氨-醇盐析法分离钾钠制备硫酸钾

摘要

Take the filtered leaching-liquid of the sinter of the potassium-rich rocks from Luonan,Shaanxi as the object of the study. By inlet CO2 gas, ammonia and sec-butanol were added into the liquid, then NaHCO3 and KHCO3 were separatod under the action of salting out to produce the agricultural potassium sulphate. Technology of separating Na - K mixed solution by ammonia - alcohol salting out method was studied. Experiment results indicatod that the mass fraction of separated KHCO3 was up to 95.29％ under the optimum process conditions. Sulfuric acid was added to the solution of KHCO3 to prepare potassium sulphate. Prepared K2SO4 reached the first-rate of National Agriculture Potassium Sulphate Standard.%以陕西省洛南县富钾岩石烧结物的水浸滤液为研究对象,在通入二氧化碳条件下加入氨水和仲丁醇,产生盐析作用,分离碳酸氢钠和碳酸氢钾,以制备农用硫酸钾.对氨-醇盐析法分离钾钠混合溶液的工艺进行了研究.实验结果表明,最佳工艺条件下,分离后得到的碳酸氢钾质量分数为95.29%,将其溶解并加入硫酸制得硫酸钾产品,产品达到了国家农业用硫酸钾优等品标准.