83results about How to "Avoid environmental risks" patented technology

The invention discloses a graphene oxide/polymer composite antibacterial material and a preparation method thereof. The composite antibacterial material is characterized in that a polymer is subjected to surface modification and then is combined with graphene oxide dispersed in water, thus obtaining a graphene oxide antibacterial coating bonded on a polymer matrix, wherein the thickness of the antibacterial coating is 1 to 50nm. The preparation method of the graphene oxide/polymer composite antibacterial material comprises the following steps: firstly, performing ultrasonic cleaning on the polymer; secondly, performing surface modification on the polymer subjected to ultrasonic cleaning; thirdly, immersing an activated polymer matrix into a coupling agent solution and soaking; fourthly, taking out the soaked polymer, leaching with deionized water, then putting into a graphene oxide suspension liquid for 0.2 to 24 hours, taking out, leaching and naturally drying in air to obtain the graphene oxide/polymer composite antibacterial material. The invention designs and prepares the composite antibacterial material by taking graphene oxide as an antibacterial ingredient; the composite antibacterial material has a transparent antibacterial layer, is excellent in antibacterial property and is firmly bonded with the matrix.

The invention provides a high strength stone plastic floor and manufacturing method thereof. The stone plastic floor comprises a PVC substrate and a surface layer on a surface of the PVC substrate. Compositions of PVC substrate comprise: PVC powder from 20 to 35 weight percent, calcium carbonate from 60 to 70 weight percent, stabilizer from 1 to 3 weight percent, flexibilizer from 1 to 3 weight percent, lubricants from 0.4 to 1 weight percent, and colorant from 0.4 to 1 weight percent. The high strength stone plastic floor does not contain plasticizer so environmental risks are completely avoided. The contractility is good. The high strength stone plastic floor is resistant to high temperature and direct sunlight. Compared with conventional stone plastic floor, lifespan of the present invention is prolonged. The PVC substrate of the floor can be combined with different layers and can integrate different advantages of other floors.

The rape transgenic method of the present invention adopts the in-situ reproduction organ as transgenic receptor. On the basis of cytological observation of pollinated rape style and ovary, the transforming time is determined. The transformation includes cutting off the style head, dropping exogenous DNA solution, transforming the reproductive cell with the gene carrying exogenous gene and glufosinate resistance marker gene to obtain transgenic T1 generation zygocyte in the transformation period; and screening the T1 generation seedling with low concentration glufosinate solution to obtain transgenic positive rape plant. The present invention has transgenic efficiency of 2-10 %, high transformation flux, low cost, less work, no genotype dependence and other advantages.

The invention discloses a method for recovering valuable metals by comprehensively treating high-iron and low-germanium zinc oxide calcine and zinc sulfite. The method comprises the following steps: 1) primary leaching of zinc oxide calcine; 2) secondary leaching of zinc oxide calcine; 3) zinc sulfite analysis and ferric reduction; and 4) tannin germanium precipitation. In the process of recovering valuable metals by comprehensive treatment, the zinc sulfite analysis and the reduction of ferric ions, namely ferric sulfate in a solution into ferrous ions, namely ferrous sulfate are completed at one step by using a simple and convenient method, so that resources are sufficiently recycled, and the production cost is reduced; and the problems that zinc and germanium are recovered by analyzing zinc sulfite into a zinc sulfate solution and the ferric ions in a system for recovering zinc and germanium from the zinc oxide calcine cannot form an open path because of being enriched are simultaneously solved, meanwhile, the filtering performance for liquid-solid separation of the whole production system is also improved to ensure that the solution is clear and has no suspended matters, and consumption of tannic acid can be reduced and the grade of a germanium concentrate can be improved in the tannin germanium precipitation process.

The invention discloses a combined leaching-stabilization rehabilitation method for soil contaminated by chromium residue. The method specifically comprises the following steps: remediation preparation, specifically, a leachate guide drainage structure is constructed, and the soil contaminated by the chromium residue is dredged, transported, broken, screened and piled; leaching remediation, specifically, a leaching agent is evenly distributed on the surface of a soil heap, the leaching agent separates chromium contaminants in the soil from top to bottom, a discharge port of the leachate is opened and the leachate is collected to a detoxification tank, hexavalent chromium is reduced and trivalent chromium is precipitated, and supernatant is used for circulating spray; and stabilization rehabilitation, specifically, the discharge port of the leachate is closed, stabilizer solution is added to a leaching tank until the soil is submerged, and the chromium contaminants remaining in the stabilized soil are soaked and stabilized by the stabilizer. By means of the combined leaching-stabilization rehabilitation method for the soil contaminated by the chromium residue, the leaching process and the stabilization process are organically combined, first, the total amount of the contaminants in the soil contaminated by chromium residue is reduced by spraying the leaching agent, and then theresidual contaminants are further removed by soaking the stabilizer, so that the amount of stabilizer addition is greatly reduced, and the environmental risk of the soil contaminated by the chromium residue is effectively eliminated.

The invention relates to the technical field of inorganic chemical industry and specifically relates to a technology for enriching phosphate concentrate and recycling calcium carbonate and magnesium hydroxide from middle-low grade phosphate rock or phosphate tailing simultaneously. According to the technology disclosed by the invention, middle-low grade phosphate rock or phosphate tailing is utilized as a main raw material to enrich phosphate concentrate and recycle calcium carbonate and magnesium hydroxide simultaneously, so that the problems that an existing twice reverse-flotation phosphateconcentrate enriching technology for phosphate is low in phosphorus recovery rate and discharges a lot of tailing to bring environment-friendly risk. Phosphate or phosphate tailing is roasted at thetemperature of 700 to 1200 DEG C, so that calcite and dolomite are decomposed, and contained fluorapatite (Ca5F(PO4)3) is not decomposed; by means of twice ammonium nitrate leaching, phosphate concentrate, high-quality light calcium carbonate and high-purity magnesium hydroxide can be finally obtained; calcium and magnesium can be effectively recycled, and a good economic benefit is achieved; meanwhile, the method can prevent new tailing from generating, and the problems of a lot of land occupancy, environment pollution and the like caused by a lot of phosphate tailing accumulation are effectively solved.

The invention discloses a method for controlling transgene flow by using gene split, and belongs to the technical field of genetically modified organism safety. The method is characterized in that: a complete target gene is splited into an N-terminal sequence and a C-terminal sequence; the N-terminal sequence and the C-terminal sequence are respectively ligated with the gene sequence of the N-terminal splicing domain of the Intein gene and the gene sequence of the C-terminal splicing domain of the Intein gene to form a fusion gene A and a fusion gene B; the fusion gene A and the fusion gene B are transferred into a nuclear genome of a receptor plant through technical means of agrobacterium tumefaciens transformation and hybridization, or the fusion gene A is transferred into the nuclear genome while the fusion gene B is transferred into the chloroplast genome to obtain the gene-splited transgenic plant; after the two fusion genes are expressed in the transgenic plant, two inactive protein fragments are reassembled into active and complete protein in the chloroplast genome or the nuclear genome through Intein-mediated protein-splicing function. According to the method provided by the present invention, environment risk due to the transgene flow can be reduced.

The invention discloses a power transmission and transformation engineering project electromagnetic environment prediction method based on automatic recognition of an environment sensitive target. The method includes: reading geographic information corresponding to a power transmission and transformation project, determining the shape of a generated buffering area according to a given spatial entity, and utilizing a vector algorithm and a stacking method to determine an environment sensitive area; utilizing an image method to calculate equivalent charge on a power transmission line so as to calculate an electric field generated by the equivalent charge, utilizing an equivalent charge method to calculate intensity of a high-voltage power transmission line spatial working frequency electric field, and predicting a working frequency electric field of the determined environment sensitive area; according to quasi-static characteristics of electromagnetic performance under working frequency condition, applying an ampere's law to stack calculation results by vector, and calculating to acquire magnetic field strength around a lead and a prediction value of a working frequency magnetic field of the environment sensitive area. By the method, when the environment sensitive area of the power transmission and transmission project is modified or removed, electromagnetic environment parameters that the environment sensitive area of the power transmission and transformation project is about to face can be predicted for corresponding rectification to avoid disputes.

The invention discloses a special compound fertilizer for macadimia nuts as well as a package fertilizer and a fertilization method of the package fertilizer. The compound fertilizer comprises N, P2O5and K2O components with a weight ratio of (18-21.5):(3.6-4.3):(15-17.2), wherein the total nutrient content of N, P2O5 and K2O is 36.6-43%. The package fertilizer comprises a pre-flowering fertilizer, a fruit-protecting and fruit-strengthening fertilizer and an oil accumulation fertilizer which are all compound fertilizers, and a post-fruiting fertilizer composed of the compound fertilizer, an organic fertilizer and a micro-element fertilizer, and the micro-element fertilizer comprises borax, ferrous sulfate, magnesium sulfate and zinc sulfate heptahydrate. An application method comprises thefollowing steps: digging fertilization ditches along a crown drip line, uniformly applying the package fertilizer, covering the ditches with soil and conducting watering. The compound fertilizer canmeet the growth and development nutrient requirements of macadimia nuts, and resource waste and environmental risks are avoided; the package fertilizer and the fertilization mode can give play to thepotential of efficient nutrient utilization of root systems, and the fertilizer utilization rate is effectively increased; and healthy tree body building and sustainable orchard construction can be facilitated.

The invention belongs to the field of resource recovery and aims to provide a method for separating potassium chloride, sodium chloride and magnesium chloride from magnesium electrolysis residues. The method comprises the following steps: (a) infiltrating the magnesium electrolysis residues to obtain an infiltration liquid; (b) filtering the infiltration liquid to obtain a primary filtrate and primary slurry; (c) adding water into the primary slurry to obtain a secondary filtrate and secondary slurry, adding hydrochloric acid into the secondary slurry to obtain a tertiary filtrate and tertiary slurry, evaporating and crystallizing the tertiary filtrate to obtain magnesium chloride hexahydrate; and (d) adding an impurity removing agent into the primary filtrate, filtering the primary filtrate to obtain a quaternary filtrate and quaternary slurry, evaporating and crystallizing the quaternary filtrate to obtain a mixture of sodium chloride and potassium chloride. The method provided by the invention is simple in steps, and the obtained product can be returned to the original production process to use, and resources can be recycled.

The invention discloses a flue gas desulfurization system using calcium carbide slag/slurry. The flue gas desulfurization system comprises a desulfurization tower, a flue gas pipeline, an exhaust pipe, a first conveying pipe entering slurry at the bottom of the desulfurization tower and used for conveying waste sulfuric acid, a second conveying pipe entering the slurry at the bottom of the desulfurization tower and used for convey oxidizing air, a desulfurization slurry tank, a calcium carbide slurry supplementing pipe used for adding calcium carbide slurry into the desulfurization slurry tank, a third conveying pipe used for conveying slurry in the desulfurization tower to the desulfurization slurry tank, a first spraying device and a second spraying device both connected with the desulfurization slurry tank and used for conveying desulfurization slurry to the desulfurization tower for spray absorption of sulfur dioxide, a third spraying device connected with the liquid conveying pipeof the second spraying device, a fourth spraying device arranged at the inner lower part of the desulfurization tower and used for promoting oxidation of calcium sulfite, a partition plate arranged in the desulfurization tower and provided with a riser, and a demisting device arranged at the top of the desulfurization tower. The carbide slag/slurry flue gas desulfurization system is high in desulfurization efficiency and high in purity of generated calcium sulfate.

The invention provides a refining method of epoxy resin, and belongs to the field of chemical refining. In the staged refining process, the content of water in a system is reduced by pumping negative pressure to a certain vacuum degree and removing water and an organic solvent in the system, so that the reaction is promoted to proceed towards a crude epoxy resin dehydrochlorination ring-closure reaction, the content of hydrolyzable chlorine in the crude epoxy resin is remarkably reduced, by using a phase transfer catalyst and controlling the vacuum degree and temperature of each refining stage, the utilization rate of sodium hydroxide participating in ring-closure reaction is increased, and the use amount of sodium hydroxide is reduced, so that excessive condensation side reaction is avoided, the generation of aged resin is reduced, the content of organic matters in the generated high-salinity wastewater is reduced, and the production treatment cost and raw material consumption are reduced; and the TOC value in the generated high-salinity wastewater is as low as 3434ppm, the aged resin accounts for 0.8% o of the total amount of the resin, and the content of hydrolyzable chlorine in the epoxy resin product is as low as 142 ppm.

The invention discloses an underwater production system and an underwater production method of fluidized mining based natural gas hydrate. The underwater production system comprises an underwater central collecting system, a slurry crushing and decomposing system, an underwater separating system, a transmission subsystem and a umbilical system. Compared with the prior art, the fluidized mining based natural gas hydrate underwater production system has the following benefits: according to the reservoir forming and mining characteristic of natural gas hydrate in, and by combining with the actualproblem of slurry lifting, the invention discloses a natural gas hydrate fluidized mining based underwater collecting, discomposing and sub-transporting production system. On one hand, the system reduces the slurry lifting risk in large height difference by a treatment facility from underground to the sea and improves the natural gas collecting efficiency; on the other hand, the system is adaptedto centralized collecting and treatment after underground multipoint dispersing production; and in addition, circulating suspension liquid is utilized to carry out suspension lifting on residual mudand sand after underground decomposition for further treatment on the sea to realize all-dielectric sealing collection.

The invention discloses a machining emulsified waste liquid reduction treatment system, and the system comprises an emulsified raw liquid box, a filter, a three-stage series advanced oxidation box, reverse osmosis water treatment equipment, a water production tank and a low-temperature evaporator, wherein the emulsified raw liquid box is connected with the three-stage series advanced oxidation box through the filter; the three-stage series advanced oxidation tank is connected with the reverse osmosis water treatment equipment, the water production tank and the low-temperature evaporator are respectively connected with the reverse osmosis water treatment equipment, and the water production tank is connected with the low-temperature evaporator. The invention further discloses a reduction treatment method of the system for the emulsified waste liquid. According to the system, the machining emulsified waste liquid is sequentially subjected to sedimentation, demulsification, reverse osmosis filtration, step-by-step concentration and the like, so that the emission amount of emulsified waste liquid of an enterprise can be reduced by more than 90% while the standard discharge of concentrated liquid obtained by effluent can be efficiently ensured in an energy-saving manner, the treatment cost is remarkably reduced, and the system has multiple benefits of environmental protection, sustainability, recycling and the like, and is suitable for industrial production. The method is a brand-new processing mode for reducing the machining emulsified waste liquid.

The invention discloses a manual operation liquid discharge device. The device comprises an upper rotary small arm and a lower rotary small arm which are made of pipes, wherein a first grade universal joint and a second grade universal joint are respectively connected at two ends of the upper rotary small arm through 90-degree elbows, the second grade universal joint is connected with the lower rotary small arm through the 90-degree elbow, the lower rotary small arm is connected with a manual control ball valve through the 90-degree elbow, the manual control ball valve is connected with a lifting device, and a rotary large arm is connected between the first grade universal joint and the second grade universal joint. The manual operation liquid discharge device not only can rapidly fill a plurality of medicament barrels (jars) at different positions, but also can avoid splashing caused by falling off of the joint of the pipe so as to effectively prevent human body hurt and environment contamination in the liquid discharge process, can run stably and continuously, and has reliable safety.

The invention discloses a corrosion-resistance composite metal material. The material is prepared from, by mass, 1.0-1.5% of Mn, 0.5-1.0% of Ti, 0.5-1.0% of Ca, 0.5-0.8% of La, 0.3-0.5% of Ni, 0.05-0.08% of Y, 0.5-1.0% of basalt and the balance Al. In addition, the invention further provides a preparation method of the corrosion-resistance composite metal material. According to the corrosion-resistance composite metal material and the preparation method thereof, Mn, Ti, Ca, La, Ni, Y and basalt are adopted for preparing the corrosion-resistance composite metal material. The performance and synergistic effect of the materials are used for preventing corrosion, the composite metal material with excellent corrosion-resistance performance is prepared, the environment risk caused by adopting achemical plating technology for preventing corrosion is also avoided, and the material has wide application prospects.

Air-cured batting includes a nonwoven web. The batting contains 75 to 97.5 wt % of fiber mixture, and 2.5 to 25 wt % of resin comprising a cross-linked copolymer of butyl acrylate and methyl methacrylate, wherein the resin is present on a first surface of the batting, and on a second surface of the batting, the second surface being parallel to the first surface, and wherein the resin is adhered to fibers of the fiber mixture, thereby forming a bonded structure, such that, by virtue of the resin, the air-cured batting has structural integrity that imparts handleability of the batting in sheet form. Articles comprising the air-cured batting and methods of making the air-cured batting are also provided.

The invention discloses a preparation method of a heavy metal ion stabilizer for dehydrating electroplating sludge. By taking tetramethyl ethylenediamine as a raw material, potassium hydroxide as an initiator, carbon dioxide as an additive and ultrapure water as a solvent, the preparation method is used for preparing the heavy metal ion stabilizer for dehydrating electroplating sludge by virtue of S<-> and k<+> replacement reaction. The stabilizer prepared by the preparation method disclosed by the invention not only can be used for overcoming the problems that the existing electroplating sludge is high in water content, and secondary pollution treatment is caused due to dissolution of a great deal of heavy metal ions in a hydrating process, but also has the advantages of a simple preparation process, no high-temperature high-pressure requirements in a reaction kettle, no emission of three wastes, and the like.

The invention discloses a power grid enterprise hazardous waste centralized storage center site selection and path planning method. The method comprises the following steps: counting power supply company information of urban districts and county districts under the jurisdiction of a province; carrying out statistics on hazardous waste disposal related information of each power supply company; collecting related information of the hazardous waste collection network and the alternative point of the centralized storage center; and determining the site selection, the construction area and the path planning of the hazardous waste centralized storage center by establishing and solving the model. According to the method, a power grid enterprise can scientifically and reasonably plan the position layout of the regional centralized storage center, and a transportation path from a collection network point to the centralized storage center is defined, so that the construction and operation cost of the centralized storage center is reduced to the greatest extent, and a hazardous waste disposal management system is optimized.

The invention relates to a synthesis method of a 2, 4-dichlorophenoxyacetic acid compound, and relates to the technical field of organic synthesis. The synthesis method of the 2, 4-dichlorophenoxyacetic acid compound is to solve the problems of many by-products existing in synthesis method of the 2, 4-dichlorophenoxyacetic acid compound in prior art, low conversion of phenol, incomplete conversion, environmental pollution resulted, the use of a large number of solvents, production of a large amount of wastewater, high cost, complex technology, high environmental risk, and being not conducive to industrial production. According to the synthesis method of the 2, 4-dichlorophenoxyacetic acid compound, in the synergistic action of anhydrous carbonate weak base and a catalyst, performing condensation of 2, 4-dichlorophenol with halogen acetate, and 2, 4-dichlorophenoxyacetic acid is obtained directly by hydrolysis and acidification. The process of the synthesis method of the 2, 4-dichlorophenoxyacetic acid compound is accomplished by condensation, hydrolysis and acid hydrolysis in one pot without any solvent and using anhydrous carbonate weak base to react with 2, 4-dichlorophenol can effectively inhibit the hydrolysis of chloroacetate, improve the condensation conversion, reduce the content of free phenol, keep a yield over 97% an active ingredient more than 98%, and free phenol content in 50-100 ppm.

The invention relates to a treatment system for poisoning of wet desulphurization slurry. The treatment system comprises a desulfurization absorption tower, wherein a gas inlet pipeline is arranged onthe side wall of the desulfurizing absorption tower; a spray header is arranged in the desulfurization absorption tower; a first circulating pipeline is arranged on the side wall of the desulfurization absorption tower; one end of the first circulating pipeline is connected with the lower part of the desulfurization absorption tower; the other end of the first circulating pipeline is connected with the spray header; an absorption liquid adding pipeline is arranged on the side wall of the desulfurization absorption tower; the desulfurization absorption tower is connected with a sulfur slurry poisoning treatment system; the sulfur slurry poisoning treatment system comprises a chemical storage tank; a stirrer is arranged in the chemical storage tank; a chemical feeding pipeline is arranged at the upper end of the chemical storage tank; a second circulating pipeline is arranged on the side wall of the chemical storage tank; a branch is led out of the second circulating pipeline; and the branch is connected with the absorption liquid adding pipeline. According to the invention, up-to-standard emission of sulfur dioxide in flue gas is ensured, and secondary pollution caused by storage and outward transportation of muddy gypsum is avoided.