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src="6.files/dot1.gif" width=8 border=0>再生资源简述</A></DIV></TD> <TR> <TD><DIV align=left><IMG height=16 src="6.files/dot1.gif" width=8 border=0><A href="ah.htm">再生资源可持续发展战略的由来</A></DIV></TD> <TR> <TD></TD> </TR> </TBODY> </TABLE></TD> </TR> </TBODY> </TABLE></TD> </TR> </TBODY> </TABLE></TD> <TR> <TD><IMG height=34 src="6.files/zuopinfenlei.jpg" width=173 border=0></TD> </TR> </TBODY> </TABLE></TD> <TR> <TD><DIV align=center> <TABLE cellSpacing=1 cellPadding=1 width="100%" border=0> <TBODY> <TR> <TD width="47%"><A href="http://www.baidu.com/"><IMG height=31 src="6.files/slogo.gif" width=78 border=0></A> <TD width="53%"><A href="http://www.google.com/"><IMG height=40 src="6.files/google_sm.gif" width=89 border=0></A></TD> <TR> <TD height=36><A href="http://www.zyhsw.com/yahoo.com.cn"><IMG height=24 src="6.files/yhologo3.gif" width=79 border=0></A> <TD height=36><A href="http://www.163.com/"><IMG height=33 src="6.files/so_logo.gif" width=88 border=0></A></TD> <TR> <TD height=37><A href="http://www.sina.com.cn/"><IMG height=32 src="6.files/sina_logo2.gif" width=78 border=0></A> <TD height=37><A href="http://www.sohu.com/"><IMG height=37 src="6.files/logo1.gif" width=85 border=0></A></TD> <TR> <TD colSpan=2 height=24><DIV align=center> <SCRIPT src=""></SCRIPT> </DIV></TD> </TR> </TBODY> </TABLE> </DIV></TD> </TR> </TBODY> </TABLE> <TD style="BORDER-LEFT: #cecfce 1px solid" vAlign=top width=720 bgColor=#ffffff colSpan=8 height=67><TABLE height=59 cellSpacing=0 cellPadding=0 width=680 border=0> <TBODY> <TR> <TD vAlign=top width=680 height=59><TABLE height=59 cellSpacing=0 cellPadding=0 width="100%" border=0> <TBODY> <TR> <TD height=59><P align=center><B><FONT color=#336699 size=5>有色金属分类</FONT></B> </P></TD> </TR> </TBODY> </TABLE></TD> </TR> </TBODY> </TABLE></TD> <TR> <TD style="BORDER-LEFT: #cecfce 1px solid" vAlign=top width=720 bgColor=#ffffff colSpan=8 height=16>有色金属的分类<BR> <BR> 有色金属的分类很多，大约有80多种，大致按其比重、价格、在地壳中的储量及分布情况和被人们发现与使用情况的早晚等分为五大类。<BR></TD> <TR> <TD style="BORDER-LEFT: #cecfce 1px solid" vAlign=top width=720 bgColor=#ffffff colSpan=8 height=567><p><FONT color=#000080><BR> </FONT>（1）重有色金属；指比重大于4.5的有色金属。包括铜，镍，锢，铅，锌，锑，汞，镉和铋。<BR> <BR> （2）轻有色金属；指比重小于4.5的有色金属。包括铝，镁，钙、钾、锶和钡。<BR> <BR> （3）贵金属；指在地壳中含量少，开采和提取都比较困难，对氧和其它试剂稳定，价格比一般金属贵的有色金属。包括金、银。和铂族元素。一般比重都较大，熔点较高在916－3000度，有很好的化学稳定性、优良的抗氧化性及耐腐蚀性。<BR> <BR> （4）半金属；一般指硅、硒、碲、砷和硼五种元素。其物理化学性质介于金属和非金属之间。如砷是非金属，但它能传热和导电。<BR> <BR> （5）稀有金属；稀有金属并不是说稀少，只是指在地壳中分布不广，开采冶炼较难，在工业应用较晚，故称为稀有金属。稀有金属又包括为稀有轻金属，稀有高熔点金属，稀有分散金属，稀土金属，稀有放射性金属。 </p> <p> </p> <p> </p> <p> </p> <p> </p> <p> </p> <p> </p> <p> </p> <p> </p> <p> </p> <p>广东回收公司,广州废金属回收公司,广州厂房拆迁回收公司,广东机械楼拆迁回收公司,广东回收公司,广州市回收公司,广东省回收公司,广州中怡回收公司,广东省珠江三角洲（佛山、江门、肇庆、清远、珠海、顺德、中山、南海、东莞、深圳、江门、番禺、花都、增城、从化、韶关、惠州、三水、惠州、河源等! </p></TD> <TR> <TD style="BORDER-LEFT: #cecfce 1px solid" vAlign=top width=4 bgColor=#ffffff height=26> <TD style="BORDER-LEFT: #cecfce 1px solid" vAlign=top width=117 bgColor=#ffffff height=26> <TD style="BORDER-LEFT: #cecfce 1px solid" vAlign=top 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