13results about "Thiocyanic acid" patented technology

The application provides a method for preparing calcium thiocyanate by using desulfurization waste liquid, calcium nitrate and ammonium thiocyanate are respectively dissolved into 30-50% solution, the calcium nitrate solution is slowly dropped into the hot ammonium thiocyanate solution under the conditions of heating and stirring, under the heating state, the double decomposition reaction occurs to generate calcium thiocyanate and ammonium nitrate, with the continuous heating and the evaporation of water, the concentration of calcium thiocyanate gradually increases, the ammonium nitrate is heated and decomposed to generate nitrogen oxide and ammonia gas, the generated process gas rich in nitrogen oxide and ammonia gas is condensed and introduced into the coking ammonia removal and denitration section for treatment, and finally the evaporation and concentration obtain about 50% calcium thiocyanate product. The method uses industrial waste to provide raw materials, and the production cost is low; the process tail gas generated in the reaction only needs to be treated by the existing ammonia removal and denitration device of the coking enterprise, without increasing additional equipment, thereby saving the expenditure; and the method has environmental protection benefit, social benefit and economic benefit.

The invention relates to the technical field of salt extraction and recovery of sodium-process desulfurization waste liquid, in particular to a method and device for extracting product-grade sodium thiocyanate from sodium-process desulfurization waste liquid, and the method comprises the following steps: step a, primary decoloring treatment, step b, primary concentration crystallization, step c, secondary decoloring treatment, step d, freezing crystallization, step e, precise desalting, and step f, secondary concentration crystallization. A stepped process design of two-time decoloration, fractional crystallization and precise desalination is adopted, aiming at the physicochemical property difference of three core salts of sodium sulfate, sodium thiosulfate and sodium thiocyanate in the sodium-process desulfurization waste liquid, efficient separation is realized by accurately controlling process parameters, the sodium sulfate is preferentially separated out by utilizing the characteristic that the solubility of the sodium sulfate is relatively low at high temperature, and the sodium thiosulfate is separated out by utilizing a high-temperature crystallization method. The sodium thiocyanate is separated out in a targeted manner on the premise of ensuring that the sodium thiocyanate is in an unsaturated state, so that the technical problem that the sodium thiocyanate is easy to co-crystallize at low temperature is solved.

The invention discloses a synthesis method of a C-13 labeled mercapto triazole derivative. The synthesis method comprises the following steps: (1) carrying out a reaction on C-13 potassium cyanide and S8 to prepare C-13 potassium thiocyanate; (2) carrying out nucleophilic substitution reaction on C-13 potassium thiocyanate and a benzyl bromide compound to obtain a compound 1; (3) carrying out nucleophilic addition reaction on the compound 1 and formylhydrazine to obtain a compound 2; (4) further cyclizing the compound 2 under an alkaline condition to obtain a compound 3; and (5) carrying out derivative reaction on the compound 3 to obtain a C-13 labeled target compound. According to the synthesis method, multi-step continuous reaction is adopted, operation is easy and convenient, the yield is high, and the utilization rate of the C-13 marker is greatly increased.

The utility model belongs to the field of industrial waste liquid treatment and recovery, disclose is a kind of coking desulfurization waste liquid salt extraction system, including pretreatment system and first salt extraction system;The pretreatment system includes first reaction kettle and first filter device, the first reaction kettle with the first filter device is connected, for the impurity removal and filtration of coking desulfurization waste liquid;The first salt extraction system includes crystallization reactor and second filter device, the crystallization reactor includes feed inlet, liquid discharge port and solid discharge port, the feed inlet is used to put in the coking desulfurization waste liquid after impurity removal and copper sulfate solution, the solid discharge port with the second filter device is connected, and the second filter device is used to filter out cuprous thiocyanate. Cuprous thiocyanate reaction precipitation can be realized to filtration treatment, and the processing efficiency is improved.

The invention discloses a method for preparing cuprous thiocyanate by using copper fire refining slag, and relates to the technical field of copper fire refining. According to the method, the copper pyrogenic process refining slag meeting the specific content composition is subjected to chlorination leaching, the refining slag is leached through hydrochloric acid system chlorine salt to obtain the leachate containing the cuprous, then thiocyanate is added for a reaction, and the product cuprous thiocyanate can be obtained. The synthetic route provided by the invention is low in cost and high in product rate, the leaching slag can be returned to prepare nickel matte, and high-value utilization of the copper refining slag is realized.

The application provides a desulfurization waste liquid treatment method, and belongs to the technical field of waste water treatment. The desulfurization waste liquid is subjected to step-by-step salt extraction to obtain ammonium thiosulfate, ammonium thiocyanate and ammonium sulfate; the ammonium thiosulfate is purified by using ethanol to obtain pure ammonium thiosulfate; the ammonium thiocyanate is purified by using ethyl acetate-acetone and ethyl acetate step by step to obtain pure ammonium thiocyanate; and the ammonium sulfate is purified by using a water-acetone mixed solution to obtain pure ammonium sulfate. The application first subjects ammonium thiosulfate, ammonium thiocyanate and ammonium sulfate in the desulfurization waste liquid to rough extraction by using step-by-step salt extraction, and then subjects the ammonium thiosulfate, ammonium thiocyanate and ammonium sulfate to purification by using specific solvents, so that pure ammonium thiosulfate, pure ammonium thiocyanate and pure ammonium sulfate with high purity are obtained, and the added value of the products is effectively improved.

The present application relates to the technical field of chemical wastewater recycling treatment, and discloses a method and device for extracting ammonium thiocyanate. The method comprises the following steps: performing primary solid-liquid separation on a mixed solution of pretreated high-purity vanadium wastewater and coal gas desulfurization waste salt to precipitate anhydrous sodium sulfate; performing secondary solid-liquid separation on the solution after the primary solid-liquid separation to precipitate a mixed salt of sodium sulfate and ammonium sulfate; and performing tertiary solid-liquid separation on the solution after the secondary solid-liquid separation to obtain ammonium thiocyanate. The method can solve the problems of efficient treatment of high-purity vanadium wastewater and difficulty in treatment or resource utilization of coke oven gas desulfurization waste residue, so as to achieve waste treatment with waste and resource recycling, and greatly reduce the treatment investment cost and operation cost of the two pollutants.

The invention relates to a sulfur foam liquid salt extraction and acid making coupling process, which comprises the following steps: carrying out solid-liquid separation on sulfur foam liquid to obtain a first solid material and a first liquid material, decoloring the first liquid material, and concentrating to obtain a slurry material and a second liquid material; the first solid material and the slurry material are incinerated, and first synthesis gas is obtained and used for preparing concentrated sulfuric acid; and cooling the second liquid material, and centrifuging to obtain ammonium thiocyanate. The sulfur foam liquid is subjected to solid-liquid separation, so that the waste liquid amount is reduced, the equipment volume in the salt extraction area is reduced, and the cost is reduced. An oxidation process in the salt extraction area is canceled, ammonium thiosulfate is subjected to high-temperature concentration and then is subjected to centrifugal separation to obtain crystals, the crystals and the separated ammonium sulfate are sent to the acid making area to be incinerated, and generated tail gas is sent to a desulfurization and denitrification section of a coking plant to be treated, so that emission without solid waste is realized, and maximum utilization of sulfur element and ammonium thiocyanate in sulfur foam liquid is realized.

The invention belongs to the technical field of sodium thiocyanate extraction, and particularly relates to a process for extracting sodium thiocyanate from coking desulfurization and decyanation waste liquid, which comprises the following steps: S1, carrying out catalytic oxidation on desulfurization waste liquid, adding dilute sulphuric acid, and adding a proper amount of liquid caustic soda to adjust the pH value to weak acidity to obtain a material; s2, centrifugally separating out sulfur solids from the materials, enabling the sulfur solids to fall into a sulfur pulping kettle, pumping the sulfur solids into a coking sulfur foam head tank through a pump, enabling the sulfur solids to enter a sulfur melting kettle to obtain sulfur, and obtaining activated carbon from residual slurry; s3, preparing a product sodium sulfate and / or a product sodium thiocyanate; wherein water in the slurry treated in the step S2 is evaporated until the content of sodium thiocyanate is 48-55%, solid sodium sulfate is obtained through centrifugation, and the product sodium sulfate is obtained through drying; and / or decolorizing the centrifuged liquid with activated carbon, filtering to separate out the activated carbon, evaporating water from the liquid until the content of sodium thiocyanate is 72-80%, crystallizing to separate out sodium thiocyanate, and centrifugally separating and drying to obtain the product sodium thiocyanate.

The invention discloses a preparation method of cuprous oxide, cuprous salt and a preparation method thereof, the preparation method of cuprous oxide comprises the following steps: alkali is added into an arsenic-containing copper solution for reaction, cuprous oxide is obtained after solid-liquid separation, the arsenic-containing copper solution meets the condition that 2cAs < 3 + > is greater than cCu < 2 + >, cAs < 3 + > is the molar concentration of trivalent arsenic in the arsenic-containing copper solution, and the cuprous salt is the molar concentration of trivalent arsenic in the arsenic-containing copper solution. CCu < 2 + > is the molar concentration of bivalent copper in the arsenic-containing copper solution. An alkaline reagent is added into an arsenic-containing copper solution with specific arsenic and copper contents to react to prepare a cuprous oxide raw material, and the cuprous oxide raw material is further converted into cuprous salt, so that not only can effective separation of arsenic and copper be realized, but also a high-purity cuprous salt product can be obtained. The method is simple in technological process and easy and convenient to operate and has good implementability and industrial application prospects, and the obtained cuprous salt product is excellent in quality and has high application value.

This invention discloses a method for desulfurization and decyanation of coke oven gas using synergistic unary and binary catalytic desulfurization. The method includes the following steps: dividing the coke oven gas desulfurization system into one unary catalytic desulfurization unit and multiple binary catalytic desulfurization units, with each unit performing catalytic desulfurization in parallel and synergistically; the unary catalytic desulfurization unit processes 25-30% of the total gas volume, and the combined binary catalytic desulfurization units process 70-75% of the total gas volume. The unary catalytic desulfurization unit uses a phthalocyanine cobalt sulfonate compound desulfurizing agent as a single catalytic system; each binary catalytic desulfurization unit uses a complexed iron catalyst; the unary catalytic filtrate containing PDS catalyst produced by the unary catalytic desulfurization unit is sent to each binary catalytic desulfurization unit for secondary utilization; the coke oven gas after unary and binary synergistic catalytic desulfurization contains H2S < 50 mg / Nm³. 3 The desulfurization process of this invention requires a low alkalinity, which can effectively reduce alkali source consumption and side reactions, resulting in stable desulfurization performance, low waste liquid volume, and no clogging of the desulfurization tower packing.

The present application relates to wastewater treatment material technical field, specifically to a kind of nanometer cuprous thiocyanate, preparation method and application;The preparation method includes the following steps: S1, copper sulfate is stirred and dissolved in water and stirred uniformly, and blue transparent solution is obtained;S2, slowly drop sodium thiosulfate solution into blue transparent solution, and green transparent solution is obtained;S3, slowly drop sodium thiocyanate solution into green transparent solution and react to obtain white precipitate;S4, filter and collect white precipitate and repeatedly clean with anhydrous ethanol and distilled water to remove sodium thiocyanate impurities on the surface of white precipitate, then dry, grind to obtain nanometer cuprous thiocyanate.The application of nanometer cuprous thiocyanate prepared by the present application to adsorb tetracycline antibiotics in wastewater has the advantages of strong stability compared with copper sulfide, not easy to be oxidized by air, and can be recycled multiple times, so that resources are maximized.

This invention provides a method for separating and purifying coking desulfurization wastewater, comprising the following steps: oxidizing the coking desulfurization wastewater to obtain an oxidized liquid, the oxidized liquid comprising ammonium thiocyanate and ammonium sulfate; concentrating the oxidized liquid by a first evaporation at a first temperature, followed by solid-liquid separation to obtain a first separated liquid; concentrating the first separated liquid by a second evaporation at a second temperature, followed by solid-liquid separation to obtain a second separated liquid and a mixed salt, the mixed salt comprising ammonium sulfate and ammonium thiocyanate; diluting the concentration of ammonium thiocyanate in the second separated liquid to 50-70%, and crystallizing and separating the solid and liquid at a third temperature to obtain a mother liquor and ammonium thiocyanate; the third temperature being 10-40℃; wherein 5℃ ≤ the first temperature difference T1 between the first and second temperatures ≤ 20℃, and 40℃ ≤ the second temperature difference T2 between the second and third temperatures ≤ 70℃. This invention can significantly improve the purity of ammonium thiocyanate and ammonium sulfate products, and the method is highly feasible.