分解光卤石的分解液量对钾收率的影响研究  

Study on effect of the quantity of decomposition liquid on KCl recovery in process of carnallite cold-decomposition

作　　者：程芳琴[1] 张洪满[1] 严霞 刁祥瑞 

机构地区：[1]山西大学环境科学与工程研究中心,山西太原030006 [2]青海盐湖集团元通钾肥有限公司

出　　处：《无机盐工业》2008年第8期19-22,共4页Inorganic Chemicals Industry

基　　金：国家科技支撑计划(2006BAB09B02)

摘　　要：氯化钾是重要的钾肥品种,中国90%的氯化钾是由青海察尔汗盐湖利用分解光卤石的方法来生产,研究光卤石分解过程对提高氯化钾的收率具有重要意义。以氯化钠-氯化钾-氯化镁-水四元体系10℃相图为依据,研究光卤石冷分解过程中,分解液加入量对氯化钾收率的影响。研究结果表明,光卤石在自制的分解器中反应30 m in可以分解完全,氯化钾收率最高可达85%,分解液量每增加10%,粗钾中的氯化钾质量分数约提高1%,但氯化钾的收率约降低2.3%;通过对实验数据拟合得出分解液加入量与分解完成液中氯化钾溶解量的对数方程y=3.209+3.375 lnn,通过该方程可以控制分解液的加入量。研究光卤石分解中分解液加入量对钾收率的影响,可为工业化的生产过程提供技术支持。Potassium chloride is an important potassic fertilizer. In China,90% of KCl was produced by decomposing carnallite ,which comes from charhan salt lake in Qinghai. The study on the process of carnallite decomposition plays an important role in the increase of KCl recovery. In this paper, the effect of the quantity of decomposition liquid on potassium chloride recovery in the process of carnallite cold - composition was studied according to phase diagram of NaCl - KCl - MgCl2 - H20 quaternary system at 10℃. The research results showed that carnallite could absolutely dissolved in self - designed reactor within 30 min,the maximum yield could reach 85% ;the mass of decomposition liquid increased by 10% ,the mass fraction of KCl enhanced by 1% approximately, but its recovery rate decreased by 2.3% or so. For another, a logarithm function （γ = 3. 209 ＋ 3. 375 inn） between the quantity of decomposition liquid and the quantity of potassium chloride dissolved in solution has been obtained with statistical analysis method. The quantity of decomposition liquid can be controlled by that function. This research can provide a technical support for industrialized production process.

关 键 词：光卤石 钾肥 氯化钾 

分 类 号：TQ131.13[化学工程—无机化工]