摘要
食品级氯化钾主要通过工业氯化钾除杂和重结晶获得,工艺复杂且能耗高。青海盐湖生产的工业氯化钾的特点是浮选药剂残留和重金属超标,其中十八胺和铅的质量分数分别为1.69×10^(-4)和1.63×10^(-5)。以牛骨为原料,采用磷酸活化、煅烧工艺制得比表面积为113.15m^(2)/g的活性生物牛骨炭,并采用活性生物牛骨炭一步吸附法除去盐湖工业氯化钾中的十八胺和铅。当向1 L工业氯化钾饱和溶液中投加10 g活性生物牛骨炭进行纯化时,纯化后的氯化钾中未测出十八胺和铅,产品指标达到了食品级氯化钾的质量标准。
Food grade potassium chloride is usually produced by removing impurities from industrial potassium chloride followed by re-crystallization.It presents high energy consumption and employs complicated process.The concentration of octadecylamine as a residual flotation reagent and lead as an excessive heavy metal contained in the industrial potassium chloride manufactured in Qinghai Salt Lake were 1.69×10^(-4) and 1.63×10^(-5) respectively.The bioactive cattle bone char with specific surface area of 113.15 m2/g was prepared by activation of cattle bone based on phospho-ric acid.Ammonium and lead in industrial grade potassium chloride from salt lake were able to be removed by one-step adsorption process with the bioactive cattle bone char to prepare food grade potassium chloride.With the bioactive cattle bone char consumption of 10 g/L(for treating saturated solution of industrial potassium chloride),analysis results indicated there was no octadecylamine and lead contained in the purified potassium chloride product which comply with the standards for food grade potassium chloride.
作者
李海朝
梁天
廖微言
张净净
Li Haichao;Liang Tian;Liao Weiyan;Zhang Jingjing(Qinghai Nationalities University,Key Laboratory of Resource Chemistry and Eco-environmental Protection for Qinghai-Tibet Plateau,Xining Qinghai 810007,China)
出处
《化工矿物与加工》
CAS
2021年第7期42-44,共3页
Industrial Minerals & Processing
基金
青海省自然科学基金(2019-ZJ-928)。
关键词
工业氯化钾
食品级氯化钾
十八胺
重金属
纯化
活性炭
牛骨炭
盐湖
industrial grade potassium chloride
food grade potassium chloride
octadecylamine
heavy metal
purification
activated carbon
cattle bone char
salt lake
