304results about "Ammonium sulfates" patented technology

The invention belongs to the technical field of environmental protection, and particularly relates to a cement kiln flue gas desulfurization and decarburization and mineralization solid waste gypsum integrated treatment method, an adopted treatment system comprises a reaction tower, and the reaction tower is sequentially divided into a desulfurization area, a decarburization area, a mineralization reaction area II and a mineralization reaction area I through partition plates from bottom to top; a washing area is further arranged above the first mineralization reaction area, raw flue gas of the cement kiln is input from the bottom and discharged after being sequentially treated by all the areas, and solid waste gypsum slurry prepared by a solid waste gypsum slurry preparation tank is sprayed downwards from the upper portion of the first mineralization reaction area. Solid waste gypsum slurry accumulated at the bottom of the first mineralization reaction area is input into a second filter to be filtered, then the filtered solid part is evenly sprayed downwards from the upper portion of the second mineralization reaction area, filtrate output by the second filter is subjected to evaporative crystallization, and an ammonium sulfate product is obtained. According to the method, the technical problem of insufficient reaction caused by difficult realization of removal of reaction raw materials and enrichment of reaction products is solved.

The invention relates to the field of preparation of battery materials and precursors of the battery materials, and discloses a method for efficiently preparing battery-grade manganous-manganic oxide by using electrolytic manganese residue leachate and a harmless treatment method for tail liquid of the battery-grade manganous-manganic oxide. Treating the manganese residue leachate concentrated water obtained in the previous step with ammonia water and oxygen to prepare battery-grade manganous-manganic oxide; adjusting the pH value of the filtrate obtained in the previous step to prepare magnesium hydroxide; the filtrate obtained in the previous step is subjected to evaporative crystallization, ammonium sulfate is prepared, finally, harmless treatment of preparation of battery-grade manganous-manganic oxide from the manganese residue leachate and the tail liquid of the battery-grade manganous-manganic oxide is achieved, and the recovery efficiency of valuable components is greatly improved.

The invention belongs to the technical field of solid waste control, and particularly relates to a VOCs catalyst based on manganese slag, a preparation method and application of the VOCs catalyst and a manganese slag resource utilization method. The method comprises the following steps: mixing manganese slag with a sulfuric acid solution, and carrying out solid-liquid separation to obtain a washing solution and washing slag; mixing the washing solution and the carbonate aqueous solution, and sequentially carrying out precipitation reaction, standing and solid-liquid separation to obtain a precipitate and a separation solution; roasting the precipitate to obtain a roasted substance, washing the roasted substance with an organic acid solution and water in sequence, and then drying to obtain a purified product; mixing the purified product, a binder and water to obtain a mixed material; the mixed material is subjected to extrusion molding and then dried, and the VOCs catalyst based on the manganese slag is obtained. According to the method, resource utilization of metal elements in the manganese slag is achieved, and the excellent VOCs catalytic oxidation effect is achieved on the premise that the production cost of the catalyst is greatly reduced.

The invention relates to the technical field of preparation of nano aluminum oxide, in particular to a preparation method of high-purity nano aluminum oxide, which comprises the following steps: dissolving aluminum ammonium sulfate in high-temperature hot water, filtering, recrystallizing, drying the recrystallized aluminum ammonium sulfate to remove moisture to obtain dried aluminum ammonium sulfate, and roasting the dried aluminum ammonium sulfate at high temperature to obtain the high-purity nano aluminum oxide. The preparation method comprises the following steps: calcining the alumina powder, decomposing to generate alpha-Al2O3 nano-alumina, simultaneously releasing ammonia gas and sulfur dioxide gas, introducing the ammonia gas and sulfur dioxide released in the roasting process into water through a negative pressure absorption device to generate an ammonium sulfate solution, and finally obtaining the superfine alumina powder with the particle size reaching the nanoscale. According to the method, the market value of the product is improved, ammonia gas and sulfur dioxide generated in the roasting process are absorbed to successfully generate a byproduct ammonium sulfate, and the byproduct ammonium sulfate is reused in a catalyst wet vanadium precipitation process, so that the environmental pollution is reduced, the output quality of aluminum oxide is improved, and the production loss caused by impurities is reduced, thereby improving the production efficiency and economic benefits.

The invention relates to the technical field of solid waste recycling, and provides a secondary aluminum ash wet treatment resource utilization method which comprises the following steps: S1, a pretreatment step, S2, a slurrying reaction step, S3, a slurry impurity removal step, S4, an enhanced reaction step and S5, an oxidation reaction step. S6, a carbonization reaction step; s7, a flocculating settling step; s8, washing and separating; the step S1 is a pretreatment stage, the steps S2-S6 are wet reaction stages, the steps S7-S8 are solid-liquid separation stages, and the step S9 is a product drying stage, and the method has the effects that the secondary aluminum ash treatment process is simplified, the cost is reduced, and recycling products are enriched.

The present invention provides a method and device system for preparing sodium carbonate and / or sodium bicarbonate and co-producing ammonium sulfate from sodium-based wastewater. According to the phase equilibrium law of a multi-component water-salt system, through the regulation of crystallization kinetics and supersaturation, the sodium-based wastewater does not need to be evaporated and crystallized to produce sodium sulfate solid. Instead, the wastewater after simple pretreatment is directly treated to achieve gradient crystallization separation of sodium sulfate, ammonium sulfate and sodium bicarbonate, thereby obtaining high-quality sodium bicarbonate, sodium carbonate and ammonium sulfate products.

The present invention provides a method for preparing soda ash or baking soda by resource utilization of coal chemical concentrated brine, the method comprising: removing harmful impurities from coal chemical concentrated brine by induced crystallization, acidolysis and thermally stimulated oxidation to obtain mixed salt and mixed salt mother liquor; separating sodium nitrate from the mixed salt mother liquor, double decomposing and evaporating the mixed salt, ammonium chloride mother liquor and ammonium sulfate mother liquor to obtain sodium sulfate mixed crystals and ammonium chloride enriched solution; obtaining ammonium chloride and ammonium chloride mother liquor from the ammonium chloride enriched solution; dissolving and salting out the sodium sulfate mixed crystals and sodium bicarbonate mother liquor to obtain a saturated sodium sulfate solution and crude ammonium sulfate; obtaining ammonium sulfate and ammonium sulfate mother liquor from crude ammonium sulfate; double decomposing the saturated sodium sulfate solution and ammonium bicarbonate to obtain a sodium bicarbonate product and a sodium bicarbonate mother liquor. The method provided by the present invention obtains baking soda and co-produces high-value ammonium salt products from coal chemical concentrated brine in a short process and at a low cost, thereby realizing the reduction, harmlessness and resource utilization of coal chemical wastewater.

The invention discloses an ammonia desulfurization system and method based on zone control. The ammonia desulfurization system comprises a desulfurization tower, an absorption circulating tank, an ammonia water tank, a rinsing tank and a process water tank. The desulfurization tower is sequentially provided with a flue gas outlet, a demisting section, a second-section absorption layer, a first-section absorption layer and a concentration section from top to bottom. A partition plate is arranged in the absorption circulating tank and divides the absorption circulating tank into an upper oxidation tank and a lower absorption circulating section. An aeration pipe is arranged in the upper oxidation tank, and the upper oxidation tank is connected with a spraying liquid inlet of the second absorption layer through a pipeline; the lower concentration section of the desulfurizing tower is connected with the oxidation tank through a liquid conveying pipeline. The water washing tank supplies water to the demisting section and the absorption circulating tank; the ammonia water tank supplements ammonia water to the oxidation tank, the first-section absorption layer and the lower absorption circulation section respectively; recycled liquid of the demisting section is connected back to the rinsing bath through a pipeline. According to the invention, absorption and oxidation are partitioned in the same tank, so that coupling interference is eliminated; two-stage absorption and demisting recovery are matched, so that ammonia escape is effectively controlled while efficient removal of sulfur dioxide is guaranteed.

The present application relates to the technical field of ammonia compound preparation, in particular to a method for preparing ammonium sulfate and co-producing sodium bicarbonate by using sodium sulfate, comprising the following steps: mixing industrial-grade liquid ammonia with deionized water to prepare ammonia water with a free ammonia concentration of 60-120 ti (ti is the abbreviation of titer, which is 1 / 20 mol / L), controlling the temperature of the mixing process to be less than or equal to 40 DEG C to avoid ammonia volatilization, pre-carbonizing by passing in CO2 under the conditions of 20-70 DEG C and a carbon dioxide pressure of 0.1-0.6 MPa, and adding sodium sulfate or a mixture of sodium bicarbonate and mirabilite to obtain a pre-carbonized liquid. The present application adopts an integrated process of pre-carbonization, clarification, carbonization, ammonia separation and low-temperature crystallization, and ammonia evaporation circulation, and can be operated continuously or intermittently, has low industrial implementation difficulty, strong running stability, separates ammonium sulfate by using ammonia separation and low-temperature crystallization technology, replaces the traditional evaporation and concentration process, combines material recycling design, and reduces the energy consumption per unit product compared with the traditional process.

The invention relates to a wet-process phosphoric acid production process for phosphorite all-element resource comprehensive utilization, and belongs to the field of phosphorus chemical industry production. The process comprises the following steps: decomposing phosphorite, a decomposition solution and a base solution to obtain a primary decomposition solution and primary decomposition slag; crystallizing the primary decomposition liquid to obtain ammonium dihydrogen phosphate crystals and crystallization mother liquor thereof; ammonium dihydrogen phosphate is directly sold as a product or transformed to produce high-quality phosphoric acid, and the obtained crystallization mother liquor is returned to be used for preparing a decomposition solution or a decomposition base solution; transforming the primary decomposition slag by ammonium bicarbonate to obtain an ammonium sulfate solution and a calcium carbonate filter cake; returning the ammonium sulfate solution for preparing decomposition liquid or comprehensively utilizing; transforming the calcium carbonate filter cake through ammonium chloride to obtain a mixed gas containing CO2 and NH3, a calcium chloride solution and insoluble filter residues; the calcium chloride solution further produces a calcium-containing compound. According to the process provided by the invention, the phosphogypsum can be consumed from the source, the consumption of sulfuric acid is low, the fluorine leaching rate is high, the comprehensive utilization rate of calcium resources is high, and the quality of phosphoric acid obtained through transformation is good.

The invention provides a process for the preparation of sul furic acid and minerali zation of CO2 from industrial gases, comprising : CO2- absorption step, comprising continuously sparging C02- containing gas through an aqueous solution of ammonia in a first reactor, or continuously sparging C02-containing gas and ammonia gas through water, to form [ (NH4 ) 2CO3 / NH4HCO3 ] solution; continuously withdrawing [ (NH4 ) 2CO3 / NH4HCO3 ] solution from the first reactor and providing said [ (NH4 ) 2CO3 / NH4HCO3 ] solution, after it has been optionally cooled, to a second reactor, wherein NH3 and CO2-bearing gas stream discharged from the first reactor is fed to the second reactor, thereby producing (NH4 ) 2CO3 aqueous solution in the second reactor and releasing an essentially NH3 and CO2- free gas from the second reactor; CO2-minerlai ztion step, comprising reacting the (NH4 ) 2CO3 in water with calcium sul fate [ CaSO4 ], to form a solution of ammonium sul fate [ (NH4 ) 2SO4 ] and precipitate solid calcium carbonate [ CaCO3 ], separating CaCO3 from said solution and recovering ammonium sulfate crystals from the solution; and H2SO4- format ion step, comprising thermally decomposing the (NH4 ) 2SO4 to give sul furic acid and supplying a stream of ammonia released from the thermally decomposed (NH4 ) 2SO4 to the CO2-absorption step.

The invention discloses a method for efficiently recycling ammonium sulfate in electrolytic manganese residues. The method comprises the following steps that firstly, 0.5-1.5 parts of the electrolytic manganese residues and 2-4 parts of clear water are taken and put into a stirring machine to be fully and evenly stirred; 2, adding an acidic reagent into the slurry obtained in the step 1 after fully and uniformly stirring, adjusting the pH value, and then continuously stirring to obtain slurry; 3, the slurry obtained in the step 2 is pumped into a filter press for solid-liquid separation, filtrate and filter residues are obtained, and the filtrate is collected for standby application; 4, the filtrate in the step 3 is returned to the step 1 to replace 2-4 parts of clear water, and then 0.5-1.5 parts of electrolytic manganese residues are taken and put into a stirrer to be fully and evenly stirred; 5, repeating the step 2 and the step 3 on the slurry in the step 4 to obtain filtrate for later use; the invention aims to solve the problems that the electrolytic manganese residue recovery device in the prior art needs to be washed for multiple times, the water consumption is large, other impurities are always remained in water after washing, and the subsequent treatment difficulty is increased.

The application discloses a process for preparing high-molecular-ratio cryolite and ammonium sulfate by using fluorine-containing etching waste liquid, and comprises the following steps: adding sodium metaaluminate slurry and sodium sulfate solution into the fluorine-containing etching waste liquid, then adjusting pH to be acidic by using a sulfuric acid solution, carrying out heating reaction, then carrying out centrifugal separation treatment, and drying the obtained cryolite precipitate; adding sodium metaaluminate slurry into the fluorine-containing supernatant, and obtaining defluorination filtrate by treatment; adding a sulfuric acid solution into the defluorination filtrate, carrying out neutralization reaction, then carrying out vacuum evaporation on the reaction mixture containing ammonium sulfate, carrying out centrifugal separation treatment after cooling, drying the obtained ammonium sulfate precipitate, and obtaining ammonium sulfate product. The fluorine ion in the fluorine-containing etching waste liquid can be effectively utilized, the generated cryolite product can reach the national standard of high-molecular ratio, the fluorine ion content of the generated filtrate is less, so that the filtrate can enter the synthesis of ammonium sulfate, and no waste liquid is generated in the process.

The invention relates to the technical field of chemical engineering, and discloses an amide oil separation and ammonium sulfate crystallization integrated device. Comprising a neutralization reactor, a settling separation tank, a pre-crystallization solution tank, a DTB crystallizer, a centrifugal machine, a settling separator, a dryer, a mother liquor tank, a condensate water tank, an amide oil decanter, an ammoximation tert-butyl alcohol tower reboiler, a mother liquor heater set, a condenser, a vacuumizing condensing unit, a stirrer set and a reactor circulating pump. The invention further comprises a process for preparing the large-particle ammonium sulfate crystal from the saturated amide oil solution, rearrangement liquid from a lactam rearrangement system and gas ammonia are added into a neutralization reactor through an external circulation pipeline, and the large-particle ammonium sulfate crystal is prepared by fully utilizing heat in the gas ammonia dissolution and neutralization reaction and crystallization process. By combining the compound additive, the seed crystal and the continuous crystallization technology, the generation of large-particle ammonium sulfate crystals is promoted, meanwhile, the crystallization process is optimized, an efficient amide oil separation and continuous crystallization mode is realized, the energy consumption is saved, and the production efficiency is improved.

The present disclosure relates to new methods and processes of byproduct conversion, wastewater remediation, byproduct upcycling / recycling, and sustainable cyclic methods thereof.

The invention relates to a method for recovering a magnesium element from a magnesium-containing solution and application thereof, and relates to the technical field of wastewater treatment. According to the method, magnesium precipitation separation is achieved through the steps of alkalization, carbonization, flash decomposition and the like, and basic magnesium carbonate, active magnesium oxide and ammonium sulfate with high additional values can be recycled.

The present application belongs to the technical field of pharmaceutical production, and particularly relates to a method and device for preparing L-magnesium aspartate by selective ion replacement electrodialysis. The present application uses a selective ion replacement electrodialysis device to convert an intermediate product of industrial L-aspartate production, L-ammonium aspartate, to prepare L-magnesium aspartate. The selective permeability of the ion exchange membrane is used to realize the replacement of cations in two different electrolytes, so that the ions are recombined to form L-magnesium aspartate. Thus, the deficiencies of the prior art process of first preparing L-aspartate and then preparing L-magnesium aspartate are avoided. The purity of the L-aspartate prepared according to the present method and the conversion rate of the L-ammonium aspartate both reach more than 97%, and the energy consumption is low. The L-magnesium aspartate product with high purity can be quickly prepared, and the by-product ammonium sulfate can also be obtained in the product chamber 2, thereby improving the economic benefits of the process and having important industrial application value.

A process for the synthesis of hydrogen by catalytic cleavage of ammonia; the process comprising the step of subjecting an ammonia-containing stream (10) to a catalytic cleavage step (11) in the presence of heat to produce a combustion gas and a hot cleavage stream (14) containing nitrogen, hydrogen and potentially residual ammonia, and optionally water; the process further comprising the step of subjecting the hot cleavage stream to a hydrogen recovery step to produce a high-purity hydrogen stream (22).

The utility model discloses a chemical waste gas treatment device, belongs to the technical field of chemical waste gas treatment, and solves the problems of low efficiency and incomplete treatment of an existing waste gas treatment method. The input end of the alkaline waste gas collecting induced draft fan is communicated with the alkaline waste gas collecting pipe, and the output end is communicated with the input end of the pickling tower. The output end of the pickling tower and the output end of the alkaline washing tower are both communicated with the input end of the biological treatment unit, the output end of the biological treatment unit is communicated with the input end of the activated carbon adsorption tower, the output end of the activated carbon adsorption tower is communicated with the input end of the air exhaust induced draft fan, and the output end of the air exhaust induced draft fan is communicated with the input end of the coal-fired boiler. The output end of the coal-fired boiler is communicated with the input end of the denitration unit, the output end of the denitration unit is communicated with the input end of the bag-type dust removal unit, the output end of the bag-type dust removal unit is communicated with the input end of the desulfurization unit, and the output end of the desulfurization unit is communicated with the input end of the cyclone. The chemical waste gas treatment device can efficiently and thoroughly treat chemical waste gas.

The present application belongs to the technical field of energy saving and consumption reduction of titanium dioxide production, and particularly relates to a method for energy saving and pollution reduction in the calcination process of sulfuric acid method titanium dioxide. The present application realizes the cascade utilization of high-temperature to medium-low-temperature waste heat through the integrated scheme of "preheating and quality improvement + oxygen-rich calcination + tail gas synergistic desulfurization and denitrification + resource utilization of by-products", that is, the calcination tail gas (1000-1100℃) is first used to generate steam for production through a waste heat boiler, and then is used for preheating and drying metatitanic acid after being cooled, thereby realizing the cascade utilization of high-temperature to medium-low-temperature waste heat, and simultaneously, the oxygen-rich combustion improves the fuel efficiency, the natural gas combustion is more sufficient, the energy consumption per unit product is reduced by 30-40%, and the ammonia method is used to simultaneously remove SO2 and NO x in a single reactor, the desulfurization efficiency is greater than or equal to 95%, the denitrification efficiency is greater than or equal to 85%, the concentration of dust in the tail gas after being removed by a bag filter is less than or equal to 10 mg / Nm3 for emission, the unity of environmental benefits and economic benefits is realized, and a new path is provided for the green upgrading of the sulfuric acid method titanium dioxide industry.

This invention relates to a method for the resource utilization of ammonia-containing waste generated during beryllium smelting, belonging to the technical field of wastewater and waste residue treatment and resource utilization. The method includes: mixing aluminum ammonium vanadium slag with beryllium washing wastewater; mixing the resulting aluminum ammonium vanadium beryllium solution with a calcium-containing transforming agent to obtain aluminum-calcium slag and aluminum ammonium vanadium purified solution; mixing solution A with beryllium precipitation wastewater and adding a calcium-containing alkaline substance to obtain a conditioning solution and gypsum slag; adding a decalcifying agent to the conditioning solution for precipitation and decalcification to obtain decalcified slag and decalcified solution; stripping the decalcified solution to obtain ammonia water and ammonia stripping mother liquor; solution A is an aluminum ammonium vanadium beryllium solution and / or aluminum ammonium vanadium purified solution; or, mixing the aluminum ammonium vanadium purified solution with beryllium precipitation wastewater and evaporating and crystallizing to obtain ammonium salts. This method fully utilizes the ammonia resources in the ammonia-containing waste generated during beryllium smelting, preparing ammonium salts or ammonia water, achieving full recycling of ammonia nitrogen in the production process.

The invention relates to the technical field of ammonia compound preparation, in particular to a method for preparing ammonium sulfate and co-producing sodium bicarbonate by using sodium sulfate, which comprises the following steps: mixing industrial liquid ammonia with deionized water to prepare ammonia water with the free ammonia concentration of 60-120ti (ti titer abbreviation, namely 1 / 20mol / L), and controlling the temperature to be less than or equal to 40 DEG C in the mixing process to avoid ammonia volatilization, cO2 is introduced for pre-carbonization under the conditions that the temperature is 20-70 DEG C and the pressure of carbon dioxide is 0.1-0.6 MPa, sodium sulfate or a mixture of mirabilite and sodium bicarbonate is added, and a pre-carbonization solution is obtained; the process adopts an integrated process of pre-carbonization, clarification, carbonization, ammoniation low-temperature crystallization and ammonia distillation circulation, can be continuously or intermittently operated, is low in industrial implementation difficulty and high in operation stability, separates ammonium sulfate through an ammoniation and low-temperature crystallization synergistic technology, replaces a traditional evaporation and concentration process, is combined with a material cyclic utilization design, and has a good industrial application prospect. The unit product energy consumption is reduced compared with the traditional process.

The utility model discloses an ammonium sulfate and monoammonium phosphate mixed solution evaporative crystallization salt separation treatment system which comprises a preheating unit, an ammonium sulfate evaporation concentration unit, an ammonium sulfate evaporation crystallization unit, a recovery heat exchange unit, an ammonium sulfate post-treatment unit, a monoammonium phosphate cooling crystallization unit, a monoammonium phosphate post-treatment unit and a carnallite treatment unit. According to the technical scheme adopted by the utility model, a mixed solution containing ammonium sulfate and monoammonium phosphate is subjected to combined treatment, so that qualified ammonium sulfate crystal salt, monoammonium phosphate crystal salt and mixed salt can be obtained, and the by-product benefit of a wastewater treatment system can be effectively improved.

The invention discloses a reactor suitable for ammonium sulfate crystallization, and relates to the technical field of ammonium sulfate crystallization. The reactor suitable for ammonium sulfate crystallization comprises a crystallization tank, a heat exchange tank communicated with the crystallization tank, and a heat exchange plate installed in the heat exchange tank and communicated with a water conveying pipe, and the crystal removal assembly comprises a crystal removal plate located outside the heat exchange plate, under the driving of the driving element, crystals formed on the surface of the heat exchange plate are scraped to become seed crystals for growth of the crystallizing tank; the temperature sensor is fixed on the crystal removal plate and is used for detecting the temperature of the surface of the corresponding heat exchange plate and providing a basis for the operation of the switching assembly; and the expansion area is fixedly mounted in the crystal removal plate, deforms under the action of external force to be adaptive to the shape of the heat exchange plate and is adaptively attached to the outline of the whole heat exchange surface, so that dead-corner-free scraping is ensured, uniform pressure is kept, and a product with high quality, uniform granularity and good fluidity can still be produced after the scraped ammonium sulfate crystals continuously grow in the main body solution.

The invention belongs to the technical field of mirabilite resource utilization, and particularly relates to a mirabilite resource utilization method based on micro-nano bubble enhanced mass transfer. The method comprises the following steps: (1) dissolving mirabilite solid waste with water or carrying out concentration treatment on mirabilite waste water to enable the concentration of sodium sulfate to be close to a saturated state so as to obtain a mirabilite solution; (2) firstly introducing ammonia gas in a micro-nano bubble form into the mirabilite solution in the step (1) to form a sodium sulfate solution system rich in dissolved ammonia, and then continuously introducing carbon dioxide in the micro-nano bubble form to carry out a crystallization precipitation reaction; (3) carrying out solid-liquid separation on the reaction material in the step (2), and washing and drying the solid phase to obtain a sodium bicarbonate product; adding sulfuric acid into the liquid phase to react to convert the dissolved sodium bicarbonate into sodium sulfate, then performing concentration-crystallization treatment on the solution to obtain an ammonium sulfate crystal product, and recycling the residual mother liquor in the step (1). According to the method, a high-purity sodium bicarbonate product and a high-purity ammonium sulfate product can be simultaneously obtained through a simple process.

The invention discloses a method for treating nickel precipitates in ammonium sulfate solution and belongs to the field of metallurgy and chemical engineering. The method combines free nickel ions into a stable organic nickel complex precipitate by sequentially adopting a combination of pretreatment, ammonium sulfide nickel precipitation, oxidation and complex breaking, and fenammonium nickel solidification, and finally removes the nickel precipitate by simple filtration. The method can effectively prevent the nickel precipitate from dissolving, solves the problem of excessive heavy metal content caused by the dissolution of heavy metal nickel precipitates in ammonium sulfate solution, and makes the salt product of the purified ammonium sulfate solution reach the GB535-1995 superior product quality standard through evaporation and crystallization, thereby improving economic benefits and avoiding environmental pollution, and having high application value.

The invention provides a method and system for treating wastewater through a magnetic polymerization condensation process, and belongs to the field of ferric phosphate wastewater treatment.The method comprises the steps that composite alkali liquor is added into ferric phosphate wastewater, the pH value of the wastewater is adjusted to be within a preset range, and pretreated wastewater is obtained; adding polycondensation magnetic particles into the pretreated wastewater, and carrying out magnetic polycondensation treatment; carrying out solid-liquid separation on the wastewater subjected to magnetic coagulation treatment to obtain clear water and a coagulation body; carrying out recovery treatment on the polycondensation magnetic particles in the polycondensation body; performing membrane concentration treatment on the clear water to obtain fresh water and concentrated water, recycling the fresh water, and performing evaporation concentration on the concentrated water to obtain an ammonium sulfate byproduct. The iron phosphate wastewater treatment effect is improved, the treatment speed is increased, the wastewater treatment efficiency is improved, and it is ensured that the effluent quality reaches the environmental protection standard. And through recycling of the magnetic particles condensed by magnetic polymerization and recycling of by-products, the overall treatment cost is reduced, waste discharge and environmental pollution are reduced, and the requirements of large-scale industrial production are met.

This invention discloses a system for the co-production of ammonium sulfate and calcium carbonate from phosphogypsum mineralization flue gas and carbon dioxide. The system includes a reactor, a circulating pump, a hydrocyclone separator, a three-stage cooler, an absorption tower, and a three-stage heat pump system. The reactor is used to introduce phosphogypsum slurry, ammonia, and CO2-containing flue gas to form a mixed slurry. The circulating pump is used to input the mixed slurry into the hydrocyclone separator, which separates the mixed slurry into an upward overflowing fluid and a downward swirling fluid. The three-stage cooler is used to cool the first fluid from 60-65°C to 18-20°C in stages. The absorption tower is used to absorb CO2 from the CO2-containing flue gas. The three-stage heat pump system is used to exchange heat with the three-stage cooler and input the heat exchanged heat into the reactor, maintaining the reactor temperature at 60-65°C. This invention solves the technical pain points of the one-step phosphogypsum mineralization technology, which requires high temperatures for the phosphogypsum conversion reaction and low temperatures for CO2 absorption.

The invention discloses a treatment device and a treatment method for acid tar in ammonium sulfate production by a saturator method, and belongs to the technical field of coking. The treatment device comprises a full flow tank, an acid tar conveying inclined pipe, an acid tar heating tank, a conveying pump and a mechanical clarifying tank, an outlet of the full flow tank is connected with one end of the acid tar conveying inclined pipe through a pipeline, an ammonia water conveying inlet is formed in the acid tar conveying inclined pipe, and the other end of the acid tar conveying inclined pipe is connected with the acid tar heating tank; a steam heating pipe inlet is formed in the bottom of the side wall of the acid tar heating tank; a liquid outlet in the bottom is connected with the mechanical clarifying tank through a delivery pump. The inclined angle of the acid tar conveying inclined pipe is set, ammonia water generated by coking is jointly introduced to clean acid tar adhered to the pipe wall, meanwhile, steam is introduced into the acid tar heating tank to melt the acid tar, and finally, precipitation separation is performed in the mechanical clarifying tank, so that the environmental pollution is obviously reduced, the labor intensity of post personnel is reduced, and the production efficiency is improved. And the problem of acid tar treatment is effectively solved.

The present invention relates to a treatment method for the terminal salt-splitting mother liquor of a zero-discharge treatment system for iron phosphate wastewater. Among them, the treatment method for the terminal salt-splitting mother liquor includes: S1. Precipitating heavy metal ions in the salt-splitting mother liquor to obtain a clear liquid; S2. Mixing the clear liquid with a ferrous salt solution and hydrogen peroxide to obtain a mixed slurry; S3. Performing pressure filtration on the mixed slurry to obtain a first filter cake and a pressure filtration mother liquor. Subsequently, washing the first filter cake to obtain a first washing liquid and a second filter cake; S4. Aging, washing, and pressure filtering the second filter cake to obtain a third filter cake and a second washing liquid; S5. Sintering and dehydrating the third filter cake to obtain battery-grade anhydrous iron phosphate; wherein, the pressure filtration mother liquor and the first washing liquid are low-concentration ammonium sulfate solutions, and the pressure filtration mother liquor and the washing liquid are used for refluxing to the iron phosphate wastewater treatment system to prepare ammonium sulfate products; the second washing liquid is used for preparing the ferrous salt solution in step S2.