31 results about "Iron cyanide" patented technology

The present invention relates to a continuous bipolar electrochemically based reactor for the purpose of destroying free cyanide by direct and indirect oxidation and removing its strong complexes like ferrocyanide and ferricyanide by electrocoagulation. The designed reactor consists of four main sections, including electrooxidation, hydraulic mixing, electrocoagulation, and precipitation tank. The order of sections results in having a combination of reactions which separately remove cyanide and its compounds. The designed reactor shows a high flexibility in terms of handling highly variable kinds and concentrations of cyanide in the industrial wastewater effluents.

The invention discloses a preparation method of a cobalt diiron tetraoxide-carbon cloth lithium battery anode material. The preparation method comprises the following steps: providing a Berlin blue solution, wherein raw materials of the Berlin blue solution comprise a cobalt salt and an iron-cyanide salt; using the Berlin blue solution to soak carbon cloth so as to obtain a precursor/carbon cloth composite material; and carrying out heat treatment on the precursor/carbon cloth composite material. According to the preparation method disclosed by the invention, the composite material that CoFe2O4 is grown on a carbon cloth substrate is prepared in an in-situ manner. The manufacturing process of the electrode can be simplified, a direct electron transfer path between an active material and a current collector is provided, and meanwhile huge volume expansion in the lithium intercalation and deintercalation process can be relieved. The cobalt diiron tetraoxide-carbon cloth lithium battery anode material can serve as a lithium battery anode without a binding agent, and the lithium battery anode material has relatively high capacity, outstanding cycle stability and excellent rate capability. Meanwhile, the anode material can be used for assembling a flexible lithium ion battery, and can be applied to more fields.

The invention discloses a suspension magnetizing roasting cyanide breakage-weak magnetic separation iron extraction device for high-iron cyanide tailings. A venturi dryer, two cyclone preheaters and apre-oxidation suspension roasting furnace communicate with one another in series. The pre-oxidation suspension roasting furnace comprises a combustor and air inlets. The upper portion of the pre-oxidation suspension roasting furnace communicates with a heat separation cyclone barrel through a pipeline, the heat separation cyclone barrel, a first flow sealing valve and a suspension reducing roasting furnace communicate with one another in series, and the suspension reducing roasting furnace communicates with a coal gas source and a nitrogen source. A discharging outlet of the suspension reducing roasting furnace, a second flow sealing valve, a first cooling cyclone barrel, a second cooling cyclone barrel, a third cooling cyclone barrel and a collecting bin communicate with one another in series. An outlet of the collecting bin cooperates with an inlet of a first-stage ore grinding machine, and the first-stage ore grinding machine, a first-stage weak magnetic separation machine, a second-stage ore grinding machine and a second-stage weak magnetic separation machine cooperate with each other in sequence. An air outlet of the first cyclone preheater communicates with a dust collectorand an induced draft fan in series. The suspension magnetizing roasting cyanide breakage-weak magnetic separation iron extraction device for the high-iron cyanide tailings has the advantages of beinghigh in heat transfer and mass transfer efficiency, thorough in cyanide decomposition, high in processing capacity and high in adaptability, being suitable for large-scale industrial production and the like.

The invention discloses the measurement method for the cane sugar. Its method includes the water solution of cane sugar, the reaction of Reducing Sugar and iron cyaniding potassium, second iron cyaniding the electric potential titration of the potassium. The method of the invention has to operate easily, measurement result stability credibility, the measurement variation coefficient of result is small, the error margin is small, but it is easy to carry out instrument to turn.

The invention discloses a method for remedying cyanide contaminated soil through an alkali solution phase transfer technology. The cyanide contaminated soil is used as a study object, cyanide (mainly iron-cyanide complex) is selected as a target contaminant, the manner of full contact of an alkali solution and cyanogen-containing soil is adopted, maximum-degree liquid phase transfer of soil cyanide can be efficiently and safely achieved by adjusting and controlling parameters such as the solution alkalinity, the solid-liquid contact time and the solid-to-liquid ratio, and the treated soil can reach the B-level standard 8mg/kg of the national Standard of Soil Quality Assessment for Exhibition Sites HJ350-2007. According to the method, the defects that in a cyanide direct oxidation method and other traditional methods, the efficiency of the treatment technology is low, and cyanide is removed not thoroughly are overcome; safe and efficient separation and removal of the cyanide are achieved; and powerful technical support is provided for comprehensive treatment and safe reutilization of a cyanide contaminated site.

The invention provides a secondary battery. The secondary battery comprises a positive electrode, a negative electrode, and an isolating membrane and electrolyte which are arranged between the positive electrode and the negative electrode; the positive electrode comprises a divalent metal ion iron cyanide complex; the secondary battery adopts the divalent metal ion iron cyanide complex as an positive electrode active material; the divalent metal ion iron cyanide complex is of a rhombohedral structure, belongs to the R-3c space group, and uses (Fe(CN)6) as a structural unit so that a three-dimensional frame network with a special pore passage structure is formed. positive ions can be rapidly embedded into and released from pore passages in a three-dimensional frame, and the three-dimensional frame is stable during embedding and releasing of the positive ions; the secondary battery adopting the divalent metal ion iron cyanide complex as the positive electrode active material has the high coulombic efficiency and the long cycle life; the divalent metal ion iron cyanide complex has the low reaction activity and the prepared battery is difficult to explode.

The invention relates to the technical field of sol-gel, and particularly relates to a preparation method and application of illumination time indicating-capable gradient-ramp crack-free gel. The method specifically comprises the following steps: improving physicochemical properties of gel by adding ionic liquid 1-butyl-3-methylimidazole tetrafluoroborate; preparing gradient-ramp crack-free gel byutilizing light decomposition properties of [Fe(CN)6]<3->; and preparing a novel crack-free sol-gel material having the time-memory function by utilizing the characteristic of color change of iron-cyanide ions under a light condition by changing iron-cyanide ion concentrations so as to indicate the span of lighting time.

The invention discloses a processing method using a cyanide-containing waste polymer as a cement plant substitution fuel, the processing method includes the following steps: (1) the cyanide-containing waste polymer is detoxified and solidified; (2) an ingredient is added, the detoxified and solidified cyanide-containing waste polymer is stirred with the ingredient; and (3) the material prepared by the step (2) is used as the cement plant substitution fuel; detoxification and solidification is use of ferrous sulfate, sulfuric acid solution and ferric chloride for reacting with cyanogens in the polymer to produce an iron cyanide complex; the ingredient is an industrial waste with the water content below 5% and pH of 7-11; the amount of the ingredient can make the water content in the material not higher than 35%, the calorific value is higher than 2000 cal/g, and the pH is 7-9 as the standard. The processing method can effectively handle high concentration cyanide-containing waste polymer (cyanide content is 300-850 mg/kg), and reduces the cement plant pulverized coal fuel use amount so as to achieve the goal of energy conservation and environmental protection.

The invention belongs to the technical field of analysis and detection, and discloses methods for determining and identifying ferrocyanide ion content and manganese content in potassium manganese ferrocyanide. The method for determining the ferrocyanide ion content in the potassium manganese ferrocyanide comprises the following steps: 1, using a spectrophotometric method to determine the content of iron cyanide radical in a mixed solution in which the potassium manganese ferrocyanide is oxidized into permanganate and iron cyanide radical salt; 2, using a spectrophotometric method to determinethe content of iron cyanide radical in a mixed solution obtained after adding an iron salt solution into the potassium manganese ferrocyanide solution to remove ferrocyanide ions; 3, calculating the ferrocyanide ion content in the potassium manganese ferrocyanide according to the data of the previous two steps. The method has the characteristics of being stable, rapid, convenient and fast, simple,and the like.

The invention belongs to the technical field of valuable metal recovery, and particularly relates to a method for separating and recovering valuable metals in cyanide-containing wastewater. The methodcomprises the following steps: adding an oxidant into cyanide-containing wastewater containing a large amount of copper and ferricyanide complex ions to carry out cyanide breaking and copper precipitation reaction to generate copper-containing precipitates, separating the copper-containing precipitates by adopting a special high-speed centrifugal separation technology, and adding a co-precipitator into a supernatant after separation to convert the ferricyanide complex ions with strong complexing property into iron-containing suspended precipitates; then combining the coprecipitation technology and the special high-speed centrifugal separation technology to achieve solid-liquid separation of ferrocyanide, and clear liquid obtained after solid-liquid separation returns to the production process or is discharged after reaching the standard after deep treatment. The invention realizes the separation of the chemical suspended matter iron ferrocyanide in the cyanide-containing wastewater containing a large amount of copper and iron cyanide complex ions, has the advantages of simple process flow, good treatment effect, high treatment efficiency and stable operation, and is especially suitable for the treatment process of the cyanide-containing wastewater.

The invention relates to an aptamer-nickel-iron cyanide nanoparticle-RGO electrode preparation method and electrochemical analysis method thereof for PCB77. The method is characterized by co-depositing nickel-iron cyanide nanoparticles with a diameter of about 5 nm onto the surface of reduced graphene oxide (RGO) in situ, modifying the obtained material on the surface of a gold electrode, and then, fixing a PCB77 aptamer to the nickel-iron cyanide nanoparticle-RGO composite material through covalent bonding reaction to obtain an aptamer-nickel-iron cyanide nanoparticle-RGO electrode. The prepared electrode is used for rapid and real-time detection of PCB77 in the environment. Compared with an existing PCB77 detection method, the method realizes high-sensitivity and high-selectivity detection of inert molecule PCB77 through combination of a high-sensitivity electrochemical analysis method and the aptamer having high specificity recognition capability; and detection limit can reach 0. 22ng/L. The method has the advantages of simple device and instrument, low analysis cost and being fast and simple and convenient and the like.

The present invention relates to a process for the purification of methylcobalamin, namely from iron cyanide impurities, comprising contacting a solution comprising methylcobalamin and iron cyanide anions with a strongly basic anion exchange resin. This purification process can advantageously be used for removing iron cyanide impurities from methylcobalamin obtained by reductive methylation of cyanocobalamin and wherein iron (II) salts are used as cyanide scavengers, thus providing methylcobalamin with a reduced iron content. Methylcobalamin (R is methyl).

The invention discloses a preparation method of a nickel-iron cyanide molecular magnet nano particle. The preparation method comprises the following steps: step one, weighing raw materials; step two, preparing a K3Fe(CN)6 water solution: adding K3Fe(CN)6 weighed in the step one into deionized water, and completely dissolving K3Fe(CN)6; step three, adding NiCl2.6H2O weighed in the step one into a PVP water solution, and stirring to completely dissolve NiCl2.6H2O; step four, under fierce stirring, slowly dropwise adding the K3Fe(CN)6 solution prepared in the step two into the mixed solution prepared in the step three, and after the K3Fe(CN)6 solution is completely added, fiercely stirring the solution for 25 to 40 minutes until the solution is converted into yellow, uniform, and stable sol so as to obtain the nickel-iron cyanide molecular magnet nano particle. The provided method can solve the problems that in the conventional method, the reactions are difficult to control and the particle size of the product is uneven.

Theinvention discloses a method for treating ferricyanic gold extraction wastewater in a gold smelting plant by using a precipitation-electrolytic oxidation synergistic effect. The method comprises the following steps: firstly, introducing the wastewater into a high-position tank or reactor with a stirring function, adding copper chloride or cuprous chloride to perform precipitation reaction, andconverting iron-cyanide ions and a part of free cyanide and zinc cyanide ions into composite precipitation; and introducing supernatant after reaction into an electrolytic cell, and performing electrolytic oxidation reaction with certain voltage by using a titanium plate or stainless steel plate as positive and negative electrodes so as to enable remaining free cyanide, zinc cyanide and copper cyanide ions in the wastewater to be oxidized to nitrogen and carbon dioxide under the synergistic effect of positive electrode oxidation and chlorine gas or hypochlorite generated in the reaction of chlorine ions, and performing electrolytic deposition on copper and zinc at the negative electrode, wherein the wastewater after treatment can return to mineral separation or leaching systems to be circularly used. Copper chloride or cuprous chloride is not only used as a precipitator, but also used as the source of an oxidizer. The method has the characteristics of being simple in treatment process,short in flow process, low in cost and good in treatment effect and has the great significance on deep treatment and comprehensive utilization of cyanide wastewater containing iron ions with high concentration.