79 results about "Ferric oxalate" patented technology

The invention relates to superfine iron-copper alloy powder and a preparation method thereof. The superfine iron-copper alloy powder is prepared by using ferric oxalate powder at an industrial raw material stage and cupric oxide powder at an industrial raw material stage as raw materials through high-energy ball milling and hydrogen reduction and has a fisher particle size smaller than 1.0 microns and a oxygen content smaller than or equal to 0.5 percent by weight. The invention has the advantages that grains of the superfine iron-copper alloy powder are thinner, the physical and chemical properties are superior, and the manufacture cost is low.

The new method for preparing high crystallinity monodisperse water-soluble magnetic nano microparticles is characterized by that it selects the inorganic iron salts of anhydrous iron trichloride and iron chloride, etc. or metal organic iron compounds (such as iron pentacarbonyl, iron triacetylacetonate, iron biacetylacetonate, complex of cupferron and iron salt, iron octoate and ferric oxalate, etc.) as iron raw material, and utilizes high-temp. decomposition of them in high boiling point polar solvent (for example alpha-pyrrolidone and its derivatives (N-methyl-2-pyrrolidone and N-ethyl-2-pyrrolidone, etc.), N,N-dimethyl-2-imidazolone, hexametapol, gamma-butyrolactone and its derivative and low molecular weight (molecular weight M is less than or equal to 5000) polyglycol and its derivatives) to prepare magnetic nano microparticles. Said invention can adopts different iron raw materials and high boiling point polar solvents so as to obtain different types of magnetic nano microparticles (Fe, Fe2O3 and Fe3O4) with different sizes and crystallinities and different crystal structures.

The invention provides a method for hydrothermal deposition of an iron oxide film through a one-step method by using single-source soluble complex iron salt as a precursor. The firm and compact iron oxide film is obtained through performing hydrothermal deposition onammonium ferric citrate or ammonium ferric oxalate serving as a raw material at a temperature of 90-200 DEG C. The iron oxide film, prepared by adopting the method, can be directly deposited on F-doped tin dioxide electric conducting glass, a surface-treated stainless steel substrate or common glass. The film obtained by being activated in the process that the iron oxide is reduced by ethanol and reoxidized has excellent photoelectric property. The method has the advantages that the concentration of other additives in solution does not need to be adjusted due to the fact that not many reaction precursors are used; the iron oxide film is directly obtained without adopting the process of annealing FeOOH and converting the annealed FeOOH into iron oxide, so that the manufacturing cost is reduced.

The invention discloses a negative temperature coefficient two-phase composite heat-sensitive material and a method for preparing the same characterized by mixing and milling the copper acetate, ferric oxalate, manganese acetate, nickel acetate and oxalate according to the mol ratio of 0.2-0.6: 1: 3.48-3.08: 1.32: 7.2, calcining the mixture after drying, mixing the prepared powder with partial stable cubic zirconia powder according to the mol ratio of 1: 1.5-4, getting two-phase composite powder after milling and drying, getting the negative temperature coefficient material with a relative density more than 94% after sintering. The material has a stable structure, a sintering temperature between 1200 and 1250 DEG C, a higher mechanical strength than the single-phase spinel ceramic, a B value less than 2800K, a resistivity of 1000omega.cm, a resistance drift less than 3% when accelerated ageing 1000 hours at 150 DEG C, a very good NTC property between -60 DEG C to +50 DEG C, and is suitable for the negative temperature coefficient heat sensitive sensor material in the modern aerostat.

The invention discloses a non-woven cloth suspension filler which is prepared by the following constituents in parts by weight with the conventional method: 40-50 parts of polyethylene, 25-35 parts of polypropylene, 6-10 parts of carbon black, 3-7 parts of ferric oxalate, 4-6 parts of magnesium oxalate and 1-2 parts of antioxidant. The specific gravity of the non-woven cloth suspension filler is closed to that of water. No fixing support is required. The filler can suspend in the water in a pool with aeration stirring and is uniformly fluidized in the whole pool. The energy consumption is low, and the non-woven cloth suspension filler has a good prospect.

A direct emulsion process for making printed circuits and printed circuit boards which includes coating a non-metallized substrate with a solution which creates a light sensitive surface on the substrate, imaging the coated substrate with a circuit design, developing the imaged substrate, and directly plating the developed image onto the coated substrate. Coating solutions which work particularly well in this process include a ferric oxalate and palladium emulsion or a silver based emulsion.

The invention relates to a preparing method of a catalyst used for preparing low-carbon olefins from synthetic gas and applications of the catalyst. Active components of the catalyst are Fe and Zr. Assistants of the catalyst are Zn and K. The catalyst comprises 20-80 wt% of the Fe, 20-80 wt% of the Zr, 5-20 wt% of the Zn, and 0.5-5 wt% of the K. The catalyst is prepared by a microwave hydrothermal method and a dipping method. Urea is adopted as a precipitator. An active component ferric salt is one selected from ferric nitrate and ferric oxalate. A zircon salt is one selected from zirconium oxychloride, zirconium nitrate and zirconium oxynitrate. An assistant zinc salt is selected from zinc nitrate and a potassium salt is selected from potassium carbonate. Compared with the prior art, the catalyst has characteristics of cheap and easily available raw materials, simple preparation process, short cycle, low energy consumption, good repeatability, low cost and suitability for industrial production. The CO conversion per pass is higher than 93%. The olefin-alkyl (O/P) ratio is higher than 4.80. The yield of C2-C4 olefins can reach 68.15-72.38 g/[m<3>(CO+H2)]. CH4, CO2 and C<5><+> can be maintained in a relatively low value. The reaction products are well distributed. The utilization rate of the synthetic gas is increased.

The invention discloses a preparation method of lithium ion battery anode materials mixed with stibium and barium. Plasma materials with micrometer diameters can be obtained after diammonium hydrogen phosphate, ferric oxalate, carbonic acid lithium, antimony trioxide, barium hydroxide, and yttrium oxide are mixed and ball-milled. Nanometer precursors can be obtained after the plasma materials are filtrated, washed and dried. The lithium ion battery anode materials mixed with the stibium and the barium can be obtained after the nanometer precursors are sintered. With utilizing lithium iron phosphate composite materials, a lithium ion battery can use a special ratio and a ternary-form sintering method, wherein the lithium ion battery is prepared by the preparation method of the lithium ion battery anode materials mixed with the stibium and the barium. Antimony, barium, rare earth element yttrium, and the like can be mixed in the lithium iron phosphate composite materials and property of the lithium iron phosphate composite materials can be changed. The lithium iron phosphate composite materials mixed with the stibium and the barium is high in energy density and good in electrical conductivity when applied in the lithium ion battery. Therefore, the lithium ion battery is high in specific capacity and stable in cycle property.

The invention belongs to the technical field of recycling of industrial waste, and particularly relates to a method for synchronously and efficiently extracting high-value recycled rare earth and ironfrom neodymium-iron-boron waste. According to the method, an oxidation product obtained after the neodymium-iron-boron waste is subjected to oxidative roasting is reacted with an oxalic acid solution, a leaching solution containing ferric oxalate and a solid precipitate mainly contains oxalic acid rare earth can be obtained, then iron reduction and molten salt electrolysis treatment are carried out only on the leaching solution and the precipitate respectively, and rare earth alloy for producing neodymium-iron-boron materials and ferrous oxalate used in the lithium battery material productioncan be obtained. According to the method, only the oxalic acid solution is used as a leaching agent and a precipitant, and leaching of iron and transformation of rare earth can be completed in one step, so that the purpose of synchronous realization of efficient extraction and high-value reuse of iron and rare earth is achieved, in the case of the method, the extraction process is short, the environment-friendly effect is achieved, high-value products can be effectively recovered and obtained, and extremely high process operability is achieved.

The invention relates to a preparation method of a lithium titanate composite cathode material of a lithium battery, and belongs to the technical field of cathode materials of lithium ion batteries. The method comprises the steps that a lithium titanate precursor is prepared; soluble ferric salt is added to oxalic acid mixed with the lithium titanate precursor; a suspension of ferric oxalate and the lithium titanate precursor is prepared by a precipitation method; and finally high-temperature treatment is performed on mixed powder to obtain the lithium titanate and ferric oxide composite cathode material. The lithium titanate composite cathode material prepared by the method has the rapid charging performance of a lithium titanate material and the high specific capacity performance of ferric oxide; the cost is low; a technology is simple; and industrial production is facilitated.

The invention provides a method for treating organic waste water by an iron complexing Fenton reaction, and belongs to the field of environmental waste water treatment. The method includes the following steps: sequentially adding oxalic acid, FeSO4*7H2O and calcium peroxide into organic waste water for degradation reaction. In the method, the oxalic acid and the FeSO4*7H2O can generate a ferric oxalate complex; calcium peroxide is a solid source of hydrogen peroxide, which is convenient for transportation and storage; the ferric oxalate complex reacts with CaO2 to obtain a Fenton-like system,which can promote stable generation of *OH, avoid disproportionation and decomposition of H2O2, and improve the utilization rate of H2O2; and meanwhile, the addition of the oxalic acid can prolong theexistence time of free Fe2+/Fe3+ and further reduce the precipitation of iron mud, and thus the removal efficiency of organic matters in waste water by the Fenton-like system is improved. Compared with the traditional Fenton method, the method can be applied to organic waste water with a pH value of 3-11.

The invention provides a ternary silicate composite cathode material. The cathode material is carbon-coated ternary silicate having the specific structural formula: LixFe alpha M1 beta M2 gamma SiO4/C, wherein x is greater than or equal to 2.0 and less than or equal to 2.1; alpha+ beta+ gamma is equal to 1; alpha is greater than or equal to 0.2; beta is greater than or equal to 0.2; gamma is greater than or equal to 0.2; M1 and M2 are transitional metal elements; the preparation method is as follows specifically: putting lithium carbonate, ferric oxalate and two kinds of M1 and M2 sources containing different transitional metals into a container, and taking absolute ethyl alcohol as the medium for stirring for 30-180 min, and then adding ethyl silicate to obtain mixed liquid; drying the mixed liquid to obtain a dry material; adding the carbon source into the dry material, taking acetone as the medium, performing ball milling, and sintering in a nitrogen or argon atmosphere to obtain a target product; stirring the product with acetylene black and polyvinylidene fluoride in N-methyl pyrrolidone, and coating an aluminum foil with the stirred product, and then performing drying, film stamping and film pressing to obtain the ternary silicate composite cathode material plate. The preparation method is low in cost, pollution-free, low in harmful gas emission in the synthetic process, and excellent in the electrochemical performance of the material.

The invention relates to a preparation method of a lithium iron phosphate precursor. The method includes the steps of: subjecting ferric oxalate to temperature-programmed calcination to obtain anhydrous ferric oxalate; crushing the anhydrous ferric oxalate and performing sieving, then according to the mass of the sieved anhydrous ferric oxalate, using supercritical water to perform washing 3 times so as to obtain ferric oxalate powder; putting the ferric oxalate powder into a reactor, introducing oxygen, and carrying out full reaction for 5min so as to obtain purified ferric oxalate; adding sodium phosphate into phosphoric acid for acidification, and adjusting the pH so as to obtain a sodium phosphate solution; transferring the purified ferric oxalate and the sodium phosphate solution into a hydrothermal high temperature and high pressure kettle, then adding iron phosphate seed crystal to carry out reaction for 14h, thus obtaining iron phosphate crystals; adding a dispersant into the iron phosphate crystals, and fully mixing the substances, thus obtaining a lithium iron phosphate precursor. The preparation method of the lithium iron phosphate precursor provided by the invention has the characteristics of simple production process and mild reaction conditions, and the precursor product has high purity, regular shape and good consistency, thus being capable of realizing industrial production.

The invention belongs to the technical field of well drilling auxiliary agents and discloses a ceramsite fracturing propping agent preparation method. The method includes steps: subjecting albite, bauxite, kaolin, coal ash, dolomite, potassium permanganate, cryolite, low-melting-point alloy powder, graphite, cupric oxalate, ferric oxalate, calcium carbonate and modified bamboo fiber powder to mixed ball milling, and filtering through a 120-mesh screen to obtain mixed powder; stirring and mixing sodium fluoride solution and peach gum liquid according to a mass ratio of 1:20-1:30 to obtain mixedslurry; mixing mixed powder with mixed slurry according to a mass ratio of 3:2-3:1, granulating, drying, carbonizing and sintering to obtain a blank material; stirring and mixing the blank material with modified sodium alginate liquid according to a mass ratio of 1:20-1:30, filtering and drying to obtain a ceramsite fracturing propping agent. Mechanical properties and permeability of the ceramsite fracturing propping agent are both improved effectively.

The invention relates to a compound flux of high-MgO sinter ore, and a preparation method and application of the compound flux, belongs to the field of hematite sintering. The compound flux comprises a MgO source and a water-soluble additive, wherein the water-soluble additive is a combination of one or more than one of boric anhydride, calcium chloride, ferric oxalate, iron nitrate and ammonium ferrie oxalate. The preparation method comprises the following steps: first, dissolving the water-soluble additive in water; then, pouring the MgO source material to realize that the additive is uniformly adhered on the surfaces of the MgO source particles; putting into a drying oven below the temperature of 95 DEG C for drying, thereby obtaining the compound flux of the high-MgO sinter ore. During sintering, the compound flux, the hematite and the lime flux are mixed together to serve as the MgO flux, so that the MgO content in the sinter ore can be increased to 4 percent. Meanwhile, the additive has a low melting point, the sintering mineralization rate is improved, and as a result, reasonable mineral composition and phase structure can be obtained, the sinter ore strength and high-temperature metallurgical property can be improved, also, the finished product ratio and drum rotating index are obviously improved.

The invention provides a feed for poultry. The feed comprises the following components in parts by weight: 50-90 parts of corn flour, 15-35 parts of bran, 10-20 parts of soybean meal, 0.2-2 parts of ferric oxalate, 0.1-0.5 part of zinc oxalate, 0.1-0.8 part of nanometer copper oxide, 0.02-0.06 part of nanometer cobalt oxide, 0.01-0.06 part of magnesium chloride, 0.02-0.05 part of potassium iodide, 0.01-0.1 part of maltooligosaccharides, 0.05-0.2 part of isomaltooligosacharides, 0.05-0.5 part of cyclodextrin glucose, 0.01-0.5 part of polyethylene glycol fatty acid ester, 0.2-2 parts of triglyceride, 0.1-0.3 part of propylene glycol fatty acid ester, 3-5 parts of haw powder, 2-8 parts of carrot powder and 2-6 parts of attapulgite. The feed has the characteristics of being wide in application range, comprehensive in nutrition, good in absorbability, difficult to agglomerate, difficult to mildew and rot and the like.

The invention discloses a preparation method for lithium iron phosphate. The method comprises the following steps: mixing high-purity phosphoric acid, lithium hydroxide and ferric oxalate; regulating the pH value to 5.0-6.0; drying the mixture at the temperature of 60-80 DEG C; heating the dried mixture to 300-400 DEG C at a rate of 5 DEG C/h in a reacting furnace; carrying out insulation reaction for 3 hours, and then cooling to room temperature; smashing the obtained mixture; evenly mixing the smashed mixture with lithium hydroxide, a carbon source and metallic oxides by a ball mill, and utilizing a colloid mill to pulp the blend at the temperature of 16-20 DEG C for 6-10 hours; and drying at the temperature of 60-80 DEG C, and sintering at the temperature of 600-800 DEG C for 3-6 hours in the reacting furnace in the presence of inert gas, thus preparing the lithium iron phosphate product. The preparation method is smart in concept and simple in process; and by means of the method, the stacking density and electrical conductivity of the lithium iron phosphate can be effectively improved.

The invention provides a nano lithium iron silicate/graphene anode material for a lithium battery and a preparation method thereof. The preparation method comprises the following steps: mixing graphene oxide, ferric oxalate, lithium silicate and ammonia water; adding a dispersant for wet process ball-milling; and then carrying out thermal treatment to obtain nitrogen-doped lithium iron silicate/graphene. By performing replaced doping on graphene and lithium iron silicate through nitrogen atoms to replace carbon atoms in graphene and oxygen atoms in lithium iron silicate, the de-embedding potential barrier of lithium ions is reduced, and meanwhile, nitrogen atoms are introduced to form N-suspended keys in graphene, and the suspended keys after deep de-embedding of lithium ions and anions form weak covalent bond joint, so that the structural integrity of the anode material is kept. The method provided by the invention solves the problems that lithium ions of a conventional lithium iron silicate material are incompletely de-embedded, the capacity is low and the structure of the material after deep de-embedding collapses, the migration rate of lithium ions in the anode material is increased, and the discharge rate and the cycling stability of the battery are improved.

The invention discloses a lithium ion battery negative electrode active material Mn<x>Fe<1-x>C2O4 and a synthesis method and application thereof. Manganese oxalate with a rod-like structure is prepared by adopting a hydrothermal or solvothermal method. In addition, a proper proportion of ferrite is doped, and a series of manganese ferric oxalate Mn<x>Fe<1-x>C2O4 materials which are modified from manganese oxalate and have different morphologies are obtained by adopting the same method. Tests in the application of the Mn<x>Fe<1-x>C2O4 materials in lithium ion batteries show that the reversiblespecific capacity is obviously improved and the cyclic stability is also significantly improved when the Mn<x>Fe<1-x>C2O4 material synthesized in the invention is used as a negative electrode active material, compared with pure-phase manganese oxalate. For example, Mn0. 8Fe0.2C2O4 prepared through doping can remarkably improve the capacity of lithium ion batteries, and shows most excellent cycle performance and rate capability. Therefore, the Mn<x>Fe<1-x>C2O4 is a potential lithium ion negative electrode material.