15results about "Iron compounds preparation" patented technology

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 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.

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.

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).

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 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.