308 results about "Ferric iron compound" patented technology

The invention relates to a preparation method and applications of a catalyst which is used for preparing light olefin from synthesis gas directly and co-preparing gasoline. The preparation method comprises following steps: a molysite is taken as a precursor, and then the catalyst is obtained by pre-treatment with a carbon source, dispersion-mixing and modified vapor deposition which are all simple and easy to operate, wherein an iron-containing compound is taken as the active center of the catalyst, and the catalyst can be used for direct conversion of synthesis gas to light olefin and co-preparing of gasoline. Catalytic activity and economic cost of the catalyst enable that the catalyst can be applied in industrial production.

The invention relates to an environmental-friendly comprehensive utilization method for a laterite-nickel ore, which comprises the following steps of: (1) grinding the laterite-nickel ore, mixing with sulfuric acid, roasting, dissolving out roasted clinker and filtering to obtain silicon dioxide and dissolution liquid; (2) deironing the dissolution liquid to obtain liquid No.2 and filter residue (iron compounds), wherein the liquid No.2 comprises aluminum, nickel and magnesium and can be treated by the step (3) or (4); (3) precipitating the aluminum in the liquid No.2 by using alkali, filtering, precipitating the nickel in filtrate by using sodium sulfide, filtering, precipitating the magnesium by using the alkali, and treating filter residue to obtain aluminum oxide, nickel hydroxide, nickel sulfide and magnesium oxide respectively; and (4) precipitating the aluminum and the nickel in the liquid No.2 by using the alkali, treating mixed slag containing the aluminum and the nickel by using the alkali to obtain aluminum hydroxide and nickel hydroxide products, and precipitating the magnesium in filtrate subjected to aluminum and nickel precipitation by using ammonia or ammonium saltto obtain a magnesium oxide product. The method is suitable for treating various laterite-nickel ores, three wastes (waste gas, waste water and waste residue) are not generated, and valuable components magnesium, nickel, iron, aluminum and silicon in the laterite-nickel ore are separated and extracted.

The present invention relates to Fe-Al spinel and its preparation process. The technological scheme of the present invention is the Fe-Al spinel preparing process including the steps of: mixing Al containing compound and Fe containing compound in the molar Al/Fe ratio of 2 and adhesive in 1-6 wt% for 5-180 min; forming and drying at 90-120 deg.c for 20-30 hr; heating in carbon atmosphere and temperature raising speed of 0.5-10 deg.c/min at 1100-1700 deg.c for 5-600 min; and naturally cooling. The present invention has the advantages of simple technological process, low reaction temperature and cheap material. Under the sintering temperature, all the Al and Fe components are converted into FeAl2O4, and the sintered product has apparent porosity lower than 5 %.

The present invention is directed to the selective removal of ferric ion and/or ferric compounds from valuable metal recovery process streams.

The invention relates to a method for synthesizing ferrous aluminum spinel, belonging to the technical field of fireproofing materials. The method comprises the following steps of: mixing ferrous compound and aluminiferous compound according to the mol ratio of Fen<+> to Al<3+> of 1:2, additionally adding a binding agent accounting for 1-6 percent of the weight of the mixture, mixing, pressing, drying and sintering under the nitrogen atmosphere at the temperature of 1300-1700 DEG C, and keeping the temperature for 2-12 hours. The invention has the advantages of high synthetic purity, simple process and easy actualization.

Disclosed is a process for production of a carboxylic acid ester from a carboxylic acid and an olefin or production of an ether compound from an alcohol and an olefin at low cost and with high yield in an industrially advantageous manner. The process comprises the step of reacting a carboxylic acid with an olefin to yield a corresponding carboxylic acid ester or reacting an alcohol with an olefin to yield a corresponding ether compound. In the process, a catalyst comprising a combination of (i) at least one metal compound selected from an iron compound, a cobalt compound and a nickel compound and (ii) an acidic compound is used.

The invention relates to a double-layer sustained release tablet for supplementing iron, the double-layer sustained release tablet consists of a sustained release layer and a quick release layer laminating with each other at the weight ratio of 1:0.25-1:4; the sustained release layer consists of an iron-containing compound, a sustained release framework, an adhesive, a lubricant and a filler; the quick release layer consists of a traditional Chinese medicine for enriching the blood and/or invigorating vital energy, a filler, a disintegrating agent, an adhesive and a lubricant; the quick release layer can also be added with vitamins. In the double-layer sustained release tablet, by arranging the iron-containing compound in the sustained release layer and the traditional Chinese medicine in the quick release layer, the iron element is released slowly and uniformly, which increases the absorption rate, avoids gastrointestinal reaction caused by high-content iron; meanwhile the double-layer sustained release tablet supplements iron element and the traditional Chinese medicine which has the functions of enriching the blood and invigorating vital energy, thus fully improving the nutritional status caused by iron deficiency anemia and improving iron supplementing effect.

This invention relates to a kind of anode material and method used for reducing preparation of lithium iron phosphate by vacuum carbon. It uses cheap phosphate, iron compound and lithium compound as raw material, compound of cheap heavy metal as adulteration modifying agent, cheap and abundant activated carbon, acetylene black and graphite as reducing agent. Dealing with it using ball milling techniques and makes solid-phase chemical reaction under the vacuum condition, then get the anode material adulterating lithium iron phosphate which contains carbon. Lithium iron phosphate compounded in this invention has a stable performance, physical chemistry of products has a good homogeneity and consistency and a high productivity; lithium iron phosphate produced in this invention has a high tap density and electric specific votume, good discharging capability of high-current, stable electrochemistry circulation capability, and low local action, besides, it is easy to control content of tantalum adulterated. The tap density of lithium iron phosphate produced by this method is 1.63-2.04g/cu cm, the highest discharging specific votume is 161.3mAh/g.

The invention discloses a carbon-nanotube-loaded multi-stage nanometer ferroferric oxide adsorbent and a preparation method and application of the carbon-nanotube-loaded multi-stage nanometer ferroferric oxide adsorbent. The adsorbent comprises a carbon nanotube and multi-stage nanometer ferroferric oxide loaded on the carbon nanotube, wherein the ferroferric oxide has the grain size of 30 to 80 nanometers and mass fraction of 25 to 35%. The preparation method of the adsorbent comprises the following steps in sequence: mixing the oxidized carbon nanotube with an organic reducing agent and an organic iron compound; transferring the mixture into a reacting kettle; thermally synthesizing through an in-situ solvent in an oil bath under an inert atmosphere at reaction temperature of 180 to 270 DEG C and pressure of 0.1 to 2.0 MPa; cooling the reacting product; washing; and drying in vacuum to obtain carbon-nanotube-loaded multi-stage nanometer ferroferric oxide adsorbent. The carbon-nanotube-loaded multi-stage nanometer ferroferric oxide adsorbent disclosed by the invention is high adsorbing performance and easy to separate and recovery; and the preparation method is simple and low in cost, and has a wide application prospect in the field of adsorbing heavy metal ions and organic pollutants from the wastewater.

The invention discloses a method for preparing nano ferrate in a fused salt manner. The method comprises the following steps of grinding and uniformly mixing a divalent metal compound serving as a raw material, a ferric iron compound serving as a raw material, sodium chloride serving as fused salt and potassium chloride as fused salt, putting the mixture in a crucible, putting the crucible into a tubular furnace, and roasting for 4-6 hours at 800-880 DEG C, and carrying out aftertreatment to obtain nano ferrate, wherein the mole ratio of the raw materials to the fused salt is 3:11y and y is not less than 0.6 and not larger than 50; the mole ratio of the divalent metal compound to the ferric iron compound is x:3-x and x is not less than 0.01 and not larger than 1; and the mole ratio of sodium chloride to potassium chloride in the fused salt is 10:1. The method for preparing nano ferrate in a fused salt manner, disclosed by the invention, has the advantages of simpleness in equipment, short reaction time, low energy consumption, environment friendliness, low cost and product diversity, and is suitable for industrial production.

The invention discloses an in-situ oxidation medicine and a pollution soil in-situ oxidation remediation method. The in-situ oxidation medicine comprises components sodium persulfate, calcium oxide, an iron-containing compound, a surfactant and a cosolvent according to the weight ratio of (60-70):(20-30):(10-15):(5-10):(1-5). The mediation method comprises the following steps: (1) dividing a pollution area; (2) arranging points and drilling wells; (3) preparing a medicine; (4) injecting the medicine. By adopting the pollution soil in-situ oxidation remediation method, the problems can be solved. The in-situ oxidation medicine and the pollution soil in-situ oxidation remediation method are easy to operate, the time and labor can be saved, and an address structure is not damaged.

The invention provides a lithium-ion battery anode material with compound cladding modification and high tap density and a preparation method thereof and an application thereof to the manufacturing field of lithium-ion batteries. The material of the invention consists of carbon, Fe2P and lithium iron phosphate. The carbon and the Fe2P form a conductive nanometer network to compound and clad the lithium iron phosphate particles so as to form the LiFePO4/(C+Fe2P) compound material. The lithium-ion battery anode material of the invention takes the mixture of an organic ferric iron compound and an inorganic ferric iron compound as an iron source, and is mixed with the compound of the lithium source and the phosphorous source, and makes use of a solid phase-carbon thermal reduction method to prepare the material. The preparation method of the invention is relatively simple and practicable, the price of the raw material is relatively cheap, the production cost is relatively low, and the prepared material has good electrochemical performance, high tap density and is suitable for industrialized production.

The invention discloses a production method of ammonium ferric citrate. The ammonium ferric citrate is prepared by water, citric acid and iron powder according to the following steps: 1. placing water and citric acid into a stirring device to be heated to 60 DEG C; 2. opening the stirring device, adding the iron powder, slowly heating to 80 DEG C, keeping the temperature, stirring and reacting to generate ferrous citrate; 3. cooling the ferrous citrate obtain in step 2 to 40 DEG C, adding hydrogen peroxide for oxidizing until no ferrousion exists; 4. introducing ammonia to neutralize the ferrate compound obtained in step 3 to the pH value more than or equal to 7, filtering, removing impurities and concentrating to be in a pasty shape; and 5. placing the concentrated matter obtained in step 2 into an oven for drying at the temperature of 80 DEG C. The invention has the advantages of adopting the iron powder to replace ferrous sulphate, using the hydrogen peroxide as oxidant and adopting scientific proportioning and production process, thus avoiding chloridion and sulfate ion and other impurities from being carried in, preventing from generating ferric hydroxide intermediate products which are difficult to dehydrate and wash, greatly simplifying production processes, reducing production cost and improving production efficiency of the ammonium ferric citrate.

The invention relates to a preparation method of lithium iron phosphate, an active substance applied in the anode of lithium-ion secondary batteries. The method comprises the step that a mixture that contains lithium compound, iron compound, phosphorus compound, carbon source additive, water and dispersant is dried and sintered; wherein, the lithium compound, the phosphorus compound and the carbon source additive are compounds that are water soluble, while the iron compound is undissolved or insoluble in water; the dispersant is water soluble and has higher boiling point than water. The lithium iron phosphate acquired by the method has even distribution of crystal particle size, high specific capacity of initial discharge and good cycling performance.

The invention discloses a surface treatment method of a powder metallurgy part. The method comprises the following steps of: firstly, performing complex cementation on the powder metallurgy part with nitrogen gas, sulfur gas and chromium gas to form a dense coating tissue of a nitrogen-sulfur-chromium compound with the size of between 15 microns and 45 microns on the surface of the powder metallurgy part; secondly, polishing the surface of the powder metallurgy part; and lastly, oxidizing the powder metallurgy part at low temperature to form a dense oxide layer. The compound coating tissue is a dense oxide layer covered by a polynary ultra-hard nitrogen-sulfur-chromium compound, so that the powder metallurgy part has high wear resistance, corrosion resistance and high temperature resistance, the friction coefficient is greatly lowered, the seizing resistance magnitude order is raised, the working quality of the powder metallurgy part is remarkably enhanced, and the service life is prolonged.

The invention relates to a preparation method and application of a nanoscale zero-valent iron-beta zeolite new composite nano material, an iron source is Fe<2+> or Fe<3+> iron containing compounds (such as anhydrous ferric chloride, ferrous sulfate, and the like), and a loading base is beta zeolite with total ion exchange capacity. The preparation is characterized in that a loading base material is fully dispersed and iron ions and the loading base are uniformly combined through the long time reaction under ultrasonic synergistic effect, free iron ions in the solution are removed by centrifugation, the iron-containing solution is recycled, the homogeneity of the properties of the synthetic material system is enhanced, iron ions absorbed on the loading base surface are reduced under the function of sodium borohydride, and anhydrous ethanol is used for cleaning and storage. The preparation method has the advantages of being low in cost, convenient, fast, low in technical threshold, and in favor of the popularization and promotion, and nano zero valent iron particles in the synthetic material are smaller, is not easy to agglomerate and have very good removal effect on heavy metal pollutant stibonium and the like difficult to remove in the environment.

The invention relates to a preparation method of lithium iron phosphate, an active substance applied in the anode of lithium-ion secondary batteries. The method comprises that a mixture that contains lithium compound, iron compound, phosphorus compound and carbon source additive is sintered and cooled to get a sintering product; wherein, the iron compound is ferric iron compound; the sintering method comprises the step: the mixture that contains lithium compound, iron compound, phosphorus compound and carbon source additive is sintered at a first constant sintering temperature, then a mixture of the product acquired at the first sintering temperature and the carbon source additive is sintered at a second constant sintering temperature, and the second sintering temperature is at least 80 DEG C higher than the first sintering temperature. Batteries made of the lithium iron phosphate acquired by the method of the invention have both high capacity and good discharge performance at high current.

The invention relates to a carbon-free nanoscale lithium iron phosphate and a preparation method thereof. The carbon-free nanoscale lithium iron phosphate is prepared by mixing a lithium compound, an iron compound, a phosphorous compound and a doped element compound according to a molar ratio so as to form a mixture A; and the mixture A and a complexing agent are mixed and dissolved in a solvent to form the lithium iron phosphate with a nanoscale grain size. The preparation method comprises the following steps: mixing the mixture A and the complexing agent to form a mixed material; ball milling and drying the mixed material to obtain a powder material; pulverizing the obtained powder by pulverizing equipment and then sintering the powder in an oxidized atmosphere furnace to obtain an oxidized carbon-free nanoscale lithium iron phosphate powder material; and treating the obtained powder material in a reducing atmosphere furnace to obtain carbon-free nanoscale lithium iron phosphate powder. The carbon-free nanoscale lithium iron phosphate has the grain size of 30-500nm, a specific surface area of 1-50m<2>/g and tap density of 0.7-2.5g/cm<3>, has fine and even grain and high purity and does not contain carbon materials. Because doped elements are added, the electrochemical performance is enhanced. The preparation method has simple process and easy realization of industrialization.

The invention discloses a processing method for resource recycling and zero discharge of steel hydrochloric acid pickling waste liquid. The method adopts the process steps of carbide slag neutralization and pre-oxidation, air oxidation, heating synthesis, press filtration, filtrate circulation and concentration, acid gas absorption and the like so as to prepare high-iron-content magnetic iron compounds and liquid calcium chloride. The method disclosed by the invention takes industrial waste, namely carbide slag, as a raw material for processing steel hydrochloric acid pickling waste liquid, controls reasonable process parameters for recycling magnetic iron compounds which can be used for replacing iron ore powder in the iron industry, have the iron content of 52-62% and meet the iron ore powder standard as well as liquid calcium chloride which meets the 'GBT26520-2011' standard, and realizes the zero discharge of pollution control in steel enterprises. Moreover, the method is simple and stable, strong in operability, little in water consumption and low in energy consumption, greatly reduces the processing cost, and is particularly suitable for processing the steel pickling waste liquid in medium and small-sized enterprises.