92 results about "Ferrous Compounds" patented technology

A system and method for tooth whitening are disclosed wherein at least one peroxide-containing gel and at least one transition metal compound-containing gel, particularly at least one lower atomic number transition metal compound, more particularly at least a ferrous compound including gluconate, sulfate, nitrate, acetate or mixtures thereof, are applied to a patient's mouth. Gelling agent is also included. The activation of the peroxide whitens the patient's teeth. The system may be used with or without the application of light. The system further provides an additional gel including a sensitivity reduction compound including potassium nitrate, sodium nitrate or mixtures thereof for possible sensitivity treatment if needed.

The present invention is multifunctional sulfur recovering catalyst with high deoxygenation activity, high organic sulfur hydrolyzing activity and high H2S-SO2 Clausius reaction activity and its preparation process. The catalyst has active components including titania 40-60 wt%, active alumina 35-50 wt% and ferrous compound 5-10 wt%. The catalyst has the advantages of great specific surface area, high mechanical strength, high oxygen leakage poisoning tolerance, high deoxygenation activity, high organic sulfur hydrolyzing activity and high H2S-SO2 Clausius reaction activity. It may be used alone or via matching with common alumina catalyst.

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.

Trace amount levels of heavy metals such as mercury in crude oil are reduced by contacting the crude oil with a sufficient amount of a reducing agent to convert at least a portion of the non-volatile mercury into a volatile form of mercury, which can be subsequently removed by any of stripping, scrubbing, adsorption, and combinations thereof. In one embodiment, at least 50% of the mercury is removed. In another embodiment, the removal rate is at least 99%. In one embodiment, the reducing agent is selected from sulfur compounds containing at least one sulfur atom having an oxidation state less than +6; ferrous compounds; stannous compounds; oxalates; cuprous compounds; organic acids which decompose to form CO2 and / or H2 upon heating; hydroxylamine compounds; hydrazine compounds; sodium borohydride; diisobutylaluminium hydride; thiourea; transition metal halides; and mixtures thereof.

The invention discloses a preparation method of a magnetic biochar adsorbing material for arsenic-cadmium combined pollution remediation. The preparation method comprises the following steps: 1) drying and smashing plant straw as biomass; 2) dissolving ferrous compound and ferric compound into water to obtain ferric salt solution according to a molar ratio of ferric ion to ferrous iron as (1.8 to 2.2) to 1; firstly adjusting a pH value of the ferric salt solution to 11 to 12, then adding the biomass obtained in the step 1), stirring at temperature of 60 + / - 10 DEG C for 2 + / -0.5 hours and finally standing for 22 to 26 hours under a sealed condition, wherein solid-fluid weight ratio of the biomass to the ferric salt solution is 4.5 to 5.5%; 3) drying solid obtained in the step 2), adding calcium carbonate powder of 0.8 to 1.2% of the weight of dried solid and pyrolyzing in 400 + / - 50 DEG C for 2 + / - 0.5 hours under inert gas atmosphere to obtain the magnetic biochar material.

The invention provides a low self-discharge ferrous electrode material. The ferrous electrode material is characterized by consisting of an active substance and an additive, wherein the composition ofthe active substance is ferrum or ferrous compounds including one or more of Fe3O4, Fe(OH)2, Fe(OH)3, Fe2O3, reduced ferrous powder and carbonyl ferrous powder; and the additive comprises: 1) 0.02 to0.15 percent of indium or indium compounds including one or more of In, In2O3, In2(SO4)3, In(OH)3, InCl3 and the like; 2) 2 to 8 percent of stannum or stannum compounds including one or more of Sn, SnO, SnO2, SnCl2, SnCl4 and stannate; 3) 1 to 7 percent of bismuth or bismuth compounds including one or more Bi, Bi2O3, Bi(NO3)3 and the like; and 4) 5 to 10 percent of graphite powder. The ferrous electrode material has the advantages that: 1) no toxic heavy metals (such as Hg, Cd, Pb and the like) are added, so the electrode material is an environment-friendly electrode material 2) the cost foran electrode is quite low; and 3) the self-discharge rate of the electrode is less than 20 percent at a temperature of 20 DEG C after 28 days. The material is used for manufacturing environment-friendly ferrum-nickel storage batteries.

The invention provides a ferrous aluminum and magnesium system refractory raw material which is a multiple solid solution or composite of ferrous aluminate spinel and / or alumina spinel and / or ferromagnesium solid solution and / or pleonaste. The refractory raw material is prepared by the following steps of: mixing a ferrous compound, an aluminum-containing compound and a magnesium oxide-containing compound according to the ratio; additionally adding 1-6 percent bonding agent; mixing, forming and drying a blank; maintaining the mixture in a high-temperature kiln in the nitrogen atmosphere at the temperature of 1,400-1,700DEG C for 2-8 hours; and naturally cooling and taking out the product. In the scheme, the granularities of the alumina-containing raw material and the ferrous raw material are less than 180 meshes. The invention aims at synthesizing the ferrous aluminum and magnesium system refractory raw material with stable performance and avoids the volume effect due to the change of ferrum among different valence states. The method has simple synthesis process and is easy to implement.

The invention relates to Fe3O4 / TiO2 composite nano-particles as well as a preparation method and an application thereof in a magnetic resonance imaging contrast medium. The preparation method of the Fe3O4 / TiO2 composite nano-particles comprises the following steps: dissolving ferric compound and ferrous compound in the aqueous solution of reducing acid; and dropwise adding a titanic salt solutioninto the solution so as to prepare the sol of Fe3O4 / TiO2 composite nano-particles after the reaction. Compared with the prior art, the preparation method of Fe3O4 / TiO2 composite nano-particles provided by the invention is simple to operate and low in preparation cost, and does not need N2 (nitrogen) protection during the reaction; and the product has the advantages of uniform particle size distribution, controllable size, good water solubility and biocompatibility, no toxicity and the like. As the Fe3O4 / TiO2 composite nano-particles prepared by the preparation method provided by the inventionare a composite nano-material with superparamagnetism and optical catalytic activity, the Fe3O4 / TiO2 composite nano-particles can be applied to the magnetic resonance imaging contrast medium.

The invention provides preparation and recovery methods for a magnetic clay adsorption material. The preparation process comprises adding a strong base substance into an aqueous solution of a mixture of inorganic ferric / ferrous compounds under the circumstances of nitrogen protection and sufficient stirring, so as to prepare a magnetic nanoparticle; adding an ethanol solution of a surfactant into an aqueous solution of the prepared magnetic nanoparticle, and fully stirring and mixing for reaction; fully mixing a bentonite suspension fully swelled by water with the surface-functionalized magnetic nanoparticle for reaction; and performing sufficient magnetic separation on the reaction product and washing off superfluous metal and nonmetal ions, so as to obtain the magnetic clay material. The magnetic clay material adsorbing dye pollutants can be reestablished and reused through gamma radiation of a 60 Co radioactive source. The provided preparation method is simple, and the prepared magnetic clay absorption material is convenient to use, high in adsorption efficiency, and repeatedly reusable.

The invention discloses a preparation method of nano spherical ferric phosphate as well as nano ferric phosphate prepared by the method, lithium ferric phosphate and a lithium battery. The method comprises the following steps: mixing: dropwise adding a mixed solution consisting of a phosphorus source compound solution and an oxidant solution into a soluble ferrous compound solution, adding a nano spherical control agent, and stirring and mixing; reacting: stirring at 50 to 100 DEG C under a refluxing condition, and reacting for 5 to 10 h; filtering: magnetically filtering the mixed solution after the reaction by adopting a high magnetic filter, press filtering the filtered solution, and obtaining a ferric phosphate crude product; and calcining: calcining for 24h at 650 to 850 DEG C under the protection of inert gas, and cooling to obtain a final ferric phosphate product. By adopting the method, the morphology of the ferric phosphate product can be controlled, and the performance of the lithium ferric phosphate can be improved.

The invention relates to preparation of a ferrous compound in a polyhydroxy structural state and an application of the ferrous compound in wastewater reduction pretreatment. The preparation method comprises the following steps: dissolving a certain amount of ferrite in water without dissolved oxygen; and then gradually dropping oxygen-free alkaline solution in the obtained solution while stirringcontinuously, and generating structural state ferrous hydroxy complex (FHC) by controlling the molar ratio of ferrous ions to hydroxyls. The FHC prepared by the invention has high reduction activation and high reaction rate with pollutants and can fast reduce and convert harmful and poisonous pollutants in wastewater; and dissolved ferrous state is converted to structural ferrous state so as to obviously increase the reduction performance of the ferrous state. The FHC is used in the wastewater reduction pretreatment; and the scope of application of pH is wide, and the FHC has good effect whenthe pH value is 4-10. In addition, the FHC is more convenient to add compared with catalyzed iron filler; the wastewater treatment process is easy to operate, manage and maintain, and the cost is low; and the FHC is suitable for the large-scale reduction pretreatment of industrial wastewater.

A method for simultaneously removing ammonia nitrogen and nitrate nitrogen from a water body is disclosed. The method includes subjecting the water body containing ammonia nitrogen and nitrate nitrogen to oxidation-reduction treatment by adopting an iron catalyst under functions of anaerobic ammoxidation microbes, iron autotrophic denitrification microbes and iron-reduction ammoxidation microbes.The iron catalyst includes one or a plurality of elementary iron, a ferrous compound and a ferric compound. The catalytic treatment is performed in an anaerobic environment. The anaerobic ammoxidationmicrobes, iron autotrophic denitrification microbes and iron-reduction ammoxidation microbes provide reaction functional microbes for anaerobic ammoxidation, iron autotrophic denitrification and iron-reduction ammoxidation, allow oxidation-reduction treatment of the ammonia nitrogen and nitrate nitrogen to be performed stably and continuously under the premise of not continuously adding the catalyst, and can completely convert the ammonia nitrogen and nitrate nitrogen into nitrogen without a byproduct. The method is free of secondary pollution.

The invention relates to a method for making novel flavored preserved eggs, which comprises the following steps: dissolving carrageenin, soy protein, calcined soda, zinc compounds and ferrous compounds in water according to the proportion, evenly stirring, pouring into a fresh egg fluid, and adding table salt, monosodium glutamate, edible oil and tea dust; filtering, removing residues in the egg fluid, and standing at the temperature of 0-25 DEG C; pouring the evenly mixed fluid into a non-stick mold, and molding by adjusting the pH value (the pH value is 4-6 or 8-11) and the temperature (the temperature is 60-121 DEG C), thereby obtaining protein gel with favorable elasticity and hardness; taking the molded material out of the mold, and cutting into egg blocks with different shapes and sizes according to needs; vacuumizing and then packaging the produced material; sterilizing the vacuumized product with microwaves or high temperature; and cooling the sterilized product, attaching labels, printing codes and filling into boxes, thereby obtaining the finished product.

The invention provides a preparation method of a graphene filter composite membrane. The preparation method comprises the following steps of: filtering carboxylated graphene oxide to a membrane supporting layer by means of a suction filtration method or a cross flow filtration method to form a composite membrane supporting layer; and filtering a ferric chloride solution by using the formed composite membrane supporting layer, and performing reduction to form an electro-Fenton catalytic layer comprising a ferrous compound to prepare the graphene filter composite membrane. As the electro-Fenton catalytic layer comprises the ferrous compound which has a certain interception performance on refractory pollutants and can decompose the refractory pollutants in situ, the problem that the toxicity of the refractory pollutants cannot be reduced by means of a membrane technology is solved, and the membrane pollution is alleviated. Meanwhile, as the membrane supporting layer is arranged below the electro-Fenton catalytic layer, and in a process of filtering secondary effluent, the refractory pollutants can be enriched to a certain degree, so that the degrading rate of the electro-Fenton catalytic layer on the refractory pollutants can be further increased.

The invention discloses a preparation method of a positive pole lithium iron phosphate / carbon composite material for a low-temperature battery. The preparation method comprises the following steps: by adopting a ferrous compound as a raw material, and weighing the ferrous compound, a lithium compound and a phosphorus compound according to the mole ratio of Fe:Li:P=(0.98-1):(1-1.02):1; respectively dissolving or dispersing in deionized water; adding to a liquid-phase reducing agent with moderate volume according to a certain sequence; carrying out reflux reaction at specific temperature; carrying out solid-liquid separation to obtain lithium iron phosphate precursor; then calcining under the protection of inert gas to prepare the LiFePO4 / C composite positive pole material. Compared with other methods, the preparation method disclosed by the invention has the advantages of simple process equipment, moderation in condition, completeness in precursor crystallization, great shortening of high-temperature calcination time, great reduction of energy consumption, fine lithium iron phosphate particle diameter and more excellent normal-temperature discharge property and low-temperature charge-discharge property.

The invention relates to a method for preparing magnetic SBA-15, which comprises the following steps: 1) dissolving a ferrous compound in water by stirring under dark conditions, adding P123 and TEOS (tetraethyl orthosilicate), and stirring; 2) transferring the reaction product and mother solution into polytetrafluoroethylene to carry out hydrothermal crystallization; and 3) cooling, filtering, drying, and calcining to obtain the end product. In the method, the ferrous chloride water solution is an acidic solution, the P123 can be dissolved more quickly in the acidic solution, and the TEOS can be hydrolyzed under such acidic conditions; and therefore, no additional acid source in the public known technique is needed, so no acidic waste liquid can be generated.

The invention discloses an electrolyzing solution, method and application for micro-arc oxidation. The electrolyzing solution for micro-arc oxidation comprises phosphates with the final concentration being 5-50 g / L, iron containing compounds with the final concentration being 1-15 g / L and complexing agents with the final concentration being 1-10 g / L, and distilled water serves as solvents. The iron containing compounds are ferrous compounds and / or ferric compounds. According to the electrolyzing solution for micro-arc oxidation, the phosphates, the iron containing compounds and the complexing agents are dissolved in water, not only is the using requirement of the electrolyzing solution for the micro-arc oxidation met, but also the phosphates subjected to phosphating are introduced into the electrolyzing solution, and phosphating and the micro-arc oxidation are combined, so that an obtained film layer subjected to the micro-arc oxidation through the electrolyzing solution has better density, and accordingly corrosion resistance performance of a treated workpiece is improved.

The invention relates to ferrous ion reduction and catalytic oxidation cooperation for reinforcing waste water biological treatment technology, and is suitable for processing difficultly degraded industrial waste water, the waste water biological treatment technology comprises four steps of preparation of a structural state ferrous compound, reduction treatment, catalytic oxidation treatment and biochemical treatment. Compared with the prior art, the ferrous reduction function can be fully performed, simultaneously, the catalysis performance of the ferrous reduction product can be further used, a few of hydrogen peroxide and a reinforcement material can be added, catalytic oxidation is carried out to remove a part of difficultly degraded pollutant, waste water biodegradability is further enhanced, the biological treatment technology can be coupled, so that the thorough treatment of waste water is realized. The waste water biological treatment technology has the advantages of wide water quality adaptation scope, high efficiency economy and simple utility.

The invention relates to a preparation method of rare earth compound doped lithium ferrous silicate cathode material. The preparation process includes the following steps: reactants of lithium compound, ferrous compound, rare earth element compound and silicon compound are weighed according to the mol ratio that lithium ion: ferrous ion: rare earth element ion: silicon ion is equal to (1.90-2.05): (1-y): z: 1, and a certain amount of carbon containing compound is added. Silicon compound and hot water or ethanol water are mixed, lithium compound is added, stirring and mixing are carried out, the other reactants and carbon containing compound are added, and vacuum drying is carried out. The dried powder is used for preparing lithium ferrous silicate by adopting two-stage sintering method. Discharging capacity of the prepared material at 3.0V region is obviously improved, and cycle performance at 0.3C current is good, thus laying good foundation for industrialization.

The present invention discloses a composition for a desulfurizer with a high sulfur capacity and a process for making the same. The composition comprises the active components of three kinds of iron oxides and is used in the desulfurizer to remove hydrogen sulfide from the gaseous and liquid state feed stocks. The process for preparing the composition comprises the following steps: (1) mixing a solid ferrous compound with a solid hydroxide at a molar ratio of iron to hydroxyl being in the range from 1:2 to 1:3; (2) kneading the mixture feeds obtained in step (1) and making them react completely; (3) drying the products obtained in step (2) in the air; (4) washing and filtering the feeds obtained in the step (3); (5) naturally drying or baking the solids obtained in step (4) to form a composition for a desulfurizer with a high sulfur capacity.

The invention relates to a three-layer nuclear-shell lithium-ion battery positive composite material which comprises a spherical lithium iron phosphate inner layer, a carbon layer which wraps the lithium iron phosphate inner layer, and a silicon dioxide layer which wraps the carbon layer. The preparation method of the composite material comprises the following steps of: mixing and dissolving a lithium compound, a ferrous compound and a phosphorous compound for mixing with a template guiding agent and a carbon source, the mixture, and placing the mixture after ultrasonic dispersing into a water heating kettle for reaction under inert gas; washing reactants respectively through deionized water and absolute ethyl alcohol, and drying the reactants to obtain a spherical precursor; adding the spherical precursor under the protection of nitrogen into an alcohol aqueous solution, and then adding TEOS (tetraethyl orthosilicate) for reaction to obtain turbid liquid; filtering the turbid liquid, and drying in a spraying manner to obtain the composite material. In the synthesis process of the material, the template guiding agent is adopted, so that the three-layer nuclear-shell lithium-ion battery positive composite material with a uniform spherical shape, high compactness density and an excellent electrochemical performance can be obtained.

The invention discloses a method for preparing potassium permanganate-doped potassium ferrate. The method comprises the following steps: firstly, mixing a ferrous compound and a stabilizer by the proportion of Fe and the stabilizer; secondly, dissolving the mixture in a potassium hydroxide solution; thirdly, stirring, adding an oxidizer to the potassium hydroxide solution by a certain proportion of Fe and the oxidizer at the temperature controlled within a certain range, reacting for a certain time, separating the purple suspended solid product prepared from the reaction, decompressing and filtering; fourthly, mixing the purple solid product with the mixed solution of potassium hydroxide and potassium permanganate in a certain proportion, stirring and separating the purple solid to obtain the purple solid product; and fifthly, rinsing the purple solid product with cyclohexane, absolute alcohol and ether respectively, decompressing and filtering, and vacuum drying until the weight is constant to obtain the potassium ferrate solid. The invention has the advantages that the purity of synthesis is high, the thermal stability of the synthesis is high, the purity of potassium ferrate is higher than 98%, the content of the potassium ferrate is higher than 96%; the obtained potassium ferrate has good electrochemical performance; and the conservation rate of the charge / discharge cycle discharge capacity is up to 90.5%.

The invention discloses an iron oxide pigment and its production method. The method includes steps of 1) preparing reaction fluid, wherein the reaction fluid contains complexing agent and inert gas and its pH value is 7.0-13.0; adding scrap iron or ferrous compound or ferric ion compound therein; after dissolving, separating impurities to obtain iron solution; 2), charging oxygen gas in the iron solution so that the ferric ion in the iron solution is oxidized to be iron oxide yellow, iron oxide red or iron oxide black sediment; separating to obtain iron oxide pigment and reaction mother liquor, wherein the complexing agent is one or two of methylamine, ethylamine, ethylenediamine, propylene amide, ethanolamine, imidazole, diethylenetriamine, triethylenetetramine, ethylenediamine tetraacetic acid, ethylene diamine diacetate, nitrilotriacetic acid, glutamic acid, valine, histidine, proline, aspartic acid, alanine, serine, phenylalanine, arginine, threonine, glycine, lysine, asparaginate and glutamine.

The invention provides a superparamagnetic nano-particle, a preparation method of the superparamagnetic nano-particle and application of the superparamagnetic nano-particle. A ferrous compound and a ferric compound are reacted with an aqueous alkali, a water-soluble citrate compound serves as a modifier, and the ferroferric oxide superparamagnetic nano-particle with the surface wrapped by the water-soluble citrate compound is obtained by a co-precipitation method. A nucleating stage and a growing stage of ferroferric oxide particles are effectively separated, and the superparamagnetic nano-particle which is small and uniform in particle size and good in dispersibility is obtained; the water-soluble citrate compound is used for modifying the surfaces of the ferroferric oxide nano particles, so that the stability and the biocompatibility of the superparamagnetic nano-particle in a human body are improved. A stable dispersion system is formed by dispersing the superparamagnetic nano-particle in an aqueous solution, a superparamagnetic contrast agent is obtained, and the contrast agent can perform magnetic resonance imaging in a pathological tissue of myocardial infarction.

The invention provides a method for removing boron and phosphorus impurities in industrial silicon by ferrous compounds; the method comprises the following steps: selecting FeR (Fe2O3, Fe (OH) 3, Fe3O4 and the like)-SiO2-CaF2 as main components of slag forming agent, greatly increasing the distribution coefficient ratio of metal slags by combining a new process flow to lead the removal rate of boron to reach more than 95% and the removal rate of phosphorus to reach more than 90%. After the completion of slag forming, the directional solidification process is needed to be carried out so as to purify industrial silicon to form solar-grade polycrystalline silicon. The method has the characteristics of low cost and low energy consumption, is easy to operate, and is suitable for industrial production.

A method for removing elements, including heavy metals, from fly ash and from fly ash resulting from removal of SOx / NOx from flue gas using Na2CO3 / NaHCO3 / trona, is described. An aqueous suspension of the fly ash and / or a solution of the leachate from the fly ash is treated with dissolved ferrous compounds, such as FeSO4.7H2O and / or FeCl2.4H2O, at a chosen initial acidic pH, and the precipitation of the ferrous ions as the solution basifies sequesters the trace elements.

The invention discloses a spin crossover-upconversion nano composite material as well as a preparation method and application thereof, and belongs to the field of spin crossover complex materials. Thespin crossover-upconversion nano composite material is formed by combining a spin crossover complex and an upconversion nano luminous material through a coordination bond, and a structural formula isUCNPs@SCO, wherein SCO is the spin crossover complex; the spin crossover complex is an active functional group-containing single-core ferrous compound; UCNPs is the upconversion nano luminous material for exploring regulation and control of a spin crossover behavior by near infrared excitation. The method is easy to operate and mild in condition and can realize low-energy photoinduced spin crossover behavior at a solid-state unimolecule level; the material is applied to molecular electronic appliances related to information storage, molecular switching and molecular displaying.

A system and method for tooth whitening are disclosed wherein at least one peroxide-containing gel and at least one transition metal compound- containing gel, particularly at least one lower atomic number transition metal compound, more particularly at least a ferrous compound including gluconate, sulfate, nitrate, acetate or mixtures thereof, are applied to a patient's mouth. Gelling agent is also included. The activation of the peroxide whitens the patient's teeth. The system may be used with or without the application of light. The system further provides an additional gel including a sensitivity reduction compound including potassium nitrate, sodium nitrate or mixtures thereof for possible sensitivity treatment if needed.

The invention relates to a preparation method for a ferrous silicate lithium cathode material simultaneously doped with fluorine and zirconium, which is characterized by comprising the following steps of: weighing a lithium compound, a ferrous compound, a zirconium compound, a silicon compound and a fluorine compound as reactants in accordance with the molar ratio of lithium ion to ferrous ion to zirconium ion to silicon ion to fluorine ion being (1.90-2.05): (1-y): x: (1-z): k; weighing a carbon-containing compound or carbon powder based on 1-30 percent of total mass of the reactants; mixing the silicon compound with hot water, adding the lithium compound, then mixing all other reactants and the carbon-containing compound or the carbon powder, carrying out ball mill mixture process and vacuum drying to prepare dry powder; and placing the dry powder in an inert atmosphere or a weakly reducing atmosphere, and then preparing ferrous silicate lithium through the two-stage sintering process. The cycle performance of the prepared material is excellent in the 1C-rate current, and a good foundation can be built for industrialization.