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1196 results about "OXALIC ACID DIHYDRATE" patented technology

Oxalic acid is a reducing agent and its conjugate base, known as oxalate (C. 2O2−. 4), is a chelating agent for metal cations. Typically, oxalic acid occurs as the dihydrate with the formula C2H2O4·2H2O.

Production method of environmental-friendly type low-cost middle and high density fiber board

The invention relates to a production method of an environmental-friendly type low-cost middle and high density fiber board. Self-made modified urea-formaldehyde glue, a composite curing agent and a formaldehyde trapping agent are used in a glue blending procedure, wherein the modified urea-formaldehyde glue is prepared by heating formaldehyde, melamine and urea in a reaction kettle through a chemical reaction; the composite curing agent is prepared by mixing ammonium chloride, boric acid, oxalic acid and water; and the formaldehyde trapping agent is prepared from phosphoric acid, urea, a catalyst and water under a certain temperature condition. When the middle and high density fiber is produced, the application amount of the formaldehyde trapping agent is 3 percent or 4 percent of the weight of modified urea-formaldehyde glue solid, the application amount of the modified urea-formaldehyde glue solution is 12.5 percent of the weight of absolute dried fiber, and the application amount of the composite curing agent is 3 percent or 2 percent of the weight of the modified urea-formaldehyde glue solution. The middle and high density fiber board produced using the three ingredients can completely meet Eo level environmental-friendly requirements, has good compatibility and high bonding strength and greatly reduces production cost of the fiber board.
Owner:ZHEJIANG FORESTRY ACAD +1

Method for preparing lithium-enriched lithium manganese oxide solid solution cathode material

ActiveCN102544475AFlexible adjustment ratioHomogeneous coprecipitationCell electrodesOXALIC ACID DIHYDRATENickel salt
The invention relates to a method for preparing a lithium-enriched lithium manganese oxide solid solution cathode material. The method comprises the following steps of: adding a mixed aqueous solution of nickel salt, cobalt salt and manganese salt into an oxalic acid or oxalate aqueous solution by an oxalate coprecipitation high-temperature solid state method, and stirring and reacting to generate nickel, cobalt and manganese oxalate coprecipitation; performing solid and liquid separation, washing and drying to obtain a nickel, cobalt and manganese oxalate precursor; and mixing and grinding the precursor and lithium salt, drying, baking at high temperature in an air atmosphere, and thus obtaining the lithium-enriched lithium manganese oxide solid solution cathode material. During preparation of the precursor, the proportion of the nickel salt, the cobalt salt and the manganese salt is adjusted, so that the constituents of the lithium-enriched lithium manganese oxide solid solution cathode material can be adjusted flexibly. The preparation method is suitable for large-scale, economic, stable and reliable production of the lithium-enriched lithium manganese oxide solid solution cathode material, has obvious advantages, and is high in practical value.
Owner:HUBEI WANRUN NEW ENERGY TECH DEV

Sludge curing treatment agent and method for treating sludge by use of curing treatment agent

The invention provides a novel sludge curing treatment agent. The curing treatment agent comprises a curing agent A and a curing conditioner B, wherein the curing agent A comprises the following components in percentage by weight: 40-60% of MgO, 5-20% of magnesium chloride salt, 10-20% of SiO2, 10-30% of CaO, 0.1-4% of dehydrating agent and 0-20% of fly ash; the curing conditioner B comprises the following components in percentage by weight: 20-40% of H3PO4, 30-50% of NH4H2PO4 and 20-40% of oxalic acid; the curing agent A accounts for 0.5-10% of the total amount of sludge in treatment by mass; and the curing conditioner B accounts for 0-5% of the total amount of sludge in treatment by mass. By adopting the sludge curing treatment agent provided by the invention to treat the sludge with relatively high water content and particularly water content over 80%, the sludge can be cured generally in 1-2 days, the curing time is short, and the water content is reduced to about 30% 7 days later; after the curing, the water content of the sludge is low; and the sludge after the curing treatment can be subjected to landfill on site or applied to roadbed, greening, earthing, ecological restoration and the like, thereby avoiding secondary pollution to environment.
Owner:SHENZHEN OCEAN POWER INDUSTRIAL CO LTD +3

Silver nanometer column array erected on orifice of porous alumina template and preparation method and application thereof

The invention discloses a silver nanometer column array erected on the orifice of a porous alumina template and a preparation method and application thereof. The silver nanometer column array is characterized in that silver nanometer columns with the heights of 30-200 nanometers and the diameters of 30-60 nanometers are sequentially hexagonally arrayed on the periphery of the orifice of the porous anodic alumina template with taper holes; and silver nanometer particles with the particle size of 5-40 nanometers are attached to the walls of the taper holes. The preparation method comprises the following steps of: firstly placing an aluminum sheet into an oxalic acid solution, and carrying out anodization at direct-current voltage for at least 2 hours; then placing into a phosphorus-chromium acid mixed solution, and soaking for at least 3 hours to obtain an intermediate product; then firstly placing the intermediate product into the oxalic acid solution, carrying out the anodization at the direct-current voltage for at least 20 seconds, then placing the intermediate product into a phosphorus acid solution, and soaking for at least 1 minute; repeating the process for at least 10 times to obtain the alumina template with the holes in the shape of the taper holes; and then placing the alumina template into an ion sputter for silver sputtering so as to prepare a target product. The silver nanometer column array disclosed by the invention can be used as an active base of surface-enhanced Raman scattering; and the content of rhodamine or tetrachlorobiphenyl which is attached to the silver nanometer column array is measured by using a laser Raman spectrometer.
Owner:HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI

Preformed soldering terminal with halogen-free soldering fluxes coated on surfaces

The invention provides a preformed soldering terminal with halogen-free soldering fluxes coated on the surfaces, and the performed soldering terminal is good in soldering performance, and the quantity of the soldering fluxes can be controlled easily. A soldering flux coating is formed by the method that the preformed soldering terminal is wetted by halogen-free liquid soldering fluxes and then dried, the halogen-free liquid soldering fluxes are composed of the following components by weight: 35-42% of carrier, 1.0-1.4% of surface wetting agent, 0.5-1.2% of leveling agent, 0.3-0.5% of active agent, 0.1-1.0% of resin film-forming agent, 0.15-1.2% of thickening agent, and the balance is organic solvents. The carrier is rosin, the surface wetting agent is T-80, TX-100 and Span60, the leveling agent is OP-10, the active agent is oxalic acid, salicylic acid and malic acid, the resin film-forming agent is polybutadiene and polyurethane, the thickening agent is hydrogenated castor oil, and the organic solvent is alcohol or ketone which is lower than 110 DEG C in boiling point. The weight of the preformed soldering terminal with the halogen-free soldering fluxes coated on the surfaces is regarded as a standard, the content of the soldering flux coating is 0.2-5.0%, and the preformed soldering terminal with the halogen-free soldering fluxes coated on the surfaces is suitable for soldering of packaging of electronic components.
Owner:ZHEJIANG ASIA GENERAL SOLDERING & BRAZING MATERIAL

Method for recovering lithium from waste ternary lithium batteries

The invention discloses a method for recovering lithium from waste ternary lithium batteries, and relates to the technical field of lithium ion battery recovery. The method comprises the steps of placing a lithium battery into saturated brine for complete discharge, and then physically disassembling and separating to obtain a current collector coated with a positive electrode material; carrying out ultrasonic oscillation separation to obtain the positive electrode material containing the lithium, carrying out oxidation roasting to remove impurities such as carbon, then dissolving to separate the lithium in the positive electrode material by using oxalic acid under the heating and stirring through microwave radiation, converting the lithium in the positive electrode material into water-soluble lithium oxalate, and using carbonate to precipitate the lithium to obtain pure lithium salt due to the fact that other impurities such as nickel, cobalt, manganese and other compounds are difficult to dissolve in water; and after nickel, cobalt, manganese and lithium salts in a formula ratio are added into a filter cake for dissolving out the lithium, carrying out ball milling and roasting onthe filter cake to prepare the active ternary positive electrode material. The recovery and purification method has the advantages of being simple in process, short in reaction time, environment-friendly, low in cost and high in recovery rate.
Owner:ZHEJIANG METALLURGICAL RES INST

Method for cleaning immersed ultrafiltration membrane in wastewater reuse

ActiveCN103949163AGood water flowGood operating differential pressureSemi-permeable membranesOXALIC ACID DIHYDRATEUltrafiltration
The invention discloses a method for cleaning an immersed ultrafiltration membrane in wastewater reuse. The method comprises the following step of chemical cleaning. The method is characterized in that the step of chemical cleaning comprises the following substeps of alkali cleaning, acid cleaning or combined alkali cleaning and acid cleaning, wherein each of the alkali cleaning method and the acid cleaning method is of a method combining the circulatory cleaning with the immersed cleaning, and an alkali cleaning agent comprises sodium hypochlorite, sodium dodecyl benzene sulfonate and sodium tripolyphosphate; an acid cleaning agent comprises citric acid, hydrochloric acid and oxalic acid. The method has the advantages that sodium dodecyl benzene sulfonate and sodium tripolyphosphate are added in the process of alkali cleaning by sodium hypochlorite, so that the cleaning effect of the method on ultrafiltration organic matters and oil pollutants is obviously better than that of a normal alkali cleaning method, the polluting and plugging degree of the cleaned ultrafiltration membrane can be reduced, and stability in operation can be realized; the acid cleaning is adopted as required after alkali cleaning, and the oxalic acid agent is added in the process of acid cleaning, so that the ultrafiltration membrane can be thoroughly cleaned, and the produced water flow and the running differential pressure of the ultrafiltration membrane can be recovered to be the optimal effect.
Owner:SHANXI TAIGANG STAINLESS STEEL CO LTD

Method for separating and utilizing neodymium iron boron waste materials

ActiveCN103773966AReliable separation and recoveryReduce the cost of separation and recoveryIron compoundsProcess efficiency improvementOXALIC ACID DIHYDRATEPhosphate
The invention provides a method for separating and utilizing neodymium iron boron waste materials. The method comprises the following sequential steps of dissolution with hydrochloric acid, primary solid-liquid separation, precipitation with oxalic acid, secondary solid-liquid separation, hydrolysis process, third solid-liquid separation, acidic oxidation process, precipitation of ferric phosphate, fourth solid-liquid separation, evaporation and concentration, and fifth solid-liquid separation. Iron oxide red and praseodymium oxide are obtained through the steps of dissolution with hydrochloric acid, primary solid-liquid separation, precipitation with oxalic acid and secondary solid-liquid separation; iron oxide red and ferric phosphate precipitate are obtained through the steps of dissolution with hydrochloric acid, primary solid-liquid separation, precipitation with oxalic acid, secondary solid-liquid separation, hydrolysis process, third solid-liquid separation, acidic oxidation process, precipitation of ferric phosphate and fourth solid-liquid separation; ammonium chloride is obtained through the steps of dissolution with hydrochloric acid, primary solid-liquid separation, precipitation with oxalic acid, secondary solid-liquid separation, hydrolysis process, third solid-liquid separation, acidic oxidation process, precipitation of ferric phosphate, fourth solid-liquid separation, the evaporation and concentration and fifth solid-liquid separation. The method is high in recovery rate and purity, environment-friendly and pollution-free, low in recovery cost and the like.
Owner:绵竹三人禾科技发展有限责任公司

High-efficiency super-smooth chemical mechanical polishing method for lithium niobate crystal

The invention discloses a high-efficiency super-smooth chemical mechanical polishing method for a lithium niobate crystal and belongs to the technical field of ultraprecision machining of nonlinear optical crystals. The high-efficiency super-smooth chemical mechanical polishing method is characterized in that a sample is a lithium niobate crystal; the lithium niobate crystal is processed by adopting a method of combining grinding of bonded abrasives, polishing of a retaining ring hard polishing pad and chemical mechanical polishing of a retaining ring soft polishing pad, wherein the hard polishing pad is a synthetic leather or polyurethane polishing pad; the soft polishing pad is non-woven fabric or fuzzy polishing pad; a pH value of a chemical mechanical polishing solution is 10.2-10.6; the chemical mechanical polishing solution contains four kinds of cerium oxide, silicon oxide, potassium hydroxide, sodium hydroxide, barium hydroxide, potassium permanganate, hydrogen peroxide, citric acid, acetic acid and oxalic acid; the grinding time of the bonded abrasives is 15-25 minutes; the polishing time of the hard polishing pad is 50-70 minutes; the chemical mechanical polishing time is 3-6 minutes; the removal rate of materials for chemical mechanical polishing is 420-460nm/min; the planeness of the polished lithium niobate is 3.8-5.5[mu]m; the surface roughness Ra of the polished lithium niobate is 0.35-0.5nm and the PV value of the polished lithium niobate is 3.8-6nm. The high-efficiency super-smooth chemical mechanical polishing method disclosed by the invention has the beneficial effect that a high-efficiency super-smooth polishing method of a nonlinear optical crystal is realized.
Owner:DALIAN UNIV OF TECH

Oxalate coprecipitation preparation method for high-capacity lithium-rich cathode material

The invention relates to an oxalate coprecipitation preparation method for a high-capacity lithium-rich cathode material. The preparation method is characterized by comprising the following concrete steps: dissolving soluble Ni salt, or Co salt and Mn salt, or Ni salt, Co salt and Mn salt in a proper amount of deionized water according to a stoichiometric ratio to prepare a metal salt solution with certain concentration, dissolving oxalate or oxalic acid in deionized water to prepare an oxalate solution with certain concentration, mixing the metal salt solution with an oxalate or oxalic acid solution in a way of straight adding, reverse adding or combined adding, adjusting the pH value of a mixed solution to be in a range of from 6.5 to 8.5, allowing a coprecipitation solution to be formed, and carrying out filtration with filter paper, rinsing with deionized water and drying on the coprecipitation solution so as to obtain precipitation precursor; and subjecting excess Li salt and the precipitation precursor in a certain stoichiometric ratio to ball milling and mixing and carrying out high temperature sintering so as to obtain an xLi2MnO3.(1 - x)LiMO2 (wherein M is Co, Ni1/2Mn1/2 or Ni1/3Co1/3Mn1/3) material at last. The method costs little and does not need a high temperature in preparation of a lithium-rich material and allows the shape and the size of the prepared material to be easily controllable.
Owner:CHINA FIRST AUTOMOBILE
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