Industrial Experimental Study on Recovery of Tellurium from Tellurium Slag
Tellurium,as a kind of multi-purpose scattered metal,has a wide application prospect.It will have great economic benefits if it can be recovered efficiently.In the present study,the process of"alkaline leaching,purification and neutralization of tellurium"was used to recover tellurium efficiently from tellurium slag produced by silver separating furnace.In the alkaline leaching process,the effects of alkaline concentration,temperature,and leaching time were investigated,and the optimized leaching conditions were established:30g/L of NaOH concentration,70℃of temperature,2h of leaching time.Under these conditions,the leaching rate of Te reached 84.94%while the leaching rate of Pb was about 58.60%.After a purification process,the concentration of lead in the purified solution was reduced to 25 mg/L.Finally,TeO2 was obtained from the purified solution by the precipitation process under the conditions:final pH of 5.5,75℃of temperature,and 2h of time.The precipitation rate of Te was as high as 99.08%.Therefore,the comprehensive recovery rate of tellurium from tellurium slag was 84.16%,which proved that this process is a simple and efficient tellurium recovery process.
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