12 results about "FERROUS CARBONATE" patented technology

The invention discloses a preparation method of a multi-element doped ferromanganese oxide positive electrode precursor, and belongs to the technical field of lithium ion battery positive electrode material preparation. The molar ratio of manganese to iron in the multi-element doped ferromanganese oxide positive electrode precursor is x: (1-x), 0.2 lt; xlt; and the doping element accounts for 0.1-10% of the total mole number of manganese and iron. According to the multi-element doped ferromanganese oxide positive electrode precursor prepared by the invention, the coprecipitation intermediates are manganese carbonate and ferrous carbonate, and Ksp of the manganese carbonate and the ferrous carbonate are relatively close, so that the uniformity of ferromanganese can be ensured, meanwhile, metal ion doping is carried out in a liquid phase synthesis precursor stage, and the probability that doped ions enter compound lattices is greatly improved. The multi-element doped ferromanganese oxide positive electrode precursor has relatively high stability and good conductivity, and is beneficial to improving the capacity, the cycle life and the compaction density of a lithium iron manganese phosphate positive electrode material.

The invention discloses a method for leaching zinc and separating germanium from zinc-neutralized germanium-containing slag containing zinc silicate, belonging to the industry of comprehensive utilization of secondary metal resources. The method uses zinc-neutralized germanium-containing slag containing zinc silicate as raw material, controls the introduction of an appropriate amount of ferrous carbonate, and adjusts the molar ratio of ferrous carbonate to zinc silicate to 1.0 - 3.0:1; then roasts in an oxidizing atmosphere to obtain a roasted product with reconstituted ore phase; finally, ammonia leaching method can be used to selectively leach zinc. The method for recovering zinc by ore phase reconstruction - ammonia leaching is adopted in the invention. After the decomposition of ferrous carbonate, it reacts with zinc silicate in an oxidizing atmosphere, and zinc silicate is well converted into zinc oxide. The leaching rate of zinc can reach over 92% after two-stage ammonia leaching, and germanium is enriched in the ammonia leaching residue as raw material for germanium extraction. The oxide after the decomposition of ferrous carbonate enters the slag without introducing new impurities, and can increase the iron content in the slag, which is beneficial to the resource utilization of iron. The invention is simple and controllable, has a high leaching rate of zinc and a good separation effect of germanium, and is convenient for large-scale industrial application.

The invention discloses a preparation method of ferrous L-threonate, and relates to the technical field of organic chemical synthesizing.The preparation method comprises the steps that vitamin C serves as a raw material and is oxidized through hydrogen peroxide to obtain threonic acid, residual hydrogen peroxide is removed through high temperature, and the threonic acid reacts with ferrous carbonate under the nitrogen protection condition to generate the ferrous L-threonate; and filtering and concentrating under reduced pressure to obtain a ferrous L-threonate crude product, and recrystallizing and purifying the crude product to obtain a ferrous L-threonate pure product. The process has the advantages of good process stability, high purity of pure products, cheap and easily available raw materials, simplicity in operation, high safety, environmental friendliness and the like.

The invention belongs to the technical field of ascorbic acid derivatives, and particularly relates to ferrous ascorbate as well as a preparation method and application thereof. The invention provides a preparation method of ferrous ascorbate, which comprises the following steps: mixing sodium ascorbate, ferrous sulfate and water, and carrying out double decomposition reaction to obtain reaction liquid; and mixing the reaction liquid with ethanol, and separating out the ferrous ascorbate. According to the preparation method provided by the invention, the yield of ferrous ascorbate is relatively high, the preparation method can be realized without too high temperature, and the reaction difficulty is remarkably reduced; meanwhile, the used synthesis raw materials are optimized, the defects that the raw material ferrous carbonate used in an existing method is unstable and difficult to store are overcome, ferrous sulfate is more convenient and practical, and the raw material obtaining difficulty is reduced.

The application discloses a preparation method of aluminum-doped and high-hydrated chromite monocrystal under high temperature and high pressure, and the method comprises the following steps: preparing a cylindrical chromite sample by taking solid triangular ferrous carbonate crystals, solid alkaline chromium acetate crystal powder, solid aluminum distearate powder, solid oxalic acid powder, solid alpha-phase goethite powder, solid aluminum hydroxide powder and liquid dilute nitric acid as starting raw materials; preparing two pieces of water source pieces by taking the alpha-phase goethite powder and the aluminum hydroxide powder in a weight ratio of 4:1; placing the two pieces of water source pieces at two ends of the cylindrical chromite sample and putting the sample into a double-capsule structure sample bin to perform a high-temperature and high-pressure reaction to obtain the chromite monocrystal; and the method solves the technical blank of the preparation of aluminum-doped and high-hydrated chromite large-grain monocrystal under high temperature and high pressure, so that the experimental sample of the aluminum-doped and high-hydrated chromite large-grain monocrystal can be obtained.

This application relates to the field of hydrometallurgical technology and discloses a method for treating red mud. The method includes: treating red mud with sulfuric acid solution to remove sodium, obtaining sodium sulfate washing solution and sodium-removed slag; performing a first-stage leaching treatment on the sodium-removed slag to obtain a first-stage leachate and a first-stage leaching residue; performing a second-stage leaching treatment on the first-stage leaching residue to obtain a second-stage leachate and a second-stage leaching residue, wherein the second-stage leaching residue includes iron-calcium slag; introducing sulfur dioxide into the first-stage leachate for reduction treatment to obtain a reduced solution; reacting the reduced solution with ferrous carbonate for titanium precipitation treatment to obtain a titanium-precipitated solution and titanium slag; reacting ammonia water with the titanium-precipitated solution for aluminum precipitation treatment to obtain an aluminum-precipitated solution and aluminum hydroxide slag; and introducing oxygen into the aluminum-precipitated solution for iron precipitation treatment to obtain hematite slag and an iron-precipitated solution. This method achieves efficient recovery of resources from red mud.

The invention relates to the technical field of emerald color changing, and particularly discloses a method for changing gray green emerald into red emerald through oxidation and heating and application of the method. According to the method, potassium permanganate is selected as an oxidizing agent, the grey green jadeite can be efficiently and uniformly changed into red jadeite by controlling the heating temperature and the heating time, and the color-changed product has the characteristics of high chromaticity and good stability and can be widely applied to the fields of jewelry, artwork and collections. Compared with red jadeite obtained through a traditional heating mode and ferrous carbonate and ferrous oxide powder covering heating, the color change is more thorough through potassium permanganate auxiliary heating, the added potassium permanganate powder is not directly attached to the jadeite raw materials, no chemical substance is additionally added to the jadeite raw materials, and the due characteristics of natural jadeite are reserved. The method provided by the invention is simple and low in cost, the color of the obtained red FeiCui is close to that of natural red FeiCui, and the color is natural and durable.

The present invention relates to a "magnetic - electric - flotation" combined separation process for high - carbonate mixed iron ore. The present invention combines the electric separation process with magnetic separation and flotation, and adds an electric separation process after the strong magnetic separation operation, so as to effectively remove ferrous carbonate in the mixed iron ore before the mixed iron ore enters the flotation process. Through the "magnetic - electric - flotation" combined separation process, the strongly magnetic magnetite in the mixed iron ore is separately selected by weak magnetic separation; at the same time, ferrous carbonate, which is easily slime - forming but has poor conductivity among the weakly magnetic minerals, is separated and removed by electric separation, reducing the content of ferrous carbonate in the iron ore entering the flotation process, improving the flotation operation index, and realizing the efficient development and utilization of high - carbonate mixed iron ore. Compared with the existing process, the method used in the present invention has a large variety of minerals in the ore to be treated, and can still effectively treat iron ore with a ferrous carbonate content greater than 10%.

The application provides a preparation method and application of Prussian blue and activated carbon-Prussian blue material. The preparation method of the Prussian blue comprises the following steps: adding a reducing agent to an aqueous solution containing ferricyanide complex for reduction treatment, so that the ferricyanide complex is reduced into ferrocyanide, and a ferrocyanide solution containing ferrocyanide and other reducing substances is obtained; adding a first iron salt solution to the ferrocyanide solution for de-reduction treatment, so that the other reducing substances contained in the ferrocyanide solution are removed, and a ferrocyanide ferrous carbonate precipitate and a post-precipitation liquid containing ferrocyanide are obtained through solid-liquid separation; and adding a second iron salt solution to the post-precipitation liquid for post-treatment, so that the ferrocyanide reacts with iron ions to obtain a Prussian blue slurry. The preparation method provided in the examples of the application can reduce the impurity content of the Prussian blue, improve the purity of the Prussian blue, and is beneficial to the preparation of activated carbon-Prussian blue material with better energy absorption performance.

The invention relates to the field of liquid foliar fertilizer preparation. The invention relates to a preparation method of a special efficient iron-supplementing stress-resistant liquid foliar fertilizer for flowers, which comprises the following steps of: preparing ferrous carbonate by double decomposition reaction: adding ferrous sulfate and ammonium bicarbonate into deionized water at 20-28 DEG C, and reacting under a stirring condition to obtain a ferrous carbonate turbid liquid with the pH value of 6.2-6.8; adjusting the pH value of the ferrous carbonate turbid liquid to 4-6 by using an acetic acid or sodium acetate buffer solution, then adding disodium ethylene diamine tetraacetate into the ferrous carbonate turbid liquid, heating to 40-45 DEG C, and forming an EDTA-Fe < 2 + > chelating solution under a stirring condition; cooling the EDTA-Fe < 2 + > chelating liquid to room temperature, sequentially adding polyglutamic acid, sodium lignin sulfonate and boric acid, and uniformly stirring to obtain the efficient iron-supplementing stress-resistant liquid foliar fertilizer special for flowers. According to the invention, the contradiction that the traditional fertilizer can not promote the flower when supplementing iron and can not resist stress when promoting the flower is solved.

The invention relates to a preparation method of an ion exchange resin permanent magnetic material for a high-speed water treatment process, and discloses a preparation method of an ion exchange resin permanent magnetic material. The preparation method comprises the following steps: performing double decomposition reaction on a carbonate solution and a ferrite solution to obtain active ferrous carbonate, and calcining until the active ferrous carbonate is completely decomposed into active ferroferric oxide; according to the preparation method, active ferroferric oxide is subjected to an oxidation reaction at a proper temperature, and Fe3O4 is controlled to be completely converted into gamma-Fe2O3. The final product is high in purity, gamma iron oxide generated after calcination and oxidation is easily modified in the process of preparing magnetic ion exchange resin, and the method is suitable for a high-speed water treatment process of a suspension reaction layer. The method is characterized by comprising the following steps: (1) dissolving ferrite in water to prepare a ferrite solution with the concentration of 0.1-1mol / L, and dissolving carbonate in water to prepare a carbonate solution with the concentration of 0.1-1mol / L; (2) pumping the carbonate solution into the ferrite solution, stirring for 30-60 minutes, enabling the carbonate solution and the ferrite solution to be subjected to double decomposition reaction, and enabling the mixed solution to gradually become floccule precipitates;

This invention discloses a method for preparing an autotrophic denitrification packing material, specifically: 0.3–1.2 parts by weight of dolomite powder, 90–95 parts by weight of modified sulfur powder, 0.5–1.5 parts by weight of iron powder, 1–2 parts by weight of ferrous carbonate powder, 0.5–2 parts by weight of sodium bicarbonate, 0.5–1.5 parts by weight of kaolin, 0.5–1.2 parts by weight of straw powder, and 0.5–1 parts by weight of sodium hexametaphosphate are placed in a disc granulator and mixed evenly. A liquid bio-enhancing agent is then sprayed into the disc granulator. Upon contact with the liquid, the solid powder in the disc granulator gradually forms spherical particles under the tilting and stirring action of the granulator. This invention also discloses the application of the autotrophic denitrification packing material prepared by the above method in the treatment of wastewater from an electronics industrial park.