967 results about "Ferric ion" patented technology

The invention discloses a modulating method of LiFePO4 particle shape, which comprises the following steps: blending one or more composition with lithium ion, ferric ion and phosphate radical ion; adding solvent and certain quantity of crystal growing inhibitor; proceeding solvent heat reaction under certain temperature; washing; filtering; drying; sintering to improve crystallizing property; obtaining the product with regular shape and size.

The invention relates to a preparation method of lithium iron phosphate for the carbon cladding of a lithium ion battery. The prior lithium iron phosphate preparation technical art is complex, and has high cost. The invention has the synthetic process that: ferric oxide, phosphoric acid, simple organics and doped element compound are mixed and dried, the mol ratio of phosphate radical ion, ferric ion and doped element ion is 1:y:z, wherein, y is larger than or equal to 0.95 and smaller than or equal to 1, and y plus z is equal to 1; the mixture is added with lithium source compound, added with water to be mixed and dried, the mol ratio of lithium ion and phosphate radical ion is x:1, and x is larger than or equal to 0.95 and smaller than or equal to 1.05; the mixture which reacts for 2 to 20 hours under 500 to 800 DEG C is cooled in a furnace. The invention finally produces the precursor uniformly mixed with superfine crystal grain, and during the subsequent high temperature solid phase reaction, the end product lithium iron phosphate can be produced through shorter distance diffuseness of atoms. The end product has high purity, the crystallisation is good, the capacity is high, and the cycle stability is good.

A process of electrodepositing high purity copper in a via in a silicon substrate to form a through-silicon-via (TSV), including immersing the silicon substrate into an electrolytic bath in an electrolytic copper plating system in which the electrolytic bath includes an acid, a source of copper ions, a source of ferrous and/or ferric ions, and at least one additive for controlling physical-mechanical properties of deposited copper; and applying an electrical voltage for a time sufficient to electrodeposit high purity copper to form a TSV, in which a Fe⁺²/Fe⁺³ redox system is established in the bath to provide additional copper ions to be electrodeposited by dissolving copper ions from a source of copper metal.

The invention discloses a nonaqueous electrolyte solution for a lithium iron phosphate lithium-ion battery. The nonaqueous electrolyte solution comprises 0.001 to 2mol/L of a lithium salt, 0.01 to 20% by mass of functional additives, a carbonic ester and/or ether organic solvent, and 0 to 0.5mol/L of other additives. Through interaction with iron ions dissolved out, the nonaqueous electrolyte solution reduces reduced iron ions on the surface of a cathode, improves a battery cycle life and a battery service life, improves a battery capacity retention rate and a battery cycle life in a high-temperature environment, and can be used for manufacture of a lithium iron phosphate power battery and an energy-storage battery.

The invention discloses a prussian-blue type sodium ion battery positive electrode material and a preparation method therefor. According to the material, iron ions in iron-nitrogen octahedron in prussian-blue crystal lattices are substituted by transitional metal elements from the interiors to the surfaces of crystal particles based on concentration gradient; the molecular formula of the positive electrode material is Na<x>M<y>Fe<1-y>[Fe(CN)<6>]<z>.nH<2>O, wherein M is a substituting element. The preparation method comprises the following steps of dissolving sodium ferrocyanide, ferrous chloride, and a mixture of substituting element chloride and ferrous chloride into deionized water separately to obtain each precursor solution; then performing a co-precipitation reaction to obtain a prussian-blue turbid liquid, wherein the substituting element is distributed from the interiors to the surfaces of the crystal particles based on concentration gradient; and performing centrifuging, washing and vacuum drying to prepare the positive electrode material. The positive electrode material has the characteristics of high capacity, high cycling stability, simple preparation and the like.

The invention discloses a method for recycling acidic copper-etching waste solution. The method comprises the following steps of: step 1, recovering copper form the acidic copper-etching waste solution, filling the acidic copper-etching waste solution in a reaction kettle, adding reduced iron while stirring so as to replace copper ions in the etching solution and separate out spongy copper, and performing solid-liquid separation treatment so as to obtain a spongy copper product having a water content of 50% and the solution containing lots of ferrous ions after the replacement; and step 2, preparing ferric trichloride from the solution after copper extraction: adjusting the solution according to the ferrous ion content and the pH value of the ferrum-containing solution after the replacement in the step 1, and then charging chlorine and reacting the ferrous ions with the chlorine to generate ferric ions, so as to prepare an effluent treatment agent, namely, ferric trichloride. The method disclosed by the invention is short in production flow, simple in process, low in energy consumption, wide in adaptability, capable of reutilizing all the remainder effective cost of the waste solution after the copper extraction while effectively extracting copper powder in the etching waste solution, and capable of realizing zero-discharge of the acidic etching waste solution of a printer circuit board and effectively protecting environment.

The invention relates to a self-generating foam blocking removal agent for an oil-water well and a blocking removal process. The foam blocking removal agent is composed of an agent formula A and an agent formula B, wherein the agent formula A is composed of inorganic acid, organic acid, quinoline quaternary ammonium salt, alkynol, iodine salt, imidazoline acetate, polyethenoxy ether sulfonic acid, dodecyl trimethyl quaternary ammonium salt and clear water; and the agent formula B is composed of carbonate, peroxide, fluorosurfactant, salt-free imidazoline, ferric ion stabilizer, foam stabilizer and clear water. The blocking removal process comprises the following steps: injecting a certain amount of prepad fluid through a cementing truck; then, injecting the agent A through one cementing truck and the agent B through another cementing truck; after the injection of the agent A and the agent B is finished, injecting displacement fluid; then injecting clear water; and shutting in the well, and then performing flowback or directly transferring into production. According to the invention, based on the synergic effect between the surfactants, the injected blocking removal agent has blocking removal effect and simultaneously has profile control and displacement effect for an injection well; and the injected blocking removal agent has blocking removal effect and simultaneously has foam huff and puff effect on an oil well.

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

The invention publishes a process to increase the bioleaching speed of ores or concentrates of sulfide metal species in heaps, tailing dams, dumps, or other on-site operations. The process is characterized by the continuous inoculation of the ores or concentrates with isolated microorganisms of the Acidithiobacillus thiooxidans type, together with isolated microorganisms of the Acidithiobacillus ferrooxidans type, with or without native microorganisms, in such a way that the total concentration of microorganisms in the continuous inoculation flow is of around 1×10⁷ cells/ml to 5,6×10⁷ cells/ml. In particular, the invention publishes the continuous inoculation of Acidithiobacillus thiooxidans Licanantay DSM 17318 together with Acidithiobacillus ferrooxidans Wenelen DSM 16786 microorganisms, or with other native microorganisms at a concentration higher than 5×10⁷ cells/ml. In addition to the inoculation of isolated bacteria, the invention includes the addition of oxidizing agents such as the ferric ion produced externally, together with nutrients in the shape of salts of ammonium, magnesium, iron, potassium, as well as air enriched continuously with carbon dioxide to promote bacterial action in the bioleaching process of ores or concentrates.

An object of the present invention is to provide a method of efficiently leaching copper from a copper sulfide ore containing chalcopyrite or enargite as a main constituent under versatile conditions for actual operation.

A method of leaching copper from a copper sulfide ore, characterized by comprising using, as a leaching solution, a sulfuric acid solution containing iodide ions and ferric (III) ions in an excessive amount relative to the iodide ions and leaching copper from a copper sulfide ore; or a method of leaching copper from a copper sulfide ore, characterized by comprising leaching copper from a copper sulfide ore with the use of a leaching solution further containing water-soluble ligands such as chloride ions that can stabilize ferric (III) ions in addition to the above components, is provided.

The invention relates to nano-crystalline Fe3O4 particles with high absorption capacity and a preparation method thereof which belong to the field of material science. The microstructure of the particles comprises equiaxed nano-grains, and the particle size of the nano-grains is 5-100nm; the average particle size is 8-25nm, and the saturated magnetization MS is 6.7-7.2 multiplied by 10<minus 3>A/m. The preparation method is as follows: solution containing ferric ions and ferrous ions is prepared, ammonia solution is added under nitrogen atmosphere, ultrasonic waves are transmitted to carry out the ultrasonic dispersion, and heating, stirring and reaction are carried out; solids are washed till neutral by water under the condition of a magnetic field; water is removed by drying after the centrifugal separation. The invention utilizes the simple chemical reaction co-precipitation technology and combines the ultrasonic stirring, the centrifugal separation, the vacuum drying and other technologies to obtain the Fe3O4 powder materials with the average particle size of 8-25nm and the higher saturated magnetization.

The invention discloses coumarin-oxacalix[3]arene fluorescent reagents as well as a preparation method and application thereof, and belongs to the fields of organic synthesis and analytical chemistry. The invention respectively synthesizes two coumarin-oxacalix[3]arene fluorescent reagents: chemical name a: 7,15,23-tertiary butyl-25,26,27-tri{1-[N-(7-coumarin oxyethyl)-1,2,3-triazole]-4-methoxy}-3,11,19-trioxacalix[3]arene; b: 7,15,23-triethoxycarbonyl -25,26,27-tri{1-[N-(7-coumarin oxyethyl)-1,2,3-triazole]-4-methoxy}-3,11,19-trioxacalix[3]arene. Meanwhile, the invention discloses a synthesis method and process conditions. According to the invention, the two coumarin-oxacalix[3]arene fluorescent reagents, in detecting ferric ions, have characteristics of high selectivity and high sensitivity; the fluorescent reagents are applicable to qualitative and quantitative analysis.

The invention belongs to the technical field of material preparation, and particularly relates to a synthesis method for low-temperature manganese-based compound metal oxide denitration catalysts. According to the method, a manganese salt and a salt from a cobalt salt, a ferric salt or a nickel salt are dissolved in ethylene glycol in a mixed manner; a sodium carbonate water solution is dripped at a low temperature, and coprecipitation is carried out; and coprecipitation products are washed by water, are dried, and are calcined in the air, and products can be obtained. The synthesis method provided by the invention adopts a low-temperature artificially induced crystal splitting technology, one kind of ions from cobalt ions, ferric ions and nickel ions are added, and manganese ion precipitate crystals are induced to split in the manganese ion precipitate crystal growth process. The split crystals do not agglomerate during the growing in low-temperature environment. After the crystals after splitting growth are calcined, manganese-based compound metal oxides with high specific surface area can be obtained, and the manganese-based compound metal oxides can show excellent low-temperature catalytic activity when being used for catalyzing a denitration reaction. The synthesis method has the advantages that the operation is simple, the control is easy, and raw materials can be easily obtained, so the synthesis method is suitable for large-scale production, and in addition, the environment pollution is little.

The invention relates to gelled acid used for acid fracturing of a high-temperature fractured-vuggy type carbonate reservoir. The gelled acid comprises components in percentage by weight as follows: 20% of hydrochloric acid (HCl), 3% of a gelling agent (TP-1), 2% of a corrosion inhibitor (MC50), 1.5% of a ferric ion stabilizer (FL4-7), 0.05% of a demulsifying agent (PRJ), 1.5% of a discharge aiding agent (AD12) and the balance of water. The gelled acid can resist a temperature of 130 DEG C, and has an excellent rheological property and shearing resistance, good compatibility and filtration reduction performance and low frictional resistance; compared with common acid (20% of HCl), the acid-rock reaction speed can be reduced by 52%; under the condition of high temperature, the processing depth of the gelled acid to the stratum is enlarged, acidulating efficiency and success rate are increased, and pipe column corrosion and formation damage can be effectively reduced simultaneously, the gelled acid is prone to flowback and has a capacity of carrying solid-phase particles, the acid dissolution time of the gelling agent is short, so that field preparation is facilitated, and the gelled acid is very suitable for acid fracturing improvement of the high-temperature fractured-vuggy type carbonate reservoir.

The invention discloses an air-lift bioreactor, with internal recirculation, for producing sulfide-ore and minerals bioleaching solutions, with a phase-separating and solids-recirculation system without needing to impel the suspension containing the solids to the bioreactor by means of pumps, using diatomaceous earth and/or ferric precipitates as solid support to immobilize iron and sulfur-oxidizing microorganisms. Specifically speaking, the invention describes a bioreactor that continuously produces bioleaching solutions containing microorganisms for inoculation and irrigation of sulfide-ore heaps and dumps processed by bioleaching. The bioreactor is stirred pneumatically, and is generally made up of an air diffuser, a reaction zone, a de-gasification zone, a solids separation zone, a culture media inlet, and a bioleaching solution outlet. Depending on the source of energy supplied for the growth of microorganisms, the bioreactor can produce a solution concentrated in ferric ions, iron-oxidizing bacteria and reduced-sulfur-compound-oxidizing bacteria.

A process for the treatment of a solution containing at least ferric ions, and one or more metal values, said process including the step of maintaining a controlled concentration of ferric ions in solution for a sufficient residence time to control iron hydroxide or oxide crystal growth, and precipitating the iron as a relatively crystalline iron hydroxide or oxide while minimising the loss of the ore or more metal values with the iron hydroxide or oxide.

The invention relates to a preparation method of multi-component organic cross-linked acid liquid, which comprises base liquid and a cross-linking agent, wherein the weight ratio of the base liquid and the cross-linking agent is 100:0.6-0.8; the base liquid comprises the following components in percentage by weight: 3.6-9 percent of formic acid, 4.8-12 percent of acetic acid, 5.5-13.75 percent ofhydrochloric acid, 0.6-0.8 percent of thickening agent, 4.0-5.0 percent of high-temperature corrosion inhibitors, 0.5-1.0 percent of long-term clay stabilizer, 1.0-1.5 percent of ferric ion stabilizers, 0.5-1.0 percent of broken emulsion discharge aiding agent and the balance is water; and the sum of the mass percentages of all the components is 100%. The method has the beneficial effects that the acid liquid system can be cross-linked under the conditions of high temperature and strong acid and is good in temperature resistance and shear resistance, less in filtration and complete in gelout;after the acid liquid is cross-linked, an acid rock is remarkably lower than ordinary gelled acid in reaction speed and is good in speed retarding performance; and the multi-component organic cross-linked acid liquid can be used for realizing the modification of depth acid pressure in a high-temperature deep well of a carbonate rock.

The invention relates to a synthesis method of hercynite and has the technical proposal that aluminium compound and iron compound are mixed according to the mol ratio of Al ion to Fe ion of two to one, added with TiO2 fine powder of 1-20wt percent of the mixture obtained from the mixing of the aluminium compound and the iron compound and 1-6wt percent of binding agent to be mixed for 5 to 180 minutes for formation and then dried for 20 to 30 hours under the temperature of 90 to 120 DEG C and warmed up to 1100 to 1700DEG C with a temperature rising speed of 0.5 to 10 DEG C/min in the atmosphere of nitrogen to be kept warm for 5 to 600 minutes and next naturally cooled so as to obtain the hercynite. The invention is characterized by simple technology, low reaction temperature, low cost of raw materials and no environmental pollution; due to the low oxygen content in the atmosphere of the nitrogen, Fe elements exist in the form of Fe<2+> and all aluminium and iron are transformed to FeAl2O4 under the firing temperature; in addition, as the TiO2 is introduced, Ti<4+> can easily enter into crystal lattice of the FeAl2O4 to produce oxygen-iron vacancy concentration and ferric-ion vacancy concentration so as to promote the sintering with apparent porosity less than or equal to 2 percent after sintering.

The invention provides a preparation method of lithium iron phosphate, which comprises the following steps: 1, dissolving an iron source in water to obtain ferric ion/ferrous ion; adding ascorbic acid, phosphorus source solution and aqueous alkali and adjusting the pH value; and filtering to obtain ferrous phosphate sediment and drying the ferrous phosphate sediment; 2, dispersing the ferrous phosphate into the deionized water, adding phosphoric acid solution, heating and mixing the solution and stirring; and adding a lithium source solution into the mixed solution for reaction to obtain suspension; 3 dissolving a sugar source into the water and adding into the suspension obtained in step 2, stirring and drying to obtain the precursor of lithium iron phosphate; and 4, under the protection of inert gas, increasing, keeping and then reducing the temperature of the lithium iron phosphate obtained in step 3, to obtain lithium iron phosphate; and crushing lithium iron phosphate until the particle size is less than 15 mu m, to obtain the finished product. The lithium iron phosphate product prepared by the method of the invention has perfect electrical conductivity, large specific capacity and uniform particle size.

The invention relates to a method for obtaining high-leaching stability scorodite by precipitating an arsenic-containing solution. The method comprises the following steps: adding a ferrite solution as an arsenic precipitating agent in a continuous feeding mode, and simultaneously adding a neutralizing agent in a certain concentration; continuously introducing oxygen for oxidizing ferrous ions into ferric ions, and then reacting with arsenic in the solution, thus generating the high-leaching stability scorodite. The obtained scorodite can be stably stacked and stored within a pH (Potential of Hydrogen) value range of 2 to 11 and under a strong reducing condition.