30 results about "Oxalate crystals" patented technology

The invention relates to a method for preparing zinc oxalate as a zinc oxide powder precursor from middle/low-grade zinc oxide ore and belongs to the technical field of wet method metallurgy. The method comprises preparing a deep eutectic solvent-type ionic liquid from choline chloride and oxalic acid, fragmenting and fine grinding middle/low-grade zinc oxide ore, adding the middle/low-grade zinc oxide ore powder into the deep eutectic solvent-type ionic liquid, carrying out stirring leaching, adding distilled water into the leached ore pulp, carrying out stirring to obtain a uniform mixture, carrying out standing, carrying out solid-liquid separation to obtain a filtrate A and a zinc oxalate-rich filter residue B, preparing a deep eutectic solvent-type ionic liquid, adding the zinc oxalate-rich filter residue B into the deep eutectic solvent-type ionic liquid, carrying out leaching, carrying out solid-liquid separation to obtain a filtrate C and filter residue D, adding distilled water into the filtrate C, wherein the volume of the distilled water is 2-10 times that of the filtrate C, carrying out filtration after white precipitates are precipitated, washing the filter residue and carrying out drying to obtain zinc oxalate crystals. The method realizes effective utilization of middle/low-grade zinc oxide ore and provides a novel approach for deep eutectic solvent use.

The invention relates to a method for producing ferrous oxalate taking bloodstone as raw material with acid- disslovation- irradiation reduction process. It is characterized in that it comprises following steps: disintegrating bloodstone, grinding, refining and getting mineral powder with TFe content larger than 65%; adding mineral powder into ferrous oxalate solution, stirring and extracting at 80- 85 Deg. C for 1- 6 hours; filtering at high temperature, stewing filterate under irradiation for 3d- 7d for reduction, getting light yellow ferrous oxalate crystal, separating crystal and getting vacuum drying it at 60 Deg. C and 13.3 Kpa for 1- 3 hours, getting ferrous oxalate. The invention employs bloodstone to replace ferric persulfate, employs oxalic acid to repalce ammonium oxalate. The invention is characterized by easy to get raw material, simple process, no environmental pollution and suitability for large- sacle industrial production.

The invention discloses quinazoline derivative salt-type crystal forms and a preparation method and application thereof. The quinazoline derivative salt-type crystal forms are specifically the hydrochloride crystal forms A, B, C, D, F, H, I, the sulphate crystal form A, the maleate crystal form A, the succinate crystal form A, the adipate crystal form A, the glycollate crystal form A, the malate crystal form A, the fumarate crystal form A, the benzene sulfonate crystal forms A, B, C, the benzoate crystal form A, the hippurate crystal form A and the oxalate crystal form A of a quinazoline derivative shown in a formula (I). The salt-type crystal form provided by the invention has good stability, can be applied to drugs for treatment of non-small cell lung cancer brain metastasis, meningeal metastases, primary brain cancer or glioma and the like, has good bioavailability, and has great significance for further study of the therapeutic effect of the solid drugs.

The invention relates to a preparation method of monoclinic ferrous oxalate crystal (FeC2O4.2H2O) with particlesize less than 3mum and the monoclinic ferrous oxalate crystal with particlesize less than 3mum obtained by adopting the method. A solid-liquid two-phase method is adopted and the reaction is controlled by controlling the feeding speed of solid oxalate and the temperature and concentration of bivalence ferrous salt solution, thus achieving the purpose of generating the ferrous oxalate crystals with specific crystal formation and particlesize. The method is characterized in that: the solid oxalate is added into the bivalence ferrous salt water solution with concentration of Fe2+ being 0.5-1.7mol/l at the temperature of 40-80 DEG C at the feeding speed of more than 500g/min for reaction by temperature preservation. The method has simple process and high yield. The ferrous oxalate crystal with particlesize less than 3mum is obtained by the method, and the crystal formation is the monoclinic crystal.

The invention relates to a drink composition capable of inhibiting urinary calculi formation and promoting litholysis and an application of the drink composition. The invention relates to a novel application of a garcinia cambogia extract, namely, an application of the garcinia cambogia extract in preparation of food or drugs for inhibiting urinary calculi formation and promoting litholysis. The invention also provides a drink capable of inhibiting urinary calculi formation and promoting litholysis. The drink has the advantages as follows: animal experiments find that the garcinia cambogia extract can inhibit urinary calculi formation and promote litholysis for the first time. The concentration of 24 h urinary oxalic acid and calcium ions in rats in a garcinia cambogia extract interventiongroup is significantly reduced as compared with a calculus induction group; dotted calcium oxalate crystals can be seen in kidney tubules in the garcinia cambogia extract intervention group, flaky calcium oxalate crystals are seldom seen, and the um oxalate crystal deposition and lumen expansion conditions are remarkably better than those in the calculus induction group.

The invention relates to a method for preparing ferrous oxalate by using vanadium slag, and belongs to the technical field of preparation of ferrous oxalate for batteries. The technical problem solved by the invention is to provide the method for preparing the ferrous oxalate by using the vanadium slag. The method includes the following steps: mixing quaternary ammonium salt with oxalic acid to form an eutectic solvent; and adding the vanadium slag into the eutectic solvent for leaching, carrying out solid-liquid separation to obtain a leachate, adding deionized water into the leachate, standing and filtering the mixture, and washing and drying obtained solid to obtain a ferrous oxalate crystal. The method of the invention uses the vanadium slag as a raw material to prepare the ferrous oxalate crystal with high purity and particle size of 0.5-2 [mu]m, which has the advantages of small particle size, uniform size and high purity and can be used as a raw material for synthesizing a lithium ion battery positive electrode material lithium iron phosphate, is low in equipment requirements, short in process flow and environmentally friendly, and can comprehensively utilize valuable metal resources of the vanadium slag. Moreover, the used eutectic solvent has the advantages of environmental protection, simple synthesis and low price.

The invention relates to a production method of doped ferrous oxalate, which takes ferrous sulfate and oxalic acid as raw materials, and comprises the steps of purifying, synthesizing, separating, washing and drying. The production method is characterized in that after purification, when the ferrous sulfate and the oxalic acid are synthesized in water solution, ammonium oxalate and metal salt are added into the solution at 60-140 DEG C and stirred for reaction for 5-40min, wherein the ammonium oxalate has the mass percent concentration of 0.2-1% in reaction liquid, and the adding quantity of the metal salt is 0.1-4% of the mass of the ferrous sulfate. The method leads 2500mu g/g of impurity ions to be doped into ferrous oxalate crystal, thus improving the electric conduction performance of LFP. A lithium battery processed by LFP cathode material prepared by the ferrous oxalate has good charging and discharging characteristics under different multiplying powers, and circulating performance at high and low temperature.

A method for preparing cobalt oxalate by ammonia-free oxalic acid precipitation includes steps: subjecting cobalt-containing waste residues to leaching and decontaminating processes to obtain cobalt chloride solution performing precipitation with oxalic acid as a precipitant, and performing aging, leaching and washing under a stirring state to obtain mother liquor and cobalt oxalate crystal in granularity of 30micron and complete in crystal form. The method has advantages that adding of ammonium-containing compounds such as ammonium salt, ammonium hydroxide or the like is avoided, and ammonium-containing wastewater in a production process is avoided, so that ammonium removal treatment of wastewater in subsequent procedures is avoided, production cost is saved, environmental hazards are reduced, and valuable metal cobalt can be recycled to the utmost extent.

The invention relates to a plant source organic-inorganic compounding molluscicide fertilizer preparation and a preparation method and application thereof, and relates to the technical field of biological pesticides. The plant source organic-inorganic compounding molluscicide fertilizer preparation comprises a needle-like calcium oxalate crystal and an inorganic fertilizer, wherein the needle-likecalcium oxalate crystal is obtained by separating and extracting from a plant of Araceae or Amaryllidaceae. The plant source organic-inorganic compounding molluscicide fertilizer preparation also preferably includes a plant fermented organic fertilizer. A suitable amount of chemical fertilizer is added to a needle-like calcium oxalate crystal extract contained in the plant of Araceae and Amaryllidaceae, and a plant extract residue fermented product is used as an organic fertilizer carrier to prepare the plant source organic-inorganic compounding molluscicide fertilizer preparation. The plantsource organic-inorganic compounding molluscicide fertilizer preparation can not only promote rice growth, increase yield, also has the effect of killing snails and achieve the double effect of killing Oncomelania hupensis to achieve the integration of double effects of molluscicide and fertilizing. In addition, the plant source organic-inorganic compounding molluscicide fertilizer preparation issimple in preparation method, the production cost is low, the use is convenient, and the plant source organic-inorganic compounding molluscicide fertilizer preparation is conductive to large-scale application and promotion in a rice field in a schistosomiasis epidemic area.

The invention provides a method for removing oxalate during alumina production and relates to the technical field of alumina production. The method specifically includes: adding a special crystallizing aid and a CGM crystallizing aid into essential oil, decomposing, filtering to obtain an aluminum hydroxide filter cake, and filtering underflow to obtain oxalate crystal; adjusting decomposing headtank temperature to 56-62 DEG C and decomposing tail tank temperature to 45-49 DEG C, wherein adding amount of the CGM crystallizing aid is 0-25ppm of essential liquid amount, adding amount of the special crystallizing aid is 5-30ppm of the essential liquid amount, and the special crystallizing aid comprises, by mass, 10-30% of oleic acid, 1-5% of C8-10 fatty acid and the balance of water. By adding the special crystallizing aid combined with the CGM crystallizing aid, oxalate is stably precipitated in a spherical form, the head tank temperature and the tail tank temperature are adjusted downwards to lower concentration of oxalate in a solution, and decomposition yield is increased.

The invention provides an oral composition for dissolving calcium oxalate calculus. The composition contains 0.1-10% of garcinia cambogia extract microcapsules or 0.1-10% of hydroxycitric acid or hydroxycitric acid derivative microcapsules. The composition contains garcinia cambogia extract microcapsules, hydroxycitric acid or hydroxycitric acid derivative microcapsules, so that calculus formed bycalcium oxalate crystals can be effectively dissolved; the materials of the garcinia cambogia extract microcapsules, hydroxycitric acid or hydroxycitric acid derivative microcapsules adopt organic polymer materials, which have certain dissolvability and are capable of conveniently controlling disintegration and dissolution time of the composition and protecting effective components in the composition to reach efficient absorption parts. The composition adopts natural extracts, is free of toxic and side effects on human body and excellent in calculus dissolving effect, can be orally taken by broad crowds, is free of strict restrictions on the crowds, and has broad application prospects.

The invention discloses a heterocyclic compound as well as a preparation method and application thereof. Specifically, the invention provides a free alkali crystal form, a hydrochloride crystal form, a sulfate crystal form, a maleate crystal form, a phosphate crystal form, a fumarate crystal form, a mesylate crystal form, an oxalate crystal form and a hydrobromide crystal form of the heterocyclic compound as shown in a formula I, a preparation method of each crystal form and application of the crystal forms in preparation of drugs. Wherein each crystal form has excellent physicochemical properties, so that the compound crystal form is particularly suitable for preparation development, especially as a medicine for treating cancers, and has a good patent medicine prospect. .

The invention relates to a preparation method of a lithium ferrous oxalate ion battery negative electrode material with exposed specific oriented crystal faces. An iron hydroxide precursor is added into a mixed solution composed of additives such as ascorbic acid and oxalic acid in a specific proportion, and synthesis of a ferrous oxalate nano-material exposing different oriented crystal faces is achieved by controlling the reduction dissolution rate of iron hydroxide in the solution and coordinating the nucleation growth process of the ferrous oxalate material. According to the invention, ascorbic acid is adopted to strengthen reduction dissolution of an acidic oxalic acid solution on ferric hydroxide and regulate and control atomic coordination and an initial crystal stacking rate of ferrous oxalate; meanwhile, the atomic coordination environment and the surface energy of ferrous oxalate crystal particles are interfered by using an organic solvent; therefore, the preparation of the ferrous oxalate material with exposed specific oriented crystal faces is achieved. The ferrous oxalate material with the exposed specific oriented crystal face growth can give full play to the advantages of different types of electrochemical reaction ion diffusion microchannels constructed by arrangement of different crystal face atoms and the characteristic of close arrangement of different oriented crystal face atoms to adjust material stress distribution and energy storage catalytic sites, and the lithium storage performance of the ferrous oxalate material is enhanced.

The invention discloses an intelligent identification method and system for calcium oxalate crystals based on microscopic images, and the method comprises the steps: obtaining the training data of thecalcium oxalate crystals, wherein the training data comprises various types of calcium oxalate crystals; training the training data by using a deep convolutional neural network to obtain a deep convolutional neural network model for identifying calcium oxalate crystals; performing feature matching on the microscopic image of the collected sample by using a deep convolutional neural network modelto obtain the crystal type of the calcium oxalate crystal contained in the collected sample; and generating and outputting a calcium oxalate crystal identification result of the collected sample according to the crystal type of the calcium oxalate crystal contained in the collected sample. According to the technical scheme, the problems of large error, long consumed time and low working efficiencycaused by manual identification in the prior art can be solved.

The invention discloses an online hydrochloric acid cyclic utilization method on a steel acid pickling line. The method includes the following steps that firstly, acid pickling liquid on the acid pickling line is collected and filtered and is conveyed to a vapor-liquid separator; secondly, oxalic acid is added into the vapor-liquid separator through a chemical adding device; thirdly, mixed liquid is forcefully cycled between the vapor-liquid separator and an acid-resisting and high-temperature-resisting heating evaporation device, acid vapor and a super-saturated solution containing ferrous oxalate crystals are formed, and the acid vapor is conveyed to the acid pickling line; fourthly, a crystallizing tank is used for separating out ferrous oxalate and conveying the ferrous oxalate to a second filtering device; fifthly, the ferrous oxalate crystals are filtered through the second filtering device; and sixthly, the above steps are repeated. According to the online hydrochloric acid cyclic utilization method on the steel acid pickling line, low-concentration hydrochloric acid obtained after acid pickling is converted into high-concentration hydrochloric acid which can be cyclically used through the oxalic acid and is conveyed to the acid pickling line again, meanwhile, due to the reaction of the oxalic acid and ferrous chloride, the ferrous oxalate is generated and can also be used as a raw material of lithium batteries and the like, cost is saved, and profits are generated.

The invention discloses a method for sealing carbon dioxide. According to the method, carbon dioxide is captured and absorbed by virtue of inorganic base and is directly applied to the production of oxalate, oxalate is taken as a detergent aid to be applied to a clothes detergent, and ucalcium oxalate crystals are formed by oxalate and calcium ions in water, so that the utilization and mineralization sealing of carbon dioxide are realized. Carbon dioxide is absorbed through carbonate and is directly applied to the production of oxalate, so that the loss of a large number of energy sources is avoided in the regeneration process of an adsorbent, and the zero release can be realized in the whole flow; and oxalate prepared during the production of carbon dioxide is taken as the detergent aid,oxalate is combined with the calcium ions so as to generate calcium oxalate precipitates in the washing process of clothes, so that the mineralization sealing of carbon dioxide is realized, and the greenhouse effect is relieved.