264 results about "Sodium carbamate" patented technology

The invention discloses a copper sulfide ore flotation collector as well as a preparation method and application thereof. The collector is alkoxy carbonyl alkyl dithiocarbamate and has a structural formula as shown in the specification, wherein R1 is carbon chain 1-4 alkyl and R2 is carbon chain 2-4 alkyl. The preparation method comprises the following steps: performing nucleophilic substitution reaction on alkylamine, sodium hydroxide and carbon bisulfide to obtain sodium dithiocarbamate; reacting the sodium dithiocarbamate and alkyl chloroformate to obtain a target collector alkoxy carbonyl alkyl dithiocarbamate. The application refers to application of the copper sulfide ore flotation collector in performing flotation on copper sulfide ore and recycling valuable metal minerals in the copper sulfide ore. The collector is capable of realizing effective separation of the copper sulfide ore and pyrite under an ore pulp environment with the pH value of 6-10, reducing the lime consumption, and further effectively recycling useful metals such as gold, silver and molybdenum. Compared with the existing collector, the collector has the advantages of good selectivity and high useful metal recovery rate.

The invention discloses a Cu3BiS3 ternary sulfur nano material and a preparation method thereof, belonging to the field of inorganic nano materials. The Cu3BiS3 ternary sulfur nano material is nano particles which are prepared by adopting a high-temperature pyrolysis method by taking oleic acid, oleylamine and octadecene as reaction solvents, Cu(NO3)2.3H2O and Bi(NO3)3.5H2O as raw materials and sodium diethyldithiocarbamate as a complexing agent and a sulfur source. The Cu3BiS3 nano particles have better absorbability in an ultraviolet/visible light area, and are proved to have a good photo-thermal effect; besides, the Cu3BiS3 ternary sulfur nano particles can be used for performing CT (computed tomography) imaging, so that the nano particles can be well applied in the field of biomedicine. Moreover, the preparation method of the Cu3BiS3 ternary sulfur nano material has many advantages of simple operation, low raw material cost, availability and the like, and is suitable for industrial production and application.

A pasted positive nickel hydroxide electrode for use in battery cells (e.g., in nickel zinc cells, and nickel metal hydride cells) includes nickel hydroxide particles, a cobalt metal and/or cobalt compound and a sulfur-containing complexing agent capable of forming a complex with cobalt. The presence of the sulfur-containing complexing agent, such as dialkyldithiocarbamate (e.g., sodium diethyldithiocarbamate) improves lifetime and capacity utilization of the nickel electrode. The resulting pasted nickel hydroxide electrode includes a CoOOH conductive matrix after formation. The surface of the nickel hydroxide particles in the electrode is modified in some embodiments by providing a cobalt-containing coating onto the surface of the nickel hydroxide particles, followed by oxidation with a strong oxidizing agent. The complexing agent can be added before, after, or during the oxidation.

The invention discloses SiO2/MoS2 core-shell-structure microspheres and a preparation method thereof. The method comprises the following steps: dissolving tetraethoxyl silicion and triethanolamine (or diethanolamine or ethylenediamine or 2-amino-2-methyl-1-propanol) in anhydrous ethanol, dropwisely adding distilled water, and carrying out hydrolysis reaction under certain conditions to prepare SiO2 microspheres; and dispersing the obtained SiO2 microspheres in a water solution containing ammonium molybdate, polyvinylpyrrolidone (K30) and sodium diethyldithiocarbamate, and carrying out hydrothermal reaction in a high-pressure autoclave to obtain the SiO2/MoS2 core-shell microspheres. The SiO2 microspheres prepared by the method have uniform size; and the composite SiO2/MoS2 core-shell microspheres have the advantages of uniform shape and size and favorable dispersity, and can be used for a lubricating oil additive to improve the lubricating conditions.

A method for integrated treatment of electroplating wastewater includes steps of: adjusting and maintaining pH of wastewater at 10.5-12; oxidizing pollutants such as sodium cyanide and hydroxyl-containing organic amine complexants with sodium hypochlorite; precipitating carboxyl-containing organic acid complexants with synergistic effect of ferrous and calcium ions; reducing hexavalent chromium to trivalent chromium and forming chromium hydroxide precipitate; removing precipitate by filtering; adjusting wastewater to pH of 4.5-5.5; precipitating heavy metal ions with sodium dimethyldithiocarbamate or sodium diethyldithiocarbamate; adsorbing precipitate and heavy metal capturing agents with activated carbon; filtering to remove precipitate; adjusting wastewater to pH of 6-8; and destroying aliphatic polyamine complexants and reducing COD using an available biological degradation technique. This method can effectively and economically remove the pollutants such as heavy metals in the electroplating wastewater for a good market prospective.

The invention relates to a preparation method of a soil heavy-metal stabilizer, and belongs to the technical field of soil remediation and treatment. The preparation method comprises the following steps of a, preparing active charcoal, namely, drying organic matter, crushing, immersing by an alkali salt solution, and then firing under the protection of N2 so as to obtain the active charcoal; and b, preparing active organic composite charcoal, namely, mixing a sodium dithiocarbamate derivative solution with the active charcoal, carrying out balance vibration under a dark condition, then centrifuging, collecting a precipitate mixture, and drying so as to obtain the soil heavy-metal stabilizer. The preparation method of the soil heavy-metal stabilizer has the advantages that adsorption and fixing effects for heavy metal in soil are obvious; the absorption of heavy metal in soil cy plants or crops can be relieved effectively; the hazard of taking in heavy metal from crops by human beings is reduced.

The invention discloses a method for producing thiuram disulfide as thiofide by a continuous micro-reaction system. According to the method, three processes including secondary amine-NaOH solution mixing, CS2-secondary amine condensation reaction and sodium dithiocarbamate oxidation reaction are sequentially completed by a micro-mixer and a micro-reactor which are connected in series; reaction materials are efficiently mixed by the micro-reaction device, and side reactions such as overoxidation and the like are avoided; by means of a series-integrated operation mode, production efficiency is improved, and product stability is improved. The method can be applied to production of multiple thiuram vulcanizing agents such as tetramethyl thiuram disulfide, tetraethylthiuram disulfide, tetrabutylthiuram disulfide and the like, the yield can reach 98% or higher, and product purity is high.

The invention discloses a masking-agent-containing test strip for detecting the content of cadmium in a Chinese herbal medicine. The test strip comprises a loading substrate, a glass fiber layer, a reaction substrate and a supporting substrate which are sequentially overlapped on one another, wherein the loading substrate is provided with a test hole and a contrast hole, the glass fiber layer contains a masking agent, the reaction substrate contains a cadmium color developing agent, and the supporting substrate is provided with two observation holes, and the two observation holes respectively correspond to the test hole and the contrast hole; the masking agent is the combination of two or more than two formulae in the following five formulae: a formula I including hydroxylamine hydrochloride and glycine; a formula II including sodium thiosulfate and sodium citrate; a formula III including thiourea and sodium pyrophosphate; a formula IV including sodium potassium tartrate tetrahydrate and thiourea; and a formula V including diethyl dithiocarbamate and phenanthroline. The test strip disclosed by the invention is convenient to carry, is simple to operate, low in cost, high in detection sensitivity and specificity and wide in application range and can realize the rapid spot detection on the heavy metal cadmium in the Chinese herbal medicine.

The invention relates to a soil heavy metal stabilizer and belongs to the technical field of soil remediation treatment. The soil heavy metal stabilizer is mainly prepared from the following components in parts by weight: activated biochar and a sodium dithiocarbamate derivative solution. The soil heavy metal stabilizer has the advantages that a remarkable adsorption and fixation effect on heavy metals in the soil is achieved, plants or crops can be effectively prevented from absorbing the heavy metals in the soil and the risk that human takes in heavy metals from the crops is reduced.

The invention provides a cobalt sulfide material, a preparation method and application of the cobalt sulfide material. The cobalt sulfide material is prepared by the following steps: (1) mixing dimethyl aminodithioformic acid with cobalt chloride hexahydrate according to a mole ratio of 2 to 1 in water for reaction, thus obtaining a first product; (2) under the protection of inert gas, carrying out reaction on the dried first product at 500 to 900 DEG C for 2 to 3 hours, thus obtaining the cobalt sulfide material. The cobalt sulfide material provided by the invention can be applied to the field of hydrogen production from water through electro-catalysis.

The invention discloses a new technology for preparing manganese sulfate solution which is used for electrolyzing manganese metal and recycling iron through the atmospheric pressure leaching of pyrolusite and iron scraps. The technology comprises the following steps: adding pyrolusite in a certain concentration of sulphuric acid solution, mixing evenly; adding iron scraps used as the reductant in a reaction tank, performing mechanical agitation for 1h-3h under different reaction temperatures to obtain reaction leachate; according to the changes of the reaction time and the pH value, adding heavy calcium carbonate and ammonia water in turn to adjust the pH value of the solution to 6.3-6.7; then adding sodium N,N-dimethyl dithiocarbaminate (SDD) to remove impurities such as heavy metal ions and purify; filtering, adding additive to obtain manganese sulfate solution used for electrolyzing manganese; and recycling iron from filter residue through alkali leaching and acid leaching to produce polyferric sulfate. The invention has the advantage that iron scraps are used as the reductant which have wide sources and rich raw materials and can be leached out under the atmospheric pressure; and iron scraps can be recycled to produce the water purification agent and have great economic benefit.

The invention discloses a broad-spectrum heavy metal trapping agent of which the main active ingredient is sodium piperazinyl dithiocarbamate; the invention also discloses a preparation method of the broad-spectrum heavy metal trapping agent. The preparation method comprises the following steps of: reacting anhydro-piperazine, sodium hydroxide and carbon disulfide according to proportion, and keeping constant temperature for 2-2.5 hours to get the light yellow liquid heavy metal trapping agent. The preparation method is simple and safe, the heavy metal trapping agent prepared by the method has better trapping effects on both common free-state and complex-state metals without adding any flocculating agent and regulating the pH value of the waste water. The heavy metal trapping agent belongs to broad-spectrum heavy metal trapping agents, and in comparison with other similar medicines, the broad-spectrum heavy metal trapping agent has the advantages of mild condition, simple production technology, low production cost, strong complexing capability and the like.

The invention discloses a method for treating an alkaline zinc-nickel alloy electroplating waste water. The method comprises the following steps: adjusting the pH of the alkaline zinc-nickel alloy electroplating waste water to be 3-4, adding an aqueous solution of sodium diethyldithiocarbamate for precipitating zinc and nickel, and adding a flocculating agent to make precipitation particles aggregated; adjusting the pH of the electroplating waste water to be 4.5-5.5, and adding a sodium hypochlorite solution; and adjusting the pH of the treated electroplating waste water to be 6-9 to obtain required matter. The treatment method for the alkaline zinc-nickel alloy electroplating waste water provided by the invention can completely precipitate zinc and nickel ions with the sodium diethyldithiocarbamate through controlling the pH of the waste water in a sedimentation tank to be 4.5-5.5; and hydrogen peroxide does not need to be added to destroy aliphatic polyamine strong complexing agentsin the waste water, so that the treatment process is simplified, and the treatment process can interface with current electroplating waste water treatment equipment, solves the difficulty in the treatment of the alkaline zinc-nickel alloy electroplating waste water, and has better market application prospects.

A composite heavy metal chelating agent for waste incineration fly ash and a preparation method thereof are disclosed. The composite heavy metal chelating agent includes, by weight, 15-20 parts of anorganic chelating agent, 5-10 parts of an inorganic chelating agent, 2-10 parts of an inhibitor, 2-5 parts of a dispersant and 50-80 parts of water. The organic chelating agent is a mixture of sodiumbutyl dithioxanthate and sodium dimethyldithiocarbamate. The inorganic chelating agent is sodium hexametaphosphate. The inhibitor is sodium lignosulphonate, and the dispersant is sodium silicate. Thecomposite heavy metal chelating agent is a multi-formula composite heavy metal chelating agent, has strong chelation performance for heavy metals in waste incineration fly ash through synergistic effects of organic and inorganic components, can efficiently achieve stabilization treatment of the waste incineration fly ash and can ensure that pollutant concentrations of leach liquor meet standards.The preparation method of the composite heavy metal chelating agent is also provided.

The invention discloses a viscosity stabilizer for an oil-displacing polymer solution and a preparation method of the viscosity stabilizer. The stabilizer composition includes a solvent and additives;the additives are at least two selected from the group consisting of an antioxidant, an anti-salt agent and a bactericide; the antioxidant is at least one selected from the group consisting of thioethanol, thiourea, thiodipropionic acid, sodium thiosulfate, potassium iodide, 2-hydroxyethylamine and acetone; the anti-salt agent is at least one selected from the group consisting of ethylenediaminetetraacetic acid or a salt thereof, 1-hydroxyethylidene-1,1-diphosphonic acid or a salt thereof, polyacrylic acid and sodium citrate; and the bactericide is at least one selected from the group consisting of N,N-dimethyldithiocarbamic acid sodium salt, methylene dithiocyanate, 2,2-dibromo-3-cyanoacetamide, 2-nitro-2-bromo-1,3-propanediol, glutaraldehyde and isothiazolinone. The stabilizer solves the problem of large viscosity loss of the polymer solution during polymer displacement.

The invention provides a preparation method of a multifunctional probe for tumor thermotherapy as a magnetic resonance imaging contrast agent. The preparation method of the multifunctional probe comprises the following steps: dropwise adding the solution of sodium diethyldithiocarbamate of water into the solution of a copper compound in water, stirring to obtain a blackish brown precipitate which is diethyl dithio amino copper, and drying the precipitate in vacuum; adding a diethyl dithio amino copper containing solution of oleylamine into hot oleylamine, introducing nitrogen into the mixture, heating the mixture, stirring, cooling to room temperature, washing, centrifuging, dispersing into a stabilizer, and evaporating in a rotating way; adding a surfactant, stirring, and filtering to obtain a transparent blackish green solution; adding ethanol into the blackish green solution, oscillating ultrasonically, stirring, adding an alkali, a silicon source and a magnetic compound, and stirring to form nanoparticles in core-shell structures. The probe heats tissues by adopting the heat effect generated in the tissues of a human body by a variety of physical energy such as microwaves, radio frequency and ultrasonic waves to accelerate the death of tumour cells, and the probe can be used as the magnetic resonance imaging contrast agent.

The invention discloses a method for treating alkaline zinc-nickel alloy electroplating wastewater. The method includes destructing strong fatty amine complex agents in the alkaline zinc-nickel alloy electroplating wastewater by the aid of hydrogen peroxide under the condition of pH (potential of hydrogen) of 8-13; enabling dimethyl carbamodithioic acid and heavy metal ions of zinc, nickel and the like to react with one another to generate precipitates of zinc dimethyldithiocarbamate, nickel dimethyldithiocarbamate and the like, and enabling residual heavy metal ions of zinc, nickels and the like in the wastewater to meet requirements of a table 2 in GB 21900-2008 Electroplating Pollutant Discharge Standards. Slow oxidation reaction needs to be carried out for longer than 10h. The method has the advantage that discharge standards can be met by the wastewater after the precipitates are separated from the wastewater.

The invention relates to a method for detecting trace N, N-dimethyldithiocarbamate in water. The method comprises the following steps: derivatively reacting a water sample containing N, N-dimethyldithiocarbamate with a derivatization reagent at pH value of 7.0-10.0 for 10-40 min, so as to obtain flavescent derivative tetramethyl thiuram disulfide; next, detecting tetramethyl thiuram disulfide by using an efficient liquid chromatography, so as to obtain a chromatogram; inputting a chromatographic peak appearing time into an Agilent 1200 LC chemical workstation and processing the chromatographic peak appearing time in the chemical workstation so as to obtain peak height and peak area; and finally, first finding out the peak area on a longitudinal coordinate in a standard curve graph and then finding out data on a horizontal ordinate, which represents the concentration of N, N-dimethyldithiocarbamate in the water, on a curve corresponding to the longitudinal coordinate representing the peak area. The method for detecting trace N, N-dimethyldithiocarbamate in the water, provided by the invention, has the advantages of mild and rapid derivative reaction, no interference peak, rapidness, simplicity, convenience, high accuracy and good repetitiveness; and trace N, N-dimethyldithiocarbamate in municipal sewage can be effectively detected.

The invention provides a vanadium-modified Ni3S2 nano-rod array electrode material which has a scale-shaped surface appearance formed by self-assembling particles. A preparation method comprises the following steps: immersing metal nickel in a suspension solution containing a vanadium source, a sulfur source and ammonium fluoride, and carrying out solvothermal reaction; then, calcining a product of the solvothermal reaction to obtain the nano-rod-shaped vanadium-modified Ni3S2 electrode material. The vanadium source is vanadiumoxy acetylacetonate, sodium metavanadate, sodium vanadate, sodium vanadate dodecahydrate, ammonium metavanadate or vanadium pentoxide; the sulfur source is thiourea, thioacetamide, sodium sulfide, sodium oiethyl dithiocarbamate or a sulfur elementary substance. A nano-rod structure formed by self-assembling the particles has a secondary-grade unit so that catalytic active sites of the material are effectively increased; compared with a block-shaped catalyst, theresistance of the material is effectively reduced and the material can be used as an excellent electro-catalytic oxygen production electrocatalyst.

The invention discloses a method for determining the content of cadmium in soil by ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry). The method adopts an extraction-reextraction system to deal with a soil sample digested by mixed acid and solves the problem of shifting of the cadmium spectral absorption peak, caused by concentration of cadmium in low-cadmium soil digestion solution and soil matrix. The method comprises the steps of enabling cadmium ions in the digestion solution and sodium diethyldithiocarbamatre to form a chelate in mediums with certain pH value, then performing extraction separation by CCl4 organic phase, adding with nitric acid-hydrogen peroxide mixed solution to oxidize and destroy the chelate, performing reextraction to cadmium in water phase and determining the content of cadmium; experimental results show that the method is simple and feasible, has high precision and good accuracy, can determine low cadmium content of the soil, can make up the blank that the ICP-AES cannot accurately determine the cadmium content in the soil and provides new reference for detection analysis of the cadmium content of the soil.

The invention discloses a preparation method for modified sepiolite and an application of the sepiolite in environmental restoration. The preparation method for the modified sepiolite comprises the following steps of (1) enabling natural sepiolite and deionized water to be mixed at a mass ratio of 1 to (10-50), stirring to form a sepiolite turbid liquid, and standing for 6-24h; (2) adding sodium diethyldithiocarbamate into the solution obtained in the step (1) and stirring, wherein the mass ratio of sodium diethyldithiocarbamate to sepiolite is (0.05-0.3) to 1; and (3) performing solid-liquid separation on the stirred solution, washing the solid body by deionized water, and drying and grinding to obtain the modified sepiolite.