381 results about "Carbonatation" patented technology

The invention belongs to the technical field of building materials, and discloses a high-activity composite auxiliary cementing material based on carbonated steel slag-carbide slag as well as a preparation method and application of the high-activity composite auxiliary cementing material. The high-activity composite auxiliary cementing material is prepared from the following raw materials in parts by mass: 40 to 55 parts of carbonated steel slag-carbide slag composite micro powder, 30 to 40 parts of high titanium slag, 20 to 25 parts of metakaolin, 3 to 5 parts of ardealite, 3 to 5 parts of calcium carbonate, 3 to 5 parts of calcium carbonate and 3 to 5 parts of calcium carbonate. Wherein the carbonated steel slag-carbide slag composite micro powder is obtained by carrying out carbon sequestration reaction on steel slag and carbide slag in a solution consisting of a carbonization enhancer, an additive and water. On one hand, the CO2 storage amount of the steel slag and the carbide slag is increased, the stability and the activity are improved, on the other hand, the carbonized steel slag-carbide slag and other industrial solid waste are cooperated to achieve a composite superimposed effect, the cement mortar or the concrete can be improved in strength, stability and durability, the comprehensive performance is good, and the cost is low. And the method is green, low-carbon, energy-saving, environment-friendly and wide in popularization and application

The invention relates to a kitchen waste oil recovery treatment method, which comprises: S1, carrying out multi-field synergistic pretreatment: sequentially carrying out ultrasonic wave and high-frequency pulse electric field treatment on waste oil to break an emulsion layer, adding magnetic nanoparticles to adsorb polar impurities, and carrying out magnetic field separation to obtain high-purity oil; s2, supercritical catalytic reaction: under the CO2 supercritical condition, using a core-shell structure composite catalyst to synchronously perform transesterification reaction and glycerol dehydration reaction; s3, dynamic membrane separation: separating biodiesel and glycerol in real time through an intelligent membrane assembly; s4, gradient utilization of energy: recovering reaction waste heat to drive membrane distillation to concentrate wastewater, and using tail gas CO2 for carbonation reaction to generate calcium carbonate. Through four core technologies of multi-field collaborative pretreatment, low-temperature supercritical catalysis, dynamic membrane separation and energy gradient utilization, triple limitations on efficiency, cost and environmental protection in the prior art are remarkably broken through.

The invention provides a method for preparing high-purity vanadium pentoxide from carbonation leachate. The method comprises the following steps: S1) carrying out silicon removal on the carbonation leachate, and carrying out solid-liquid separation to obtain silicon-removed slag and silicon-removed liquid; s2) mixing the post-silicon-removal liquid with a complexing agent, and reacting to obtain a post-reaction liquid; s3) carrying out vanadium precipitation on the reacted liquid to obtain ammonium metavanadate and vanadium precipitation wastewater; s4) oxidizing and calcining the ammonium metavanadate to obtain high-purity vanadium pentoxide; the complexing agent is selected from one or more of ethylene diamine tetraacetic acid, disodium ethylene diamine tetraacetate and tetrasodium ethylene diamine tetraacetate. According to the method, the leaching solution obtained through the vanadium slag low-calcium roasting-carbonation leaching vanadium extraction technology serves as the raw material, ions such as iron, calcium and magnesium are controlled to enter the vanadium product through complexing, high-purity vanadium pentoxide with the low impurity content is obtained, the technological process is simple, implementation is easy, the cost is low, and the method is one of the methods for preparing high-purity vanadium pentoxide through the carbonation leaching solution.

The invention provides a method for preparing Bayer stone based on a high-alpha-k sodium aluminate solution, and belongs to the field of aluminum oxide preparation. The method comprises the following steps: adding a morphology regulating agent into a sodium aluminate solution with set alpha k to obtain a mixed solution; introducing a mixed gas with a set CO2 volume concentration into the mixed solution to perform a carbonation reaction under a set condition, and obtaining Bayer stone slurry when a reaction system of the carbonation reaction reaches a set NK concentration; and carrying out solid-liquid separation on the Bayer stone slurry to obtain the Bayer stone. The method comprises the following steps: firstly, adding a morphological regulating agent into a sodium aluminate solution to regulate the growth process and morphological characteristics of crystals so as to reduce crystal defects and impurity content; secondly, the carbonation reaction rate and the product composition are controlled by controlling the carbonation reaction conditions; and finally, by accurately controlling the end-point caustic alkali concentration, the mixing of impurities in the forming process of the Bayer stone can be reduced, so that a high-purity Bayer stone product is obtained.

The invention provides compositions and methods directed to carbonation of a cement mix during mixing. The carbonation may be controlled by one or more feedback mechanisms to adjust carbon dioxide delivery based on one or more characteristics of the mix or other aspects of the mixing operation.

The invention relates, inter alia, to a method for filling a liquid into a container. The method comprises carbonating the liquid using a carbonator. The method comprises continuously reducing a pressure of the carbonated liquid to below a saturation pressure of carbon dioxide in the carbonated liquid and to above or substantially equal to an ambient pressure using a filling valve. The method further comprises filling the container with the pressure-reduced liquid using the filling valve.

The invention belongs to the technical field of solid waste resource utilization, and relates to a method and system for preparing vaterite type calcium carbonate from waste incineration fly ash. The method comprises the following steps: by taking ammonium chloride as a leaching agent, leaching the waste incineration fly ash in a leaching agent solution, and then carrying out solid-liquid separation to obtain a calcium solution; and carrying out carbonation reaction on the calcium solution, an alkaline compound, sodium dodecyl benzene sulfonate and carbon dioxide under the conditions that the pressure intensity is 0.5-0.7 MPa and the temperature is 25-180 DEG C for 60-90 minutes to obtain the calcium carbonate. According to the method, high-quality vaterite type calcium carbonate can be prepared at a high conversion rate, the risk of fly ash is reduced, and mineralization of carbon dioxide is realized, so that waste is treated by waste, and green production is realized.

Systems and methods for direct air capture of carbon dioxide or other gases utilize a calcium sorbent in a manner that allows for wide scale, relatively low cost implementation. In particular, a calcium sorbent may be provided as a substantially thin coating on one or more substrates and utilized for direct air capture of carbon dioxide through chemisorption. The carbonated sorbent may be disposed of for sequestration of the carbon dioxide or regenerated with capture of carbon dioxide released from the carbonated sorbent during the regeneration process.

The invention relates to the technical field of industrial control, and discloses a soda water production line intelligent control method and system based on the Internet of Things, and the method comprises the steps: obtaining a backpressure valve reference pressure value according to the obtained real-time dynamic data through employing a pre-constructed carbonation digital twin model, and calculating the backpressure valve reference pressure value according to the backpressure valve reference pressure value; the carbonation digital twinning model is set to obtain a theoretical pressure value by adopting the Henry law according to the target gas content and the real-time data of the mixed liquid temperature, and obtain a predicted pressure value by adopting the pre-constructed pressure prediction model according to the target gas content, the real-time data of the raw material liquid injection flow and the real-time data of the carbon dioxide injection flow; further obtaining a reference pressure value of the back pressure valve; according to a first difference value between the target gas content and the real-time gas content of the mixed liquid, a first feedback correction algorithm is adopted to correct the reference pressure value of the back pressure valve, and a dynamic pressure control instruction of the back pressure valve is obtained; and controlling the back pressure valve to execute the back pressure valve dynamic pressure control instruction. According to the method, the taste stability of the soda water is effectively improved.

The invention discloses an energy system and method for coupling calcium-based thermochemical heat storage and carbon capture. The energy system comprises a calcination unit, a carbon dioxide pretreatment storage unit, a calcium oxide heat exchange storage unit, a carbonation reaction unit and a heat utilization unit which are arranged based on a boiler. The calcining unit takes green valley electricity as energy to drive calcining reaction to realize heat storage, and generated CaO is processed by the calcium oxide heat exchange storage unit and then is stored for use in a heat release stage; generated COs are stored for standby application after passing through the carbon dioxide pretreatment storage unit; in the heat release stage, CaO and the desulfurized flue gas are subjected to heat release carbonation reaction in the carbonation reaction unit, and heat is released; caCO3 generated by the carbonation reaction can be used for the next heat storage stage; and the heat released by the carbonation reaction is conveyed to the heat utilization unit for heat exchange. Through coupling of calcium-based thermochemical heat storage and carbon capture, green electricity and off-peak electricity are fully utilized, and efficient storage and gradient utilization of energy are achieved.

The invention discloses a calcium-based carbon capture-conversion integrated method based on NaAlO2 stable catalysis, and relates to the technical field of carbon dioxide capture and conversion, the specific method comprises the following steps: CaO and NaAlO2 are introduced into a carbonation reactor, CO2-containing flue gas is absorbed to generate CaCO3, NaAlO2 plays a role in inhibiting CaO sintering, so that the carbonation reaction is more stable; then the generated CaCO3 and NaAlO2 are transferred into a conversion reactor, charcoal is added for an in-situ conversion reaction, high-concentration CO gas and CaO are obtained, NaAlO2 serves as a catalyst, and charcoal serves as a reducing agent; and the generated CaO material enters the carbonation reactor again for cyclic utilization. According to the method, CO2 in the flue gas is converted into CO in situ, and emission reduction and utilization of CO2 are promoted.

The invention discloses a coupling carbon capture marine hydrogen fuel cell thermoelectric system and a use method thereof. The coupling carbon capture marine hydrogen fuel cell thermoelectric system comprises a methanol autothermal reforming hydrogen production system, a proton exchange membrane fuel stack power generation system and a carbon capture system, the methanol self-heating reforming hydrogen production system comprises a methanol storage tank, a water storage tank, a mixer A, a heat exchanger A, a methanol reforming reactor, a self-heating reactor and a hydrogen purification module; the proton exchange membrane fuel stack power generation system comprises a heat exchanger B, a proton exchange membrane fuel cell stack, a mixer B, a heat exchanger C, an air blower and a combustion chamber; the carbon capture system comprises a mixer C, a carbonation reactor, a calcination reactor, a compressor and a carbon dioxide storage tank. According to the invention, a methanol reforming hydrogen production technology, a proton exchange membrane fuel cell and a carbon capture technology are combined, so that production and consumption of hydrogen are matched, CO2 in ship tail gas is captured, and the fuel cell system based on methanol reforming hydrogen production realizes zero carbon emission and high-efficiency energy utilization.

The invention belongs to the technical field of dangerous solid waste resource utilization, and relates to a method and a system for washing, decontaminating and preserving calcium of fly ash through carbonation coupling ultrasonic two-stage pretreatment. The method comprises the following steps: exposing fly ash in air to carry out natural carbonation pretreatment until the pH value of the fly ash is not higher than 9 to obtain a pretreated product; mixing the pretreated product with an NH4HSO4 solution, carrying out ultrasonic pretreatment, and then stirring and washing with water; according to the method, deep dechlorination of the fly ash is achieved, the problem that heavy metal leaching exceeds the standard is effectively solved, the Ca component in the fly ash is reserved to a great extent, and the dual purposes of effective pollution control and efficient resource reservation are achieved.

A carbonation device for beverages includes a carbonation tank to receive a beverage to be carbonated and carbon dioxide so as to generate a carbonated beverage, carbonated with the carbon dioxide, and a dispensing device in fluid communication with the carbonation tank to dispense, through a duct, the carbonated beverage to a container for carbonated beverages, the carbonated beverage flowing along the duct in a flow direction.The carbonation device further includes a carbonation sensor associated with the duct and having a radiation source to generate a radiation which strikes the duct along an irradiation direction incident to the flow direction.The carbonation sensor also includes a first photodiode placed on the irradiation direction from a side opposite to the radiation source with respect to the duct, or as an alternative, a second photodiode placed along a diffusion direction substantially orthogonal to the irradiation direction.

The invention discloses a steel slag carbon sequestration reaction device, and belongs to the technical field of reaction devices. The device comprises a reactor which is internally provided with a heating part, a partition plate and a water storage disc, is externally connected with a gas supply bottle and a steam generator, and realizes parameter regulation and control through a controller. During working, steel slag is placed on the partition gauze, the heating part is heated, CO2 is introduced into the gas bottle, the steam generator and the water storage disc provide steam, the driving unit drives the partition and the water storage disc to swing, and gas-solid contact is strengthened; the water storage tank, the sealing cylinder and the like form a water circulation system to automatically supplement and return water; and the pressure release valve guarantees safety. Through the synergistic effect of temperature, humidity and mechanical swing, the carbonation reaction efficiency of the steel slag and CO2 is improved, and automatic operation of steel slag carbon sequestration is achieved. The device has the advantages that mass transfer is enhanced through mechanical swing, energy is saved through closed water circulation, steel slag is prevented from falling off through gauze design, waste is treated with waste, and high efficiency and environment friendliness are achieved.

The disclosure herein sets forth processes and compositions for producing carbonated materials comprising calcium carbonates through a mechanochemical process. The present disclosure concerns the production of calcium carbonate by sequestrating CO2. Certain processes herein include providing alkaline-rich mineral materials that include carbonatable solid wastes such as lime kiln dust, cement kiln dust, and coal combustion residues, and simultaneously fractioning the alkaline-rich mineral materials, while contacting the alkaline-rich mineral materials with a CO2-containing gas in carbonation reactor at low temperature and ambient pressure. In some embodiments, the alkaline-rich mineral materials are partially carbonated before being used in the processes disclosed herein. After contacting the alkaline-rich mineral materials with a CO2-containing gas in carbonation reactor at low temperature and ambient pressure, solid calcium carbonate is produced. In aqueous reactors, the solid calcium carbonate is filtered from a solution in which it precipitated, and the remaining solution includes hydroxide as well as alkaline metal ions. The solution filtered from the solid calcium carbonate can be sequentially contacted with a CO2-containing gas stream to precipitate additional calcium carbonate. The carbonated materials formed from these processes can be used in the form of a slurry, as a moist powder, as a dried powder, as a reactive filler or as a supplementary cementitious material in a mixture that is used to make concrete.

The present invention relates to a method of producing a carbonated composite:a. providing a particulate mineral material, wherein the mineral material comprises metal slag, wherein the metal slag comprises steel slag;b. providing a modifier, wherein the modifier comprises sodium gluconate;c. mixing the mineral material and the modifier with water to form a slurry;d. treating the slurry with carbon dioxide, to form a wet solid residue, wherein the concentration of carbon dioxide is greater than about 10 vol%; ande. drying the wet solid residue to form the carbonated composite.

The invention relates to a method for recovering lithium and fluorine from aluminum electrolysis hazardous waste, which comprises the following steps: firstly, mixing organic polyol and alkaline hydroxide according to a molar ratio of 1: (0.5-2) to obtain a eutectic solvent; heating the eutectic solvent to 80-150 DEG C, and adding a proper amount of raw material fine powder and calcium oxide for reaction leaching; carbonating and filtering the leachate to obtain lithium carbonate; washing the leaching residues with an acetic acid solution to obtain a calcium fluoride product; the concentration of fluorine ions in the leachate is smaller than or equal to 200 ppm, and the purity of calcium fluoride is larger than or equal to 90%; the leaching rate of lithium in the method is greater than 85%; the slag feeding rate of fluorine is greater than 95%; and no hydrogen fluoride gas is generated in the method. According to the method, a non-toxic and biodegradable eutectic solvent is adopted as a leaching agent, and efficient leaching of lithium and fluorine in the aluminum electrolysis dangerous waste materials is achieved; calcium oxide is used as a precipitating agent, free fluorine is promoted to be precipitated and recycled as calcium fluoride, the whole process meets the requirement of green metallurgy, and the win-win situation of resources and the environment is achieved.

The invention provides a device and method for directly mineralizing carbon dioxide in air by using industrial solid waste carbide slag, the device comprises a raw material closed-loop crushing and weighing system and a main reactor system, the raw material closed-loop crushing and weighing system is used for controlling the fineness of crushed carbide slag to be that the mass of particles with the particle size smaller than 2 mm accounts for 90%-100% of the total mass; the main reactor system comprises a bubbling bed mineralization reactor, a riser mineralization reactor and a gas-solid parallel flow downer mineralization reactor which are connected in sequence. The raw material crushing and screening system controls the granularity of the carbide slag to be-2mm, the content of the carbide slag is 90-100 wt%, then the carbide slag is fed into the main reactor system, the main reactor system works cooperatively, the bubbling bed completes pre-carbonation of alkaline substances on the surface layer and the shallow layer of the carbide slag, and the riser and downer coupling system further carbonates an intermediate product. And finally, efficient mineralization of the carbide slag is achieved, the mineralization rate is high, the conversion rate is high, the product granularity is stable, system adjustment is intelligent, CO2 emission can be effectively reduced, and resource utilization of industrial solid waste is promoted.

A method may include: introducing a resin modified cement slurry into a wellbore penetrating a subterranean formation, the subterranean formation comprising a caprock and a carbon dioxide injection zone, the resin modified cement slurry comprising: a resin; a hardener, a hydraulic cement; and water; and setting the resin modified cement slurry to form a set cement wherein the set cement forms a carbonation-resistant barrier in the carbon dioxide injection zone in the subterranean formation.

The invention relates to a method and a system for washing, dechlorinating and protecting calcium of fly ash based on carbonation pretreatment, and belongs to the technical field of resource utilization of dangerous solid wastes. The method comprises the following steps: exposing fly ash with the water content of 10-20% in air to carry out natural carbonation pretreatment, so that the pH value of the fly ash is not higher than 9; and washing the fly ash subjected to natural carbonation pretreatment by adopting a citric acid solution. According to the method provided by the invention, the defects of traditional water washing are overcome, the Ca-based component in the fly ash can be retained while the chlorine reaches the standard, and the mass loss caused in the fly ash elution process is reduced to a certain extent, so that the resource property of the fly ash is well retained, and the resource utilization value of the fly ash is improved.

The invention provides a power generation system and method based on carbonation calcination cycle coupling thermochemical energy storage. The power generation system comprises a carbonate calcination reactor, a COturbine power generation unit, a carbonation reactor, a thermochemical energy storage unit, a heat exchange network and a control system. According to the invention, industrial waste heat or renewable energy electric power is utilized to drive carbonate calcination to generate high-temperature COs to push the turbine to generate power; meanwhile, a calcined product CaO / MgO enters a carbonation reactor to absorb COO in smoke or the atmosphere, carbon sequestration circulation is completed, high-temperature heat needed by calcination is supplied by high-grade heat energy stored by a thermochemical energy storage unit in the charging stage, and the heat energy comes from surplus electric power or system power generation tail gas waste heat; the thermochemical energy storage unit releases heat to drive calcination in the discharging stage, and power grid peak regulation and energy time shifting are achieved. The problems of intermittency and carbon emission of traditional thermal power / wind and light power generation are solved, and integration of efficient, low-carbon and schedulable power output and carbon capture is achieved.

The invention discloses a method for preparing high aspect ratio calcium carbonate whiskers by carbon fixation in steel smelting slag leachate, belonging to the technical field of solid waste resource utilization. The method comprises the following steps: leaching steel smelting slag to obtain calcium-magnesium leachate and leach slag; removing impurities from the calcium-magnesium leachate by a pH swing method to obtain a calcium-magnesium purified solution; capturing the gas containing carbon dioxide by an alkaline solution to obtain a carbonated solution; adjusting the pH of the calcium-magnesium purified solution to convert magnesium ions into magnesium hydroxide, placing the solution in an ultrasonic field, adding the carbonated solution to carry out a carbon fixation reaction, and washing and drying the precipitate obtained by the reaction to obtain calcium carbonate whiskers. The method not only successfully realizes the efficient resource utilization of two wastes, steel smelting slag and carbon dioxide flue gas, but also produces high value-added calcium carbonate whisker products while stably fixing carbon dioxide, and has broad application prospects and environmental value.

The thermal chemical heat storage and carbon capture system comprises a coal-fired boiler, a calcination reactor and a carbonation reactor, the calcination reactor extracts high-temperature flue gas from the front wall of a hearth of the coal-fired boiler, the high-temperature flue gas drives CaCO3 in the calcination reactor to be decomposed into CaO and CO2, and heat storage is achieved; the reacted flue gas is pumped back into a tail flue of the coal-fired boiler, and the flue gas flow required by the reaction is controlled through a flow control valve on a pumping pipeline; caO generated by the calcination reaction can enter the carbonation reactor in the heat release stage, a heat release carbonation reaction is carried out, heat is released, CaCO3 obtained after the heat release reaction returns to the calcination reactor through a pipeline to serve as a reaction raw material, and CO2 obtained after the heat release reaction is output to a heat supply system. The integration of heat storage, heat release and carbon capture is realized by utilizing calcium-based material circulation, and the peak regulation capacity and the carbon capture economy of the coal-fired unit are remarkably improved.

The present invention relates to hazardous waste treatment technology, and aims to provide a method and system for efficient detoxification, quality improvement and reuse of fly ash from garbage incineration. The method utilizes a stirred ball mill reactor, a secondary water washing unit, a tertiary water washing unit and a fired-free brick preparation unit arranged in sequence, and couples a wet mechanochemical method with a carbonation, multi-stage water washing and fired-free pressing treatment process to achieve detoxification, quality improvement and reuse of fly ash from garbage incineration; before the flue gas is introduced to start the carbonation reaction, the fly ash is first subjected to a wet mechanical ball milling pretreatment, and a heavy metal composite stabilizer is added according to the characteristics of the reaction system, so that phosphate and tris-mercapto-s-triazine trisodium salt react with heavy metals respectively to stabilize the heavy metals in the solid phase medium. The present invention can improve the ability of fly ash to seal carbon dioxide, and the hardness of the obtained water washing liquid is lower than , and the heavy metal content is extremely low, which reduces the cost of the existing evaporation crystallization process; the risk of heavy metal leaching is low, the fly ash dechlorination efficiency is high, and the mechanical properties of the prepared fired-free bricks are better than those of the prior art.

The invention relates to the technical field of building materials, in particular to a carbon sequestration concrete solid brick prepared from coal-based solid waste and a preparation method of the carbon sequestration concrete solid brick. The carbon sequestration concrete solid brick is prepared from the following raw materials in parts by weight: 20 to 30 parts of fly ash, 65 to 75 parts of furnace bottom slag and 5 parts of cement, wherein the fly ash is secondary ash, the particle size of the furnace bottom slag is smaller than or equal to 4.75 mm, and the mark number of the cement is P.O 42.5. The method comprises the following steps: firstly, enabling carbon dioxide to react with alkaline components such as dicalcium silicate in the fly ash to form carbonate so as to realize effective carbon sequestration; and then through secondary mineralization maintenance, carbon dioxide, active components such as calcium and magnesium in the cement and dicalcium silicate which is not completely reacted in the fly ash are subjected to carbonation reaction, so that a product layer filling effect is realized. According to the invention, the building material with good carbon sequestration performance and excellent mechanical properties is prepared by utilizing industrial solid waste and carbon dioxide, so that energy conservation and emission reduction are realized, meanwhile, greenhouse gas emission is reduced, and the performance of the building solid waste brick is enhanced.

The invention relates to the technical field of preparation of light calcium carbonate, and particularly discloses a preparation process of light calcium carbonate with high settling volume. According to the preparation process of the light calcium carbonate, the calcium carbonate slurry prepared under specific process conditions is used as a seed crystal, the ammonium chloride leaching solution of the calcium-containing industrial waste residues is used as a raw material, the light calcium carbonate product with the high sedimentation volume (2.4 mL / g-6. 5mL / g) is prepared through the carbonation reaction, the process is simple, convenient and easy to implement, the cost is low, and the method is suitable for industrial production. The application field and the additional value of the light calcium carbonate product prepared by taking the calcium-containing industrial waste residue as the raw material are remarkably improved, the high-end market demand is met, and the method has relatively high popularization and application values.

The invention relates to the technical field of aluminum oxide preparation, in particular to a method for preparing flaky aluminum oxide by using electrolyte waste liquid and flaky aluminum oxide. The method comprises the following steps: carrying out carbonation reaction on the electrolyte waste liquid by using carbon dioxide to obtain aluminum hydroxide precipitate; washing the aluminum hydroxide precipitate for the first time by using a washing agent to obtain a washed aluminum hydroxide solid-phase substance with a preset sodium content; calcining the washed aluminum hydroxide solid-phase substance to obtain a gamma-type aluminum oxide precursor; carrying out molten salt reaction on the composite molten salt system and the gamma-type aluminum oxide precursor to obtain a flaky aluminum oxide crude product; wherein the composite molten salt system is a mixture of sodium chloride, potassium chloride and sodium sulfate; and carrying out secondary washing on the sheet-shaped aluminum oxide crude product to obtain a sheet-shaped aluminum oxide product. According to the method, the flaky alumina with the high radius-thickness ratio is prepared under fluoride-free and strong acid conditions through a three-step core strategy of resource utilization of waste electrolyte, accurate sodium content control and directional induction of composite molten salt.

The invention provides a method for preparing high-purity vanadium pentoxide from carbonation leachate. The method comprises the following steps: S1, adding aluminum salt into the carbonation leachate to remove silicon, and carrying out solid-liquid separation to obtain silicon-removed liquid; s2, mixing the silicon-removed liquid with ammonium salt, and performing solid-liquid separation after vanadium precipitation to obtain crude ammonium metavanadate; s3, re-dissolving the coarse ammonium metavanadate, carrying out stirring reaction on the obtained coarse ammonium metavanadate re-dissolved slurry, and carrying out solid-liquid separation to obtain an ammonium metavanadate solution; s4, a complexing agent and ammonium salt are added into the ammonium metavanadate solution for vanadium precipitation, and high-purity ammonium metavanadate is obtained after solid-liquid separation; and S5, carrying out high-temperature calcination on the high-purity ammonium metavanadate to obtain the high-purity vanadium pentoxide. According to the method provided by the invention, the high-purity vanadium pentoxide with low impurity content is obtained by adopting the technological means of deeply removing silicon, re-dissolving to remove iron and separating cations such as calcium, potassium, sodium and the like into the vanadium product through complexing crystallization, and the method is simple in technological process, low in auxiliary material consumption and relatively low in cost.

The invention relates to a method for full utilization of steel slag, in particular to a method for preparing high-stability compact stone by using steel slag and recovering waste heat. The method mainly comprises the processes of molten steel slag compactness regulation and control, thermal crushing, pressure steam carbonation and recovery of part of sensible heat of the steel slag. The obtained steel slag product can replace natural stones to be used for traffic infrastructure construction. Converter steelmaking final slag is pretreated through molten steel slag solidification regulation and pressure steam carbonation, compact steel slag particles are obtained through combination of a specific air inlet system and rolling crushing, then calcium and magnesium minerals are utilized to rapidly fix carbon dioxide and stabilize volume expansion elements at a high temperature, all steel slag resources are made into stone, and the steel slag resource utilization rate is increased. Meanwhile, part of sensible heat of the full-temperature-section steel slag is recovered. The steel slag stone with a stable and compact surface can be obtained after the treatment of the method. An efficient and value-added treatment mode is provided for large-scale absorption of the steel slag, and the method can be widely applied to high-temperature steel slag treatment in the metallurgical industry.