8 results about "Ferric oxalate" patented technology

This invention provides a process and equipment for the synergistic recovery of metals from waste lithium-ion batteries through mechanical activation and photolysis extraction, relating to the field of metal material recycling technology. The process includes the following steps: Step S1, mixing ternary cathode material and lithium iron phosphate cathode material, washing and drying to remove surface dirt and residual electrolyte, obtaining a mixed cathode material; Step S2, homogenizing the mixed cathode material and ball milling to obtain a pretreated cathode material. This scheme ultimately achieves the destruction of the cathode material's crystal structure through mechanical force, increasing reactivity and metal leaching rate, reducing the amount of chemical reagents used, and utilizing the photosensitivity of ferric oxalate complexes to achieve efficient separation and recovery of iron under light conditions, avoiding the use of additional precipitants, reducing secondary pollution, and featuring advantages such as simple operation, low energy consumption, and no secondary pollution. It effectively achieves efficient separation and purification of multiple metal elements in waste lithium-ion batteries, realizing high-value recovery of valuable metals.

The invention relates to the technical field of sodium ion batteries, in particular to a modified ferric sodium pyrophosphate positive electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) reacting an oxalic acid source, an iron source and a manganese source in an aqueous solution to obtain an iron manganese oxalate intermediate; and (2) uniformly mixing the ferric manganese oxalate intermediate with sodium phosphate, sodium pyrophosphate and a reducing agent, heating to obtain a gelatinous solid, drying and sintering to obtain the modified ferric sodium phosphate pyrophosphate positive electrode material. The nucleation and growth rate of particles in the precipitation process is regulated and controlled through manganese ions by adopting a coprecipitation method, so that the particles are more tightly stacked, the compaction density of the product is effectively improved, meanwhile, the conductivity and the structural stability of the ferric sodium pyrophosphate can be effectively improved through manganese doping, and the performance of the ferric sodium pyrophosphate is improved. Therefore, the prepared modified sodium ferric pyrophosphate positive electrode material has relatively high discharge platform voltage and energy density, and excellent rate capability and cycle performance.

This invention discloses a maltol-ferric oxalate cocrystal, which is formed using maltol-ferric as the active pharmaceutical ingredient and oxalate as the cocrystal ligand via a suspension stirring method. In the X-ray powder diffraction pattern obtained using Cu-Kα radiation, the maltol-ferric oxalate cocrystal exhibits characteristic diffraction peaks at diffraction angles 2θ of approximately 14.7±0.2°, 17.0±0.2°, 17.6±0.2°, 24.8±0.2°, 26.6±0.2°, and 26.9±0.2°. The maltol-ferric oxalate cocrystal of this invention exhibits good stability, showing no crystal transformation for at least 60 days under accelerated conditions. Compared to maltol-ferric, the maltol-ferric oxalate cocrystal has relatively lower solubility in water. Low-solubility cocrystals typically dissolve more slowly, avoiding rapid drug concentration peaks, reducing the toxic side effects of maltol-ferric, and improving medication adherence.

The invention relates to a method for recovering platinum group metals from high-silicon precious iron by using CO2 and realizing material circulation, and belongs to the technical field of secondary resource recovery of the platinum group metals. The method comprises the following steps: after melting a high-silicon precious iron alloy, blowing CO2 gas in the presence of a slag former to carry out selective desilicication smelting to obtain an active low-silicon precious iron alloy, CO-containing tail gas and silicon-containing slag; the method comprises the following steps: combusting CO-containing tail gas to obtain CO2 gas, dissolving the active low-silicon precious iron alloy to prepare liquid to obtain a platinum group solution containing iron ions, and adding oxalic acid into the platinum group solution containing iron ions to selectively precipitate iron ions to generate ferric oxalate and a platinum group metal enriched solution; the ferric oxalate is calcined to obtain iron oxide and CO2 gas, the iron oxide is used for smelting and collecting platinum group metal to generate high-silicon precious iron alloy, and platinum, palladium and rhodium are refined and separated from a platinum group enriched solution; and the CO2 gas is returned to desilicication smelting or electrocatalytic reduction to prepare oxalic acid. According to the method, through the synergistic effect of CO2 gradient impurity removal and oxalic acid iron precipitation, iron and carbon closed-loop circulation is achieved.

The invention provides an alkyl uracil derivative and a preparation method and application thereof, and relates to the technical field of organic synthesis.The preparation method comprises the following steps that a uracil analogue and olefin are subjected to a hydrogenation alkylation reaction under the action of an iron catalyst and a hydrogen source, and the alkyl uracil derivative is obtained; the iron catalyst comprises at least one of iron nitrate nonahydrate, ferrous nitrate, ferric chloride, ferrous chloride, ferric sulfate and ferric oxalate; the hydrogen source comprises at least one of sodium borohydride, lithium borohydride, lithium aluminum hydride, triphenyl silicon, triethyl silicon and borane. According to the present invention, the olefin is adopted as the alkyl raw material, the pre-functionalization is not required, the specific catalyst and the specific hydrogen source are combined, the hydrogenation alkylation reaction of the olefin and the uracil analogue is successfully achieved, and the technical effect of constructing a series of alkyl uracil derivatives is achieved. According to the invention, the reaction can be carried out at room temperature without light and heat conditions, the reaction time is short, and the functional group tolerance is better.

The present invention relates to the technical field of battery materials. Disclosed are a composite sodium iron phosphate material and a precursor thereof, and a preparation method. The chemical formula of the composite sodium iron phosphate material is Na4Fex(PO4)2(P2O7) / C, wherein 2.92≤x≤3; the degree of crystallinity of the composite sodium iron phosphate material is C0≥3.895. The precursor is prepared by means of a specific iron source (ammonium ferrous phosphate, ferric oxalate, or ferric citrate). During the preparation of the precursor, no carbon source is added. During the preparation of the composite sodium iron phosphate material from the precursor, a carbon source and a sodium source are added and the mixture is sintered to obtain the composite sodium iron phosphate material having high compaction density. In addition, the composite sodium iron phosphate material has good electrochemical performance. The present invention further claims a battery comprising the composite sodium iron phosphate material.

The invention belongs to the technical field of battery materials, and discloses a composite sodium ferric phosphate material and a precursor and a preparation method thereof. The chemical expression of the composite sodium ferric phosphate material is Na4Fex( PO4) 2 (P2O7) / C, wherein x is more than or equal to 2.92 and less than or equal to 3; the crystallinity C0 of the composite sodium ferric phosphate material is greater than or equal to 3.895. A specific iron source (ammonium ferrous phosphate, ferric oxalate and ferric citrate) is adopted to prepare a precursor, a carbon source is not added in the process of preparing the precursor, the carbon source and a sodium source are added in the process of preparing the composite sodium ferric phosphate material from the precursor, sintering is performed, and the composite sodium ferric phosphate material with high compaction density is obtained. Meanwhile, the composite sodium ferric phosphate material has good electrochemical performance. The invention further discloses a battery comprising the composite sodium ferric phosphate material.

The present invention discloses a method for removing oxalic acid and ferric oxalate complexes from a molten liquid. The method comprises the following steps: S1, subjecting a solution containing a target metabolic small molecule, oxalic acid, and ferric oxalate complexes to UV irradiation at a low temperature not higher than 77K, and then placing the solution in a dDNP spectrometer for polarization and melting to obtain a molten liquid; S2, rapidly adding a sodium hydroxide solution to the molten liquid to adjust the pH of the solution to alkaline, causing precipitation to begin; S3, after the precipitation is complete, rapidly filtering and removing the precipitate to obtain a filtrate; S4, rapidly adding a hydrochloric acid solution to the filtrate to adjust the pH of the filtrate to neutral, causing precipitation to begin; S5, after the precipitation is complete, rapidly filtering and removing the precipitate to obtain a polarized clear liquid from which oxalic acid and ferric oxalate complexes are removed, and injecting the polarized clear liquid into a magnet to be detected in the dDNP spectrometer. The present invention introduces excess sodium hydroxide and a pressurized filtration impurity removal device to successfully remove oxalic acid and oxalate complexed iron from the molten liquid.