摘要
工业磷石膏杂质含量高,白度较低,直接影响其应用。本文利用硫酸溶液处理磷石膏,通过单因素实验和正交实验对常压酸化工艺进行优化,得到常压酸化法的最佳工艺条件为:固液比1∶25、反应温度80℃、搅拌反应时间5min、硫酸溶液浓度3mol·L^-1,白度值由33.5%提高到79.0%,长径比为90.00,大大提高了磷石膏的白度,具有广泛的实际用途。
Industrial phosphogypsum had high impurity content and low whiteness,which directly affected its application.In this paper,phosphogypsum was treated with sulphuric acid solution.Through single factor experiment and orthogonal experiment the optimum process conditions of atmospheric acidification were obtained as followed:solid-liquid ratio was 1:25,reaction temperature was 80℃,stirring reaction time was 5 minutes,concentration of sulphuric acid solution was 3 mol/L,whiteness value increased from 33.5%to 79.0%,length-diameter ratio was 90.00.It greatly improved the whiteness of phosphogypsum and had a wide range of practical uses.
作者
刘义明
黄斌
LIU Yiming;HUANG Bin(Sichuan Hongda Co.Ltd,Deyang 618400,China;College of Chemical Engineering,Sichuan University of Science and Technology,Zigong 643000,China)
出处
《化工技术与开发》
CAS
2019年第11期65-67,76,共4页
Technology & Development of Chemical Industry
关键词
磷石膏
硫酸钙
净化增白
溶解
结晶
phosphogypsum
calcium sulfate
purification and whitening
dissolution
crystallization
