Removal Effect of Inorganic Acid on Multiple Heavy Metals from Gold Tailings
Han Yanshan
Lu Xinwei
Wu Xing
Abstract：The oscillated test was conducted to study the removal effect of different concentrations, liquid -solid ratios,leaching time and leaching number of nitric acid and hydrochloric acid respectively on heavy metals in the gold tailings.Then the contents of total heavy metals and their speciation were analyzed. The results showed that the optimal leaching conditions were nitric acid of 1 mol /L and hydrochloric acid of 2 mol /L,liquid -solid ratio of 1 5∶1 ,leaching 6 h and 1 time.Under these conditions,the removal rate of ni-tric acid to Cu,As,Ni,Sr,Co and Pb were 39.80%,27.77%,24.57%,65.80%,1 7.1 7% and 26.87%respectively,and the removal rates of hydrochloric acid to the above elements were 43.29%,42.23%, 28.57%,56.67%,1 8.48% and 31 .54% respectively.The results of total heavy metals and their speciation analysis showed that the contents of As,Sr and Ni in gold tailings were higher with the concentrations of 1 930.25,31 5.25 and 40.90 mg/kg;the removal effects of nitric acid and hydrochloric acid on heavy metals with the forms of high locomotivity and bio -availability were higher,but that on residual form of heavy metals was not obvious.
Keywords：Inorganic acidHeavy metalGold tailingsRemoval effectFormLeaching
Publication Date：2015-01-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：6( 54-59 )