添加NaCl-CaCO_3混合助剂焙烧难溶性钾矿提取氯化钾的实验研究  

Experimental Study on Calcination of Sparingly Soluble K-bearing Ore with Composite Additive of NaCl and CaCO_3 for Potassium Chloride Extraction

作　　者：李小燕[1] 万夫伟[1] 陈昌华[1] 

机构地区：[1]天津水泥工业设计研究院有限公司,天津300400

出　　处：《硅酸盐通报》2017年第4期1442-1446,共5页Bulletin of the Chinese Ceramic Society

基　　金：2014年天津市科技支撑计划项目科技服务业重大专项(14ZCDZGX00826)

摘　　要：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CaCO_3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 Tl 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.

关 键 词：难溶性钾矿 钾长石 助剂 钾提取率 NACL CACO3 

分 类 号：TQ440.4[化学工程—化学肥料工业] TQ443.5