Preparation And Application Of Ag-Ti Bimetallic Cathode Materials For Gold Hydrometallurgy

Electrode plays an extremely important role in the process of gold electrolysis.The corrosion resistance and electronic conductivity are related to the gold productivity,energy consumption and production safety and environmental protection.In this paper,Ag-Ti bimetal was prepared by hot pressed diffusion and Infiltration sintering.Sterling silver has the best electrical conductivity and pure titanium has a good corrosion resistance.Processing them become silvering bimetallic layered composite material.It can be used to solve the problem of electrolytic cathode heating with good conductivity of pure silver,and effectively reduce the power consurrption in electrolysis process.The properties and mechanism of the interfacial diffusion layer were analyzed by means of metallographic microscope(OM),scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS).It also study that effect of different cathode materials and different tenperature on the electrolytic efficiency by using AAS,analytical balance,hydro metallurgy electrolytic cell and its matched numerical control switch type dc voltage stabilizing por.By studying the influence of different cathode materials and different tenperature on electrolytic efficiency,we can conclude the best cathode material and the suitable electrolyte temperature for gold electrolysis.The preliminary industrial application of Ag-Ti bimetal cathode materials in the field of gold electrolysis was realized.We draw the following conclusions:(1)A solid solution phase ?-Ti and a layer of mesophase AgTi are presented in the diffusion layer obtained by the method of hot pressed diffusion and infiltration sintering.(2)When the thermal pressure diffuses the Ag-Ti bimetallic,as the thermal pressure decreases,the energy decreases in the diffusion process,the diffusion rate slows down,the thickness of the silver plate and the titanium plate is reduced;Diffusion zone,hardness is gradually increased,and reach the maximum value at 890 ?.(3)When the infiltration diffusion preparation of Ag-Ti bimetallic material,under the infiltration temperature of 950 ?,the interface has the highest hardness value.With the increase of the melting temperature,the stability and thickness of the diffusion layer of the Ag-Ti bimetallic interface are decreasing,and the hardness of the interface is gradually reduced.In the process of cooling solidification of liquid silver,the expansion coefficient of different phases will be different,so that their line shrinkage is also different,in the case of tensile stress,a large number of exfoliated AgTi phases appear on one side of the silver,and holes are generated in the two phases of less bonding force.(4)With the increase of the thickness ratio of silver and titanium,the resistance decreases,the electrolytic voltage is reduced and the gold productivity increases.When the silver and titanium thickness ratio reached 8:1,it could save a third of the electricity.(5)Using Ag-Ti bimetallic cathode materials for electrolysis and the productivity of gold was up to 79%,higher than the gold electrolytic average.In the electrolytic experiment condition,the electrolyte temperature 40? is the ideal electrolysis temperature.