48 results about "Calcium oxalate" patented technology

The invention provides a method for extracting lithium, rubidium and cesium through strengthened roasting of lepidolite and preparing lithium, rubidium and cesium salt, and belongs to the technical field of lithium, rubidium and cesium extraction.The method comprises the steps that lepidolite, a carbon / sulfur additive and chlorine salt are subjected to ball milling, roasting and grinding, and roasted sand is obtained; through thermodynamic analysis on the lepidolite, after the carbon / sulfur additive is introduced, the Gibbs free energy of the reaction of the lepidolite and the additive is reduced, the reaction trend is improved, and in the roasting process, ions such as sodium, potassium and calcium in chlorine salt and the carbon / sulfur additive are replaced in a similar isomorphic manner, so that lithium, rubidium and cesium are leached more easily; in the process of intensifying roasting by introducing the carbon / sulfur additive, the use amount of the chlorine salt additive is reduced by 10-25%, potassium-sodium mixed salt and calcium oxalate are recycled, the recycling rate is greater than 50%, and the leaching residue amount is reduced by 30-40%; and the carbon / sulfur additive can directionally promote the reaction of the calcium salt additive and the lepidolite and convert the calcium salt additive into dicalcium silicate, so that the leaching residues obtained in the subsequent leaching process are easier to recycle.

The application provides a high-value recycling method of rare earth oxalate precipitation wastewater, and the method comprises the following steps: (1) under the condition of field strengthening, mixing the rare earth oxalate precipitation wastewater and an alkaline calcium salt, and obtaining a calcium oxalate precipitation and a calcium salt solution after neutralization reaction; (2) under the condition of field strengthening, mixing the rare earth chloride and the calcium oxalate precipitation, and obtaining a rare earth oxalate precipitation and a calcium chloride solution after displacement reaction; (3) mixing the rare earth sulfate, the calcium salt solution and the calcium chloride solution, and obtaining a calcium sulfate precipitation and a rare earth chloride solution after precipitation reaction. The method provided by the application not only realizes harmless treatment of the rare earth oxalate precipitation wastewater, but also realizes high-value recycling of the oxalic acid resources in the wastewater, and high-value building material calcium sulfate is prepared, waste is turned into treasure, cost is reduced and benefit is increased, and no salt-containing wastewater is discharged, so that the method is a new green and low-cost rare earth oxalate precipitation wastewater resource recycling technology, and promotes green and sustainable development of the rare earth industry.

The invention discloses a green, environment-friendly and efficient vanadium extraction method, and relates to a roasting additive and a roasting process thereof, and the method is realized by the following steps: mixing vanadium slag and a calcium oxalate additive, roasting, and treating the roasted clinker with acid to obtain a vanadium ion-containing solution and low-solubility residues; and treating the vanadium-containing ion solution to obtain a vanadium product with high vanadium content. According to the method, vanadium in the vanadium slag can be efficiently and rapidly separated and purified, an existing vanadium extraction process is simplified, the yield of vanadium is increased, the temperature and time needed by roasting the vanadium slag through a traditional calcium method are reduced, the risk of percolation of vanadium extraction tailings through a traditional sodium method is reduced, and the problems that in the traditional vanadium slag vanadium extraction process, the vanadium extraction rate is low, energy consumption is high, and the process is complex are solved; no harmful waste is discharged in the whole process, and no hexavalent chromium leakage risk exists in the leached tailings. The method is simple in process, energy-saving, environment-friendly, high in operability and wide in application prospect.

The invention discloses an ICAM-1 targeting engineered exosome-metal phenol nano-drug as well as a preparation method and application thereof. The nano-drug is composed of an engineered exosome and metal phenol nano-particles, wherein ICAM-1 targeting VHH antibodies are displayed on the surface of the engineered exosome, and the metal phenol nano-particles are encapsulated in the engineered exosome and formed by self-assembly of iron ions and resveratrol. The MPNs are efficiently loaded into the exosome through an electroporation method, and a composite nano delivery system (ICAM (at) Exo (at) MPNs) is constructed. The system has multiple advantages of active targeting of kidney inflammation parts, active oxygen responsive drug release, simulation of antioxidant enzyme activity, regulation and control of macrophage functions and the like. The ICAM (at) Exo (at) MPNs can remarkably relieve kidney crystal deposition, oxidative stress and inflammatory response induced by calcium oxalate, and the protective effect of the ICAM (at) Exo (at) MPNs is related to regulation and control of an SLC1A7 / MerTK signal channel. The invention provides an efficient and safe new strategy for preventing and treating the calcium oxalate kidney injury.

To develop a cultivation technique that enables provision of mulberry leaves sufficiently reducing the content of calcium oxalate monohydrate crystals which are associated with food poisoning concerns, from the perspective of provision of safe and reliable food; and to enable complete yellowing of mulberry leaves and enhance the content of a flavonoid pigment.SOLUTION: Since mulberry is a C3 plant and its photosynthetic activity is particularly susceptible to photoinhibition, light receiving posture, such as a leaf angle, has a significant impact on the photosynthetic capacity of the plant community. Therefore, establishment of a cultivation environment (e.g., pruning, planting density) that account for leaf blade inclination angle, regulation of a photosynthetic amount through appropriate shading control, and use reduction of lime to an upper limit for soil management, are actively examined.SELECTED DRAWING: Figure 1, Figure 6

The application belongs to the technical field of solid waste utilization, and discloses a high-activity conductive steel slag composite activator, a preparation method and application, which comprises the following components in parts by mass: polyol amine 0.6-1 part, polyol 2-4 parts, sodium citrate 0.8-1.2 parts, calcium oxalate 1-1.5 parts, silica ash 0.2-0.6 parts, and carbon nanotube array 0.05-0.1 part; the polyol amine comprises glycerol, triethanolamine, diisopropyl alcohol amine and triisopropyl alcohol amine; and the polyol is ethylene glycol. The polyol amine, the polyol, the sodium citrate, the calcium oxalate, the silica ash and the carbon nanotube array are mixed in parts by mass; and the mixture is subjected to magnetic stirring for 10 hours. The application has obvious improvement effect on the conductivity of steel slag cement, and the carbon nanotube array reduces the resistivity, which is beneficial to the health monitoring of soil and the active alarm of concrete diseases. The application has lower cost, rationally utilizes waste resources, and is beneficial to the ecological environment.

The invention discloses a method for preparing high-purity lithium oxalate from a disassembled product of a lithium ion battery. Relates to the technical field of lithium ion battery recovery. The method for preparing lithium oxalate comprises the following steps: S1, mixing waste lithium battery black powder and calcium salt in an organic solvent, and grinding and filtering to obtain first slag; s2, the first slag is dried at the temperature of 400 DEG C or below, and second slag is obtained; s3, mixing the second slag with carbonate, and performing vacuum roasting to obtain third slag; s4, mixing the third slag, oxalic acid and water, heating for reaction, and filtering to obtain a crude lithium oxalate solution; s5, heating the crude lithium oxalate solution, adding oxalic acid, calcium salt and an alkaline reagent, and filtering to obtain a refined lithium oxalate solution after the reaction is completed; and S6, enabling the refined lithium oxalate solution to pass through an adsorption material, and filtering to obtain the lithium oxalate. The method is short in production flow, simple in equipment and easy in process control, high-purity lithium oxalate can be prepared, and the lithium yield is greater than or equal to 92%.

Systems and methods for use in wastewater treatment plants that use aerobic digestion are provided. The systems and methods precipitate phosphates from the supernatant of an aerobic digest to produce a brushite-containing sludge, at least a portion of which is recirculated back into the aerobic digest. The methods reduce phosphate in the reject water produced by dewatering an aerobic digestate, while maintaining the pH of the aerobically digested sludge in a suitable range for polymer flocculants commonly used in sludge dewatering.

The invention relates to a geopolymer material for well cementation and modified calcium hydroxide, and belongs to the field of geopolymers. The geopolymer material for well cementation comprises the following components: a gel material, sodium carbonate, modified calcium hydroxide and a retarder, the modified calcium hydroxide is calcium hydroxide of which the surface is coated with calcium oxalate. According to the invention, modified calcium hydroxide and sodium carbonate are used as activators, and the modified calcium hydroxide is calcium hydroxide coated with calcium oxalate on the surface, so that the problem of high dissolution rate of calcium hydroxide is improved, and the reaction rate of calcium hydroxide and sodium carbonate, namely the thickening time, can be conveniently adjusted by the retarder, so that the dosage of the retarder is reduced. Furthermore, the strength of the geopolymer can be damaged due to excessive addition of the retarder, and the strength of the geopolymer is improved due to reduction of the dosage of the retarder.

This invention provides an ion-doped calcium oxalate thermochemical heat storage material and its preparation method, the chemical formula of which is Ca. 1‑ x M x C2O4·H2O, where M is a dopant ion and x is the mole fraction of the dopant ion; M includes Mg 2+ Co 2+ Zn 2+ 、Sr 2+ One or more of the following. This invention regulates the lattice parameters, local coordination environment, defect state, and microstructure of calcium oxalate by doping with ions. While maintaining the original reversibility and cycle stability of the calcium oxalate system, it further optimizes its dehydration thermal storage temperature range, thermal response boundary, structural evolution behavior, and application compatibility materials, thereby improving the thermochemical thermal storage performance of calcium oxalate from the internal structural level.

The invention discloses a preparation method and device of instant polygonatum sibiricum. The preparation method comprises the following steps: step 1, determination of a preparation method: preparing the instant polygonatum sibiricum by adopting a catalyst and a collected solution, and confirming raw materials of the catalyst; step 2, product putting: putting the product into a preparation device; according to the method, soybean and purple sweet potato powder are combined in any proportion to serve as a catalyst, meanwhile, collected liquid is poured on a cooking layer, the method has the advantages that the technological process is simple and convenient, equipment investment is small, operation is stable and easy to control, and the prepared instant rhizoma polygonati product is high in polysaccharide content and stable in quality; soybean, purple sweet potato powder and the like are used as auxiliary materials, rhizoma polygonati is catalyzed in the steaming process, removal of calcium oxalate needle crystals with the tongue numbness feeling in rhizoma polygonati mucus cells is accelerated, irritation is eliminated, throat irritation is avoided, and compared with a traditional mode, the finally prepared product has the advantages of saving time and energy consumption.

The invention discloses a leaching method of dolomite type surrounding rock. The method comprises the following steps: mixing dolomite type surrounding rock powder with the particle size of less than or equal to 150 meshes with a formic acid solution with the concentration of 1.5-4.5 mol / L to obtain dolomite type surrounding rock powder slurry; the dolomite type surrounding rock powder slurry is leached for 2-12 h under the condition that the temperature ranges from 60 DEG C to 100 DEG C, and a leached product is obtained; carrying out solid-liquid separation on the leaching product to obtain a leaching solution and leaching residues; wherein the liquid-solid ratio of the formic acid solution to the dolomite type surrounding rock powder is (5-9) mL: 1g; reacting the leachate with oxalic acid to obtain a reaction product; and carrying out solid-liquid separation on the reaction product to obtain a mixture of calcium oxalate and magnesium oxalate and a liquid product. According to the leaching method, selective leaching of calcium and magnesium in the dolomite type surrounding rock is achieved, rare earth and niobium elements are enriched, and follow-up recycling of rare earth and niobium resources in the dolomite type surrounding rock is facilitated; in addition, the recycling of formic acid in the production process is realized by recycling calcium and magnesium in the leachate.

This invention discloses a highly antibacterial oral sealant for treating dentin hypersensitivity, its preparation method, and its application. The sealant's raw materials include calcium oxalate, diammonium hydrogen phosphate, tetraethyl orthosilicate, and cerium nitrate hexahydrate. It is a bioactive material that can generate hydroxyapatite in a short time and exhibits good biocompatibility. This sealant regulates and stabilizes Ce... 3+ Ce 4+ The ratio of these components results in high antibacterial properties, making it suitable for use as an oral sealant. It primarily works by sealing the gaps between the pits and fissures of teeth to block bacterial invasion, thereby improving the acid resistance of tooth enamel and preventing cavities. At the same time, this material has good bactericidal properties, allowing for deeper bacterial removal and ensuring a clean oral environment.

The invention discloses a lycium barbarum defoliating agent and a preparation method thereof, and relates to the field of lycium barbarum defoliating agents, and the lycium barbarum defoliating agent is prepared from the following components by mass: 20-60 parts of potassium carbonate; 30 to 50 parts of sodium oxalate; 5 to 10 parts of ethephon; 10 to 20 parts of abscisic acid; the preparation method comprises the following steps: mixing and uniformly stirring the abscisic acid and the sodium oxalate to obtain a mixed solution A, dissolving the potassium carbonate powder with the purified water to obtain a potassium carbonate mother solution, fully mixing the mixed solution A with the potassium carbonate mother solution, adding the ethephon, and uniformly stirring to obtain the Chinese wolfberry defoliating agent. Potassium carbonate and calcium oxalate act on plant leaves at the same time, the leaves can be dewaxed and dewaxed rapidly, the content of calcium ions in petioles is reduced, abscisic acid and ethephon are blended, synthesis increase of protein is promoted, re-synthesis of cellulase in a separation layer is promoted, formation of the separation layer is accelerated, organs fall off, and the leaves fall off. Therefore, the purpose of defoliating is achieved.

The invention relates to a method for jointly determining 241Am and 244Cm in aerosol by taking 243Am as a yield tracer, which comprises the following steps: step 1, sample pretreatment: cutting an aerosol sample into pieces, adding 243Am as an isotopic tracer, ashing, and leaching by adopting a nitric acid solution A; 2, valence state adjustment, wherein a ferrous sulfamate solution is sequentially added into the leaching solution for reduction treatment, and a sodium nitrite solution is added for oxidation treatment; step 3, precipitating calcium oxalate: sequentially adding oxalic acid and calcium chloride into the sample solution, adjusting the pH value to 2.0, collecting the precipitate, and firing; step 4, separation and purification: dissolving the sample with a nitric acid solution B, and then separating and purifying with a DGA resin column; and step 5, carrying out electro-deposition on the eluent in an ammonium sulfate system to prepare a source, and carrying out measurement of 241Am and 244Cm by adopting a low background alpha spectrometer. According to the method, interference of fission elements such as plutonium isotope is low, and the recovery rate of curium-244 is high.

This patent document discloses novel oxamaies that can act as potent inhibitors of calcium oxalate (CaOx) crystallization and new macrocyclic prodrugs that will offer improved lipophilicity, small size, lower polar surface area, and greatly reduced solvent accessible surface area, all properties known to impart better oral bioavailability. Also disclosed herein are methods of treating diseases associated with abnormal levels of calcium oxalate and its crystallization.

The invention provides a poultry manure resource utilization method based on multi-stage treatment and a fertilizer preparation method thereof, a liquid fertilizer and a soil conditioner. The resource utilization method comprises the following steps: S1, crushing and screening poultry manure into powdery manure; s2, after the inorganic acid solution and the excrement are mixed and react, solid-liquid separation is conducted, and first-section leachate and phosphorus-containing filter residues are extracted; s3, oxalic acid is added into the first-stage leachate for a mixed reaction, then solid-liquid separation is conducted, and second-stage leachate and calcium oxalate precipitates are extracted; and S4, phosphorus-containing filter residues are added into the second-stage leachate for mixed reaction, solid-liquid separation is conducted, and third-stage leachate rich in phosphorus and potassium is obtained. Therefore, the limitation of a traditional biological fermentation path is broken through, and liquid phosphorus and potassium elements are directionally and efficiently extracted from the poultry manure.

The invention provides a method for removing oxalate in a sodium aluminate solution, and relates to the technical field of aluminum oxide production processes. The method for removing oxalate in the sodium aluminate solution is used for treating an intermediate product sodium aluminate solution in a Bayer process production process, and mainly comprises the following steps: S10, adding coarse seeds into the intermediate product sodium aluminate solution for producing aluminum oxide by the Bayer process to perform first-stage decomposition, and cooling to 70-75 DEG C to separate out aluminum hydroxide slurry; s20, cooling the prepared aluminum hydroxide slurry to 40 to 50 DEG C; s30, filtering and separating the cooled aluminum hydroxide slurry to obtain a filter cake and a filtrate, and washing the filter cake with a hot liquid to obtain a washing liquid; s40, carrying out causticization treatment on the obtained washing liquid to prepare calcium oxalate; and roasting the obtained filter cake to prepare aluminum oxide. According to the invention, the operation difficulty and equipment requirements of alumina production can be reduced, and water consumption and power consumption are reduced.

The present invention discloses a walnut-specific fertilizer and a preparation method thereof, belonging to the field of walnut-specific fertilizer preparation. The raw materials for preparation include modified expanded perlite, soybean meal, sesame cake and residue, bone meal, humic acid, fulvic acid, Bacillus, Aspergillus niger, yeast, lignin, potassium sulfate, monoammonium phosphate, and calcium oxalate. The preparation steps include: pretreatment, fermentation, and granulation and packaging. The resulting walnut-specific fertilizer effectively solves the problem that bio-organic fertilizers, after application to the soil, have a short action time, tend to lose their effectiveness quickly, and require multiple topdressings, making the planting process cumbersome.

A method of extracting calcium ions from soil including: mixing soil with a solvent to produce a soil slurry; mixing the soil slurry with ammonium acetate to produce an extracted sample; filtering the extracted sample to produce a first filtrate; mixing the first filtrate with a precipitation reagent to produce precipitated calcium oxalate and a liquid solution; and separating the calcium oxalate from the liquid solution; wherein the precipitation reagent comprises from about 0.15 to about 0.35 M of an oxalate salt dissolved in a buffer having a pH from about 7.1 or more. Also, a system and a kit using the method.

The invention relates to the technical field of deep processing of rosin, in particular to a method for preparing rosin methyl ester by adopting a composite catalyst, a product and application. The composite catalyst is selected from p-benzene methanesulfonic acid and two or more of calcium citrate, calcium acetate and calcium oxalate. Compared with rosin, the methanol used in the method disclosed by the invention is less in mass, a washing process is not needed, and the method has the advantages of energy conservation, environmental protection, reduction of production cost and improvement of efficiency. The viscosity of the rosin methyl ester prepared by the method is 240-280 cps at 50 DEG C, the acid value is 5-10 mgKOH / g, and the color is less than or equal to Ghana color No. 2.

This invention relates to a comprehensive evaluation method for the quality of Pinellia ternata and a method for constructing a fingerprint spectrum of Pinellia ternata. The method includes: processing Pinellia ternata to obtain a test solution; preparing a reference solution containing guanosine, phenylalanine, VGTNY, tryptophan, LFSG, apigenin-6-C-arabinose-8-C-galactoside, PWVPG, NIPF, and VIYGPSVF; injecting the test solution and the reference solution separately into a liquid chromatography-mass spectrometry (LC-MS) instrument, and obtaining the fingerprint spectrum of the Pinellia ternata using LC-MS. A method for determining the content of toxic components calcium oxalate needle crystals and lectin protein is also established. The comprehensive evaluation method for the quality of Pinellia ternata provided by this invention comprehensively improves the evaluation standards for Pinellia ternata, ensuring the effectiveness and safety of Pinellia ternata in clinical use.

This invention provides a wettable powder of imidacloprid, the raw materials for which include: imidacloprid, a wetting and dispersing agent, a filler, and other additives, wherein the imidacloprid content is 15-25 wt%. The wetting and dispersing agent includes anionic, nonionic, and inorganic dispersants. The filler includes one or more of silica powder, quartz powder, clay, calcium oxalate, mica powder, carbon black, calcium sulfate, and alumina. This invention provides a wettable powder with excellent suspension and wettability.

The invention provides an ammonium sulfate refining method and application, the method comprises the following steps: providing a crude ammonium sulfate aqueous solution, the crude ammonium sulfate aqueous solution comprises NH4 < + >, SO4 < 2->, Fe < 2 + >, C2O4 < 2-> and Mn < 2 + >; adjusting the crude ammonium sulfate aqueous solution to be alkaline, so that Fe < 2 + > is converted into ferric hydroxide precipitate; adding calcium hydroxide into the crude ammonium sulfate aqueous solution to convert C2O4 < 2-> into calcium oxalate precipitate; adding soluble phosphate into the crude ammonium sulfate aqueous solution to convert Mn < 2 + > into phosphate precipitate of manganese; and filtering the crude ammonium sulfate aqueous solution containing the ferric hydroxide precipitate, the calcium oxalate precipitate and the manganese phosphate precipitate, and evaporating and crystallizing the filtrate to obtain ammonium sulfate. According to the method, Fe < 2 + >, C2O4 < 2-> and Mn < 2 + > in the crude ammonium sulfate aqueous solution are respectively precipitated and removed by using different precipitants, so that the contents of Fe < 2 + >, C2O4 < 2-> and Mn < 2 + > in the crude ammonium sulfate aqueous solution can be effectively reduced, the purity of ammonium sulfate is improved, and the method is suitable for industrial production and application.

The present invention relates to a method for quantifying calcium oxalates contained in a sample of a surface formation or biomass, in which the sample is heated in an inert atmosphere from an initial temperature of 100 to 300°C to a final temperature of 575 to 800°C, and a curve (MES) is measured showing the temperature evolution of the amount of CO released by the sample during heating in an inert atmosphere. Then, the mass of carbon released by the calcium oxalates in the sample as CO during heating in an inert atmosphere is determined from the measured curve (MES) and an interpolation (INTER) of this curve between a first temperature (T1) of 390 to 450°C and a second temperature (T2) of 550 to 590°C. Then, using an exponential relationship, we deduce the mass of calcium oxalates in the sample. Figure 2 to be published.

The application discloses a synthesis method of a biological source calcium oxalate mineral composite material for selective holding of lead ions and application thereof. The method inoculates a fungal spore suspension in a soluble calcium phosphate deficient stress liquid culture medium, and after the fungus fully releases insoluble phosphorus, a calcium oxalate mineral composite material is obtained by separation. The synthesized calcium oxalate mineral composite material has the characteristics of strong selectivity for lead ions, good adsorption effect and difficulty in desorption, and can selectively adsorb lead from mixed heavy metal waste liquid. The raw materials used in the application are easy to obtain and low in cost. The biological synthesis process is economic, environmental protection, simple in operation, the obtained mineral composite material is strong in acid resistance, storage and use are simple, and has a good application prospect for selective recovery of lead resources in composite heavy metal contaminated wastewater.

The application provides a bacillus amyloliquefaciens and application thereof, and relates to the field of microbial fermentation. Bacillus amyloliquefaciens The strain is named bacillus amyloliquefaciens (B2), is preserved in the China General Microbiological Culture Collection Center, 3, Xili Beichen, Chaoyang District, Beijing, China, and has a preservation date of July 30, 2025 and a preservation number of CGMCC NO.35462. Bacillus amyloliquefaciens The bacillus amyloliquefaciens (B2) provided by the application can be used for degrading calcium oxalate needle crystals in Banxia Qu.

The utility model provides a resourceful treatment system for wastewater of a thermal power plant. The resourceful treatment system comprises a heat exchanger, a pre-sedimentation tank, a first reaction tank, a first concentration tank, a first ceramic membrane device, a second reaction tank, a second concentration tank, a second ceramic membrane device, a nanofiltration device, a high-pressure nanofiltration device, a freezing crystallization device and a hot melting device which are connected in sequence. Through the chemical reaction, the first ceramic membrane device, the second ceramic membrane device, the nanofiltration device and the high-pressure nanofiltration device, the reverse osmosis device and the bipolar membrane device, more than 90% of water in the wastewater of the thermal power plant can be recycled, and Mg < 2 + > ions, Ca < 2 + > ions, Cl <-> ions and SO4 < 2-> ions in the wastewater can be recycled; the strong brine is treated by the bipolar membrane device to obtain NaOH and HCl, so that the dosage of NaOH and HCl can be reduced, and the treatment cost is further reduced; the concentration effect of Mg (OH) 2 and calcium oxalate can be improved through the first ceramic membrane device and the second ceramic membrane device, a sedimentation tank is not needed, and the occupied area of the system is reduced.

The invention provides a treatment method of crystallized oxalate in an aluminum oxide production process, and belongs to the field of solid waste treatment in the aluminum industry. The method comprises the following steps: mixing crystallized oxalate with water to obtain a first mixed solution; oxalic acid is added into the first mixed solution, the pH value of the first mixed solution is adjusted to 5.5-7.0, sodium aluminate in the first mixed solution is leached, and a second mixed solution is obtained; carrying out solid-liquid separation on the second mixed solution to obtain a sodium oxalate-containing solution and solid-phase aluminum hydroxide; dropwise adding a calcium nitrate solution into the sodium oxalate-containing solution until no precipitate is generated in the sodium oxalate-containing solution to obtain a third mixed solution; carrying out solid-liquid separation on the third mixed solution to obtain calcium oxalate and a sodium nitrate-containing solution; the sodium nitrate-containing solution is circulated for mixing with the crystalline oxalate to form a closed cycle. By adopting the method provided by the invention, aluminum hydroxide in the crystallized oxalate can be recovered, and high-purity calcium oxalate can be obtained by reacting the crystallized oxalate with calcium nitrate.

The invention discloses pure polygonatum sibiricum primary pulp as well as a preparation method and application thereof, and belongs to the technical field of deep processing of agricultural products. The preparation method comprises the following steps: performing twice or three times of'boiling-drying 'circular treatment on pretreated rhizoma polygonati to obtain cured rhizoma polygonati; mixing the cured polygonatum sibiricum with water, and grinding to obtain polygonatum sibiricum pulp; and homogenizing and sterilizing the polygonatum sibiricum pulp to obtain the pure polygonatum sibiricum primary pulp. Through a specific'high-pressure boiling-drying 'circulation process and key parameter cooperative control, on the premise of not adding any allogenic material and not using expensive special equipment, irritant free calcium oxalate needle crystals in rhizoma polygonati are thoroughly eliminated, active ingredients such as polysaccharide and saponin are reserved to the maximum extent, and the health-care effect of rhizoma polygonati is improved. The obtained primary pulp has excellent alpha-glucosidase and alpha-amylase inhibitory activity, is excellent in sensory quality and stable in storage, and can be used for preparing functional foods for reducing blood sugar. The method is simple in process, controllable in cost, high in product purity and suitable for large-scale production.