5555 results about "Water washing" patented technology

The invention belongs to the technical field of electrochemistry and energy materials, and particularly relates to preparation and application of a high-performance asphalt-based porous carbon material. The preparation method sequentially comprises the following steps of crushing, heat treatment, pre-oxidation, airflow crushing, carbonization, activation, acid washing, water washing and drying. Compared with the prior art, the high-performance asphalt-based porous carbon material at least has the beneficial effects that the high-performance asphalt-based porous carbon material does not use raw materials such as carbon nanotubes and graphene with relatively high cost on the premise of ensuring sufficient specific surface area and sufficient pore volume value, so that the preparation method has outstanding advantages of simplicity and economy.

The invention provides lithium and aluminum hydroxyfluoride extraction equipment and a low-grade cathode carbon block recovery process, and relates to the technical field of metal recycling, the lithium and aluminum hydroxyfluoride extraction equipment comprises a bracket, a tank body, a mounting plate, a driving mechanism, a reciprocating mechanism, a water washing liquid discharging mechanism and an acid leaching liquid discharging mechanism; the tank body is installed in the support, a top plate is installed at the top end of the tank body through bolts, and a supporting frame is installed on the upper surface of the top plate through bolts. According to the scheme, a layer of pickle liquor is covered and injected after water washing liquid enters, so that the two extracting solutions can be added in a laminated manner, and the water washing liquid and the pickle liquor are quantitatively added in the laminated adding process, so that layered mixing is realized in the adding process of the device, and the efficiency of the device is improved. According to the device, the subsequent stirring time can be shortened, electric power is saved, meanwhile, it is guaranteed that two kinds of liquid are mixed more sufficiently and stably, and meanwhile the internal alkaline balance can be guaranteed through a stacked adding mode.

The integrated intelligent self-adaptive waste gas purification system comprises a waste gas collection unit, a pretreatment unit, a washing spray tower, a dehumidification unit, an activated carbon adsorption unit and an intelligent control system which are sequentially arranged according to a waste gas treatment flow, wherein the waste gas collecting unit is used for collecting waste gas from a plurality of production units; the pretreatment unit is used for removing particulate matters and part of water in the waste gas; the washing spray tower is used for removing harmful substances in the waste gas; the dehumidification unit is used for removing water vapor in the waste gas; the activated carbon adsorption unit is used for adsorbing harmful substances and malodorous substances in the waste gas; and the intelligent control system is used for controlling the purification data parameters of all the processing units. In addition, the invention further discloses an integrated intelligent self-adaptive waste gas purification treatment method. By combining physical, chemical and adsorption technologies, a complete waste gas purification process is formed, the purification efficiency is improved, meanwhile, the operation cost of enterprises is reduced, and remarkable social and economic benefits are achieved.

The invention discloses a cement-based aerogel heat preservation and heat insulation coating material for concrete and a spraying construction process of the cement-based aerogel heat preservation and heat insulation coating material, and belongs to the technical field of concrete materials. The coating material is prepared from powder, composite emulsion and water, and the powder is prepared by mixing superfine sand, cement, modified silicon dioxide-carbon nanotube composite aerogel powder, hollow glass beads, nanofibers, graphene nanosheets, an ultraviolet light absorber, a water reducing agent and a defoaming agent. The composite emulsion is composed of an acrylate copolymer emulsion, a polyvinyl acetate-ethylene emulsion, a temperature-sensitive polymer emulsion and a coalescing agent. Based on the multi-stage pore network and multi-component emulsion optimization design and multi-component synergistic effect, the material has good fluidity after being mixed, and has low heat conductivity coefficient, high strength and high toughness after being hardened; the construction technology of high-pressure water flushing and layered spraying is provided, and the method has the advantages of being efficient in construction, stable in quality and the like and can be applied to heat preservation and heat insulation of a concrete structure in a severe environment.

The invention discloses a self-detoxification process in a household garbage incineration fly ash incineration power plant, which comprises the following steps of: removing chlorine salt and water-soluble and acid-extracted heavy metals in fly ash in a multi-stage countercurrent mode of combining two-stage water washing, acid pickling and water washing to obtain dechlorinated and heavy metal-removed fly ash wet slag; the fly ash is compatible with high-calorific-value general industrial solid waste or aged low-water-content high-calorific-value household garbage, and a fly ash derived fuel rod is pressed; and secondary incineration is carried out through cooperation of an incineration system in the household garbage incineration power plant, so that dioxin detoxification of the fly ash is completed. According to the technology, existing equipment and resources of a waste incineration plant are fully utilized for carrying out in-site fly ash disposal, the fly ash resource utilization cost is saved, the problem of fly ash resource utilization product disposal is solved, and great social benefits are achieved.

The invention discloses industrial-grade mixed oil produced by utilizing kitchen waste oil and a preparation method of the industrial-grade mixed oil, and belongs to the technical field of recycling of the kitchen waste oil. The invention relates to industrial-grade mixed oil produced by using kitchen waste oil and a preparation method thereof, and the preparation method comprises the following steps: firstly collecting kitchen waste containing the waste oil, and storing the kitchen waste in a container through special equipment; carrying out screen solid-liquid separation, cleaning grease on the surface of the solid waste, and then carrying out precipitation separation; then carrying out centrifugal separation, chemical cleaning, water washing, acid treatment, dehydration, degumming and metal ion removal on the separated grease and oil-containing liquid; carrying out ultrasonic-assisted multistage ester exchange after enzymolysis optimization, carrying out membrane separation on glycerol and fatty acid methyl ester, and carrying out reduced pressure distillation to obtain a high-purity fraction; carrying out adsorption refining, plasma treatment and supercritical fluid extraction; finally, nano particles are added and blended with additives, efficient recycling of the kitchen waste oil is achieved, and then high-purity industrial-grade mixed oil is prepared.

The invention provides an integrated containment pressure suppression, filtration and discharge system. The integrated containment pressure suppression, filtration and discharge system comprises a containment, a discharge valve, a discharge pipeline, a spray pipe, a first-stage pressure suppression water tank, a second-stage pressure suppression water tank, a baffle plate steam-water separator, an expansion tank, a rupture disk structure, a combined metal fiber filter layer, a radioactivity monitor, a first stop valve and a second stop valve. The two-stage pressure suppression water tank is arranged, the high removal efficiency of airborne radioactive substances is achieved through two-stage bubbling water washing, then the combined metal fiber filter is arranged by means of an existing cabin, and the requirements for rapid pressure reduction and radioactive substance removal of the containment under the LOCA accident working condition can be met; meanwhile, the problem that the containment filtering and discharging system of the existing nuclear power station occupies too many resources is solved, and the economical efficiency is high.

The invention provides a device and method for removing aerosol based on a charged spraying coupling pool washing mechanism, and belongs to the field of nuclear auxiliary systems. The problem that radioactive aerosol particles generated when a radioactive contamination structure in a reactor is cut underwater can be released into the external environment is solved. Wherein the underwater laser cutting assembly is used for cutting a to-be-cut piece; the auxiliary gas chamber is communicated with the laser cutting nozzle; the aerosol charging assembly can enable aerosol particles generated by underwater laser cutting to carry negative charges; the baffle can gather the aerosol particles and guide the aerosol particles to the aerosol charging assembly; the liquid drop charged spraying assembly can spray liquid drops carrying positive charges, the liquid drops carrying positive charges and aerosol particles carrying negative charges can attract each other and fall to the liquid level, and the Venturi washing assembly can extract gas above the liquid level and spray the gas below the liquid level. The device can efficiently remove radioactive aerosol particles generated by cutting and disassembling radioactive contaminated components in a nuclear power plant, and radioactive contamination to the environment is prevented.

The present application relates to hydrogen production technology field, especially to a kind of methanol hydrogen production method, comprising the following steps: S10: methanol water is heated and vaporized to obtain methanol water vapor;S20: methanol reforming reaction obtains hydrogen mixture gas;S30: after cooling treatment to hydrogen mixture gas, through water washing tower absorption unreacted methanol water, then, adjust the relative humidity and temperature of hydrogen mixture gas;S40: hydrogen mixture gas is input into carbon dioxide absorption tower to remove carbon dioxide;S50: after removing carbon dioxide, product hydrogen is obtained and input hydrogen tank storage to supply user end.The above-mentioned methanol hydrogen production method, by methanol water vapor reforming hydrogen treatment, obtains hydrogen mixture gas.Again, hydrogen mixture gas is purified to obtain product hydrogen with very low carbon monoxide content, with raw material easy to transport, the hydrogen purity of output is high, equipment construction cost is low, and energy consumption is low and the like advantages, reach the purpose of expanding hydrogen application range.

The invention relates to a preparation method of silica gel microspheres used as a catalyst carrier, which comprises the following steps of: adjusting the speed of converting acidified water glass into gel by means of controlling material temperature and material concentration, multiple times of acidification and the like, so that the acidified water glass is atomized to form liquid drops, and then the liquid drops are quickly converted into the gel; and carrying out aging, acid washing, water washing, supercritical carbon dioxide drying, roasting in an atmosphere furnace and the like to prepare the silica gel microspheres with high specific surface area and large pore volume. Compared with the prior art, the specific surface area of the obtained silica gel can reach 250-450 m < 2 > / g, the pore volume can reach 1.5-3.0 cm < 3 > / g, and the silica gel has good strength and fluidity.

The invention relates to the field of test and detection of building materials, in particular to a method for detecting the residual equivalent weight of a flocculating agent in washed fine aggregate, which comprises the following steps: preparing standard samples containing flocculating agents with different concentrations, detecting to obtain a first standard fluidity and drawing a standard curve; a clear soaking solution obtained by fully soaking the washed fine aggregate replaces a flocculant solution to prepare a detection sample, first detection fluidity is obtained through detection, and the residual equivalent of the flocculant in the washed fine aggregate is obtained by combining the standard curve. According to the method, the influence of the difference of the sand on the fluidity is eliminated, the accurate residual equivalent of the flocculating agent is obtained, and the method has high universality.

The invention discloses a device and a process for recycling perchlorate in fireworks and crackers waste, the process comprises the steps of first-stage washing, first-stage solid-liquid separation, concentration, second-stage washing, second-stage solid-liquid separation and crystallization, the separation, recovery and resource utilization of the perchlorate, aluminum powder and other substances in solid waste can be realized, meanwhile, the waste residue is subjected to innocent treatment, and the recycling of the perchlorate in the fireworks and crackers is realized. The pollution to the environment is reduced; and in the crystallization step, a low-temperature evaporation space is divided into a plurality of units, and the negative effects of overhigh evaporation temperature and sudden temperature increase of perchlorate can be effectively avoided in a manner of changing positions of the cells.

The invention discloses a preparation method of an In2O3-Cu-Cu2O ternary heterojunction catalyst and a preparation method of the In2O3-Cu-Cu2O ternary heterojunction catalyst. The method comprises the following steps: at room temperature and normal pressure, firstly, dissolving indium chloride tetrahydrate in a mixed solvent of ethylenediamine-ethylene glycol (the volume ratio is 1: 20-1: 30) and dihydric alcohol amine to obtain a homogeneous solution; then transferring the solution to a hydrothermal kettle, adding deionized water and Cu2O powder with different volumes, and carrying out hydrothermal crystallization at 160-200 DEG C for 10-14 hours; and centrifuging the obtained precipitate, alternately washing with water and alcohol for 2-3 times, carrying out vacuum drying at 60 DEG C for 5-7 hours, heating to 600 + / -10 DEG C at a speed of 3-5 DEG C / min in an N2 atmosphere, calcining for 3 hours, and cooling along with a furnace to obtain a target product. By adjusting the adding amount of the deionized water, the mass proportion of the three phases of In2O3, Cu and Cu2O can be continuously adjusted and controlled, and controllable preparation from'rich copper 'to'rich cuprous oxide' and'stable ternary 'is achieved.

The invention belongs to the technical field of textile dyeing methods, and particularly relates to a tension-free anti-fibrillation dyeing method for lyocell blended yarn. The tension-free fibrillating-resistant dyeing method of the lyocell blended yarn comprises the following steps: preparing a bobbin-free loose yarn bundle, namely loosely winding lyocell pure spinning or blended yarn into tension-free yarn bundles of which the weight is 0.5-1.5 kg by adopting an integrated chuck bobbin, and meanwhile, wrapping the tension-free yarn bundles with knitted sock legs; according to the tension-free loose yarn bundle filling, a cross-shaped lifting chain is matched with a yarn bundle grate, staggered filling shaped like a Chinese character'pin 'is achieved, and the loading rate ranges from 90% to 120%. The tension-free one-bath dyeing / cross-linking comprises the following steps: pre-treating the filled tension-free loose yarn bundle, performing dyeing and cross-linking through a one-bath two-step method, and finally performing soaping, hot water washing, color fixation / softening one-bath treatment and radio frequency drying. According to the tension-free antifibrillating dyeing method for the lyocell blended yarn, dyeing is uniform, the color difference is small, and the percent of pass is increased.

The invention provides a metal gallium extraction device and an extraction method thereof. The gallium extraction device comprises an extraction tank, a base and an extraction mechanism, a top plate is hermetically mounted at the top of the extraction tank through bolts, a mounting cover is mounted at the top of the top plate through bolts, a feeding pipe is mounted on the inner wall of the mounting cover, a recycling pipe is mounted at the bottom end of the extraction tank, a suction pipe is fixedly arranged on the side wall of the extraction tank, and the extraction mechanism comprises a mounting plate fixedly arranged on the inner wall of the extraction tank; according to the scheme, the cleaning plate designed in a special shape is used for controlling the screw rod to rotate in a linkage manner, so that water-phase clarified matters are synchronously treated in the process of discharging a water phase, the interior of the extraction tank can be well and finely cleaned, and meanwhile, the clarified matters are centrally treated, so that the blockage of a recovery pipe can be avoided; therefore, the top plate does not need to be opened for washing, clarified impurities in the extraction tank can be effectively reduced, and the subsequent extraction effect and the extraction stability are ensured.

The invention discloses a control process and equipment for processing waste gas treatment in the generic semiconductor industry, and relates to the technical field of semiconductor, panel, solar energy and LED waste gas treatment. The equipment comprises a gas inlet control unit, a plasma torch, a reaction cavity, a water tank and a washing tower which are sequentially connected, wherein the gas inlet control unit comprises a three-way valve to realize switching of a main machine and a standby machine; the water tank is provided with a heat exchange and monitoring part; the washing tower comprises a washing section, a turbulent flow section and a demisting section. The process comprises the steps of air inlet control, pyrolysis combustion, cooling and pre-dedusting, water washing, washing tower treatment and the like, and is combined with PID control of plasma power and CDA consumption, and logic control of drainage, flushing and the like. The problems of pipeline blockage and corrosion caused by high operation cost, short PM period and poor washing effect in the process of treating high-dust and high-corrosion process waste gas in the prior art are solved, and the method has the advantages of reducing the cost, prolonging the maintenance period, improving the treatment efficiency and the like.

The invention relates to the technical field of aluminum ash washing filtrate recycling intelligent control, in particular to an aluminum ash washing filtrate recycling intelligent control device and method, and the device comprises a multi-parameter online detection module, a data processing optimization module, a process parameter execution module and a filtrate circulation module. The multi-parameter online detection module is used for cooperatively detecting the real-time concentration of trace impurity ions such as fluorine, potassium and sodium through an ion selective electrode array and a micro spectrum analyzer; predicting the dissolution trend of impurity ions through an LSTM model and generating a process parameter adjustment instruction; the process parameter execution module regulates and controls the stirring strength, the liquid-solid ratio and the water-ash contact time in a linkage manner; and the filtrate circulating module is used for buffering, homogenizing and proportionally mixing the washed liquid phase to generate a regenerated leaching medium for recycling. According to the method, the detection data and the model decision are dynamically matched through the closed-loop control process, and the impurity element removal efficiency is improved.

The invention discloses a method for degrading dioxin in fly ash and stabilizing heavy metals, which comprises the following steps: carrying out water washing treatment on the fly ash, and carrying out solid-liquid separation to obtain water washing slag; mixing the washed slag with water, adding zero-valent iron and sulfite, carrying out hydrothermal treatment, and carrying out solid-liquid separation to obtain hydrothermal slag and hydrothermal liquid; according to the method for degradation of dioxin in fly ash and stabilization of heavy metal in cooperation with degradation of dioxin in fly ash, under the combined action of zero-valent iron, chlorite and a hydrothermal environment, efficient degradation of dioxin in fly ash can be rapidly achieved under the lower reaction condition, stabilization of heavy metal in fly ash can be synchronously achieved, and the method is suitable for industrial production. The method has the advantages of being low in cost, mild in reaction condition, high in treatment efficiency, good in treatment effect, environmentally friendly and the like, can effectively solve the problems existing in the prior art, provides powerful support for harmless treatment and resource utilization of the waste incineration fly ash, and has wide engineering application prospects.

Disclosed in the present invention is a method for co-producing 3,3,3-trifluoropropene and 2,3,3,3-tetrafluoropropene. The method comprises: introducing 1,1,1,3-tetrachloropropane, 1,1,1,2,3-pentachloropropane, and hydrogen fluoride into a first reactor, and reacting under the action of a first catalyst to obtain a first reactor reaction product; performing rectification on the first reactor reaction product to obtain a 3,3,3-trifluoropropene product and a tower kettle product, mixing the tower kettle product with hydrogen fluoride, and then introducing the mixture into a second reactor, and reacting under the action of a second catalyst to obtain a second reactor reaction product; and separating the second reactor reaction product from hydrogen chloride, water washing, alkaline washing, and drying to obtain a 2,3,3,3-tetrafluoropropene product. The present invention has the advantages of simple process, high efficiency, flexible operation, low investment, and low energy consumption.

The invention relates to the technical field of dye synthesis, and particularly discloses a 5-substituted amino-5 '-acetamido-3, 3'-dipyridyl derivative as well as a preparation method and application of the 5-substituted amino-5 '-acetamido-3, 3'-dipyridyl derivative. The structure of the 5-substituted amino-5 '-acetamido-3, 3'-dipyridyl derivative is as shown in a formula (I) in the specification, according to the application, N-acetyl blue is used as a parent for modification, and different derivative structures are introduced to amino groups, so that the novel bipyridine dye, namely the 5-substituted amino-5 '-acetamido-3, 3'-bipyridine derivative, is obtained. The 5-substituted amino-5 '-acetamido-3, 3'-dipyridyl derivative has higher color development intensity, and has the advantages of comprehensive color fastness, water washing resistance, acid resistance, sublimation resistance, wet friction resistance, excellent performance and the like when being applied to fabric dyeing.

The invention discloses an environment-friendly electrolyte for anodic oxidation of titanium and titanium alloy workpieces and an electrolytic coloring method. The electrolyte comprises 8-12 parts of lactic acid, 5-10 parts of sodium tartrate, 2-5 parts of sodium bicarbonate and the balance of deionized water. The electrolytic coloring method comprises the steps of pretreatment, anodic oxidation coloring and aftertreatment. The pretreatment comprises alkali washing oil removal, water washing and laser treatment; and an electrolyte mixed by 8-12 parts of lactic acid, 5-10 parts of sodium tartrate, 2-5 parts of sodium bicarbonate and the balance of deionized water is used for anodic oxidation coloring. The post-treatment comprises sealing treatment and drying. According to the technical scheme, the technical problems that the anodic oxidation coloring technology is completely free of fluorine, low in toxicity and safe to operate, and the oxidation waste liquid is free of pollution and easy to treat can be solved, existing pretreatment steps can be simplified, and meanwhile uniform coloring is achieved.

The invention relates to the technical field of component detection, and discloses a carbon dioxide monitoring method and system for an offshore FPSO power station heat pump. The method comprises the following steps: performing component analysis and heat exchange treatment on the FPSO power station flue gas to obtain pretreated flue gas and pretreatment parameters, and performing component detection and water washing purification to obtain first clean flue gas and first treatment data; performing temperature field analysis and absorption monitoring on the first clean flue gas to obtain second clean flue gas, amine-rich liquid and second processing data; performing mass transfer detection and deep absorption on the second clean flue gas to obtain third clean flue gas, a first lean amine solution and absorption parameters; performing energy analysis and regeneration treatment on the rich amine solution to obtain carbon dioxide gas, a second lean amine solution and regeneration parameters; and performing purity analysis and liquefaction treatment on the carbon dioxide gas to obtain liquid carbon dioxide and quality parameters. According to the invention, the efficiency and accuracy of carbon dioxide monitoring for the heat pump of the offshore FPSO power station are improved.

The invention discloses an ethylene-vinyl alcohol copolymer and a preparation method thereof, and relates to the technical field of resin. According to the technical scheme, the preparation method comprises the following steps: adding ethylene, low-carbon alkane, alkyl acid ethyl ester, alkyl acid vinyl ester and a carbon-carbon skeleton initiator into a reaction kettle, and carrying out a free radical polymerization reaction; adding a polymerization inhibitor to terminate the reaction, removing low-carbon alkane, unreacted ethylene and alkyl acid vinyl ester, and preparing the reaction liquid into an alcoholic solution; adding a catalyst into the alcohol solution for saponification reaction, and then performing acid pickling, water washing and drying to obtain the ethylene-vinyl alcohol copolymer. The low-carbon alkane which is low in boiling point, easy to vaporize and high in latent heat of vaporization and the saturated alkyl acid ethyl ester with good solubility are adopted as the mixed solvent to replace a traditional alcohol solvent, so that removal and control of reaction heat are facilitated, generation of insoluble gel is reduced, a copolymer with narrow molecular weight distribution is easy to obtain, and the method is suitable for industrial production. The cost that azeotrope formed by the alcohol solvent and the monomer is difficult to separate and recover is greatly reduced, and the production efficiency is improved.

The invention provides a method for synergistically recovering all elements of crystal silicon cells of a decommissioned photovoltaic module, which comprises the following steps of: collecting large-particle waste crystal silicon cells and grinding the large-particle waste crystal silicon cells to obtain powder; the powder is leached with nitric acid, and leach liquor and impurity-removed silicon powder are obtained; leaching the silicon powder subjected to impurity removal by using an HF solution to remove a silicon nitride layer, and filtering, washing and drying to obtain the silicon powder meeting the industrial standard; the leaching solution is subjected to chlorination precipitation to obtain silver chloride and a leaching solution with silver removed, and after the silver chloride is filtered, the silver chloride is subjected to acid pickling and water washing to obtain silver chloride; sodium sulfide is added into the leaching solution after silver removal, metal in the leaching solution is precipitated, and a solution containing Al < 3 + > can be obtained after filtering; the method comprises the following steps: adding an alkaline substance into a solution containing Al < 3 + >, filtering to obtain an aluminum hydroxide precipitate, and washing the aluminum hydroxide precipitate to remove foreign ions adsorbed on the surface; one technical effect of the invention is that collaborative recovery and treatment of each element in the waste crystal silicon battery piece are realized.

The invention discloses a process for improving anodic oxidation consistency of an anode foil for an aluminum electrolytic capacitor, and relates to the technical field of capacitor manufacturing, and the process comprises the steps of multi-stage washing, etching, feeding, multi-stage formation, intermediate treatment, first post-treatment, roasting, second post-treatment, stability treatment, drying, rolling, inspection and packaging. Wherein the multi-stage formation adopts three-stage oxidation of low-temperature and low-current, medium-temperature and medium-current and low-temperature and high-current, so that an oxidation film forms a base layer, a growth layer and a high-density protection layer which are uniformly overlapped layer by layer, and the consistency and compactness of the oxidation film are synergistically improved through dynamic water washing, air drying and temperature field and fluid field regulation and control technologies; the oxide film is repaired through first post-treatment, the pore size of the oxide film is reduced, and the compactness of the oxide film is improved; and high-temperature roasting is combined, and a second post-treatment step is carried out, so that the oxidation film forms an aluminum oxide crystal structure which is stable, high in hardness and compact in structure, and the water resistance and reliability of the finished anode foil are enhanced.

The invention discloses a method for recovering a silicon wafer and precious metal silver in a decommissioned crystalline silicon photovoltaic panel, which comprises the following steps of: 1, mechanically disassembling and pyrolyzing the decommissioned photovoltaic panel to obtain a crystalline silicon battery piece; 2, preparing molten salt, and heating the molten salt to melt the salt; and step 3, placing the crystalline silicon cell in molten salt, carrying out selective etching separation, taking out the crystalline silicon cell after etching is finished, and washing with water to obtain a silicon wafer and a silver wire. According to the method, the melting temperature of the used fused salt is low, silver and silicon in the photovoltaic panel can be separated in a targeted mode, the fused salt does not react with substrate silicon and silver wires on the surface, the high recovery efficiency of silver and silicon is guaranteed, meanwhile, environmental pollution caused by silver and silicon in the recovery process is reduced, on the basis, silver and silicon can be obtained through one-step separation and recovery, and the method is suitable for industrial production. The method has the advantages of simple operation, short process, environmental friendliness and the like.

The invention belongs to the technical field of resource circulation, and mainly relates to a method for regenerating polycrystalline silicon from waste silicon in a retired photovoltaic module. The method comprises the following steps: carrying out wet etching on waste silicon in the retired photovoltaic module to preliminarily remove impurities; grinding the silicon wafer subjected to impurity removal, performing alloy refining on the ground silicon wafer and one or two of magnesium and zirconium to obtain an alloy material, crushing and screening the alloy material, and performing acid leaching, water washing and drying to obtain primary silicon; and carrying out n times of alloy refining, crushing and screening, acid leaching, water washing and drying on the primary silicon to obtain the solar-grade polycrystalline silicon. The method realizes the primary recycling of the waste silicon of the decommissioned device and the cyclic regeneration of solar grade silicon, has the advantages of low process cost, simple flow, greenness, high efficiency and the like, and has industrialization potential.

The invention relates to an alkaline activated carbon multi-stage synergistic potassium removal method, and belongs to the technical field of activated carbon materials. According to the method, a four-step synergistic process of water washing, acid pickling, ion exchange and nitrogen calcination is adopted, and a waste acid recycling closed-loop system is combined. The deep removal of residual potassium is realized through the synergistic effect of countercurrent water washing, pH (Potential of Hydrogen) staged regulation and control acid washing, deep potassium removal by ion exchange resin and nitrogen protection calcination, and meanwhile, the high specific surface area is maintained; the pickling waste liquid is neutralized, concentrated and crystallized to be converted into agricultural potash fertilizer, and mother liquid is recycled to form green circulation.

The invention provides a method for preparing a high-coercivity sintered neodymium-iron-boron magnet, and belongs to the technical field of rare earth permanent magnet material preparation, and the method comprises the following steps: 1, taking the sintered neodymium-iron-boron magnet as a base material, and removing an oxide layer through alkali washing deoiling, ultrasonic water washing and acid pickling cleaning; 2, taking the Pr-Dy-Cu-Ga quaternary alloy as a diffusion source, and cutting the Pr-Dy-Cu-Ga quaternary alloy into slices; 3, attaching the thin sheet to the surface of a base material for diffusion heat treatment; fourthly, low-temperature tempering is conducted; 5, testing a room temperature demagnetization curve of the sample; light rare earth Pr replaces a part of heavy rare earth Dy and is matched with Cu and Ga elements in a certain proportion to be smelted to obtain quaternary alloy, the quaternary alloy with low heavy rare earth serves as a diffusion source, the microscopic characteristics of the magnet are improved, grain boundary phase distribution is optimized, and under the condition that residual magnetism and the maximum magnetic energy product are slightly reduced, the coercive force of the sintered neodymium-iron-boron magnet is improved; and terbium and dysprosium are not used, so that the use amount of heavy rare earth elements and the production cost are reduced.

The invention provides low-GI corn starch as well as a preparation method and application thereof, and belongs to the technical field of functional starch preparation. The preparation method of the low-GI corn starch comprises the following steps: (1) preparing corn starch into a corn starch solution; (2) adjusting the pH value of the corn starch solution, carrying out heat preservation treatment, and adding branching enzyme to carry out first enzymolysis reaction after the heat preservation treatment; (3) adding branching enzyme again after the first enzymolysis reaction, and carrying out second enzymolysis reaction; and (4) carrying out alcohol washing, water washing, drying and crushing on a product obtained after the second enzymolysis reaction to obtain the low-GI corn starch. According to the preparation method disclosed by the invention, the content of resistant starch in the corn starch can be remarkably increased, the digestibility of the corn starch is reduced, and the GI value of the prepared low-GI corn starch can be as low as 35.