47results about How to "Highly selective separation" patented technology

The invention discloses a method for efficiently separating lignin from agricultural waste by using a composite ionic liquid system. The method comprises the following steps: (1) preparation of composite ionic liquid: subjecting composite ionic liquid with cooperative effect to mechanical mixing or double-anion ion exchange; (2) pretreatment of agricultural waste: fully drying the agricultural waste, then crushing the agricultural waste to a size of 20 to 60 meshes by using a mechanical crushing method, washing the soluble components of crushed agricultural waste with acetone and deionized water successively and thoroughly drying the agricultural waste for subsequent usage; and (3) and delignification of the agricultural waste: fully mixing 5 to 500 g of the composite ionic liquid with 1.5 to 60 g of the agricultural waste and carrying out a reaction in an inert atmosphere at a temperature of 120 to 260 DEG C under stirring so as to obtain high-purity lignin and biological micromolecular substances. According to the method, the content of the obtained lignin is high; the usage amount of the ionic liquid is low; and the composite ionic liquid is cyclically usable and does not need addition of deionized water.

The invention discloses an isoindigo conjugated polymer, a semiconductor CNT ink, and a preparation method and an application of the polymer. The isoindigo conjugated polymer comprises a composition unit represented by a formula shown in the description; and in the formula, R1 comprises any one of a heteroalkyl group, and a C1-20 linear or branched alkyl group, R2 comprises any one of a hydrogen atom, a heteroalkyl group, a halogen atom, a C1-20 linear or branched alkyl group, Ar comprises a conjugate unit composed of any one or two or more of one to four five- or six-membered aromatic ring, five- or six-membered aromatic heterocyclic group and a polybasic aromatic fused ring, and n is any integer in a range of 2-500. The isoindigo conjugated polymer can specifically bind to semiconductor carbon nanotubes, so the isoindigo conjugated polymer can be used in the highly selective separation of the semiconductor carbon nanotubes in commercial carbon nanotubes; and the isoindigo conjugated polymer can form the semiconductor carbon nanotube (CNT) ink having high purity, and the ink can be used for constructing a semiconductor device having superior performances.

Disclosed is a selective separation and recycling method for industrial solid waste slag. The selective separation and recycling method is suitable for recycling the solid waste slag generated in steel, metallurgy and chemical industries. The selective separation and recycling method is based on the systematic study of the microstructure of the industrial solid waste slag, high-selectivity chemical agents are adopted, through soaking, milling, magnetic separation, multistage sedimentation and other process steps, bonding materials between crystalline particles are dissolved or softened, and thus spatial dissociation of the crystalline particles with different components is achieved with a chemical method. Meanwhile, the surface characteristics of certain crystalline particles are changed selectively through the high-selectivity chemical agents, the differences of the sedimentation performance of different components are enhanced, separation of multistage sedimentation is completed conveniently, thus the separation efficiency is improved, energy consumption can be reduced by a large margin, and the treatment process is simplified. The selective separation and recycling method is suitable for recycling steel slag, stainless steel slag, metallurgy waste slag and the like and can also be used for recycling useful components or enrichment of certain trace elements from chemical solid waste slag.

The invention belongs to the technical field of ore flotation, in particular to a selective oxidation method for pyrite gangues in sulfide ores. The method comprises treating slurry containing the sulfide ores and an oxidant by a catalyst of a structural formula 1 under radiation of light and performing photo-catalytic selective oxidation on the pyrite gangues in sulfide ores. The method further comprises a means of pre-treating the sulfide ores based on the selective oxidation method and then performing flotation separation. According to the technical scheme, photo-catalysis mediated by the formula 1 can oxidize iron sulfide gangue minerals in the sulfide ores specifically, such that it is favorable for flotation separation of iron sulfide gangues and useful sulfide ores.

The invention discloses a method for separating lead ions in waste water by utilizing single-arm bonded alicyclic crown ether silicone resin, and belongs to the technical field of heavy metal ion separation. Firstly, the single-arm bonded alicyclic crown ether silicone resin is added into the leady waste water, according to the ratio of 0.01 to 1.0 of the weight of the single-arm bonded alicyclic crown ether silicone resin to the volume of the leady waste water, and the mixture is stirred or oscillated for 20 to 300 min at the temperature of 5 to 50 DEG C; secondly, solid-liquid two-phase filtration and separation are carried out, the residual concentration of lead ions in the liquid phase is measured, and the separation removal ratio is calculated by comparing the residual concentration with the initial concentration; and finally, the single-arm bonded alicyclic crown ether silicone resin is eluted with a nitric acid solution of 0.01-3 mol/L, washed repeatedly with deionized water and dried to obtain regenerated resin. The method provided by the invention has the advantages of high separation speed, high removal ratio and strong suitability for lead ions in heavy metal waste water; and the material can be used repeatedly and is low in cost.

The invention discloses an imprinted film material for selectively separating drug-resistant bacilli as well as preparation and application thereof, and relates to the field of new materials. The method comprises the following steps: preparing a semi-cured film; preparing and dilution a drug-resistant bacillus suspension, dropwise adding the diluted drug-resistant bacillus suspension onto a sterilized substrate, performing standing treatment, and then removing the solvent in a sterile environment; pressing the substrate loaded with the drug-resistant bacilli into the semi-cured film so as to form prints on the semi-cured film with the drug-resistant bacilli as template molecules, and heating and completely curing the film; stripping the imprinted film from the substrate to obtain an imprinted film precursor, washing off drug-resistant bacilli as template molecules on the precursor, and carrying out silanization treatment on the surface of the precursor to enhance the hydrophilicity ofthe film; and forming a microporous structure into the imprinted film to obtain the imprinted film material for selectively separating the drug-resistant bacillus. On the basis of ensuring the recognition capability of the traditional bacterial imprinting material, the interference of non-drug-resistant bacteria can be avoided, and the drug-resistant bacteria are promoted to generate selective movement and recognition so as to achieve the purpose of selectively separating bacteria.

The invention provides a flotation collecting agent, a flotation reagent and a flotation method for improving the separation efficiency of ilmenite and gangue of ilmenite.The flotation collecting agent comprises a collecting agent A, the collecting agent A has a formula shown in the specification. In the formula, R1 is C1-C15 alkyl, C4-C15 cycloalkyl, allyl, ethynyl, phenyl, benzyl or benzyloxy; and R2 is hydrogen, C1-C15 alkyl, C4-C15 naphthenic base, propenyl, ethynyl, phenyl or benzyl. The collecting agent A serves as the flotation collecting agent of the ilmenite, benefited from the special synergistic effect of the benzene ring and the phosphate group, the collecting agent A shows good flotation selectivity and recovery rate, and the recovery rate and grade of the ilmenite can be improved.

The invention discloses the preparation and application of an aflatoxin B1 aptamer affinity capillary monolithic column. An amino-modified aflatoxin B1 aptamer is modified onan organic-inorganic hybridamino capillary monolithic column through glutaraldehyde coupling and grafting, through the specific affinity effect of the aptamer and aflatoxin B1, the organic-inorganic hybrid monolithic column is high in column permeability and large in specific surface area. The trace, ultra-trace aflatoxin B1 in complex food samples can be separated and enriched with high sensitivity and high selectivity. Thesimple, sensitive and rapid detection of the aflatoxin B1 can be achieved by using a detection instrument together.

The invention belongs to the technical field of zinc smelting, and particularly relates to a method for selectively precipitating magnesium in a zinc-magnesium solution, which comprises the following steps of: adding a pre-reaction solution into the zinc-magnesium solution, carrying out pre-reaction to obtain a pre-reaction solution, respectively forming liquid flows by the pre-reaction solution and a combined precipitator solution, and contacting and mixing the liquid flows of the pre-reaction solution and the combined precipitator solution to carry out magnesium precipitation reaction; and controlling the pH value of the liquid flow mixing system to be 9.5-11, and then carrying out solid-liquid separation to obtain magnesium slag and zinc liquid. The method has excellent zinc and magnesium selectivity, magnesium can be selectively precipitated, and high-purity zinc liquid can be obtained at a high recovery rate.