8124 results about "Oxidizing agent" patented technology

The invention discloses a preparation method of a high-compaction lithium manganese iron phosphate positive electrode material, which comprises the following steps: placing a manganese source, an iron source and a phosphorus source in deionized water, stirring, carrying out primary high-speed ball milling, carrying out constant-temperature water bath, adding an oxidizing agent, stirring and oxidizing, and drying the slurry to obtain manganese iron phosphate precursor powder; carrying out primary sintering on the ferromanganese phosphate precursor powder to obtain a ferromanganese phosphate primary sintering material; putting the ferromanganese phosphate primary sintering material into deionized water, adding a lithium source and a carbon source at the same time, and performing stirring, secondary high-speed ball milling and drying to obtain lithium ferromanganese phosphate precursor powder; and carrying out secondary sintering on the lithium manganese iron phosphate precursor powder to obtain the high-compaction lithium manganese iron phosphate positive electrode material. The void ratio is well reduced and good carbon coating is realized by means of secondary grinding and secondary sintering, and compared with the prior art, the method has the advantages that good capacity can be maintained, the powder compaction density of the material can be improved, the conductivity can be improved, and the specific surface area of the material can be effectively reduced.

The invention discloses a dosing system for pre-oxidation enhanced coagulation in a water plant and an intelligent regulation and control method, and relates to the technical field of pre-oxidation enhanced coagulation water treatment. The system comprises a raw water pump, a mixing tank, a tubular static mixer, a flocculation tank, a sedimentation tank, an industrial personal computer and multiple online detection instruments which are sequentially connected in series, so as to monitor the flow, conductivity, pH value, temperature, turbidity, ultraviolet absorbance and organic matter concentration of raw water. Key water quality indexes are monitored in real time through data collection and a pre-oxidation enhanced coagulation regulation and control system based on machine learning of an industrial personal computer, and intelligent and accurate prediction of the dosage of oxidants (potassium permanganate, permanganate composite agents and potassium ferrate) and coagulants is achieved; the effluent turbidity, the effluent ultraviolet absorbance and the effluent organic matter concentration of the sedimentation tank are fed back in real time, the adding amount of the oxidizing agent and the coagulant is dynamically adjusted through a regulation and control algorithm, the effluent quality is guaranteed, and medicine consumption is reduced.

The invention relates to the technical field of material processing, in particular to a silicon carbide polishing solution containing a composite silica sol abrasive as well as a preparation method and application of the silicon carbide polishing solution. The silicon carbide polishing solution containing the composite silica sol abrasive comprises the following components in percentage by mass: 1%-20% of the composite silica sol abrasive, 0.01%-1% of a dispersing agent, 0.1%-10% of an oxidizing agent, 1%-20% of an auxiliary oxidizing agent, 0.001%-0.1% of a pH regulator and the balance of deionized water, the composite silica sol abrasive material comprises at least two kinds of silica sol with the particle size difference being 50 nm or above. Silica sol with different particle sizes is adopted to prepare the irregular composite abrasive material, the irregular composite abrasive material is matched with various assistants to improve the dual effects of chemical oxidation and mechanical friction, the mechanical friction point and wear resistance of the silicon carbide polishing solution can be enhanced, meanwhile, surface scratches and damaged layers of wafers are not prone to being caused in the polishing process, and the surface roughness is low.

The present application relates to the field of wastewater treatment, and provides a treatment system and method for electroless nickel-plating waste liquid. The treatment system comprises a decomplexing pretreatment system; an oxidation-decomplexing system comprising a redox reactor and a decomplexing reactor which are connected in sequence, wherein an oxidizing agent in the redox reactor is oxygen, and an oxidizing agent in the decomplexing reactor is hydrogen peroxide; a chemical precipitation system comprising a neutralization reaction tank and a sedimentation tank which are connected in sequence, wherein the sedimentation tank is equipped with a filter system; and an evaporation crystallization system comprising an evaporation device, a crystallization device, and a separation device which are arranged in sequence. In the treatment system and method for electroless nickel-plating waste liquid, a two-stage oxidation method is employed to achieve oxidation and decomplexing of the waste liquid; in addition, combining chemical precipitation treatment and evaporation crystallization treatment not only reduces the waste liquid treatment cost but also avoids the introduction of other impurities, and allows for the separation of nickel salts and phosphate salts, so that the operation is easy and convenient, the treatment cost is low, the nickel removal rate is high, and resource utilization of nickel is facilitated.

The invention discloses a real-time sewage treatment method and system based on sewage data monitoring, and relates to the technical field of sewage treatment.The method comprises the steps that historical sewage data and sewage data are obtained through a sensor and preprocessed; constructing a change trend prediction model based on the historical sewage data, and analyzing the sewage data; predicting the pollutant concentration value of the specific pollutant concentration in a period of time in the future; according to the predicted pollutant concentration value, calculating the type and the accurate proportion of the medicament needing to be treated; and training and optimizing the model according to a processing effect evaluation result, and adjusting model parameters. According to the method, the defect that chemicals are put according to experience in traditional sewage treatment is overcome, the accurate dosage of the oxidizing agent can be calculated according to the accurate concentration of the organic pollutants when sewage containing the organic pollutants is treated, effective removal of the organic pollutants is guaranteed, waste of the chemicals is avoided, and the treatment efficiency and stability are improved.

The invention discloses a salt leaching-extraction method for recycling lithium iron phosphate and ternary lithium battery powder through cascade circulation, and belongs to the technical field of waste lithium battery recycling. According to the method, ferric salt is adopted as a leaching agent, a circulation mechanism is constructed through iron ion valence state conversion, and cascade leaching circulation of waste lithium iron phosphate and nickel cobalt lithium manganate battery powder is achieved. A concentrated enrichment liquid containing lithium, nickel, cobalt and manganese, iron phosphate and a graphite crude product can be obtained through multiple leaching cycles. In the leaching circulation process, a mixed solvent is developed as an extraction agent of iron ions, and after extraction and hydrochloric acid reverse extraction are carried out on a leaching solution containing iron salt, the leaching agent and the extraction agent can be recycled. According to the method, the valuable metal in the waste battery powder is efficiently leached under the milder reaction condition, consumption of chemicals such as acid and alkali, a leaching agent, an oxidizing agent and an extracting agent is effectively reduced through research of a circulation mechanism, the cost is remarkably reduced, and good environmental benefits and economic benefits are achieved.

The invention relates to an aluminum oxide CMP polishing solution for rough polishing of silicon carbide wafers and a polishing method of the aluminum oxide CMP polishing solution, and the aluminum oxide CMP polishing solution comprises the following components in percentage by weight: 2-10wt% of nano aluminum oxide abrasive; 0.2 to 2 wt.% of a dispersant; 0.001 to 0.01 wt% of a pH regulator; the concentration of the oxidizing agent is 1-5wt.%. By adopting the compound oxidant, potassium permanganate is utilized to oxidize a reduction product manganese dioxide on the surface of the silicon carbide wafer to activate potassium persulfate, so that a large amount of sulfate free radicals are generated in the polishing solution, the oxidability of the sulfate free radicals is extremely high, the polishing solution can be promoted to generate chain oxidation reaction, and the surface of the silicon carbide wafer is further oxidized; and an oxide layer with low hardness is formed on the surface of the silicon carbide and is finally removed under the mechanical action of the aluminum oxide abrasive, so that the ultra-smooth and damage-free surface of the silicon carbide wafer is formed. The surface roughness of the obtained optimal silicon carbide wafer is 0.125 nm, and the material removal rate is 3.5 [mu] m / h. Compared with an existing aluminum oxide polishing solution, the polishing solution has the advantage that the surface quality and the polishing efficiency of the silicon carbide wafer are remarkably improved.

Provided is a polishing composition capable of realizing high polishing removal rate on an object to be polished. The polishing composition provided by this invention is used for polishing an object to be polished. The polishing composition includes water, sodium permanganate as an oxidant, and a transition metal salt different from the oxidant. The polishing composition includes the oxidant in an amount of more than 10 wt %. In some preferable embodiments, the transition metal salt is an oxo-transition metal salt, or a multi-nuclear transition metal complex including a transition metal and one or both of oxygen and hydrogen. The polishing composition can be preferably used in polishing an object formed of a high-harness material having a Vickers hardness of 1500 Hv or higher.

The preparation method comprises the following steps: S1, mixing a hydrochloric acid solution with organic sodium sulfonate, then adding aniline and water, stirring and dissolving, then adding an oxidizing agent to carry out doping reaction, and carrying out suction filtration, washing, drying and grinding on a reaction product to obtain sodium-modified polyaniline; s2, uniformly mixing a negative electrode active material, a conductive agent and polytetrafluoroethylene, and then adding sodium polyaniline and an organic sodium supplement agent in a nitrogen or inert atmosphere for fibration treatment to obtain fibration powder; and S3, performing hot pressing on the fiberized powder onto the current collector to obtain the lithium ion battery. The prepared pre-sodium-modified negative electrode dry-method electrode has relatively good peeling strength and pole piece flexibility, and the condition that a traditional wet-method thick electrode is easy to crack is relieved; meanwhile, the dry-method electrode subjected to sodium modification treatment can induce uniform deposition of sodium ions, so that the dynamic performance of the whole sodium battery is improved, the problem of cyclic sodium precipitation is avoided, and the service life of the battery is further prolonged.

The invention relates to a method for recycling sludge, in particular to a method for enhancing efficient release and recycling of carbon and phosphorus in sludge in a gradient mode. According to the method for stepwise strengthening efficient release and recycling of carbon and phosphorus in sludge, the release efficiency of phosphorus in different occurrence forms in the sludge is improved in a targeted mode, efficient release of inorganic phosphorus and organic phosphorus is achieved through the synergistic effect of multiple steps, meanwhile, efficient release and recycling of carbon are synergistically improved, and the method has the beneficial effects of improving the utilization rate of carbon and phosphorus in sludge and improving the utilization rate of carbon and phosphorus in sludge. The method is used for improving the overall resource recycling efficiency of carbon and phosphorus in the excess sludge and comprises the following steps: 1, pretreating the sludge; 2, pre-treating the green chelating agent to intensify the release of inorganic phosphorus; 3, recovering inorganic phosphorus; 4, resuspending the sludge; 5, strengthening sludge solubilization and hydrolysis by using a peroxidant; 6, anaerobic recycling; 7, recycling carbon and phosphorus resources; the recovery process is simple and convenient, the loss rate is low, the phosphorus recovery rate can reach 80%-99.5%, the acid production efficiency is improved by 14 times or more, and the method has remarkable advantages.

The invention discloses a preparation method and application of a conductive polypyrrole compound. The preparation method comprises the following steps: (1) preparing an emulsion system; (2) adding an oxidizing agent; (3) diluting and dropwise adding monomer pyrrole, and reacting for 6-24 hours; and (4) washing the product, and applying the product to preparation of the foamed conductive polyurethane foam. Comprising the following steps: 1, filtering a conductive polypyrrole compound; 2, carrying out synthesis post-treatment on the conductive polypyrrole compound; 3, effectively mixing the polypyrrole compound with a commercial polyurethane foaming component (firstly premixing with an isocyanate-containing component or a polyol-containing component, and then effectively mixing with another polyol-containing component or an isocyanate-containing component); and 4, carrying out one-time forming foaming to obtain the conductive product. The preparation method has the advantages that better dispersion can be realized by synthesizing the conductive polypyrrole compound which is microcosmically in a nano-scale dendritic shape, and the use amount of a conductive material is reduced; the foamed conductive polyurethane foam is simple and convenient to construct, can be foamed instantly, has high foaming rate, retains the original mechanical properties by more than 50%, and has good conductivity.

The invention relates to the technical field of high polymer materials, and provides a high-performance PVC spool and an injection molding method thereof.The spool is prepared from, by weight, 100 parts of polyvinyl chloride resin; 5 to 10 parts of nano silicon dioxide; 1 to 5 parts of graphene; 2-4 parts of a heat stabilizer; 3-6 parts of an impact modifier; 0.5-1 part of an ultraviolet light absorber; 0.5 to 1 part of an antioxidant; 1-3 parts of a compatilizer; the nano silicon dioxide is surface-modified nano silicon dioxide, and the graphene is modified graphene. The surface-modified nano silicon dioxide, the modified graphene, the heat stabilizer, the impact modifier, the ultraviolet light absorber, the antioxidant and the compatilizer are mixed according to a specific proportion to prepare the PVC spool, and the problems that when the PVC spool is exposed to an ultraviolet, high-temperature or strong acid and alkali environment, aging is fast, the mechanical property is reduced, and the chemical resistance is insufficient are solved.

The invention provides a method for recycling lithium iron phosphate, which comprises the following steps: S1, obtaining lithium iron phosphate black powder, and washing the lithium iron phosphate black powder by using alkali liquor to obtain aluminum-removed black powder and aluminum-containing lithium filtrate; s2, the aluminum-removed black powder is subjected to acid leaching treatment with acid liquor, and acid leaching liquor is obtained; s3, carrying out reduction precipitation treatment on the acid leaching solution by using a composite reducing agent to obtain a copper-removed leaching solution and solid-phase copper-containing slag; s4, adding a phosphorus source and an oxidizing agent into the copper-removed leaching solution, adding alkali to adjust the pH value, and carrying out oxidation precipitation treatment to obtain iron phosphate precipitate and a first lithium-containing solution; and S5, adjusting the pH value of the aluminum-lithium-containing filtrate in the step S1 by using an acid solution to obtain aluminum filter residues and a second lithium-containing solution. According to the method, iron phosphate with relatively high purity can be obtained; meanwhile, the obtained first lithium-containing solution and the second lithium-containing solution are relatively low in impurity ion content and can be used for obtaining a lithium salt product with relatively high purity.

The invention relates to the technical field of preparation of iron phosphate materials, in particular to a method for doping iron phosphate with titanium, which comprises the following steps: 1, dissolving a titanium dioxide by-product ferrous sulfate powder in water to prepare a titanium-containing iron source solution; 2, adding water into the reaction kettle, and stirring; 3, adding the titanium-containing iron source solution, the phosphorus source solution, ammonia water and an oxidizing agent into a reaction kettle to prepare primary slurry; 4, carrying out filter pressing on the primary slurry, washing until the conductivity is less than or equal to 2000us / cm, and then adding water to prepare secondary slurry; 5, phosphoric acid is added into the reaction kettle for bottoming, and the temperature is increased to 60-70 DEG C; 6, adding the secondary slurry into the reaction kettle, and carrying out heat preservation reaction on the secondary slurry and phosphoric acid; and 7, filtering the reaction product obtained in the step 6, washing until the conductivity is less than or equal to 500us / cm, and then drying and sintering. According to the method, the titanium doping technological process is simplified, and meanwhile the titanium element utilization rate in the titanium dioxide by-product and the purity of the titanium-doped iron phosphate product are improved.

The invention relates to a preparation method of a nanofiltration membrane containing a covalent organic framework (COF) interlayer. The nanofiltration membrane (NF) comprises a base membrane, an interlayer and a separation surface layer. The interlayer is formed by in-situ growth of polyphenol and diamine under the action of an oxidizing agent, and the separation surface layer is formed by an aqueous-phase active monomer and multi-element acyl chloride through an interfacial polymerization reaction. According to the invention, an imino covalent organic framework (TpPa-COF) film interlayer is introduced, and a surface polyamide layer is prepared through interfacial polymerization, so that the hydrophilicity of the film and the ability of removing divalent cations are improved. The invention aims to solve the problem of balance between low flux and high separation effect of an NF membrane in separation of monovalent / divalent cations, maintain ideal water flux while ensuring high separation effect, and solve the problem that a traditional NF membrane separation layer has defects. The two-dimensional TpPa-COF material can effectively control the pore size distribution and hydrophilicity of the surface of the substrate and improve the separation performance of the composite membrane. The preparation method is simple, and the obtained nanofiltration membrane has a wide application prospect.

The invention relates to the technical field of total phosphorus detection, in particular to a method for determining total phosphorus in water, which comprises the following steps: 1) digestion treatment: adding an oxidant into a water sample to be detected, and then performing microwave digestion treatment to obtain digested water; a molybdate reagent is added into the digested water, then an improved ascorbic acid solution is added, a chromogenic reaction is completed at the set temperature, and the improved ascorbic acid solution is obtained by mixing an ascorbic acid solution and sodium ethylene diamine tetracetate; measuring the concentration: measuring the absorbance value of the obtained color development product by using a spectrophotometer and a long-optical-path cuvette; and drawing a standard curve: using a phosphorus standard solution as a quality control sample, adding a plurality of calibration points in a low-concentration interval of 0.0-0.1 mg / L, carrying out colorimetric determination, and establishing quadratic equation fitting according to absorbance and concentration so as to determine the total phosphorus content of the water sample to be detected, and the method has the advantages of high sensitivity and good accuracy in total phosphorus testing.

The invention belongs to a new energy material preparation technology, and particularly relates to a preparation method of high-tap-density chemical manganese dioxide and application of the high-tap-density chemical manganese dioxide in a lithium ion battery. The chemical manganese dioxide is obtained by carrying out one-step reaction on divalent manganese salt and an oxidizing agent at proper temperature and pH, the obtained chemical manganese dioxide is in a gamma crystal form, the tap density is greater than 2.38 g / cm < 3 >, the morphology is spheroidic, the purity is greater than 97%, and the impurity content reaches the industrial standard. Compared with a preparation method in the prior art, the preparation method is simple, low in cost and suitable for large-scale production, and the obtained manganese dioxide is high in tap density, good in crystallinity and excellent in electrochemical performance.

The invention discloses a halogen-free flame retardant antistatic nylon, wherein the raw materials of the nylon mainly include a PA6 matrix, a POE graft, a nylon black masterbatch and a modified additive; the modified additive includes a flame retardant-antistatic synergistic additive, a lubricant, an antioxidant and a dispersant; the flame retardant-antistatic synergistic additive includes a microencapsulated halogen-free flame retardant and a compound of modified carbon nanotubes and carbon fibers; the modified carbon nanotubes are grafted with spiropentaerythritol dichlorophosphate (SPDPC) by an organic silicon coupling agent to form a bifunctional organic silane compound. The present application provides a halogen-free flame retardant antistatic nylon and a preparation method and application thereof, which are used to improve the flame retardant and antistatic effects of PA6 and further increase the mechanical properties of PA6.

Disclosed herein is a composition for selectively etching a first silicon germanium layer having a first germanium content in the presence of a silicon layer or a second silicon germanium layer having a second germanium content, where the first germanium content is higher than the second germanium content, the composition including:(a) from 0.1 to 10% by weight of an oxidizing agent;(b) from 1 to 20% by weight of an etchant including a source of fluoride ions;(c) from 0.001 to 3% by weight of a selectivity enhancer of formula Si(d) from 0.001 to 3% by weight of an additional selectivity enhancer of formula S41or derivatives thereof obtained by homocondensation of the compounds of formula S41 or by co-condensation of the compounds of formula S41 with silanes of formula S42 in a weight ratio of 0.1 or moreand(e) water.

The invention discloses a zinc negative electrode and a preparation method and application thereof. The zinc negative electrode comprises a polycatechol coating; and the thickness is 10 nm to 1 [mu] m. The method has the advantages of being green, environmentally friendly and low in cost. Catechol has zinc affinity and can be stably combined with zinc metal to form an ultrathin protection layer, compared with other organic matter coating methods (the process is complex and raw materials are expensive), the method is simpler and rapider, no binder or expensive medicine is needed, the zinc foil only needs to make contact with a modified solution for a certain time, practicability is high, and the method is suitable for large-scale production. The application prospect of large-scale continuous preparation is realized. The added oxidizing agent has the function of accelerating reaction, other metal ions can be introduced to be chelated with catechol, the deposition behavior of zinc ions is further optimized and regulated, and the battery performance is improved. The cycle life of the modified zinc negative electrode battery can reach more than 500h.

Disclosed are a resin substrate-based iron oxyhydroxide desulfurizing agent and a preparation method therefor, falling within the technical field of gas purification and treatment. In the present disclosure, sodium percarbonate is used as a raw material to prepare iron oxyhydroxide. Sodium percarbonate serves both as an alkaline precipitant and as an oxidant. P-aminophenol and formaldehyde are subjected to condensation polymerization to form linear phenolic resin, which is then modified with terephthalyl alcohol to connect into a cross-linked network structure resin. The resin is used as a substrate to obtain the resin substrate-based iron oxyhydroxide desulfurizing agent. The preparation method of the present disclosure is simple and achieves a larger sulfur capacity and desulfurization efficiency, making it suitable for the removal of hydrogen sulfide from waste gas.

The invention belongs to the technical field of lithium batteries, and particularly relates to a lithium manganate positive electrode material, a preparation method thereof and a lithium battery, and the method comprises the following steps: adding a manganese sulfate solution, a precipitator and a complexing agent into a reaction kettle in a parallel flow manner, reacting under a first preset reaction condition, and introducing a first oxidant while reacting to obtain a mixed solution; concentrating the mixed solution to preset solid content, and adding a curing agent for curing reaction to obtain manganous-manganic oxide slurry; adding a manganese sulfate solution, a precipitant and a complexing agent into the reaction kettle in a parallel flow manner again, reacting with the manganous-manganic oxide slurry under a second preset reaction condition, introducing a second oxidizing agent while reacting to obtain a composite manganese oxide mixed solution, and filtering, washing and drying to obtain a composite manganese oxide; the composite manganese oxide and lithium carbonate are mixed, calcined, crushed and graded to obtain the lithium manganate positive electrode material, so that the electrochemical performance of the lithium manganate positive electrode material is improved.

The invention provides an impurity removal and recovery method of electrodeposited nickel anolyte, which comprises the following steps: (1) mixing the electrodeposited nickel anolyte with liquid caustic soda, carrying out solid-liquid separation to obtain nickel hydroxide and filtrate, and evaporating the filtrate to obtain sodium sulfate; mixing the electrodeposited nickel anolyte with a nickel source to obtain a mixed solution; (2) mixing the mixed solution with barium salt, and carrying out lead removal treatment; (3) adjusting the pH value of a material obtained after lead removal treatment by using nickel hydroxide to obtain a solution to be subjected to arsenic removal, and mixing the solution to be subjected to arsenic removal with polyferric sulfate for arsenic removal treatment; and (4) a material obtained after arsenic removal treatment is mixed with an oxidizing agent, a solution to be subjected to iron removal is obtained, solid-liquid separation treatment is conducted on the solution to be subjected to iron removal, catholyte with lead, arsenic and iron removed and iron-containing slag are obtained, sodium sulfate is supplemented into the catholyte with lead, arsenic and iron removed, and the catholyte is reused in the nickel electrodeposition process. According to the method, lead, arsenic and iron in the electrodeposited nickel anolyte can be efficiently and rapidly removed and recycled.

The invention discloses high-crystallinity smooth silver powder, preparation of the high-crystallinity smooth silver powder and silver paste containing the high-crystallinity smooth silver powder. A preparation method of the silver powder comprises the following steps that a silver ammonia solution is obtained; the pH value of the silver-ammonia solution is adjusted to be alkaline through a pH adjusting agent, then a stabilizer is added, ultrasonic treatment is conducted, and silver crystal nucleuses are obtained; sequentially adding a charge control agent and a silver crystal nucleus into the dispersing agent solution, and uniformly stirring to obtain a reaction base solution; and the oxidant solution and the reducing agent solution are dropwise added into the reaction base solution at the same time, stirring reaction is conducted, and the high-crystallinity smooth silver powder is obtained. The mechanism for preparing the high-crystallinity smooth silver powder is mainly reflected in precise regulation and control of silver crystal nucleation, growth and surface modification, and the comprehensive characteristics of smooth particle surface, clear edges, high crystallinity and small particle size are achieved through the multi-factor synergistic effect.

The invention discloses a super-hydrophobic road ice-inhibiting coating based on a photothermal effect and nano modified particles and a preparation method of the super-hydrophobic road ice-inhibiting coating. The preparation method comprises the following steps: introducing silane modified nano silicon dioxide (SiO2) and titanium dioxide (TiO2) particles into a polyaniline solution, and preparing the composite super-hydrophobic powder through a chemical oxidation polymerization method. The preparation method comprises the following steps: firstly, modifying the surfaces of SiO2 and TiO2 nanoparticles by adopting a silane coupling agent, and endowing the SiO2 and TiO2 nanoparticles with low surface energy and hydrophobic property; and then adding the modified nano-particles into an aniline monomer solution, reacting with doped acid and an oxidizing agent, so that polyaniline molecules are subjected to in-situ polymerization on the surfaces of the particles, and the composite super-hydrophobic powder with a micro-nano structure is formed. The obtained composite material has excellent photothermal conversion performance and super-hydrophobic performance at the same time, and the efficient photothermal material heat absorption ice melting effect and the synergistic ice restraining effect of the photothermal material and the super-hydrophobic material can be achieved. Compared with a traditional ice-inhibiting coating, the coating disclosed by the invention shows stronger ice-resisting capability in a low-temperature and high-humidity environment, has good durability, mechanical stability and environmental protection property, and is suitable for the field of ice prevention and ice inhibition in cold regions such as roads, bridges, airport runways and the like.

The invention discloses a synthesis method and application of an iron-aluminum co-doped catalyst, and the synthesis method is characterized by comprising the following steps: S1, dissolving an aluminum metal salt and an iron metal salt in a beaker containing deionized water to obtain a solution A; s2, adding a phosphorus source into the solution A, and adjusting the pH to form a turbid liquid B; s3, biomass is added into the turbid liquid B to be stirred for 30 min, and a solution C is obtained; s4, adding a nitrogen source into the solution C, and drying the beaker in a water bath kettle; mixing the obtained dried product with an activating agent, and calcining under inert gas to obtain a catalyst crude product; and S5, grinding the catalyst crude product, washing with ethanol and deionized water, and carrying out vacuum drying to obtain the iron-aluminum co-doped catalyst. The preparation method is simple and low in equipment requirement. The invention discloses a novel nitrogen-doped carbon-coated zero-valent iron nanoparticle catalyst which can degrade pollutants by utilizing electron transfer of the pollutants and the catalyst under the condition of adding any oxidizing agent. Under the neutral room temperature condition, the catalyst has a very good removal effect on degradation of organic pollutants which are difficult to biodegrade, has very good stability, and is low in iron ion dissolution rate.

The invention relates to a chemical mechanical grinding system and method for a hard and brittle semiconductor wafer, and the chemical mechanical grinding method comprises the following steps: preparing an oil-based thermal activity-optical activity composite grinding fluid by adopting an organic thermal decomposition type oxidizing agent, an organic optical decomposition oxidizing agent, polyethylene glycol, glycerol and vegetable oil; building an ultraviolet light-diamond abrasive grinding wheel chemical mechanical grinding platform which has an ultraviolet light irradiation function and is adjustable and controllable in irradiation intensity and ultraviolet light wavelength; the chemical mechanical grinding platform and the minimal quantity lubrication liquid supply device are started, and the wafer to be machined and the diamond abrasive grinding wheel are controlled to rotate relative to each other for opposite grinding; turning on an ultraviolet light generator to accurately irradiate the thermal activity-optical activity composite grinding liquid drops on the surface of the wafer, inducing a thermal decomposition type oxidizing agent and an optical decomposition type oxidizing agent to generate active free radicals by utilizing grinding heat energy and ultraviolet light irradiation energy, and initiating a free radical oxidation reaction of a wafer surface layer material to form an oxidation layer with low interface bonding force; the oxide layer on the surface of the wafer is removed through small-load micro-cutting of the diamond abrasive, and the semiconductor wafer with the subsurface almost free of mechanical damage is efficiently obtained.

A bioleaching composition for treating ores or other materials including metals or metal salts is presented, wherein the bioleaching composition includes a biosurfactant and a metal solubilizing agent. The biosurfactant may be a sophorolipid biosurfactant (SLP), and the metal solubilizing agent includes an acid and an oxidizing agent or a microorganism. In a bioleaching process using the bioleaching composition, the metal in the ore may be separated from a solution phase or a non-solution phase. Compositions derived from microorganisms are also provided for the pre-leaching treatment of a metal source, which compositions can be used to reduce impurities in the metal source. The use of the bioleaching composition increases the extraction rate and / or the throughput of the process.

The invention belongs to the technical field of environmental engineering, and particularly relates to a method for enhancing the reaction efficiency of a Fenton-like fluidized bed through intelligent magnetic control. Specifically, customized composite magnetic particles are placed in a columnar Fenton-like fluidized bed reactor with an electromagnetic coil array distributed on the periphery, percarbonate activated by iron and aluminum phosphate is used as an oxidizing agent, and magnetic fields with different directions and intensities are applied to the magnetic particles by utilizing the electromagnetic coil array; the magnetic particles guide the fluid to form a required flowing form, and the fluid flowing path and the mixing process are highly accurately controlled, so that the aims of fully mixing the composite magnetic particles with the percarbonate ions, efficiently generating secondary oxidants such as hydroxyl free radicals, carbonate free radicals and superoxide anion free radicals and efficiently degrading pollutants are fulfilled.

The invention provides an iron manganese phosphate precursor and a preparation method thereof, a lithium iron manganese phosphate positive electrode material and a preparation method thereof, a lithium ion battery and electric equipment, and relates to the technical field of new energy. The ferromanganese phosphate precursor provided by the invention comprises secondary particles composed of a plurality of primary particles, the primary particles are nano dotted particles, the diameter of the primary particles is 20-300nm, the secondary particles are of a blocky structure, and the morphology of the ferromanganese phosphate precursor can improve the electrochemical performance and the compaction density of the material. According to the preparation method of the ferromanganese phosphate precursor provided by the invention, a salt solution is taken as a base solution, and a phosphorus source solution, an oxidizing agent and a pH regulator are jointly fed, so that uniform precipitation of Mn and Fe is realized; regulation and control of nucleation, growth process, crystallinity and dotted primary particle size are realized by regulating and controlling the reaction temperature, the adding rate of the oxidant and the phosphorus source and the reaction pH value.