29results about "Iron compounds preparation" patented technology

The invention discloses a method for recovering Mo and Fe from direct coal liquefaction oil residues, and belongs to the technical field of hydrometallurgy. The method comprises the steps of solvent extraction, roasting enrichment, wet leaching, extracting agent extraction, ammonia water reverse extraction and evaporative crystallization, and ammonium molybdate and Fe (OH) 3 are obtained. Wherein in the wet leaching process, a leaching aid and sulfuric acid are jointly used for leaching, so that Ca and Si in the oil residues are left in leaching residues, and Mo, Fe, Al and the like enter a solution. The method comprises the following steps: simultaneously extracting Mo and Fe from a solution by using an extracting agent, precipitating Fe in a Fe (OH) 3 state by using an ammonia water reverse extraction method, leaving Mo in a reverse extraction solution in the form of ammonium molybdate, and further evaporating and crystallizing the reverse extraction solution to obtain the ammonium molybdate. According to the method, two valuable metals Mo and Fe in the direct coal liquefaction oil residue can be effectively recovered, and resource recycling is facilitated.

The present application relates to a kind of methods for removing aluminum from iron-containing aluminum feed liquid, and the present application relates to the field of hydrometallurgy, the method comprises: using saponifier saponification extractant, the saponifier is alkaline solution;Using saponified extractant to remove aluminum from the iron-containing aluminum feed liquid, control extraction equilibrium pH value is 0.5-3, obtain the raffinate removed aluminum and the aluminum extractant loaded;Aluminum-loaded extractant is sequentially washed and stripped, to obtain the extractant after stripping.The method of the present application has high aluminum extraction efficiency, so that iron and impurities such as aluminum are well separated.

A process for preparing a compound of formula (NaOH)x[Fe(OH)2]yFeS, may include: (a) mixing iron and sodium sulfide in equimolar amounts, in an NaOH aqueous solution; (b) heating the obtained mixture up to a temperature in a range of from 110 to 210° C. for a duration in a range of from 1 hour to 1 week; and (c) recovering the active material by filtering and drying in a neutral atmosphere.

The invention relates to the field of preparation of calcium hydrophosphate, and discloses a method for producing feed-grade calcium hydrophosphate by a hydrochloric acid method, which comprises the following steps: acidolysis: decomposing ground phosphate rock by hydrochloric acid to obtain acidolysis liquid; secondary iron extraction: adding an extracting agent into the acidolysis solution, and performing secondary counter-current extraction to obtain iron-removed phosphoric acid liquid; secondary extraction: adding an extracting agent into the iron-removed phosphoric acid solution, and carrying out secondary counter-current extraction to obtain organic-phase loaded phosphoric acid and water-phase raffinate; washing is performed; reverse extraction; carrying out neutralization reaction; and drying. The amount of acid added in the acidolysis process is 1.1 times of the theoretical amount, the acid fully reacts with the phosphorite, less acid sludge is generated, and the utilization rate of the phosphorite is high. Meanwhile, an iron resource in the phosphorite can be recycled and converted into ferric trichloride which can be sold as a byproduct, so that the economic benefit is improved, and the environment is protected. The process can reduce the use of calcium carbonate, reduce the emission of carbon dioxide and save the medicament cost; compared with the original process, the total yield is increased from 60% to 70%, and the product quality is higher.

A sodium iron hydroxysulfide compound, a method for making the compound, an active material containing the compound, and an electrochemical electrode made from the active material. x [Fe(OH)2] y A method for producing a compound of FeS, said method comprising the following steps: a. mixing equimolar amounts of iron and sodium sulfide in an aqueous NaOH solution, b. heating the mixture obtained to a temperature comprised between 110°C and 210°C for a period comprised between 1 hour and 1 week, c. recovering the active material by filtration and drying in a neutral atmosphere.

The present disclosure provides a method for separating iron element in brine and application thereof. The method for separating iron element in brine comprises: adding a pH adjusting agent to brine, to adjust pH of the brine to 6.0-7.0, and controlling the temperature of the brine to 75° C.-90° C.; introducing an oxygen-containing gas into the brine, to covert the iron element in the brine into magnetic iron oxide; and separating the magnetic iron oxide from the brine by magnetic adsorption to obtain an iron-removed brine.

The invention discloses a preparation method of amorphous iron oxide microspheres for a lithium battery, and relates to the technical field of battery materials, the preparation method comprises the following steps: using ferrous sulfate, liquid ammonia and liquid oxygen as raw materials to produce an iron oxide product which has high purity and high activity and is suitable for manufacturing a lithium iron phosphate battery, and simultaneously co-producing high-quality ammonium sulfate; the method comprises the following steps: (1) purifying ferrous sulfate, namely preparing ferrous sulfate heptahydrate and water into a solution, heating and stirring, adding ammonium sulfide and ammonia water to adjust the pH value of the solution, filtering, removing heavy metal ions, cooling and crystallizing to obtain ferrous sulfate crystals, and dissolving the crystals with pure water to obtain a pure ferrous sulfate solution; (2) preparing a seed crystal; (3) carrying out oxidation crystal growth and composite dephosphorization; and (4) filtering, washing, drying and crushing. According to the technical scheme, the problems that the iron oxide produced by the existing method for producing the iron oxide for the lithium battery has many impurities, the product percent of pass is uncontrollable, and the production efficiency is low are solved.

A system and method for separating Y and Sr is provided. The system and method provide a combination of a solution, a container, and / or a medium that can provide a Y solution of an industrially advantageous concentration.

The method for chemically treating sewage sludge ash comprises dissolving starting material originating from sewage sludge ash in an acid comprising hydrochloric acid (S10). The starting material comprises at least silicon and iron compounds. The undissolved residue is separated (S12), thereby leaving a leachate. The amount of colloidal silica in the dissolved sewage sludge ash is controlled (S15). At least one of iron and phosphorus is extracted from the leachate by liquid-liquid extraction with an organic solvent (20). At least a portion of the raffinate resulting from the iron and phosphorus extraction step, from which at least one of iron and phosphorus has been at least partially removed, is recycled (S90) for dissolving the starting material originating from sewage sludge ash. The recycled portion of the raffinate from which at least one of iron and phosphorus has been at least partially removed comprises chloride ions. A composition for chemically treating sewage sludge ash is also disclosed.

A method for chemically treating sewage sludge ash includes dissolving (S10) a starting material derived from sewage sludge ash in an acid comprising hydrochloric acid. The starting material comprises at least silicon and iron compounds. A non-dissolved residue is separated (S12), thereby retaining a leachate. An amount of colloidal silicon dioxide in the dissolved sewage sludge ash is controlled (S15). At least one of iron and phosphorus is extracted (20) from the leachate by liquid-liquid extraction with an organic solvent. At least a portion of a raffinate at least partially depleted in at least one of iron and phosphorus resulting from the step of extracting at least one of iron and phosphorus is recycled (S90) for dissolving the starting material derived from sewage sludge ash. The recycled portion of the raffinate at least partially depleted in at least one of iron and phosphorus comprises chloride ions. An apparatus for chemically treating sewage sludge ash is also disclosed.

A method for chemical processing of sewage sludge ash comprises dissolving (S10) a start material, emanating from sewage sludge ash, in an acid comprising hydrochloric acid. The start material comprising at least silicon and iron compounds. Undissolved residues are separated (S12), whereby a leachate remains. The amount of colloidal silica in the dissolved sewage sludge ash is controlled (S15). At least one of iron and phosphorus is extracted (20) from the leachate by liquid-liquid extraction with an organic solvent. At least a part of a raffinate at least partly depleted in at least one of iron and phosphorus originating from the step of extracting at least one of iron and phosphorus is recirculated (S90) for dissolving the start material, emanating from sewage sludge ash. The recirculated part of the raffinate at least partly depleted in at least one of iron and phosphorus comprises chloride ions. An arrangement for chemical processing of sewage sludge ash is also disclosed.

The invention relates to a method for recovering metal cations from an extraction agent loaded with the metal cations, and belongs to the technical field of wet-process phosphoric acid. The technical problem to be solved by the invention is to provide a method for recovering metal cations from an extraction agent loaded with metal cations. The method comprises the process steps of reverse extraction, circulating enrichment, metal ion recovery, washing and the like, and metal cations are recovered from an extraction agent loaded with the metal cations. According to the method, a single mixed stripping agent is adopted, circulating enrichment is combined, ammonia gas is introduced to adjust pH to precipitate the metal ions, the process is relatively simple, the metal ions can be effectively recycled, an external precipitator does not need to be introduced, efficient separation and recycling of the metal ions can be achieved, the stripping rate and the recycling rate are increased, meanwhile, energy consumption is reduced, and the product purity breaks through the battery grade standard; the limitation of a one-time reverse extraction process is thoroughly solved, and wet-process phosphoric acid metal recovery is promoted to be upgraded to the efficient and green direction.

The present invention relates to a method of preparing an iron-chromium oxide using an ion-exchange resin. Moreover, the present invention relates to a method of preparing an iron-chromium oxide that can be used as a cathode material for lithium-ion batteries. According to one aspect of the present invention, it has the effect of providing a cathode material for lithium-ion batteries with a high capacitance, while exhibiting a voltage similar to that of a transition-metal oxide (2-4.5 V vs Li+ / Li).

The application provides a method for separating and recovering iron from an iron-containing lithium ore acid leaching solution, and relates to the field of hydrometallurgy. The method comprises the following steps: mixing the iron-containing lithium ore acid leaching solution with an oxidizing agent to perform a reaction, and then adding an acidity regulator to adjust the solution acidity to a target value; using an iron selective extractant to perform extraction on the solution to obtain an extraction loaded organic phase and a raffinate, the raffinate is used to prepare lithium carbonate after impurity removal; the extraction loaded organic phase is washed and then subjected to back extraction to obtain a back extraction solution; the back extraction solution is mixed with a neutralizing agent to obtain an iron salt slurry, and an iron salt solution is obtained after solid-liquid separation. The method comprehensively recovers iron in the lithium ore acid leaching solution, does not introduce impurity ions, has low lithium loss rate of the solution, can realize waste utilization, reduces waste residue discharge, and has the advantages of simple process, stable operation, and suitability for industrial scale production.

The invention discloses a method for recovering rare earth and other valuable elements from solid waste and a complete system thereof. The method sequentially comprises the six steps of pretreatment-phase change enrichment, selective leaching, multi-stage solvent extraction, fractional precipitation and sintering, product refining and residue harmlessness, and according to the separation sequence of precious metal, rare earth, high-melting-point metal and basic metal, Nd, Pr, Dy, Ti, Zr, Sc, Fe, Au, Pd and other elements can be efficiently recycled in the same process. The treatment cost is obviously reduced; and secondary wastes are reduced. Through performance verification, the overall recovery rate of rare earth is not less than 95%, the recovery rate of precious metals is not less than 98%, and the recovery rate of matrix metals such as iron, titanium, zirconium and scandium is not less than 90%. The method disclosed by the invention is wide in applicable objects including waste magnets, electronic wastes, metallurgical slag, tailings and the like, realizes high-valued and clean production of resources, and provides a new way for green and sustainable utilization of rare earth resources.

A step-by-step extraction and comprehensive utilization process for mixed rare earth ore concentrate belongs to the field of hydrometallurgy and comprises the following steps: oxidizing roasting of the mixed rare earth ore concentrate, hydrochloric acid leaching, low-alkalinity alkali conversion water washing defluorination, sodium fluoride solution pretreatment, membrane separation purification and crystal form calcium fluoride preparation. Dissolving the converted rare earth hydroxide with hydrochloric acid, and enriching monazite; drying the monazite concentrate, roasting with double alkalis, and dephosphorizing; recycling trisodium phosphate dodecahydrate through temperature difference dissolution crystallization; rare earth and thorium are dissolved at high acidity, ferric iron in feed liquid is removed through N235 extraction, a ferric chloride solution is obtained through clean water reverse extraction, and after iron is removed from high-thorium rare earth feed liquid, value adjustment is conducted, and thorium enrichment is separated through hydrolysis. According to the method disclosed by the invention, an alkali transfer defluorination water purification and high-quality calcium fluoride preparation technology, a sodium phosphate recovery technology, a feed liquid iron removal technology and a thorium enrichment process are utilized, and multiple technologies are optimized and combined, so that multiple associated resources are efficiently separated, enriched and productized step by step, and meanwhile, the rare earth yield reaches an unprecedented height; and the rare earth yield of the mixed rare earth concentrate is greater than 99%.

A method for producing an iron chromium electrolyte, the method comprising leaching iron and chromium from a ferrochrome alloy using hydrochloric acid at an elevated leaching temperature. A crude iron chromium electrolyte comprising dissolved iron and dissolved chromium is produced. The crude electrolyte is purified and conditioned to produce a functional iron chromium electrolyte.

The invention discloses a metal oxide nano material, a surface modification method thereof and an array type gas sensor. The surface modification method comprises the following steps: quickly immersing a metal oxide nano material subjected to high-temperature heating treatment into a low-temperature transition metal salt solution for quenching treatment; crystal lattices on the surface or near the surface of the quenched metal oxide nano material are subjected to unbalanced reconstruction, and transition metal ions and crystal lattice defects of the transition metal salt solution are introduced. According to the present invention, by using the instantaneous temperature difference and the ion exchange reaction, the lattice reconstruction and the high-density defect introduction on the surface of the metal oxide nanometer material are achieved within the second-level time, such that the gas sensitive property of the material is significantly improved, the detection limit is as low as 2.7 ppb, and the response time is substantially shortened.

The present application relates to a method for recovering metal cations from wet-process phosphoric acid, and belongs to the technical field of wet-process phosphoric acid. The present application solves the technical problem of providing a method for recovering metal cations from wet-process phosphoric acid. The method comprises steps of extraction, washing 1, back extraction, recovery of metal ions and washing 2. The present application adopts a specific back extraction method to recover metal cations from wet-process phosphoric acid, various metal ions can be effectively separated, the recovery rate of each metal element is high, and the product value is high. And a kind of back extraction agent can classify and recover associated metal elements in wet-process phosphoric acid, the method is simple, the cost is relatively low, and the recovered associated metal elements can be effectively separated and high-quality utilization.

A process for producing an iron chromium electrolyte, the process includes leaching iron and chromium from a ferrochrome alloy at an elevated leaching temperature, using hydrochloric acid. A raw iron chromium electrolyte comprising dissolved iron and dissolved chromium is produced. The raw electrolyte is purified and adjusted to produce a functional iron chromium electrolyte.

Disclosed in the present invention are a FeSO4 electrolyte, and a preparation method therefor and a use thereof. The method for using iron ore to prepare a FeSO4 electrolyte comprises the following steps: crushing iron ore and grinding same to obtain ore powder; carrying out oxidation roasting on the ore powder at 550°C-750°C for 30 min-120 min to obtain roasted ore powder; carrying out acid leaching on the roasted ore powder and then carrying out filtration to obtain a first filtrate; adding iron powder to the filtrate to implement a reduction reaction, so as to reduce Fe3+ to Fe2+, and when the pH reaches 3-7, using a magnet to attract the iron powder to obtain a second filtrate; adding a heavy metal precipitant Na2S to the second filtrate to convert heavy metals into metal sulfide precipitates, and after the heavy metal precipitation reaction, adding a flocculant to carry out flocculation and precipitation, and then carrying out filtration to obtain a FeSO4 electrolyte.

The invention discloses a method for all-component separation, purification and high-value utilization of ammonium sulfate waste residues, which comprises the following steps: by using low-cost ammonium fluoride as a fluorine source, selectively precipitating Mg < 2 + > through one-step fluorination conversion, preparing high-purity MgF2, recovering valuable metals by combining an extraction-reverse extraction process, and preparing a manganese-magnesium ferrite material by combining sol-gel and high-temperature calcination processes. And recovering an ammonium sulfate by-product. Compared with an existing high-purity inorganic salt preparation process, high-value utilization of all-component resources in the waste residues is achieved, and the problems that waste residues are difficult to treat, cost is high and the like are solved. The method adopts a one-step fluorination conversion, extraction and reverse extraction process and a sol-gel method, and is low in cost, high in resource utilization rate, non-toxic and harmless. The prepared magnesium fluoride can be applied to the fields of optical materials and electronic ceramics; mnxMg (1-x) Fe2O4 has good magnetism and photocatalytic performance, so that organic pollutants can be degraded; the recovered ammonium sulfate can be directly used as a nitrogen fertilizer raw material, so that multi-component synergistic high-value utilization is realized.

The invention discloses a method for rapidly recovering phosphorus element in activated sludge, which utilizes an alkaline gradient centrifugation technology to realize selective separation of high-density substances on the basis of the characteristic that the density of an adsorbent for precipitating and adsorbing phosphate of metal phosphate is greater than that of the activated sludge. After the alkaline agent is dissolved, the pH is increased, calcium and magnesium ions in the sludge and phosphate radicals are promoted to form precipitates, meanwhile, the adsorption agent is hydrolyzed to capture the phosphate radicals, and the high-density substances can be separated from the light activated sludge under the action of centrifugal force. Compared with the prior art, the treatment time of the method is only minute-hour level, and the energy consumption and the secondary pollution are obviously reduced. Only high-density precipitates instead of all sludge are treated, so that the dosage of the medicament is reduced on year-on-year basis, and the gradient centrifugation medicament can be recycled and regenerated. Process parameters are flexible and adjustable, and the device can adapt to sludge with different water contents. The recovered phosphorus can be used as a phosphorus fertilizer precursor or used in the fields of fire retardant manufacturing and the like, efficient cyclic utilization of phosphorus resources is achieved, and economic and environment-friendly values are achieved.

The present invention relates to the technical field of the production of nanocomposites, and particularly to a purification method for inorganic nanoparticles modified with medium- and low-molecular-weight polyethylene glycol derivatives. The purification method for inorganic nanoparticles modified with medium- and low-molecular-weight polyethylene glycol derivatives provided by the present invention realizes high-purity purification through the combination and sequence of process steps including preparation of stock solution, alkane sedimentation, alkane washing, acid dissolution, extraction and phase separation with an ether solvent, and nanofiltration membrane separation. By purifying the inorganic nanoparticles modified with medium- and low-molecular-weight polyethylene glycol derivatives through the present invention, emulsification and aggregation of the inorganic nanoparticles in the nanofiltration membrane are effectively prevented, the use efficiency of the nanofiltration membrane equipment is improved, the corrosion of the nanofiltration membrane equipment by organic solvents is reduced, and at the same time, the obtained product has high purity, contains less free polyethylene glycol derivatives, has a concentrated hydrodynamic size distribution and good monodispersity, has high potential for industrial application, and can meet the requirements of large-scale production.

The invention relates to a method for preparing iron oxyhydroxides by addition of an aqueous iron salt solution (A) and an alkaline, aqueous precipitant solution (B) to an initial charge while maintaining a pH in the range of 6 to 10.

The application provides a method for separating iron elements in brine and application thereof, and the method for separating iron elements in brine comprises the following steps: adding a pH regulator into the brine, adjusting the pH value of the brine to 6.0-7.0, and controlling the temperature of the brine to be 75-90 DEG C; introducing oxygen-containing gas into the brine, so that the iron elements in the brine form magnetic iron oxide; and separating the magnetic iron oxide from the brine by using a magnetic separator to obtain iron-removed brine. The method can convert the iron elements in the brine into magnetic iron oxide, and then remove the iron elements from the brine by using a magnetic separation technology, so that the problem that iron ions in the brine interfere with the adsorption of lithium by an adsorbent is solved, and the iron-removed brine obtained by the method can be directly used for lithium extraction by an adsorption method, which is matched with the existing process conditions for lithium extraction from brine, and has good practicability.

The present disclosure provides a method for separating iron element in brine. A pH adjusting agent is added to brine, to adjust the brine to pH between 6.0 and 7.0, and the temperature of the brine is controlled to between 75°C and 90°C. An oxygen-containing gas is introduced into the brine, to covert the iron element in the brine into magnetic iron oxide. The magnetic iron oxide is separated from the brine by magnetic adsorption, to obtain an iron-removed brine. The brine includes geothermal brine.

A comprehensive recycling and utilization process for pollutants in high-aluminum coal flue gas purification, which adopts physical adsorption and chemical adsorption methods to remove SO2 from the flue gas; adopts oxidation + adsorption method to remove NOx from the flue gas; adopts water-soluble impregnation method to desorb two adsorbents; absorbs AL2O3\Fe2O3 in the smoke dust by mixing the desorption liquid with the flue gas and converts it into AL2(SO4)2\AL(NO3)3\Fe(NO3)3\AL(NO3)3; adopts step-by-step crystallization method to separate aluminum sulfate and ferric sulfate according to the difference in solubility of each component; decomposes aluminum sulfate and aluminum nitrate into aluminum hydroxide, ammonium sulfate and ammonium nitrate by ammonia double decomposition method; and re-absorbs and converts impurities discharged after extracting aluminum and iron in a high-speed stirring reactor by sodium hydroxide liquid phase fusion method, so that the silicon dioxide in the impurities is fused with the impurities and converted into sodium metasilicate, thereby completing the maximum recycling and utilization of fly ash.