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| RECOVERY AND SEPARATION OF As AND Zn FROM THE LEACHING SOLUTION OF WHITE ASH |
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Received:July 15, 2006
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| DOI： |
| KeyWord:white ash; asenic; zinc ; separation |
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| Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 102201, China |
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| Abstract: |
| Zn and As in leaching solution of white ash from copper smelting process are co-precipitated and formed sulfide by sulfuration precipitation method. Under the optimal experimental conditions,100% of Zn and 99% of As are co-precipitated.By adjusting pH of leaching solution with NaOH and adding Fe2(SO)4, the precipitation of ferric arsenate is formed,and over 90 % of As is removed.Finally,Zn is completely precipitated by adding sulfide.By adjusting pH to 1 with Ca(OH)2 to substitute NaOH,over 95% of As is separated,and then adding Na2S,Zn is precipitated when mole ratio of Na2S/Zn is 1.5 and pH of the solution is 4.Arsenic is not detected in the filtrate obtained finally,which illustrates that arsenic is completely precipitated. |
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