193results about How to "Improve chelation ability" patented technology

The invention discloses a method for reducing the content of cadmium in middle rice. The method includes the following steps that after middle rice of the first year is harvested, middle rice straw is returned to the field directly, and tillage is conducted so that the middle rice straw can be evenly mixed with soil; hyperaccumulation plants are planted in a paddy; after the hyperaccumulation plants are removed from March to May in the second year, soil heavy metal passivator is scattered on the surface of soil of the paddy; tillage is conducted, and base fertilizer is applied 3-5 days later; tillage is conducted, and rice is transplanted; during planting of rice, a foliar resistance control agent is sprayed in the later tillering stage and the booting stage of rice respectively, wherein spraying time interval is 5-10 days; field drying is conducted in the later tillering stage, natural drying is conducted in the maturation stage, and flooding irrigation is conducted in other development stages. According to the method, crop production and straw resource utilization are not affected, the dual targets of reducing the paddy soil cadmium content and reducing the rice cadmium content are achieved under the combined action of plant extraction, soil passivation, foliar resistance control and water management, and effects are more remarkable compared with other combination technologies.

The invention discloses a method for synthesizing a modified sodium alginate flocculating agent and an application of the flocculating agent. The method comprises the following steps of: reacting partially oxidized sodium alginate and a chelating agent thiosemicarbazide with a functional group in an aqueous solution to obtain a biodegradable natural high polymer flocculating agent. The method mainly comprises two reaction processes: (1) oxidizing the sodium alginate by using sodium periodate, and preparing the partially oxidized sodium alginate with a dialdehyde structure, wherein the oxidation degree is 68.2 percent; and (2) dissolving the oxidized sodium alginate in a phosphate buffer solution with the pH of 7.0 to prepare a uniform solution, adding the thiosemicarbazide to the uniform solution, reacting for 4 hours to generate a Schiff base, and adding NaBH4 to generate stable amine. The method is simple and easily controllable in process, low in cost and easy to popularize and apply, and raw materials are easily obtained. Nitrogen and sulfur elements are introduced into sodium alginate subjected to chemical modification, and the adsorption capacity and removal rate of the sodium alginate flocculating agent on heavy metal ions in sewage are greatly improved. The flocculating agent is biodegradable, and secondary pollutants are avoided.

The invention provides mineral flotation collectors, namely sulfur ammonia ester thiourea composite-group compounds. The structural formula of the collectors is as follows, wherein R1 represents C1 to C8 alkyl, acyl groups of which the general formula is R3-C(=O)- or ester groups of which the general formula is R40-C(=O)-; R3 and R4 in the structural formula represent C1 to C8 alkyl respectively;and R2 represents C2 to C9 alkylene. Due to a plurality of coordination atoms and coordination groups in collector molecules, the sulfur ammonia ester thiourea composite-group compounds serving as flotation collectors can enhance the flotation, separation and extraction of nonferrous metal ores and precious metal ores and improve flotation efficiency, metal recovery rate and other characteristics.

The invention discloses a method for preparing a full nutritional high nitrogen type liquid flush fertilizer by monosodium glutamate waste liquid and a product, and belongs to the technical field of production of liquid flush fertilizers. The preparation process comprises the following steps of: 1, performing quadruple effect concentration for monosodium glutamate waste liquid; 2, adding ammonia water in a certain proportion to the concentrated liquor, and adjusting pH value through neutralization reaction; 3, mixing the mixed liquid, urea, potassium sulphate, and ammonium polyphosphate saturated liquid in volume percentage of 50-60%, 15%, 15% and 10%; and 4, adding magnesium sulfate, zinc sulfate, ferrous sulfate and borax saturated liquid in volume percentage of 1-2% in the mixed liquid for chelation reaction. According to the invention, three nitrogen adding processes are performed, and the full nutritional high nitrogen type (25% of N) fertilizer is prepared through chelation reaction of amino acids in the monosodium glutamate waste liquid and ammonium polyphosphate and trace elements added. According to the invention, the deficiency that precipitates are produced by phosphate radicals and medium trace elements and the liquid flush fertilizer in low in nitrogen is overcome, so that the process is simple and the cost is low. Field trail results of greenhouse vegetable show that the yield-increasing effect is remarkable and the quality of vegetables is remarkably improved.

The invention relates to a method for preparing a chitosan separation medium suitable for protein purification, which comprises the following steps of: (1) dispersing acetic acid solution of chitosan into liquid paraffin with stirring to form chitosan particles in the presence of cyclohexane serving as a porogen and a small amount of span80, and further cross-linking the chitosan particles to form a chitosan skeleton under the action of glutaraldehyde serving as a cross-linking agent; (2) swelling the chitosan skeleton, and reacting a hydroxyl group on the chitosan skeleton with epoxy chloropropane in dimethyl sulfoxide (DMSO) / NaOH mixed solution to introduce an epoxy group into the chitosan skeleton so as to obtain a grafted chitosan skeleton; and (3) adding iminodiacetic acid (IDA) / NaOHmixed solution into the grafted chitosan skeleton, reacting at the temperature of between 20 and 80 DEG C for 1 to 10 hours, and performing suction-filtration to obtain the chitosan separation medium. The chitosan separation medium solves the leakage problem of metal ions to a large extent, has the advantages of process stability, high repeatability and the like, and is suitable for mass production.

The present invention discloses polishing liquid for grinding and polishing optical lithium niobate wafer. The polishing liquid consists of silica sol 30-90 vol%, organic amine alkali 1-10 vol%, inorganic alkali 1-5 vol%, activator 0.5-5 vol%, chelating agent FA / O 0.5-5 vol%, and deionized water for the rest. Under CMP and high pH condition, lithium is formed into stable complex and water soluble niobate to raise polishing efficiency and surface quality. The present invention has organic alkali and lithium niobate surface matter to form soluble amine salt easy to separate from the reaction surface, and this avoids the increase in the abrasive granularity and polishing liquid viscosity to ensure no scoring, high flatness and no adsorbate.

The invention relates to a ramie planting method for restoring soil contaminated by heavy metal cadmium, and belongs to the technical field of crop cultivation and agricultural environment conservation and repair, and particularly relates to the ramie planting method for restoring the soil contaminated by the heavy metal cadmium. In recent years, the phytoremediation technology gradually becomes ahot spot which is concerned by the public and the scientific academia. However, the biomass of the heavy metal super-enriched plant is generally small, the economic value is not large, and the contradiction between ecological restoration and production continuity is difficult to harmonize. The invention provides the novel ramie planting method for restoring the soil contaminated by the heavy metal cadmium. According to the method, the ramie variety can be popularized in a large area, so that the effect of restoring the soil contaminated by the heavy metal cadmium in a short time is achieved while the yield of the ramie is kept to reach a relatively high level.

The invention discloses a method for selecting scheelite at normal temperature. The method comprises the following steps: (1) pulping: a raw ore is milled and classified to prepare pulp with a concentration of 30-35%; the pulp is injected in a flotation machine; and the pH of the pulp is adjusted within 7-9; (2) roughing: a water glass and sodium humate combined inhibiting agent is adopted to inhibit a calcium-contained gangue mineral; and a sodium oleate and benzohydroxamic acid combined capturing agent is added for roughing and scavenging to obtain a scheelite concentrate; (3) the concentration of the scheelite concentrate is condensed to 60%; and the water glass and sodium humate combined inhibiting agent is added for strongly stirring by above 30 m under the effect of a normal-temperature magnetic field to dilute to the mass concentration of 30%; and (4) six times of blank selection are performed for the scheelite concentrate treated in the step (3) to obtain the scheelite concentrate.

The invention discloses a preparation method and application of a magnetic modified sodium alginate flocculating agent. The preparation method comprises the following steps: grafting partially oxidized sodium alginate by using thiosemicarbazide, and performing reaction with Fe3O4 nanoparticles of which the surfaces are modified by amino groups to obtain a magnetic thiosemicarbazide-sodium alginate flocculating agent with a special effect. The method mainly comprises the following three reaction processes of (1) reacting the partially oxidized sodium alginate with the thiosemicarbazide to generate a Schiff base, and reacting the Schiff base with NaBH4 to generate stable amine; (2) preparing the magnetic Fe3O4 nanoparticles by using a co-precipitation method, and performing surface modification on the Fe3O4 nanoparticles by using gamma-aminopropyltriethoxysilane (KH-550); (3) reacting thiosemicarbazide-sodium alginate with the modified Fe3O4 nanoparticles to obtain the magnetic sodium alginate flocculating agent (ST-Fe) at room temperature in the presence of a catalyst EDC / NHS. The obtained product can be applied to sewage treatment and precious metal recovery, has the advantages of efficient adsorption, high sedimentation speed, simplicity in separation, low cost, biodegradability, no secondary pollution and the like, and has wide industrial application prospect.

The invention relates to a carbonate phosphorite reverse flotation collecting agent and a formula of the carbonate phosphorite reverse flotation collecting agent, in particular to the novel carbonate phosphorite reverse flotation collecting agent which is formed by modified fatty acids and surface active agents in a compound mode. Cotton oil residues or modified cotton oil residues, saturated senior fatty acids, modified fatty acids, strong base A and a moderate amount of water are used as dispersion media to be added to a high-pressure reaction still and react for 4 hours to 10 hours under the temperature between 140 DEG C and 180 DEG C, collecting agent primary substances are obtained, water is added to the collecting agent primary substances to prepare a solution with the 2% solid content by weight in the using process, and then the novel carbonate phosphorite reverse flotation collecting agent is obtained. By-products in the vegetable oil processing process is used as raw materials, the cost of the raw materials is low, a collecting agent can be suitable for low-grade and medium-grade collophanite reverse flotation under the normal temperature, and the separation effect of low-grade and medium-grade collophanite which is difficult to separate is good.

The invention relates to a testing reagent for activated partial thromboplastin time. The testing reagent is prepared from phospholipids, activator and stabilizer. The stabilizer is prepared from, by mass, 1%-4% of alanine and 0.5-5 mM of catechin. A preparation method of the testing reagent includes the steps that an HEPES buffer solution is prepared, the pH value of the buffer solution is adjusted to be neutral, and sodium chloride is added; the activator is added to the buffer solution, phospholipids and other components are added after stirring and even mixing are conducted, and then the testing reagent for APTT is obtained after even mixing, stirring and filtering are conducted. According to the testing reagent for activated partial thromboplastin time, stabilizer components with high toxicity are removed, so that production and use processes are safer; meanwhile, the stability and detection accuracy of the testing reagent for APTT are greatly improved.

The invention discloses a method for preparing a phosphine poly-maleic anhydride water scale inhibitor. The method comprises the following steps of: (1) adding maleic anhydride, hypophosphite compound and a catalyst into a reaction vessel which is provided with a thermometer, a stirrer and a reflux condenser, wherein the dosage of the catalyst accounts for 0.004 to 0.02 percent of the total mass of materials; adding water, dissolving the maleic anhydride and the hypophosphite compound in water under a gradually heating condition, starting the stirrer to uniformly mix; (2) adding oxidant and water into a dripping tank, and uniformly mixing, wherein the mass ratio of the maleic anhydride to the hypophosphite compound to the oxidant is 0.5-1.8:0.2-0.6:0.5-1.5; and (3) slowly dripping the oxidant solution in the dripping tank into the reactor, controlling the reaction temperature to be between 60 and 120 DEG C and the reaction time to be between 0.5 and 10h, and cooling and packaging after the reaction is completed.

The invention discloses a carboxymethyl chitosan-cyclodextrin-activated carbon composite material for treating sewage. 6-aminated cyclodextrin is used as a cross-linking agent to crosslink carboxymethyl chitosan into a complex network structure, and activated carbon molecules are uniformly distributed on the network structure to form a composite material with huge molecular structure and strong adsorption capacity; firstly, the molecular structure is huge, the adsorption capacity is high, various pollutants such as proteins, carbohydrates, fat, urea or ammonia nitrogen in sewage can be adsorbed, heavy metal ions in the sewage can also be adsorbed, and the water purification effect is superior to that of a traditional inorganic water purification agent; by adopting the water treatment agentfor treating the sewage, various eutrophic ions and heavy metals in the sewage can be effectively removed at the same time, and the limitation that a conventional water treatment agent can only adsorb and remove single nitrogen-rich or phosphorus-rich nutrient elements is broken through.

The invention discloses a modified attapulgite filter material for heavy metal wastewater treatment and a preparation method of the modified attapulgite filter material. The modified attapulgite filter material is prepared by the following steps of a, adding attapulgite powder and a silane coupling agent in water for ultrasonic dispersion treatment to prepare modified attapulgite; b, mixing the modified attapulgite with tetrasodium iminodisuccinate to obtain a mixture; and c, adding silica sol in the mixture, and performing pelleting to prepare the modified attapulgite filter material for heavy metal wastewater treatment. The method has the beneficial effects that by utilizing etrasodium iminodisuccinate to modify the attapulgite filter material, the prepared filter material is large in specific surface area and strong in adsorption ability, strengthens the chelation to heavy metal ions, greatly increases the adsorption quantity to the heavy metal ions, can be recycled for many times and cannot generate secondary pollution to environment.

The invention discloses an organic special fertilizer capable of enhancing sweetness of citrus fruits and enabling citruses to have high yield, for planting citruses. The organic special fertilizer is prepared from the following raw materials in parts by weight: 30-50 parts of vinegar dregs, 30-50 parts of Maya blue powder, 65-105 parts of livestock manure, 20-40 parts of nostoc sphaeroides yeast powder, 15-20 parts of bamboo pulp dregs, 5-10 parts of EDTA ferric sodium salt, 10-20 parts of sugar alcohol magnesium, 10-15 parts of crop straw powder, 6-10 parts of dried stevia rebaudiana leaves, 3-6 parts of abandoned lime peel, 3-6 parts of durian shells, 10-20 parts of extracted leaf residues of stevia rebaudiana, 10-30 parts of red jujube leaves, 0.1-0.5 part of nanometer activated carbon, 0.4-0.5 part of photosynthetic induction factors, 2-6 parts of bacillus subtilis microbial inoculum, 1-5 parts of corynebacterium glutamicum, 3-5 parts of trichoderma virens, 3-5 parts of phosphate solubilizing bacteria, 1-3 parts of potassium-releasing bacteria and the like. The organic special fertilizer disclosed by the invention has various functions of increasing yield, enhancing sweetness, improving soil, restraining soil-borne diseases and the like.

The invention relates to the technical field of anti-freezing deicing agents, in particular to an efficient corrosion-inhibiting anti-freezing deicing agent. The efficient corrosion-inhibiting anti-freezing deicing agent comprises, by weight, 80-99.5% of sodium chloride, 0.1-15% of corrosion inhibitor and 0.4-5% of assistant. The sodium chloride is refined vacuum salt; the corrosion inhibitor is composed of molasses, sodium gluconate, zinc dihydrogen phosphate, sodium metasilicate nonahydrate and sodium lignin sulfonate; the assistant is composed of sodium carboxymethylcellulose, polyvinylpyrrolidone and urea. By the anti-freezing deicing agent, corrosion to metal and cement concrete can be effectively lowered; the selected molasses in the corrosion inhibitor is a byproduct of the sugar industry, and has strong chelating capability on bivalent cations; the sodium carboxymethylcellulose and the polyvinylpyrrolidone used in the assistant can enhance the strength of granulation salt granules, and collapse of the granule structure during transportation and use are avoided; the production process is simple and easy to implement and performed at normal temperature and under normal pressure, conditions are mild, and granular solid is suitable for large-scale mechanical dispersion.

The invention discloses a magnetic metal-organic framework nanosphere with multiple affinity sites as well as a preparation method and application thereof. The magnetic metal-organic framework nanosphere consists of a Fe3O4 magnetic sphere, a high-molecular polymer intermediate layer coating the surface of the magnetic sphere, a metal-organic framework growing on the high-molecular polymer intermediate layer and arginine grafted on the metal-organic framework. The magnetic metal-organic framework nanosphere disclosed by the invention takes the Fe3O4 magnetic sphere as a kernel and has good magnetic response performance; the metal-organic framework is introduced onto the surface of the magnetic sphere, and the organic ligand surface is modified through the arginine; as metal ions forming the metal-organic framework, a guanidyl on the arginine and the like can be taken as the multiple affinity sites for enriching phosphorylated polypeptides, the enrichment of the phosphorylated polypeptides for single-phosphorylation sites and multi-phosphorylation sites is achieved; the magnetic metal-organic framework nanosphere has high enrichment efficiency and has very important significance in studying the phosphorylation process of physiological behavioral proteins.

The invention relates to a photothermal preparation based on biliverdin, comprising biliverdin, biliverdin gel, biliverdin- Metal chelates, biliverdin-Biomolecular complex, biliverdin-Biomolecule-Metal functional assembly. The photothermal preparation has the following advantages: 1) near-infrared absorption and good tissue penetration depth, The preparation of this series of biliverdin-based photothermal preparations is of great significance for the development of multifunctional phototherapeutic drugs, and has great potential applications in tumor, dermatosis (such as pigment diseases), vascular diseases and so on. 3) Biocompatibility and metabolic mechanism are clear.

The invention discloses agricultural ammonium polyphosphate capable of being chelated with medium trace elements. The agricultural ammonium polyphosphate is characterized by comprising the following components in parts by weight: 10000 parts of agricultural ammonium polyphosphate, 200-2000 parts of a trace element additive, 1-100 parts of a sulfur-containing agent, 1-50 parts of a precipitation inhibitor, 1-50 parts of an emulsifying agent, 1-20 parts of an acid and alkali regulating agent, 1-5 parts of an oxidant and 1-5 parts of an amino acid type nutrient. A water-soluble agricultural ammonium polyphosphate fertilizer is compounded so that ammonium polyphosphate and the additive which are originally incapable of being chelated with metal ions or are low in chelation quantity have the chelating capability; the prepared chelated type ammonium polyphosphate is moderate in acid-base property; the solution is stable and free of precipitates within three months; the suitable application temperature range is from -15 DEG C to 40 DEG C; the agricultural ammonium polyphosphate is convenient to popularize and use nationwide.

The invention discloses a multi-component composite chelating agent for fly ash treatment. The multi-component composite chelating agent comprises the following components in percentage by mass: 10-60% of organic sulfide, 1-30% of inorganic sulfide, 1-20% of inorganic phosphate and 1-30% of an organic low-molecular-weight dispersing agent, with the balance being water. The invention provides the heavy metal composite chelating agent for waste incineration fly ash. The chelating agent is simple in preparation method; the composition of the agent is simple and easy to obtain; the chelating agentis comprehensive in component, is homogeneous and stable, can effectively stabilize almost all heavy metal ions in the fly ash for a long time, and allows the fly ash to reach standards for standardlandfill; the purpose of efficiently stabilizing heavy metal ions can be achieved by adopting a small amount of the chelating agent; and the chelating agent has the advantage of high cost performance.

The invention discloses a preparation method of a composite beef seasoning, which comprises the steps of: (1) treatment of raw materials: cleaning, blanching and soaking fresh cattle bone and beef, removing the dirt on the surface and draining the treated cattle bone and beef, and dicing the cattle bone and beef for later use; (2) performing enzymolysis and fermentation to the cattle bone to obtain a fermentation liquid; (3) preparing beef concentrate; (4) thermal-reaction and granulation: uniformly mixing the fermentation liquid, the beef concentrate and beef ultra-micro powder with addition of cysteine and xylose, and performing a Maillard reaction at 50-60 DEG C for 40-45 min; (5) adding [beta]-cyclodextrin after the reaction finished for flavoring the reaction product and embedding nutrients in the reaction product to enable the ratio of a wall material to a core material to be 1:1-1.5:1; and (6) spray-drying the product to obtain the composite beef seasoning. By means of the method, the content of soluble calcium in the composite beef seasoning is increased and the bioavailability of the soluble calcium is improved. The nutrients in the composite beef seasoning are effectively maintained and the flavor of the seasoning is enhanced.

The invention relates to a composite phosphorus-free crude oil metal chelating agent which is stable in performance, efficient and environmentally friendly. The metal chelating agent is prepared by uniformly compositing 30-40 wt% of a terpolymer, 5-20 wt% of a dicarboxylic acid, 20-30 wt% of a sodium alkyl sulfonate copolymer, 10-20 wt% of an amphiprotic ionic type crude oil demulsifying agent and 10-15 wt% of water at room temperature in a reactor, and performing microwave irradiation. The terpolymer used in the compositing step is prepared by subjecting an alpha-aminocrotonic acid end-capped polyether reactive monomer, 4-hydroxycrotonic acid and vinyl-containing unsaturated carboxylic ester to free radical copolymerization. The general structure formula of the terpolymer is shown in the specification, wherein A is a repeat unit formed after copolymerization of the vinyl-containing unsaturated carboxylic ester, the degree x of polymerization is 2-500, y is 2-500, z is 2-500, and the number m of the repeat units is 3-80. The metal chelating agent has excellent metal chelating performance, and can remove 90% or above of calcium and 45% or above of iron from crude oil.

The invention discloses a special scale inhibitor for an integrated membrane system in a waste water deep treatment process. The special scale inhibitor for the integrated membrane system comprises the components in parts by weight: 15-35 parts of tannic acid, 20-40 parts of polyaspartic acid, 5-20 parts of vinyl methyl ether / maleic anhydride copolymer, 2-10 parts of dodecyl dimethyl benzyl ammonium chloride and 20-31 parts of distilled water. The tannic acid and the polyaspartic acid are used as main agents; the formation of insoluble salts can be inhibited under the coordinated effect of the tannic acid and the polyaspartic acid; meanwhile, the tannic acid and the polyaspartic acid can chelate heavy metal ions in waste water and can be dispersed in the waste water to stop the depositions of the heavy metal ions on the surface of a membrane; the tannic acid and the polyaspartic acid are also compounded with the vinyl methyl ether / maleic anhydride copolymer and the dodecyl dimethyl benzyl ammonium chloride to further enhance the complexing property and chelating property of the scale inhibitor on the basis of inhibiting slime deposition and peeling off slime. As the used raw materials are all non-toxic and hazard free and are easily biodegraded, the special scale inhibitor for the integrated membrane system is an environment friendly water treatment agent.

The invention discloses a preparation method of loess and itaconic acid copolymer adsorbent. The loess and itaconic acid copolymer adsorbent is obtained by conducting in-situ polymerization copolymerization under the effects of organic crosslinker and initiator with loess as a matrix and with itaconic acid, methacrylic acid beta-hydroxy ethyl and N-vinyl pyrrolidone as functional monomers, wherein itaconic acid, methacrylic acid beta-hydroxy ethyl and n-vinyl pyrrolidone are low in price and have biocompatibility. Due to the fact that in the copolymer, some active functional groups are introduced to the surface of loess, the chelation capacity and the ion exchange capacity of loess and metal ions are enhanced, and the loess and itaconic acid copolymer adsorbent has high adsorption capacity for heavy metal ions and cationic dye in waste water. Meanwhile, due to the fact that loess, itaconic acid and the like belong to biocompatible macromolecule monomers, the obtained copolymer has very high biocompatibility and is friendly to the environment; therefore, the loess and itaconic acid copolymer adsorbent is expected to be applied to removal of pollutant in the food industry.

The invention discloses a preparation method and application of amidation modified magnetic chitosan microspheres. The preparation method of the amidation modified magnetic chitosan microspheres specifically comprises the following steps: CoFe2O4 nano-particles are synthesized by adopting a hydrothermal method; magnetic chitosan microspheres are formed under a cross-linking effect of glutaraldehyde through a reversed-phase emulsion polymerization method; and 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) is grafted onto the magnetic chitosan microspheres through an amide reaction, so thatthe amidation modified magnetic chitosan microspheres are obtained. The amidation modified magnetic chitosan microspheres prepared by the preparation method disclosed by the invention have good mechanical properties and sufficient adsorption sites, so that adsorption capacity to U(VI) in wastewater is large, and removal capability is good. The amidation modified magnetic chitosan microspheres adsorbing U(VI) can be quickly separated and analyzed from an adsorbed substrate (wastewater) by a magnetic field, and a new way is provided for U(VI) removal in wastewater.

The invention discloses a bismuth sulfide mineral inhibiting agent and application thereof. The inhibiting agent comprises the following components in parts by mass: 2-5 parts of hydrogen peroxide, 3-4 parts of gallic acid, and 1-2 parts of dextrin. In a flotation process of sulfide minerals containing bismuth, 50-500 g / t combined inhibiting agent is added in each flotation according to each tonnage of raw ore minerals, so that the inhibition of the sulfide minerals containing bismuth can be realized. The bismuth sulfide mineral inhibiting agent has the advantages of high acting effect, low use level and the like, is free of using such high-consumption medicaments as poisonous cyanides, lime and sodium sulfide to reduce environmental pollution, meanwhile, reduces the beneficiation cost, and improves the sorting index.

The invention discloses a water-absorbing profile adjusting sleeve pipe and adjusting method for a water injection well, which comprise the sleeve pipe and different adjusting methods for a water-absorbing profile. According to reservoir physical properties, water-absorbing profile characteristics and oil-water communication conditions of oil reservoir, wells with non-uniformly distributed water-absorbing profiles can be treated in a targeted manner, so that the degree of water drive use, the water drive sweeping area and the oil field recovery ratio can be effectively improved.

The invention discloses a silicon carbide-based composite circuit board and a preparation method thereof and belongs to the technical field of circuit boards. The silicon carbide-based composite circuit board comprises a silicon carbide-based composite base board and a circuit printed on the silicon carbide-based composite base board, wherein the silicon carbide-based composite circuit board is prepared from raw materials of, by weight part, 50-60 parts of silicon carbide, 20-28 parts of glass powder, 5-10 parts of filler, 3-7 parts of adhesives and 7-12 parts of additives. The silicon carbide-based composite circuit board is prepared by taking the silicon carbide and the glass powder as the main component and matching with the filler, the adhesives and the additives through ball milling,ultrasonic treatment, spray granulation and three sintering processes. Through dispersion and adhesion of the raw materials, the prepared silicon carbide-based composite base board can be low in thermal expansion coefficient, high in mechanical strength, good in stability and capable of effectively improving the qualification rate, thereby being high in promotional significance.

To provide an amino group-containing water-soluble copolymer having a high chelating performance and clay dispersancy and a method of producing the amino-group containing water-soluble copolymer efficiently and with high productivity. A water-soluble polymer containing an amino group-containing monomer unit, wherein the water-soluble polymer has a molecular weight distribution of 12 or less, and a method of producing the water-soluble polymer according to any one of claims 1 to 4, wherein the method comprises a step of polymerizing an amino group-containing allyl monomer using an initiator containing a heavy metal ion and sulfurous acid (sulfite), hydrogensulfite or hydrogen peroxide.

The invention relates to the technical field of decontaminating solutions, in particular to a nuclide decontaminating solution as well as a preparation method and application thereof. The nuclide decontaminating solution consists of the following components in percentage by weight: 0.3-6% of pentasodium diethylenetriamine pentaacetate, 0.1-5% of an auxiliary chelating agent, 0.1-2% of a buffer agent, 0.1-2% of an adsorbent, 1-10% of a surfactant, 0.1-1% of a preservative, 0.1-1% of a defoaming agent, 0.1-1% of an acid-base regulator, 0.1-2% of a stabilizer and the balance of water. The methodhas the advantages of being high in decontamination efficiency, wide in application range, high in environmental adaptability and long in storage time.