow-release ferrate iron-silicon dioxide core-shell material, a slow-release and temperature-controlled composite material is prepared, and efficient utilization and accurate release of an oxidation active substance are realized. According to the invention, slow-release efficient utilization and temperature-controlled accurate release of oxidation active substances are realized, and the oxidation utilization efficiency and removal capacity of the oxidizing agent on target pollutants are improved.

The invention provides a simultaneous oxidation and coagulation water treatment process and equipment, and belongs to the technical field of water treatment. According to the water treatment process, two water treatment methods of potassium ferrate oxidation and aluminum-iron covalent bond composite coagulant coagulation are integrated in one unit, the purpose of efficiently treating the organic arsenic wastewater is achieved through a synchronous oxidation and coagulation reaction, and floc generated by precipitation is refluxed and reused; and through synergistic adsorption, complexation and enhanced coagulation, organic matter degradation intermediates and inorganic arsenic are removed, and resource utilization and reduction of floc solid waste are achieved. Compared with a traditional pre-oxidation coagulation process, the synchronous oxidation coagulation reaction process constructed by the method disclosed by the invention has an obvious effect of removing pollutants by synergism and mutual promotion. Meanwhile, floc sludge flows back, the concentration of a flocculation medium can be increased, organic matter degradation intermediates and inorganic arsenic are removed through synergistic adsorption, complexation and enhanced coagulation, and waste reduction and efficiency improvement are achieved. The oxidation and coagulation integrated equipment provided by the invention is simple to operate, efficient, low in consumption, safe, green and environment-friendly.

The invention discloses a deep treatment method and system for fracturing flow-back fluid of an oil and gas field, and the method comprises the following steps: firstly, carrying out coagulation pretreatment on the fracturing flow-back fluid; adjusting the pH value of the fracturing flow-back fluid, wherein the pH value is less than 9; then, potassium ferrate or H2O2 and the potassium ferrate are adopted to conduct oxidation treatment on the fracturing flow-back fluid, and the molar mass ratio of the H2O2 to the potassium ferrate is 1: (1-3.5); treating the fracturing flow-back fluid subjected to oxidation treatment by adopting a sequencing batch bio-membrane reactor, and removing organic matters in the fracturing flow-back fluid; and finally, carrying out membrane filtration on the fracturing flow-back fluid by adopting a microfiltration membrane and a nanofiltration membrane in sequence. Based on an oxidation technology, a biological treatment technology and a membrane filtration technology in sequence, an efficient and economical fracturing flow-back fluid treatment scheme is constructed, and the oil content, the median particle size and the SS of treated effluent all meet the II-level water quality standard in Technical Requirements and Analysis Methods for Injection Water Quality Index of Clastic Rock Oil Reservoir (SY / T 5329-2022). Meanwhile, the first-grade standard of Integrated Wastewater Discharge Standard (GB 8978-1996) is met, meanwhile, the potential of treating and discharging the fracturing flowback fluid is achieved, and good practicability is achieved.

The present invention relates to the technical field of nanopowder preparation, and discloses a method for preparing a nitrogen-doped biochar-loaded iron nitride composite material. The process is as follows: (1) potassium ferrate, urea, and waste tea powder are ground and mixed in proportion to obtain a first mixture; (2) the first mixture is reacted in a temperature range of 50-70°C to obtain a second mixture; (3) the second mixture is reacted in a temperature range of 600-800°C for 1-3 hours, and then cooled to room temperature to obtain a third mixture; (4) the third mixture is washed and dried to obtain a nitrogen-doped biochar-loaded iron nitride composite material. Compared with the existing preparation process, the beneficial effect of the present invention is that the operation steps only include grinding, stirring, heating, etc., the operation is simpler, the overall process only involves one pyrolysis, the energy consumption is lower, and the toxic gas ammonia is not used, and the operation is safer. The material can degrade trichloroethylene without an anaerobic environment and can be used for the remediation of organochlorine-contaminated groundwater environment.

The utility model relates to a sewage treatment device based on a ferrate oxidation technology, which belongs to the field of sewage treatment and comprises a sewage delivery pump, a potassium ferrate storage tank, a boric acid storage tank, a ferrate storage tank and a fixed bed reactor, the potassium ferrate storage tank and the boric acid storage tank are respectively communicated with the ferrate storage tank through pipelines; the ferrate storage tank is connected to the lower end of the fixed bed reactor through a delivery pump and a pipeline; the sewage delivery pump is communicated to the lower end of the fixed bed reactor through a pipeline; a cerium dioxide modified activated carbon filler layer is arranged in the fixed bed reactor; a water outlet pipe is arranged at the top of the fixed-bed reactor; according to the device disclosed by the utility model, cerium dioxide and ferrate can form a heterogeneous system in a solid state, so that Fe (VI) is gradually reduced into Fe (V) / Fe (IV), Fe (IV) / Fe (V) is stably generated, the self-decomposition rate of Fe (IV) / Fe (V) is slowed down, the effective utilization rate of Fe (VI) is improved, new organic pollutants in sewage are continuously and effectively removed, and the sewage purification efficiency is improved.

To provide a method for removing phthalate esters in soil.SOLUTION: Following the preparation of a phenate remediation agent from biochar, potassium ferrate, and a spray solution as raw materials, the phenate remediation agent is blended with a phthalate ester-contaminated soil in a specified proportion to remedy the phthalate ester-contaminated soil, thereby enabling the efficient and long-term removal of phthalate esters from the contaminated soil.SELECTED DRAWING: Figure 2

The utility model relates to the technical field of water treatment equipment, and particularly discloses a potassium ferrate powder uniform feeding device which comprises a chemical feeding hopper, a detachable upper cover is arranged at the upper end of the chemical feeding hopper, a chemical feeding port and a first motor are arranged at the top of the upper cover, a first sealing cover is arranged on the chemical feeding port, and a second sealing cover is arranged on the first sealing cover. A stirring shaft located in the dosing hopper is connected to an output shaft of the first motor, a stirring rod is arranged on the side wall of the stirring shaft, a screen fixed to the dosing hopper is arranged below the stirring rod, a mounting cavity and a discharging channel communicated with the interior of the dosing hopper are arranged at the bottom of the dosing hopper, and a second motor and a vibration motor are arranged in the mounting cavity. A chemical feeding wheel is arranged in the discharging channel, an output shaft of the second motor is connected with the chemical feeding wheel, and a plurality of chemical grooves for containing potassium ferrate powder are evenly formed in the side wall of the chemical feeding wheel; according to the potassium ferrate powder adding device, quantitative and uniform adding of potassium ferrate powder is achieved, and the situation that all the potassium ferrate powder is directly scattered into sewage at a time, and consequently chemical waste is caused is avoided.

The invention relates to the technical field of wastewater treatment, and discloses a method for treating low-concentration fluorine-containing organic wastewater based on advanced oxidation-magnetic coagulation precipitation, which comprises the following steps: firstly, adding potassium ferrate into wastewater and stirring to promote the potassium ferrate to decompose to generate hydroxyl free radicals (. OH), oxidizing and degrading organic matters in the wastewater, and removing the organic matters in the wastewater; then adding a saturated sodium sulfite solution to quench the residual oxidant; and then adjusting the pH value of the wastewater, adding polyaluminum chloride, modified imidazoline and Fe3O4, stirring, standing, settling, and separating the precipitate. Polyaluminum chloride (PAC) is dissolved in water to generate high polymers such as [Al (OH) (H2O) 5] < 2 + >, [Al8 (OH) 20 (H2O) x] < 4 + > and the like, the high polymers and F <-> form a complex through a hydroxyl bridging effect, and Al-F precipitate (such as AlF3. 3H2O) is further generated. The low-concentration fluorine-containing organic wastewater is efficiently purified through the oxidation-magnetic coagulation synergistic effect.

The invention provides a method for treating comprehensive wastewater by combining potassium ferrate with oxidation, and belongs to the field of industrial wastewater treatment. The method comprises three stages of wastewater pretreatment and treatment system starting, catalytic oxidation, solid-liquid separation and material regeneration, a Fe3O4 (at) MIP-Azo (at) K2FeO4: Azo-SO3 nanosheet material is combined with potassium hydrogen peroxymonosulfate, a sequencing batch reactor is used for catalytic oxidation treatment of comprehensive wastewater, and the Fe3O4 (at) MIP-Azo (at) K2FeO4: Azo-SO3 nanosheet is recycled after being separated and regenerated. According to the invention, the balance of selective adsorption and broad-spectrum oxidation is realized, the Fe3O4 (at) MIP-Azo (at) K2FeO4: Azo-SO3 nanosheets are used for targeted enrichment of specific pollutants, potassium hydrogen peroxymonosulfate and K2FeO4 are used for full-spectrum oxidation, full-chain treatment of comprehensive wastewater is realized, and the method is especially suitable for deep purification of industrial wastewater with complex components and high toxicity.

The invention discloses a potassium ferrate bottom-oriented enrichment slow-release agent and a preparation method and application thereof, and belongs to the technical field of bottom-oriented enrichment slow-release agents, and the preparation method comprises the following steps: S1, adding polyethylene glycol into water glass, dissolving, adding lithium hydroxide, acidifying, aging, washing, drying, grinding and calcining to obtain a modified carrier; s2, adding a potassium hydroxide solid into the hypochlorous acid solution, adding ferric hydroxide, continuously adding the potassium hydroxide solid, stirring at constant temperature, reacting to obtain a black purple solution, cooling, filtering and drying to obtain a potassium ferrate crude product; s3, adding the potassium ferrate crude product in the S2 into a 3M potassium hydroxide solution for dissolving, adding the modified carrier in the S1, stirring under an ultrasonic condition, then adding a potassium hydroxide solid to be saturated, keeping the temperature, standing, carrying out suction filtration, cleaning a filter cake, and drying to obtain a composite material; s4, grinding and sieving the composite material obtained in S3, mixing with a bottom enrichment agent, and tabletting to obtain a potassium ferrate bottom enrichment slow-release agent; the pond substrate can be improved.

The invention provides a method for removing total DNA (Deoxyribose Nucleic Acid) in wastewater with halide ion tolerance, which is used for removing DNA in wastewater containing halide ions based on a potassium ferrate and calcium sulfite coupling system, and belongs to the technical field of sewage purification treatment. The method provided by the invention utilizes Fe (IV) / Fe (V) / Fe (VI) and flocculent precipitate which are not interfered by halide ions in the reaction of potassium ferrate and slightly soluble calcium sulfite to realize efficient removal of DNA in wastewater. According to the method, the oxidation stability under halide ion interference is remarkably improved, better environmental adaptability and more stable removal efficiency are shown, and a new technical scheme is provided for treatment of actual wastewater containing resistance genes.

The invention discloses a continuous preparation device and method of high-purity potassium ferrate. The device comprises a reaction kettle, a stirring device is arranged on the reaction kettle, the interior of the reaction kettle is divided into an upper reaction area and a lower discharging area by an inclined baffle, a drain valve is arranged at the bottom of the lower end of the baffle, and an observation window is arranged on the side wall of the reaction kettle. The liquid discharging condition of the liquid discharging valve is observed; a discharge hole is formed in the side wall of the reaction area close to the lower end of the baffle; the stirring device comprises a motor fixedly arranged at the top of the reaction kettle, an output shaft of the motor is fixedly connected with a stirring shaft, the stirring shaft vertically penetrates through the interior of the reaction kettle, an anchor type stirring paddle is arranged on the stirring shaft, and the anchor type stirring paddle is located in the reaction area. According to the method, the high-purity potassium ferrate is directly separated from the reaction liquid, re-crystallization and organic solvent washing are not needed, and the obtaining cost of the high-purity potassium ferrate is effectively reduced.

The invention discloses sludge-soil-based flow-state solidified soil and a preparation method thereof.The method comprises the steps that 1, potassium ferrate, sodium hydroxide, sodium tripolyphosphate and water are added into sludge soil and stirred and mixed, and sludge soil slurry is obtained; the mass of the potassium ferrate is 0.2%-0.7% of the mass of the mucky soil; 2, a curing agent and water are added into the mucky soil slurry, stirring and mixing are conducted, and flow-state solidified soil is obtained; the curing agent comprises sulphoaluminate cement, Portland cement, steel slag powder, fly ash, a plasticizer, sodium thiocyanate, calcium formate and sodium silicate. By adopting the preparation method disclosed by the invention, the shrinkage of the cured mucky soil can be reduced, the stable improvement of the curing strength of the early-stage, middle-stage, later-stage and long-term fluid-state cured soil is ensured, and the flowability of the fluid-state cured soil is improved.

The invention discloses a highly efficient composite steel dust and mud washing solution treatment agent, belonging to the technical field of wastewater treatment. The treatment agent raw materials provided by the present invention include: 30-60 parts of sodium hydroxide, 30-60 parts of sodium carbonate, 0.45-0.9 parts of potassium ferrate and 12-16 parts of chitosan-coated loaded calcium peroxide tourmaline. The chitosan-coated loaded calcium peroxide tourmaline is based on tourmaline powder, loaded with calcium peroxide, and coated with a gel solution formed by chitosan to obtain a chitosan film coating layer, which is added to the washing solution. Chitosan can ensure the dispersibility of the loaded calcium peroxide tourmaline while adsorbing heavy metal ions. Calcium peroxide reacts with water, promotes the oxidation of heavy metals on the one hand, forms hydroxide precipitation, and locally releases heat on the other hand to produce a self-polarization effect of tourmaline, further improving adsorption performance. The purification treatment of the washing solution is realized under the synergistic effect of the multiple components of the treatment agent, simplifying the process flow.

The present invention belongs to the field of water environment restoration materials, and discloses a method for preparing a slow-release / temperature-controlled ferrate-silicon dioxide core-shell material and its effect of removing antibiotics. The method mainly includes: using an in-situ growth coating synthesis method, based on a silica material with excellent biocompatibility, large specific surface area and pore volume and easy surface modification, combined with potassium ferrate with strong oxidizing properties, to prepare a slow-release ferrate-silicon dioxide core-shell material; further, by loading a phase change material on a slow-release ferrate iron-silicon dioxide core-shell material, a slow-release and temperature-controlled composite material is prepared, and efficient utilization and precise release of oxidative active substances are achieved. The present invention realizes the slow-release efficient utilization and temperature-controlled precise release of oxidative active substances, and improves the oxidation utilization efficiency and removal capacity of oxidants for target pollutants.

The invention discloses a preparation method and application of ferroboron co-modified magnetic biochar, and relates to the technical field of water body pollution remediation functional materials. The invention aims to solve the problem that the existing adsorption material has a poor adsorption effect on PNP pollutants. The method comprises the following steps: dissolving boric acid into deionized water to obtain a solution a; adding biomass into the solution a, and fully stirring to obtain a solution b; drying the solution b to obtain a mixture c; mixing potassium ferrate with the mixture c obtained in the step S3, grinding and sieving to obtain a mixture d; the mixture d is heated to 690-700 DEG C and calcined for 1.8-2 h; after calcining is finished, cooling, grinding, washing to be neutral, and finally drying and sieving to obtain the ferroboron co-modified magnetic biochar. The preparation method and application of the ferroboron co-modified magnetic biochar can be obtained.

The invention relates to the technical field of sludge treatment, and provides a sludge dewatering and granulating agent, device and method, and the agent comprises a compound agent and sodium silicate; the mass of the compound agent is 2-5% of the mass of the sludge; the mass of the sodium silicate is 50-60% of the mass of the compound agent; the compound agent comprises blast furnace slag and potassium ferrate; the mass ratio of the blast furnace slag to the potassium ferrate in the compound medicament is (10-20): 1. The method comprises the following steps: adding the compound agent into sludge, and stirring to react for 5-10 minutes; adding sodium silicate into the sludge, and stirring for 20-30 minutes; and carrying out filter pressing and granulation treatment on the conditioned sludge to form sludge particles. By integrating and optimizing the sludge treatment process, the treatment efficiency is improved, and the environmental pollution is reduced. The structure is simple, the operation is convenient, and the operation and maintenance cost can be reduced while the treatment effect is ensured.

The invention discloses a method for rapidly improving potassium ferrate water treatment effect under alkaline conditions, which comprises the following steps: adding alkaline printing and dyeing wastewater into a potassium ferrate solution, mixing and standing, inducing potassium ferrate to generate oxidation-reduction reaction by organic matters in the alkaline printing and dyeing wastewater, reducing hexavalent iron ions into tetravalent iron ions, and separating the tetravalent iron ions from the potassium ferrate solution. Forming a solution containing tetravalent iron ions; the prepared solution containing the tetravalent iron ions is put into the alkaline printing and dyeing wastewater to be treated, so that the tetravalent iron ions in the solution containing the tetravalent iron ions and organic pollutants in the alkaline printing and dyeing wastewater to be treated are subjected to full contact reaction, and the alkaline printing and dyeing wastewater is degraded. According to the method, the water treatment effect of the potassium ferrate on the wastewater is remarkably improved, the TOC removal rate is improved by 10%-20% compared with that of a method for directly treating the wastewater through a potassium ferrate solution, the decolorization rate of the wastewater is also remarkably improved and can reach 70% or above, the pollution degree of the alkaline printing and dyeing wastewater is effectively reduced, and the method better meets the environment-friendly emission requirement.

The present invention discloses a method for purifying high-purity potassium ferrate, comprising the following steps: S1, adding a dilute KOH solution with a concentration of 2 to 6 mol / L to a crude potassium ferrate product to fully dissolve the crude potassium ferrate product, and collecting the filtrate for later use; S2, recrystallization: placing the filtrate in a constant temperature water bath, slowly adding a concentrated KOH solution with a concentration of 15 to 20 mol / L during stirring until potassium ferrate solid precipitates from the solution, standing for 15 to 90 minutes, and removing the filtrate to obtain potassium ferrate crystals; S3, washing: washing the potassium ferrate crystals multiple times; S4, drying: placing the washed potassium ferrate on a watch glass and drying it in a vacuum drying oven to obtain high-purity potassium ferrate. The present invention optimizes the purification process and refines the test parameters of the dissolution process, recrystallization process, rinsing process, and drying process to achieve a one-time purification of more than 90%, thereby improving the purification efficiency and reducing the purification cost.

The utility model relates to the technical field of wastewater treatment, in particular to a sequencing batch reaction device for removing total DNA (Deoxyribose Nucleic Acid) in sewage based on a ferrate and calcium sulfite coupling system. The reaction device comprises an active species generation zone, a reaction zone and a precipitation zone. The active species generation area is provided with a potassium ferrate and calcium sulfite liquid inlet, a reaction liquid outlet and a controllable stirring paddle, and a hose communicated with the reaction area is arranged at the bottom of the active species generation area; the reaction area is provided with an acid-base liquid inlet, a pH probe, a submersible stirrer, a reaction liquid inlet, a sewage sample inlet and a liquid medicine outlet, and a hose communicated with the settling area is arranged at the bottom of the reaction area; and the settling zone is of a funnel-shaped structure. According to the sewage treatment device, potassium ferrate and calcium sulfite are ensured to be fully mixed in the active species reaction zone through effective partitioning, so that the utilization efficiency of a medicament is improved, the medicament and sewage are fully mixed in the reaction zone, pollutants are removed, flocculates are removed through gravity settling in the settling zone, and the total DNA in the sewage is effectively removed.

The invention discloses a K4FeO4 solid and a preparation method and application thereof at room temperature. A method for preparing a K4FeO4 solid at room temperature comprises the following steps: S1: adding potassium hydroxide solid to a potassium ferrate K2FeO4 aqueous solution, so that the free alkali content in the solution is greater than 120mmol / L, and obtaining an alkaline potassium ferrate solution; S2: adding a trivalent iron salt solid to the alkaline potassium ferrate solution obtained in step S1, controlling the temperature at 15°C-25°C, reacting for 150min-240min and filtering, and the filtrate is a K4FeO4 solution; S3: vacuum concentrating the K4FeO4 solution obtained in step S2, cooling the concentrated solution to room temperature, and precipitating crystals; washing the obtained crystals with an organic solvent, and recrystallizing with water to obtain pure K4FeO4 crystals. The method for preparing a K4FeO4 solid at room temperature disclosed by the invention has the advantages of high yield, green environmental protection and low cost.

The invention belongs to the technical field of water treatment and disinfection, and particularly relates to a chlorine dioxide releasing agent with low corrosivity and a flocculation function and a preparation method of the chlorine dioxide releasing agent. The chlorine dioxide releasing agent is prepared from the following raw materials in percentage by mass: 8 to 12 percent of potassium ferrate, 16 to 22 percent of sodium chlorite, 15 to 23 percent of organic acid, 12 to 14 percent of ferric salt, 10 to 20 percent of peroxide donor, 6 to 12 percent of succinic acid and the balance of drying agent. The pH value of a solution activated by the chlorine dioxide releasing agent is close to neutral, and the problems that an existing chlorine dioxide releasing tablet is too low in pH and too strong in corrosion are solved; and moreover, the conversion rate of sodium chlorite and the purity of chlorine dioxide are effectively improved. In addition, the releasing agent also has dual effects of disinfection and flocculation of clear water, not only improves the disinfection efficiency, but also greatly reduces the production cost.

The invention discloses an efficient composite steel dust mud water washing solution treatment agent, and belongs to the technical field of wastewater treatment. The treatment agent provided by the invention is prepared from the following raw materials: 30 to 60 parts of sodium hydroxide, 30 to 60 parts of sodium carbonate, 0.45 to 0.9 part of potassium ferrate and 12 to 16 parts of chitosan-coated calcium peroxide-loaded tourmaline. According to the chitosan-coated calcium peroxide-loaded tourmaline, tourmaline powder serves as a base material, calcium peroxide is loaded, a chitosan film coating layer is obtained after coating is conducted through gel liquid formed by chitosan, the chitosan film coating layer is added into a washing solution, the chitosan can adsorb heavy metal ions, meanwhile, the dispersity of the calcium peroxide-loaded tourmaline is guaranteed, calcium peroxide reacts when meeting water, and therefore the heavy metal ions can be effectively adsorbed. On one hand, oxidation of heavy metals is promoted to form hydroxide precipitates, on the other hand, local heat release enables tourmaline to generate a self-polarization effect, and the adsorption performance is further improved. Under the synergistic effect of various components of the treatment agent, purification treatment of the washing solution is achieved, and the technological process is simplified.

The invention provides a method for treating oily sewage through combination of potassium ferrate and sodium hypochlorite, and belongs to the field of oily sewage treatment. The method comprises the steps of pretreatment of oily sewage and wastewater, catalytic oxidation, solid-liquid separation and material regeneration. According to the method for treating the oily sewage through combination of the potassium ferrate and the sodium hypochlorite, the problems that in traditional oily sewage treatment, the utilization rate of an oxidizing agent is low, the sludge amount is large and energy consumption is high are solved, selective adsorption-catalytic oxidation integrated treatment of the oily sewage is achieved, a potassium ferrate decomposition product is Fe (OH) 3 floc, and the potassium ferrate and the sodium hypochlorite are recycled. The catalyst can adsorb residual pollutants and promote solid-liquid separation, no heavy metal sludge is generated, NaClO and K2FeO4 are catalytically activated, the actual dosage of the agent is reduced, and the sludge yield is low. The Fe3O4 (at) MIP-Azo (at) K2FeO4: Azo-SO2Cl nanosheet adopted by the invention realizes integration of multiple functions of adsorption, catalysis, oxidation and magnetic separation, target pollutants in oily sewage can be selectively captured, the local pollutant concentration is improved, and the subsequent oxidative degradation efficiency is accelerated.

The invention discloses a method for removing COD (Chemical Oxygen Demand) in wastewater and application of the method. The method comprises the steps that a composite oxidizing agent A is added into the wastewater, a first stirring reaction is carried out, and effective components of the composite oxidizing agent A comprise sodium percarbonate and manganese dioxide; a composite oxidizing agent B is added into the reacted wastewater, a second stirring reaction is carried out, and effective components of the composite oxidizing agent B comprise potassium ferrate and hydrogen peroxide. The method realizes efficient treatment of high-concentration organic wastewater, and has both economical efficiency and operability.

The invention discloses an oilfield produced water treatment process which comprises the following steps: alternately adding an iron ion transforming agent component A and a powerful component B into oilfield sewage subjected to oil removal and desulfurization treatment; then, adding a universal component C; wherein the iron ion transforming agent component A is one or any combination of potassium permanganate, hydrogen peroxide, bleaching powder, ClO2, chlorine, potassium ferrate, sodium hypochlorite and MnO2; the powerful component B is one or any combination of amino carboxylic acid salts and amino / hydroxyl phosphonic acid salts; and the general component C is one or any combination of hydroxycarboxylic acid or poly (phenol, enol) hydroxyl salts. The invention further discloses the combined reagent for treating the oilfield produced water and application of the combined reagent. The method provided by the invention has an obvious iron ion removal effect.

The invention discloses a method for removing chromium nitride coating on the surface of a glass forming mold and treating waste liquid. Specifically, a glass forming mold coated with a chromium nitride coating is pre-oxidized using an oxidant, and then the mold after the pre-oxidation treatment is placed in a removal liquid for insulation reaction for a certain period of time, so that the removal of the chromium nitride coating on the surface of the mold can be achieved. The removal liquid is composed of a nitrilotriacetic acid complexing agent and hydrogen peroxide, and the oxidant is one or more of a potassium permanganate solution, a potassium ferrate solution, and a potassium dichromate solution. Nitrilotriacetic acid is added to the waste liquid, and after a hydrothermal reaction, a chromium-nitrilotriacetic acid coordination polymer is obtained after filtering, washing, and drying. The chromium nitride coating removal on the surface of the glass forming mold and the chromium-containing waste liquid treatment process are more concise, efficient, green and environmentally friendly. The surface of the stainless steel mold after the chromium nitride coating is removed is flat and corrosion-free, and can be recycled after repeated coating, which greatly reduces the production cost of glass products.

The invention relates to the technical field of potassium ferrate composite material preparation, and particularly discloses a solution filtration treatment device for potassium ferrate composite material preparation, the top of a filter cartridge is fixedly connected with a feed inlet, and the bottom of the filter cartridge is fixedly connected with a fine filtration part; limiting parts are slidably connected to the two sides of the inner wall of the filter cartridge, and a collecting part is fixedly connected to the side, close to the limiting parts, of the side face of the filter cartridge. According to the solution filtering treatment equipment prepared from the potassium ferrate composite material, the anti-blocking component is arranged, the filtering speed can be reduced when impurities block the meshes, and due to the design, blockages can be removed in time, the filtering capacity of the mesh plate can be kept, so that the overall filtering efficiency is guaranteed, and the situation that the filtering process is stopped or greatly slowed down due to mesh blockage is avoided; and the production efficiency is improved, manual frequent cleaning of meshes or replacement of the screen plate is not needed, and the maintenance workload is reduced.