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176 results about "Hexavalent chromium" patented technology
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Hexavalent chromium (chromium(VI), Cr(VI), chromium 6) is any chemical compound that contains the element chromium in the +6 oxidation state (thus hexavalent). Virtually all chromium ore is processed via hexavalent chromium, specifically the salt sodium dichromate. Approximately 136,000 tonnes (300,000,000 lb) of hexavalent chromium were produced in 1985. Additional hexavalent chromium compounds are chromium trioxide and various salts of chromate and dichromate, among others. Hexavalent chromium is used in textile dyes, wood preservation, anti-corrosion products, chromate conversion coatings, and a variety of niche uses. Industrial uses of hexavalent chromium compounds include chromate pigments in dyes, paints, inks, and plastics; chromates added as anticorrosive agents to paints, primers, and other surface coatings; and chromic acid electroplated onto metal parts to provide a decorative or protective coating. Hexavalent chromium can be formed when performing "hot work" such as welding on stainless steel or melting chromium metal. In these situations the chromium is not originally hexavalent, but the high temperatures involved in the process result in oxidation that converts the chromium to a hexavalent state. Hexavalent chromium can also be found in drinking water and public water systems.
Device for treating wastewater containing hexavalent chromium ions
ActiveCN224105627UWater contaminantsWater/sewage treatment by electrochemical methodsCathodic reactionPorous carbon
The utility model discloses a device for treating wastewater containing hexavalent chromium ions, which comprises an anode reaction zone, a cathode reaction zone, a buffer zone, an electrocoagulation reaction zone and an inclined tube settling zone which are communicated in sequence, a suspended partition plate is arranged between the anode reaction zone and the cathode reaction zone, a graphite plate array is arranged in the anode reaction zone, and the graphite plate array is arranged in the inclined tube settling zone. A porous carbon material is arranged in the cathode reaction zone, the cathode reaction zone is communicated with the buffer zone, the buffer zone is communicated with the electrocoagulation reaction zone, an iron pole plate array is suspended in the electrocoagulation reaction zone, the electrocoagulation reaction zone is communicated with the inclined tube settling zone, and the inclined tube settling zone is communicated with the inclined tube settling zone. And an inclined tube is suspended in the inclined tube settling region. According to the utility model, hexavalent chromium ions in water can be removed by only using electricity and a small amount of iron element, reducing agent chemicals and acid and alkali agents used for treating hexavalent chromium in the traditional process are greatly reduced, and the salt content of effluent is far lower than that of the traditional treatment process.
Owner:SHANGHAI TETRELS MATERIAL TECH CO LTD
Remediation method of hexavalent chromium polluted underground water
The invention provides a remediation method for hexavalent chromium polluted underground water, and relates to the technical field of water treatment. According to the preparation method, rice hulls are adopted as raw materials and treated through an oxygen-limited pyrolysis-ferric salt dipping composite technology, and the rice hull-based iron-rich biochar material is obtained; loading microorganisms with the rice hull-based iron-rich biochar material to obtain an adsorption material; the adsorption material is used for carrying out adsorption treatment on the hexavalent chromium-containing polluted underground water. Aiming at Cr (VI) polluted underground water, a prepared rice husk-based iron-rich biomass material is adopted to load domesticated soil indigenous microorganisms, and the domesticated soil indigenous microorganisms are added into a nearly neutral Cr (VI) polluted soil / underground water reaction system, so that efficient reductive degradation of Cr (VI) is realized, and the influence mechanism of Fe < 3 + > is explored.
Owner:CHINA UNIV OF MINING & TECH
Electrophoretic coating with high weather resistance and high salt mist resistance and preparation method thereof
The invention belongs to the technical field of coating compositions, and discloses an electrophoretic coating with high weather resistance and high salt mist resistance and a preparation method thereof. According to the coating, a composite pigment and filler system formed by compounding a surface-modified sheet-shaped physical shielding filler and a calcium / zinc double-ion exchange type corrosion inhibition filler is adopted, and the surface-modified sheet-shaped physical shielding filler forms a compact labyrinth structure to prolong a corrosion medium permeation path; the corrosion inhibition filler releases Ca < 2 + > / Zn < 2 + > under the stimulation of chloride ions to generate a composite precipitation membrane in situ to block electrochemical corrosion; the two components are co-ground and pre-dispersed and chemically bonded with a resin matrix through a silane coupling agent, so that the compactness, the adhesive force and the self-repairing capability of the coating are improved. The electrophoretic coating does not contain hexavalent chromium and is suitable for high-end protection scenes such as automobiles and ocean engineering.
Owner:SHANGHAI WEITU ENVIRONMENTAL PROTECTION NEW MATERIALS CO LTD
Step-by-step leaching remediation method for chromium-contaminated soil
The invention provides a step-by-step leaching remediation method for chromium-contaminated soil, which comprises the following steps: mixing the chromium-contaminated soil and a first leacheate, carrying out first oscillation, then adding a second leacheate into the mixture, and carrying out second oscillation to obtain the remediated soil, the first leacheate comprises sodium salt; the second leacheate comprises organic acid and ferric salt; the temperature of the second oscillation is 70 DEG C to 90 DEG C. The method comprises the following steps: desorbing and releasing hexavalent chromium adsorbed on the surfaces of soil particles by using a sodium salt eluting agent, dissolving the soil particles to promote release of insoluble hexavalent chromium, and dissolving the soil particles containing high-concentration insoluble hexavalent chromium by using a composite eluting agent of organic acid and ferric salt under a high-temperature condition. And when the hexavalent chromium is released, the hexavalent chromium is efficiently reduced and stabilized, so that the aim of removing the hexavalent chromium in the polluted soil is fulfilled.
Owner:CHONGQING UNIV
Photocatalytic material as well as preparation method and application thereof
PendingCN121513912AWater treatment compoundsWater/sewage treatment by irradiationHydration reactionArginine
The invention relates to the technical field of sewage treatment, and discloses a photocatalytic material and a preparation method and application thereof.The method comprises the following steps that bismuth nitrate pentahydrate and sodium bromide are added into a mannitol solution according to the molar ratio of 1: 1.5, and ultrasonic dispersion is conducted to form turbid liquid; adding arginine into the turbid liquid, wherein the molar ratio of the arginine to the bismuth nitrate pentahydrate is (0-2.5): 1; adjusting the pH value of the turbid liquid and stirring to obtain a precipitate; the precipitate is filtered, washed and dried, and the photocatalytic material nVBi-(110) BiOBr is obtained.By means of the photocatalytic material, the removal rate of hexavalent chromium in alkaline wastewater with the pH being 7-10 can still exceed 90% within a short time, the photocatalytic material shows excellent stability and reaction activity, the technical problem that hexavalent chromium is difficult to remove efficiently in the alkaline environment is successfully solved, and the photocatalytic material has good application prospects. The method has important environmental application value and popularization potential.
Owner:NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S
Water-soluble hexavalent chromium filtering and collecting device
ActiveCN224252223Uprevent dumpingno lossGravity filtersStationary filtering element filtersBüchner funnelWater soluble
The utility model relates to a water-soluble hexavalent chromium filtering and collecting device, which belongs to the field of laboratory collection, and comprises a Buchner funnel (1) and a tray (2), the Buchner funnel (1) comprises a funnel opening (3) and a funnel neck (4), the funnel neck (4) is arranged at the bottom of the funnel opening (3), the funnel neck (4) is connected with the tray (2), the Buchner funnel (1) is taken out, and a beaker (11) filled with filtrate is taken out at the same time. The Buchner funnel (1) is provided with a suction filtration bottle (5), the suction filtration bottle (5) is provided with an extraction opening (6), the extraction opening (6) is connected with an extraction pipe (7), the extraction pipe (7) is connected with the suction filtration bottle (5), and the suction filtration bottle (5) is connected with the suction filtration bottle (5). The exhaust pipe (7) is connected with a vacuum pump (8), so that the filtering effect is improved, and the filtering is faster.
Owner:ANHUI JINGGONG TESTING CENT CO LTD
Modified chrome-corundum ramming mix, preparation and construction process thereof
The application relates to a modified chrome-corundum ramming mixture and a preparation and construction process, and belongs to the technical field of chrome-corundum ramming mixtures. The ramming mixture comprises A material, B material and C material, the A material comprises chrome-corundum aggregates, titanium dioxide-coated alumina microspheres, calcium sulfide dihydrate and porous silicon carbide microspheres; the B material comprises chromium oxide-zirconium oxide composite nano powder, sodium thiosulfate pentahydrate, tricalcium phosphate and hexagonal boron nitride flaky crystals; and the C material comprises an aluminum dihydrogen phosphate-magnesium hydroxide compound, a calcium fluoride-alumina eutectic body and a silane coupling agent. The preparation process comprises pretreatment of components, preparation of composite powder and layered preparation; and the construction process comprises the steps of pretreatment, wet mixing, layered ramming, negative pressure infiltration, medium-temperature reaction, spraying and curing and overall sintering. The application can effectively inhibit the generation of hexavalent chromium, significantly improve the thermal shock resistance, mechanical strength and heat conduction performance of the material, and has the advantages of good environmental protection, long service life, excellent construction performance and the like.
Owner:YING KOU SHI XING REFRACTORY TECH CO LTD
Automatic dosing control device for reducing hexavalent chromium in electroplating wastewater
The utility model provides a kind of electroplating wastewater hexavalent chromium reduction automatic dosing control device, including pH adjusting pool, reduction reaction pool, sampling pump, video recognition system, control assembly, dosing pump and dosing tank;Reduction reaction pool is connected after pH adjusting pool;Sampling pump is connected with reduction reaction pool by sampling pipeline, and video recognition system is connected after sampling pump, and video recognition system is reconnected to reduction reaction pool by reflux pipeline after video recognition system;Video recognition system is connected with control assembly, and control assembly is connected with dosing device, so that control assembly controls dosing device according to video recognition system signal.The utility model uses video recognition system to replace ORP controller, without accurate control wastewater pH value.
Owner:GUANGDONG HONGYAO ENVIRONMENTAL PROTECTION ENG CO LTD
In-situ method and device for remediation of hexavalent chromium contaminated groundwater
The present application relates to the technical field of groundwater pollution remediation, and particularly relates to a method and device for in-situ remediation of hexavalent chromium contaminated groundwater, wherein the device comprises a multifunctional well group, a medicament supply system, an aeration system, a monitoring system and a control system; the multifunctional well group comprises a plurality of multifunctional wells; the medicament supply system is used for pretreating medicaments, modified composite reducing agents and composite functional bacteria liquid respectively; the control system is used for receiving monitoring data; the control system is also used for displaying monitoring data and equipment operating states, and setting operating parameters by a user; the control system is also used for automatically adjusting medicament dosing amount, aeration flow and aeration pressure according to monitoring data and operating parameters set by the user. Through the design of the multifunctional well group, the medicament supply system and the aeration system, the hexavalent chromium contaminated groundwater can be simultaneously subjected to chemical reduction, biological reinforcement and adsorption fixation, so that the three processes are coordinated to realize rapid, efficient and long-acting remediation of the hexavalent chromium contaminated groundwater.
Owner:CHONGQING DERUN SIMBOND ENVIRONMENT REMEDIATION CO LTD
Preparation method of high-purity nicotine
The invention provides a preparation method of high-purity nicotine. The content of nitroso substances in an obtained nicotine finished product is lower than the PPB level, and the content of single heavy metals such as lead, cadmium, mercury and hexavalent chromium is also lower than the PPB level. The low-content nitroso substance concentration and heavy metal concentration can effectively reduce the harm of the synthesized nicotine to the human body, and the method provided by the invention can realize continuous industrial production of nicotine, and fills the blank of the demand of the market for high-purity L-nicotine.
Owner:HUBEI ZHENGRUI TECHNOLOGY CO LTD +1
An apparatus and method for upflow electrochemical treatment of wastewater containing hexavalent chromium
This invention discloses an upflow electrochemical treatment device and method for treating wastewater containing hexavalent chromium. The device includes a cylindrical inner reaction chamber and a double-layer reaction chamber. The inner reaction chamber contains a mesh-like ruthenium-iridium-titanium anode and a carbon fiber felt membrane cathode. The double-layer reaction chamber includes an external overflow chamber and an internal upflow chamber. The method includes the following steps: S1, preliminary preparation; S2, wastewater injection; S3, continuous wastewater treatment; S4, detection. This invention mainly uses an upflow electrochemical water purification membrane for wastewater treatment, which can efficiently reduce highly toxic hexavalent chromium to less toxic trivalent chromium, effectively reducing the toxicity of the wastewater. Simultaneously, it utilizes the oxygen released during the reduction of hexavalent chromium to achieve the simultaneous generation of hydrogen peroxide, improving resource utilization and reducing treatment costs.
Owner:CHANGZHOU UNIV
Green, environment-friendly and efficient vanadium extraction method
The invention discloses a green, environment-friendly and efficient vanadium extraction method, and relates to a roasting additive and a roasting process thereof, and the method is realized by the following steps: mixing vanadium slag and a calcium oxalate additive, roasting, and treating the roasted clinker with acid to obtain a vanadium ion-containing solution and low-solubility residues; and treating the vanadium-containing ion solution to obtain a vanadium product with high vanadium content. According to the method, vanadium in the vanadium slag can be efficiently and rapidly separated and purified, an existing vanadium extraction process is simplified, the yield of vanadium is increased, the temperature and time needed by roasting the vanadium slag through a traditional calcium method are reduced, the risk of percolation of vanadium extraction tailings through a traditional sodium method is reduced, and the problems that in the traditional vanadium slag vanadium extraction process, the vanadium extraction rate is low, energy consumption is high, and the process is complex are solved; no harmful waste is discharged in the whole process, and no hexavalent chromium leakage risk exists in the leached tailings. The method is simple in process, energy-saving, environment-friendly, high in operability and wide in application prospect.
Owner:SICHUAN UNIV
Method for pre-reducing and strengthening oxidation to extract chromium from chromium slag
This invention relates to the field of chromium slag resource utilization technology, specifically to a method for pre-reduction enhanced oxidation extraction of chromium from chromium slag, comprising: S1, mixing calcium-free roasted chromium slag, carbonaceous reducing agent, and sodium carbonate in a mass ratio of 1:(0.4~0.9):(0.05~0.25) and pressing them into shape to obtain a chromium slag preform; S2, under an inert atmosphere, reducing and roasting the chromium slag preform at 850~1050℃ for 30~150 min to generate sodium chromite, and cooling it to room temperature with the furnace to obtain a pre-reduced chromium slag mixture; S3, under an oxygen-containing atmosphere, oxidizing and roasting the pre-reduced chromium slag mixture at 850~1050℃ for 30~150 min to convert trivalent chromium into water-soluble hexavalent chromium compounds, and air-cooling it to room temperature to obtain a roasting product; S4, stirring and leaching the roasting product in an acidic solution, separating the solid and liquid to obtain a leaching residue and a leachate containing hexavalent chromium. The pre-reduction stage enables lattice reconstruction and micropore optimization, creating favorable reaction conditions for the subsequent oxidation stage, thereby significantly improving the oxidation conversion efficiency of chromium.
Owner:CHONGQING UNIV OF TECH
Method for detecting and analyzing heavy metal chromium in high-aluminum ore and red mud
PendingCN122042577AMaterial analysis by observing effect on chemical indicatorPreparing sample for investigationPtru catalystRed mud
The invention provides a method for detecting and analyzing heavy metal chromium in high-aluminum ore and red mud, and belongs to the field of mineral analysis and detection. The method comprises the following steps: melting a mixture of a sample to be detected and a strong alkaline flux to obtain a melt; extracting and dissolving the melt by using a dilute acid solution to obtain a leaching solution; a strong oxidant and a catalyst are added into the leachate, so that chromium ions in the leachate are oxidized into hexavalent chromium ions, and hexavalent chromium conversion liquid is obtained; adding an alkali carbonate solution into the hexavalent chromium conversion solution to adjust the pH value of the hexavalent chromium conversion solution to 8-10 to obtain a mixed solution; filtering the mixed solution to obtain a chromium-containing filtrate; and quantifying the total chromium content in the chromium-containing filtrate by adopting a spectrophotometric method. The detection and analysis method provided by the invention can ensure that chromium existing in lattices of the high-aluminum ore and red mud sample is completely released, and main matrix interference elements such as aluminum, iron, calcium and magnesium in the sample can be effectively separated, so that accurate determination of the total chromium content in the to-be-detected sample is realized.
Owner:TESTING TECHNOLOGY (ZHENGZHOU) CO LTD OF CHALCO
Method and kit for the detection of chromium-6 in a sample
A method for determining the presence of chromium-6 (Cr-6) in a solid sample is described, comprising the steps of contacting the solid sample with a destruction liquid under conditions in which the Cr-6 of the solid sample dissolves in the destruction liquid as a chromate, providing a test solution; subjecting the test solution obtained in step (1) to a specific Cr-6 detection reaction, under conditions in which the presence of Cr-6 is detected; and detecting whether the specific Cr-6 reaction occurred in step (2); wherein the destruction liquid comprises an oxidant, which has a standard electrode potential E0 higher than the chromate.
A Z-type heterojunction composite material, its preparation method and application
ActiveCN117816955BMaterial nanotechnologyTransportation and packagingHeterojunctionElectrostatic interaction
This invention belongs to the field of photoelectric active materials and photoelectric sensing analysis technology, specifically relating to a Z-type heterojunction composite material, its preparation method, and its application. The composite material uses Ti-MOF as a precursor, annealing to obtain carboxyl-functionalized p-type 2DTiO2@C nanocakes. Chemical reduction forms AuNPs in situ on the surface of the 2DTiO2@C nanocakes, obtaining p-type 2DTiO2@C / Au nanocakes. Amino-modified p-type 3D peony-shaped BiOI is added to the p-type 2DTiO2@C / Au nanocakes, and electrostatic interaction yields the 2DTiO2@C / Au / 3DBiOI Z-type heterojunction composite material. This invention uses a metal-organic framework template-assisted calcination method, chemical reduction, and electrostatic interaction to design and prepare the Z-type heterojunction composite material, improving photoelectric activity and achieving rapid, highly sensitive, accurate, and reliable detection of hexavalent chromium ions.
Owner:HENAN POLYTECHNIC UNIV
An apparatus and process for removing hexavalent chromium ions from water
This invention discloses an apparatus and process for removing hexavalent chromium ions from water, comprising: a positive electrode reaction chamber, a negative electrode reaction chamber, an electrocoagulation reaction chamber, and a sedimentation tank. The positive electrode reaction chamber contains graphite plates A and B, and is filled with brine. The negative electrode reaction chamber contains porous carbon material, with a sponge-structured graphite plate connected to the negative electrode of a DC power supply. Graphite plate C is laid flat at the bottom of the negative electrode reaction chamber and connected to graphite plate B. A buffer zone is connected to the electrocoagulation reaction chamber, which contains an array of iron electrodes. The iron electrodes at the two edges of the array are connected to the positive and negative electrodes of a second DC power supply. The bottom of the electrocoagulation reaction chamber is connected to the sedimentation tank. This invention requires only electricity and a small amount of iron to remove hexavalent chromium ions from water, significantly reducing the use of reducing agents, chemicals, acids, and alkalis in traditional hexavalent chromium treatment processes, and producing effluent with a salt content far lower than that of traditional treatment processes.
Owner:SHANGHAI TETRELS MATERIAL TECH CO LTD
Chromium-free passivator for copper bar for new energy automobile battery and preparation method of chromium-free passivator
PendingCN121826681AMetallic material coating processesCell component detailsChromium freeAutomotive battery
The invention relates to a chromate-free passivator for a copper bar for a new energy automobile battery and a preparation method of the chromate-free passivator, and belongs to the technical field of metal surface treatment.The chromate-free passivator comprises, by weight, 6-16 parts of organic azole compounds; 10 to 30 parts by weight of molybdate; 2-10 parts by weight of a silane coupling agent; 4 to 12 parts by weight of a water-soluble polymer; 1-6 parts by weight of an accelerant; 0.2 to 2 parts by weight of a surfactant; and the balance of deionized water. According to the chromium-free passivating agent for the copper bar for the new energy automobile battery and the preparation method of the chromium-free passivating agent, the prepared chromium-free passivating agent for the copper bar for the new energy automobile battery eliminates the harm of hexavalent chromium to the environment and operators from the source, completely meets the strict requirements of global green manufacturing and environmental protection laws and regulations, and has a wide application prospect. And support is provided for the concept of full-life-cycle environmental protection of new energy automobiles, the copper bar surface treatment industry is promoted to develop towards the environment-friendly and sustainable direction, and the advantage of remarkable environmental protection performance is achieved.
Owner:WUHU TRUCHUM ALLOY COPPER CO LTD
Ex-situ chemical reduction stabilization repair method for hexavalent chromium contaminated soil
The invention provides an ex-situ chemical reduction stabilization remediation method for hexavalent chromium contaminated soil, which comprises the following steps: collecting soil from a contaminated land parcel, airing, crushing, screening and uniformly mixing to obtain pretreated contaminated soil; testing the content of hexavalent chromium in the polluted soil, then adding solid calcium polysulfide into the polluted soil according to the molar ratio of the solid calcium polysulfide to the hexavalent chromium of (12-16): 1, and uniformly mixing; and after uniform mixing, spraying water into the polluted soil according to 15-20% of the total solid mass, and carrying out static maintenance. According to the stable remediation method, the remediation target value (the hexavalent chromium in the soil is lower than 5.7 mg / kg) is achieved on the third day of maintenance, the remediation effect is continuous and good, and rebounding does not occur.
Owner:河南省地质矿产勘查开发局第一地质环境调查院
Method for intensively fixing hexavalent chromium pollutants based on iron oxide in-situ vulcanization coupling organic matter
The invention relates to the field of water and soil pollution treatment, in particular to a method for reinforcing and fixing hexavalent chromium pollutants based on iron oxide in-situ vulcanization coupling organic matter, which comprises the following steps: step 1, injecting a vulcanizing agent into a hexavalent chromium polluted area, so that in-situ iron oxide minerals are subjected to vulcanization modification to generate modified minerals; 2, a natural organic acid solution is injected and reacts with the modified minerals, the fixing efficiency on hexavalent chromium is enhanced, and an iron sulfide oxide mineral-organic composite repairing material is generated in situ; and 3, the iron sulfide oxide mineral-organic composite repairing material reacts with hexavalent chromium, trivalent chromium precipitates are generated, and long-acting fixation of hexavalent chromium is achieved. The remediation efficiency and the application range of hexavalent chromium are remarkably improved, meanwhile, the method has the advantages of being simple and convenient in process, low in cost, environmentally friendly and the like, the method is particularly suitable for large-scale site remediation and practical engineering application, and a reliable technical means is provided for soil and underground water chromium pollution treatment.
Owner:SHANXI XINYEJI SCIENCE & TECHNOLOGY INNOVATION IND DEVELOPMENT CO LTD
An engineered bacterium expressing a sqr gene and application thereof in aerobic remediation of hexavalent chromium pollution
PendingCN122256392AMaterial nanotechnologyTreatment using aerobic processesBiotechnologyHeterologous
This invention discloses an engineered bacterium expressing the sqr gene and its application in aerobic remediation of hexavalent chromium pollution. The construction method of the engineered bacterium includes the following steps: S1. Constructing the pEcgRNA-sqr plasmid; S2. Obtaining donor DNA; S3. Preparing electrocompetent cells; S4. Co-transforming the pEcgRNA-sqr plasmid and donor DNA fragment into the electrocompetent cells, performing resistance screening, and obtaining engineered bacteria integrating the sqr gene. This invention utilizes the constructed engineered bacterium expressing SQR coupled with nano-ferrous sulfide to establish a "sulfur metabolism-FeS regeneration" cycle system, accelerating Cr(VI) reduction. Under aerobic / microaerobic conditions, the removal rate of 50 mg / L Cr(VI) in 1 hour can reach over 95%, while simultaneously alleviating the competitive pressure of intracellular reducing power caused by heterologous expression of the sqr gene, improving remediation efficiency and strain growth stability, and achieving a synergistic effect of biochemistry.
Owner:SOUTH CHINA UNIV OF TECH
Ion exchange material for treating hexavalent chromium ions in wastewater and preparation method thereof
The invention provides an ion exchange material for treating hexavalent chromium ions in wastewater and a preparation method of the ion exchange material. The preparation method comprises the following steps: placing an inorganic porous carrier in a vacuum reaction chamber, vacuumizing to below 1kPa, keeping the vacuum degree of the reaction chamber for more than 1h, and emptying air in pores of the inorganic porous carrier; completely dissolving a polymer containing a weakly alkaline ion exchange group in an organic solvent to obtain an organic phase; introducing the organic phase into a vacuum reaction chamber through suck-back, so that the organic phase permeates into pores of the inorganic porous carrier, and keeping the impregnation state for more than 4 hours to obtain an intermediate product; and evaporating the intermediate product to remove redundant organic solvent, cooling, washing and drying to obtain the ion exchange material. Compared with an existing traditional material, the prepared ion exchange material has more excellent comprehensive performance in the aspects of adsorption capacity, adsorption rate and the like.
Owner:MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
Composite passivator and method for repairing selenium-rich soil polluted by hexavalent chromium
The invention belongs to the field of soil remediation, and relates to a composite passivator and a remediation method for selenium-rich soil polluted by hexavalent chromium, and the composite passivator is formed by mixing modified biomass charcoal, calcium silicate, kaolin and activated sludge. The invention provides the composite passivator which has an obvious passivation effect, can effectively improve the soil fertility and has a certain remediation effect on the heavy metal contaminated soil, and the remediation method for the selenium-rich soil contaminated by hexavalent chromium.
Owner:陕西省地质调查实验中心
Shock absorber and method for manufacturing shock absorber
PendingUS20260146357A1SpringsSprings/dampers functional characteristicsPhysical chemistryCrystalline materials
Provided is a shock absorber in which trivalent chromium is used to achieve both high hardness and low frictional force at a high level without using hexavalent chromium which is suspected of causing damage to the human body and the environment, and a method for manufacturing the shock absorber.A shock absorber (100) of the present invention includes: a cylinder (1) which is filled with hydraulic oil (3); a piston rod (2) which is movable in the cylinder (1); and an oil seal (8) which is fixed to the cylinder (1) and slides on the piston rod (2), in which a hard layer mainly containing chromium obtained from a trivalent chromium plating bath is provided on a surface of the piston rod (2), and the hard layer contains both a crystalline material and an amorphous material, and also contains an additive other than chromium.
Owner:ASTEMO LTD
Ferrous sulfide particles with shells as well as preparation method and application of ferrous sulfide particles
PendingCN121972136AGood dispersionHigh reactivityOther chemical processesWater contaminantsCelluloseCarboxymethyl cellulose
The invention relates to the technical field of land pollution treatment, solves the problem that in the prior art, when a large-area medium polluted by hexavalent chromium is treated, the addition amount of ferrous sulfide is prone to being inaccurate, and consequently the remediation effect is not ideal, and provides ferrous sulfide particles with shells and a preparation method and application of the ferrous sulfide particles. The prepared ferrous sulfide particles with the shells can keep efficient removal of chromium within the pH value range of 5-9, the problem that the adsorption behavior of a traditional model in a low-chromium-concentration area is difficult to predict is effectively solved by means of a correction adsorption model with higher fitting precision, and therefore the actual demand quantity of target repairing liquid can be accurately predicted, and the application prospect is wide. The target repairing liquid can be injected more accurately, and excessive or insufficient injection is avoided. After hexavalent chromium is reduced into trivalent chromium by ferrous sulfide, the trivalent chromium and carboxymethyl cellulose can form a stable chelate, and zero-valent sulfur can also form a compact passivation layer on the surface of a polluted medium, so that the trivalent chromium is prevented from being reoxidized, and long-term stable repair of hexavalent chromium is realized.
Owner:NANYAN ECOLOGICAL ENVIRONMENT RES LAB (SHENZHEN) CO LTD +2
Visible light catalyst, method for preparing the same, and use thereof
PendingCN122141680AWater/sewage treatment by irradiationWater contaminantsPtru catalystNanocomposite
The application discloses a visible light catalyst and a preparation method thereof. Firstly, ZnFe2O4 nanoparticles are prepared by a liquid phase mixing-evaporating solvent-calcining method; then the ZnFe2O4 nanoparticles are uniformly dispersed in an aqueous solution containing different mass of glucose, the glucose is converted into hydrothermal carbon (HC) through a hydrothermal reaction, and the HC is combined with the ZnFe2O4 nanoparticles to obtain a series of HC / ZnFe2O4 nanocomposites. The method is simple and easy to implement, raw materials are easy to obtain, and the cost is low; the nanocomposite has high visible light catalytic activity on the reduction of bromate and hexavalent chromium in water, and can be applied to treating bromate and hexavalent chromium pollutants in water as a new visible light catalyst.
Owner:JIANGSU GUOJIAO CHEM TECH
Shock absorber and method for manufacturing shock absorber
ActiveUS12553143B2SpringsSprings/dampers functional characteristicsPhysical chemistryCrystalline materials
Provided is a shock absorber in which trivalent chromium is used to achieve both high hardness and low frictional force at a high level without using hexavalent chromium which is suspected of causing damage to the human body and the environment, and a method for manufacturing the shock absorber.A shock absorber (100) of the present invention includes: a cylinder (1) which is filled with hydraulic oil (3); a piston rod (2) which is movable in the cylinder (1); and an oil seal (8) which is fixed to the cylinder (1) and slides on the piston rod (2), in which a hard layer mainly containing chromium obtained from a trivalent chromium plating bath is provided on a surface of the piston rod (2), and the hard layer contains both a crystalline material and an amorphous material, and also contains an additive other than chromium.
Owner:ASTEMO LTD
Method for removing heavy metal chromium ions in wastewater
PendingCN122059572AIon-exchanger regenerationSpecific water treatment objectivesIndustrial waste waterDC - Direct current
The invention discloses a method for removing heavy metal chromium ions in wastewater, and belongs to the technical field of industrial wastewater treatment and heavy metal pollution treatment. The method comprises the following steps: constructing a packed bed electrodialysis system in which a light chamber is filled with an ion exchanger, sequentially introducing chromium-containing wastewater to be treated into the light chamber, respectively introducing a sodium sulfate aqueous solution into a concentrated chamber and a pole chamber, applying direct current, and adopting frequent pole reversal operation. According to the method, deep removal is achieved through selective adsorption of the ion exchanger on chromium ions, efficient separation and concentration of the chromium ions are achieved through an ion channel constructed by the direct-current electric field, the ion exchange membrane and the ion exchanger, and meanwhile in-situ regeneration and reuse of the ion exchanger are achieved by periodically switching the direction of the electric field. The continuous advanced treatment of the chromium-containing wastewater can be realized, the hexavalent chromium concentration of the effluent is stably lower than 0.5 mg / L, the chromium recovery rate exceeds 90%, secondary hazardous waste pollution is avoided, the operation energy consumption is low, the cost is low, and large-scale industrial application is easy.
Owner:INSTITUTE OF PROCESS ENGINEERING CHINESE ACADEMY OF SCIENCES
Method for in-situ remediation of hexavalent chromium contaminated soil and application thereof
The invention relates to a method for in-situ remediation of hexavalent chromium contaminated soil and application of the method, according to the method, a nutritional additive solution and a sulfate reduction biological agent are added into the hexavalent chromium contaminated soil, and a nutritional additive contains organic acid salt. According to the method, the organic acid salt serves as a chelating agent to enable insoluble hexavalent chromium to be dissolved out of soil particles, meanwhile, the organic acid salt serves as a nutrition additive to promote reproduction and growth of sulfate reducing bacteria, sulfate is reduced into negative bivalent sulfur through the sulfate reducing bacteria, and the dissolved hexavalent chromium is reduced into trivalent chromium through the negative bivalent sulfur; finally, the purpose of treating the hexavalent chromium contaminated soil is achieved.
Owner:BEIJING BOSEN ENVIRONMNETAL TECH CO LTD