Abstract: The gold grade of a low grade gold mine is 0.65 g/t,and the leaching rate of drip heap is low.In order to investigate the effect of magnetization treatment on the drip heap leaching effect of the gold ore,the magnetization treatment condition test was carried out to investigate the effect of Ca2+,Mg2+ and Na+ concentration on the surface tension before and after the solution magnetization,and explore the effect and mechanism of magnetization solution on the drip heap leaching effect of lowgrade gold ore.The results showed that:① Magnetization can reduce the surface tension of deionized water.When the magnetic induction intensity is 1 T,the suitable magnetization conditions are magnetization time of 15 min and water flow speed of 300 r/min.Under these conditions,the magnetization effect of deionized water can only be maintained for 50 min.② Ca2+ and Mg2+ in solution can increase the surface tension of solution to varying degrees,and the surface tension increases with the increase of ion concentration.Magnetization can reduce or eliminate the influence of such ions to a certain extent.Although the presence of Na+ also reduced the surface tension of the solution,the surface tension of the solution was less affected by the concentration of Na+.③ After magnetization,the contact angle between the sodium cyanide leaching solution and the ore is smaller,and the magnetization is conducive to the spread of the sodium cyanide leaching solution on the surface of the ore.④ Magnetization treatment of gold leaching solution is beneficial to improve the gold leaching rate of ore,and the gold leaching rate increases from 58.04% to 62.21%,with an increase of 4.17 percentage points.

Key words: low grade gold ores, magnetization treatment, surface tension, iron concentration, drip and head leaching, leaching rate