12 results about "Iron carbonate" patented technology

The present invention provides a method for utilizing carbon dioxide to enhance the dehalogenation of halogenated organic matter in groundwater and the simultaneous mineralization and storage of carbon dioxide, which adopts a scheme combining groundwater remediation and greenhouse gas storage, and aims to utilize carbon dioxide CO2 to enhance the dehalogenation of dissolved divalent iron (Fe) in the underground environment. II The method can effectively dehalogenate HOCs by injecting CO2 to increase the concentration of Fe in groundwater. II The dehalogenation activity of CO2 and Fe II The reaction generates stable iron carbonate FeCO₃, achieving CO₂ fixation and mineralization, thereby achieving a synergistic effect of pollution and carbon reduction, providing a new solution for groundwater remediation and climate change mitigation. This method has strong environmental and social benefits and has broad prospects for promotion and application.

This apparatus for fixing carbon dioxide comprises a generation device and a portable unit. The generation device includes at least one among a carbonate generation unit, an iron chloride generation unit, and an iron carbonate generation unit. The portable unit supports the generation device in a transportable manner.

The application discloses a method for analyzing phases of iron in ores, and belongs to the technical field of mineral analysis. The method comprises the following steps: after magnetic separation of an ore sample, performing iron valence state analysis on a magnetic product, and distinguishing a magnetic iron phase, a pseudo hematite phase and a magnetic intergrowth phase based on the deviation degree of the ratio of divalent iron to trivalent iron from the theoretical ratio of magnetite; sequentially performing iron carbonate phase selective leaching-oxidation post-treatment, hematite-limonite phase reduction-inhibition synergistic selective dissolution, iron sulfide phase liquid phase complexation-solid phase charring step-by-step extraction and iron silicate phase alkali fusion digestion on a non-magnetic product; and finally, performing plasma atomic emission spectrometry on each phase to-be-measured solution and total iron digestion liquid, and calculating the iron content of each phase. The application solves the key problems in traditional iron phase analysis, such as incomplete classification of magnetic iron, poor selectivity of non-magnetic phase and insufficient wide use.

The utility model discloses an ammonia water purification and iron removal device which comprises an ammonia water storage bin, the outer wall of the ammonia water storage bin is fixedly connected with a water conveying pipe, the outer wall of the top of the water conveying pipe is fixedly connected with a reagent bin used for filling reaction reagents into the water conveying pipe, and the inner wall of the water conveying pipe is rotationally connected with an impeller and an auger frame. The ammonia water purification and iron removal device belongs to the technical field of ammonia water purification and iron removal devices, and aims to solve the problems that in the prior art, iron ions in ammonia water are inconvenient to fully remove, integrated equipment is inconvenient to pass, and the iron removal efficiency is high. The technical effects are achieved as follows: by arranging the reagent bin, the ammonia water and the reagent can be subjected to mixed reaction, the reaction between carbonate ions and the iron ions is promoted, iron carbonate precipitates are formed, so that the iron in the ammonia water is conveniently removed, the working efficiency is improved, and the labor intensity of workers is reduced. And operation processes are reduced.

The present invention provides a manganese iron carbonate precursor, a preparation method thereof, a positive electrode active material, a positive electrode sheet, and a battery. The manganese iron carbonate precursor includes a manganese iron carbonate core and an FeCO3 shell disposed on at least a part of the surface of the core; the chemical formula of the manganese iron carbonate precursor is (Mn x Fe y )·(x + y)(CO3)·zFeCO3, where x + y + z = 1, x + y ≤ 0.9, x ≥ 0.3, and y ≥ 0.125x. The manganese iron carbonate precursor provided by the present invention is used to prepare a positive electrode active material. After the positive electrode active material is used in a battery, the cycle performance and rate performance of the battery can be significantly improved.

The invention relates to the technical field of waterworks end treatment, and discloses a method for removing odor substances in water through coupling of a foam iron-based modified functional interface material and ozone micro-nano catalytic oxidation. The foam iron-based modified functional interface material is prepared by the following steps: after foam iron is subjected to acid etching in-situ activation, synthesizing a foam iron-based manganese iron carbonate compound (MnCO3-FeCO3 (at) IF) in situ on the foam iron through a urea gradient hydrothermal method; ozone is introduced into a water phase in the form of micro-nano bubbles by utilizing a gas dissolving and releasing method based on pressurization, shearing force and a Venturi principle, and odor substances are efficiently removed through micro-nano coupling of a foam metal material and ozone. Through the unique interface mass transfer strengthening mechanism of the micro-nano bubbles, MnCO3-FeCO3atIF generated on the surface of the foam iron-based modified functional interface material in situ and the synergistic effect of the MnCO3-FeCO3atIF and ozone, efficient removal of smelly substances is achieved, and the bottleneck of targeted removal of intractable smelly molecules by traditional ozone oxidation is broken through.

The present disclosure discloses a nickel-manganese-copper-iron carbonate precursor, a preparation method and an application in preparation of a sodium-ion battery positive electrode material, which can realize complexation of Ni 2+ , Mn 2+ , Fe 2+ , Cu 2+ four metal ions and slow release under the action of a precipitant, co-precipitation of the four metal ions, uniform morphology of the prepared precursor without segregation, reduction of sodium, sulfur and other impurities in the precipitated product through post-treatment of the product, and increase of the copper content in the precursor.

The application discloses a method for preparing a self-sustaining simultaneous denitrification and phosphorus removal agent by mechanically and chemically activating iron sulfide and an application method thereof, and is characterized in that iron sulfide (including magnetite pyrite ore, low-sulfur fine powder and sulfur fine powder) is used as a main raw material, iron oxide and iron carbonate are used as accelerators, the two are compounded, mixed and ground, then a slurry is prepared by using water and is mechanically and chemically activated to obtain a slurry-shaped denitrification and phosphorus removal agent, or the activated product is vacuum dried and mixed with molten sulfur to obtain a granular denitrification and phosphorus removal agent. The method can greatly improve the biological reaction activity of the iron sulfide and greatly improve the efficiency of the simultaneous denitrification and phosphorus removal.

This powder contains a plurality of iron carbonate particles. The average particle diameter of the iron carbonate particles is 10 nm-1 μm inclusive, and the shape of the iron carbonate particles is spherical.

The invention provides a composite anti-corrosion coating as well as a preparation method and application thereof. The composite anti-corrosion coating comprises 4-8 wt% of a corrosion inhibitor, 2-15 wt% of an anti-corrosion agent, 40-90 wt% of a solvent, 10-40 wt% of resin and any additive. The invention discloses an anti-corrosion coating. According to the anticorrosive paint disclosed by the invention, the corrosion inhibitor and the anticorrosive agent are compounded for use, and the corrosion inhibitor has the effect of forming insoluble and corrosion-resistant protective coatings such as ferric silicate salt, ferric phosphate salt and ferric carbonate salt on a metal surface through reaction of silicate, phosphate, carbonate and iron ions, so that corrosion is hindered; the anti-corrosion agent has the effects that a hydrophilic group is combined with the metal surface through a molecular structure with surface activity, and a hydrophobic structure is exposed in a corrosive solution, so that oxygen diffusion and water entering the metal surface are limited, and the corrosion rate is reduced.

The application discloses a simple preparation method of a manganese iron carbonate precursor and a lithium manganese iron phosphate positive electrode material, and the method comprises the following steps: dissolving soluble divalent manganese salt and divalent iron salt in water, adding ascorbic acid to obtain a metal salt solution; preparing a soluble carbonate aqueous solution as a precipitant solution; under the condition of stirring and heating, the metal salt solution is dropped into the precipitant solution for a coprecipitation reaction; after solid-liquid separation, the manganese iron carbonate precursor is obtained through washing and drying; the precursor is used as a manganese source and an iron source, mixed with a lithium source, a phosphorus source and a carbon source, ball milled, dried, pre-fired in an inert atmosphere, ball milled again, dried, and high-temperature sintered in an inert atmosphere, so that the lithium manganese iron phosphate positive electrode material is obtained. The manganese iron carbonate precursor with uniform manganese iron distribution can be prepared in a normal pressure atmospheric environment, the high-performance lithium manganese iron phosphate positive electrode material is obtained through simplification of the process, the production complexity and cost are significantly reduced, and the large-scale preparation is facilitated.

The invention belongs to the field of inorganic nonmetallic materials, and discloses nitrogen-doped porous carbon and a preparation method and application thereof.The preparation method comprises the steps that biomass, melamine and a metal activator are mixed according to the mass ratio of 3: (1-2): (3-5) and soaked in pure water for 12-24 h, then freeze drying, high-temperature carbonization, acid etching and cleaning are conducted, and the nitrogen-doped porous carbon is obtained; the biomass is selected from at least one of bamboo powder, bagasse and straw; the metal activator is selected from at least one of sodium carbonate, potassium carbonate, calcium carbonate, zinc carbonate, sodium bicarbonate, potassium bicarbonate, calcium bicarbonate, iron carbonate, zinc chloride, zinc oxide, zinc acetate, sodium acetate, potassium acetate or calcium acetate; through the design, the porous carbon material with high specific surface area and good heavy metal ion adsorption capacity is prepared.