42results about How to "Applicable separation" patented technology

The invention discloses a high-throughput high-retention rate composite nanofiltration membrane preparation method. The preparation method comprises mixing polyetherimide and an organic solvent, carrying out stirring, carrying out standing deaeration to obtain a membrane casting solution, pouring the membrane casting solution on a non-woven fabric, carrying out blade coating and volatilization to obtain a wet membrane, immersing the wet membrane in water, taking out the wet membrane, immersing the wet membrane in an ethene diamine solution for a crosslinking reaction, taking out the membrane, washing the membrane through water, sucking water on the membrane to obtain a crosslinked porous support membrane, fixing the crosslinked porous support membrane between a flat plate and a frame, putting the crosslinked porous support membrane in a constant temperature environment, pouring a water phase aqueous solution into the frame, discharging the solution after the reaction, putting the membrane in a constant temperature environment, removing residual moisture on the membrane surface, pouring a trimesoyl chloride solution into the frame, discharging the solution after a reaction and carrying out drying to obtain the composite nanofiltration membrane. The preparation method has simple processes and can be operated easily. The composite nanofiltration membrane has high throughput, a high retention rate and good membrane stability, can retain micromolecular substances, can be used in a water system and can be used for organic system separation.

A method for separating associated fluorite-rich and low-grade cassiterite from tungsten tailings. The tungsten tailings containing fluorite CaF216-25% and tin-SnO20.1-0.3% are directly put into the flotation column for roughing Fluorspar: Separating fluorspar from calcite and iron-containing pyroxene to obtain fluorspar rough concentrate and anti-enrichment tin-containing tailings; the fluorite coarse concentrate is separated by flotation machine for five times to obtain fluorspar Concentrate products and flotation fluorite tailings; the anti-enrichment tin-containing tailings are separated by two-stage separation, and the sub-concentrate is concentrated and rewashed by shaking table re-election technology to obtain tin rough concentrate products and tin tailings. The invention has simple technological process, can reduce the loss of fluorite and cassiterite in the overflow water at the same time, and is beneficial to the improvement of the comprehensive recycling rate of the fluorite and cassiterite.

The invention provides a method for rapidly separating auricularia auricula strains by the utilization of dry auricles. The method includes the steps that (1), the dry auricles are broken off with the hands to be small pieces; (2), the small auricles are washed in sterile water for the first time, and moisture is sufficiently absorbed through absorbent paper; (3), the small auricles are placed into alcohol with the 75% volume fraction, soaked for 20-25seconds and then sufficiently absorbed through absorbent paper; (4), the small auricles are washed in the sterile water for the second time and sufficiently absorbed through absorbent paper; (5), the small auricles are inserted into a plate PDA culture medium for cultivation and observation at constant temperature; (6), germinated hyphae are picked to be inoculated to a slope PDA culture medium and then cultivated in a pure mode. The method for separating the auricularia auricular strains has the advantages of being easy and convenient to operate, short in consumed time and low in needed cost, the hyphae are high in survival rate, rapid in growth, pure white, sturdy and high in vitality, the application range is wide, and the method is suitable for separating kinds of colloid auricularia auricula strains.

The invention provides a preparation method for a monoamine-grafted-and-modified crosslinked polyimide solvent-resistant nanofiltration membrane. The preparation method comprises the following steps: a, preparing a mixed solution from a solvent and a cosolvent according to a mass ratio of 1: 0.1-5; b, adding 15 to 28% of a polyimide solution into the mixed solution so as to prepare a membrane casting liquid; c, adding 2.5 to 20% of monoamine into the membrane casting liquid and carrying out mixing at 25 to 80 DEG C for 3 to 24 h under stirring so as to guarantee complete grafting; d, preparing a membrane by using a immersion-precipitation phases inversion process, washing the prepared membrane with deionized water a plurality of times and standing the washed membrane for subsequent usage; e, preparing an alcoholic solution of diamine with a concentration of 0.5 to 20%; f, putting the prepared membrane in the alcoholic solution of diamine prepared in the previous step for crosslinking modification for 0.25 to 48 h; and g, after completion of the reaction, soaking and cleaning the membrane in an alcohol solvent so as to obtain the polyamide nanofiltration membrane with excellent performance. The polyimide solvent-resistant nanofiltration membrane prepared in the invention has the advantages of simple preparation, adjustable hydrophilicity, outstanding solvent resistance, great permeation flux, a high retention rate, etc. and is applicable to separation of substances in all the organic solvents and to the fields of pharmaceutical manufacturing, biology, catalyst recovery, etc.

The invention discloses a method for preparing a rigid MOF composite membrane used for nanofiltration of organic dyes, comprising the following steps: pretreating the organic polymer base membrane so that its surface has a functional group-COO-; oxidizing the hydrogen Dissolve sodium, acetic acid and metal salts in water to prepare a metal ion precursor solution; place the obtained base film in the metal ion precursor solution and react at 25±2°C for 4‑6h; add a crosslinking agent solution to continue the reaction 10‑50min, wash to obtain a composite film after the end; dissolve sodium hydroxide and squarylium in water, and under the action of ultrasonic stirring, prepare an organic ligand precursor solution; place the obtained composite film in it at 25±2°C React for 30‑120min; take it out, wash it, and dry it to obtain a rigid MOF composite membrane. The preparation method of the membrane in the invention is simple, excellent in performance, low in cost and easy for industrialization. Moreover, the prepared nanofiltration membrane has good separation performance and stability for organic dyes, so it has broad application prospects in the nanofiltration of organic dyes.

The present invention relates to solid phase extraction technology, be the preparation method of the solid phase extraction agent that can be used for plutonium separation, get 3g poly-4-vinylpyridine particle in the round bottom flask, add methyl iodide reagent (analytical grade, Bai Lingwei reagent), in 40 The reaction was stirred at ℃ for 2 h, then rotary evaporated to dryness, and the composition was washed with deionized water for more than 3 times to obtain the desired product. The pyridine solid phase extraction agent provided by the invention has the advantages of large extraction capacity, good selectivity, fast extraction rate, etc., and is especially suitable for the separation of plutonium in plutonium-containing waste liquid.

The invention discloses a coniferous tree seed collection protection device with the function of removing impurities, and relates to the technical field of separation of collected seeds and impurities in the harvesting process of coniferous pine cones and the personal protection of harvesters, including being set in a The support frame in the middle of the main trunk of the coniferous tree, the seed collector located below the support frame and the seed receiving cover installed above the support frame solve the safety problems of the conifer pine cone harvesters and the difficulty in planting. For the problem of carrying and collecting, the present invention adopts an inflatable cushion with a groove and a seed collector with a spring device and a vibrating device, which effectively reduces the damage received by the harvester after accidentally falling, and effectively prevents the fall from falling. Collect the pine cones to prevent loss and separate the impurities that fall into the seed collection box.