2395 results about "Iron salts" patented technology

The invention discloses a precipitation method for preparing nanometer level iron phosphate lithium coated with carbon. The method comprises the following steps: firstly, weighing iron salt, deionized water and a compound of metallic elements; after the stirring and the mixing are performed, adding a phosphorous compound and citric acid diluted with water to the mixture; after the stirring is performed again, adding a precipitation agent to the mixture and controlling to the neutrality; stirring to react in a container, and after the static placement, respectively adding the deionized water, a carbon source and lithium salt to mix uniformly after the precipitate is filtered and washed; stirring again to react, and drying the water at 30 to 160 DEG C and warming up at the heating rate under the protection of non-oxidized gas after a product is crashed; baking at a constant temperature of 450 to 850 DEG C, cooling down to a room temperature at a cooling rate or with a stove, and finally obtaining the nanometer level ferric phosphate lithium coated with the carbon after crashing is performed. The precipitation method has the advantage that the raw material cost and the processing cost are low because bivalent iron is taken as the raw material. The iron phosphate lithium prepared by using the process has the characteristics of good physical processing performance and good electrochemistry performance, and is suitable for industrialized production.

The invention discloses a method for preparing magnetic biological carbon adsorbing material and the usage thereof. The method comprises the steps: 1) drying and crushing waste biomass, and sieving by20-100 meshes; 2) putting the sieved biomass into 0.1-0.5mol/L of iron salt solution with the weight percent of the biomass being 1-10% of the total quantity; under stirring, dripping 3-6mol/L of NaOH solution until the pH value of the solution is 9-10; 3) filtering, drying and compacting the solid precipitate, and then limiting oxygen carbonizing for 1-5h at the temperature of 100-700 DEG C, thus obtaining the magnetic biological carbon adsorbing material; 4) putting the magnetic biological carbon adsorbing material into waste water, and simultaneously removing organic pollutant and phosphate radical in the waste water. The method realizes synchronization of preparation of the adsorbing material and the process of magnetization, and is simple in preparation process, rich in the source ofthe biomass material and low in cost; furthermore, the prepared magnetic adsorbent is covered by biological carbon or embedded with magnetic nano Fe3O4 granules, has special structure and stable existence, can effectively remove the organic pollutant and phosphate in the waste water, and is easy for magnetic separation.

A Selective Catalytic Reduction (SCR) catalyst was prepared by slurry coating ZSM-5 zeolite onto a cordierite monolith, then subliming an iron salt onto the zeolite, calcining the monolith, and then dipping the monolith either into an aqueous solution of manganese nitrate and cerium nitrate and then calcining, or by similar treatment with separate solutions of manganese nitrate and cerium nitrate. The supported catalyst containing iron, manganese, and cerium showed 80 percent conversion at 113 degrees Celsius of a feed gas containing nitrogen oxides having 4 parts NO to one part NO₂, about one equivalent ammonia, and excess oxygen; conversion improved to 94 percent at 147 degrees Celsius. N₂O was not detected (detection limit: 0.6 percent N₂O).

The invention discloses a method for preparing iron lithium phosphate by recovering water-system waste lithium-ion power batteries, comprising the following steps: 1) cutting and brushing a water-system waste lithium-ion power battery, processing by deionized water, sieving and drying to recover the mixture of an electrode material and a conductive agent; 2) adding inorganic acid to the dried mixture of the electrode material and the conductive agent to process, filtering to obtain acid solution containing Li+, Fe2+ and PO43-; 3) adding lithium salt or iron salt to the acid solution containing Li+, Fe2+ and PO43-, adding ascorbic acid and stirring, controlling the pH value to equal to 3-7, and filtering to obtain precipitation; and 4) adding the crude product LiFePO4 obtained in step 3) to a water solution of cane sugar for ball milling, drying and calcining to obtain a regenerative LiFePO4 material. The method has low cost, simple operation and no secondary pollution.

The present invention is directed to the production of nanostructures, e.g., single wall carbon nanotubes (“SWNT”) and/or multi-wall carbon nanotubes (“MWNT”), from solutions containing a polymer, such as polyacrylonitrile (PAN). In particular, the invention is directed to the production of nanostructures, for example, SWNT and/or MWNT, from mixtures, e.g., solutions, containing polyacrylonitrile, polyaniline emeraldine base (PANi) or a salt thereof, an iron salt, e.g., iron chloride, and a solvent. In one embodiment, a mixture containing polyacrylonitrile, polyaniline emeraldine base or a salt thereof, an iron salt, e.g., iron chloride, and a solvent is formed and the mixture is electrospun to form nanofibers. In another embodiment, the electrospun nanofibers are then oxidized, e.g., heated in air, and subsequently pyrolyzed to form carbon nanostructures.

Disclosed herein are antimicrobial compositions comprising an effective concentration of a metal salt combined with a plant extract. In some embodiments the composition comprises a copper salt and/or an iron salt and/or a nickel salt and/or a cobalt salt; and an extract of a plant selected from a group consisting of Punka granatum, Viburnum plicatum, Camellia sinensis, and Acer spp. The invention extends to uses of such compositions as medicaments, and to methods of treating microbial infections. The invention extends to methods for preventing microbial infections by coating objects and surfaces with the compositions.

Novel hydraulic cements are disclosed that include reactive magnesium oxide prepared by low temperature calcination. The cements can be formulated to suit a large number of applications with various setting times, strength and levels of sustainability either by adding iron salts such as ferrous sulfate or blending with other compatible faster setting hydraulic cements such as Portland cement or by using both methods. The compositions are able to incorporate relatively large amounts of low cost pozzolans such as fly ash to advantage as well as wastes. Many excellent properties are exhibited and in particular good comprehensive strength and resistance to sulfates is able to be achieved.

The invention relates to the technical field of metal nanoparticles, in particular to preparation and an application of greenly synthesized biochar supported metal nanoparticles. The preparation method comprises the following steps: dissolving biochar powder and iron salt (divalent or trivalent) in ethanol water to obtain a biochar and iron ion mixed solution; performing water bath on the biocharand iron ion mixed solution at 30-80 DEG C, adding a green tea extract solution under mechanical stirring, and continuously stirring the mixture for 10-30 min to obtain a greenly synthesized biochar supported zero-valent iron nano-solution; performing separation with a suction filtration method to obtain a precipitate, and drying the precipitate at 40-80 DEG C for 36-72 h to obtain the greenly synthesized biochar supported zero-valent iron nanomaterial. The method has the advantages that the process is simple, the method is green, the cost is low, and the like; the prepared greenly synthesizedbiochar supported zero-valent iron nanomaterial can effectively repair underground water polluted by Cr (VI) ions, cannot cause secondary pollution, is safe to use and has huge application value.

The invention discloses a composite reagent for treating recycled water of printing and dyeing wastewater and an application method of the composite reagent. The composite reagent comprises the following components by weight percent: 20% to 70% of aluminum salt coagulant, 5% to 30% of iron salt coagulant, 5% to 40% of mineral material and 5% to 45% of activated carbon. The method comprises the following steps: preparing the composite reagent for treating the recycled water of the printing and dyeing wastewater into powder or an aqueous liquid in which the content of effective components accounts for 5% to 30%; regulating a pH value of effluent in a printing and dyeing wastewater biochemical system to be within 3 to 9; adding the powder or the aqueous liquid of the composite reagent into the effluent in the printing and dyeing wastewater biochemical system under the condition that the adding quantity of the effective components is between 20mg/L and 1000mg/L after the pH value of the effluent is regulated; and stirring for 0.2 to 2 hours and then standing so as to obtain the recycled water conforming to the water quality standard in textile industry. According to the method, macromolecular colloidal pollutants in the biochemical effluent of the printing and dyeing wastewater, which are difficult to degrade, can be removed by utilizing the coagulation/flocculation performance of aluminum salts and iron salts in the composite reagent; and meanwhile, soluble inert pollutants in the wastewater are removed by utilizing the adsorbability of the activated carbon and the mineral material in the composite reagent.

The invention belongs to the technical field of gas purification, and in particular relates to an iron complex desulfurizer suitable for super-gravity desulfurization. The active ingredients of the iron complex desulfurizer are the following components: a soluble iron salt, an iron salt complexing agent, hydrosulfide absorbants comprising alkaline matters and alcamines, and additives comprising astabilizing agent, a synergist, a sulfur granule settling agent and a corrosion inhibitor. The iron complex desulfurizer has the advantages of large accumulative saturation sulfur capacity (reaching 0.60g/L), high absorption speed, high efficiency, stable solution performance without degradation, easy recovery of sulfur, less side reactions, low running cost and the like; and the accumulative saturation sulfur capacity and the absorption speed are obviously improved, so the iron complex desulfurizer is suitable for the characteristics of small liquid circulating volume and short retention time of the super-gravity desulfurization, fully takes the obvious advantages of the super-gravity technology in the wet desulphurization, and is a high-efficiency, economic, practical and environment-friendly iron complex desulfurizer.

The invention discloses a carbon-based composite material for arsenic and cadmium polluted soil remediation and application of the composite material. The carbon-based composite material disclosed by the invention is prepared by the steps: taking crop straws as raw materials, and charring to prepare charcoal; mixing with an iron salt solution according to a certain solid-liquid ratio, regulating the pH value of the solution in the process so as to realize coprecipitation of the two materials; performing pyrolysis, thereby obtaining the carbon-based composite material. The carbon-based composite material prepared in the invention is applied to arsenic and cadmium compound polluted soil, and methods such as turning over, watering and the like are combined, so that the content of arsenic and cadmium in an effective state can be obviously reduced; therefore, the arsenic and cadmium in the soil can be transferred to a direction with low biotoxicity and migration, the physicochemical properties of the soil can be improved to a certain degree, and the composite material is suitable to be applied to multiple types of soil. The arsenic and cadmium ions in a water body can be effectively removed, the preparation process is simple in operating steps, and the material is wide in source, low in production cost and environment-friendly.

The invention relates to a resource processing method for oily sludge. First, the oily sludge is sent to a closed retorting cracking furnace to be pyrolyzed, and the pyrolyzed period is 1-5 hours under 200-600 DEG C, then the oil, gas, and water are recovered. Second, sulfate or hydrochloride is put into the pyrobitumen of sludge containing inorganic aluminum salt or iron salt flocculant according to the chemical equivalent of the aluminum salt or iron salt 1 to 1-1.5 to do acid-soluble processing. The products after the two processes can be reclaimed and used as the flocculant of the sewage processing system, or reclaimed as the concentrating agent of sludge. The pyrobitumen containing mostly clay mineral can be used as decolorizing and absorbing material of waste water and oil, or used as absorbent for lube-oil complementing and refining process. The method used in oilfield gathering transportation and treatment system can realize zero discharge in course of the gathering transportation and treatment, and can effectively solve the pollution problem of the oily sludge and find the automate answer for the oily sludge. Meanwhile, by adopting the method, the cost for the treatment of sewage flocculation and for adding sludge concentration agent can be reduced and the energy material can be reclaimed from sludge and the wastage of oil can be reduced.

The invention provides a method for preparing lithium iron phosphate/nanometer carbon composite anode material, which is characterized by comprising the steps as follows: 1) a precursor is pretreated, raw materials are weighed according to the components and weight percentage as follows: 0.2%-15% of catalyst, 5%-15% of lithium salt, 40%-60% of iron salt and 25%-45% of phosphate; the catalyst is one or several kinds of metal Fe, Co and Ni; the raw materials are added with dispersant and then are ball-milled in a ball grinder to prepare the precursor; 2) a carbon nano tube or carbon fiber grows; and 3) lithium iron phosphate or adulterant lithium iron phosphate is prepared. The invention solves the problem that the carbon nano tube is difficult to be dispersed in high-viscosity high-solid lithium iron phosphate slurry, and the invention provides the method for growing the carbon nano tube or the carbon fiber synchronously during the process of preparing the lithium iron phosphate and improves the specific capacity and the cycle life of the lithium iron phosphate under the condition of charging and discharging.

A method for preparing magnetic biochar from straw includes the step of selecting of a straw material, wherein wheat straw, corn straw, rice straw or cotton straw is selected as the straw material, the straw material is pretreated by cleaning, then the straw material is dipped with a trivalent iron salt solution, and filtered by vacuum, then a filter cake is dried, and a finished magnetic biochar product can be obtained by carbonization treatment in inert gas conditions. The magnetic biochar can be obtained by dipping the straw material in the trivalent iron salt solution by a pyrolysis process, and a new way for the use of straw is provided.

The invention relates to a process for separating and recovering heavy metallic salt and inorganic acid in pickling waste liquid by a membrane method, which comprises the following concrete steps: filtering and removing solid suspended substances in pickling waste liquid through an inorganic ceramic membrane; separating acid from salt in the ceramic membrane penetrating liquid through diffusion dialysis; and heating the dialysis liquid of a diffusion dialyzer, then introducing the dialysis liquid into a nanofiltration membrane, and cooling and crystallizing the concentrated liquid of a nanofiltration device and then centrifuging the crystal of the concentrated liquid to obtain iron salt, wherein the penetrating liquid of the nanofiltration device passes through a reverse osmosis membrane device, the concentrated liquid of the reverse osmosis device returns to a pickling section, and the water discharged from the reverse osmosis device enters a diffusion dialysis section for recycling. The invention has the characteristics that the pickling waste liquid is completely used as resources, the recovery process is simple, the recovery ratio of metallic salt and acid is high, and water is recycled. The process of the invention can be coupled with various pickling sections to realize continuous and stable automated operation, and the supplemented acid amount can be quantitatively controlled according to the acid amount consumed by the crystallized metallic salt.

The invention relates to a method for preparing poly(3,4-ethylenedioxythiophene)/sulfonated graphene composite hydrogel with a porous structure through supramolecular self-assembly. The method comprises the following steps of: dissolving sodium polystyrene sulfonate and sulfonated graphene in water, stirring, performing ultrasonic dispersion to ensure that the sodium polystyrene sulfonate and thesulfonated graphene are dissolved, adding a 3,4-ethylenedioxythiophene monomer, uniformly stirring, adding polyvalent iron salt, standing at room temperature and reacting to obtain blocky poly(3,4-ethylenedioxythiophene)/sulfonated graphene composite hydrogel. The poly(3,4-ethylenedioxythiophene)/sulfonated graphene composite hydrogel with a controllable and porous structure is prepared by using the interaction and electrostatic action of a hydrogen bond and a pi-pi bond among the sulfonated graphene, the sodium polystyrene sulfonate and 3,4-ethylenedioxythiophene through supramolecular self-assembly. The prepared composite hydrogel has high electrical conductivity and mechanical strength, and high specific capacitance and cycle stability in electroactive electrolyte.

The invention relates to a preparation method of a magnetic-alloy-loaded porous carbon sphere composite wave-absorbing material. The method comprises the following steps: 1) preparing a precursor solution containing two or more magnetic metal ion salts; 2) stirring the porous carbon spheres in the precursor solution for impregnation; 3) filtering out the porous carbon spheres, washing and drying; 4) calcining the dried porous carbon spheres in an inert atmosphere; and 5) cooling to room temperature in an inert atmosphere to obtain the magnetic-alloy-loaded porous carbon sphere composite wave-absorbing material. The iron salt/cobalt salt, iron salt/nickel salt and cobalt salt/nickel salt mixed precursor solution are introduced to the inside of the ducts of the carbon spheres by using the high specific area and strong adsorptivity of the porous carbon spheres through the capillary actions and are combined with the hydrophilic oxygen-containing functional group; and finally, the drying and sintering treatment in the inert atmosphere are performed to obtain the iron-cobalt/iron-nickel/cobalt-nickel-alloy-loaded porous carbon sphere composite material. The whole preparation process is simple in technique and convenient to operate, and has low requirements for the production equipment.

The invention discloses a method for remedying arsenic polluted soil. The method comprises a step of adding iron salt solution into the arsenic polluted soil so that the iron salt solution is reacted with arsenic in the soil to form arsenate FeAsO3 or FeAsO4 of iron. Before the iron salt solution is added, the method also comprises a step of crushing the arsenic polluted soil and steps of adjusting the pH of the arsenic polluted soil and measuring the arsenic content of the arsenic polluted soil. The method can quickly and efficiently treat the arsenic polluted soil, has simple operation and management and is suitable for major unexpected arsenic pollution remediation.