某高钾钠铁精矿浮选降杂试验

对某含高钾、钠(0.8%)铁精矿进行了反浮选降杂试验,采用SD抑制剂、AY-17阳离子型捕收剂,得到了TFe70.24%的高品位优质铁精矿,有害杂质钾、钠的含量低于0.2%。

高钾钠磷石膏制备纸面石膏板的新技术研究

通过分析高钾钠含量磷石膏粉制纸面石膏板时的不粘纸问题,提出了利用廉价无机聚合物与湿法磷酸生产废水作为组合添加剂的解决方案,并对料浆标准稠度、凝结时间、磷石膏粉强度,磷石膏板粘纸性能等工艺参数进行了考察。聚合硫酸铁与氟硅酸废水的添加量分别为石膏粉量的1%与3%时,可以有效解决因钾钠离子迁移而产生的"泛霜"现象,产品合格率接近100%。

安徽某选厂高钾钠铁精矿磁选降杂试验

为了将安徽某高钾钠铁精矿中的钾、钠降到0.3%以下,针对该铁精矿中钾、钠主要以钠长石、钾长石、黑云母形式存在,碱金属多与铁矿物连生的特点,通过再磨及不同磨矿方式、不同磁选设备等手段,采用磁选方法脱除了原铁精矿中的钾、钠,使铁精矿铁品位达到68.60%,有害杂质钾、钠含量降至0.193%。

Promotion effect of KOH on preparation of dissolved Fe(Ⅵ)

In order to improve the yield and stability of ferrate in solution, dissolved Fe(Ⅵ) prepared with NaOH and KOH respectively was compared in this study. The results showed that KOH is more suitable than NaOH for the preparation of dissolved Fe(Ⅵ) at temperature over 50 ℃. It is found that the dissolved Fe(Ⅵ) prepared with KOH increases quickly at first, and then slowly with the increasing concentrations of OH-and ClO-, while it increases rapidly at first and then decreases rapidly with the increasing dosage of Fe(NO3)3·9H2O. These results are different from that prepared with NaOH. It can be explained that solid K2FeO4 salts can be formed in KOH solution, and it will lower the Fe(Ⅵ) concentration, counteract the decomposition of Fe(Ⅵ), and improve the yield of Fe(Ⅵ). The maximum ferrate concentration is 0.163 mol/L obtained by 100 g/L Fe(NO3)3·9H2O and 6.16 mol/L KOH at 65 ℃. The stability of Fe(VI) is greatly improved due to the hypochlorite existed in the dissolved ferrate, and only 24% Fe(Ⅵ) has been decomposed after 16 d for 1 mmol/L Fe(Ⅵ) at 25 ℃.