103 results about "Ammonium oxalate" patented technology

The invention relates to a glabridin self-assembly inclusion with an ultra-small particle size as well as a preparation method and application thereof, and belongs to the technical field of cosmetics. The composition disclosed by the invention is prepared from the following components in parts by weight: 0.5 to 5 parts of glabridin, 10 to 30 parts of polyhydric alcohol, 0.4 to 6.5 parts of liquorice root carrier component, 1.5 to 3 parts of nonionic emulsifier A, 0.45 to 1.8 parts of nonionic emulsifier B and 53.7 to 87.15 parts of water, the liquorice carrier component comprises at least one of glycyrrhizic acid, ammonium glycyrrhizinate and glycyrrhetinic acid; the nonionic emulsifier A is a nonionic emulsifier of which the hydrophilic-lipophilic balance value HLB is greater than 9; and the nonionic emulsifier B is a nonionic emulsifier with a hydrophilic-lipophilic balance value HLB of 2-4. The glabridin self-assembly inclusion disclosed by the invention is smaller in particle size, good in wrapping performance and good in targeting property; the stability is good, glabridin wrapping does not separate out, and the transdermal absorption rate is higher.

The invention provides lithium manganese iron phosphate as well as a preparation method and application thereof, and relates to the technical field of lithium ion batteries. Specifically, the method comprises the following steps: preparing a solution containing an iron source, a manganese source and ammonium oxalate, adjusting the pH value to be acidic, and carrying out a water bath reaction on the solution in a sealed state; after the reaction, sequentially carrying out aging, solid-liquid separation and drying to obtain Fe < 1-x > Mn < x > C < 2 > O < 4 >. 2H < 2 > O; preparing a mixed solution containing Fe < 1-x > Mn < x > C < 2 > O < 4 >. 2H < 2 > O, a lithium source, a phosphorus source and a carbon source, and sequentially performing wet ball milling, spray drying and calcination to obtain the lithium manganese iron phosphate. According to the preparation method, the manganese iron oxalate precursor is synthesized in advance, so that uniform mixing of iron and manganese on an atomic level can be realized, and the lithium manganese iron phosphate positive electrode material with high electrochemical performance is prepared; and the preparation method is simple in preparation process and low in cost, and has a good batch production prospect.

The invention relates to the technical field of preparation of new energy battery positive electrode material precursors, in particular to a ferromanganese oxalate precursor, a preparation method and a lithium manganese iron phosphate positive electrode material.The method comprises the steps that a solution A is prepared from water, ferric salt, manganese salt, metal M salt and an antioxidant; then, preparing a solution B from water, ammonium oxalate and an antioxidant; and finally, under the protection of inert gas, dropwise adding the solution B into the solution A to obtain the oxalate ferromanganese precursor. According to the method, the alpha-crystal-form ferromanganese oxalate is successfully synthesized, the yield of the beta-crystal-form ferromanganese oxalate in the synthesis process is greatly reduced, the ferromanganese and the ferromanganese can be mixed at the atomic level, and the dissolution of manganese and the Jahn-Teller effect are inhibited; in-situ metal element doping improves the electronic conductivity of the material; the problems that an existing lithium iron manganese phosphate positive electrode material prepared from ferromanganese oxalate is poor in electronic conductivity and electrochemical performance and cannot meet the use requirement of a lithium ion battery are solved.

The invention relates to the technical field of hard alloy, and particularly discloses a hard alloy material containing graphene oxide and a preparation method thereof.The preparation method comprises the following steps that S1, a graphene suspension aqueous solution, a cobalt chloride aqueous solution and an ammonium oxalate aqueous solution are prepared; s2, mixing the graphene suspension aqueous solution with a cobalt chloride aqueous solution to obtain a GO / CoCl2. 6H2O mixed aqueous solution, adding an ammonium oxalate aqueous solution, uniformly mixing, heating, and carrying out a hydrothermal reaction to obtain a GO / CoC2O4 precursor; s3, placing the GO / CoC2O4 precursor in a reducing atmosphere, and heating and calcining the GO / CoC2O4 precursor to obtain GO / Co composite powder; and S4, the GO / Co composite powder and the tungsten-carbon powder are mixed and sintered, and the hard alloy material is obtained. According to the preparation method, graphene oxide is uniformly dispersed in cobalt powder through a hydrothermal reaction in combination with a high-heat reduction calcination treatment mode, GO / Co composite powder is prepared, then the GO / Co composite powder and hard alloy powder are subjected to compound sintering, and the problems that graphene is not uniformly dispersed in hard alloy and is easy to agglomerate can be effectively solved.

The invention provides a preparation method of micron-sized spherical silver-coated copper powder for the electronic industry, and belongs to the technical field of conductive materials.The preparation method comprises the steps that a copper sulfate solution and ethyl alcohol react to obtain a first solution; adding an ammonium oxalate solution into the first solution to obtain slurry; adding a silver nitrate solution and an ammonium oxalate solution into the slurry, and performing stirring, standing and vacuum drying to obtain an oxalate precursor precipitate; mixing the oxalate precursor precipitate with stearic acid, carrying out first vacuum mixing and kneading, adding fumed silica particles, and carrying out second vacuum mixing and kneading to obtain powder; and heating the powder to 135-145 DEG C in a vacuum state, preserving heat for 1.5-2.5 hours, continuously heating to 270-320 DEG C, preserving heat for 1.5-2.5 hours, cooling to room temperature along with a furnace, and carrying out acid pickling, suction filtration, washing, drying and sieving. The micron-sized spherical silver-coated copper powder is high in oxidation resistance, short in process period and high in yield.

The invention discloses a bacterial strain suitable for large-scale production of high-quality stiff silkworm and application of the bacterial strain. The strain is a beauveria bassiana KW2 strain, and is preserved in Guangdong Microbial Culture Collection Center on November 19, 2024, and the preservation number is GDMCC NO: 65502. When the KW2 strain is used for producing stiff silkworms, the stiff silkworms are pink in color and then gradually fade, so that efficient sorting of the stiff silkworms is facilitated, the quality of the stiff silkworms can be better controlled, the labor cost can be better reduced, and the method is very suitable for large-scale production of the stiff silkworms. Meanwhile, hyphae on the surface of the stiff silkworm are oily and thick, less spore powder is produced, and production environment management and personnel health are facilitated. The KW2 strain has a silkworm death rate of 100%, the bombyx batryticatus is cylindrical and high in quality, and various indexes such as moisture and the like meet standards. Moreover, the content of beauveria bassiana and ammonium oxalate is relatively high, and the medicinal value is high. The KW2 strain has a very good application prospect in improving the large-scale safe production efficiency of high-quality stiff silkworms.

The invention discloses a reactor for treating iron and aluminum metal resources through ammonium oxalate, which is used for extracting iron and aluminum substances after the ammonium oxalate reacts with the iron and aluminum metal resources, and comprises a reaction kettle body, a stirrer, a first pipe orifice for filling high-pressure water vapor, and a second pipe orifice for relieving pressure and filling materials, the third pipe orifice is used for discharging an oxalic acid complex; the fourth pipe orifice is used for discharging ammonia steam; the first pipe orifice, the second pipe orifice and the third pipe orifice are respectively provided with a switch valve; and the fourth pipe orifice is provided with a constant pressure valve. The reaction kettle is used for reacting ammonium oxalate with iron and aluminum metal resources, and device conditions are provided for extracting the iron and aluminum metal resources through ammonium oxalate.

The invention relates to a preparation method of large-granularity cobaltosic oxide for a battery, and belongs to the technical field of battery preparation. The preparation method comprises the following steps: dissolving cobalt salt in deionized water to obtain a high-concentration cobalt ion solution, mixing sodium oxalate and niobium ammonium oxalate for use to form a specific precursor structure, carrying out a co-precipitation reaction on cobalt ions, oxalate and niobium ammonium oxalate in an aqueous solution to generate a cobalt-containing oxalate and niobate compound precipitate, and carrying out solid-liquid separation on the cobalt-containing oxalate and niobate compound precipitate. Then hydrogen peroxide is used for promoting oxidation of cobalt ions, and formation and crystallization of cobalt oxalate precipitates are further promoted; in the preparation process, water is effectively removed through freeze drying, meanwhile, the morphology and structure of precipitates are kept, organic matter and volatile impurities are removed in the roasting and re-roasting process, and formation and stability of a cobaltosic oxide crystal structure are promoted; the stable crystal structure is favorable for prolonging the cycle life and improving the safety of the battery.

The present invention discloses a rapid hydrogen peroxide test kit and a method of using the same, the rapid hydrogen peroxide test kit comprising a sample diluent and a test strip containing a chromogen for detection and a chromogen for quality control in a dry environment. The sample diluent comprises 100-500 mM ammonium oxalate, 0.3-2.0 mM 8-hydroxyquinoline, 50-500 mM sodium chloride, and 10-100 mM of a first pH adjuster for pH 4.5-7.0.

The invention discloses a method for recovering iron resources from jarosite, which comprises the following steps: S1, reacting ammonium oxalate with jarosite to realize jarosite phase dissolution: mixing jarosite with ammonium oxalate, and heating and reacting in a water reaction system to generate ammonia gas to obtain leached residues and leached liquid; s2, the leachate reacts with ammonia to precipitate and separate iron, and ammonium oxalate is recycled: S2.1, the leachate reacts with the ammonia: ammonia gas is introduced into the leachate or ammonia water is added into the leachate for full reaction, and reaction product slurry containing ferric hydroxide precipitate and ammonium oxalate is obtained; and S2.2, separating ferric hydroxide and ammonium oxalate from the reaction product slurry: filtering and separating to obtain a ferric hydroxide precipitate, and cooling to separate out crystals from ammonium oxalate in the filtrate so as to recover ammonium oxalate. According to the method, ammonium oxalate used for replacing iron in the iron vitriol can be recycled, the raw material cost is low, iron element separation and utilization are achieved, solid waste is remarkably reduced, and enrichment of other valuable elements in the iron vitriol is facilitated.

The invention belongs to the technical field of adsorption materials, and particularly relates to a coupling adsorption material containing zeolite and biomass charcoal as well as a preparation method and application of the coupling adsorption material. The coupling adsorption material is composed of modified zeolite, modified coconut shell biomass charcoal and a silane coupling agent interface bonding layer. After the modified zeolite is modified by three steps of hydrochloric acid, ammonium oxalate and sodium chloride, skeleton exchange sites are unified to be Na < + > type, and the NH < 4 + > interception capability is enhanced; after the modified coconut shell biomass charcoal is oxidized by nitric acid and modified by zirconium oxychloride and phosphoric acid, ammonia nitrogen is removed through multi-mechanism synergy; after two-phase coupling, the ammonia nitrogen removal capability is superior to that of a single component. The silane coupling agent interface bonding layer effectively buffers interface thermal stress generated by mismatching of two-phase thermal expansion coefficients in the high-temperature regeneration process, inhibits microcrack initiation and expansion, guarantees the adsorption capacity stability after multiple regeneration cycles, and prolongs the service life of the material.

The present invention relates to a self-assembled inclusion of glabridin with an ultra-small particle size, a preparation method, and an application thereof, and belongs to the field of cosmetic technology. The composition of the present invention comprises the following components in parts by weight: 0.5-5 parts of glabridin, 10-30 parts of polyol, 0.4-6.5 parts of a licorice carrier component, 1.5-3 parts of a nonionic emulsifier A, 0.45-1.8 parts of a nonionic emulsifier B, and 53.7-87.15 parts of water; the licorice carrier component comprises at least one of glycyrrhizic acid, ammonium glycyrrhizate, and glycyrrhetinic acid; the nonionic emulsifier A is a nonionic emulsifier with a hydrophilic-lipophilic balance value (HLB) greater than 9; the nonionic emulsifier B is a nonionic emulsifier with a hydrophilic-lipophilic balance value (HLB) of 2-4. The self-assembled inclusion of glabridin of the present invention has a smaller particle size, good encapsulation performance, and good targeting; it has good stability, the glabridin encapsulation does not precipitate, and the transdermal absorption rate is higher.

The invention discloses a method for extracting aluminum hydroxide from a material containing activated aluminum oxide. The method comprises the following steps: S1, replacing aluminum oxide in the activated aluminum oxide material; S1.1, leaching aluminum in the activated aluminum oxide material by ammonium oxalate: mixing the activated aluminum oxide material with ammonium oxalate, heating and reacting in a water reaction system to generate ammonia gas, leaching aluminum in the activated aluminum oxide material to obtain a reacted material, and filtering the reacted material to obtain leaching residues and a leaching solution containing (NH4) 3Al (C2O4) 3; the activated aluminum oxide material is bauxite, light-burned bauxite, a material containing a metakaolin phase or aluminum ash; s2, ammonia is added into the leachate for a reaction, and reaction product slurry containing aluminum hydroxide solid precipitates is generated; and S3, filtering and separating the reaction product slurry obtained in the step S2 to obtain an aluminum hydroxide solid precipitate and an ammonium oxalate solution.

The invention discloses a method for detecting effective molybdenum in soil through ultrasonic extraction and inductively coupled plasma emission spectrometry. The method comprises a pretreatment step of ultrasonic extraction of a sample and a determination step through the inductively coupled plasma emission spectrometry. The method comprises the following steps: weighing 10.00 g of a soil sample (air dry basis, particle size of 60-100 meshes), putting the soil sample into a polyethylene centrifuge tube, adding 100.00 mL of an oxalic acid-ammonium oxalate extracting agent for dilution, and slightly shaking the polyethylene centrifuge tube to disperse the soil; performing ultrasonic extraction and centrifugation, collecting supernate in a colorimetric tube, sequentially adding nitric acid and perchloric acid into the supernate to decompose organic matters, adding nitric acid to make the solution clear, preparing a to-be-detected solution, and determining the content of effective molybdenum by using inductively coupled plasma emission spectrometry; the method disclosed by the invention is low in operation detection limit, high in precision and accuracy, simple, convenient and feasible, and relatively high in practicability; particularly, the detection cost is low, the economic benefit is fully reflected, and the method becomes a preferable scheme for detecting the content of effective molybdenum in batch soil samples.

This invention provides a method for preparing high-purity ultrafine yttrium oxide, relating to the field of ultrafine oxide powder preparation technology. The method involves removing impurities from a 5N-6N grade yttrium chloride solution to obtain a yttrium chloride solution with low non-rare earth impurities. While emulsifying and shearing an ammonia solution, the low-non-rare earth impurity yttrium chloride solution is introduced into the solution via atomization until the pH of the resulting solution reaches 8-10, yielding a yttrium hydroxide colloidal solution. While emulsifying and shearing the yttrium hydroxide colloidal solution, an oxalic acid solution is introduced into the solution via atomization until the pH of the resulting solution reaches 1.8-2.5. The solution is then filtered to obtain ammonium oxalate yttrium precipitate. Finally, calcination yields high-purity ultrafine yttrium oxide powder. This invention can prepare high-purity ultrafine yttrium oxide with a purity of 99.999-99.9999%, D... 50 The diameter is 0.3–0.5 μm, D 90 With a diameter of less than 1.0 μm, it is suitable for applications such as transparent ceramics and electronic ceramics.

The invention discloses an application of kidney bean seed coat polysaccharide in preparation of a product for improving intestinal flora of old people and / or inhibiting intestinal inflammation, which is characterized in that the kidney bean seed coat polysaccharide is extracted by a citric acid extraction method, a cellulase extraction method and a chelating agent extraction method, and comprises the following steps: soaking and peeling white kidney beans; the method comprises the following steps: drying the seed coats in a hot air oven at 50-80 DEG C for 2-10 hours, grinding the dried seed coats with a high-speed grinder, sieving the ground seed coats to obtain white kidney bean seed coat fine powder, and extracting the kidney bean seed coat polysaccharide from the white kidney bean seed coat fine powder through citric acid, cellulase or ammonium oxalate. Particularly, the invention has potential benefits in the aspects of promoting butyric acid production and improving intestinal health of old people.

The invention provides a copper-based catalyst and a preparation method and application thereof. The preparation method of the copper-based catalyst comprises the following steps: mixing a copper precursor, a zinc precursor, an aluminum precursor and water to prepare a sol solution or suspension; wherein the copper precursor is copper metal salt, the zinc precursor is zinc metal salt, and the aluminum precursor comprises at least one of aluminum metal salt and activated aluminum oxide particles; adding a first reagent into the sol solution or the suspension, and then adding ammonia water to adjust the pH value of the solution to 7 to obtain a neutral solution; wherein the first reagent comprises at least one of citric acid, ammonium citrate, maleic acid, oxalic acid and ammonium oxalate; the ratio of the molar weight of the first reagent to the total molar weight of copper, zinc and aluminum is (1-3): 1; carrying out heating reaction on the neutral solution to obtain wet gel; then drying the wet gel to obtain dry gel; roasting the dry gel to obtain catalyst powder; and carrying out die-casting molding on the catalyst powder, and roasting to obtain the copper-based catalyst.

The present invention provides a method for constructing a fingerprint of a traditional Chinese medicine preparation for treating eczema, comprising the following steps: taking gallic acid, gentiopicroside, geniposide, paeoniflorin, ammonium glycyrrhizate, salvianolic acid B, baicalin, baicalein and wogonin reference substances to prepare a mixed reference substance solution; mixing the traditional Chinese medicine preparation for treating eczema with an organic solvent to prepare a test solution; the organic solvent is selected from one or more of methanol aqueous solution, ethanol aqueous solution and anhydrous ethanol; the mixed reference substance solution and the test solution are respectively subjected to high performance liquid chromatography determination; wherein the conditions adopted by the high performance liquid chromatography include: mobile phase A is selected from one or more of methanol and acetonitrile, and mobile phase B is selected from one or more of phosphoric acid aqueous solution, acetic acid aqueous solution and formic acid aqueous solution; and a gradient elution program is adopted.

The application discloses a method for determining different forms of chromium in soil in a high geological background area and application thereof. The method can sequentially extract the same soil sample and analyze the chromium content in the soil after each step of extraction, so that the distribution of chromium in different forms is obtained, including extracting the adsorbed hexavalent chromium in the soil by using an NH4H2PO4 solution, extracting the iron oxide state chromium therein by using a hot ascorbic acid-ammonium oxalate solution, and extracting the silicate state chromium by using hot concentrated hydrochloric acid, so that the chromium in the chromium iron ore can be fully separated, and accurate results of the chromium form distribution in the high geological background soil are obtained.

The application provides a method for treating acid high-salt tungsten residue wastewater and recycling heavy metals and organic matters, which comprises four steps of precipitation, primary adsorption, secondary adsorption and oxidative deamination. First, ammonium oxalate is added into the tungsten residue wastewater to obtain intermediate effluent I and iron oxalate precipitate; then the intermediate effluent I is passed through a silver-copper exchange resin column to remove silver and copper in the wastewater, and intermediate effluent II is obtained; then the intermediate effluent II is passed through an organic matter exchange resin column to remove organic matters in the wastewater, and intermediate effluent III is obtained; finally, alkali is added into the intermediate effluent III to adjust the pH value to alkaline, an ammonia nitrogen remover is added, and aeration reaction is carried out; after the reaction is completed, PAM coagulant aid is added, and the mixture is statically deposited to obtain sludge and final effluent, and ammonia nitrogen in the wastewater is effectively removed. The method effectively removes heavy metals, ammonia nitrogen, COD and other pollutants in the acid high-salt tungsten residue wastewater, realizes recycling of iron, silver, copper and organic extractant, saves resources and protects the environment.

The invention belongs to the technical field of photoelectric materials, and particularly relates to a multiphase multistage WO3 homojunction photoanode and a preparation method and application thereof. The preparation method of the photo-anode comprises the following steps: preparing a precursor solution by taking sodium tungstate as a raw material, hydrochloric acid as an acid source and ammonium oxalate as a dispersing agent; placing the pretreated conductive glass in a reaction kettle, adding the precursor solution, and carrying out a hydrothermal reaction to obtain conductive glass deposited with yellow tungstic acid; and cleaning, drying and annealing the yellow tungstic acid deposited conductive glass to obtain the yellow tungstic acid deposited conductive glass. The multiphase multistage WO3 homojunction photoanode prepared by the invention can promote the separation of photon-generated carriers, so that the photoelectrocatalysis efficiency is improved.

The invention relates to a method for rapidly determining the content of molybdenum in ferromolybdenum, and belongs to the field of measurement of metal molybdenum. The method comprises the following steps: 1) dissolving a sample: weighing a ferromolybdenum sample in a beaker, adding a dissolving acid, covering a watch glass, and heating to completely dissolve the ferromolybdenum sample; 2) interference ion masking: adding water and a masking agent into the solution; 3) pH adjustment: adjusting the solution to weak acidity, and adding a buffer solution to maintain the pH value of the solution; 4) precipitating and aging: heating the solution to near boiling, adding a precipitating agent to precipitate the molybdenum element, and aging; 5) filtering and firing: after the solution is cooled, filtering the solution with quantitative filter paper, washing the precipitate, adding ammonium oxalate as a stabilizer, carbonizing with a constant-weight platinum crucible, and firing to constant weight; the method is simple in step and convenient to operate, and compared with an existing gravimetric method (the analysis period is shortened by at least 4 hours, the accuracy is higher, and the precision is better.

This invention discloses a method for determining the content of a traditional Chinese medicine compound containing honeysuckle, isatis root, and scutellaria. The method includes the following steps: taking a test solution of the traditional Chinese medicine compound, a first reference solution, and a second reference solution for detection. The chromatographic conditions are as follows: using a chromatographic column packed with octadecyl-bonded silica gel; mobile phase A selected from one or more of acetonitrile, methanol, and tetrahydrofuran; and mobile phase B being an acidic aqueous solution, an alkaline aqueous solution, and / or a buffer salt aqueous solution. The traditional Chinese medicine compound includes honeysuckle, isatis root, scutellaria, indigo leaf, forsythia, platycodon, patchouli, and licorice. The reference standards are baicalin, ammonium glycyrrhizate, honeysuckle saponin B, and dipsacus saponin B. The detection method of this invention is simple, accurate, efficient, stable, precise, reproducible, convenient, and easy to master. It can effectively save energy and reduce analytical costs, while this technology is not disclosed in existing technologies.

This invention discloses a method for preparing and applying a MnO2 / montmorillonite composite material for catalytic formaldehyde degradation, relating to the field of mineral composite catalytic material preparation technology. The method comprises the following steps: blending montmorillonite with a potassium salt to obtain potassium-based montmorillonite; reacting the potassium-based montmorillonite with potassium permanganate and ammonium oxalate to obtain the MnO2 / montmorillonite composite material. The potassium-based montmorillonite prepared in this application acts as a support and provides a solid potassium source for subsequent reactions; potassium permanganate provides a manganese source; and ammonium oxalate controls and reduces manganese defects in the manganese dioxide crystals, resulting in a manganese-defect-rich MnO2 / montmorillonite composite material. The MnO2 / montmorillonite composite material prepared in this application effectively improves the catalytic activity of the catalyst for formaldehyde oxidation at room temperature and reduces the cost of material preparation and application.

The invention discloses a cerium-manganese catalyst for low-temperature propane catalytic combustion as well as a preparation method and application of the cerium-manganese catalyst. According to the method, a continuous method is utilized under stirring, ammonium oxalate is used as a precipitator, manganese sulfate is used as a main catalytic active component, cerium sulfate is used as a trace auxiliary agent, and the invention aims at providing a stable and efficient preparation method of the cerium-manganese catalyst and realizing efficient degradation of propane catalytic combustion under a low-temperature condition. The technical scheme is as follows: (1) preparing a mixed solution A of manganese sulfate and cerous sulfate; (2) preparing an ammonium oxalate aqueous solution B; (3) uniformly stirring the uniform solution at normal temperature for 15 minutes; (4) respectively pumping the solution A and the solution B into a peristaltic pump A and a peristaltic pump B, and mixing and outputting along with a pipeline; (5) centrifuging, washing with deionized water and alcohol, and drying at 60 DEG C to obtain a solid product; and (6) further calcining the solid product in a muffle furnace to obtain a finished product. Relates to the technical fields of petrochemical engineering, thermocatalytic materials and environmental protection.

The invention provides a method for treating acidic high-salt tungsten slag wastewater and recycling heavy metals and organic matters. The method comprises four steps of precipitation, primary adsorption, secondary adsorption and oxidative deamination. The method comprises the following steps: firstly, adding ammonium oxalate into the tungsten slag wastewater to obtain intermediate effluent I and ferric oxalate precipitate; enabling the intermediate effluent I to flow through a silver-copper exchange resin column, and removing silver and copper in the wastewater to obtain intermediate effluent II; then, after the second intermediate effluent flows through an organic matter exchange resin column, organic matters in the wastewater are removed, and third intermediate effluent is obtained; finally, alkali is added into the third intermediate effluent to adjust the pH value to be alkaline, then an ammonia nitrogen remover is added, aeration reaction is carried out, a PAM coagulant aid is added after the reaction is completed, standing and sedimentation are carried out, sludge and final effluent are obtained, and ammonia nitrogen in the wastewater is effectively removed. According to the method, pollutants such as heavy metal, ammonia nitrogen and COD in the acidic high-salt tungsten slag wastewater are effectively removed through a physical method, recycling of iron, silver, copper and the like and the organic extraction agent is achieved, resources are saved, and the environment is protected.

The application discloses a copper strip surface cleaning agent, which is composed of the following components in percentage by mass: 10-20% of citric acid, 5-10% of ammonium oxalate, 5-10% of disodium ethylenediaminetetraacetate, 1-5% of polyhydroxy alcohol, 0.5-2% of persulfate, 0.5-1.5% of surfactant, and the balance of water. Compared with traditional strong acid cleaning, the copper strip surface cleaning agent is safe and environmentally friendly, has no damage to human body and clothes, has no irritating odor, has no pollution to the environment, and has the removal effect of the oxide on the surface of the copper strip reaching the effect of the strong acid cleaning. In the case that degreasing is not complete, the cleaning effect is even better than that of the strong acid cleaning. The copper strip surface is not damaged, the strip surface is not corroded by over pickling, and the copper strip surface has a certain passivation effect.

This invention relates to the field of carbon dioxide fracturing technology, specifically to a special powder for carbon dioxide activators and its large-scale preparation process. The special powder uses potassium perchlorate, salicylic acid, and ammonium oxalate as main raw materials, compounded with trace functional additives. The formula is scientifically controlled, possessing both high exothermic properties and inherent safety. The preparation process includes: pre-treating the raw materials followed by multi-gradient drying, graded ball milling and sieving, pre-mixing, homogenization and mixing, and secondary drying. The special powder prepared by this invention has a component uniformity deviation of ≤1%, a shelf life of up to 24 months at room temperature with sealing, 100% ignition reliability, and is compatible with various carbon dioxide fracturing devices, exhibiting significant safety, environmental, and economic advantages in mining, municipal engineering, and high-gas mines.

The invention discloses a method for recovering lead tetraoxide from waste lead plaster, which comprises the following steps: (1) obtaining a waste lead plaster material, and drying to obtain a lead plaster sample; (2) carrying out acid leaching pretreatment on the waste lead plaster: carrying out acid leaching on the lead plaster sample obtained in the step (1) by using dilute sulphuric acid, wherein the lead plaster sample subjected to acid leaching comprises the main components of PbSO4 and PbO2; (3) desulfurization reaction: leaching the lead plaster sample in the step (2) by using an ammonium oxalate solution to obtain a solid mixture of lead oxalate and lead dioxide; and (4) roasting: roasting the solid mixture in the step (3) to obtain lead tetraoxide. According to the method, the ammonium oxalate solution serves as a desulfurizing agent to directly desulfurize the lead plaster, the obtained solid mixture is directly roasted to obtain a lead tetroxide product, lead dioxide in the waste lead plaster is fully utilized, and the defects that in the process of recovering lead from the waste lead-acid storage battery, the usage amount of chemical reagents is too large, the technological process is long, and secondary pollution is caused are overcome; the method is suitable for industrial production.

The invention belongs to the technical field of resource recovery and reutilization of waste hard alloy materials, and particularly discloses a method for recovering cobalt from waste hard alloy. The cobalt element is efficiently recycled through the steps of pretreatment, acid leaching dissolution, impurity removal and separation, cobalt precipitation, cobalt content measurement and the like. According to the method, the leaching condition is accurately controlled, the impurity removal process is optimized, and the mode of dropwise adding ammonium oxalate in stages is adopted, so that the generated cobalt oxalate precipitate has uniform crystal morphology and particle size distribution. Meanwhile, the method has the advantages of simplicity and convenience in operation, low energy consumption, small pollution and the like. The recovered cobalt element can be used as a lithium battery positive electrode material precursor, a cobalt source of a magnetic alloy and a binding phase of a regenerated hard alloy, has a wide application prospect, and is of great significance in saving cobalt resources and protecting the environment.