Study On Influence Of Residual Ions On Recovery Anglesite From Zinc Leaching Residues In A Smelter And Elimination Methods

There are about 3000 t zinc leaching residue a year in the smelter in Guang dong,and it's lead content is about 18%.When using a beneficiation methods to recover anglesite,it is founded that zinc leaching residue contains a lot of impurity ions.This result in the complex solution system,and seriously affects the ore dressing indexes.By studying anglesite pure minerals,this paper systematically investigated the kinds and concentrations of ions.The conclusions are as follows:When the concentration of Ca²⁺ and Mg²⁺ reached 0.1 mol/L,it changed the trend of anglesite flotation behavior change with pH.When the p H is 6,their highest recovery respectively are 77.7% and 75.4%.The addition of Fe²⁺ have changed the trend of anglesite flotation behavior.The anglesite flotation recovery is largest in pH=6.With the increase of concentration of Fe²⁺,anglesite recovery is also declining.When the concentration of Fe²⁺ is 0.1mol/L,the highest recovery is 20.7%.The addition of Pb²⁺ and Zn²⁺ do not changed the trend of anglesite flotation behavior change with pH.When the concentration is 0.1mol/L,their highest recovery respectively are 70.1%? 46.6%.When it's concentration is only 5×10-4 mol/L,Fe³⁺ almost completely inhibit the flotation of anglesite.By the solution chemical calculation,when metal ions have strong inhibition on anglesite flotation,the p H value is the same of the pH value at metal ions begin to generate hydroxy complexes.In combination with zeta potential test and adsorbance test,it is founded that the hydroxy complexes compete with CSY to adsorb on the surface of anglesite.This is the main way which has much effects on anglesite flotation.Because of iron ions react with CSY,further constitutes the serious influence of anglesite flotation.When liquid-solid ratio is 2ml/g,the two stage washing filtering method can effectively clear up foreign ions,the concentration of Fe³⁺?Fe²⁺?Pb²⁺? Zn²⁺ drop to below harmful concentration.The anglesite flotation effect improve greatly,at the same time,reduce the water consumption.