Copper mining used by stamp mill - 1 views

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  #1 betsy stone on 19 Jul 14

   

  The decyanide and having a hydroxyl ion concentration corresponding to (i. e. equivalent to) about pH 10.5 (Sorensons units), is contacted with a resinous polyamine anion exchanger in the free base condition,stamp mill a substantial and unforeseen sorption of the precious metal by the anion exchanger takes place, resulting in commercially complete removal of the precious metal from the solution. In general according to our process we maintain the hydroxyl ion concentration of the cyanide solution containing the dissolved precious metals at a pH value not in excess of about pH 10 to 11 and with upper and lower limits of about pH 8 to 11, the preferred range being from about pH 8.5 to 10.5. The ion exchanger in free base condition is contacted with this alkaline cyanide solution, and the alkalinity maintained during the period of sorption. When substantial amounts of dissolved silver are present which one desires to sorb, it is desirable to use the lower hydroxyl ion concentrations.
  
  We have further found that there is an important relation between the free hydroxyl ion content of the alkaline solution, and the emciency of sorption, and that beyond the pH range specified the efficiency of sorption decreases rapidly,copper ore beneficiation plant. Thus we have found that little or no sorption of dissolved gold and/or silver occurs from alkaline solutions having a pH range of from 13 to 14.
  
  We have further discovered that precious metals sorbed under the conditions specified above can be substantially completely and readily recovered from the anion exchanger by contacting the same with an alkali solution having an alkalinity somewhat above the working range previously specified, namely from pH 13 to pH 14. Desorption or recovery of the sorbed values from the ion exchanger in this manner leaves the exchanger in the desired free base condition for sorbin values from fresh solution. It is therefore a feature of our process that the polyamine anion exchanger remains as a free base in both sorption and desorption operations, and hence no extra regenerating steps or consumption of regenerants is employed.

   

  <div class="cArrow"> </div><div class="cContentInner">The decyanide and having a hydroxyl ion concentration corresponding to (i. e. equivalent to) about pH 10.5 (Sorensons units), is contacted with a resinous polyamine anion exchanger in the free base condition,<a href="http://www.lightcrusher.com/solutions/stamp-mill.html" rel="nofollow">stamp mill</a> a substantial and unforeseen sorption of the precious metal by the anion exchanger takes place, resulting in commercially complete removal of the precious metal from the solution. In general according to our process we maintain the hydroxyl ion concentration of the cyanide solution containing the dissolved precious metals at a pH value not in excess of about pH 10 to 11 and with upper and lower limits of about pH 8 to 11, the preferred range being from about pH 8.5 to 10.5. The ion exchanger in free base condition is contacted with this alkaline cyanide solution, and the alkalinity maintained during the period of sorption. When substantial amounts of dissolved silver are present which one desires to sorb, it is desirable to use the lower hydroxyl ion concentrations. <br /> <br /> We have further found that there is an important relation between the free hydroxyl ion content of the alkaline solution, and the emciency of sorption, and that beyond the pH range specified the efficiency of sorption decreases rapidly,<a href="http://www.lightcrusher.com/solutions/copper-ore-beneficiation-plant.html" rel="nofollow">copper ore beneficiation plant</a>. Thus we have found that little or no sorption of dissolved gold and/or silver occurs from alkaline solutions having a pH range of from 13 to 14. <br /> <br /> We have further discovered that precious metals sorbed under the conditions specified above can be substantially completely and readily recovered from the anion exchanger by contacting the same with an alkali solution having an alkalinity somewhat above the working range previously specified, namely from pH 13 to pH 14. Desorption or recovery of the sorbed values from the ion exchanger in this manner leaves the exchanger in the desired free base condition for sorbin values from fresh solution. It is therefore a feature of our process that the polyamine anion exchanger remains as a free base in both sorption and desorption operations, and hence no extra regenerating steps or consumption of regenerants is employed.</div>

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