<h2 class="newsinfo_title">金属冶炼中镉回收</h2>
	 <p class="divH10"></p>
	 <div class="divH20">
		<ul class="newsinfo_tips fl">
		  <li>2012-3-19 11:45:47</li>    
		  <li>来源：网络</li>    
		  <li>作者：</li>
		</ul>
		<!--ul class="newsinfo_tips fr">
		  <li>字号：</li>
		  <li><span class="pt5"><img src="/ContentImage/ReleFiles/2011/20111213/images/btn_05.jpg" /></span></li>
		  <li><span class="pt5"><img src="/ContentImage/ReleFiles/2011/20111213/images/btn_06.jpg" /></span></li>
		</ul-->
	 </div>
	 <div class="divH10"></div>
	 <div class="divH25">
	 <ul class="newsinfo_tips02 fl cGray01">
		<li><span class="newsinfo_ico"><img src="/ContentImage/ReleFiles/2011/20111213/images/ico_01.gif" /></span><a href="#">投稿</a></li> 
		<li><span class="newsinfo_ico"><img src="/ContentImage/ReleFiles/2011/20111213/images/ico_02.gif" /></span><a href="#">打印</a></li> 
		<li><span class="newsinfo_ico"><img src="/ContentImage/ReleFiles/2011/20111213/images/ico_03.gif" /></span><a href="#">收藏</a></li>
	<!-- Baidu Button BEGIN -->
	<div id="bdshare" class="bdshare_t bds_tools get-codes-bdshare">
		<span class="bds_more">分享到：</span>
		<a class="bds_qzone"></a>
		<a class="bds_tsina"></a>
		<a class="bds_tqq"></a>
		<a class="bds_renren"></a>
	</div>
	<script type="text/javascript" id="bdshare_js" data="type=tools&amp;uid=684790" ></script>
	<script type="text/javascript" id="bdshell_js"></script>
	<script type="text/javascript">
		document.getElementById("bdshell_js").src = "http://bdimg.share.baidu.com/static/js/shell_v2.js?cdnversion=" + new Date().getHours();
	</script>
	<!-- Baidu Button END -->
	</ul>
 </div>
 <div class="divH20"></div>
 <div class="newsinfo_introduceBox">
	<table cellpadding="0" cellspacing="0" class="newsinfo_introduce">
		 <tr>
		   <td>
			   <table cellpadding="0" cellspacing="0" class="newsinfo_introduce_tab">                     
				  <tr>
					  <td width="25" align="center"><img src="/ContentImage/ReleFiles/2011/20111213/images/ico_09.gif" /></td>
					  <td width="60"><b>导读：</b></td>
					  <td>在湿法炼锌的净化过程中，通过锌粉的置换沉淀而将镉分离出来，以此为原料回收镉。火法冶炼中的大部分搞在焙烧时挥发进入灰尘中，此亦为回收镉的原料......</td>
				  </tr>
				  <tr>
					  <td width="25" align="center"><img src="/ContentImage/ReleFiles/2011/20111213/images/ico_11.gif" /></td>
					  <td width="60"><b>关键字：</b></td>
					  <td>金属 冶炼 镉</td>
				  </tr>
			   </table>
		   </td>
		 </tr>
	</table>  
 </div>
<div class="divH20"></div>
<div class="over_x"><p>在湿法炼锌的净化过程中，通过锌粉的置换沉淀而将镉分离出来，以此为原料回收镉。火法冶炼中的大部分搞在焙烧时挥发进入灰尘中，此亦为回收镉的原料。<br />
　　置换沉淀的镉含20-40%Zn,10-30%Cd,1-20%Cu,首先用锌电解尾液溶解，然后用锌粉里换沉淀铜,过滤后用锌粉沉淀镉。这种镉为海绵镉，用镉电解尾液溶解，用KMnO4、Ca(OH)2、锌粉净化后，用含镐50-80kg/m&rsquo;，锌30-70kg/m3,游离硫酸110-140kg/m3的电解液进行电解提取。<br />
　　最近，由于净化技术的进步.可以得到高纯度的镐的沉淀物，沉淀物用锌电解尾液溶解后，用KMnO4。中和沉淀除去铅、铊而后向滤液中浸入锌板，置换析出镉。该海绵福纯度高，脱水、成型，加NaOH溶镉，除锌后铸锭市售。此法比电解提取法工序简便，尤其可得纯度达99.99%的镉。烧结时灰尘中的镉用H2SO4浸出，用锌板从浸出液中置换出镉，所得海绵镉经脱水，成型后熔做，用蒸馏精炼法制得纯镉。</p>
<p>&nbsp;</p>
</div>
	<div class="divH20"></div>
	<div class="pT25 t-r f14 cGray01">（责任编辑：00955）</div>
	<div class="divH20"></div>