104results about "Silver halides" patented technology

A hydrometallurgical process for the treatment of complex silver-bearing sulfide ores and concentrates that recovers substantially all silver, lead, antimony, zinc, copper and sulfur, along with the chemical reagents utilized during the process. Finely ground ores and concentrates are leached under heat and pressure with water, sulfuric acid, nitric acid, oxygen, and a catalyst, and are further treated to recover silver in the form of silver chloride; iron in the form of iron hydroxide; copper and all traces of soluble toxic metals as sulfides; zinc as zinc ammonium sulfate and specifically nitric acid, sulfuric acid, oxygen, ammonia, and ammonium compounds as valuable fertilizer products.

The invention provides a cellulose/silver chloride composite material and a preparation method thereof. The cellulose/silver chloride composite material is quickly prepared by adopting microcrystalline cellulose, sliver salt and chlorine compound as the materials, adopting water as solvent and adopting an ultrasonic-wave treatment method. The cellulose/silver chloride composite material prepared by the preparation method disclosed by the invention is uniform in silver/ silver chloride nanometer particle, capable of being uniformly distributed on a cellulose substrate and is extensive in application prospect in the antibacterial filed and the photocatalysis filed. Moreover, according to the preparation method disclosed by the invention, the materials are cheap, the process is simple, the operation is convenient, the preparation is quick and the process conditions are easy to control, so that the production process is greatly simplified, the time is saved and the cost is reduced. Meanwhile, the preparation method is free of any expensive and complex equipment and is beneficial to the industrial popularization.

The present invention relates to the preparation process of nanometer silver iodide powder. Clear silver sulfate water solution containing silver nitrate in 0.1-0.4 M/L and complexing agent in 0.034-0.2 M/L is dropped slowly into clear potassium iodide water solution containing potassium iodide in 0.1-0.4 M/L, complexing agent in 0.034-0.2 M/L and dispersant in 0.01-0.04 M/L at normal temperature and normal pressure via stirring, and the product is let stand to deposit to obtain nanometer silver iodide deposit. The nanometer silver iodide deposit is filtered, washed and dried at 80-100 deg.c for 1-2.5 hr to obtain nanometer silver iodide powder with granularity below 100 nm. The process is easy to control, pollution-free and suitable for industrial production, and the product has high quality and low cost.

The invention discloses a method for preparing high temperature-resistant nano AgCl sol, comprising the steps of: a. preparing soluble chloride solution 0.01-0.2 mol/L, mixing it with dispersant 0.01-2 mol/L in the molar mass ratio of 1 to (1-4), and dispersing uniformly at a speed of 400-1000 r/min; b. heating the prepared solution to 25 deg.C-100 deg.C, regulating pH value of solution to 2-9, uniformly dropping in AgNO5 0.05-0.5mol/L and dispersant 0.01-2mol/L in the molar mass ratio of 1 to (0.25-10) at a speed of 0.01-0.1 ml/min, and dispersing uniformly at 1000-1500 r/min for 10-45 min, and processing the prepared nano sol with ultrasonic for 1 h. And its beneficial effect: at a certain temperature, the absorption of nano silver sol on fabric is high, and the nano silver sol is firm to absorb and uneasy to wash out.

The invention relates to a method of preparing a nano-scale silver chloride powder by semi-solid-state method. The method comprises the steps of adopting AgNO3 and KCI as reactants, and adopting sulfonating succinate, polyethylene glycols or fatty alcohol polyethenoxy ether as dispersants, to respectively formulate a sulfonating succinate dispersant solution, a polyethylene glycol dispersant solution or a fatty alcohol polyethenoxy ether dispersant solution; adding any dispersant solution into the reactant KCI before the reaction of the reactant to obtain a reaction material with good moisture dispersion; adding AgNO3 powder to KCI with good moisture dispersion; adding the dispersant solution additionally according to the moistening degree of AgNO3, so as to cause AgNO3 to reach the moistening degree; conducing the in-situ semi-solid-state reaction process under grinding; conducting the procedures of in-situ purification of a product, the drying of the product and the grinding and the shaping of the product to obtain the silver chloride powder. By the method, the yield can be reach up to 91 percent to 95 percent. The prepared silver chloride powders are nano-sclae silver chloride powders which have regular spherical shapes, clear boundary lines among particles, high dispersion state, uniform distribution of particles and average fineness being 50-70nm.

The invention provides a method for removing fluorine and chloride ions from high-concentration industrial waste acid and belongs to the technical field of high-concentration industrial waste acid treatment. The method comprises the steps that a rare earth hydroxide solution and a fluorine removal agent of oxalic acid are added to the high-concentration industrial waste acid to carry out defluorination treatment to obtain a slag phase and a liquid phase; then a slag phase alkali solution obtained after the defluorination treatment is carried out is separated to obtain easily-dissolved fluorideand rare earth hydroxide precipitation, and the rare earth hydroxide precipitation and the oxalic acid serve as the fluorine removal agent to carry out new-round defluorination treatment; and meanwhile, a silver nitrate solution is added to the liquid phase obtained after the defluorination treatment to obtain silver chloride precipitation and high-concentration acid, and the high-concentration acid is used in the stainless steel acid pickling working procedure. According to the method, the fluorine and chloride ions can be removed from the high-concentration industrial waste acid, the fluorine removal agent can be recycled, resources are saved, and the requirement for environmental protection of clean production is met.

The invention discloses a park floor lamp capable of automatically dissipating heat and expelling insects. The lamp comprises a lamp shell and a lamp tube installed in the lamp shell, an installationgroove is formed in the lamp shell, the installation groove is located above the lamp tube, a light-transmitting plate is connected to the groove opening of the installation groove in a sealed mode, an equipment groove is formed in the light-transmitting plate, and a plurality of shading plates are symmetrically and rotationally installed in the equipment groove through a rotating shaft. The decomposition characteristic of the driving agent is utilized, when the lamp tube works, the heat dissipation fan can be autonomously driven to periodically rotate forwards and backwards, so that hot air in the shell is intermittently exhausted, and external cold air is sucked in, the flowing speed of gas in the shell and outside gas is increased, the heat dissipation effect is good, energy conservation and environmental protection are achieved, meanwhile, with forward rotation of the heat dissipation fan, the atomization spray head can spray stored insect expelling liquid to the ventilation groove, insects can be prevented from being gathered in the ventilation groove, and normal use of the heat dissipation opening is guaranteed.

The invention provides a preparation method of a solid non-polarized electrode resistant to a deep sea pressure. The preparation method of the solid non-polarized electrode resistant to the deep sea pressure comprises the following steps: preparing a silver ammonia solution by using AgNO<3> and ammonia water, and adding a NaCl solution to the silver ammonia solution to obtain a silver chloride precipitate; washing the silver chloride precipitate clean to obtain a AgCl powder after drying; mixing the AgCl powder with a nano silver powder and a binder and screening to obtain an electrode powder;and pressing the screened electrode powder under a certain pressure for molding; and in the molding process, carbon fibers woven into a grid shape are added to the electrode powder, and the molded green body is sintered under a gas atmosphere, so that the solid non-polarized electrode is obtained. The preparation method provided by the invention is simple; and the solid non-polarized electrode prepared by the preparation method provided by the invention has high mechanical strength, can withstand deep sea pressure, and has small electrode difference and stable performance, which can be used for detecting electric field signals in deep sea environment.

The invention discloses a high-activity three-dimensional dendritic silver chloride crystal growing in direction (111) and a preparation method of the high-activity three-dimensional dendritic silver chloride crystal. The crystal has a three-dimensional dendritic structure; and the three-dimensional dendritic silver chloride crystal is obtained through the following steps of: dissolving an oxidant in de-ionized water and thoroughly stirring for 2 minutes at the room temperature; adding sodium chloride to the stirred solution and evenly mixing the mixture by stirring for 2 minutes; next, adding citric acid to the mixed solution, stirring for 2 minutes, and then putting a silver slide into the solution for reaction at the room temperature for 2-4 hours, thereby obtaining the target product. The invention also provides a photocatalyst prepared from the silver chloride crystals under illumination. The preparation method of the high-activity three-dimensional dendritic silver chloride crystal is simple in synthesis method and steps; the product is good in uniformity and suitable for large-scale production; the synthesized three-dimensional dendritic silver chloride crystal has surfaces formed by high-index crystal faces, and is high in surface activity; and the photocatalyst formed from the silver chloride crystals under illumination has strong catalytic activity.

The invention discloses a preparation method of a rod-shaped AgBr nanometer material, and belongs to the technical field of preparation of inorganic compound new-energy materials. According to the preparation method, the rod-shaped AgBr nanometer material is prepared by adopting a hydrothermal method and taking sodium bromide, silver acetate, dimethyl sulfoxide and polyvinyl pyrrolidone as raw materials. The preparation method particularly comprises the following steps of: dissolving the polyvinyl pyrrolidone and the sodium bromide into a dimethyl sulfoxide/deionized water mixed solvent at room temperature, and then slowly dropping a silver acetate water solution to generate a precursor; carrying out hydrothermal reaction in a reaction kettle at 130 DEG C for 2-14 hours; and after the hydrothermal reaction is finished, centrifugalizing, washing by using deionized water and anhydrous ethanol for multiple times, and drying to obtain the rod-shaped AgBr nanometer material. The preparation method disclosed by the invention has the advantages of easiness for operation, low raw material price, high yield, and the like.

The invention relates to a high-activity cubic-block silver chloride micron-crystal and an electrochemical preparation method thereof. The high-activity cubic-block silver chloride micron-crystal is of pure cubic-phase silver chloride and has a {100}-face-exposed crystal face structure. The method comprises the steps of adding sodium sulfate into a certain volume of deionized water, stirring to dissolve solids, then, adding sodium chloride, and stirring for mixing uniformly; transferring the prepared mixed solution into an H-shaped electrochemical reaction tank, adding a silver sheet to one end of the reaction tank, connecting the end of the reaction tank to the positive pole of a constant-potential power supply, adding a platinum sheet to the other end of the reaction tank, and connecting the other end of the reaction tank to the negative pole of the constant-potential power supply; regulating the voltage output by the power supply, oxidizing the silver sheet so as to generate silver ions, reacting for 30-40 minutes at room temperature, filtering and washing precipitates at the bottom of the reaction tank nearby the silver sheet electrode, and drying in a thermostat, thereby obtaining the cubic-block silver chloride micron-crystal. Under visible light, the activity of a photocatalyst formed by the cubic-block silver chloride micron-crystal is relatively high.

The invention discloses a method for recovering silver ions from a tantalum electrolytic capacitor by using novel chelate resin. A preparation method for the chelate resin comprises the following steps: (1) soaking chlorine spheres in N,N-dimethylformamide, which serves as a reaction solvent, until the chlorine spheres are thoroughly swollen; (2) adding 2-amino-4-methylpyridine, which serves as a ligand, and sodium, which serves as a catalyst, into a product of the step (1), and carrying out stirred reaction for 10 hours at the temperature of 80 DEG C under nitrogen protection, wherein the mass ratio of 2-amino-4-methylpyridine to -CH2Cl in the chlorine spheres is 4: 1; and (3) filtering a product of the step (2) so as to obtain a filter cake, firstly, washing the filter cake with the reaction solvent by soaking until a washing solution is colorless, then, washing the filter cake with distilled water, then, repeatedly washing the filter cake with anhydrous ethanol, acetone, diethyl ether and distilled water sequentially, and carrying out vacuum drying on the filter cake at the temperature of 50 DEG C, thereby obtaining the novel chelate resin. The method has the characteristics that the novel chelate resin selectively adsorbs the silver ions in the tantalum electrolytic capacitor, is good in adsorption performance, can be reused and the like.

The invention discloses a preparation method and application of nano silver chloride. The preparation method comprises the following steps: (1) preparing a glycol solution A of silver nitrate with a concentration of 25wt%, a glycol solution B of soluble chloride with a concentration of 10wt%, and a glycol solution C of a protective agent with a concentration of 1-3wt% respectively; (2) heating thesolutions A, B and C obtained in step (1) to 40 DEG C, dropping the solution A and the solution B into the solution C at a rate of 0.5-100 mL/min, and at the same time of dropwise addition, stirringthe solution C at a speed of 500rpm; and (3) after the dropwise addition is completed, keeping the temperature at 30 DEG C for continuous reaction for 15-90min to obtain a nano silver chloride colloid. The nano silver chloride prepared by the method provided by the invention is small in particle size, and uniform in appearance and particle size, and can be used for preparing photochromic glass, aphotocatalyst, a medicine, an antibacterial agent, a composite material, an electrode material and a photocatalyst for degrading organic matters.

The invention discloses a preparation method of a composite photocatalyst Ag/AgCl@Co3O4 and the composite photocatalyst prepared by using the preparation method. The preparation method comprises the following steps: (1) subjecting a 2-methylimidazole solution and a cobalt salt solution to mixing and reacting so as to obtain ZIF-67; (2) calcining the ZIF-67 at a temperature of 350 to 700 DEG C to obtain Co3O4 nanoparticles; (3) dispersing the Co3O4 nanoparticles in an organic solvent to prepare a Co3O4 suspension; (4) adding a silver salt into the Co3O4 suspension, and carrying out stirring toobtain a mixed suspension; and (5) adding a cobalt chloride solution into the mixed suspension, carrying out stirring, and performing irradiating with ultraviolet visible light to obtain the compositephotocatalyst Ag/AgCl@Co3O4. The composite photocatalyst is uniform in particle, good in stability, high in cyclic utilization rate and good in absorption performance in ultraviolet and visible lightregions, so the composite photocatalyst has excellent photocatalytic degradation efficiency, the removal and degradation efficiency of organic matters in wastewater is greatly improved, and the composite photocatalyst has good application value and prospect in the field of photocatalysis.