38results about How to "Avoid dissolution loss" patented technology

The invention belongs to the technical field of preparation of functional high polymer materials, and particularly relates to a natural high polymer material modified adsorption resin for the adsorption of heavy metal ions and a preparation method for the adsorption resin. The heavy metal ion adsorption resin comprises the following components in percentage by weight: 10.0 to 15.0 percent of chitosan (Chit), 25.0 to 50.0 percent of acrylic acid (AA), 20 to 45 percent of acrylamide (AM), 0.1 to 0.4 percent of N,N-methylene-bisacrylamide (NMBA), 1.0 to 3.0 percent of potassium persulfate (KPS) and 0.0 to 15.0 percent of wood meal. By the heavy metal ion adsorption resin, Pb2+ can be efficiently adsorbed and separated, the cost of a chitosan modified adsorption resin can be lowered, adsorption capacity can be improved, the number of reuse times can be increased, and the adsorptive selectivity of the resin can be improved.

The invention belongs to the technical field of smoke detection and particularly relates to an online monitoring system of ultralow-concentration smoke and an analysis method thereof. The online monitoring system of ultralow-concentration smoke disclosed herein comprises a smoke sampling system, a gas pretreatment system, a dried compressed air generating system, a gas component analysis system, a temperature-pressure flow measuring system. The invention also discloses the analysis method relating to the online monitoring system of ultralow-concentration smoke. The online monitoring system of ultralow-concentration smoke and the analysis method have the advantages that the gas sampling system provides thermal treatment, dissolution loss of measured gas due to high-humidity environment in a flue is prevented effectively, flow speed measuring is stable and reliable, the flow speed can reflect working conditions better, the sample gas pretreatment system is researched and designed independently, the special material selected can remove moisture in smoke within a short time, gas component loss is avoided, operation configuration software has a friendly interface, data are visually displayed, and operation is simple and feasible for a user.

The invention belongs to the technical field of methods for determining lead content in ore and in particular relates to a method for determining lead content in multi-metal ore. The method comprisesthe following steps: removing silicon with ammonium fluoride, dissolving a sample with a saturated nitrate-potassium chlorate solution, precipitating lead with sulfuric acid, eliminating arsenic, antimony and tin with hydrobromic acid, filtering to separate lead sulfate from partial interfering ions of copper, iron and zinc, dissolving the precipitate with an acetic acid-sodium acetate buffer solution, titrating with an EDTA (Ethylene Diamine Tetraacetic Acid) standard solution, concentrating the filtrate, determining the lead content in an acidic medium by using an atomic absorption spectrometer, adding results obtained during EDTA titration and atomic absorption spectrometry to obtain the total content of lead in the ore. Aiming at determination of the lead content in the multi-metal ore, interference can be effectively eliminated, lead content loss is avoided, and the experimental accuracy is improved.

The invention relates to the technical field of metal ion extraction, in particular to an improved method for extracting metal by a polymer matrix three-liquid-phase system. The method comprises the following steps: adding phase polymers and polymers decorated through EDTA (Ethylene Diamine Tetraacetic Acid), inorganic strong electrolyte salt and an organic solvent immiscible with water into a water solution containing various metal ions to be extracted, adjusting the pH value of the mixed solution, mixing sufficiently and centrifugally separating phases to obtain an upper, middle and lower three-layer concomitant liquid-liquid-liquid three-phase system. Different metal ions are respectively enriched into an upper phase, a middle phase or a lower phase due to the difference of combination capacities with EDTA. In the method disclosed by the invention, the cooperation of the metal extraction performances of the organic solvent phase and EDTA decorated polymers is fully exerted, and through the different distribution among different liquid phases, the extraction selectivity of a broad spectrum extraction agent and a coordinating agent is greatly improved, and the method has broad application prospects in the aspects of environmental sample analysis and test and resource recycling.

The invention belongs to the field of biological filler, and discloses honeycomb-shaped biological filler suitable for microbiological treatment of wastewater as well as a preparation method and application thereof. The honeycomb-shaped biological filler is prepared from the following preparation raw materials in percentage by mass: 7.1 to 33 percent of a mineral material, 7 to 28 percent of a microporous material, 2 to 10 percent of a pore forming agent and 30 to 60 percent of an inorganic gel material. The pore forming agent can be removed during a preparation process through roasting, coarse pores can be formed, a microporous structure of filler is formed by micro pores brought by the microporous material per se and fine pores formed through accumulation of inorganic particulate matters, an appropriate habitat for microorganism reproduction and growth is formed by enriched hierarchial pore channel structures, sufficient specific surface area and pore walls for supplying trace mineral elements to microorganisms, biofilm forming of the microorganisms on the filler is promoted, conditions are created for matter and energy exchange between the microorganisms and wastewater, and therunning efficiency of the biological filler is increased.

The invention provides a modification method of fenugreek polysaccharide gum. Graded screening is utilized to remove impurities with high water-insoluble substance content in the fenugreek polysaccharide gum sheet; and a physical process is utilized to perform modification (wetting fenugreek polysaccharide gum with a 15% ethanol water solution) and wall-breaking tackifying treatment, thereby greatly enhancing the apparent viscosity of the fenugreek polysaccharide gun and greatly lowering the water-insoluble content in the fenugreek polysaccharide gum.

The invention belongs to the technical field of environmental monitoring, in particular to a pretreatment method for dehydrating, dedusting and retaining components to be detected in boiler smoke detection. The method includes that smoke is fed into corresponding buffer solution according to the properties of the smoke to be detected, components with properties opposite to the component to be detected are removed, and meanwhile water vapour and dust in the smoke are absorbed; the buffer solution is divided into sulphur retaining buffer solution and ammonia retaining buffer solution; and sulphur retaining drying agent or ammonia drying agent mixed by analytical reagent is fed in when the humidity of the smoke after being treated is more than or equal to 50%, so as to realize further dehydration. By adopting the method of the invention, dissolution loss of sulphur dioxide or ammonia can be avoided even if cooling dehydration is carried out on high humidity low concentration smoke, and meanwhile the technical problem that dedusting instrument pipeline is easy to be blocked can be efficiently solved, so that a measuring instrument can continuously operate for a long time in an almost dry and dustless environment and is difficult to damage and service life is prolonged.

The invention discloses a low-cost high-efficiency open circuit and resource utilization method of arsenic in copper electrolysis, which adopts a circulating process of removing arsenic from open circuit electrolyte by a titaniferous precipitant, performing alkaline leaching regeneration on arsenic precipitation slag, acidizing and removing sodium by a regenerated precipitant, and performing reduction and electrodeposition on an arsenic-containing alkaline leaching solution to prepare metal arsenic. According to the method, efficient removal and resource utilization of arsenic in the electrolyte can be achieved, formation of particle floating objects and dissolution loss of titanium salt in the precipitant can be avoided, and the influence on an electrolysis system is eliminated.

The invention discloses a Pt or Au modified porous PdFe intermetallic compound, and a preparation method and an application thereof, and belongs to the technical field of electrochemistry. An intermetallic compound is a nanoparticle; an inner core of the nanoparticle is an ordered PdFe intermetallic compound; the surface of the nanoparticle is of a porous structure with uniformly distributed Pd; and the surface of the porous structure is modified with Pt or Au. The preparation method comprises the steps of using palladium acetate and ferric salt as metal sources, and loading the metal sourceson a carbon carrier; then thermally decomposing acetate in a protective atmosphere to obtain a supported PdFe intermetallic compound; and after Fe on the surface is etched away, adopting a surface modification technology to prepare the Pt or Au modified PdFe intermetallic compound with the porous surface and the ordered inner core. The Pt or Au modified porous PdFe intermetallic compound preparedby the method shows relatively high activity and stability as a negative oxygen reduction reaction catalyst and a positive hydrogen oxidation reaction catalyst of a fuel cell.

The invention provides a molecular cage modified fuel battery proton exchange membrane and a preparation method thereof. Benzenetricarboxaldehyde and hydrated heteropoly acid are added into an ethyl acetate solvent; after stirring treatment, an ethylenediamine solution is added; an organic molecular cage coated heteropoly acid particle colloid material is obtained through heat treatment; then, mixing and ball milling are performed on the organic molecular cage coated heteropoly acid particle colloid material and solid nafion resin powder in an organic solvent; casting film forming is performedto obtain the molecular cage modified fuel battery proton exchange membrane. The method has the advantages that an organic molecular cage coat the heteropoly acid particles; the escape of the heteropoly acid particles from the molecular cage is effectively controlled; water molecules can freely flow inside the molecular cage; the dissolution loss of heteropoly acid is effectively avoided; the stability of the heteropoly acid compounds is improved; meanwhile, the whole protolysis rate of the film material cannot be reduced; meanwhile, in the preparation, the compounding conditions are simple,so that the technical flow process is simplified; the mass production of the proton exchange membrane can be promoted.

The invention discloses a processing method for natural cooling composite yarn. The processing method comprises the following steps of adding water into cyclodextrin, heating and dissolving to preparea saturated solution, adding peppermint oil after refrigeration and carrying out ultrasonic oscillation; adding high-temperature active bamboo charcoal powder after ultrasonic oscillation, carrying out ultrasonic oscillation, and drying to obtain natural cooling powder; adding the natural cooling powder into a banana fiber obtained by oil feed humidification, stowing and preserving, stretch breaking and opening and cleaning, and drying after mixing; mixing cotton fibers and obtaining blended yarn after cotton carding, drawing, roving, spinning and winding; and twisting the blended yarn and jade cold-feeling fibers to the composite yarn and obtaining a finished product. According to the processing method, a cooling effect can be improved, the cooling duration can be improved, the cooling stability can be improved, and the daily washing can be facilitated.

The invention discloses a crystallization modifier capable of improving properties of chemical drug raw material powder and a preparation method for the crystallization modifier. The crystallization modifier is a drug-containing granule obtained by filling, adhering and polymerizing a modifier among chemical drug raw material crystals. The preparation method comprises the following steps: (1) crushing and screening chemical drug raw material crystals; (2) mixing a modifier solution with the chemical drug raw material crystals, and filling, adhering and polymerizing the modifier among the chemical drug raw material crystals to obtain the drug-containing granule; (3) drying and screening the drug-containing granule. According to the crystallization modifier, a direct tableting technology is further developed in practical application, and the drug stability can be improved.