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 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.

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.