233 results about "Cyanation" patented technology

The invention provides a cyanide-containing wastewater resource recovery and cyclic utilization method, and belongs to the technical field of environmental protection and water treatment. According to the method, firstly, copper is collected through sulfuration under the weak acid condition with the pH being 5-6, so that a copper-cyanogen complex ([Cu (CN) 43-]) in wastewater is converted into a mixed material of copper sulfide (CuS) and cuprous cyanide (CuCN), and primary recovery of copper is achieved; and then, adding a pH regulator 2 to control the pH of the reaction system to be 9-11, adding a separation agent to control the ORP of the reaction system to be-400mV to-200mV, and carrying out a separation reaction. In the process, cuprous cyanide reacts with free cyanide (CN <->) to generate a soluble copper-cyanogen complex, and copper sulfide is retained, so that cuprous cyanide is accurately separated from the copper-containing material, the content of cyanide in the material is reduced, and the obtained copper-containing material meets the requirements of industrial product quality standards and pollution control standards; the problems that in the prior art, the cyanide content in the copper-containing material obtained by recycling copper from the cyanide-containing wastewater exceeds the standard, and the environmental risk is high in storage, transportation and comprehensive utilization are solved.

The invention relates to an efficient copper removal and recycling process for copper-cyanogen complex wastewater, which comprises the following steps: (1) critical acidification-selective crystallization of the copper-cyanogen complex wastewater: directionally recombining a copper-cyanogen complex to generate insoluble CuCN crystals by accurately regulating and controlling the pH value of the wastewater; (2) rotational flow enhanced crystallization: separating CuCN crystals from overflow liquid through a hydrocyclone; (3) gradient activation of a composite vulcanizing agent for deep copper removal: enabling the fine CuCN particles and the dissolved-state low-coordination copper-cyanogen complex to react to generate insoluble CuS crystals by adjusting the pH value and adding the composite vulcanizing agent; and (4) magnetic seed enhanced separation: carrying out magnetic separation by adopting modified magnetic seeds and a low-intensity magnetic separator, separating CuS magnetic flocs from the wastewater, and finally obtaining purified tail liquid. According to the closed-loop process, copper in the copper-cyanogen complex wastewater can be efficiently removed and recovered, the purified tail liquid can be reused for cyanidation leaching operation, the unit consumption of sodium cyanide is remarkably reduced, the leaching rate of gold and silver is increased, and zero discharge of wastewater and full recovery of copper resources are truly achieved.

The invention discloses a method for quantitatively testing the content of organic carbon and disseminated particle size in gold ore, and belongs to the technical field of gold ore detection. The method comprises the steps of sample preparation and quantitative testing, wherein palm wax serves as a cementing agent, barite serves as a standard sample, and a to-be-tested sample is prepared through melting, mixing, consolidation, polishing and carbon spraying; the quantitative test is based on an automatic process mineralogy test system, palm wax backgrounds are removed through backgrounds deduction, an energy spectrum library is established to recognize organic carbon and barite particles, the area ratio of the organic carbon and the barite particles is measured, the mass ratio is converted by combining the density ratio, the organic carbon content of raw ore is inversely calculated, and meanwhile, the particle size distribution of the organic carbon is counted. The method solves the problem that the content and granularity of organic carbon cannot be accurately quantified at the same time in the prior art, has the advantages of high test precision, high efficiency, comprehensive parameters and simplicity and convenience in operation, and can provide key data for optimization of a gold ore cyanidation leaching process.

The invention discloses a carbamoyl-substituted diarylethene derivative as well as a preparation method and application thereof, and the preparation method comprises the following steps: reacting R-substituted 3-bromo-2-hydroxybenzaldehyde with an arylmethyl triphenylphosphonium bromide compound or an aryl acetic acid compound to obtain an intermediate A; then the intermediate A and cuprous cyanide are subjected to a heating reaction in N, N-dimethylformamide and nitrogen atmosphere, and an intermediate B is obtained; and finally, heating the intermediate B, acetaldoxime and indium trichloride in toluene for reaction to obtain the carbamoyl-substituted diarylethene derivative. The carbamoyl-substituted diarylethene derivative disclosed by the invention has a remarkable effect in an in-vitro anti-tumor activity test, particularly has excellent anti-proliferation ability to human BRCA mutant tumor cells, and can be used for preparing medicines for treating PARP-1 activity abnormity related diseases. The synthesis route is simple, the cost is low, and large-scale implementation is facilitated.

The invention provides a process for removing cyanide from a cyanide-bearing aqueous fluid, the process comprising: (i) adding a solid composition comprising a first mixed-metal cyanide complex comprising copper and iron to a cyanide-bearing aqueous fluid comprising free cyanide and metal-complexed cyanide, wherein at least a portion of the first mixed-metal cyanide complex dissolves, with complexation of the copper by the free cyanide, to produce an aqueous solution comprising cyanometallates, the cyanometallates comprising copper cyanide and iron cyanide complexes derived from the first mixed-metal cyanide complex; (ii) contacting the aqueous solution with an anion-exchange absorbent to absorb the cyanometallates, thereby producing a cyanide-lean aqueous fluid; (iii) extracting the anion-exchange absorbent comprising the absorbed cyanometallates with at least one non-acidic aqueous extractant to produce an aqueous extract comprising the copper cyanide and iron cyanide complexes; and (iv) acidifying the aqueous extract to produce a precipitate comprising a second mixed-metal cyanide complex comprising copper and iron.

This invention discloses a method for recycling and reusing cyanide silver plating wastewater. The method includes four steps: separation of silver ions and cyanide, concentration of the silver-containing solution, cyanide concentration, electrolysis and residual liquid recycling, and reuse of reclaimed water. This method achieves the separate recycling and reuse of silver, cyanide, and water. The silver-containing solution is electrolyzed to obtain metallic silver, the cyanide concentrate's main component is sodium cyanide or potassium cyanide solution, and the reclaimed water with a conductivity below 20 μS / cm is reused in the production line. This method not only maximizes resource utilization and reduces wastewater discharge, but also separates most of the cyanide from the silver-containing solution during electrolysis, making the electrolysis process safer. Furthermore, the residual liquid after electrolysis can be recycled multiple times for the separation and concentration of silver ions and cyanide.

The invention relates to a gold oxide ore carbon slurry cyaniding smelting extraction method which comprises the following steps: 1) pretreating ore pulp: adding lime milk into gold oxide ore powder, adjusting the pH value to be greater than 10.5 to obtain ore pulp, then adding a pretreating agent, and fully and uniformly mixing to obtain pretreated ore pulp; (2) synchronous cyaniding leaching and adsorption are conducted, specifically, the pretreated ore pulp is subjected to synchronous leaching and adsorption, in the process, the concentration of free cyanogen is controlled to be 0.04%-0.06%, the PH value is controlled to be larger than 10.5, the concentration of a carbon adsorbent is controlled to be 18-22 g / L, and a gold loading material is obtained; the gold loading material is desorbed till the gold concentration in a desorption solution is smaller than or equal to 0.2 mg / L, desorption is stopped, a pregnant solution is obtained and then electrolyzed, when the gold concentration is smaller than or equal to 0.2 mg / L, electrolysis is stopped, scraping is conducted, and gold mud is obtained, and (4) smelting and aftertreatment are conducted, the gold mud is smelted and subjected to aftertreatment, and gold is obtained.The process has the advantages of being small in cyanide consumption and the like.

This invention discloses a catalyst for the production of p-cyanobenzoic acid and its preparation method, belonging to the field of catalyst technology. The method includes the following steps: adding an organic ligand solution dropwise to a cobalt source, stirring, aging, centrifuging, collecting the solid phase and washing to obtain a cobalt-based MOF framework; dispersing the cobalt-based MOF framework in a copper source, stirring, filtering, and collecting the solid phase to obtain copper-cobalt doped particles; dispersing reduced graphene oxide in deionized water, adding sodium alginate, stirring evenly, adding copper-cobalt doped particles and ammonium dihydrogen phosphate, continuing stirring, standing, centrifuging, collecting the lower gel precipitate, washing, and vacuum freeze-drying to obtain an aerogel precursor; carbonizing the aerogel precursor in a hydrogen-argon mixed atmosphere, cooling, and grinding to obtain the catalyst. The catalyst prepared by this invention can efficiently catalyze the cyanation reaction of p-bromobenzoic acid, improving the yield and purity of the target product, while also possessing excellent recycling performance.

The application provides a method for recovering valuable metals and cyanide in cyanide tail liquid based on pulse current diaphragm electrolysis, and belongs to the field of wastewater treatment, wherein a diaphragm electrolysis device is assembled to separate an anode chamber and a cathode chamber by an ion exchange membrane; an alkaline electrolyte solution is added into the anode chamber, and a cyanide tail liquid to be treated is added into the cathode chamber; a single pulse current is used for electrolysis reaction, and the cathode chamber is continuously aerated; after the reaction is completed, the cathode electrolyte is determined to calculate the cyanide recovery rate and the valuable metal recovery rate. The application can efficiently, lowly and selectively recover valuable metals in the cyanide tail liquid under alkaline conditions, and can effectively recover cyanide at the same time, overcomes the limitations of the traditional electrolysis method, and has important economic and environmental significance.

The invention discloses a method for preparing substituted imidazole by taking acyl chloride as a raw material, belongs to the technical field of synthesis of fine chemicals, and aims to solve the problems that the raw material structure is complicated, the source is limited, the raw material needs to be prepared in advance and the cost is low in the existing method for synthesizing substituted imidazole. The reaction conditions are harsh, the reaction time is long, and a transition metal catalyst needs to be used. The method comprises the following steps: synthesizing 2-substituted-4-dimethylamino-5-cyano imidazole from acyl chloride, tetramethylguanidine and a cyaniding reagent at a certain temperature and under an alkaline condition; according to the method disclosed by the invention, the 2-substituted-4-dimethylamino-5-cyano imidazole is synthesized in one step by taking the acyl chloride as the substrate, the reaction rate is greatly accelerated by selecting various acyl chlorides and alkali and synergistically and reasonably controlling the ratio of various substances, efficient synthesis of the 2-substituted-4-dimethylamino-5-cyano imidazole is realized, and the substrate is good in adaptability and high in yield. The method has wide application prospects in the fields of chemistry, biology, medicine and the like.

The invention belongs to the technical field of medicine synthesis, and particularly relates to a preparation method of topiromilast. The preparation method comprises the following steps: taking a compound 1, namely 4-(1H-1, 2, 4-triazole-5-yl)-pyridine, and a compound 2, namely 2-cyanopyridine-4-formaldehyde as raw materials, and reacting under the action of a free radical initiator and a catalyst; and performing post-treatment to obtain the target compound topiromilast. According to the invention, the problems of low yield, use of a highly toxic cyaniding reagent and the like caused by construction of a triazole ring or introduction of a cyano group are avoided; the yield and the purity of the product are improved, the post-treatment operation is simple, and the method is suitable for industrial production.

The application discloses a method for improving recovery rate of extremely fine-grained gold ore by multi-process cooperation and belongs to the field of gold leaching by a wet method.According to different occurrence states of the extremely fine-grained gold ore, the application sequentially carries out phased and targeted recovery in the order of flotation, magnetic separation, alkali leaching pretreatment and cyanide leaching, or sequentially carries out phased and targeted recovery in the order of alkali leaching pretreatment, cyanide leaching, cyanide breaking, flotation and magnetic separation.Through the multi-process cooperative process, the application realizes phased and accurate recovery of gold in different occurrence states in the extremely fine-grained gold ore, significantly improves the total recovery rate of gold, and has the advantages of mild process, controllable cost and good environmental protection, thereby providing a new technical scheme for efficient recovery of extremely fine-grained refractory gold ore and having a wide industrial application prospect.

The invention belongs to the technical field of medicine synthesis, and discloses a preparation method of a sodium nitroprusside raw material medicine. According to the method, weak acid is adopted for catalysis, the effect of remarkably reducing generation of toxic substances such as cyanide and nitrogen dioxide is achieved by controlling the material dripping speed and the dripping pH, the reaction is mild, the technological operation is safe and controllable, and industrial production of the sodium nitroprusside raw material medicine is facilitated. According to the preparation method of some examples, silica gel filtration is used for post-treatment, the residual risk of impurities such as sodium ferricyanide, ferric ferrocyanide and ferric ferricyanide is reduced, and the purity of the raw material medicine is larger than or equal to 99.9% and is far superior to the requirements of pharmacopoeia of various countries.

The utility model belongs to the technical field of separation devices, and relates to a cyanidation tailing secondary gold recovery device which comprises a reaction barrel, a gear ring is arranged at the upper end of the reaction barrel, first equal-row sawtooth grooves are formed in the inner side of the gear ring, and a limiting block is located on the inner side of the reaction barrel and rotationally connected with the reaction barrel. A first equal-column sawtooth block is slidably clamped to the inner side of the limiting block, the lower end of the first equal-column sawtooth block is fixedly connected with a secondary filtering barrel, a second equal-column sawtooth groove is formed in the inner side of the first equal-column sawtooth block, and a second equal-column sawtooth block is slidably connected to the inner side of the second equal-column sawtooth groove; the lower end of the second equal-row sawtooth block is fixedly connected with a first-stage filtering barrel, and a driving assembly is arranged on the inner side of the reaction barrel. According to the utility model, tailings with larger particles are recovered through the primary filter vat, and finer and purer tailings components are recovered from the secondary filter vat, so that cyanidation tailings on the inner sides of the primary filter vat and the secondary filter vat are subsequently recovered with different precisions.

The invention relates to the field of polyacrylate photoresists, in particular to a photoresist film-forming resin raw material and a preparation method thereof.The preparation method comprises the steps that cyclopentadiene is dropwise added into a mixed solution of alpha-bromomethyl acrylate and a solvent, the temperature is controlled, a reaction is conducted for 4 h, and 5-bromodicyclohept-2-ene-5-carboxylic acid methyl ester is prepared; the preparation method comprises the following steps: adding alkali into 5-bromo dicycloheptyl-2-ene-5-carboxylic acid methyl ester, and hydrolyzing at 20-30 DEG C for 2 hours to obtain a hydrolysis product; the hydrolysis product is subjected to epoxidation and hydrolysis with hydrogen peroxide under the condition of glacial acetic acid, and 1-bromine-5-hydroxy-3-oxa-tricyclic nonyl-2-ketone is obtained; according to the method, 1-bromo-5-hydroxy-3-oxa-tricyclic nonyl-2-ketone is cyanided by cuprous cyanide to prepare the 1-cyano-5-hydroxy-3-oxa-tricyclic nonyl-2-ketone monomer, and the method has the advantages that the raw materials are convenient and easy to obtain, the route is short, the reaction conditions are relatively mild, the operation safety is relatively high, the total yield is remarkably improved, and the like.

The invention belongs to the technical field of synthesis of pesticide intermediates, and discloses a preparation method and application of indazole carboxylic acid. The preparation method of the indazole carboxylic acid comprises the following steps: (1) cyanation reaction: reacting a brominated indazole compound with cuprous cyanide in an organic solvent in a protective gas atmosphere to obtain a cyano indazole compound; and (2) hydrolysis reaction: hydrolyzing the cyano indazole compound prepared in the step (1) to obtain indazole carboxylic acid. The preparation method disclosed by the invention is mild in condition, low in cost, safe to operate and environment-friendly. The use of highly toxic chemical raw materials and expensive raw materials is avoided, and the yield of the target product is high.

The invention provides a chemical oxidation pretreatment agent system and a method for treating low-grade high-sulfur gold ore through the chemical oxidation pretreatment agent system, and belongs to the technical field of metal hydrometallurgy. According to the method, a pretreatment agent system is designed, and low-grade resources are economically and efficiently recycled by optimizing the whole technological process of sulfur separation enrichment, targeted pretreatment and concentrated leaching and key operation parameters. According to the method, firstly, high-sulfur ore is artificially divided into high-sulfur first-section gold concentrate and low-sulfur second-section gold concentrate through ore grinding and flotation, and most sulfide wrapping gold is concentrated in the high-sulfur first-section gold concentrate; and then, the high-sulfur first-stage gold concentrate is subjected to a pretreatment process, and the wrapping structure of sulfide on gold is deeply destroyed selectively through superfine grinding and a pretreatment agent, so that the subsequent cyanidation leaching rate is effectively increased. Through fine grinding, flotation and step-by-step pretreatment, the pretreatment amount and the total treatment amount in follow-up cyanidation leaching are reduced, and the overall energy consumption and cost of cyanidation leaching of the low-grade high-sulfur-content gold ore are reduced from the source.

A method of preparing a thermoplastic resin including kneading and extruding an alkyl acrylate-aromatic vinyl compound-vinyl cyanide compound graft copolymer (A), or an alkyl acrylate-aromatic vinyl compound-vinyl cyanide compound graft copolymer (A) and a matrix resin (B) including one or more selected from the group consisting of an aromatic vinyl compound, a vinyl cyanide compound, an alkyl methacrylate, and an alkyl acrylate. A total content of the alkyl acrylate included in the thermoplastic resin is 20 to 50% by weight. An alkyl acrylate coverage value (X) of the thermoplastic resin as calculated by Equation 1 (X={(G−Y) / Y}×100) is 65 or more. In Equation 1, G represents a total gel content (%) of the thermoplastic resin, and Y represents a content (% by weight) of the alkyl acrylate in the gel of the thermoplastic resin.

This invention provides a method for producing vitamin B12 using microchannel reaction technology. The method involves acidifying, hydrolyzing, filtering, and analyzing the vitamin B12 fermentation broth, followed by a cyanidation reaction in a microchannel reactor. Further filtration, analysis, and concentration yield vitamin B12. This method produces cyanide-treated vitamin B12 with a thorough conversion reaction and increased yield. It also reduces the amount of cyanide used, thus reducing pollution and costs. The equipment has good airtightness, and the small amount of hydrogen cyanide gas generated is completely recovered and centrally treated, greatly reducing harm to the environment and human health. This method is environmentally friendly and contributes to green production.

The invention provides a reflective integrated electrochromic device. The reflective integrated electrochromic device sequentially comprises a first substrate layer, a working electrode layer, an integrated electrochromic layer, a counter electrode layer and a second substrate layer, the integrated electrochromic layer comprises a metal source compound; the metal source compound is selected from silver chloride, silver acetate, silver nitrate, silver perchlorate, silver sulfate, silver cyanide, silver sulfide, silver hexafluorophosphate, silver tetrafluoroborate, silver tetrachloroaluminate, silver trifluoromethanesulfonate, silver bis (trifluoromethane sulfonimide), copper fluoride, copper chloride, copper cyanide, copper sulfate, copper acetate, copper aluminate, cuprous fluoride, cuprous chloride, cuprous cyanide, gold chloride and gold cyanide; the catalyst is one or more of gold sulfide, gold chloride, gold (II) sulfide, nickel chloride, nickel sulfate, cobalt chloride and platinum chloride. The device has a relatively large transmittance / reflectivity dynamic change range, can perform light and heat management at the same time, and can keep a stable coloring or fading state for one month or even several months under a no-load condition.

The present invention aims to provide a resin composition which is excellent in coloring property and mold release property during injection molding. According to the present invention, there is provided a resin composition which contains a copolymer (A) having styrene-based monomer units and cyano-based vinyl monomer units, and a mold release agent (B) selected from at least one kind of fatty alcohol having 16 or more carbon atoms, fatty acid, the content of the mold release agent (B) being 200 to 800 ppm, and the transmittance being 40% or more at an optical path length of 115 mm and a wavelength of 450 nm.

The application discloses a preparation method of a modified polymer electrolyte, comprising the following steps: (1) mixing a modifier solution and a polymer matrix solvent uniformly to obtain a slurry, coating the slurry on a diaphragm, and obtaining a modified polymer film after drying; the modifier is selected from one or more of lithium ferrocyanide, lithium ferricyanide, lithium cuprocyanide and lithium cobalt cyanide; the polymer matrix is selected from one or more of polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene, polyethylene oxide, polyacrylonitrile, polyvinyl alcohol and polymethacrylate; (2) immersing the modified polymer film into an electrolyte, and obtaining the modified polymer electrolyte after drying. The prepared modified polymer electrolyte has the advantages of a wide electrochemical window, a high lithium ion transference number and high ionic conductivity; and a solid battery assembled by using the modified polymer electrolyte has the advantages of high capacity, high initial efficiency and high stability.

The invention belongs to the technical field of metal surface treatment, and particularly relates to application of an HEDP cadmium plating improvement process to a connector. In order to meet the requirements of the cyanide-free cadmium plating process of the aerospace electric connector and the limitation of cyanide, the cyanide-free cadmium plating bath solution provided by the invention comprises the main components of cadmium oxide, HEDP, KOH, a softening agent and a brightening agent, the softening agent is triethanolamine, citric acid and octylphenol polyoxyethylene ether, and the brightening agent is nickel sulfate and Turkey butter. By the adoption of the method, the plating speed can be increased, highly toxic cyanide is completely abandoned, and meanwhile the core indexes such as the uniform plating capacity and the deep plating capacity of the plating solution can be comparable with those of cyaniding cadmium plating.

The embodiment of the invention provides a bromo-ethyl difluoroacetate-mediated novel amide dehydration cyaniding method, which comprises the following steps of: heating and reacting 0.2 mmol and 1.0 equivalent weight of amide compound and 0.6 mmol and 3.0 equivalent weight of bromo-ethyl difluoroacetate for 24 hours under an oil bath condition of 90 DEG C to generate an experimental reactant; concentrating the experimental reactant under reduced pressure to obtain a residue; and purifying the residue by silica gel rapid column chromatography to obtain the target product nitrile compound. According to the scheme, the process reaction conditions are mild, a strict anhydrous and anaerobic environment is not needed, the harsh requirements on equipment and operation are greatly reduced, and the production safety and practicability are improved. Acetone is used as a solvent, so that high-efficiency reaction can be realized, the solvent after reaction is convenient to recycle and recycle, the production cost and the environmental burden are remarkably reduced, and the remarkable green chemical engineering characteristic is embodied.

The invention relates to the technical field of organic chemistry, in particular to a method for efficiently constructing a thiocyano substituted aromatic organic intermediate, which is characterized in that a reaction system consisting of CFBSA and KSCN is utilized, acetonitrile is used as a solvent, aromatic amine, indole and aromatic ring compounds are used as reaction substrates to generate thiocyanation reaction at room temperature, and the thiocyano group is efficiently introduced. The method has the advantages of low price, environmental friendliness, convenience in use, simplicity and convenience in operation, insensitivity to water and oxygen, no need of metal catalysis, wide substrate application range and application to thiocyanation reaction of aromatic amine compounds, indoles and phenols through thiocyanate sources such as KSCN, NH4SCN and the like.

A process for the hydrocyanation of an organic compound containing at least one olefinic group comprising reacting the organic compound with hydrogen cyanide in the presence of a catalyst complex comprising at least one transition metal and a phosphorus-containing ligand comprising a calixarene backbone and at least two aryl phosphite or aryl phosphoramidite groups chemically bonded to the backbone.

According to the preparation method of sulfoxaflor, provided by the invention, 3-[1-(methylthio) ethyl]-6-(trifluoromethyl) pyridine is taken as a raw material, and is subjected to an S-imidization reaction in the presence of DPPH and an ionic liquid [Bmin] BF4 to prepare a sulfimide compound B; the sulfoxaflor is finally prepared through an N-cyanation reaction of the sulfoxaflor compound B and AIBN in the presence of cuprous iodide, potassium carbonate and [Bmin] BF4, the preparation method of the sulfoxaflor is short in synthesis route, the ionic liquid is creatively used as the reaction solvent, the sulfoxaflor is more environmentally friendly, the reaction can be promoted, and the preparation method of the sulfoxaflor is suitable for industrial production. The reaction time is shortened, and the target product can be prepared with high yield (the total yield of two steps is 81% or above) and high purity (99.5%).

The invention provides an amidoxime group modified graphdiyne material and a preparation method thereof. The preparation method comprises the following steps: (1) preparing graphdiyne through in-situ growth on a template; (2) carrying out cyanation modification on the graphdiyne; and (3) carrying out amidoximation reaction on the graphdiyne subjected to cyanation modification. Before amidoximation reaction, the cyan-modified graphdiyne-template composite material can be selectively dispersed in an oxidizing agent, the template is removed through etching of the oxidizing agent, and then the amidoxime-modified graphdiyne material is prepared. According to the invention, terminal alkyne dispersed by graphdiyne is utilized, and amidoxime groups are grafted through chemical modification, so that the introduced groups are far away from one another and are distributed in a free state. The prepared amidoxime group modified graphdiyne material has excellent selectivity on uranium element, and can be used for high-selectivity seawater uranium extraction and efficient separation of uranium and vanadium elements.

The invention discloses a method for improving the recovery rate of ultra-micro-fine particle disseminated gold ore through multi-process cooperation, and belongs to the field of wet gold leaching. According to different occurrence states of the ultra-fine particle gold ore, staged and targeted recovery is sequentially carried out according to flotation, magnetic separation, alkaline leaching pretreatment and cyanidation leaching. Or sequentially performing staged and targeted recovery according to alkaline leaching pretreatment, cyanidation leaching, cyanide breaking, flotation and magnetic separation. According to the method, by means of a multi-process collaborative process, staged accurate recovery of gold in different occurrence states in the ultra-fine particle gold ore is achieved, the total recovery rate of gold is remarkably increased, the process is mild, the cost is controllable, the environmental protection property is good, a new technical scheme is provided for efficient recovery of the ultra-fine particle gold ore difficult to treat, and the method has wide industrial application prospects.

The embodiment of the invention provides a preparation method and application of a nickel potassium ferrocyanide template adsorbent. The method comprises the following steps: providing a cesium ferrocyanide solution; performing first mixing on the cesium ferrocyanide solution and a nickel source to obtain a cesium nickel ferrocyanide precursor; and carrying out second mixing on the cesium nickel ferrocyanide precursor and a potassium salt solution to obtain the potassium nickel ferrocyanide template adsorbent. The potassium nickel ferrocyanide template adsorbent prepared by the method disclosed by the invention has relatively good selective adsorption capacity on cesium ions in a cesium-containing solution, and is particularly suitable for adsorbing Cs < + > in a high-salt solution.