Hi Millza79 - unless you have a specific problem you should not need lead nitrate for a conventional leach circuit. 

If you require to get your DO levels up then the most economical way is with liquid oxygen.

Cheers

Hi, Millza 79,

if you have higher sulphides in the ore you need to add PBO and H2O2 , PbO is added in the ball mill , Hydrogen peroxide in the leaching circuit, we are adding around 400 g/t in aeration agitator before adding Lixiviant.

First, you must clear the doubt without your mineral requires or not the contribution of peroxide, as well as lead nitrate. The first for the catalysis and efficiency of the leaching reaction and the second, either for the same purpose, or for the formation of the lead-zinc pair in the cementing reaction. That is, there are different functions and points of addition of one or another compound and therefore until you define its use and consumption level, it can not be specified that it is in the mill, in the leaching or precipitation head . If a mineral requires them, it can only and must come from specific laboratory tests where once the milling conditions, cyanide and alkali concentration have been defined, in addition to the treatment time, the influence of said substances is determined and if the process requires or not of them, as well as in what point of addition must be made, since a cost should not be added to the operation if it is not necessary, unless it is already evaluated in terms of cost-benefit that it is necessary to use them. Therefore the need and consumption is derived from tests where even a variance analysis method is used, to determine if there is inlfuence or not of each substance in the extraction of values, since the cost of other substances must be justified and have a positive impact in the extraction of values ​​in each mineral and process in particular.

Pb(NO3)2 is added to the Ball mill for soluble sulfide removal as Shastry commented...attempt no more than 2-lb/st for starters...Pb(NO3)2 + S2- = PbS + 2NO3- increasing reagent amounts based on efficacy; Sulfides are O2 scavengers & will also tie up CN as SCN-...H2O2 is expensive & hopefully you will not have to resort to the same if Pb works; intensive aeration in your CIL's should be attempted before using other means of O2 transfer.