57results about "Alkali metal iodides" patented technology

The invention discloses a method for preparing radioactive <124>I ions. The preparation method comprises the following steps: a, taking aluminium oxide powder and tellurium dioxide powder in a mass ratio of 1:18-22, uniformly mixing the powder, and pressing the obtained mixture into a tellurium target with a thickness of 50-60 mg/cm<2>; b, placing the prepared tellurium target in a circular accelerator, and irradiating the tellurium target 2-3 h by Te (p, n) <124>I, wherein the incident p particle beam intensity is 18-20 mu A, the energy is 18.5-20 MeV, and the angle of incidence is 6-10 DEG; meanwhile, cooling the tellurium target by using water in the process of irradiating, and after the irradiating is completed, placing the tellurium target to cool 4-6 h; c, placing the tellurium target in a quartz distillation tube of a destructive distillation device to distill, meanwhile, controlling the temperature to 750 DEG C so as to heat the tellurium target, so that radioactive <124>I ions are escaped, and collecting the radioactive <124>I ions. The problems that radionuclide <124>I prepared in the prior art is low in yield and low in recovery rate are solved.

A new process for recovery of Low Sodium Salt from bittern has been described in the present invention, the said process comprising desulphatation of bittern (by-product of salt industry), evaporation of bittern in solar pans and processing of solid mixture with water to produce a mixture of sodium and potassium chlorides and optionally preparing "free flowing" and iodized, by known techniques.

A method for producing halide brine wherein an alkali and a reducing agent are added to an aqueous fluid having a density greater than 8.30 lb/gal., (0.996 kg/L) water, waste water or sea water for example. The resulting fluid is then contacted with a halogen to form a halide brine. The reaction occurs in a conventional reactor such as a mixing tank.

The invention relates to a preparation method of potassium iodide. The preparation method is implemented based on the following technical scheme: (1) adding 765 parts of iodine tablets in a reaction container with a stirrer, then adding distilled water, and stirring; slowly adding 337 parts of potassium hydroxide solution with the relative density of 1.3 under the state of stirring until the reaction is complete, wherein when the solution in the reaction is puce and the pH value of the solution is 5-6, potassium iodate crystals occur in the container; and (2) slowly adding 277 parts of formic acid solution in the solution to reduce the potassium iodate, then adding potassium hydroxide for regulating the pH value to 9-10, introducing steam, carrying out heat preservation for 1-2 hours, standing, filtering to remove undissolved substances so as to obtain a silvery solution, carrying out evaporation concentration until most crystals are separated out, carrying out cooling crystallization and centrifugal separation, and drying, so as to obtain a finished product. According to the preparation method of the potassium iodide, the potassium iodide can be safely, conveniently and reliably produced, and the large-scale production is ensured to be possible, thus the preparation method can be widely applied.

A system (100) of the present invention for producing an iodine compound includes: a raw material adjusting unit (1) for supplying hydrogen-containing gas to at least one of liquid iodine in an iodine melting pot (4) and gaseous iodine obtained by evaporating liquid iodine so as to obtain a mixture gas; a hydrogen iodide producing unit (10) including a hydrogen iodide producing tower (12) having a catalyst layer (12a) for converting the introduced mixture gas into crude hydrogen iodide gas; a hydrogen iodide refining unit for removing unreacted iodine from the introduced crude hydrogen iodide gas so as to obtain hydrogen iodide gas; and an iodine compound producing unit (30) for producing a target iodine compound from the obtained hydrogen iodide gas and a reaction material. This allows producing an iodine compound with high purity easily, efficiently, and with low cost.

The invention provides a radioiodine-131 vapor trapping device which comprises a cold trap, an overflow groove, an alkaline liquor bottle, a heater, a nitrogen bottle, a refrigerating fluid storage tank, a product bottle and a vacuum pump, wherein the cold trap is respectively connected to the overflow groove, the alkaline liquor bottle, the heater, the refrigerating fluid storage tank, the product bottle and the vacuum pump by virtue of pipelines; the alkaline liquor bottle, the heater and the refrigerating fluid storage tank are respectively connected to the nitrogen bottle; and the product bottle is connected to the vacuum pump. The device disclosed by the invention can be used for effectively trapping radioiodine-131 vapor and converting the radioiodine-131 vapor into a Na131I solution which can be more than 10Ci/mL in concentration, so that the device is more conducive to the production of radioactive drugs having high specific activity. The device disclosed by the invention is compact and smart, and is convenient to operate.

The invention discloses an analytical pure potassium iodide preparation method using waste liquid containing iodine. The method comprises the steps of at first reducing all inorganic iodine of different forms in waste liquid containing iodine into iodide ions, using hydrogenperoxide as oxidant, under 80 DEG C oxidizing the iodide ions directly into iodine elements, subliming and overflowing, making sure that the iodine elements do not get oxidized further, breaking iodine clock reaction, after KOH absorbing iodine vapor, generating IO3<->, using hydrazine for reduction, making sure that no other impurity ions are introduced into potassium iodide solution, at last acquiring the analytical pure potassium iodide. The method is applicable for the treatment of waste liquid containing iodine of any forms and concentrations. The method has the advantages of being environment-friendly and economical, being simple and convenient to operate, low in cost, high in recyclability, and causing no secondary contamination during the whole process. The method can be used for the direct preparation of analytical pure potassium iodide, thus avoiding the safety problems of iodine storage and iodine vapor.

The invention discloses a method for purifying potassium iodide and its application. The method comprises the following steps: (1) taking technical grade potassium iodide, adding alcohol to soak for 0.5-2 hours; then centrifuging to take the precipitate; (2) repeating the precipitate The operations of step (1) are performed 3 to 5 times; (3) the precipitate is added to an alcohol containing potassium hydroxide and soaked for 0.5 to 1 hour; then centrifuged to take the precipitate; and the precipitate is dried to obtain purified potassium iodide. The potassium iodide purification method provided by the invention has the advantages of low energy consumption, low cost and less environmental pollution; simple operation, high yield, high efficiency, and good separation effect on sodium ions; overcoming the low yield of the existing potassium iodide purification method, and the removal of The effect of sodium is not ideal.

To provide a method for recovering an inorganic iodide, by which the inorganic iodide can be easily recovered in a high concentration from a mixed inorganic salt aqueous solution containing the inorganic iodide without necessitating specific equipment, and to obtain an objective substance at a low cost by recycling the recovered inorganic iodide in an iodine ion-removing reaction.

The invention provides a horizontal high-concentration Na<131>I production device, which comprises a dryer, a distillation device, a purifier, an iodine-131 trap, an exhaust gas purifier, a vacuum pump and a controller, wherein the dryer, the distillation device, the purifier, the iodine-131 trap, the exhaust gas purifier and the vacuum pump are sequentially connected through a pipeline; the distillation device, the purifier and the iodine-131 trap are electrically connected with the controller respectively. According to the device, iodine-131 steam distilled from activated TeO2 can be efficiently treated, and about 98 percent of iodine-131 can be recovered to obtain a medical Na<131>I solution at concentration of higher than 10Ci/mL. The device is compact, small and convenient to operate.

An object of the present invention is to provide a method for recovering iodine, which can be carried out simply and economically without practicing mixing processing operation of iodine-containing material, an alkali metal compound and a solvent in advance before introducing to a combustion furnace. The object of the present invention can be attained by a method for recovering iodine which comprises feeding an iodine-containing solution containing iodine and/or iodine compound, a basic alkali metal compound solution and/or a basic alkaline earth metal compound solution separately to a roasting furnace, oxidatively decomposing a combustible material by heat treatment, and absorbing iodine and/or iodine salt contained in a component at heat treatment exit with water or an aqueous solution.

The invention provides a self discharging vertical type Na131I production device. The self discharging vertical type Na131I production device comprises a motor I, a slide chute, a distillation furnace, an iodine gathering device and a controller, wherein the motor I is fixedly connected with the slide chute, the slide chute is connected with the distillation furnace in slide mode, the distillation furnace is connected with the iodine gathering device through a pipeline, and the controller are respectively connected with the motor I, the distillation furnace and the iodine gathering device in electrical mode. The iodine gathering device of the self discharging vertical type Na131I production device is designed in an integrated structure. The self discharging vertical type Na131I production device has an automatic distillation residue discharging function, can directly place an uncovered target cylinder in a ceramic crucible so as to achieve distillation, significantly improves a yield per unit, reduces radioactive contamination risk, solid waste output and the self size, and is compact in structure, suitable for Na131I destructive distillation production in a shield work box small in effective operation space, and good in operation stability, convenience and safety.

The invention discloses a method for recovering iodide from an isophorone cracking material, the method comprises the following steps: washing the cracking material for producing 3,5-dimethyl phenol by high-temperature cracking aromatization of isophorone with a metal salt solution, and fully converting iodide ions in the cracking material into iodide; after standing, separating 3, 5-dimethylphenol from the upper layer, and separating alkali washing water from the lower layer; concentrating the alkali washing water, crystallizing, washing and drying to obtain iodide solid; the metal salt solution is sodium carbonate, sodium bicarbonate, sodium acetate, potassium carbonate, lithium carbonate or ammonium carbonate. The whole process is simple and convenient to operate, the production process is continuously and stably operated, the risk of frequent operation of personnel is reduced, the safety is improved, the target product is obtained, the iodine element in the wastewater is recovered to a greater extent, the production cost of an enterprise is reduced, and the method is a green process.

The invention discloses a method for purifying potassium iodide from a perfluoroalkylethyl acrylate byproduct. The method comprises the following steps: washing, centrifugal filtration, and drying forobtaining the finished refined potassium iodide solid. The method for purifying potassium iodide has the advantages of simplicity in process operation, realization of the purity of the purified potassium iodide of 99%, no generation of three wastes in the whole process, safety ensuring and low energy consumption.

The invention discloses a horizontal double temperature zone I-131 destructive distillation device. The horizontal double temperature zone I-131 destructive distillation device comprises a heating furnace of a horizontal tubular furnace structure, a furnace cover, a distillation absorber, and a telescopic rack; the distillation absorber is arranged in a heating furnace chamber; the furnace cover,and the telescopic rack are arranged on a same end of the heating furnace; one end of the telescopic rack is horizontally fixedly arranged at the top center of the heating furnace, and the other end of the telescopic rack is designed to stretch downward vertically and is connected with the furnace cover on the heating furnace side through slide connection. The horizontal double temperature zone I-131 destructive distillation device is realizing rapid carrying and high efficiency capturing of high temperature molten piled TeO2 distillation high temperature I-131 steam; a low temperature zone isadopted for purifying treatment of distillation carrying gas, and it is beneficial for increasing of Na131I production efficiency and production safety.

The invention provides a preparation process for recovering iodine from industrial tail liquid, preparing polarization liquid from the recovered iodine and producing potassium iodide, wherein the preparation process sequentially comprises the following seven steps: pretreating and classifying iodine-containing wastewater to be extracted, reacting to generate solid iodine, centrifugally dewatering, extracting iodine by steam and recycling, absorbing iodine gas, and preparing the potassium iodide and the polarization liquid. According to the preparation process, the solid iodine can be recovered from iodine-containing wastewater or concentrated iodine liquid in the industrial tail liquid according to the preparation process, the solid iodine can be purified into the electronic-grade iodine, the electronic-grade iodine can be further made into the polarization liquid, and meanwhile, the tail liquid can directly enter a wastewater plant to achieve the emission standard.

The invention belongs to the technical field of chemical reagent synthesis and relates to a method for preparing potassium iodide by using a micro-channel reactor. Specifically, the method comprises the following steps of (1) preparing a solution A by using hydroiodic acid and formic acid; (2) preparing a solution B by using potassium hydroxide and water; (3) reacting the two solutions in the micro-channel reactor; and (4) carrying out after-treatment. The method is mild in reaction condition, the high-quality potassium iodide can be efficiently and quantitatively prepared, and no waste gas or wastewater is generated in the whole preparation process; the disadvantages that a traditional technology is unsafe, toxic and multiple in three wastes in after-treatment are overcome; the potassium iodide prepared through the method is safe and reliable; various detection results can meet the requirements of related standards; the application field of a product is expanded; the preparation method is simple and feasible; and the possibility is provided for massive production.

The invention relates to a method for recycling fluorine-containing and iodine-containing waste resources. The method comprises the following steps: converting organic fluorine into potassium fluorideby using potassium hydroxide, and performing aerobic incineration at a temperature of 600-800 DEG C by using a converter to completely burn out or carbonize organic matters without generating fluorine-containing toxic substances such as hydrofluoric acid, perfluoroisobutylene and the like; removing fluorine ions by using calcium hydroxide, removing excessive calcium hydroxide by using potassium carbonate, adjusting the pH value by using formic acid, and converting potassium formate into potassium iodide by using iodine. Therefore, elemental iodine does not need to be recovered to reproduce potassium iodide, the cost is saved, and the utilization rate of iodine is increased. According to the potassium iodide finished product, the content of potassium iodide is 99% or above, and fluorine ions are smaller than 1 ppm.

The invention provides a vertical type Na131I dry distillation production device which comprises a motor, a sliding chute, a distillation furnace, an iodine catcher and a controller, wherein the motor is fixedly connected with the sliding chute; the sliding chute is slidably connected with the distillation furnace; the distillation furnace is connected with the iodine catcher through a pipeline; and the controller is electrically connected with the motor, the distillation furnace and the iodine catcher respectively. The vertical type Na131I dry distillation production device provided by the invention can be used for producing the medical-grade Na131I from activated TeO2, and can be used for directly placing an uncapped target barrel into a ceramic crucible for distillation, thus obviously enhancing the unit yield of the device and the utilization rate of a raw material and reducing the risk of radioactive pollution and the output of a radioactive solid waste. The vertical type Na131I dry distillation production device provided by the invention is compact in structure, can be suitable for Na131I dry distillation production inside a shielding work box with a small effective operation space and has good stability, convenience and safety in operation.

The invention discloses a universal raw material dewatering and purifying method and device, which are used for solving the problem of water pollution ubiquitous in high-purity raw materials in the existing crystal industry. The method comprises the following steps: taking a high-purity 4N-6N metal or halogen compound as a to-be-purified raw material, and putting the to-be-purified raw material atthe upper part of a crucible structure connected by a capillary tube provided by the invention; transferring and fixing the crucible structure into a gas circuit and a furnace body; introducing a protective atmosphere, and heating the furnace body to melt the to-be-treated raw material; introducing halogen or silane compound reactive gas into the melt to make H2O in the melt fully react with thereactive gas to generate inert substances and tail gas, and enabling the inert substances and the tail gas to be discharged along with the protective atmosphere; and after the reaction is finished, adjusting the flow rate of the gas to extrude the melt into a lower crucible and sealing the tube. As H2O in the to-be-treated raw material fully reacts with the reactive gas in a high-temperature meltstate, the content of H2O in the raw material is reduced by 1-2 orders of magnitudes, the wetting effect of a crucible and a crystal can be effectively reduced, and the photoelectric property of a corresponding crystal is remarkably improved.