normal style="MARGIN: 0cm 0cm 0pt; tab-stops: 106.95pt 144.0pt"> 用炭吸附法处理氰化贵液:
normal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt; tab-stops: 106.95pt 144.0pt">用
normal style="MARGIN: 6pt 0cm; TEXT-INDENT: 21.85pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-para-margin-top: .5gd; mso-para-margin-right: 0cm; mso-para-margin-bottom: .5gd; mso-para-margin-left: 0cm" align=center>
normal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt; tab-stops: 106.95pt 144.0pt">(实际上冶金学者采用“污染”这种表达法就是指明:氰化浸出液被那些干扰氰化或锌粉置换的其他组分污染了)。
normal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt; tab-stops: 106.95pt 144.0pt">其他研究人员曾彻底地研究了有害物质对于氰化的影响,如硫化物离子就严重地干扰了锌粉置换法的回收。浓度为百万分之几的硫化物离子可明显地阻碍金置换,当硫化物为14.4ppm时,金的沉淀全部停止了。还没有确定出由硫化物离子所造成的不利结果的机理,但确信其原因是硫化锌包裹了锌金属。
normal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt; tab-stops: 106.95pt 144.0pt">研究用活性炭从贵液中回收金银,因为炭具有在污染的氰化液中不会受到损害的功能。往含金银溶液中加入金的示踪剂(Au195)以测定吸附程度。这种带有“示踪”的贵液被泵送五个串联着的吸附柱,吸附柱直径1英时、高4英时,每个柱装有
normal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt; tab-stops: 106.95pt 144.0pt" align=center>
normal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt; tab-stops: 106.95pt 144.0pt">
normal style="MARGIN: 6pt 0cm; TEXT-INDENT: 21.85pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-para-margin-top: .5gd; mso-para-margin-right: 0cm; mso-para-margin-bottom: .5gd; mso-para-margin-left: 0cm" align=center>表5 活性炭附金银的结果
normal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-alt: 0pt" align=center>炭荷载吸附金银的结果 | ||
normal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-alt: 0pt" align=center>吸附柱 | normal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-alt: 0pt" align=center>金 | normal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-alt: 0pt" align=center>银 |
normal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-alt: 0pt" align=center>1 | normal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-alt: 0pt" align=center>2556 | normal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-alt: 0pt" align=center>502 |
normal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-alt: 0pt" align=center>2 | normal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-alt: 0pt" align=center>1648 | normal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-alt: 0pt" align=center>529 |
normal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-alt: 0pt" align=center>3 | normal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-alt: 0pt" align=center>841 | normal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-alt: 0pt" align=center>517 |
normal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-alt: 0pt" align=center>4 | normal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-alt: 0pt" align=center>96 | normal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-alt: 0pt" align=center>388 |
normal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-alt: 0pt" align=center>5 | normal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-alt: 0pt" align=center>6 | normal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-alt: 0pt" align=center>278 |
normal style="MARGIN: 0cm 0cm 0pt; tab-stops: 106.95pt 144.0pt"> 初步研究表明粒状活性炭能有效地从被硫化物离子污染的贵液中吸附金氰络合物。第一个炭柱中的荷载为2556盎司/吨,这比在一般堆浸生产中获得的200~800盎司高得多。其原因可能是因为给入溶液的含金量比用常规法处理矿石所获得的贵液高30~100倍。整个试验获得的贫液含金量不到0.1ppm,银也被吸附,但不象金那样有效。炭的载银量为500盎司/吨。在吸附试验开始时,银没有明显的突破。但当处理了
normal style="MARGIN: 6pt 0cm; tab-stops: 106.95pt 144.0pt; mso-para-margin-top: .5gd; mso-para-margin-right: 0cm; mso-para-margin-bottom: .5gd; mso-para-margin-left: 0cm"> 结语:
normal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt; tab-stops: 106.95pt 144.0pt">用常规氰化-炭吸附法处理砷黄铁矿精矿可回收精矿中金97%、银91%、在处理这种物料过程中采用搅拌氰化和渗滤氰化都可以。但是在渗滤法中必须加入空气以提供足够的氧保证金有效地溶解。利用炭吸附法从污染的贵液中回收金银是很成功的。可获得每吨炭共载金