50 results about "Sodium cyanate" patented technology

The invention provides a gold leaching agent for treating high-carbon gold-bearing minerals and a gold leaching process, and belongs to the technical field of hydrometallurgy. According to the gold leaching agent, guanidinium thiocyanate is used as an agent main body, a hydroximic acid compound is used as a complexing synergist, and soluble inorganic salt of ferric iron is used as a competitive adsorbent. In a leaching system, guanidine thiocyanate can be decomposed to generate guanidine, sodium sulfide, sodium thiocyanate and water. Thiourea anions are converted into cyanamide under the alkaline condition, then cyanamide is slowly released and decomposed into cyanide ions, the cyanide ions are complexed with gold ions, and gold leaching is achieved. Namely, guanidinium thiocyanate has the effect of releasing the cyanide ions step by step, and slow release of the cyanide ions is realized. The gold leaching agent system does not contain cyanide (sodium cyanide, potassium cyanide and the like) and is a clean and environment-friendly agent system, and efficient leaching of gold in high-carbon gold-bearing minerals can be achieved through the synergistic effect of all functional agent components.

The invention relates to a gold leaching agent for a waste circuit board and a method for selectively and preferentially leaching gold. The gold leaching agent comprises carbonized sodium cyanurate, alkaline thiourea, alkaline polymeric iron, alkali, carbonate, an anionic surfactant and water. The mass ratio of the carbonized sodium cyanurate to the alkaline thiourea to the alkaline polymeric iron to the alkali to the carbonate to the anionic surfactant to the water is (0.01-5): (0.01-5): (0.1-1): (0.1-1): (0.1-1): (0.01-5): (50-100); wherein the anionic surfactant is sodium m-nitro-p-toluenesulfonate and / or sodium nitrobenzene sulfonate; by means of the gold leaching agent, gold on the waste circuit board can be effectively leached out, and the leaching rate and the reaction efficiency are both high.

The cyanide-free copper-zinc alloy plating solution comprises 18-24 g / L of polycuprous thiocyanate, 9-13 g / L of polyzinc thiocyanate, 130-170 g / L of polysodium thiocyanate and 8-12 mL / L of brightener, the pH value of the plating solution is 10-12, the temperature of a plating bath is 35-55 DEG C, the cathode current density is 0.5-1.5 A / dm < 2 >, the cathode movement speed is 3-5 m / min, a copper-zinc alloy plate with the copper mass fraction being 68% is used as an anode, and the anode movement speed is 3-5 m / min. The brightening agent is prepared from 60 to 100 parts of N, N '-di-n-propylethylenediamine, 10 to 20 parts of waterborne polyurethane resin, 80 to 120 parts of polyacrylamide of which the molecular weight is less than 8000 and 770 to 870 parts of deionized water. A steel matrix or zinc alloy matrix copper-zinc alloy and bright nickel plated sample piece is subjected to an acetate fog test for 72 h according to GB / T 10125-2021 Artificial Atmosphere Corrosion Test Salt Spray Test, the surface of the steel matrix or zinc alloy matrix copper-zinc alloy and bright nickel plated sample piece is free of rust, and according to GB / T 5270-2005 Metal Covering Layer Electro-Deposition and Chemical Deposition Layer Adhesive Strength Test Method, the coating binding force is tested by a thermal shock method. And the result meets the standard requirement.

The invention discloses a nickel plating process for a neodymium iron boron permanent magnet. A sulfate zinc plating layer, a cyanide-free copper-zinc alloy plating layer, a bright nickel plating layer and a rare earth electrolysis protection film are sequentially prepared on a neodymium iron boron permanent magnet base body from inside to outside. According to the cyanide-free copper-zinc alloy electroplating process, 18-24 g / L of polycuprous thiocyanate, 9-13 g / L of polyzinc thiocyanate, 130-170 g / L of polysodium thiocyanate and 8-12 mL / L of a copper-zinc alloy electroplating brightener are adopted, the pH value of a plating solution is 10-12, the temperature of a plating bath is 35-55 DEG C, the cathode current density is 0.5-1.5 A / dm < 2 >, the cathode movement speed is 3-5 m / min, a brass plate is used as an anode, and the anode movement speed is 3-5 m / min. A prepared sample piece is subjected to a neutral salt spray test for 100 h according to the GB / T 10125-2021 standard, and the surface of the sample piece is not rusted, and a plating layer has excellent corrosion resistance.

The invention relates to the technical field of metal surface treatment, in particular to a method for improving the surface performance of a metal part through salt bath composite nitriding treatment, and particularly relates to a salt bath composite nitriding treatment process for a high-wear-resistance and high-fatigue shaft pin. Comprising the following steps: 1) pretreatment: carrying out sand blasting cleaning on the shaft pin and polishing until Ra is less than or equal to 0.8 mu m; 2) salt bath composite nitriding treatment: immersing the shaft pin into a salt bath containing sodium cyanate, potassium cyanate, sodium carbonate, lithium carbonate and an additive, and keeping the temperature at 560 DEG C for 2-4 hours; and (3) cooling and strengthening treatment: slowly cooling after dynamically cooling to 500 DEG C, and releasing residual stress in combination with oxidation treatment and low-temperature tempering. According to the process, a compact nitriding layer and a micro-boronizing layer are formed through the synergistic effect of rare earth oxide and fluoride, so that the surface hardness of the shaft pin reaches HV800-1100, the depth of the nitriding layer is 0.1-0.3 mm, the wear resistance is remarkably improved, the fatigue life is remarkably prolonged, the corrosion resistance is remarkably improved, and the process is suitable for surface strengthening of high-load mechanical parts.

The utility model discloses a sodium thiocyanate anti-caking stock bin which comprises a bin body with a discharging port formed in the bottom, a feeding port and a mounting hole are formed in the top of the bin body, a dehumidification device is arranged in the mounting hole and comprises a filter screen, a sealing plate, a motor, auger blades and super absorbent resin particles, the sealing plate is in flange connection with the mounting hole, the filter screen is of a cylindrical structure, and the motor is connected with the motor. The top of the filter screen is fixedly connected with the lower surface of the sealing plate, the motor is installed on the sealing plate, the auger blade is located in the filter screen, the outer diameter of the auger blade is smaller than the diameter of the filter screen, the motor drives the auger blade to rotate, and the super absorbent resin particles are located in the filter screen. The moisture absorbent is arranged to adsorb moisture in the bin body, and the problem that sodium thiocyanate absorbs water and hardens is prevented.

The present application provides a copper-sulfur separation combined inhibitor and a flotation method for copper sulfide ore, and relates to the field of mineral flotation inhibitors. The raw materials of the copper-sulfur separation combined inhibitor include: sodium cyanate, sodium cyanurate and sodium carbonate; the mass ratio of the sodium cyanate, the sodium cyanurate and the sodium carbonate is (5-7): (1-3): 1. The copper-sulfur separation combined inhibitor can replace the traditional lime inhibitor, realize the environmental protection and efficient recovery of copper-sulfur resources, and overcome the various disadvantages of using lime as an inhibitor, such as the sticky foam resulting in low copper concentrate grade, calcium corrosion of pipelines and equipment, high pH value of tailings water and environmental pollution.

A process for beneficiating a sulphide ore comprising one or more sulphide minerals into at least one value mineral-rich froth concentrate is provided. The process includes subjecting an aqueous slurry or pulp of particles of the sulphide ore, in the presence of a depressant selected from the group consisting of cyanuric acid trisodium salt (C3H4N3NaO3), sodium cyanate (NaOCN), cyanuric acid (C3H3N3O3), and mixtures of two or more of these, to froth flotation by aerating the slurry or pulp thereby to produce at least one value mineral-rich froth concentrate and an aerated slurry or pulp that includes gangue. Said at least one value mineral-rich froth concentrate is then separated from the aerated slurry or pulp.

The invention provides an anti-permeability and anti-sulfate corrosion additive for organic nano concrete, and belongs to the technical field of concrete. The additive disclosed by the invention contains ethylenediamine methylene sodium phosphate, sodium polyacrylate, sodium thiocyanate, polylactic acid-glycolic acid copolymer (PLGA), hydroxypropyl ethanolamine, a modified nano graphite material, chitosan quaternary ammonium salt, a silane coupling agent, nano volcanic ash powder and other components in a specific proportion. Wherein the modified nano-graphite material is prepared by modifying nano-graphite powder with polyether amine and a silane coupling agent; all the components are matched and the additive is prepared by adopting a special preparation method, and the additive has good impermeability and sulfate corrosion resistance when being used in concrete, and is stable and reliable.

The invention provides a copper-sulfur separation combined inhibitor and a flotation method of copper sulfide ore, and relates to the field of mineral flotation inhibitors. The copper-sulfur separation combined inhibitor comprises the following raw materials: sodium cyanate, sodium cyanurate and sodium carbonate, the mass ratio of the sodium cyanate to the sodium cyanurate to the sodium carbonate is (5-7): (1-3): 1. The copper-sulfur separation combined inhibitor can replace a traditional lime inhibitor, environment-friendly and efficient recovery of copper-sulfur resources is achieved, and the defects that the grade of copper concentrate is not high, pipelines and equipment are subjected to calcium deposition and corrosion, the pH value of tailing water is high, and the environment is polluted due to the fact that foam is sticky when lime is adopted as the inhibitor are overcome.

The invention relates to a flotation separation method for refractory mixed lead-zinc ore. The method comprises the steps of lead preferential flotation, lead-zinc bulk flotation, lead-zinc separation flotation and zinc flotation, and a novel sphalerite combined inhibitor composed of zinc sulfate, sodium cyanurate, thiourea, polyferric chloride and sodium carbonate is added during lead-zinc separation flotation. The method realizes efficient recovery of compact dip-dyed and fine vein dip-dyed symbiotic complex refractory mixed lead-zinc ores, and has wide industrial application and popularization prospects.

The utility model discloses a sodium thiocyanate anti-caking device, and relates to the technical field of sodium thiocyanate. Comprising a stirring barrel, a stirring assembly is arranged in the stirring barrel, the top face of the stirring barrel is fixedly connected and communicated with a feeding pipe, a discharging opening is formed in the center of the bottom face of the stirring barrel, the discharging opening is fixedly connected and communicated with a first conveying auger, and the end, away from the discharging opening, of the first conveying auger is fixedly connected and communicated with a second conveying auger; the end, away from the first conveying auger, of the second conveying auger is fixedly connected and communicated with the top face of the stirring barrel through a second discharging pipe, and the first conveying auger and the second conveying auger are perpendicular to each other. According to the utility model, the first conveying auger, the second conveying auger and the mixing drum form a circulating state, so that sodium thiocyanate circularly flows in the mixing drum, the first conveying auger and the second conveying auger, and the sodium thiocyanate can be in a loose state; and the phenomenon that the sodium thiocyanate is mutually extruded from a loose state to form a block mass due to long-term stacking and stacking extrusion is effectively avoided.

The application discloses a method for preparing 2,6-dimethoxy-4-amino pyrimidine in a microchannel, and the method comprises the following steps: taking 2,4,6-trichloropyrimidine as raw material, and reacting with a sodium methoxide solution in a microreactor to obtain a methanol solution of 2,6-dimethoxy-4-chloropyrimidine; after post-treatment, 2,6-dimethoxy-4-chloropyrimidine is dissolved in toluene to obtain a toluene solution of 2,6-dimethoxy-4-chloropyrimidine; the toluene solution is reacted with a mixed solution of sodium cyanate, methanol, a palladium catalyst, a ligand and toluene to obtain (4,6-dimethoxypyrimidin-2-yl) methyl tert-butylcarbamate; and then, the (4,6-dimethoxypyrimidin-2-yl) methyl tert-butylcarbamate is reacted with hydrochloric acid to obtain 2,6-dimethoxy-4-amino pyrimidine. Compared with a traditional synthesis route, the method has the advantages of simple synthesis, simple operation, high yield, and no need of using highly toxic and high-risk materials, and the synthesis steps are greatly shortened by adopting a continuous synthesis mode of a microreactor.

The utility model discloses a sodium thiocyanate continuous production device which comprises a base, a feeding port is formed in the upper portion of the base, a screen is arranged between the feeding port and a discharging baffle, a fixing seat is arranged on the base, a first pressing frame and a second pressing frame are arranged on the fixing seat, the first pressing frame and the second pressing frame are both connected with the fixing seat in a sliding mode, and the first pressing frame and the second pressing frame are connected with the base in a sliding mode. A fixing block is arranged below the fixing seat, a sliding rod is arranged in the base, a spring is connected to the sliding rod in a sleeving mode, a cam is arranged on the base, two sets of symmetrically-distributed fixing frames are arranged on the base, and cleaning brushes are arranged on the fixing frames. The winding rod, the expansion roller and the like are matched with the first pressing frame and the second pressing frame to achieve timing transmission conversion of the screen, so that it is guaranteed that the screen is in the maximum filtering efficiency state when filtering sodium thiocyanate for a long time, and continuous production and production efficiency of sodium thiocyanate are guaranteed; and a worker does not need to regularly stop the production work of sodium thiocyanate to replace the screen.

The invention relates to the technical field of methyl isocyanate, in particular to a methyl isocyanate preparation method based on a dimethyl sulfate route, which comprises the following steps: raw material preparation: raw materials comprise sodium cyanate, orthodichlorobenzene and dimethyl sulfate, the mass ratio of sodium cyanate to dimethyl sulfate is 1: (0.6), and the mass of orthodichlorobenzene is 3-5 times that of sodium cyanate; the method comprises the following steps: raw material pretreatment: respectively pretreating sodium cyanate, o-dichlorobenzene and dimethyl sulfate for later use; according to the method, uniform slurry is formed through grinding, the specific surface area of sodium cyanate particles is increased, full contact between the sodium cyanate particles and dimethyl sulfate is promoted, the effect of improving the reaction efficiency is achieved, after heating and negative-pressure dehydration treatment, hydrolysis of dimethyl sulfate and hydrolysis side reaction of methyl isocyanate can be prevented through reduction of moisture, and therefore generation of impurities is reduced, and the product quality is improved. The product purity is improved, the product is prevented from being decomposed or subjected to secondary reaction at high temperature due to lower rectification temperature, and the product stability is ensured.

The embodiment of the invention discloses a preparation method of acrylic isocyanate ester, which comprises the following steps: reacting substituted or unsubstituted acrylic acid as shown in a formula I with bromoethanol under the action of acid to obtain an intermediate mixture, and reacting the intermediate mixture with sodium cyanate under the action of a catalyst to prepare the acrylic isocyanate ester as shown in a formula II. According to the embodiment of the invention, the bromoethanol is used as a raw material to react with the substituted or unsubstituted acrylic acid, and then reacts with the sodium cyanate under the action of the catalyst to prepare the isocyanate acrylate with different substituent groups, so that the method is simple in process, low in equipment requirement, environment-friendly in material, low in cost, high in yield and suitable for large-scale industrial production.

The invention discloses an environment-friendly gold extraction agent which comprises the following raw materials: sodium cyanurate, sodium sulfate, sodium citrate and iron carbide. Wherein the mass content of sodium cyanurate is 65%-75%, the mass content of sodium sulfate is 15%-25%, the mass content of sodium citrate is 5%-9%, and the mass content of iron carbide is 1%-5%; the method has the advantages that the leaching rate is high, and meanwhile, the safety and environmental hidden dangers in the transportation, storage or use process can be reduced.

The present invention relates to the field of metal surface treatment technology, in particular to a method for improving the surface performance of metal parts by salt bath composite nitriding treatment, specifically a salt bath composite nitriding treatment process for a high wear-resistant and high fatigue shaft pin. The process includes the following steps: 1) pretreatment: sandblasting and polishing the shaft pin to Ra≤0.8μm; 2) salt bath composite nitriding treatment: immersing the shaft pin in a salt bath containing sodium cyanate, potassium cyanate, sodium carbonate, lithium carbonate and additives, and keeping it at 560°C for 2-4 hours; 3) cooling and strengthening treatment: slowly cooling after dynamic cooling to 500°C, combining oxidation treatment and low-temperature tempering to release residual stress. The process forms a dense nitriding layer and a micro-boronization layer through the synergistic effect of rare earth oxides and fluorides, so that the surface hardness of the shaft pin reaches HV800-1100, and the depth of the nitriding layer is 0.1-0.3mm, which significantly improves wear resistance, fatigue life and corrosion resistance, and is suitable for surface strengthening of high-load mechanical parts.

The invention relates to the technical field of salt extraction and recovery of sodium-process desulfurization waste liquid, in particular to a method and device for extracting product-grade sodium thiocyanate from sodium-process desulfurization waste liquid, and the method comprises the following steps: step a, primary decoloring treatment, step b, primary concentration crystallization, step c, secondary decoloring treatment, step d, freezing crystallization, step e, precise desalting, and step f, secondary concentration crystallization. A stepped process design of two-time decoloration, fractional crystallization and precise desalination is adopted, aiming at the physicochemical property difference of three core salts of sodium sulfate, sodium thiosulfate and sodium thiocyanate in the sodium-process desulfurization waste liquid, efficient separation is realized by accurately controlling process parameters, the sodium sulfate is preferentially separated out by utilizing the characteristic that the solubility of the sodium sulfate is relatively low at high temperature, and the sodium thiosulfate is separated out by utilizing a high-temperature crystallization method. The sodium thiocyanate is separated out in a targeted manner on the premise of ensuring that the sodium thiocyanate is in an unsaturated state, so that the technical problem that the sodium thiocyanate is easy to co-crystallize at low temperature is solved.

This invention relates to the field of oilfield chemical technology, and discloses a low-molecular-weight, high-viscosity ternary polymer flooding agent, its preparation process, and its application. The low-molecular-weight, high-viscosity ternary polymer flooding agent comprises the following raw materials by weight: simulated formation water: 986.2-995.9 g; sodium thiocyanate: 0.2-1.2 g; partially hydrolyzed polyacrylamide: 1.0-3.0 g; dodecyl hydroxypropyl sulfobetaine: 2.0-6.0 g; sodium salicylate: 0.9-3.6 g. The simulated formation water is prepared from deionized water, sodium chloride, calcium chloride, and magnesium chloride. Sodium thiocyanate is added to the simulated formation water to obtain a basic conditioning fluid; partially hydrolyzed polyacrylamide is added to obtain a polymer-based fluid; dodecyl hydroxypropyl sulfobetaine is added to obtain a mixed solution; and sodium salicylate is added to induce a rheological property transformation. This invention constructs a double interpenetrating network structure, solving the problems of insufficient viscosity enhancement and poor plugging.

The invention discloses a magnesium alloy gold plating method with triple electrochemical protection effects and a plating layer structure. The process comprises the following steps: sequentially preparing a chemical zinc deposition layer, a cyanide-free copper-tin alloy plating layer, a cyanide-free copper-zinc alloy plating layer, a bright nickel-copper alloy plating layer, a nickel-phosphorus alloy plating layer, a gold plating layer and an anti-discoloration protective film on a magnesium alloy substrate. According to the cyanide-free copper-tin alloy plating process, 18-24 g / L of polycuprous thiocyanate, 0.2-0.6 g / L of stannous oxalate, 130-170 g / L of polysodium thiocyanate, 20-30 g / L of sodium 1-hydroxyethylidene-1, 1-diphosphonate and 8-12 mL / L of a copper-tin alloy plating brightener are adopted, the pH value of a plating solution is 12-13, the temperature of a plating tank is 30-40 DEG C, the cathode current density is 0.5-1.5 A / dm < 2 >, the cathode movement speed is 3-5 m / min, oxygen-free electrolytic copper particles serve as an anode, the copper particles are loaded into a titanium anode basket, the area ratio of the anode to the cathode is larger than 3: 1, and the anode movement speed is 3-5 m / min. And the surface of a plated part is not rusted after the plated part is subjected to an acetate mist test for 200 hours according to the GB / T 10125-2021 standard.

The present invention relates to a method for efficiently desorbing gold-loaded carbon from gold-containing sulfide ore by carbon leaching, which belongs to the field of gold smelting. The specific steps are as follows: (1) dispersing and desludging the gold-loaded activated carbon obtained in the carbon leaching process, and separating the gold-loaded activated carbon from muddy water by a vibrating screen; (2) transporting the activated carbon obtained in the above step (1) to a circulating conversion column, treating it with a conversion agent, and obtaining calcium carbonate-containing gold-loaded activated carbon, wherein the conversion agent is a mixed solution of sodium carbonate and sodium hydroxide; (3) transporting the gold-loaded activated carbon obtained in the above step (2) to a circulating desorption column, transporting the obtained gold-containing precious liquid to an electrolysis system, and transporting the lean activated carbon to acid washing and decalcification, wherein the desorbent is a mixed solution of sodium carbonate, sodium hydroxide and sodium cyanide. The present invention avoids the normal operation of the gold-loaded activated carbon circulating desorption system by calcium sulfate or calcium hydroxide; at the same time, the difficult-to-desorb calcium auric cyanate is also converted into easily desorbable sodium auric cyanate, thereby improving the gold desorption rate of the gold-loaded activated carbon.

The invention relates to a continuous synthesis process of 1-(2-chlorphenyl)-3-(1-methyl-1-phenylethyl) urea, and relates to the technical field of organic synthesis.The continuous synthesis process comprises the following steps that o-chlorobenzyl chloride serves as an initial raw material, a continuous reaction device I is filled with sodium cyanate, o-chlorobenzyl chloride is added for a reaction, and reaction liquid is obtained; and introducing the reaction liquid into a continuous reaction device II to react with alpha, alpha-dimethyl benzylamine, and transferring into a continuous reaction device III to perform curing reaction, thereby obtaining the 1-(2-chlorphenyl)-3-(1-methyl-1-phenylethyl) urea. The o-chlorobenzyl chloride serving as an initial raw material is changed into o-chlorobenzylamine without an amino substitution reaction and directly reacts with sodium cyanate to obtain o-chlorobenzyl isocyanate, so that the use of highly toxic phosgene in a traditional process is avoided, the synthesis steps are few, a multi-stage tubular filler reactor is adopted, efficient continuous production is realized, and the product has high yield and purity.

The present application relates to a kind of environmental protection type gold dipping agent and gold dipping method, belong to gold dipping technical field;The environmental protection type gold dipping agent includes sodium cyanate and guanidine salt.The gold dipping agent provided by the present application has good gold dipping effect, high gold selectivity, and does not contain traditional toxic sodium cyanide, has little environmental pollution, and is green and environmentally friendly.

This invention belongs to the field of gold extraction agent technology, specifically relating to a method for preparing a gold extraction agent. The invention provides a method for preparing a gold extraction agent, comprising the following steps: mixing sodium cyanate and iron powder, and carrying out a melt catalytic reaction to obtain the gold extraction agent. This invention uses iron powder as a catalyst, which can effectively promote the polymerization reaction of sodium cyanate. During the catalytic polymerization process, iron atoms can break the carbon-nitrogen triple bond in sodium cyanate into a carbon-nitrogen double bond, with one end of the carbon-nitrogen double bond linked to a sodium atom. The obtained gold extraction agent does not contain free cyanide ions and is therefore non-toxic. In application, the sodium in the obtained gold extraction agent can displace gold in gold ore, thus playing a role in gold refining. Test results from the embodiments show that the gold extraction efficiency of the gold extraction agent provided by this invention is comparable to that of sodium cyanide, and it is safe, environmentally friendly, and non-toxic.

The invention discloses a magnesium alloy nickel plating process with triple electrochemical protection effects and a plating layer structure. The process comprises the step of sequentially preparing a chemical zinc deposition layer, a cyanide-free copper plating layer, a cyanide-free copper-tin alloy plating layer, a cyanide-free copper-zinc alloy plating layer, a bright nickel plating layer and an anti-discoloration protective film on a magnesium alloy matrix. According to the cyanide-free copper-tin alloy plating process, 18-24 g / L of polycuprous thiocyanate, 0.2-0.6 g / L of stannous oxalate, 130-170 g / L of polysodium thiocyanate, 20-30 g / L of disodium 1-hydroxyethylidene-1, 1-diphosphonate and 8-12 mL / L of a copper-tin alloy plating brightener are adopted, the pH value of a plating solution is 12-13, the temperature of a plating tank is 30-40 DEG C, the cathode current density is 0.5-1.5 A / dm < 2 >, the cathode movement speed is 3-5 m / min, oxygen-free electrolytic copper particles serve as an anode, the copper particles are loaded into a titanium anode basket, the area ratio of the anode to the cathode is larger than 3: 1, and the anode movement speed is 3-5 m / min. And the surface of a plated part is not rusted after the plated part is subjected to an acetate mist test for 96 hours according to the GB / T 10125-2021 standard.

The invention belongs to the technical field of cement additives, and discloses a high-dosage industrial waste residue cement mineralization activity activator, which comprises a grinding aid and a mineralization enhancer, the grinding aid comprises bio-based alcohol amine, molasses, alpha-olefin sodium sulfonate and water; the mineralization enhancer comprises sodium thiosulfate, sodium thiocyanate, sodium formate and calcium sulfite type desulfurized gypsum. The cement mineralization activity exciting agent is applied to a cement grinding section, a grinding aid and a mineralization enhancer are synchronously doped, and the grinding aid and the mineralization enhancer form a synergistic superimposed effect, so that the technical problem of low 3d strength of cement is solved, and the strength of each age is stably improved by exciting the early hydration activity of the cement and a mixed material.

A method for synthesizing a stable isotope-labeled toltrazuril-D3 belongs to the field of organic synthesis technology. This method uses methylamine hydrochloride-D3 as the stable isotope labeling source, reacting it with p-trifluoromethylthiophenol and 1-chloro-2-methyl-5-nitrobenzene as starting materials, undergoing sequential condensation and reduction to obtain an aminodiphenyl ether intermediate. Simultaneously, methylamine hydrochloride-D3 reacts with sodium cyanate to generate methylurea-D3, which then reacts with carbonyl diimidazole to obtain an activated intermediate. Finally, the aminodiphenyl ether intermediate condenses with the activated intermediate, followed by base-catalyzed cyclization to obtain the target product, toltrazuril-D3. This invention features a rationally designed synthetic route, readily available raw materials, mild reaction conditions, simple operation, and easy product separation and purification. The obtained product achieves a chemical purity and isotope abundance of over 99%.

The invention discloses a cleaning agent for online descaling. The cleaning agent is prepared from the following raw materials in parts by weight: 10 to 15 parts of modified microcline, 6 to 10 parts of octanol polyoxyethylene ether, 4 to 7 parts of sodium thiocyanate, 3 to 6 parts of sodium humate, 8 to 12 parts of modified tourmaline, 8 to 12 parts of deionized water and 2 to 4 parts of silane coupling agent KH560. According to the cleaning agent for online descaling, the octanol polyoxyethylene ether, the sodium thiocyanate and the sodium humate are matched with the modified microplagioclase and the modified tourmaline, balance improvement of the cleaning efficiency and the boiler corrosion protection performance of the obtained cleaning agent is achieved through blending and synergistic effects of the raw materials, and meanwhile the cleaning agent is remarkable in corrosion resistance and heat-resistant stability effect.