Conductive silver paste recovery and classification

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Silver texture is white, glistening, can produce jewelry. Silver market demand is high, and it is also non-renewable resources, so silver recovery becomes very important.

Recovery of silver nitrate can be extracted from high purity silver, can be used to make silver jewelry. The filtered purified conductive silver paste can be used for coldness tablets, touch screen and so on, single component, with excellent printing properties, output and electrical conductivity function, thin lines with high-resolution, print lines clear, the recovery silver electrode are with high hardness, good wear resistance, low curing temperature, curing time is short, function unchanged. Silver recovery, to put it bluntly is recovered substance with a high silver content, through a series of processing, registration, extraction process to convert it into silver paste. With silver usage throughout, silver recovery must be having a very good market.

Silver conductive paste divided into two categories: a. polymeric silver conductive paste (dried or cured into film, an organic polymer as a binder phase); b. sintered type silver conductive paste (sintered into film, the sintering temperature > 500, glass powder or oxide is used as binder phase).

Silver classification according to particle size, uniform particle size less than 0.1¼m (100nm) is the nano-silver; 0.1¼m metal powder, as for the silver, it can choose physical method (plasma, atomization method), chemical method (silver nitrate thermal decomposition, liquid recovery). Because silver is a precious metal, easily to be recovered and returned to elemental state, thus the liquid recovery method is currently the most important way to prepare silver. Can be dissolved silver (silver nitrate) in water, participate in chemical reducing agents (such as hydrazine, etc.) reaction, to accumulate silver powder, by washing and drying to obtain silver recovery powder, uniform particle size is between 0.1-10.0¼m, recovery agent selection, reaction conditions manipulation, the use of the surfactant, can be prepared different physical-chemical properties silver powder (particle shape, degree of slack, uniform particle size distribution, specific surface area, bulk density, tap density, grain size, crystallinity, etc.), machining recovery powder (milling, etc.) can be obtained polished silver powder, silver flake.

According to silver powder applied in the silver conductor paste. Now divided the electronic industry silver powder into seven categories: a. high sintering activity silver powder of high temperature sintering conductive silver paste, b. high morale silver powder of temperature sintering silver conductive paste, c. highly conductive recovery silver powder, d. polished silver powder, e. silver flake, f. nano silver powder, g. thick silver powder. Of which a, b, c was collectively referred to as silver powder (or recovery powder), f class silver powder used in silver conductor paste is in the explore process, g class coarse silver powder is mainly used for silver alloy and other electrical aspects.

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