33results about How to "Strong chelating ability" patented technology

The invention discloses a high-stability iron-cerium flow battery and a preparation method of electrolyte, and belongs to the technical field of flow batteries. A positive electrolyte and a negative electrolyte are cerium salt and ferric salt, and are respectively mixed with nitrilotriacetic acid, ethylenediamine tetraacetic acid, trans-1, 2-cyclohexanediamine tetraacetic acid, 1, 3-propane diamine tetraacetic acid, N-(2-ethoxyl) ethylenediamine-N, N ', N'-triacetic acid, iminodiacetic acid, iminodisuccinic acid, succinic acid, N, N '-bis (2-hydroxyethyl)-N, N', N '-triacetic acid and N, N'-bis (2-hydroxyethyl)-N, N '-bis (2-hydroxyethyl)-N, N'-bis (2-hydroxyethyl)- N, N '-ethylenediamine disuccinic acid, aspartic acid or a derivative chemical thereof are coordinated to form an aqueous solution of the coordination compound. The positive electrolyte and the negative electrolyte are prepared from the same and equal chelating agent and supporting electrolyte, and the matching degree of the acid-base property of the positive electrolyte and the negative electrolyte is maintained; the auxiliary electrolyte is added, so that the viscosity difference between the positive electrolyte and the negative electrolyte is reduced, the transmembrane migration of water is reduced, and the conductivity is improved. The selected chelating agent is stably combined with iron and cerium, transmembrane transportation of active substances is inhibited, ion cross contamination among different electrolytes is reduced, and meanwhile side reactions are reduced. The price is low, and the charge-discharge performance and the cycle life of the iron-cerium flow battery are effectively improved at relatively low cost.

The invention relates to the technical field of coatings, and discloses a preparation method of a water-based acrylic acid anticorrosive coating, which comprises the following steps: taking PEPA and phosphorus pentoxide as raw materials to obtain double-PEPA-based phosphate; the preparation method comprises the following steps: by taking 3-hydroxyglutaric acid, aminopropyltriethoxysilane, hexamethylene diisocyanate, graphene oxide and the like as raw materials, preparing disilane modified graphene oxide; adding the disilane modified graphene oxide, the double PEPA-based phosphate and the like into the water-based acrylic emulsion, uniformly stirring and mixing, grinding and filtering to obtain the water-based acrylic anticorrosive coating. Phosphorus hydroxyl, silicon hydroxyl and graphene in the coating are used for synergistically assisting in improving the adhesive force and corrosion resistance of the coating, and flame retardant elements are used for improving the flame retardant property of the coating. The water-based acrylic acid anticorrosive paint prepared by the invention has excellent corrosion resistance, flame retardance and adhesive force.

The invention discloses weather-resistant water-based two-component epoxy paint and a preparation method thereof, and belongs to the technical field of paint. The weather-resistant water-based two-component epoxy paint comprises a component A and a component B, the component A comprises 50-70 parts by mass of a modified waterborne epoxy emulsion, 3-6 parts by mass of a pigment, 7-13 parts by mass of a modified filler, 0.3-1.5 parts by mass of a wetting dispersant, 2-4 parts by mass of a coalescing agent, 0.1-0.5 part by mass of a defoaming agent, 0.5-5 parts by mass of water and 0.5-1 part by mass of a leveling agent; the component B comprises 35-65 parts by mass of a modified curing agent, 10-20 parts by mass of ethanol and 30-40 parts by mass of water; the component A and the component B are mixed according to the mass ratio of 100: (20-30); the modified curing agent is obtained by reacting polyethylene glycol diglycidyl ether, epoxy resin, triethylene tetramine, functional organic silicon and phenyl glycidyl ether; the modified filler is obtained by modifying nano silicon dioxide with poly (m-xylylenediamine) and a silane coupling agent KH560; the modified water-based epoxy emulsion is a phytic acid modified water-based epoxy emulsion.

The invention discloses concrete with high salt corrosion resistance and a preparation method of the concrete. The concrete is prepared from 300-400 kg / m < 3 > of cement, 50-150 kg / m < 3 > of slag powder, 1000-1200 kg / m < 3 > of gravel, 650-800 kg / m < 3 > of machine-made sand, 0.5-2 kg / m < 3 > of a modified polycarboxylic acid water reducing agent, 0.005-0.01 kg / m < 3 > of an air entraining agent, 0.05-0.1 kg / m < 3 > of an ion chelating agent, 0.05-0.1 kg / m < 3 > of polyacrylamide, 0.01-0.05 kg / m < 3 > of sodium methyl silicate, 0.1-0.5 kg / m < 3 > of multiwalled carbon nanotube dispersion liquid and 140-160 kg / m < 3 > of water. The preparation method comprises the following steps: stirring and mixing the modified polycarboxylate superplasticizer, the air entraining agent, the ion chelating agent, the polyacrylamide, the sodium methyl silicate and part of the water for mixing to obtain an admixture mixed solution; sequentially putting broken stones, cement, machine-made sand, the admixture mixed solution, the multi-walled carbon nanotube dispersion liquid and the rest of mixing water into a stirrer, and stirring for 2-3 minutes, so as to obtain the concrete with high salt corrosion resistance. The concrete has high salt corrosion resistance in a complex service environment, the service life of a concrete structure is effectively prolonged, and a reliable guarantee is provided for infrastructure construction.

The invention relates to a quick-dry cooling textile integrating flame retardance, antibiosis, radiation cooling and evaporative cooling as well as preparation and application of the quick-dry cooling textile, and belongs to the technical field of functional finishing of textiles. The preparation process is simple, the cost is low, and the prepared textile has good flame retardance, antibiosis, one-way moisture conduction and cooling performance and can be applied to the fields of personal heat management, fire protection, building cooling, antibiosis and the like.

The invention relates to the technical field of aluminum alloys, in particular to a high-strength corrosion-resistant aluminum material and a preparation method thereof. The preparation method comprises the following steps: mixing a chitosan corrosion inhibitor, an amino acid corrosion inhibitor, polysulfone, lignosulfonate and other raw materials to obtain a microcapsule corrosion inhibitor; and adding the microcapsule corrosion inhibitor into a dopamine solution, and carrying out stirring reaction to obtain the dopamine microcapsule corrosion inhibitor. Adding the dopamine microcapsule corrosion inhibitor and the curing agent into epoxy resin to obtain an epoxy resin coating; and the surface of the pretreated aluminum profile is coated with epoxy resin paint, and a finished product is obtained. The finished product prepared through the method has good corrosion resistance, durability and crack resistance, and therefore the finished product has wide application prospects in the technical field of aluminum alloy.

The invention provides a kitchen oil stain cleaning agent and a range hood cleaning method, and relates to the technical field of kitchen cleaning. The kitchen oil stain cleaning agent is prepared from the following raw materials in parts by weight: 30 to 50 parts of sodium silicate, 1 to 10 parts of sodium gluconate, 1 to 10 parts of alpha-sodium olefin sulfonate, 1 to 10 parts of diamine tetraacetic acid disodium salt, 1 to 10 parts of sodium carbonate and 1 to 10 parts of sodium hydroxide. The kitchen oil stain cleaning agent has the advantage of being good in kitchen oil stain cleaning effect. The range hood cleaning method can be matched with a kitchen oil stain cleaning agent to achieve a sufficient cleaning effect on the range hood.

The invention relates to the field of electro-catalysis new materials, and provides a biomass-based carbon-supported iron phosphide nano-catalyst and a preparation method and application thereof.According to the technical scheme, waste pomelo peel biomass is fully utilized, the stability and conductivity of a metal phosphide catalyst are improved, phytic acid is used as a phosphorus source for green synthesis of metal phosphide, and the metal phosphide is recycled. The problems of high energy consumption and high pollution in a traditional ammonia synthesis process are solved through an electro-catalysis technology, the technical and use requirements in actual production are met, and a brand-new ammonia synthesis way is provided.

According to the decalcification-free trace DNA extraction method for the old bone sample, an independent decalcification step is not adopted, a specific metal chelating agent and a phosphoramidate derivative are introduced into a bone incubation solution, the specific metal chelating agent has high chelating capacity on calcium and magnesium ions, and the specific metal chelating agent and a complex product thereof are high in water solubility and not prone to being separated out; the phosphoramidate derivative is easy to remove and does not affect the DNA adsorption efficiency of the magnetic beads and subsequent PCR amplification, the phosphoramidate derivative preferentially acts with a phosphate group fixed site on the surface of the soil, adsorption of the soil to the DNA is greatly reduced, an incubation product can be obtained to the maximum extent, then soil impurities are removed through centrifugation, and it is ensured that no adverse effect is generated on subsequent DNA adsorption of the magnetic beads. According to the method, trace DNA can be effectively extracted and purified from old bone detection materials, independent decalcification pretreatment is not needed, sample loss is avoided, and the extracted DNA can be used for forensic medicine identification.

The present application relates to the technical field of perovskite devices, and particularly relates to a packaging method of a perovskite device. The packaging method provided by the present application comprises the following steps: mixing methyl methacrylate, 2-methyl-2-acrylic acid-2-hydroxyethyl ester phosphate and 2-hydroxy-2-methyl-1-phenylpropanone to obtain a packaging slurry; coating the packaging slurry on the surface of the perovskite device, covering a glass plate, and performing light curing. The packaging method can improve the photoelectric current density of the device, thereby improving the efficiency of the device, and can significantly improve the outdoor stability of the device.

The invention provides a flotation separation method for molybdenite and bismuthite. The flotation separation method comprises the following steps that an ore sample containing the molybdenite and the bismuthite is sorted, crushed and ground to serve as a flotation sample; minerals and water are mixed to form ore pulp, and the pH value of the ore pulp is adjusted to a certain value; adding a certain amount of oxidizing agent into the ore pulp and stirring; adding a certain amount of inhibitor into the ore pulp, and stirring; a certain amount of collecting agent is added into the ore pulp, and stirring treatment is conducted; adding a certain amount of foaming agent into the ore pulp, and stirring; and S5, carrying out foam flotation on the ore pulp obtained in the step S5, respectively filtering, drying and testing a foam product and a tank bottom product after flotation, and calculating the recovery rate. The efficient and environment-friendly collecting agent and selective inhibitor are provided, efficient separation of molybdenite and bismuthite can be achieved, the utilization efficiency of mineral resources is improved, the influence on the environment is further reduced, and technical support is provided for sustainable development of mines.

The present invention relates to the technical field of coatings, and discloses a method for preparing a water-based acrylic anticorrosive coating. The present invention uses PEPA and phosphorus pentoxide as raw materials to obtain bis-PEPA-based phosphate. Using 3-hydroxyglutaric acid, aminopropyltriethoxysilane, hexamethylene diisocyanate, graphene oxide, etc. as raw materials, bis-silane-modified graphene oxide is prepared. Add bis-silane-modified graphene oxide, bis-PEPA-based phosphate, etc. to the water-based acrylic emulsion, stir and mix evenly, grind and filter, and obtain a water-based acrylic anticorrosive coating. The present invention utilizes phosphorus hydroxyl, silicon hydroxyl, and graphene in the coating, and the three cooperate to assist in improving the adhesion and corrosion resistance of the coating, and utilize flame retardant elements to improve the flame retardant properties of the coating. The water-based acrylic anticorrosive coating prepared by the present invention has excellent anticorrosion performance, flame retardant properties, and adhesion.

The invention discloses a beneficiation process for beneficiation and recovery of scheelite and fluorite from argillized tungsten polymetallic ore. The beneficiation process sequentially comprises the steps of magnetite removal, low-intensity magnetic separation mineral removal, sulphide ore removal through acidification, scheelite-fluorite mixed concentration and centrifugal separation to obtain scheelite concentrate and fluorite concentrate. By adopting magnetic separation and flotation operation, corrosion to equipment can be reduced, meanwhile, the grade and the recovery rate of the scheelite concentrate and the fluorite can be improved, and under the condition that the strong magnetic tailings contain 0.34% of tungsten and 25.65% of fluorite, the scheelite concentrate with the tungsten content of 17.96% and the accumulative recovery rate of 20.42% can be obtained through tests; the content of fluorite in the fluorite concentrate is 77.86%, and the accumulative recovery rate is 47.72%.

The application discloses a treatment system for treating strongly complexed heavy metal wastewater in an electroplating industry, comprising an oxidation reaction tank, a Fenton-like reaction tank, a homogenizing adjusting tank, a chemical mixing tank, a No. I flocculation tank, a No. I sedimentation tank, a heavy metal adsorption tank, a No. II flocculation tank, a No. II sedimentation tank and a clean water tank which are connected in sequence; wherein, the bottom of the No. II sedimentation tank is provided with two sludge discharge ports, one of which is connected with the heavy metal adsorption tank through a sludge backflow pipeline, and the other is connected with a regeneration system. The application also discloses a method for treating strongly complexed heavy metal wastewater in the electroplating industry based on the treatment system. The method adopts the process of first oxidizing and breaking the complex, then adding alkali to precipitate, and finally modifying zeolite to adsorb, so that the electroplating strongly complexed heavy metal wastewater can be treated, the concentration of heavy metal ions in the effluent can be stably reduced to below 0.1 mg / L, and the discharge standard can be reached.

The invention discloses a high-temperature superconducting raw material hafnium source and a preparation method and application thereof. The invention uses hafnium n-propoxide, 2,2,6,6-tetramethyl-3,5-heptanedione and tetrahydrofuran as raw materials, and generates tetra(2,2,6,6-tetramethyl-3,5-heptanedione) hafnium source by reacting hafnium ions with heptanedione (tmhd). In the process of synthesizing the hafnium source, "low temperature and slow speed" is adopted to control the adhesion of Hf(tmhd)4 source particles in the synthesis process, so as to obtain hafnium source crystal particles with small particles and narrow particle size distribution. The hafnium source can be used as a superconducting layer raw material with a yttrium source, a barium source and a copper source, and a YBCO film is prepared by MOCVD method, so that Hf ions are pinned in the YBCO film, and a high-temperature superconducting tape with high electrical properties under low temperature and strong magnetic field is obtained, and no agglomeration phenomenon occurs in the hafnium source during film preparation, and the deposition effect and thermal stability are good.

The invention provides a preservative as well as a preparation method and application thereof, and belongs to the technical field of preservatives. The 8-hydroxyquinoline in the preservative provided by the invention has strong coordination and chelation capabilities, and is adsorbed on the surface of a matrix through physical and chemical actions to form a protective film, so that permeation of a corrosion medium is blocked; acetylsalicylic acid can form a layer of protective film in the coating, so that the corrosion process is inhibited; carboxyglyceride can improve the flexibility and durability of the coating, and also has a certain antibacterial property, so that the corrosion resistance of the coating is enhanced; bronopol is used as a broad-spectrum preservative, can kill microorganisms by releasing active oxygen in the coating, and also can improve the antibacterial and anticorrosive properties of the coating through the synergistic effect with other preservatives; the alcohol solvent is an excellent solvent and stabilizer, and when the alcohol solvent is combined with other preservative components for use, the preservative with excellent corrosion resistance can be formed.

The invention relates to the technical field of epoxy primer, and discloses a water-based epoxy primer for trains and a preparation method thereof.The preparation method comprises the steps that diethanol amine, dodecafluoro-1, 9-decadiene, maleic anhydride and the like serve as raw materials, an intermediate 2 is prepared through a reaction, the intermediate 2 is grafted into epoxy resin under the initiation of an initiator, and the epoxy primer is prepared through a one-step reaction; the phosphoric acid is introduced into the epoxy resin through a ring-opening reaction with epoxy groups in the epoxy resin, and the water-based epoxy primer for the train is further prepared. The surface energy of the epoxy primer is reduced by using fluorine in the epoxy primer, so that the waterproof effect of the epoxy resin is improved, and the adhesive force and the anti-corrosion effect of the epoxy resin are enhanced by forming a complex with a train metal substrate by using phosphoric acid and a carboxyl structure in the epoxy primer. The water-based epoxy primer prepared by the preparation method disclosed by the invention has a relatively good waterproof effect and a relatively good anti-corrosion effect.

The present invention relates to the technical field of film-forming descaling agents, and in particular to a boiler water treatment agent based on polyamines, a preparation method thereof, and a use method thereof. The raw materials for preparing the boiler water treatment agent include: polyamines and composite chelating agents, and the molar ratio is 1: (4-6). The boiler water treatment agent provided by the present invention has a wide applicable temperature and pressure range, can withstand extreme conditions of up to 600°C and 17.8MPa, has excellent film-forming performance, can form a denser and more stable protective film layer on the metal surface, and provides reliable anti-corrosion protection. The corrosion rate of carbon steel in boiler water is as low as 0.12g / (m 2 h).

The invention discloses a star-shaped melamine hexa (ethylenediamine-N, N-diacetic acid) chelating agent as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, carrying out addition reaction on melamine and formaldehyde under a weakly alkaline condition to generate hexamethylol melamine, adding ethidene diamine before further dehydration polycondensation, and connecting ethidene diamine to melamine through condensation of hydroxymethyl and amino of ethidene diamine; and reacting with halogenated sodium acetate in the presence of alkali or alkaline salt, and grafting two-CH2COO-groups to the tail end of each branched chain to form a molecular structure which takes melamine as a mother nucleus and six branched chains with-N (CH2COOH) 2 groups at the tail ends and is distributed in a star shape. The chelating agent provided by the invention can chelate metal ions from different directions, fix the metal ions on molecules and aggregate the metal ions, and the synergistic chelating effect of adjacent branched chains enhances the chelating ability to the metal ions and the stability of the chelate. The method has the advantages of simple process, mild reaction conditions, environment-friendly and easy-to-control process, and easy realization of large-scale production.

The invention relates to a cow milk beta-casein derived intestinal zinc absorption promoting peptide and application thereof in preparation of a zinc supplement. The sequence of the peptide for promoting intestinal zinc absorption is YPVEPF, and the peptide is non-toxic, high in safety, capable of being specifically combined with Zn < 2 + >, high in zinc chelating capacity and capable of remarkably improving the zinc transport amount in a Caco-2 small intestine epithelial cell model, so that the peptide has the good activity of improving intestinal zinc absorption. The peptide capable of promoting intestinal zinc absorption can be obtained through a solid-phase synthesis method, so that large-scale production can be carried out, and the synthesized peptide capable of promoting intestinal zinc absorption is high in purity and stable in quality, and can meet current market requirements.

The invention discloses an application of a combined inhibitor in flotation separation of associated gold, silver, lead and zinc sulfide ore, the combined inhibitor is a combination of zinc sulfate and methionine, and the mass ratio of zinc sulfate to methionine is 2: 1; the combined inhibitor is used for achieving flotation separation of the associated gold and silver low-copper lead-zinc polymetallic sulfide ore in a low-alkali environment, the separation effect is good, the concentrate grade is high, the zinc content of the lead concentrate is effectively reduced, the recovery rate of gold and silver in the lead concentrate is increased, and the combined inhibitor has important significance on quality improvement and efficiency improvement of flotation separation of the associated gold and silver low-copper lead-zinc polymetallic sulfide ore. Besides, methionine in the combined inhibitor is a small-molecular organic matter, is non-toxic and pollution-free and is easy to degrade, so that the problems that a traditional inhibitor is toxic and unfriendly to the environment and human bodies are solved. The combined inhibitor is small in dosage, stable in effect and good in process application prospect.

The invention relates to the technical field of metal material surface cleaning agents, in particular to a degreasing agent special for a steel plate and a preparation method thereof. The special degreasing agent for the steel plate comprises the following components in parts by mass: 35-36 parts of an alkali washing agent, 40-41 parts of a builder, 15-16 parts of a filling agent, 0.5-1 part of a surfactant and 8-10 parts of a chelating agent, wherein the chelating agent is sodium nitrilotriacetate and sodium gluconate, and the filling agent is sodium sulfate. The degreasing agent special for the steel plate does not contain harmful substances such as heavy metal and phosphorus, pollution to the environment can be effectively reduced, the saponification reaction of oil stains is enhanced by adding the chelating agent, the cleaning effect is remarkably improved, and the degreasing agent has both environment friendliness and efficient cleaning performance.

The invention relates to the technical field of pipeline dredging agents, in particular to a preparation method of a pipeline dredging agent. According to the technical scheme, the preparation method comprises the following steps: preparing the following raw materials in parts by weight: 35-40 parts of water, 55-65 parts of a sodium hypochlorite aqueous solution, 0.8-1.2 parts of sodium hydroxide, 1.5-2.5 parts of amine oxide, 3-7 parts of sodium carboxymethyl cellulose, 8-12 parts of polyacrylamide, 12-18 parts of ethylene diamine tetraacetic acid, 18-22 parts of sodium dodecyl benzene sulfonate and 20-25 parts of modified polyvinyl alcohol. The prepared dredging agent can decompose organic matters and effectively dredge pipelines, is high in dirt-removing power, improves the viscosity of the dredging agent, prolongs the residence time of the dredging agent in the pipelines, prolongs the contact time of the dredging agent and blockages, enables the structures of the blockages to become loose, greatly increases the contact area of the blockages and the dredging agent, and improves the dredging efficiency. The dredging efficiency is improved.

The invention discloses a stable composition containing epigallocatechin gallate as well as a preparation method and application of the stable composition. The stable composition is prepared from glycerol, vitamin C, chlorogenic acid, ethyoxyl diethylene glycol and epigallocatechin gallate. The preparation method comprises the following steps: mixing glycerol and epigallocatechin gallate at room temperature, stirring and dispersing uniformly, heating to 75-80 DEG C, and stirring until complete dissolution to obtain a transparent solution which is a phase A; uniformly stirring vitamin C, chlorogenic acid and ethyoxyl diethylene glycol at room temperature to obtain a transparent solution which is a phase B; and uniformly mixing the phase A and the phase B to obtain the stable composition. The composition has the characteristics of high temperature resistance, illumination resistance and high stability, and the preparation method of the composition is simple and low in cost.

The invention belongs to the field of daily cleaning products, and specifically relates to a cleaning composition comprising gel, wherein the cleaning solution comprises a surfactant, a moisturizer, a plant extract, an antibacterial agent, and an auxiliary material; the gel is a cross-linked hydrogel, and the maximum swelling rate in water at 25°C is ≤500%, and the dry weight loss of the gel within 24 hours of the maximum swelling is ≤5% (mass); the gel accounts for 50% to 90% of the total mass of the cleaning composition comprising the gel; the gel and the cleaning solution are prepared separately, the gel swells in the cleaning solution, and the gel contacts the skin when used, which is more gentle. In addition, the gel enhances the retention time of the cleaning solution on the skin surface, and the synergistic effect of the two realizes the advantages of mildness, good biodegradability, broad-spectrum antibacterial property, and good biocompatibility, and is suitable for people with sensitive skin.

The invention discloses a cassiterite collecting agent and a preparation method and application thereof, and belongs to the technical field of mineral separation. The cassiterite collecting agent is formed by coordinating and assembling the following cinnamon hydroxamic acid ligands and metal ions with the valence of more than two: # imgabs0 #, wherein M is a monovalent cation; in the formula, R is alkoxy with 1 to 5 carbon atoms or alkyl with 1 to 5 carbon atoms. The cassiterite collecting agent has very high targeted adsorption capacity on the cassiterite surface, meanwhile has excellent hydrophobic performance, particularly can achieve selective separation of cassiterite and gangue minerals such as tourmaline and garnet and enhanced flotation recovery of fine-fraction cassiterite under the condition of very low dosage, and is low in preparation cost, good in performance, simple in process and suitable for industrial production. The method is of great significance in improving efficient comprehensive recovery of cassiterite resources and is beneficial to further popularization and application.

The invention relates to the field of sodium ion batteries, and discloses a preparation method and application of a ferrocobalt bimetallic sulfide nitrogen-doped porous carbon framework composite material. The preparation method comprises the following steps: by taking aminotriacetic acid as a ligand, chelating cobalt and iron ions through ball milling to prepare a CoFe-NTA precursor; the precursor is pyrolyzed, metal ions are subjected to carbon thermal reduction, and nitrogen-doped carbon formed by in-situ conversion of nitrilotriacetic acid can be tightly combined with ferrocobalt sulfide, so that the volume change generated during deintercalation of sodium ions can be effectively relieved, the cycling stability of the material can be enhanced, and the conductivity and the sodium ion diffusion rate of the composite material can be improved; and carrying out gas-phase vulcanization to finally obtain the ferrocobalt bimetallic sulfide nitrogen-doped porous carbon framework composite material. The nitrogen-doped porous carbon framework is beneficial to contact between electrolyte and an electrode material, active sites are fully utilized, the structural stability of the composite material can be enhanced, and when the nitrogen-doped porous carbon framework is used as a sodium-ion battery negative electrode, the nitrogen-doped porous carbon framework shows excellent sodium storage performance.

The present application relates to the technical field of gold processing, and specifically discloses a gold black water removal and its preparation method and application. The gold black water removal includes the following ingredients in parts by weight: 10-20 parts of baking soda, 4-8 parts of betaine, 1-3 parts of anionic surfactant, 6-9 parts of complex, 1-5 parts of stabilizer, 0.6-2.7 parts of enzyme preparation, and 80-100 parts of water; the complex is compounded with gluconolactone and octadecylamine; its preparation method is: baking soda, betaine, anionic surfactant, complex, and stabilizer are put into water, mixed evenly, and gold black water removal is obtained. The gold black water removal of the present application has the advantage of removing black spots without affecting the hardness of gold through the synergistic effect between the raw materials.

The invention discloses a power station boiler hydroxyapatite scaling substance chemical cleaning method, and belongs to the technical field of power station thermal equipment chemical cleaning, and the method comprises the following steps: preparing a cleaning medium containing an organic chelating agent, a penetrant, a corrosion inhibitor and demineralized water, adjusting the pH value, heating, adding a cleaning auxiliary agent, injecting into a boiler system, carrying out circulation or immersion cleaning, and flushing. And finally, the boiler system is restored to the normal working state, and cleaning is completed. The chemical cleaning method comprises the following steps: selecting a cleaning medium aiming at hydroxyapatite scaling substances, controlling the medium concentration, the pH value and the cleaning temperature, and adding a cleaning assistant in the cleaning process. The cleaning method is simple, reliable and easy to implement, and the problem that hydroxyapatite scaling substances of the power station boiler are difficult to effectively remove in a traditional chemical cleaning method is solved.

The invention discloses a metal ion-nitrogen-containing heteroaromatic complex collecting agent, a preparation method thereof and application of the metal ion-nitrogen-containing heteroaromatic complex collecting agent in tungsten ore flotation, and belongs to the technical field of ore dressing. The metal ion-nitrogen-containing heteroaromatic complex collecting agent is formed by coordinating and assembling a nitrogen-containing heteroaromatic ligand compound containing a hydroxamic acid group and metal ions with the valence of more than two, the nitrogen-containing heteroaromatic ligand compound containing the hydroxamic acid group and the molecular structure of the nitrogen-containing heteroaromatic ligand compound are as follows: # imgabs0 #, and R1, R2, R3, R4 or R5 are the hydroxamic acid group; compared with an existing Pb-BHA complex collecting agent, the tungsten-containing mineral collecting agent has higher targeted adsorption and selective collecting capacity and higher flotation rate on tungsten-containing minerals, flotation of the tungsten-containing minerals can be effectively enhanced, particularly, bulk flotation of various tungsten ores can be efficiently achieved under the condition of low dosage, and the comprehensive recovery rate of tungsten resources is greatly increased.