7 results about "Silver preparation" patented technology

The application belongs to the field of sewage treatment, and specifically discloses a lead-bismuth smelting wastewater treatment method. The method comprises the following steps: (1) performing a sulfidation reaction on waste acid wastewater and desulfurization and denitrification wastewater with a sulfidation agent, and obtaining first filtrate through solid-liquid separation; (2) mixing the first filtrate with chlorine washing wastewater and silver preparation wastewater, and sequentially performing oxidation treatment, iron-based flocculation treatment, fluorine ion precipitation treatment and flocculation treatment, and obtaining second filtrate through solid-liquid separation; (3) adjusting the second filtrate to an alkaline condition, and sequentially performing thallium removal treatment, calcium ion precipitation treatment and secondary flocculation treatment, and obtaining purified filtrate through solid-liquid separation. The application combines modular treatment units with a collaborative process to construct an efficient and economical multi-medium wastewater treatment system.

The application relates to a silver spraying system and a silver spraying process. The silver spraying system comprises a high-speed spraying tank, a spraying power supply, a mother tank and an automatic silver ion supplementing system. The automatic silver ion supplementing system comprises a silver preparation tank, a silver preparation power supply and a control host. The control host is used for detecting the current of the spraying power supply through a signal line and controlling the silver preparation power supply to output a silver preparation current with the same size as the spraying power supply. When silver ions in the electroplating solution in the high-speed spraying tank are consumed and the silver ion concentration decreases, silver ions generated through the silver preparation tank are supplemented into the high-speed spraying tank, so that the silver ions are automatically supplemented, the concentration of the silver ions in the high-speed spraying tank is maintained, the silver plating effect of the workpiece to be plated is improved, and the convenience of supplementing silver ions in the electroplating solution is improved. The mother tank can play a buffering role to reduce the influence of the increased electroplating solution on the concentration of the electroplating solution remaining in the high-speed spraying tank, so as to ensure the spraying effect of the workpiece to be plated.

The invention discloses a preparation method of 5N-grade high-purity silver. The preparation method comprises the following steps that 1, a concentrated HNO3 solution with the molar concentration being 14-18 mol / L is prepared; 2, turning the coarse silver, wetting the coarse silver with pure water, and adding the coarse silver into the HNO3 solution obtained in the step 1; 3, heating the mixture obtained in the step 2, keeping the temperature, and carrying out chemical reaction; 4, adding a certain amount of pure water into the silver nitrate solution obtained in the step 3; 5, concentrated nitric acid is added into the silver nitrate solution diluted in the step 4; step 6, preparing an electrolytic bath, an anode plate, a cathode plate and a conductive rod; 7, preparing an electrolyte; 8, after the electrolytic cell is installed, the electrolyte is introduced into the electrolytic cell, and finally direct current is introduced; ninthly, after electrolysis is completed, the negative plate is taken out, and silver on the negative plate is stripped; and tenthly, the silver obtained in the ninth step is dried, and 5N high-purity silver is obtained. According to the preparation method, the high-purity silver preparation process can be shortened, and energy consumption is reduced.

The invention relates to the technical field of medical raw material preparation, in particular to a method for green synthesis of nano-silver particles based on agriophyllum squarrosum extract and application. The agriophyllum squarrosum extract is loaded on nano-silver particles by adopting a mixed heating and multiple centrifugation method. The method disclosed by the invention is simple and convenient to operate, free of complex equipment or toxic chemical reagents, environment-friendly and relatively low in cost. The prepared nano-silver particles are uniform in particle size and good in dispersity, the average particle size is about 11 nm, the surfaces of the nano-silver particles are negatively charged, and the stability of the nano-silver particles is high. Biosafety evaluation shows that the particles have no obvious toxicity to fibroblasts at a relatively high concentration and have good biocompatibility. The prepared nano-silver particles can effectively promote migration and proliferation of fibroblasts, have the healing effect superior to that of a single agriophyllum squarrosum extract or a commercial nano-silver preparation in a mouse wound healing model, and can accelerate the wound repairing process.

Preparation method of silver standard sample for impurity elements, characterized in that it includes: preparation of reagent materials → solution preparation → preparation of silver powder → smelting of silver standard sample → secondary smelting → analysis test and value determination detection.

The present invention relates to the technical field of the preparation of nano-silver materials, and particularly to a method for preparing nano-silver by a multi-liquid phase method. A method for preparing nano-silver by a multi-liquid phase method includes the following steps: Step S1, preparing liquid A: uniformly mixing a mixed surfactant, an organic silver source and an oil-soluble organic solvent to obtain liquid A, wherein the mixed surfactant is a mixture of two or more organic amines, and the mixed surfactant includes at least one saturated amine and at least one unsaturated amine; Step S2, preparing liquid B: dissolving a reducing agent in water to obtain liquid B. The method for preparing nano-silver by the multi-liquid phase method can prepare nano-silver particles with good dispersion and uniform size, achieve the effect of controlling the dispersion of silver powder, and has simple operation and low requirements for equipment, being suitable for large-scale industrial production, and solving the problems of poor dispersion and uneven particle size of the nano-silver particles prepared by the existing nano-silver preparation methods.

The invention relates to the technical field of silver preparation, in particular to a 5nm silver preparation preparation device and method, the device comprises a base and a digital display control panel, an annular preparation pipeline structure is arranged on the base, and an annular flowing cavity used for achieving annular flowing of liquid is formed in the annular preparation pipeline structure; the annular preparation pipeline structure is provided with two or more liquid flow propelling assemblies used for propelling liquid to flow in the annular flow cavity in the circumferential direction of the annular preparation pipeline structure. Two feeding tank assemblies capable of metering and adding a reducing agent and a dispersing agent into the annular flowing chamber respectively are arranged on the annular preparation pipeline structure in the circumferential direction of the annular preparation pipeline structure; through mutual cooperation and cooperation among the annular preparation pipeline structure, the liquid flow propelling assembly, the feeding tank assembly, the spiral cooling assembly and the like, ordered flow mixing of liquid in the annular preparation pipeline structure can be achieved, and therefore full contact can be achieved when a reducing agent and a dispersing agent are added.