normal style="MARGIN: 0cm 0cm 0pt; tab-stops: 106.95pt 144.0pt"> 为使含金砷黄铁矿精矿中的细粒浸染金解离,以便下一步氰化,最近几年提出了许多新的湿法冶金法。从环保观点看,采用这些方法是合理的,但除工艺效果外,这些方法还存在许多严重的缺点。用行星齿轮磨矿机和喷射磨矿机进行机械破碎是这方面有前途的工艺方案之一。在超细磨时,提高含金硫化矿物的解离能力,可以在条件不大严格,药剂耗量适度和设备外形简单的情况下,实现金矿物的分解。
normal style="MARGIN: 0cm 0cm 0pt; tab-stops: 106.95pt 144.0pt"> 本试验所用的原料为雅库梯亚的精矿之一,精矿细磨进而用湿法冶金处理。用含
normal style="MARGIN: 0cm 0cm 0pt; tab-stops: 106.95pt 144.0pt"> 用MCII-05和MCII-005型的磨矿机进行喷射磨矿。利用压缩空气作为能载体,表压为0.45~0.50MIIa、耗量
normal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt; tab-stops: 106.95pt 144.0pt">分级机转子的转动速度从20增加到
normal style="MARGIN: 0cm 0cm 0pt; tab-stops: 106.95pt 144.0pt"> 上述粒级范围内精矿中的硫化矿物特点是化学活性高(与 原矿物相比高9~15倍),在常温和常压下,能用氢氧化钠溶液进行分解。在此条件下,砷主要以砷酸盐离子的形式转入溶液,而硫-以硫代硫酸盐和硫酸盐离子的形式进入溶液。在最佳条件下,砷黄铁矿分解80~85%,黄铁矿-40~45%。
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normal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt; tab-stops: 106.95pt 144.0pt">机械破碎后,增加了粉碎矿物复合体的吸附能力。
normal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt; tab-stops: 106.95pt 144.0pt">为了抑制Au和As的二次吸附,必须用AM-26型的阴离子交换剂(8.05%)进行吸附浸出。氰化时贵金属的回收率取决于预先加碱处理时间(τ))。如果将此时间由12d,时增加到48小时,
normal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.75pt; tab-stops: 106.95pt 144.0pt">而在其他条件也理想的情况下:液:固=6:1,氧氧化钠浓度为
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>用不同方法处理精矿时金和银的回收率
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 11pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-rule: exactly" align=center>处 理 方 法 | normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 11pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-rule: exactly" align=center>剩余含量克/吨 | normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 11pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-rule: exactly" align=center>回收率% | ||
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 11pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-rule: exactly" align=center>Au | normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 11pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-rule: exactly" align=center>Ag | normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 11pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-rule: exactly" align=center>Au | normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 11pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-rule: exactly" align=center>Ag | |
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 11pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-rule: exactly" align=center>喷射磨矿精矿的吸附氰化法喷射磨矿精矿碱浸吸附氰化法 | normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 11pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-rule: exactly" align=center>12.50 | normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 11pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-rule: exactly" align=center>76.00 | normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 11pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-rule: exactly" align=center>77.30 | normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 11pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-rule: exactly" align=center>91.30 |
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 11pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-rule: exactly" align=center>-6微米粒级,90% | normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 11pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-rule: exactly" align=center>6.10 | normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 11pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-rule: exactly" align=center>10.00 | normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 11pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-rule: exactly" align=center>88.90 | normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 11pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-rule: exactly" align=center>96.20 |
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 11pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-rule: exactly" align=center>-15微米粒级,90% | normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 11pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-rule: exactly" align=center>5.80 | normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 11pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-rule: exactly" align=center>8.00 | normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 11pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-rule: exactly" align=center>89.50 | normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 11pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-rule: exactly" align=center>97.00 |
normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 11pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-rule: exactly" align=center>给矿粒度70%-74微米 | normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 11pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-rule: exactly" align=center>17.60 | normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 11pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-rule: exactly" align=center>100.00 | normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 11pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-rule: exactly" align=center>68.00 | normal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 11pt; TEXT-ALIGN: center; tab-stops: 106.95pt 144.0pt; mso-line-height-rule: exactly" align=center>62.50 |
normal style="MARGIN: 0cm 0cm 0pt; tab-stops: 106.95pt 144.0pt"> 从表中可以看出,精矿吸附氰化的指标取决于预先的碱处理方案。当把喷流工序和用氢氧化钠溶液(按表1)浸出结合起来时,可保证贵金属的最高回收率。此时金的回收率达88.9%,银96.2%。喷流磨矿精矿的吸附氰化,在没有预先碱浸时,Au回收率不超过77.3%,As 71.3%,浸出渣中的含量分别为12.15和