73results about How to "Reduce acidity" patented technology

The invention relates to the technical field of comprehensive utilization of solid wastes, and discloses a soil conditioner prepared from coal-based solid wastes and a preparation method thereof, the soil conditioner comprises the following raw materials by weight: 80-100 parts of coal-based solid wastes, 5-15 parts of an inorganic salt material, 100-150 parts of pure water, 1-10 parts of a microbial agent fertilizer and 20-50 parts of crop straw biochar. According to the scheme, the inorganic salt is added, so that multivalent cations such as calcium, iron and aluminum are loaded on the coal-based solid waste and can be replaced with exchangeable sodium ions on soil colloid, and the soil desalting efficiency is improved; the crop straw biochar can increase the content of nutrient elements such as carbon, nitrogen and phosphorus for soil; the porous structure of the modified coal-based solid waste can provide a proper place for growth and reproduction of microorganisms, and the soil microenvironment is improved; the soil conditioner is simple in raw material composition, the coal-based solid waste is used as the main raw material for improving the saline-alkali soil, the source is wide, the production cost is low, pollution to the environment is avoided, and large-area popularization and application in saline-alkali soil areas can be facilitated.

The invention relates to the technical field of grape planting, in particular to a grape nutrition regulation-based early-maturing high-quality light and simplified production method, which comprises the following steps of: regulating nutrition distribution in a germination period, and taking moisture-preserving and rain-sheltering measures on the ground and branches; regulating and controlling nutrient distribution in the flowering period to control branch growth, and ensuring the fruit setting rate based on pinching measures; management is conducted in the fruit expanding period, on the basis of vigorous growth control combined with high photosynthetic management, the photosynthetic efficiency of leaves is ensured, soil and leaf fertilization are adjusted, and it is ensured that nutrient supply meets the fruit expanding requirement; nutrition in the color changing period is regulated and controlled, fruit color changing is promoted based on trunk girdling, specific fertilizer is sprayed to leaf surfaces, and it is ensured that the fruit ripening and color changing process is accelerated; management is conducted in the acid-removing and sugar-increasing period, and the fruit acidity is gradually reduced based on regulation and control of nutrient distribution and fertilization measures. According to the method, the efficiency of early-maturing, high-quality and light-weight production of grapes is improved.

The utility model discloses an alkali wash demulsification system for high carbon number Fischer-Tropsch oil, which comprises an alkali wash demulsification device, a first liquid separation device, a second liquid separation device, a water washing device and a neutralizing device, the alkali wash demulsification device is communicated with the first liquid separation device, the water washing device and the neutralizing device are both communicated with the first liquid separation device, and the neutralizing device is communicated with the second liquid separation device. A liquid inlet of the second liquid separation device is communicated with the washing device, and a liquid outlet of the second liquid separation device is communicated with the neutralizing device. By adopting the alkali washing demulsification system, not only is the yield of oil products effectively improved, but also the acidity of the oil products after water washing is effectively reduced; in addition, the demulsification system is simple in structure, easy to operate and worthy of vigorous popularization and application.

In order to solve the problems of acidity increase and lithium salt consumption in the cycle process of an existing lithium ion battery, the invention provides a non-aqueous electrolyte and a lithium ion battery, the non-aqueous electrolyte comprises a non-aqueous organic solvent, a first lithium salt, a second lithium salt and a first additive, the first lithium salt is lithium hexafluorophosphate, and the second lithium salt is lithium hexafluorophosphate. The second lithium salt comprises at least one of lithium bis (fluorosulfonyl) imide and lithium bis (trifluoromethylsulfonyl) imide, the first additive comprises a compound shown in a structural formula 1: # imgabs0, and the non-aqueous electrolyte meets the following conditions: 45 < = sigma * (b + c) < = 220, 0.01 < = a / c < = 0.8, 0.001 < = a < = 1, 2 < = b < = 19, 1 < = c < = 10, and 6 < = sigma < = 13. The non-aqueous electrolyte provided by the invention can keep a low-acidity state after long-term circulation, and can effectively prolong the cycle life of a lithium ion battery when being applied to the lithium ion battery.

The invention belongs to the technical field of microorganisms, and relates to lactobacillus delbrueckii subsp. Bulgaricus and application thereof. The invention provides a strain of Lactobacillus delbrueckii subsp. Bulgaricus, the strain of Lactobacillus delbrueckii subsp. Bulgaricus is named as Lactobacillus delbrueckii subsp. Bulgaricus, the Lactobacillus delbrueckii subsp. Bulgaricus is preserved in China General Microbiological Culture Collection Center (CGMCC), and the preservation number is CGMCC No.32206. The invention also provides a preparation method of the Lactobacillus delbrueckii subsp. Bulgaricus. The method has the effects of enhancing the texture characteristics of the goat milk, reducing the goaty smell of the goat milk and the like, and has important significance on promoting the development of the goat milk industry.

According to the method for prolonging the fresh-keeping period of the fruits by using the controlled atmosphere fresh-keeping box, the controlled atmosphere fresh-keeping box is prepared by improving the sealing performance of a common fresh-keeping box and covering a certain area of the common fresh-keeping box with a film, and the fruits are put into the box to be stored. When the area of the covering film is 20%, the lotus seeds are stored in a box, and 1-methylcyclopropene can be added; when the area of the covering film is 34.8%, the longan is placed in a box to be stored. Compared with the control, the modified atmosphere preservation box treatment can reduce the weight loss rate and browning degree of the lotus seeds and maintain the contents of Vc, amylose, total phenols and soluble solids; compared with a control group, the modified atmosphere preservation box treatment can inhibit browning of longan peel, delay reduction of soluble solids, acidity and vitamin C, inhibit increase of malondialdehyde content, reduce peroxidase activity and improve catalase activity and glutathione content. According to the technology, the shelf life of the fruits can be effectively prolonged, and the problems that an existing fresh-keeping method is tedious and short in fresh-keeping period are solved.

The invention discloses an ammonia nitrogen adsorption material for soil improvement as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, mixing straw chippings with zeolite powder to obtain a mixed raw material; then putting the mixed raw material into a high-temperature tubular furnace for co-pyrolysis to obtain a composite co-pyrolysis product; and finally, adding the composite co-pyrolysis product into a NaOH solution, uniformly stirring, oscillating and dipping, taking out, repeatedly cleaning with deionized water to be neutral, and drying in a drying oven to prepare an alkali modified product, namely the ammonia nitrogen adsorption material. According to the application, the material adsorbing NH4 < + >-N is added into soil and is used for improving soil performance, so that germination and growth of plants are promoted; the composite material with high NH4 < + >-N adsorption capacity is prepared through co-pyrolysis of the zeolite and the straw, the composite material adsorbing NH4 < + >-N serves as a soil conditioner to be recycled, the adsorption performance of the biochar material to NH4 < + >-N is improved by supplementing the zeolite, and meanwhile the natural loose and porous mineral property of the biochar material also has the feasibility of soil improvement.

The invention provides a preparation method of a hydrogenation catalyst and a method for preparing trimethyl hydroxyethyl propane diamine by using the catalyst. A carrier of the catalyst is a bimetallic oxide carrier, active components of the catalyst are Pd and Ni, and auxiliaries are selected from chromium, manganese, lithium, tin, iron and cerium. The catalyst can be used for preparing trimethyl hydroxyethyl propane diamine by taking N, N-dimethylaminopropionitrile, N-methylethanolamine and hydrogen as raw materials, and is high in activity, high in selectivity, stable in performance and long in service life. In addition, a new reaction route is adopted, ethylene oxide is not used, the risk of the process can be reduced, in addition, raw materials are cheap and easy to obtain, reaction conditions are mild, the product yield is high, the production cost is low, economical efficiency is good, and good industrial application prospects are achieved.

The present invention relates to the field of catalyst technology, and in particular to a method for synthesizing 2,5-dimethyl-2,4-hexadiene from isobutyraldehyde catalyzed by phosphoric acid-modified Zn / HZSM-5, with isobutylene (IB) / isobutyraldehyde (IBA) as reactants, and a Prince condensation reaction is carried out under the conditions of a phosphoric acid-modified Zn-loaded HZSM-5 molecular sieve catalyst to obtain the obtained product. The invention has the advantages that the process is simple, the energy consumption is low, the safety is high, the cost is low, the pollution is small, and large-scale production is possible; the prepared product 2,5-dimethyl-2,4-hexadiene content can reach 60%, which meets the requirements of industrial products; the reaction specificity is strong, there are no other by-products except water, the catalyst is easy to separate, can be reused, and is environmentally friendly and energy-saving.

The invention discloses a fuel ethanol distillation method and device using secondary steam of a superheated steam fluidized bed dryer as a partial heat source, and the device comprises a negative pressure mash tower I, a negative pressure mash tower II, a low-pressure fine tower, a high-pressure fine tower, a molecular sieve adsorber group and a superheated steam fluidized bed dryer. The fermented mature mash enters the degassing section, a part of the fermented mash with gas removed enters the negative pressure mash tower I, and the other part enters the negative pressure mash tower II, and is heated by steam to obtain crude alcohol. The crude alcohol enters the low-pressure fine tower for further distillation after acid removal and dealdehyde removal in the acid removal section, and the light alcohol at the bottom of the tower and the alcohol after distillation enter the middle and lower part and the top of the high-pressure fine tower respectively. After distillation and concentration in the high-pressure fine tower, the light alcohol enters the molecular sieve attachment group together with the concentrated alcohol sent into the low-pressure fine tower for dehydration to obtain fuel ethanol. The negative pressure mash tower II in the device of the invention directly uses the secondary steam of the superheated steam fluidized bed dryer as a heat source, thereby saving steam consumption.

The application discloses a phosphorus-carrying catalyst regeneration waste liquid recycling treatment method and device, and aims to solve the technical problem of how to better control the acidity of the regeneration liquid to maintain the service life of the phosphorus-carrying catalyst, realize the recycling of the regeneration liquid and the concentration reduction of the phosphorus resource, and reduce the treatment difficulty of the regeneration waste liquid. The method comprises the following steps: introducing the phosphorus-carrying catalyst regeneration waste liquid into an adsorption device filled with a regeneration waste liquid phosphorus removal adsorbent, separating the phosphorus component in the phosphorus-carrying catalyst regeneration waste liquid, collecting the effluent as a phosphorus-lean regeneration liquid, recycling the phosphorus-lean regeneration liquid for the regeneration of the phosphorus-carrying catalyst, and mainly using the phosphate as the phosphorus component; when the regeneration waste liquid phosphorus removal adsorbent is saturated, hot water is used as a desorption medium to replace the liquid in the adsorption device, the volume of the desorption medium is controlled to be less than the volume of the phosphorus-carrying catalyst regeneration waste liquid that can be contained in the adsorption device, and the regeneration waste liquid phosphorus removal adsorbent is eluted.

The invention discloses an electrolyte and a lithium ion battery. The electrolyte comprises a lithium salt, an organic solvent and an additive A, in the invention, N atoms, connected with carbonyl, in a pyrimidine ring of the additive A can be combined with H atoms of HF generated by side reaction of lithium salt in the electrolyte to form a complex, so that the effects of reducing the acidity and the gas production rate of the electrolyte are achieved.

The invention belongs to the technical field of detection, and particularly relates to a method for detecting the content of tributyl phosphate. The method for detecting the content of tributyl phosphate comprises the following steps: extracting a liquid to be detected by using water, and layering to obtain an upper oil phase; and mixing the upper oil phase with isooctane, performing gas chromatography detection, and obtaining the content of tributyl phosphate according to the obtained peak area and a preset standard curve. According to the method, water is adopted as an extraction solvent, interfering substances such as phosphoric acid can be removed, TBP can be concentrated, and corrosion to a chromatographic column can be reduced due to acidity reduction. An upper-layer oil phase obtained after water extraction and isooctane are mixed and diluted, so that the viscosity of a sample can be reduced, and the separation effect on a chromatographic column can be improved; meanwhile, the blockage of a chromatographic column can be reduced, and the resolution ratio of a chromatographic peak is improved, so that the content of tributyl phosphate can be more accurately measured.

The invention discloses an organic heat carrier boiling point improver and a preparation method and device thereof, and relates to the technical field of organic heat carriers. The lubricating oil is prepared from alkane base oil, high-flash-point solvent oil, a dispersing agent, a clearing agent, sodium dodecyl naphthalene sulfonate, sodium dodecyl sulfate, 2, 2-methylenebis (4-methyl-6-tert-butylphenol) and p-di-iso-octyldiphenylamine. Materials generated in the deterioration process of the high-temperature heat-conducting oil are often Lewis acids, so that the acidity of the whole heat-conducting oil can be reduced by combining the additive and the deteriorated heat-conducting oil, and macromolecular substances are generated. And the macromolecular substances are decomposed at the wall of the hot furnace tube to become small molecular light components which escape from the system, so that the service life of the heat-conducting oil in the whole system is prolonged. The oxidation resistance of the heat-conducting oil in use is improved, oxidation and boiling point reduction of the heat-conducting oil are delayed or prevented, formed degradation products can be decomposed, an original heat-conducting oil system is cleared to the maximum extent, the heat-conducting effect can be obviously improved, and the energy consumption of the system is obviously reduced.

The application provides an isomerization catalyst and a preparation method and application thereof. The method comprises the following steps: (1) preparing a modified molecular sieve: a solution is prepared by using a rare earth metal salt and deionized water, a hydrogen type molecular sieve is added and ion exchange is carried out at a certain temperature, and the molecular sieve after ion exchange is subjected to acid treatment, then a water solution containing a transition metal is used to impregnate the molecular sieve after acid treatment, and the modified molecular sieve is obtained through drying and calcination; (2) preparing a composite carrier: the modified molecular sieve obtained in step (1) is mixed with a binder, an appropriate amount of acid solution is added, and the mixture is uniformly rolled or kneaded and then is formed into a strip, dried and calcined to obtain the composite carrier; (3) impregnating the composite carrier with a noble metal active component: the composite carrier obtained in step (2) is impregnated with a solution containing a noble metal active component, dried, calcined and reduced to obtain the final isomerization catalyst. The isomerization catalyst prepared by the method has high activity in a normal alkane isomerization reaction, and can significantly improve the selectivity of isomeric alkanes while ensuring a high normal alkane conversion rate.

The invention provides a clear and strong flavor type white spirit and a brewing method thereof. The brewing method of the clear and strong flavor type white spirit comprises the following steps: adding grain flour into long-fermentation-period strong flavor type fermented grains for moistening grains, adding steamed rice husks, and distilling to obtain strong flavor type distillers' grains and strong flavor type raw wine I; distilling the Sichuan fen-flavor fermented grains to obtain fen-flavor distillers' grains and fen-flavor raw wine II; the strong-flavor vinasse is subjected to acid brewing, out-of-steamer, water metering, airing and cooling, and wine brewing koji is added for heap fermentation; cooling the fen-flavor distillers' grains and adding wine brewing yeast; mixing the strong-flavor distillers' grains subjected to stacking fermentation with the fen-flavor distillers' grains added with the wine brewing yeast, and fermenting in a cellar; and distilling the fermented mixed distillers' grains to obtain the wine, thereby obtaining the clear and strong flavor type raw wine III. The Sichuan-style fen-flavor vinasse can partially replace rice husks, the brewing cost is reduced, the alcohol cleanliness of a wine body is increased, the problem that fusel oil is high when the Sichuan-style fen-flavor vinasse is independently produced is solved, and the problem that long-fermentation strong-flavor vinasse is difficult to produce wine is also solved.

The present invention relates to a method for continuously producing 5-hydroxymethylfurfural and 2,5-furandicarboxylic acid. The method of the present invention starts from fructose-based carbohydrates, continuously produces important biomass-based platform compound 5-hydroxymethylfurfural and functional polymer material monomer 2,5-furandicarboxylic acid, and in the process of producing 2,5-furandicarboxylic acid, avoids the separation and purification process of 5-hydroxymethylfurfural, and has the advantages of simple process, low generation and emission of three wastes, environmental friendliness, etc.

The invention belongs to the technical field of Chinese herbal medicine planting, and particularly relates to a method for cultivating black water angelica sinensis in saline-alkali soil. The waterproof cloth with holes, the sand and the straw are laid, so that alkali efflorescence can be blocked, and the air permeability of the soil can be improved; by adding the planting matrix containing organic fertilizer, edible fungus waste fungus bags and original soil, the nutrient content of soil can be increased, the buffering power of the soil can be improved, the air permeability and water permeability of the soil are improved, the root growth of the black water angelica sinensis is stimulated, and the salt resistance of plants is improved; meanwhile, the design of ridges with slopes is combined, so that salt and alkali in the planting land can be washed and dissolved by water, and the survival rate of the black water angelica sinensis is increased. Experiments prove that after the technical scheme provided by the invention is adopted, the utilization rate of northeast saline-alkali soil is improved, the survival rate of the black water angelica sinensis is as high as 90%, and the yield and quality of the black water angelica sinensis are improved.

The invention provides a brewing and deacidification method of aroma-enhanced passion fruit wine, belongs to the technical field of fruit wine, and solves the technical problems of high acidity, poor taste and the like of existing fruit wine. According to the brewing and deacidification method of the aroma-enhanced passion fruit wine, passion fruits harvested in a grading mode are cleaned and then added into a smashing box to be smashed, and fruit pulp is obtained for use; the method comprises the following steps: cleaning glutinous rice, soaking the cleaned glutinous rice in water for 3-5 hours, steaming the cleaned glutinous rice, sprinkling water to cool the steamed glutinous rice, then adding the steamed glutinous rice into an enzymatic hydrolysate, adding a composite yeast agent into the enzymatic hydrolysate, and uniformly stirring to obtain a fermentation substrate; adding the fermentation substrate, distiller's yeast and fruit pulp into a fermentation tank, adding an acid reducing agent, and carrying out sealed fermentation; after the fermentation is completed, precipitating and filtering the passion fruit wine, then feeding the passion fruit wine into a storage tank for storage, sealing the precipitate after precipitation, and then filtering the passion fruit wine. The method has the advantages that the acidity of the passion fruit wine is reduced, the flavor of the passion fruit wine is improved, the filtering pressure is reduced, and the quality is improved.

The invention discloses a conductive material and a preparation method and related application thereof, and relates to the field of materials, raw materials of the conductive material comprise SAMs molecules and EDOT molecules, the high-performance conductive material is obtained after the SAMs molecules and the EDOT molecules are mixed, compared with PSS, the use amount of SAMs in the conductive material is extremely low, acidity can be greatly reduced, and the stability of a device can be improved; and secondly, the energy band structure can be adjusted by adjusting the types and the adding proportion of the SAMs, and proper hole transport layers can be designed for different devices, so that the efficiency of the hole transport material as a carrier transport material is improved, and the application range is expanded. In addition, SAMs serves as a catalyst and a stabilizer in the reaction process, synthesis can be conducted through a one-pot method, the obtained material can be directly used, the complex purification process is avoided, and the method is suitable for large-scale green industrial production and has very high expected industrial value.

The present invention belongs to the field of chemical cleaning technology, and specifically relates to a stainless steel oxide layer cleaning solution and its application. The cleaning solution includes the following components by weight percentage: 10-30% organic acid, 1-3% builder, 0.5-3% dissociation controller, 0.5-4% chelating agent, 0.5-5% inorganic acid, 0.5-3% surfactant, 0.5-3% corrosion inhibitor, and the balance is water. The present invention uses organic acid, builder, dissociation controller, chelating agent, inorganic acid, surfactant, corrosion inhibitor, etc. to degrease, corrode loose, and chelate ablation treatment of the yellow oxide film on the surface of stainless steel. The present invention uses a method of controllable chloride ion hydrolysis to ensure the cleaning efficiency of stainless steel devices and ensure the chloride ion concentration to avoid excessive etching; a stainless steel device with a bright surface is obtained by corroding the yellow oxide coating layer that is difficult to remove on the surface, thereby reducing production costs.

The invention discloses an ultralow-temperature manganese-based SCR (Selective Catalytic Reduction) denitration catalyst and a preparation method thereof. The SCR catalyst comprises manganese oxide, zirconium oxide and tin oxide, in the catalyst finished product, the content of ZrO2 is 26-32 mol%, the content of SnO2 is 13-16 mol%, and the balance is MnO2 in terms of the total content of metal oxides being 100 mol%; by accurately controlling the contents of manganese oxide, zirconium oxide and tin oxide and the addition amount of cetyltrimethylammonium bromide (CTAB), the pore structure of the SCR catalyst is optimized, the activity and selectivity of the catalyst are improved, the performance of the catalyst is improved, and the catalyst can keep higher denitration efficiency under different working conditions; the conversion rate of the ultralow-temperature SCR catalyst to NO reaches 95% or above under the conditions that the reaction space velocity is 100,000 h <-1 > and the temperature is 80 DEG C, and the conversion rate is maintained at a high level for a long time.

The invention relates to the technical field of agricultural cultivation, and discloses an efficient planting mode for grain and oil crops in red soil dry land, which comprises multiple cropping and rotation within a year and multiple cropping and rotation between years. The annual multiple cropping and rotation comprises peanut-rape annual multiple cropping and rotation and sweet potato-rape annual multiple cropping and rotation; the inter-annual multiple cropping and rotation comprises two-year multiple cropping and rotation of sweet potatoes, oilseed rape, spring corn, sesame and green manure and two-year multiple cropping and rotation of sweet potatoes, green manure, peanuts and oilseed rape. According to the efficient mode of the grain and oil crops in the red soil dry land, efficient utilization of land resources is achieved through an intra-year and inter-year multiple cropping and crop rotation mode, land utilization and land cultivation are combined, the problem that continuous cropping obstacles are likely to occur when a single crop is planted on the same land for a long time is solved, and balanced utilization of soil nutrients is facilitated; the soil quality and the annual crop yield and benefit are improved.

The invention discloses a preparation method of juicy peach solid food, and belongs to the field of food. The preparation method of the juicy peach solid food comprises the following steps: S1, mixing 2.2%-2.7% of gelatin powder with water, and heating for dissolving; s2, adjusting the temperature of the feed liquid obtained in the step S1 to 80-85 DEG C, and adding 3.8-6.5% of juicy peach fermentation liquor while stirring; and S3, pasteurizing the product obtained in S2 under the conditions of 88.5 + / -1 DEG C and 8 + / -0.5 min, after pasteurization is completed, spraying and cooling until the center temperature of the cooled content is less than or equal to 35 DEG C, and drying to obtain the juicy peach solid food. According to the preparation method of the juicy peach solid food disclosed by the invention, the types of solid food are expanded, seasonal fruits are effectively utilized, the utilization value and nutritional value of juicy peaches are improved, and the health requirements of modern consumers on solid food are met.

The application discloses a dehydrogenation catalyst and a precursor, a preparation method and application thereof. The dehydrogenation catalyst precursor is obtained through the following steps: mixing an aqueous solution of a precipitant and an aqueous solution of a metal salt to perform a precipitation reaction; and then performing post-treatment. The aqueous solution of the metal salt comprises a copper salt and a carrier alkaline earth metal salt. The temperature of the precipitation reaction is 30-90 DEG C. The end point pH value of the precipitation reaction is 6.0-10.0. The dehydrogenation catalyst precursor comprises an active component precursor and a carrier. The active component precursor is copper oxide. The carrier is one or more of alkaline earth metal oxides. The content of the copper oxide is 10%-75%. The content of the carrier is 5%-51%. The NH3 adsorption amount of the dehydrogenation catalyst precursor is less than 90 umol / g. The dehydrogenation catalyst obtained by reducing the dehydrogenation catalyst precursor is applied to a dehydrogenation reaction for preparing methyl isobutyl ketone. The temperature of the dehydrogenation reaction is 200-300 DEG C. The pressure of the dehydrogenation reaction is 0-0.5 MPa, and the dehydrogenation catalyst has high conversion rate and selectivity.

The invention relates to the technical field of battery thermal management, in particular to a battery cooling liquid, a preparation method thereof and a liquid cooling pipeline with a fire-fighting function. According to the battery cooling liquid, the volume ratio of an aqueous solution of bicarbonate to ethylene glycol is 1: 1, the mass of bicarbonate in every 100g of water is 4-6g, and bicarbonate is selected from at least one of sodium bicarbonate and potassium bicarbonate. The preparation method comprises the following steps: under a closed condition of 10 DEG C, firstly adding bicarbonate into water, fully stirring, filtering a precipitate, mixing with ethylene glycol, fully stirring, filtering the precipitate again, and sealing and storing at 10-30 DEG C. The invention discloses a liquid cooling pipeline with a fire-fighting function. The liquid cooling pipeline comprises a liquid cooling main pipeline, a liquid cooling branch pipeline and cooling liquid, the cooling liquid provided by the invention not only has small corrosion to the liquid cooling pipeline, but also can act together with aluminum sulfate designed on the liquid cooling branch pipeline to play a fire extinguishing function, and a fire extinguishing system does not need to be arranged in the battery pack, so that the cost is low, and the production efficiency is high.

This invention relates to a method for detecting metal elements in electronic-grade boron-aluminum doped source samples. The method includes microwave digestion of the sample and inductively coupled plasma atomic emission spectrometry (ICP-AES) to detect the metal element content. By optimizing sample pretreatment and instrument detection conditions, this invention achieves high-precision determination of multiple metal elements in electronic-grade boron-aluminum doped sources. The accuracy, precision, and sensitivity of the detection results meet the requirements for ultra-trace detection of semiconductor-grade and photovoltaic-grade boron-aluminum doped sources.

The invention provides a lithium extraction method for low-grade lithium ore. The lithium extraction method comprises the following steps: (1) mixing low-grade lithium ore, sulfate and disulfate, and roasting to obtain a raw material; and (2) the raw material is subjected to water leaching, and a lithium-containing leaching solution is obtained. According to the method, the bisulfate and the sulfate are adopted as the lithium extraction auxiliary materials to be roasted together with the low-grade lithium ore, and no acid or water is needed, so that corrosion of acid mist formed in the roasting stage to equipment is avoided, meanwhile, the lithium-containing leachate can have relatively low acidity, and the cost of the subsequent lithium extraction process is reduced.

The invention discloses a method for resource treatment of nitric acid tin stripping waste liquid. The method comprises the following steps: adding sulfuric acid and ferric sulfate to the nitric acid tin stripping waste liquid, then distilling to form a light component nitric acid and a heavy component, performing solid-liquid separation on the heavy component to form a supernatant solution and a precipitate; the supernatant solution is used to recover elemental copper, tin mud and sodium sulfate; the precipitate is used to recover elemental copper, tin mud and ammonium sulfate crystals; in the nitric acid distillation process of the invention, sulfuric acid + ferric sulfate are added to form an iron-ammonium alum-like precipitate, thereby realizing the removal of ammonia nitrogen in the distillation process, thereby realizing the safety and controllability of the nitric acid distillation process.

The present invention relates to the field of catalytic synthesis, and discloses a methylamine synthesis method, which comprises: in the presence of a zeolite catalyst obtained through organic alkali treatment, carrying out a reaction on methanol and ammonia to generate a methylamine-containing material flow, and the acid content of the zeolite catalyst obtained through organic alkali treatment is 200-400 [mu] mol.g <-1 >. According to the methylamine synthesis method provided by the invention, the selectivity of trimethylamine in a reaction product can be reduced, the content of trimethylamine in the product is reduced, and meanwhile, the high methanol conversion rate is ensured.