36 results about "SILVER NITRATE CRYSTALS" patented technology

The invention discloses a method for synthesizing flower-shaped silver micro-particles. The method comprises the following steps of respectively measuring ascorbic acid solid powder and silver nitrate crystal, and respectively dissolving the ascorbic acid solid powder and the silver nitrate crystal into deionized water for standby use; placing the prepared ascorbic acid solution into the silver nitrate solution, and ensuring the mol ratio of the ascorbic acid and the silver nitrate to be (0.8-1.2):1; immediately adding a cleaned stainless steel sheet into the mixed solution; magnetically stirring the reaction materials for 180min to 360min after the stainless steel sheet is added, and ending the reaction; taking out and centrifugally separating the stainless steel sheet in the material after the reaction is ended, and precipitating and washing the stainless steel sheet to obtain the flower-shaped silver micro-particles. By adopting the method, the shape of a product is controllable, simplicity in operation can be realized, the condition is moderate, and the repeatability is good.

The invention discloses a preparation method of a cellulose acetate electrostatic spinning solution. The preparation method comprises the following steps of taking 6-9 parts of acetone by mass, 1-3 parts of dimethylacetamide by mass and 0.5-2 parts of water by mass as raw materials to prepare solvent after mixing; adding cellulose acetate particles and silver nitrate crystals into the solvent, slowly heating to 60-80 DEG C at the heating speed of increasing by 2-5 DEG C at every minute and stirring for 60-120 minutes to fully dissolve the cellulose acetate particles so as to obtain a composite cellulose acetate solution containing 1 wt%-3wt% of silver nitrate; after the composite cellulose acetate solution is cooled, adding ammonium bicarbonate which is 1 wt%-3wt% of the mass of the composite cellulose acetate solution, placing in water bath at 40 DEG C, and mechanically stirring to carry out expansion treatment so as to obtain the cellulose acetate electrostatic spinning solution. According to the preparation method, nano-cellulose with an anti-bacterial function is stably prepared by the electrostatic spinning solution through determining the optimum contents of water and silver nitrate in the electrostatic spinning solution, and the preparation method has the advantages of simplicity in operation and low cost.

The invention belongs to the field of metal smelting, and specifically relates to a method for separating silver and copper in silver electrolysis waste liquid. First, the silver electrolysis waste liquid is concentrated and crystallized, filtered, and then copper powder is added to the obtained filtrate for replacement, and the filtrate obtained after filtering again is It is the waste liquid after silver recovery. Using the above scheme, first concentrate the silver electrolysis waste liquid, because the solubility of silver nitrate is relatively small, and because of the high ion content in the waste liquid, silver nitrate crystallizes out after concentration, and silver nitrate crystals are obtained by filtration; then use silver and copper According to the difference in the activity of the two metals, copper powder is used to replace the silver slag, thereby realizing the recovery of silver, that is, the separation of silver and copper. The scheme of the present invention is simple and efficient, and the silver recovery rate can be as high as over 99%.

The invention discloses a method for preparing and separating silver nanowires under normal pressure on a large scale. First make a solution of the crystal form control agent, then take the solution of the crystal form control agent, polyvinylpyrrolidone, and polyol into the reactor, stir and heat up to obtain the first mixture, in which silver nitrate crystals are used as a reference, and the crystal form in the reactor is The mass ratio of control machine, polyvinylpyrrolidone and polyol is (5×10 ‑4 -2×10 ‑3 ): (0.7‑1.4): (50‑100); disperse silver nitrate crystals to obtain silver nitrate / polyol solution, add it to the first mixture three times, keep warm and cool to room temperature to obtain the second mixture, then add the second mixture 3-6 times the volume of absolute ethanol, after being stirred, transferred to the settling tank, by setting the height of the settling tank, adopting the method of "cutting the head and removing the tail" to stand and separate, the material of the settling tank is not the same as the silver nanowire Compatible. The preparation method of the invention is simple, the obtained silver nano wire has good dispersibility and wide application range.