13results about "Metal cyanides" patented technology

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 relates to the technical field of all-vanadium redox flow battery electrolyte additives, and discloses a Prussian-blue-like additive for a vanadium electrolyte as well as a preparation method and application of the Prussian-blue-like additive. Comprising the following steps: dissolving a first metal source, a second metal source and a structure stabilizer in an acid solution, and carrying out uniform dispersion treatment to obtain a uniform dispersion liquid I; dissolving ferrous cyanide salt and organic phosphonate in deionized water, and carrying out uniform dispersion treatment to obtain a uniform dispersion liquid II; performing continuous ultrasonic treatment on the uniform dispersion liquid II, and dropwise adding the uniform dispersion liquid I into the uniform dispersion liquid II to obtain a prussian blue-like precursor liquid; and carrying out heat treatment on the Prussian blue-like precursor solution to obtain the Prussian blue-like additive for the vanadium electrolyte. And the material can be used as an all-vanadium redox flow battery electrolyte additive to effectively improve the discharge capacity and the capacity retention ratio of the battery.

The present application relates to the field of metal cyanide preparation, and more specifically to a method for synthesizing zinc cyanide nanomaterials using non-toxic raw materials. The present invention uses g-C3N4 and zinc powder as raw materials and adopts vacuum sealing and sintering technology to prepare the material. The specific steps include: mixing g-C3N4 and zinc powder evenly and then loading them into a quartz tube, evacuating the quartz tube, sealing the quartz tube, placing the quartz tube in a muffle furnace and keeping it warm for a period of time, cooling it, and collecting the product in the quartz tube, i.e., zinc cyanide nanomaterial. Due to the advantages of the non-toxicity and short reaction time of the zinc cyanide nanomaterial prepared by the present invention, the present invention has good application prospects in the field of zinc cyanide nanomaterial preparation technology.

This invention provides a method for producing cyanide that can be manufactured at room temperature, a method for using a metal oxide catalyst in the manufacturing process, and a method for recovering metal using the manufacturing method. [Solution] General formula (1): JPEG2026079578000011.jpg4269 (R in equation (1)) 1 , R 2 and R 3 Each of these is independently a hydrogen atom or a monovalent organic group which may have a substituent. A method for producing cyanide, comprising the steps of: preparing a solution by dissolving compound (A) represented by in an aqueous solvent; and preparing a mixed suspension by adding a metal oxide catalyst to the solution under oxygen-free conditions, thereby oxidizing compound (A) to produce cyanide.

This invention relates to the field of cesium ion adsorption materials, specifically to an acid-controlled copper-based Prussian blue analogue, its preparation method, and its application. The invention provides a method for preparing an acid-controlled copper-based Prussian blue analogue, comprising: adding potassium ferrocyanide solution to a mixture of polyvinylpyrrolidone and a copper salt solution, followed by stirring and aging to obtain particulate copper-based Prussian blue analogue; adding the particulate copper-based Prussian blue analogue to a mixture of acid and N,N-dimethylformamide, followed by heating to obtain an acid-controlled copper-based Prussian blue analogue. This invention utilizes acid control to induce new structures and more adsorption sites in the copper-based Prussian blue analogue, thereby achieving selective and efficient adsorption of cesium ions in water, significantly reducing the interference of sodium ions on cesium ion adsorption, and making it more stable in solution.

The present application relates to a kind of copper cyanide complex wastewater high-efficiency copper removal and recycling process, comprising the following steps: (1) copper cyanide complex wastewater critical acidification-selective crystallization: by accurately controlling wastewater pH value, make copper cyanide complex directional recombination generate insoluble CuCN crystal;(2) cyclone enhanced crystallization: by water cyclone, CuCN crystal and overflow liquid are separated;(3) composite sulphidizing agent gradient activation deep copper removal: by adjusting pH value and adding composite sulphidizing agent, make micro CuCN particle and dissolved low coordination copper cyanide complex reaction generate insoluble CuS crystal;(4) magnetic seed enhanced separation: using modified magnetic seed and weak magnetic separator magnetic separation, CuS magnetic flocculation is separated from wastewater, and finally purified tail liquid is obtained.The closed-loop process of the present application can efficiently remove and recover copper in copper cyanide complex wastewater, and the purified tail liquid can be used for cyanide leaching operation, significantly reduce the consumption of sodium cyanide and improve gold and silver leaching rate, truly realize wastewater zero discharge and copper resource full recovery.

The invention discloses a sulfur-doped Prussian blue-like nano hollow box as well as a preparation method and application thereof, and relates to the technical field of material science. The preparation method comprises the following steps: S1, dissolving nitric acid transition metal salt, transition metal chloride salt and trisodium citrate in deionized water, and stirring to obtain a solution A; s2, dissolving potassium ferricyanide in deionized water to obtain a solution B; s3, mixing the solution A and the solution B, stirring, standing, and centrifugally washing to obtain the Prussian blue analogue. And S4, dispersing the obtained Prussian blue analogue in an ethanol solution, transferring into a high-pressure hydrothermal kettle, adding a certain amount of sulfide salt into the high-pressure hydrothermal kettle, putting into a drying oven, reacting at a certain temperature, naturally cooling, centrifuging to obtain a precipitate, and washing to obtain the sulfur-doped Prussian blue-like nano hollow box. According to the sulfur-doped Prussian blue-like nano hollow box as well as the preparation method and the application thereof, the photo-thermal performance and the catalytic performance of the Prussian blue-like nano hollow box are improved.

Methods for rapid removal of carbon monoxide (CO) from CO-bound hemoglobin, myoglobin, and cytochrome c oxidase in a subject poisoned with CO are described. The disclosed therapy involves the use of a rationally designed, modified CO metabolic regulator (RcoM) protein and pharmaceutical compositions thereof that clear carbon monoxide from the poisoned tissue. Recombinant RcoM compositions are infused into the blood, where they rapidly sequester carbon monoxide and limit the toxic effects of carbon monoxide on cellular respiration, oxygen delivery, and oxygen utilization.

In vitro and in vivo methods of removing carbon monoxide from hemoglobin in blood or animal tissue are described. Methods of treating carboxyhemoglobinemia (carbon monoxide poisoning) in a subject are also described. The methods include administering natural or artificial oxygen carriers that are in their reduced form. Methods of producing a reduced oxygen carrier are further described. Methods of treating cyanide poisoning or hydrogen sulfide poisoning with oxygen carriers are also described.

The present application relates to the field of electroplating technology and discloses a method for synthesizing potassium gold cyanide from gold-plated waste. The present application rationally utilizes gold-plated waste in the electroplating industry. By using a combined reducing agent to recover and purify the gold-containing solution obtained from the gold-plated waste, the gold mud reduction time can be shortened and the gold mud reduction efficiency can be improved. The purified gold mud is reacted with potassium cyanide and hydrogen peroxide in a one-step reaction to synthesize potassium gold cyanide. This method not only has a high yield and purity, but is also simpler and safer than conventional processes. It is conducive to the large-scale synthesis and recycling of gold salts from gold-plated waste and the mass production of gold-containing ore mining, providing an environmentally friendly, low-cost, and high-yield process route for the future production of potassium gold cyanide.

The present invention belongs to the technical field of organic fluorine compounds, and specifically provides a continuous preparation method of 3-nitro-4-cyanobenzotrifluoride, S1: 3-nitro-4-methylbenzotrifluoride, bromine and free radical initiator are passed into the first continuous reactor containing bromination anhydrous solvent to generate 3-nitro-4-bromomethylbenzotrifluoride; S2: 3-nitro-4-bromomethylbenzotrifluoride obtained by S1 and cuprous cyanide are passed into the second continuous reactor containing cyanide anhydrous solvent to generate 3-nitro-4-cyanobenzotrifluoride crude product, and filtered to separate the copper-containing filter cake, and the obtained filtrate is distilled to obtain 3-nitro-4-cyanobenzotrifluoride crude product; S3: copper-containing filter cake regeneration cycle; S4: the crude product obtained in S2 is subjected to reduced pressure distillation to obtain high-purity 3-nitro-4-cyanobenzotrifluoride. Cuprous cyanide regeneration can be achieved by the above steps, and efficient utilization of resources is achieved.

The application discloses a Prussian blue analogue self-supporting anode for an anion exchange membrane water electrolyzer, and a preparation method thereof, which comprises the following steps: reacting pretreated nickel foam (NF) with a metal salt solution, and then performing sulfidation treatment and nitrogen reduction treatment to prepare a metal sulfide nanomaterial rich in defects; and performing coordination reaction on the metal sulfide nanomaterial with citric acid and potassium ferricyanide to obtain Fe-coordinated Prussian blue analogue material CoFePBA@NiCo2S4 / NF. The self-supporting anode obtained by the application has excellent catalytic activity and stability, and the preparation method involved is relatively simple, the reaction condition is mild, the cost is relatively low, and the application is suitable for popularization and application.