77results about "Ammonium halides" patented technology

The utility model relates to the technical field of anhydrous ammonium hydrogen fluoride preparation, and discloses a micro-channel reaction device for preparing anhydrous ammonium hydrogen fluoride, which comprises a raw material tank, a vaporizer, a micro-channel reactor and a shell-and-tube heat exchanger, two driving motors are mounted at the upper end of the micro-channel reactor, stirring rods are mounted at the lower ends of the driving motors through motor shafts, a plurality of stirring blades are arranged on the stirring rods, a micro-channel groove is formed in the middle in the micro-channel reactor, a plurality of channels are uniformly distributed in the micro-channel groove, and two catalysts are mounted at the bottom end in the micro-channel reactor. Two driving motors are started, the driving motors drive stirring rods to rotate through motor shafts, the flow speed of ammonium bifluoride gas is increased, multiple channels are formed in the micro-channel groove, the contact area and the retention time of reaction gas can be increased through the channels, the reaction efficiency is improved, the reaction gas reacts with other reactants under the action of a catalyst, and the reaction efficiency is improved. Anhydrous ammonium bifluoride and other byproducts are generated, so that the reaction is sufficient.

The invention relates to the technical field of solid waste recycling, and particularly provides a circulating fluidized bed system for gasification fly ash resourceful treatment and an aluminum oxide leaching method. The system comprises a hearth, a gas-solid heat exchange bed and an activation reactor. The gasified fly ash and a water glass binder are agglomerated and thickened through a fine powder agglomerator, incineration is conducted through a hearth, and ammonia gas is injected to fix heavy metal; the ash enters an activation reactor, a mullite structure is destroyed by utilizing residual carbon oxygen-enriched combustion (850-950 DEG C) of fly ash, aluminum ions are extracted through gradient acid leaching, acid leaching liquid is neutralized by ammonia water to precipitate aluminum hydroxide, and high-purity aluminum oxide (greater than 99%) and a byproduct ammonium chloride fertilizer are obtained through calcination; the escape rate of fine particles is lower than 10%, the leaching rate of aluminum oxide exceeds 85%, and the treatment cost is reduced by 50% or above compared with that of a traditional method.

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 neodymium-iron-boron secondary waste recycling method, which comprises the following steps: step 1, reacting neodymium-iron-boron secondary waste with acid solution, controlling the pH of the solution after reaction to be 0.5-1.5, and performing solid-liquid separation to obtain filter liquor A containing Fe 3+ and filter residue A; step 2, reducing Fe 3+ in the filter liquor A into Fe 2+ , performing solid-liquid separation to obtain filter liquor B and filter residue B; step 3, adjusting the pH of the filter liquor B to 2-6, performing solid-liquid separation to obtain filter liquor C and filter residue C; and step 4, reacting the filter liquor C with a precipitant, performing solid-liquid separation to obtain filter residue D and filter liquor D. The present application realizes short-process comprehensive utilization of oxalic acid, hydrochloric acid and iron resources, is friendly to the operation environment, does not need strong-acid and strong-alkali equipment, and can simultaneously realize green and efficient comprehensive utilization of iron-containing waste residue and oxalic acid wastewater.

The application discloses a recycling method of NF3 electrolysis residual solution and relates to the technical field of electrolysis residual solution recycling treatment. The method comprises the following steps: step 1: removing Fe ions in the electrolysis residual solution; first, hydrogen peroxide or oxygen is added into the electrolysis residual solution to oxidize the divalent iron ions into trivalent iron ions, and then ammonia water and sodium hydroxide or ammonium hydrogen carbonate and sodium hydroxide are added into the solution to react, so that the trivalent iron ions are precipitated in the form of iron hydroxide; step 2: the electrolyte solution after the removal of iron is adjusted to a pH of 3-12 by adding hydrofluoric acid, enters an extraction system, extracts the nickel element in the ammonium hydrogen fluoride, and purifies the ammonium hydrogen fluoride; and step 3: the nickel element separated from the electrolyte solution enters a second extraction to synthesize a nickel sulfate product.

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 utility model provides a glycine crystallization regulation and control device, which relates to the technical field of glycine preparation and comprises a raw material tank filled with ammonification reaction liquid; the alcohol precipitation crystallization kettle is connected with the raw material tank; the first feeding pipe and the second feeding pipe are both connected with the alcohol precipitation crystallization kettle, and a pipeline flowmeter is arranged in the first feeding pipe; the radar liquid level meter is arranged on the alcohol precipitation crystallization kettle; the pH meter is used for monitoring the pH value of the material in the alcohol precipitation crystallization kettle; the pipeline flow meter, the radar liquid level meter and the pH meter are connected with the control system in a wired or wireless mode; wherein the first feeding pipe is used for adding methanol into the alcohol precipitation crystallization kettle, and the second feeding pipe is used for adding hydrochloric acid into the alcohol precipitation crystallization kettle. The glycine crystallization regulation and control device provided by the utility model can regulate and control the pH value to be close to a glycine isoelectric point in an alcohol precipitation process, and can track the adding amount of methanol in real time.

The invention belongs to the field of inorganic chemical industry, and particularly relates to a potassium carbonate production technology, in particular to a method for purifying a copper ion-containing pesticide synthesis byproduct potassium chloride and directly using the copper ion-containing pesticide synthesis byproduct potassium chloride to produce potassium carbonate. The method comprises the following steps: purifying a byproduct potassium chloride to obtain a refined byproduct potassium chloride solution V; conveying the refined byproduct potassium chloride solution V into a cation exchange resin bed, and carrying out ion exchange to respectively obtain a potassium bicarbonate solution and an ammonium chloride solution; the potassium bicarbonate solution and the ammonium chloride solution are subjected to evaporation, concentration, crystallization and centrifugal separation respectively, so that a potassium bicarbonate wet product and an ammonium chloride wet product are correspondingly obtained respectively; and calcining the potassium bicarbonate wet product at high temperature to obtain potassium carbonate. The method has the technical advantages of being low in energy consumption, free of waste water, free of newly-added pollutants and impurities and the like.

The invention relates to the technical field of industrial-grade glycine production, in particular to a process and a device for purifying a byproduct ammonium chloride of industrial-grade glycine. The method comprises the following steps: decoloring methanol mother liquor from which glycine is separated through activated carbon or an aminated multi-walled carbon tube; continuously feeding the mixture and by-product red ammonium chloride into a pulping kettle, and fully stirring and mixing; continuously extracting the slurry, feeding the slurry into a horizontal scraper centrifuge to separate out wet ammonium chloride, and returning the separated filtrate to a rectification mother liquor ground pool; the filtrate normally enters a methanol recovery and red ammonium chloride recovery process flow, and an ammonium chloride wet product enters a disc dryer to be subjected to micro-negative-pressure drying, so that agricultural high-grade ammonium chloride can be produced. Firstly, the quality of the byproduct ammonium chloride of glycine can be improved from an agricultural qualified product to a superior product; 2, the quality of ammonium chloride is improved, and part of organic matters are intermittently recovered; and 3, the methanol mother liquor generated by the glycine is utilized, so that the normal operation of the glycine is not changed or influenced.

The invention relates to a method for green vanadium precipitation and sodium-ammonium circulation of a sodium modified vanadium solution, and belongs to the technical field of hydrometallurgy. The method comprises the following steps: adding hydrochloric acid and ammonium chloride into the sodium vanadium solution, adjusting the pH value, carrying out heating reaction, and carrying out solid-liquid separation to obtain ammonium polyvanadate and vanadium precipitation wastewater; adding a reducing agent into the vanadium precipitation wastewater for reduction reaction; adding a polycarboxylic acid water reducer, adjusting the pH value with ammonia water, and carrying out solid-liquid separation to obtain purified wastewater and vanadium-chromium filter residues; introducing carbon dioxide gas into the purified wastewater until the purified wastewater is saturated, cooling, crystallizing, and carrying out solid-liquid separation to obtain sodium bicarbonate solid and crystallization mother liquor; and evaporating and concentrating the crystallization mother liquor until the concentration of ammonium chloride is 65-75g / L, then cooling and crystallizing at the temperature of-10-20 DEG C, and carrying out solid-liquid separation to obtain ammonium chloride solid and residual wastewater. According to the invention, high-efficiency and high-purity recovery of sodium and ammonium ions and closed circulation of the system are realized, and the problems of sodium and ammonium circulation and impurity accumulation in the traditional process are solved.

The invention relates to the technical field of saline-alkali ore development, and discloses a method for processing alkali and ammonium chloride from saline-alkali ore in a short process. The method comprises the following steps: filtering saline-alkali brine extracted from saline-alkali ores, reacting with carbon dioxide to generate sodium bicarbonate, crystallizing and separating out the sodium bicarbonate to form baking soda slurry, carrying out solid-liquid preliminary separation on the baking soda slurry, washing a separated baking soda wet filter cake with water, and calcining; sodium carbonate generated by decomposition is cooled and sieved, and the sieved lower-layer product is a qualified sodium carbonate product; ammonium bicarbonate and sodium chloride are subjected to a double decomposition reaction, ammonium chloride and sodium bicarbonate crystals are generated, ammonium chloride mother liquor obtained after sodium bicarbonate is separated is pumped to a rotary precipitation machine, sodium chloride powder is added, ammonium chloride crystals are separated out, ammonium chloride slurry is formed, the separated ammonium chloride crystals are dried, screened and packaged, and qualified ammonium chloride products are produced. According to the method, all salt and alkali with economic value in the salt and alkali brine are processed and utilized, and benefit development of the high-salt-content trona ore is achieved.

The invention belongs to the technical field of chemical production, and particularly relates to a maltol chlorination neutralization reaction method and application. Comprising the following steps: putting 2m < 3 > of materials in a chlorination hydrolysis kettle into a neutralization kettle, stirring at 80r / min, and cooling to 60 DEG C; adding 1.6 m < 3 > of trichloromethane according to the ratio of the neutralization solution to the trichloromethane being 1: 0.8; introducing ammonia to adjust the pH value to 2.5-3.5, and standing for layering for 10 minutes; preheating the heavy phase to 120 DEG C, feeding the heavy phase into a sublimation kettle (vacuum is-0.065 to-0.096 MPa, and kettle temperature is less than 220 DEG C), sublimating, and freezing and centrifuging to obtain a maltol crude product; and freezing and centrifuging the light phase to obtain ammonium chloride salt. The method provided by the invention has the advantages of fast reaction, high yield, reduction of sewage amount and treatment cost, and improvement of device safety, and is suitable for ethyl maltol production.

The invention relates to a resourceful treatment method for dried carnallite of ammonium chloride crystallization mother liquor, and belongs to the technical field of waste residue treatment in the field of ionic rare earth hydrometallurgy. An adsorption technology and a chemical precipitation method are adopted, pollutants are separated from the waste residues step by step, crystal form precipitates of calcium sulfate, calcium carbonate and ammonium magnesium phosphate are generated, solid-liquid separation is carried out, and then evaporated carnallite is converted into a high-purity ammonium chloride solution. The method is suitable for dry carnallite treatment of ammonium chloride crystallization mother liquor with various components in different proportions, impurity elements in carnallite are gradually separated by adopting a fractional precipitation method according to the fact that the solubility product constants of sulfide precipitation, calcium sulfate, calcium carbonate and magnesium ammonium phosphate are very small, technological parameters are strictly controlled, and the quality of the carnallite is improved. According to the method, the transformation from the dried carnallite of the ammonium chloride crystallization mother liquor to the ammonium chloride high-purity solution is realized, precipitation and adsorption materials in the steps are easy for solid-liquid separation, the process technology is simple, operation and control are easy, the consumption of chemical reagents is low, and the carnallite treatment cost is low.

The invention belongs to the technical field of fluosilicic acid utilization, and relates to a potassium fluosilicate decomposition method and application of the potassium fluosilicate decomposition method in preparation of hydrogen fluoride from fluosilicic acid. The method comprises the following steps: firstly, mixing an auxiliary agent with ammonia water, then mixing with potassium fluosilicate to form a decomposition system, adjusting the temperature of the decomposition system to 20-70 DEG C, stirring the decomposition system, simultaneously applying ultrasonic waves, and reacting for 5-10 hours to realize decomposition of potassium fluosilicate. In addition, solid potassium fluosilicate is obtained by adding soluble potassium salt into fluosilicic acid; the potassium fluosilicate is decomposed to obtain a fluoride salt solution, the fluoride salt solution is heated to expel ammonia and then reacts with fluosilicic acid to obtain an ammonium fluoride solution, the ammonium fluoride solution reacts with soluble calcium salt to obtain calcium fluoride solid, and the calcium fluoride solid reacts with concentrated sulfuric acid to obtain hydrogen fluoride. The potassium fluosilicate decomposition method can solve the problem that reaction raw materials are wrapped by reaction products, the raw material utilization rate and the product yield are remarkably improved, and the potassium fluosilicate decomposition method can shorten the technological process and reduce the production cost when applied to preparation of hydrogen fluoride from fluosilicic acid.

The invention belongs to the field of chemical engineering, and particularly relates to a preparation method of an electronic-grade ammonium fluoride solution. The method comprises the following steps: taking a solid-state ammonia source and hydrogen fluoride as a solid-phase raw material and a gas-phase raw material respectively, putting the solid-state ammonia source into a reaction container, taking inert gas as carrier gas, mixing the carrier gas with hydrogen fluoride gas to form reaction gas, and heating the reaction gas; introducing the reaction gas into the reaction container to be in contact with a solid ammonia source to carry out temperature-controlled solid-gas contact reaction; in the reaction process, the temperature of the reaction container is monitored, introduction of hydrogen fluoride is stopped and the carrier gas is continuously introduced after the reaction container starts to be cooled, and after continuous cooling, the reaction container is stopped and a solid-phase product is recovered; and preparing the recovered solid-phase product into an electronic-grade ammonium fluoride solution with a target concentration according to requirements. The novel solid-gas contact thermal reaction method is adopted, the preparation difficulty and equipment requirements of the electronic-grade ammonium fluoride solution are effectively reduced, operation is convenient, meanwhile, the safety of the preparation process is higher, and the utilization rate of raw materials is higher.

The invention discloses a cobalt carbonate wastewater recycling application method, belongs to the field of industrial wastewater treatment, and solves the problems of low ammonium chloride yield and high reagent consumption in the existing method. The method comprises the following steps: carrying out decarburization treatment, wherein the decarburization pH value is 6.01-6.05; carrying out two-stage de-weighting; the water subjected to weight removal enters an MVR evaporation system to be evaporated, and the water enters a falling film evaporator after being heated by a plate heat exchanger; the slurry enters a forced evaporator to be further evaporated and concentrated; the slurry enters a thickener and is circularly separated in the thickener, concentrated liquid enters a centrifugal separation procedure, hot steam is conveyed into a discharging conveying belt and a discharging pipeline in the salt discharging process of a centrifugal machine, drying is carried out while salt discharging is carried out, and ammonium chloride is obtained. According to the invention, the working procedures are improved, so that the operation process is greatly shortened, the energy-saving effect is obvious, the yield of ammonium chloride is increased by 15-20%, the consumption of hydrochloric acid is reduced by 30%, and the consumption of ammonia water is reduced by 10-15%.

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 utility model discloses an ammonification reaction device and relates to the technical field of chemical equipment. The ammoniation reaction device comprises a plurality of ammoniation reaction kettles, a gas inlet pipeline, a liquid inlet pipeline and a plurality of overflow pipelines, the plurality of ammoniation reaction kettles comprise a first ammoniation reaction kettle, a second ammoniation reaction kettle and a third ammoniation reaction kettle which are communicated in sequence, and the gas inlet pipeline comprises a main pipeline and a plurality of branch pipelines. Flow control valves are arranged on the plurality of branch pipelines, and the gas conveying ends of the plurality of branch pipelines are respectively communicated with the gas inlets of the plurality of ammonification reaction kettles, so that ammonia gas is respectively introduced into the plurality of ammonification reaction kettles; the liquid inlet pipeline is communicated with a liquid inlet of the first ammonification reaction kettle so as to introduce hydrochloric acid into the first ammonification reaction kettle. The ammonification reaction kettles are connected in series, and the ammonia gas introduction amount of different ammonification reaction kettles is controlled, so that the problem that ammonia gas and hydrochloric acid violently react in the reaction kettles can be solved, the reaction process is better controlled, and the reaction efficiency is improved.

The utility model belongs to the technical field of energy conservation and environmental protection, and relates to a continuous mineralization system which comprises a phosphogypsum supply device, a mineralization reaction kettle, a circulating system, a flue gas supply device, a flue gas heat exchanger, a liquid-solid separator and a crystallization tower, the liquid inlet end of the circulation system is communicated with a circulation outlet in the lower portion of the mineralization reaction kettle through a circulation pipeline, the discharging end of the circulation system is connected to a circulation feeding port of the mineralization reaction kettle, the flue gas supply device supplies flue gas to the circulation system, the discharging port of the mineralization reaction kettle is connected to the liquid-solid separator through a pipeline, and the liquid-solid separator is connected with the liquid-solid separator through a pipeline. The liquid-solid separator is provided with a solid outlet and a liquid outlet, and the liquid outlet is connected to the crystallization tower through a pipeline. According to the intermittent reaction device, the reaction efficiency is improved, dynamic balance of raw material adding and product outputting can be achieved through the reaction efficiency, and the problem of discontinuous reaction in an intermittent reaction device is solved.

The invention relates to the technical field of wastewater treatment, and provides a salt-containing wastewater carbon sequestration alkali production system and an alkali production method thereof. The output end of the pretreatment unit is connected with an evaporation and concentration unit, and the pretreatment unit is used for removing silicon, fluorine, COD (Chemical Oxygen Demand) and impurities in the salt-containing wastewater; the evaporation and concentration unit is used for carrying out evaporation and concentration on the pretreated salt-containing wastewater and outputting a saturated salt solution; the carbonization unit is used for carrying out carbonization reaction treatment on the saturated salt solution and outputting sodium bicarbonate precipitate; the roasting unit is used for filtering and roasting the sodium bicarbonate precipitate to obtain filtered mother liquor and an alkali product; and the crystallization unit is used for carrying out evaporation and concentration treatment on the filtered mother liquor output by the roasting unit so as to separate ammonium chloride and ammonium sulfate through fractional crystallization. Carbon sequestration is carried out through the salt-containing wastewater to prepare sodium carbonate with high added value, zero emission, carbon sequestration environmental protection and resource utilization of the salt-containing wastewater are organically combined together, and great environmental protection benefits and economic benefits are achieved.

The invention belongs to the technical field of precursor mother liquor treatment, and particularly relates to a method for treating cobalt carbonate mother liquor, which comprises the following steps: a, adding hydrochloric acid into the cobalt carbonate mother liquor to adjust the pH value to be acidic for decarburization; b, removing cobalt from the decarbonized cobalt carbonate mother liquor in the step a through cobalt removal resin; c, ammonium sulfide is added into the cobalt carbonate mother liquor subjected to cobalt removal in the step b for complex breaking; and d, the cobalt carbonate mother liquor subjected to complex breaking in the step c is continuously subjected to cobalt removal through the cobalt removal resin. According to the method, cobalt removal resin and low-concentration ammonium sulfide are utilized, cobalt in the cobalt carbonate mother liquor is fully recycled, and meanwhile the quality of the byproduct ammonium chloride is improved.

A method for synthesis of Lorazepam in a continuous flow using continuous flow reactor, in which method comprises five steps including N-acylation, diazepine ring closure, imine N-oxidation, Polonovski-type rearrangement, and ester hydrolysis; a green reagent comprising a peroxide reagent and rhenium oxide catalyst for N-oxidation of delorazepam; and an ammonium source combination for the synthesis of delorazepam.

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 discloses a treatment method of titanium-containing solid slag generated in preparation of a polyolefin catalyst, and comprises the following steps: S1, uniformly mixing titanium-containing solid slag with ammonium carbonate or ammonium bicarbonate through stirring to obtain titanium ammonium material; S2, performing stirring hydrolysis on the obtained titanium ammonium material to obtain a hydrolysis liquid; S3, performing solid-liquid separation on hydrated titanium dioxide slurry in a lower layer after layering to obtain hydrated titanium dioxide, and removing oil from ammonium chloride solution containing floating grease in an upper layer; and S4, mixing the separated liquid obtained after the solid-liquid separation in S3 with the ammonium chloride solution after oil removal to obtain a combined liquid, and sequentially performing evaporation concentration, crystallization and centrifugal dehydration on the combined liquid to obtain ammonium chloride. The application can simultaneously recover titanium dioxide and by-product ammonium chloride, has high treatment efficiency, and does not generate waste water and solid waste in the whole production process, which is beneficial to environmental protection. Meanwhile, the whole process operation is simple, the equipment requirement is low, the cost is low, and the practicability is high.

The invention relates to the technical field of inorganic chemical industry, and particularly discloses an improved sodium carbonate production process by an ammonia-soda process, which comprises the steps of carbonization alkali precipitation, ammonia-sodium separation, ammonia regeneration, magnesium extraction, calcium separation and the like. Meanwhile, resources such as water resources, ammonia and carbon dioxide are recycled, and the method is suitable for large-scale industrial soda ash production enterprises, meets the environment-friendly requirement and the efficient resource utilization requirement, and can be widely applied to the industrial fields of chemical engineering, building materials, food processing and the like which depend on soda ash and calcium-magnesium byproducts.

The invention discloses a neodymium iron boron secondary waste recovery treatment method which comprises the following steps: step 1, reacting neodymium iron boron secondary waste with an acid solution, controlling the pH value of the solution after the reaction to be 0.5-1.5, and carrying out solid-liquid separation to obtain a filtrate A containing Fe < 3 + > and a filter residue A; 2, Fe < 3 + > in the filtrate A is reduced into Fe < 2 + >, solid-liquid separation is performed, and filtrate B and filter residues B are obtained; 3, adjusting the pH value of the filtrate B to 2-6, and carrying out solid-liquid separation to obtain filtrate C and filter residues C; 4, the filtrate C reacts with a precipitant, solid-liquid separation is conducted, and filter residues D and filtrate D are obtained. According to the scheme, short-process comprehensive utilization of oxalic acid, hydrochloric acid and iron resources is achieved, the operation environment is friendly, strong acid and strong alkali resistant equipment is not needed, and green and efficient comprehensive utilization of the iron-containing waste residues and the oxalic acid wastewater can be achieved at the same time.

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.

The application discloses a rare earth carbonate production system and a production method, and belongs to the field of rare earth materials; the production system fully utilizes the characteristics that the supernatant in the precipitation reactor has few impurities and has certain heat; after impurities are filtered again through a filter, evaporation and concentration are directly carried out through an evaporator to obtain high-temperature steam and concentrated ammonium chloride solution; the concentrated ammonium chloride solution can be used to recycle ammonium chloride through a subsequent crystallization process; the obtained high-temperature steam provides heat for maintaining the reaction temperature of the precipitation reactor through a heat exchanger, and the cooled high-temperature steam finally becomes recyclable industrial wastewater.

The invention belongs to the technical field of waste liquid treatment, and particularly relates to a method for producing cuprous oxide from PCB waste resin powder and copper-containing etching waste liquid, and the method comprises the following steps: S1, mixing and reacting the PCB waste resin powder and the copper-containing etching waste liquid to obtain a cuprous solution 1; s2, phosphoric acid and ammonia water are added into the cuprous solution 1, stirring and filter pressing are conducted, and a cuprous solution 2 and impurity-removed filter residues are obtained; and S3, adding ammonia water into the cuprous solution 2, centrifuging and washing to obtain a cuprous oxide and ammonium chloride solution. According to the method provided by the invention, high-purity cuprous oxide can be obtained, the purity is greater than 99%, the copper recovery rate is greater than 99%, copper is not detected from the reacted PCB waste resin powder, the economic benefit is improved, and the cost is reduced.