为综合利用我国难溶性钾矿提取氯化钾,采用石盐和石灰石作为焙烧难溶性钾矿的混合助剂,研究了钠钾摩尔比、石灰石加入量、焙烧温度与时间、钾钠挥发等因素对钾提取率的影响.钠钾摩尔比为4,石灰石加入量为12.5wt%的配料在900 ℃焙烧90 min的条件下,混合助剂实现了钾提取率84.6%.通过X射线衍射仪(XRD)对焙烧产物水浸后的滤渣进行了矿物组成分析,探讨了NaCl和CaCO3作为混合助剂分解钾长石的机理.石盐和石灰石组成的混合助剂与难溶性钾矿的质量比为0.73,与其它体系相比,助剂用量大大降低.
To better make use of sparingly soluble K-bearing ore and extract potassium chloride, halite and limestone were chosen as the composite additive for the calcination of sparingly soluble K-bearing ore.The influence of Na/K mol ratio, calcination temperature and time, limestone amount, volatility of K and Na on the potassium extraction rate was investigated.K extraction rate of 84.6% is obtained for the sample with Na/K mol ratio of 4 and limestone amount of 12.5wt%, calcined at 900 ℃ for 90 min.The phase analysis of the filter slag from leaching the calcined product was analyzed by XRD and the mechanism of NaCl and CaCO3 for the decomposition of potassium feldspar was discussed.The mass ratio of the NaCl-CaCO3 composite additive to sparingly soluble K-bearing ore is 0.73.Compared with other systems, the additive amount is largely reduced.
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