18results about "Ammonium halides" patented technology

The application discloses a method and system for preparing ammonium bifluoride from hydrofluoric acid waste liquid, which comprises the following steps: (1) adding the hydrofluoric acid waste liquid into an electrolytic cell, transporting the electrolytic cell to a first reaction kettle after electrodepositing treatment, adding silicon dioxide, then stirring and reacting, and returning the generated silicon tetrafluoride and hydrofluoric acid into a spray tower to react and then return to the first reaction kettle, and then adding ammonia water to perform neutralization reaction; (2) filtering the solid-liquid mixture I, evaporating and drying the obtained filtrate I to obtain an ammonium nitrate product, and returning the obtained filter cake I to a second reaction kettle, adding ammonia water to adjust the pH value, and then stirring and reacting; (3) filtering the solid-liquid mixture II, returning the obtained filter cake II to the first reaction kettle for reuse, transporting the obtained filtrate II to a reactor, adding hydrofluoric acid to perform reaction, and then performing evaporation and drying treatment to obtain an ammonium bifluoride product. The method is simple in process, low in energy consumption, convenient to operate and convenient for industrialized production and application.

This invention belongs to the field of ammonium bifluoride purification technology, and specifically relates to a multi-stage filtration mechanism for ammonium bifluoride purification. The mechanism includes a tank with protective components on its outer surface, a discharge port at the bottom, a feed port on one side of the top, a motor in the center of the top, a rotating shaft at the motor's output end, a centrifugal drum at the bottom of the shaft, a flow guide platform below the centrifugal drum, and a bag filter at the bottom of the flow guide platform. This invention, through the cooperation of the motor, centrifugal drum, flow guide platform, bag filter, and activated carbon adsorption plate, enables the filtration mechanism to perform multi-stage filtration, avoiding the problem of poor impurity separation when filtration and purification of ammonium bifluoride in the liquid phase. Furthermore, the cooperation of the protective frame, rubber damping plate, rotating rod, and pressure relief cylinder prevents the surface of the device from easily denting or cracking after external impact.

The application discloses a method for recovering fluorine and triethylamine from fluorine-containing organic wastewater, and belongs to the technical field of fluoride preparation. The method adopts the synergistic effect of an organic phase of an extractant A and an extractant B under the condition that the pH is 0.5-4, realizes selective extraction of fluorine ions and inhibition of extraction of metal impurity cations under the premise that water-soluble triethylamine is not extracted through a one-step liquid-liquid extraction process, thereby realizing efficient and low-loss recovery of fluorine and triethylamine, and further preparing high-purity fluorides and triethylamine. The method has the advantages of short process, no need of complicated impurity removal process, high fluorine recovery rate, low production cost and the like.

The invention provides an ion exchange system and an ion exchange method. The ion exchange system comprises a feeding system, an ion exchange system and a separation system, the ion exchange method comprises the following steps: firstly, feeding through the feeding system, then carrying out ion exchange treatment on the molecular sieve by utilizing the ion exchange system, and completing multiple ion exchange operations under the cooperation of the separation system and the feeding system. The system can efficiently and quickly complete sodium type silicon aluminum molecular sieve ammonium ion exchange, and has the characteristics of wide application range of molecular sieve types, stable product quality, recoverable ammonium solution and the like.

The application discloses modified sodium iron pyrophosphate phosphate, a preparation method, application, slurry, an electrode piece and a battery. The preparation method of the modified sodium iron pyrophosphate phosphate comprises the following steps: performing gas phase deposition of powder on an Al2O3 nano layer oriented growth (010) crystal face to obtain the modified sodium iron pyrophosphate phosphate; and the powder is manganese and titanium doped sodium iron pyrophosphate phosphate powder containing a fluorinated layer on the surface. Through the triple synergy of Mn / Ti double site doping, crystal face selective Al2O3 coating and gas phase fluorination, the effects of improving electronic conductivity, inhibiting electrolyte interface side reactions and improving the low-temperature performance of the battery are achieved.

The application provides a resourceful treatment method of sodium chloride waste salt, and belongs to the field of sodium chloride waste salt treatment. The method comprises the following steps: preparing a first saturated sodium chloride solution by using sodium chloride waste salt; introducing ammonia into the saturated sodium chloride solution to obtain a saturated ammonia salt aqueous solution; introducing carbon dioxide into the saturated ammonia salt aqueous solution to obtain a first mixed slurry; performing solid-liquid separation on the first mixed slurry to obtain a NaHCO3 product and a first filtrate; adding sodium chloride waste salt into the first filtrate to obtain a second saturated sodium chloride solution; introducing ammonia into the second saturated sodium chloride solution to obtain a saturated mixed solution; performing cooling crystallization on the saturated mixed solution to obtain a second mixed slurry; performing solid-liquid separation on the second mixed slurry to obtain an NH4Cl product and a second filtrate; and recycling the second filtrate to prepare the first saturated sodium chloride solution to form a closed cycle. Thus, a new resourceful treatment method of sodium chloride waste salt is provided.

This invention relates to the field of wastewater treatment technology, specifically to a method for zero-discharge treatment of ammonia-containing wastewater. The specific steps of this invention are as follows: Two-stage ceramic filtration: removing particulate impurities; Multi-media filtration: removing suspended impurities and colloidal substances from the wastewater; Macroporous resin adsorption: adsorbing ammonia from the wastewater; the saturated resin tank is desorbed with methanol, which is recycled, and the concentrate is sold as tar; Ammonia stripping section: distilling off ammonia from the wastewater, the resulting concentrated ammonia water is used as a desulfurization alkali source, ammonia is recovered and reused, and the ammonia stripping wastewater enters the concentration section; Ammonia stripping concentration: the condensate after condensation is used as industrial fresh water, recrystallized and separated, and dried to obtain the product ammonium chloride; Clarified liquid treatment: the clear liquid on top of the cooled concentrate is periodically discharged into an ammonium sulfate mother liquor tank to produce ammonium sulfate. This method separates residual ammonia water, organic matter, ammonia water, and ammonium salts in a stepwise manner. No alkali is added during ammonia stripping, and the resulting organic matter (tar), ammonia water, and ammonium salts can all be sold as products.

A uranium tetrafluoride preparation system based on a reducing hydrofluorination reaction includes a gas supply mechanism, a three-stage fluidized bed mechanism, and a tail gas treatment mechanism. The gas supply mechanism includes an ammonium fluoride heating tank and a gas separation tank. The gas separation tank has a mixed gas inlet, an ammonia outlet A, and a hydrogen fluoride outlet at its top. The mixed gas inlet of the gas separation tank is connected to the mixed gas outlet of the ammonium fluoride heating tank. The three-stage fluidized bed mechanism includes a fluidized bed A, an intermediate container X, a fluidized bed B, an intermediate container Y, and a fluidized bed C. The tail gas treatment mechanism includes a condenser, a crystallization tank, a plate filter, a microwave dryer, and a scrubbing tower. This invention uses a three-stage fluidized bed system to reduce and hydrofluorinate uranium oxide to prepare uranium tetrafluoride. Compared with the existing "uranium purification-uranium conversion" process, it enables continuous production control and significantly shortens the process flow.

This invention discloses a process for producing agricultural-grade potassium sulfate, desulfurized sodium bicarbonate, and agricultural-grade ammonium chloride, relating to the fields of coal chemical industry and coal mine solid waste treatment technology. The invention includes the following steps: Step 1, raw material processing; Step 2, brine preparation and refining; Step 3, membrane separation concentration; Step 4, evaporation concentration; Step 5, flash evaporation purification of heptahydrate nitrate; Step 6, preparation of agricultural-grade potassium sulfate; Step 7, preparation of desulfurized sodium bicarbonate and agricultural-grade ammonium chloride. The production process of this invention has extremely low energy consumption. Evaporation adopts a four-effect, five-body + MVR evaporation process, utilizing the energy-saving characteristics of multi-effect evaporation and improving efficiency with MVR heat pumps, eliminating the need for a fiberglass cooling tower system, and fully utilizing waste heat. Addressing the tendency of ammonium chloride to clump and stick to the walls during drying, a new type of energy-saving dry ammonium furnace is used, resulting in significant energy savings and a long equipment operating cycle. The two-stage reaction process for producing potassium sulfate from a supersaturated sodium sulfate solution improves reaction efficiency and virtually eliminates byproduct production.

The present application belongs to the technical field of sewage treatment, and particularly relates to a resource treatment process for high-fluorine and high-ammonia-nitrogen wastewater, which specifically comprises: (1) adjusting the pH value of the wastewater to 10.5 or above; (2) performing stripping treatment on the adjusted wastewater to obtain ammonia-containing gas and stripped wastewater, and absorbing the ammonia-containing gas to obtain recovered ammonia water; (3) making the stripped wastewater pass through an ammonia-nitrogen adsorption material for deep denitrification to obtain denitrified wastewater; and (4) making the denitrified wastewater pass through a fluorine adsorption material for defluorination treatment; wherein, when the fluorine adsorption material reaches adsorption saturation in step (4), the recovered ammonia water obtained in step (2) is used as a regenerant to regenerate the fluorine adsorption material, and ammonium fluoride by-product is obtained. Through process design, the present application realizes full-resource utilization of ammonia nitrogen and fluorine in the wastewater, expands the material utilization range from internal recycling in the recovery link to cross-link recycling between production and recovery, and forms a resource closed loop in the industry.

This invention belongs to the field of methoxyamine hydrochloride preparation technology and discloses a method for separating methoxyamine hydrochloride and ammonium chloride. The method involves cooling a mixed solution containing ammonium chloride and methoxyamine hydrochloride to selectively crystallize out ammonium chloride, which is then separated to obtain ammonium chloride crystals and a mother liquor enriched with methoxyamine hydrochloride. The mother liquor is then concentrated or dissolved by heating, followed by ultra-low temperature crystallization, separation, and drying to obtain methoxyamine hydrochloride crystals. This invention uses ultra-low temperature segmented crystallization to selectively precipitate ammonium chloride, resulting in methoxyamine hydrochloride crystals with a purity ≥99.9% and ammonium chloride crystals with a purity ≥98%.

Systems and methods for in situ production of ammonia and / or ammonium salt compounds using subsurface geochemistry are provided. In some embodiments, one or more reactants can be delivered to a subsurface region for in situ formation of ammonia and / or ammonium salts. The reactants can be reacted with an ultramafic rock bed to form hydrogen gas (H2). The hydrogen gas can then be reacted with a nitrogen source to form ammonia that can be collected. In another embodiment, nitrogen gas can be pumped into contact with hydrogen gas released from the rock bed to form ammonium salts in the earth's crust that can be mined. In some other embodiments, a catalyst can be delivered with the reactants or the reaction can be facilitated by a catalyst in the rock bed to form ammonia gas in situ without the need for hydrogen gas formation.

The invention discloses a method for co-producing high-dispersion white carbon black and electronic-grade fluoride salt by using fluorine-containing silicon slag, which comprises a leaching conversion unit, a solid-liquid separation unit, a modified crystallization reaction unit, a secondary separation and washing unit, a drying and collecting unit and a mother liquor regeneration unit, the method has the advantages that the solid silicon slag is converted into the liquid ammonium fluosilicate solution through the leaching conversion unit, insoluble metal impurities such as iron, calcium and magnesium are thoroughly intercepted and separated by utilizing a solid-liquid phase state conversion mechanism and matching with the solid-liquid separation unit, the problems that the regenerated white carbon black is high in iron content and yellow in color are solved from the source, and the method is suitable for industrial production. The purity of the prepared product silicon dioxide can reach 99.5% or above; a process of combining in-situ modification and gradient ammonolysis is adopted, a dispersing agent is introduced in the initial stage of silicon dioxide crystal nucleus formation to construct a soft template, and hard agglomeration of primary particles is effectively blocked in cooperation with precise pH gradient control; the modified crystallization reaction adopts a three-section pH control method, so that the crystal quality is greatly improved.

The application provides a method and system for resourceful treatment of high-salinity gas field water. The method comprises a pretreatment section, a mother liquor generation section, a sodium bicarbonate generation section, an ammonium chloride generation section, an ammonium sulfate generation section, and an ammonium sulfate decomposition section. The method of the application introduces ammonia gas into the generated mother liquor to saturate the amount of dissolved ammonia gas in the mother liquor; and continues to introduce carbon dioxide into the mother liquor to precipitate sodium bicarbonate solids from the mother liquor and filter to obtain sodium bicarbonate. The method of the application also includes cooling the mother liquor from which the sodium bicarbonate solids have been removed to below 10°C to precipitate ammonium chloride solids and filter to obtain ammonium chloride; and introducing sulfuric acid hydrogen ammonia to react with the ammonium chloride generated in the ammonium chloride generation section to generate ammonium sulfate and hydrogen chloride; and decomposing the ammonium sulfate to generate ammonia gas and sulfuric acid hydrogen ammonia. The method and system of the application achieve high-value utilization of waste resources.

The invention discloses a method for co-producing high-purity sodium fluoride and ammonium chloride through fluorosilicic acid ammonolysis, and belongs to the technical field of fluorine chemical industry. Firstly, fluosilicic acid reacts with ammonia water to prepare an ammonium fluoride solution; secondly, sodium chloride and a sodium pyrophosphate inhibitor are added into the solution, and sodium fluoride coarse crystals and first mother liquor are obtained through programmed temperature control crystallization; then, carrying out two-stage negative pressure gradient concentration on the first mother liquor, deeply recovering sodium fluoride and crystallizing ammonium chloride; then, carrying out gradient purification on the sodium fluoride coarse crystal by absolute ethyl alcohol to obtain a high-purity product; finally, the ammonium chloride wet material is granulated into a superior chemical fertilizer through a fluidized bed, through the innovative crystallization and purification technology, the total yield of sodium fluoride is stabilized at 96.5% or above, the product purity breaks through 99.8%, meanwhile, high-value utilization of the by-product ammonium chloride is achieved, and economic and environment-friendly benefits are remarkable.

The application provides a resource utilization treatment system and method for continuously preparing ammonium base from sodium chloride waste salt, and belongs to the field of resource utilization of sodium chloride waste salt. The system comprises: a first gas-lift loop reactor, a liquid inlet of the first gas-lift loop reactor being connected to a saturated sodium chloride waste salt solution, and a gas inlet of the first gas-lift loop reactor being connected to ammonia gas; a micro-reactor, a liquid inlet of the micro-reactor being connected to a liquid outlet of the first gas-lift loop reactor, and a gas inlet of the micro-reactor being connected to carbon dioxide; a first filter, an inlet of the first filter being connected to an outlet of the micro-reactor; a second gas-lift loop reactor, a liquid inlet of the second gas-lift loop reactor being connected to a liquid outlet of the first filter, and a gas inlet of the second gas-lift loop reactor being connected to ammonia gas; and a cooling crystallizer, a liquid inlet of the cooling crystallizer being connected to a liquid outlet of the second gas-lift loop reactor. Therefore, the resource utilization rate of sodium chloride waste salt is improved.

The invention relates to the technical field of industrial wastewater treatment, in particular to a cobaltosic oxide waste liquor and mother liquor resourceful treatment method and system, and the method comprises the following steps: sequentially carrying out advanced oxidation, carbonate radical removal, coagulating sedimentation, ceramic membrane filtration, nanofiltration salt separation, concentration reduction and evaporative crystallization treatment on mother liquor, the method comprises the following steps: sequentially carrying out ceramic membrane filtration and reverse osmosis concentration treatment on washing water, merging washing water and reverse osmosis concentrated water into a mother liquor nanofiltration salt separation process, synchronously collecting multi-dimensional data of a nanofiltration membrane assembly, constructing an impurity accumulation index, a salt separation purity index and a membrane pollution index, and judging the running state of a nanofiltration and evaporation system in real time. And predicting the residual healthy operation time and the residual impurity removal time of the nanofiltration membrane, and executing a hierarchical regulation strategy and dynamic adjustment of an impurity removal threshold value. Cooperative treatment and intelligent closed-loop regulation and control of waste liquid and washing water are achieved, and the water resource and ammonium salt recovery rate is maximized while the purity of an ammonium chloride product is guaranteed.