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南非各种不同类型黄铁矿浮选厂的经验证明,冬季的几个月里,黄铁矿浮选品位和回收率会出现问题。当用乙基钠黄药(SEX)和巯基钠苯并噻唑(SMBT)在pH值分别为10和4条件下,处理两种不同类型黄铁矿的时候,由于外部温度的波动而引起的浮选矿浆温度的变化,明显地影响浮选工艺指标。黄铁矿的回收率只在一定程度上受到影响,但是脉石在精矿中的含量相当不同,特别足在浮选原矿中出现叶蜡石的时候。曾考查过温度下降时的影响,它会降低回收率,并且在某些实例中回收率的下降用改变选矿药剂用量的方法也不能加以补偿。在降低温度的情况下加大充气量或者提高叶轮转速,可以使浮选速度和回收率得到改善,但是提高充气量相应地会降低精矿品位。矿浆加温可以提高黄铁矿的回收率和精矿品位,但各黄铁矿浮选厂都必须进行详细的经济评价,因为温度的改变会引起浮选特性的较大变化,这取决于待浮矿石的类型以及所使用的捕收剂的种类。
The experience of various types of pyrite flotation plants in South Africa has shown that pyrite flotation grade and recovery problems can occur in the winter months. When two different types of pyrite were treated with ethyl sodium xanthate (SEX) and sodium thioglycolbenzothiazole (SMBT) at pH values of 10 and 4 respectively, floating due to external temperature fluctuations The change of slurry temperature obviously affects the flotation process index. The recovery of pyrite is only affected to some extent, but the content of gangue in the concentrate is quite different, especially when pyrophyllite appears in the flotation ore. The effect of a temperature drop has been examined, which reduces the recovery rate and in some cases the drop in recovery can not be compensated by changing the amount of dressing agent. Increasing the air charge or increasing the impeller speed at lower temperatures will result in improved flotation speed and recovery, but increasing the air charge will, in turn, reduce the concentrate grade. Pulp warming can increase pyrite recovery and concentrate grade, but each pyrite flotation plant must undergo a detailed economic evaluation because changes in temperature can cause large changes in flotation characteristics, depending on the The type of floating ore and the type of collector used.