38 results about "Zinc cyanide" patented technology

The invention discloses a method for achieving cyanide balance in a gold concentrate cyanidation and zinc powder replacement gold extraction process. According to the method, the cyanide balance, based on water and material balance, in the gold concentrate cyanidation and zinc powder replacement gold extraction process is dynamic balance and includes the balance among the input quantity, the quantity of lost cyanide which is decomposed or oxidized or deposited in the production process, the quantity of thiocyanide, cyanate, ammonia nitrogen and others which are converted into a liquid phase or solid phase, the total quantity of cyanide in discharged contaminants such as cyanide residues and cyanidation water treatment sludge or other gases or liquids and the quantity of cyanide which is destroyed by treatment in the production process but not recovered; and meanwhile the cyanide balance shows the stock of cyanide in various facilities in the production process and the quantity of cyanide which is recycled in the production process. Products of the gold concentrate cyanidation and zinc powder replacement gold extraction process are generally crude gold ingots free of cyanidation loss.

The invention provides a nano-composite electroplating solution. The nano-composite electroplating solution is prepared from, by concentration, 23-26 g / L of cuprous cyanide, 10-12 g / L of zinc cyanide, 43-51 g / L of sodium cyanide, 25-35 g / L of sodium carbonate, 10-20 g / L of sodium potassium tartrate tetrahydrate, 4-8 g / L of ammonium chloride, 1-4 g / L of nano SiO2 and the balance water. By adding the nano SiO2, the degree of polarization of the cathode is increased, and growth of Cu-Zn alloy grains is prevented, so that a coating is more refined and compact, the porosity of a deposited layer is decreased, the particle-reinforced metal-based composite coating is formed, and accordingly the corrosion resistance of the coating is improved. It is indicated through test results that the corrosion current of the coating is greatly decreased, and it is proved that the corrosion resistance of the nano-composite coating is obviously improved compared with a Cu-Zn alloy coating. The invention further provides a preparing method of the nano-composite electroplating solution and a zinc alloy electroplated part.

The invention relates to a method for synthesizing zinc cyanurate by adopting a normal pressure method. Cyanuric acid and zinc oxide are mainly used as raw materials. The method comprises the following steps of: stirring the raw materials for 1 to 2 hours at the temperature of between 50 and 120 DEG C, drying to remove moisture, crushing the materials, and thus obtaining superfine zinc cyanurate powder with good dispersibility. The zinc cyanurate can be used for modification of an azodicarbonamide (ADC) foaming agent, is suitable for foaming of multiple rubbers of PVC, XPE, EVA and the like, and is uniform in sheet foamed holes and high in whiteness.

The invention discloses a preparation method of 4,5-difluorophthalic acid, the specific method steps are as follows: S1: Synthesis of 4,5-difluoro-1,2-phthalonitrile: add 4,5 ‑Difluoro‑1,2‑dihalobenzene and polymethylhydrogensiloxane, stirred and dissolved with N,N‑dimethylacetamide, and reacted, cooled after the reaction, and added tri( Dibenzylideneacetone) dipalladium and 1,1'-bis(diphenylphosphino)ferrocene, then slowly add zinc cyanide for reaction, after the reaction is completed, cool down and add water, and use sodium bicarbonate solution under vigorous stirring Adjust the pH to 8, stir for 2 hours and then filter, wash and elute with a mixed solvent of petroleum ether and ethyl acetate to obtain an off-white solid intermediate 4,5-difluoro-1,2-phthalonitrile; S2: Synthesis of 4,5‑difluoro‑1,2‑phthalic acid. The process of the invention is safe, efficient and easy to operate, has low requirements on equipment, low cost of raw materials, and is easy for industrialized production.

The invention provides a preparation method of an ammonium removing material of ferrous zinc sodium cyanide deammonium material and application of the deammonium material to sewage ammonium removal and belongs to the technical field of the sewage ammonium removal. A chemical formula of the ferrous zinc sodium cyanide is Na2ZnFe(CN)6; the preparation method of the material comprises the following steps: preparing a zinc salt solution and a ferrous sodium cyanide solution respectively; adding a certain mass of sodium chloride into the ferrous sodium cyanide solution to completely dissolve the sodium chloride into the ferrous sodium cyanide solution, so as to obtain a ferrous sodium cyanide and sodium chloride mixed solution; gradually dropwise adding the zinc salt solution into the mixed solution; carrying out magnetic stirring while dropwise adding the zinc salt solution; after dropwise adding the zinc salt solution, continually stirring to obtain white suspension liquid; standing and precipitating; centrifuging and separating to obtain white solids; repeatedly washing the white solids with de-ionized water to remove impurities; drying to obtain the ammonium removing material Na2ZnFe(CN). The ammonium removing material provided by the invention has the advantages of large ammonium ion adsorption capability, high adsorption selectivity, low production cost and stable performance.

The invention belongs to the technical field of pavement material engineering, and specifically discloses a negative expansion modified asphalt joint filling material and an application method thereof. The modified asphalt joint filling material of the present invention comprises: 40-62% of base asphalt, 4-10% of negative expansion material, 3-5% of expansion coordinating agent, 30-42% of filler and 1-3% of auxiliary agent, in terms of mass percentage, Total 100%. Among them, the base asphalt is SBS modified asphalt, the negative expansion material is zinc cyanide and cadmium cyanide, the expansion coordinator is sodium zirconium phosphate, the filler is calcium powder, and the additive is sodium polyacrylate or polyoxypropylene polyoxyethylene copolymer . The joint filling material of the invention can effectively control the problem of crack expansion caused by material thermal expansion and cold contraction, effectively fill the cracks in the old cement concrete pavement, play a waterproof role, and can also improve driving comfort. The joint filling material of the invention will be popularized and applied in functional maintenance of old cement concrete pavement and crack filling projects of buildings.

The invention relates to a method for treating zinc-containing cyanide barren solution, comprising the following process steps and conditions: sulfuration acidification reaction, first adding soluble sulfide to the zinc-containing cyanide barren solution, then adding concentrated sulfuric acid to carry out acidification reaction, and adjusting the pH value of the solution , add PAM, set aside for settling, solid-liquid separation Ⅰ, separate sediment Ⅰ, tail gas and supernatant, and transport sediment Ⅰ to the zinc smelting enterprise for comprehensive recycling; to neutralize the sediment, first add Alkali, adjust the pH value to 9.0-11.5 for neutralization and precipitation, then solid-liquid separation II, separate sediment II and tail water, sediment II and cyanide tailings are treated together, tail water is returned to the cyanide system for reuse, and tail gas recovery , send the tail gas produced in the first step to the absorption tower through negative pressure, add lye, separate the absorption liquid and empty the purified gas, and return the absorption liquid to neutralize the precipitation. It has the ability to efficiently remove Zn, Cu, Fe and other metals, efficient recovery of cyanide, toxic and harmful gas absorption treatment, comprehensive recovery of Zn and Cu in sediment, short process flow, simple and safe operation, easy to implement, etc., suitable for zinc-containing cyanide barren solution in gold smelting industry Handle the application.

The invention provides a method for producing disperse red 343. The method specifically comprises the following step of cyaniding intermediates A and B by using cyano alcohol in a two-phase system under catalysis of a phase transfer catalyst. According to the method, the step of cyaniding the dried intermediates A and B by cuprous cyanide and zinc cyanide reagents in a DMF (Dimethyl Formamide) solvent in the conventional process is replaced, so that pollution caused by heavy metal ions in a dye is avoided. The cyaniding process is carried out by two phases, and operation of drying the intermediates A and B is omitted, so that the energy consumption and dust pollution are reduced. The method is a brand new pollution-free and environment-friendly synthetic process.

The invention discloses a method for preparing immobilized enzyme based on a reactive adsorption method, and relates to the technical field of bionts. The method comprises the following steps: enabling reaction between two or more compounds in an enzyme-containing aqueous solution, and adsorbing and wrapping enzyme molecules by precipitates in a process of forming one or more precipitates such as calcium phosphate, calcium hydrogen phosphate, calcium carbonate, calcium hydrogen carbonate, aluminum hydroxide, calcium phytic acid, zinc ferrocyanide and chitosan organic matters to prepare the immobilized enzyme. The method is an improved adsorption method, aims to increase the bonding force between a carrier and the enzyme and to overcome the shortcoming that the immobilized enzyme has high probability of falling off, has the characteristics of simple operation, low cost and stable enzyme activity, and is worthy of being popularized and applied.

The invention provides a method for preparing zinc cyanide nanomaterials by using non-toxic raw materials, which adopts improved technological conditions and preparation technology that uses arc discharge to generate plasma, zinc granule and graphite as anode consumption components, and the graphite as cathode. The preparation is carried out in atmosphere of argon and ethanol; after the preparation, vacuumizing is carried out immediately; then air is insufflated for passivating for 1-300 hours, and finally powder depositing on a working chamber wall is collected. By using the method, zinc cyanide of nanometer size and zinc cyanide / zinc nano powder materials can be obtained steadily in large bulk. The preparation method of the invention uses the non-toxic raw materials and has short reaction time, thus being a fast and environment-friendly preparation method.

A method for removing zinc-cyanide complexes by catalytic thermal decomposition of the present invention comprises the steps of: adding a catalyst to solid zinc-cyanide complexes or raw materials containing zinc-cyanide complexes, the raw materials being prepared as mixed Raw material; the quality of the catalyst is not less than 1% of the quality of the zinc-cyanide complex contained in the raw material; the mixed raw material is put into a thermal decomposition device, heated to 250-470°C for thermal decomposition, when the temperature reaches 250-470 After 0°C, keep warm for 0-150 minutes to remove the zinc-cyanide complex and obtain thermal decomposition clinker; directly store the obtained thermal decomposition clinker or use it for backfill treatment or secondary utilization. The beneficial effects of the present invention are: under the action of catalyst, thermal decomposition and oxidation atmosphere, the clean conversion of solid zinc-cyanide complex or zinc-cyanide complex is realized, the cost is low and the effect of removing zinc-cyanide complex is good; The thermally decomposed clinker after low-temperature thermal decomposition meets the requirements of ordinary solid waste. The invention has simple process, less equipment investment, no secondary pollution, and is easy to popularize.

The invention relates to a preparation method of topiroxostat, which comprises the following steps: reacting an initial raw material compound isoniazide disclosed as Formula (6) with a compound 4-cyano-pyridyl-N-oxide disclosed as Formula (5) to generate a triazole compound disclosed as Formula (4), reacting the triazole compound disclosed as Formula (4) in the presence of a copper catalyst (CuX), zinc cyanide (Zn(CN)2) and dimethylamino formyl chloride to generate a cyanotriazole compound disclosed as Formula (3), reacting the compound disclosed as Formula (3) in the presence of p-toluenesulfonic acid to generate a compound disclosed as Formula (2), and finally, alkalifying with inorganic alkali to obtain the target compound disclosed as Formula (1) (topiroxostat). The method is simple in operation and after-treatment, and greatly lowers the consumption of the zinc cyanide due to the use of the copper catalyst, so that the reaction conditions are milder, and the purity of the prepared product is high; and the method is suitable for industrial production.

The present invention relates to CO 2 The gas conversion and utilization technology aims to provide a carbon-zinc-cobalt-supported zinc phthalocyanide heterojunction catalyst for double-light reduction of CO 2 Methods. Including: porous carbon-zinc-cobalt-supported zinc phthalocyanide heterojunction catalyst as the coating material of the cathode electrode, TiO 2 The anode electrode is made of nanotubes; the dual-light reactor adopts a transparent cavity, and the cathode electrode and the anode electrode are respectively installed, and the middle is separated by a Nafion film; the anode electrode is irradiated by the 365nm quasi-monochromatic band light of the xenon lamp, and the cathode electrode is irradiated by the visible light of the xenon lamp; Add saturated NaCl aqueous solution, add saturated NaHCO in the cathode chamber 3 aqueous solution, the CO 2 into the cathode chamber for double photoreduction reaction; the liquid products in the cathode chamber include methanol, ethanol and propanol, and the gaseous products in the cathode chamber include H 2 、CH 4 and CO. The present invention improves the CO 2 The selectivity of the reduction to liquid alcohol products; the separation efficiency of photogenerated electron-holes is improved and their recombination is inhibited, so that the double photoreduction of CO 2 The overall conversion efficiency of the reaction was increased by 50%.

The invention relates to a beneficiation method for comprehensively recovering combined silver and copper from low-grade manganese-containing ores. The beneficiation method includes crushing, ore grinding, iron reduction and leaching of copper and manganese in a sulfuric acid medium, replacement of copper with acid leaching solution, cyanide leaching of silver from acid leaching slag, and replacement of silver and copper with zinc in cyanide solution. According to the mineral properties of bound copper and bound silver that are ubiquitous in the forms of isomorphism, lattice substitution, and colloidal adsorption in manganese minerals, the present invention uses low-cost iron to realize manganese, silver, copper The chemical dissociation of the combination, the dissolution of each element in the form of ions, realized the simultaneous leaching of manganese and copper in the acid leaching solution; It enters the solid phase in the form of precipitation, and then is leached by cyanide to make it enter the liquid phase. It is combined with copper in other minerals and recovered together with zinc replacement.

The invention relates to a manganese-doped and modified zinc-ion battery cathode active material and its preparation method and application. The cathode active material comprises manganese zinc ferricyanide, and the X-ray diffraction spectrum of manganese zinc ferricyanide is at diffraction angle 2θ=9.68 °, 13.42°, 14.00°, 14.78°, 16.16°, 17.08°, 19.46°, 21.42°, 21.64°, 24.26°, 34.60° and 38.82° have absorption peaks, and the 2θ error is ±0.2; preferably, ferricyanide Manganese zinc is prepared by a method comprising the following steps: the zinc salt solution, the manganese salt solution and the ferricyanide ion solution are blended and then reacted. The positive electrode active material of the invention can improve the performance of the zinc ferricyanide positive electrode active material, and obviously improve the cycle stability of the positive electrode material.